1 #if 0
2 CHANGES - changes for libpng
3
4 version 0.1 [March 29, 1995]
5 initial work-in-progress release
6
7 version 0.2 [April 1, 1995]
8 added reader into png.h
9 fixed small problems in stub file
10
11 version 0.3 [April 8, 1995]
12 added pull reader
13 split up pngwrite.c to several files
14 added pnglib.txt
15 added example.c
16 cleaned up writer, adding a few new transformations
17 fixed some bugs in writer
18 interfaced with zlib 0.5
19 added K&R support
20 added check for 64 KB blocks for 16 bit machines
21
22 version 0.4 [April 26, 1995]
23 cleaned up code and commented code
24 simplified time handling into png_time
25 created png_color_16 and png_color_8 to handle color needs
26 cleaned up color type defines
27 fixed various bugs
28 made various names more consistent
29 interfaced with zlib 0.71
30 cleaned up zTXt reader and writer (using zlib's Reset functions)
31 split transformations into pngrtran.c and pngwtran.c
32
33 version 0.5 [April 30, 1995]
34 interfaced with zlib 0.8
35 fixed many reading and writing bugs
36 saved using 3 spaces instead of tabs
37
38 version 0.6 [May 1, 1995]
39 first beta release
40 added png_large_malloc() and png_large_free()
41 added png_size_t
42 cleaned up some compiler warnings
43 added png_start_read_image()
44
45 version 0.7 [June 24, 1995]
46 cleaned up lots of bugs
47 finished dithering and other stuff
48 added test program
49 changed name from pnglib to libpng
50
51 version 0.71 [June 26, 1995]
52 changed pngtest.png for zlib 0.93
53 fixed error in libpng.txt and example.c
54
55 version 0.8 [August 20, 1995]
56 cleaned up some bugs
57 added png_set_filler()
58 split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
59 added #define's to remove unwanted code
60 moved png_info_init() to png.c
61 added old_size into png_realloc()
62 added functions to manually set filtering and compression info
63 changed compression parameters based on image type
64 optimized filter selection code
65 added version info
66 changed external functions passing floats to doubles (k&r problems?)
67 put all the configurable stuff in pngconf.h
68 enabled png_set_shift to work with paletted images on read
69 added png_read_update_info() - updates info structure with transformations
70
71 Version 0.81 [August, 1995]
72 incorporated Tim Wegner's medium model code (thanks, Tim)
73
74 Version 0.82 [September, 1995]
75 [unspecified changes]
76
77 Version 0.85 [December, 1995]
78 added more medium model code (almost everything's a far)
79 added i/o, error, and memory callback functions
80 fixed some bugs (16-bit, 4-bit interlaced, etc.)
81 added first run progressive reader (barely tested)
82
83 Version 0.86 [January, 1996]
84 fixed bugs
85 improved documentation
86
87 Version 0.87 [January, 1996]
88 fixed medium model bugs
89 fixed other bugs introduced in 0.85 and 0.86
90 added some minor documentation
91
92 Version 0.88 [January, 1996]
93 fixed progressive bugs
94 replaced tabs with spaces
95 cleaned up documentation
96 added callbacks for read/write and warning/error functions
97
98 Version 0.89 [June 5, 1996]
99 Added new initialization API to make libpng work better with shared libs
100 we now have png_create_read_struct(), png_create_write_struct(),
101 png_create_info_struct(), png_destroy_read_struct(), and
102 png_destroy_write_struct() instead of the separate calls to
103 malloc and png_read_init(), png_info_init(), and png_write_init()
104 Changed warning/error callback functions to fix bug - this means you
105 should use the new initialization API if you were using the old
106 png_set_message_fn() calls, and that the old API no longer exists
107 so that people are aware that they need to change their code
108 Changed filter selection API to allow selection of multiple filters
109 since it didn't work in previous versions of libpng anyways
110 Optimized filter selection code
111 Fixed png_set_background() to allow using an arbitrary RGB color for
112 paletted images
113 Fixed gamma and background correction for paletted images, so
114 png_correct_palette is not needed unless you are correcting an
115 external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
116 in pngconf.h) - if nobody uses this, it may disappear in the future.
117 Fixed bug with Borland 64K memory allocation (Alexander Lehmann)
118 Fixed bug in interlace handling (Smarasderagd, I think)
119 Added more error checking for writing and image to reduce invalid files
120 Separated read and write functions so that they won't both be linked
121 into a binary when only reading or writing functionality is used
122 New pngtest image also has interlacing and zTXt
123 Updated documentation to reflect new API
124
125 Version 0.89c [June 17, 1996]
126 Bug fixes.
127
128 Version 0.90 [January, 1997]
129 Made CRC errors/warnings on critical and ancillary chunks configurable
130 libpng will use the zlib CRC routines by (compile-time) default
131 Changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
132 Added external C++ wrapper statements to png.h (Gilles Dauphin)
133 Allow PNG file to be read when some or all of file signature has already
134 been read from the beginning of the stream. ****This affects the size
135 of info_struct and invalidates all programs that use a shared libpng****
136 Fixed png_filler() declarations
137 Fixed? background color conversions
138 Fixed order of error function pointers to match documentation
139 Current chunk name is now available in png_struct to reduce the number
140 of nearly identical error messages (will simplify multi-lingual
141 support when available)
142 Try to get ready for unknown-chunk callback functions:
143 - previously read critical chunks are flagged, so the chunk handling
144 routines can determine if the chunk is in the right place
145 - all chunk handling routines have the same prototypes, so we will
146 be able to handle all chunks via a callback mechanism
147 Try to fix Linux "setjmp" buffer size problems
148 Removed png_large_malloc, png_large_free, and png_realloc functions.
149
150 Version 0.95 [March, 1997]
151 Fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
152 Fixed bug in PNG file signature compares when start != 0
153 Changed parameter type of png_set_filler(...filler...) from png_byte
154 to png_uint_32
155 Added test for MACOS to ensure that both math.h and fp.h are not #included
156 Added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
157 Added "packswap" transformation, which changes the endianness of
158 packed-pixel bytes (Kevin Bracey)
159 Added "strip_alpha" transformation, which removes the alpha channel of
160 input images without using it (not necessarily a good idea)
161 Added "swap_alpha" transformation, which puts the alpha channel in front
162 of the color bytes instead of after
163 Removed all implicit variable tests which assume NULL == 0 (I think)
164 Changed several variables to "png_size_t" to show 16/32-bit limitations
165 Added new pCAL chunk read/write support
166 Added experimental filter selection weighting (Greg Roelofs)
167 Removed old png_set_rgbx() and png_set_xrgb() functions that have been
168 obsolete for about 2 years now (use png_set_filler() instead)
169 Added macros to read 16- and 32-bit ints directly from buffer, to be
170 used only on those systems that support it (namely PowerPC and 680x0)
171 With some testing, this may become the default for MACOS/PPC systems.
172 Only calculate CRC on data if we are going to use it
173 Added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
174 Added macros for simple libpng debugging output selectable at compile time
175 Removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
176 More description of info_struct in libpng.txt and png.h
177 More instructions in example.c
178 More chunk types tested in pngtest.c
179 Renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
180 png_set_<chunk>. We now have corresponding png_get_<chunk>
181 functions in pngget.c to get information in info_ptr. This isolates
182 the application from the internal organization of png_info_struct
183 (good for shared library implementations).
184
185 Version 0.96 [May, 1997]
186 Fixed serious bug with < 8bpp images introduced in 0.95
187 Fixed 256-color transparency bug (Greg Roelofs)
188 Fixed up documentation (Greg Roelofs, Laszlo Nyul)
189 Fixed "error" in pngconf.h for Linux setjmp() behavior
190 Fixed DOS medium model support (Tim Wegner)
191 Fixed png_check_keyword() for case with error in static string text
192 Added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
193 Added typecasts to quiet compiler errors
194 Added more debugging info
195
196 Version 0.97 [January, 1998]
197 Removed PNG_USE_OWN_CRC capability
198 Relocated png_set_crc_action from pngrutil.c to pngrtran.c
199 Fixed typecasts of "new_key", etc. (Andreas Dilger)
200 Added RFC 1152 [sic] date support
201 Fixed bug in gamma handling of 4-bit grayscale
202 Added 2-bit grayscale gamma handling (Glenn R-P)
203 Added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
204 Minor corrections in libpng.txt
205 Added simple sRGB support (Glenn R-P)
206 Easier conditional compiling, e.g.,
207 define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
208 all configurable options can be selected from command-line instead
209 of having to edit pngconf.h (Glenn R-P)
210 Fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
211 Added more conditions for png_do_background, to avoid changing
212 black pixels to background when a background is supplied and
213 no pixels are transparent
214 Repaired PNG_NO_STDIO behavior
215 Tested NODIV support and made it default behavior (Greg Roelofs)
216 Added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
217 Regularized version numbering scheme and bumped shared-library major
218 version number to 2 to avoid problems with libpng 0.89 apps
219 (Greg Roelofs)
220
221 Version 0.98 [January, 1998]
222 Cleaned up some typos in libpng.txt and in code documentation
223 Fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
224 Cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
225 Changed recommendation about file_gamma for PC images to .51 from .45,
226 in example.c and libpng.txt, added comments to distinguish between
227 screen_gamma, viewing_gamma, and display_gamma.
228 Changed all references to RFC1152 to read RFC1123 and changed the
229 PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
230 Added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
231 Changed srgb_intent from png_byte to int to avoid compiler bugs
232
233 Version 0.99 [January 30, 1998]
234 Free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
235 Fixed a longstanding "packswap" bug in pngtrans.c
236 Fixed some inconsistencies in pngconf.h that prevented compiling with
237 PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
238 Fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
239 Changed recommendation about file_gamma for PC images to .50 from .51 in
240 example.c and libpng.txt, and changed file_gamma for sRGB images to .45
241 Added a number of functions to access information from the png structure
242 png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
243 Added TARGET_MACOS similar to zlib-1.0.8
244 Define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
245 Added type casting to all png_malloc() function calls
246
247 Version 0.99a [January 31, 1998]
248 Added type casts and parentheses to all returns that return a value.(Tim W.)
249
250 Version 0.99b [February 4, 1998]
251 Added type cast png_uint_32 on malloc function calls where needed.
252 Changed type of num_hist from png_uint_32 to int (same as num_palette).
253 Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
254 Renamed makefile.elf to makefile.lnx.
255
256 Version 0.99c [February 7, 1998]
257 More type casting. Removed erroneous overflow test in pngmem.c.
258 Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
259 Added UNIX manual pages libpng.3 (incorporating libpng.txt) and png.5.
260
261 Version 0.99d [February 11, 1998]
262 Renamed "far_to_near()" "png_far_to_near()"
263 Revised libpng.3
264 Version 99c "buffered" operations didn't work as intended. Replaced them
265 with png_memcpy_check() and png_memset_check().
266 Added many "if (png_ptr == NULL) return" to quell compiler warnings about
267 unused png_ptr, mostly in pngget.c and pngset.c.
268 Check for overlength tRNS chunk present when indexed-color PLTE is read.
269 Cleaned up spelling errors in libpng.3/libpng.txt
270 Corrected a problem with png_get_tRNS() which returned undefined trans array
271
272 Version 0.99e [February 28, 1998]
273 Corrected png_get_tRNS() again.
274 Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
275 Touched up example.c to make more of it compileable, although the entire
276 file still can't be compiled (Willem van Schaik)
277 Fixed a bug in png_do_shift() (Bryan Tsai)
278 Added a space in png.h prototype for png_write_chunk_start()
279 Replaced pngtest.png with one created with zlib 1.1.1
280 Changed pngtest to report PASS even when file size is different (Jean-loup G.)
281 Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
282
283 Version 0.99f [March 5, 1998]
284 Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
285 Moved makefiles into a "scripts" directory, and added INSTALL instruction file
286 Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
287 Added pointers to "note on libpng versions" in makefile.lnx and README
288 Added row callback feature when reading and writing nonprogressive rows
289 and added a test of this feature in pngtest.c
290 Added user transform callbacks, with test of the feature in pngtest.c
291
292 Version 0.99g [March 6, 1998, morning]
293 Minor changes to pngtest.c to suppress compiler warnings.
294 Removed "beta" language from documentation.
295
296 Version 0.99h [March 6, 1998, evening]
297 Minor changes to previous minor changes to pngtest.c
298 Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
299 and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
300 Added user transform capability
301
302 Version 1.00 [March 7, 1998]
303 Changed several typedefs in pngrutil.c
304 Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
305 Replaced "while(1)" with "for(;;)"
306 Added PNGARG() to prototypes in pngtest.c and removed some prototypes
307 Updated some of the makefiles (Tom Lane)
308 Changed some typedefs (s_start, etc.) in pngrutil.c
309 Fixed dimensions of "short_months" array in pngwrite.c
310 Replaced ansi2knr.c with the one from jpeg-v6
311
312 Version 1.0.0 [March 8, 1998]
313 Changed name from 1.00 to 1.0.0 (Adam Costello)
314 Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
315
316 Version 1.0.0a [March 9, 1998]
317 Fixed three bugs in pngrtran.c to make gamma+background handling consistent
318 (Greg Roelofs)
319 Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
320 for major, minor, and bugfix releases. This is 10001. (Adam Costello,
321 Tom Lane)
322 Make months range from 1-12 in png_convert_to_rfc1123
323
324 Version 1.0.0b [March 13, 1998]
325 Quieted compiler complaints about two empty "for" loops in pngrutil.c
326 Minor changes to makefile.s2x
327 Removed #ifdef/#endif around a png_free() in pngread.c
328
329 Version 1.0.1 [March 14, 1998]
330 Changed makefile.s2x to reduce security risk of using a relative pathname
331 Fixed some typos in the documentation (Greg).
332 Fixed a problem with value of "channels" returned by png_read_update_info()
333
334 Version 1.0.1a [April 21, 1998]
335 Optimized Paeth calculations by replacing abs() function calls with intrinsics
336 plus other loop optimizations. Improves avg decoding speed by about 20%.
337 Commented out i386istic "align" compiler flags in makefile.lnx.
338 Reduced the default warning level in some makefiles, to make them consistent.
339 Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
340 Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
341 Added grayscale and 16-bit capability to png_do_read_filler().
342 Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
343 too large when writing an image with bit_depth < 8 (Bob Dellaca).
344 Corrected some bugs in the experimental weighted filtering heuristics.
345 Moved a misplaced pngrutil code block that truncates tRNS if it has more
346 than num_palette entries -- test was done before num_palette was defined.
347 Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
348 Changed compiler flags in makefile.wat for better optimization
349 (Pawel Mrochen).
350
351 Version 1.0.1b [May 2, 1998]
352 Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
353 Relocated the png_composite macros from pngrtran.c to png.h (Greg).
354 Added makefile.sco (contributed by Mike Hopkirk).
355 Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
356 Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
357 More work on the Paeth-filtering, achieving imperceptible speedup
358 (A Kleinert).
359 More work on loop optimization which may help when compiled with C++
360 compilers.
361 Added warnings when people try to use transforms they've defined out.
362 Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
363 Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
364
365 Version 1.0.1c [May 11, 1998]
366 Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
367 filler bytes should have been 0xff instead of 0xf.
368 Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
369 Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
370 out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
371 Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
372 for consistency, in pngconf.h
373 Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
374 to remove unwanted capabilities via the compile line
375 Made some corrections to grammar (which, it's) in documentation (Greg).
376 Corrected example.c, use of row_pointers in png_write_image().
377
378 Version 1.0.1d [May 24, 1998]
379 Corrected several statements that used side effects illegally in pngrutil.c
380 and pngtrans.c, that were introduced in version 1.0.1b
381 Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
382 More corrections to example.c, use of row_pointers in png_write_image()
383 and png_read_rows().
384 Added pngdll.mak and pngdef.pas to scripts directory, contributed by
385 Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
386 Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
387 Changed several loops from count-down to count-up, for consistency.
388
389 Version 1.0.1e [June 6, 1998]
390 Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
391 added warnings when people try to set png_read_fn and png_write_fn in
392 the same structure.
393 Added a test such that png_do_gamma will be done when num_trans==0
394 for truecolor images that have defined a background. This corrects an
395 error that was introduced in libpng-0.90 that can cause gamma processing
396 to be skipped.
397 Added tests in png.h to include "trans" and "trans_values" in structures
398 when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.
399 Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
400 Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
401 Added capability for user-provided malloc_fn() and free_fn() functions,
402 and revised pngtest.c to demonstrate their use, replacing the
403 PNGTEST_DEBUG_MEM feature.
404 Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
405
406 Version 1.0.2 [June 14, 1998]
407 Fixed two bugs in makefile.bor .
408
409 Version 1.0.2a [December 30, 1998]
410 Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
411 Fixed a bug in png_do_filler() that made it fail to write filler bytes in
412 the left-most pixel of each row (Kevin Bracey).
413 Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
414 in pngtest.c (Duncan Simpson).
415 Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
416 even when no tIME chunk was present in the source file.
417 Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
418 Fixed a problem in png_read_push_finish_row(), which would not skip some
419 passes that it should skip, for images that are less than 3 pixels high.
420 Interchanged the order of calls to png_do_swap() and png_do_shift()
421 in pngwtran.c (John Cromer).
422 Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
423 Changed "bad adaptive filter type" from error to warning in pngrutil.c .
424 Fixed a documentation error about default filtering with 8-bit indexed-color.
425 Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
426 (L. Peter Deutsch).
427 Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
428 Added png_get_copyright() and png_get_header_version() functions.
429 Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
430 Added information about debugging in libpng.txt and libpng.3 .
431 Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and
432 makefile.sco.
433 Removed lines after Dynamic Dependencies" in makefile.aco .
434 Revised makefile.dec to make a shared library (Jeremie Petit).
435 Removed trailing blanks from all files.
436
437 Version 1.0.2a [January 6, 1999]
438 Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
439 Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
440 Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
441 Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
442 which is obsolete.
443
444 Version 1.0.3 [January 14, 1999]
445 Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
446 Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
447
448 Version 1.0.3a [August 12, 1999]
449 Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
450 if an attempt is made to read an interlaced image when it's not supported.
451 Added check if png_ptr->trans is defined before freeing it in pngread.c
452 Modified the Y2K statement to include versions back to version 0.71
453 Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
454 Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
455 Replaced leading blanks with tab characters in makefile.hux
456 Changed "dworkin.wustl.edu" to "ccrc.wustl.edu" in various documents.
457 Changed (float)red and (float)green to (double)red, (double)green
458 in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.
459 Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).
460 Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).
461 Updated documentation to refer to the PNG-1.2 specification.
462 Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c
463 in makefile.knr, INSTALL, and README (L. Peter Deutsch)
464 Fixed bugs in calculation of the length of rowbytes when adding alpha
465 channels to 16-bit images, in pngrtran.c (Chris Nokleberg)
466 Added function png_set_user_transform_info() to store user_transform_ptr,
467 user_depth, and user_channels into the png_struct, and a function
468 png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)
469 Added function png_set_empty_plte_permitted() to make libpng useable
470 in MNG applications.
471 Corrected the typedef for png_free_ptr in png.h (Jesse Jones).
472 Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
473 consistent with PNG-1.2, and allow variance of 500 before complaining.
474 Added assembler code contributed by Intel in file pngvcrd.c and modified
475 makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation,
476 Gilles Vollant)
477 Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
478 Added some aliases for png_set_expand() in pngrtran.c, namely
479 png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
480 (Greg Roelofs, in "PNG: The Definitive Guide").
481 Added makefile.beo for BEOS on X86, contributed by Sander Stok.
482
483 Version 1.0.3b [August 26, 1999]
484 Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
485 Changed leading blanks to tabs in all makefiles.
486 Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
487 Made alternate versions of png_set_expand() in pngrtran.c, namely
488 png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha
489 (Greg Roelofs, in "PNG: The Definitive Guide"). Deleted the 1.0.3a aliases.
490 Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h
491 Revised calculation of num_blocks in pngmem.c to avoid a potentially
492 negative shift distance, whose results are undefined in the C language.
493 Added a check in pngset.c to prevent writing multiple tIME chunks.
494 Added a check in pngwrite.c to detect invalid small window_bits sizes.
495
496 Version 1.0.3d [September 4, 1999]
497 Fixed type casting of igamma in pngrutil.c
498 Added new png_expand functions to scripts/pngdef.pas and pngos2.def
499 Added a demo read_user_transform_fn that examines the row filters in pngtest.c
500
501 Version 1.0.4 [September 24, 1999, not distributed publicly]
502 Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
503 Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
504 Made several minor corrections to pngtest.c
505 Renamed the makefiles with longer but more user friendly extensions.
506 Copied the PNG copyright and license to a separate LICENSE file.
507 Revised documentation, png.h, and example.c to remove reference to
508 "viewing_gamma" which no longer appears in the PNG specification.
509 Revised pngvcrd.c to use MMX code for interlacing only on the final pass.
510 Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a
511 Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX
512 assembler code) and makefile.vcwin32 (doesn't).
513 Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
514 Added a copy of pngnow.png to the distribution.
515
516 Version 1.0.4a [September 25, 1999]
517 Increase max_pixel_depth in pngrutil.c if a user transform needs it.
518 Changed several division operations to right-shifts in pngvcrd.c
519
520 Version 1.0.4b [September 30, 1999]
521 Added parentheses in line 3732 of pngvcrd.c
522 Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
523
524 Version 1.0.4c [October 1, 1999]
525 Added a "png_check_version" function in png.c and pngtest.c that will generate
526 a helpful compiler error if an old png.h is found in the search path.
527 Changed type of png_user_transform_depth|channels from int to png_byte.
528 Added "Libpng is OSI Certified Open Source Software" statement to png.h
529
530 Version 1.0.4d [October 6, 1999]
531 Changed 0.45 to 0.45455 in png_set_sRGB()
532 Removed unused PLTE entries from pngnow.png
533 Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
534
535 Version 1.0.4e [October 10, 1999]
536 Fixed sign error in pngvcrd.c (Greg Roelofs)
537 Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
538
539 Version 1.0.4f [October 15, 1999]
540 Surrounded example.c code with #if 0 .. #endif to prevent people from
541 inadvertently trying to compile it.
542 Changed png_get_header_version() from a function to a macro in png.h
543 Added type casting mostly in pngrtran.c and pngwtran.c
544 Removed some pointless "ptr = NULL" in pngmem.c
545 Added a "contrib" directory containing the source code from Greg's book.
546
547 Version 1.0.5 [October 15, 1999]
548 Minor editing of the INSTALL and README files.
549
550 Version 1.0.5a [October 23, 1999]
551 Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
552 Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
553 Further optimization and bugfix of pngvcrd.c
554 Revised pngset.c so that it does not allocate or free memory in the user's
555 text_ptr structure. Instead, it makes its own copy.
556 Created separate write_end_info_struct in pngtest.c for a more severe test.
557 Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
558
559 Version 1.0.5b [November 23, 1999]
560 Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
561 PNG_FLAG_WROTE_tIME from flags to mode.
562 Added png_write_info_before_PLTE() function.
563 Fixed some typecasting in contrib/gregbook/*.c
564 Updated scripts/makevms.com and added makevms.com to contrib/gregbook
565 and contrib/pngminus (Martin Zinser)
566
567 Version 1.0.5c [November 26, 1999]
568 Moved png_get_header_version from png.h to png.c, to accommodate ansi2knr.
569 Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
570 accommodate making DLL's: Moved usr_png_ver from global variable to function
571 png_get_header_ver() in png.c. Moved png_sig to png_sig_bytes in png.c and
572 eliminated use of png_sig in pngwutil.c. Moved the various png_CHNK arrays
573 into pngtypes.h. Eliminated use of global png_pass arrays. Declared the
574 png_CHNK and png_pass arrays to be "const". Made the global arrays
575 available to applications (although none are used in libpng itself) when
576 PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
577 Removed some extraneous "-I" from contrib/pngminus/makefile.std
578 Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
579 Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
580
581 Version 1.0.5d [November 29, 1999]
582 Add type cast (png_const_charp) two places in png.c
583 Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
584 Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
585 to applications a macro "PNG_USE_LOCAL_ARRAYS".
586 comment out (with #ifdef) all the new declarations when
587 PNG_USE_GLOBAL_ARRAYS is defined.
588 Added PNG_EXPORT_VAR macro to accommodate making DLL's.
589
590 Version 1.0.5e [November 30, 1999]
591 Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
592 structure; refactored the inflate/deflate support to make adding new chunks
593 with trailing compressed parts easier in the future, and added new functions
594 png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
595 png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
596 NOTE: Applications that write text chunks MUST define png_text->lang
597 before calling png_set_text(). It must be set to NULL if you want to
598 write tEXt or zTXt chunks. If you want your application to be able to
599 run with older versions of libpng, use
600
601 #ifdef PNG_iTXt_SUPPORTED
602 png_text[i].lang = NULL;
603 #endif
604
605 Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
606 offsets (Eric S. Raymond).
607 Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
608 PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
609 macros, leaving the separate macros also available.
610 Removed comments on #endifs at the end of many short, non-nested #if-blocks.
611
612 Version 1.0.5f [December 6, 1999]
613 Changed makefile.solaris to issue a warning about potential problems when
614 the ucb "ld" is in the path ahead of the ccs "ld".
615 Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
616 Added sCAL chunk support (Eric S. Raymond).
617
618 Version 1.0.5g [December 7, 1999]
619 Fixed "png_free_spallettes" typo in png.h
620 Added code to handle new chunks in pngpread.c
621 Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
622 Added "translated_key" to png_text structure and png_write_iTXt().
623 Added code in pngwrite.c to work around a newly discovered zlib bug.
624
625 Version 1.0.5h [December 10, 1999]
626 NOTE: regarding the note for version 1.0.5e, the following must also
627 be included in your code:
628 png_text[i].translated_key = NULL;
629 Unknown chunk handling is now supported.
630 Option to eliminate all floating point support was added. Some new
631 fixed-point functions such as png_set_gAMA_fixed() were added.
632 Expanded tabs and removed trailing blanks in source files.
633
634 Version 1.0.5i [December 13, 1999]
635 Added some type casts to silence compiler warnings.
636 Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
637 Removed leading blanks from a #define in pngvcrd.c
638 Added some parameters to the new png_set_keep_unknown_chunks() function.
639 Added a test for up->location != 0 in the first instance of writing
640 unknown chunks in pngwrite.c
641 Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
642 prevent recursion.
643 Added png_free_hIST() function.
644 Various patches to fix bugs in the sCAL and integer cHRM processing,
645 and to add some convenience macros for use with sCAL.
646
647 Version 1.0.5j [December 21, 1999]
648 Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
649 around buggy compilers.
650 Added new type "png_fixed_point" for integers that hold float*100000 values
651 Restored backward compatibility of tEXt/zTXt chunk processing:
652 Restored the first four members of png_text to the same order as v.1.0.5d.
653 Added members "lang_key" and "itxt_length" to png_text struct. Set
654 text_length=0 when "text" contains iTXt data. Use the "compression"
655 member to distinguish among tEXt/zTXt/iTXt types. Added
656 PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
657 The "Note" above, about backward incompatibility of libpng-1.0.5e, no
658 longer applies.
659 Fixed png_read|write_iTXt() to read|write parameters in the right order,
660 and to write the iTXt chunk after IDAT if it appears in the end_ptr.
661 Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
662 Reversed the order of trying to write floating-point and fixed-point gAMA.
663
664 Version 1.0.5k [December 27, 1999]
665 Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
666 Added png_handle_as_unknown() function (Glenn)
667 Added png_free_chunk_list() function and chunk_list and num_chunk_list members
668 of png_ptr.
669 Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
670 Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
671 about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
672 Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
673 Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
674 Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
675
676 Version 1.0.5l [January 1, 2000]
677 Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
678 for setting a callback function to handle unknown chunks and for
679 retrieving the associated user pointer (Glenn).
680
681 Version 1.0.5m [January 7, 2000]
682 Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
683
684 Version 1.0.5n [January 9, 2000]
685 Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
686 own memory for info_ptr->palette. This makes it safe for the calling
687 application to free its copy of the palette any time after it calls
688 png_set_PLTE().
689
690 Version 1.0.5o [January 20, 2000]
691 Cosmetic changes only (removed some trailing blanks and TABs)
692
693 Version 1.0.5p [January 31, 2000]
694 Renamed pngdll.mak to makefile.bd32
695 Cosmetic changes in pngtest.c
696
697 Version 1.0.5q [February 5, 2000]
698 Relocated the makefile.solaris warning about PATH problems.
699 Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
700 Revised makefile.gcmmx
701 Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
702
703 Version 1.0.5r [February 7, 2000]
704 Removed superfluous prototype for png_get_itxt from png.h
705 Fixed a bug in pngrtran.c that improperly expanded the background color.
706 Return *num_text=0 from png_get_text() when appropriate, and fix documentation
707 of png_get_text() in libpng.txt/libpng.3.
708
709 Version 1.0.5s [February 18, 2000]
710 Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
711 new error handler that's planned for the next libpng release, and changed
712 example.c, pngtest.c, and contrib programs to use this macro.
713 Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
714 Fixed a bug in png_read_png() that caused it to fail to expand some images
715 that it should have expanded.
716 Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
717 in pngget.c
718 Changed the allocation of palette, history, and trans arrays back to
719 the version 1.0.5 method (linking instead of copying) which restores
720 backward compatibility with version 1.0.5. Added some remarks about
721 that in example.c. Added "free_me" member to info_ptr and png_ptr
722 and added png_free_data() function.
723 Updated makefile.linux and makefile.gccmmx to make directories conditionally.
724 Made cosmetic changes to pngasmrd.h
725 Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
726 Modified png_read_png() to allocate info_ptr->row_pointers only if it
727 hasn't already been allocated.
728
729 Version 1.0.5t [March 4, 2000]
730 Changed png_jmp_env() migration aiding macro to png_jmpbuf().
731 Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
732 Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
733 PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
734 Files in contrib/gregbook were revised to use png_jmpbuf() and to select
735 a 24-bit visual if one is available, and to allow abbreviated options.
736 Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
737 Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
738
739 Version 1.0.5u [March 5, 2000]
740 Simplified the code that detects old png.h in png.c and pngtest.c
741 Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
742 Increased precision of rgb_to_gray calculations from 8 to 15 bits and
743 added png_set_rgb_to_gray_fixed() function.
744 Added makefile.bc32 (32-bit Borland C++, C mode)
745
746 Version 1.0.5v [March 11, 2000]
747 Added some parentheses to the png_jmpbuf macro definition.
748 Updated references to the zlib home page, which has moved to freesoftware.com.
749 Corrected bugs in documentation regarding png_read_row() and png_write_row().
750 Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
751 Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
752 revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
753
754 Version 1.0.6 [March 20, 2000]
755 Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
756 Added makefile.sggcc (SGI IRIX with gcc)
757
758 Version 1.0.6d [April 7, 2000]
759 Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
760 Added data_length parameter to png_decompress_chunk() function
761 Revised documentation to remove reference to abandoned png_free_chnk functions
762 Fixed an error in png_rgb_to_gray_fixed()
763 Revised example.c, usage of png_destroy_write_struct().
764 Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
765 Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
766 Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
767
768 Version 1.0.6e [April 9, 2000]
769 Added png_data_freer() function.
770 In the code that checks for over-length tRNS chunks, added check of
771 info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
772 Minor revisions of libpng.txt/libpng.3.
773 Check for existing data and free it if the free_me flag is set, in png_set_*()
774 and png_handle_*().
775 Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
776 is defined.
777 Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
778 and mentioned the purposes of the two macros in libpng.txt/libpng.3.
779
780 Version 1.0.6f [April 14, 2000]
781 Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
782 Add checks in png_set_text() for NULL members of the input text structure.
783 Revised libpng.txt/libpng.3.
784 Removed superfluous prototype for png_set_iTXt from png.h
785 Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
786 Changed several png_errors about malformed ancillary chunks to png_warnings.
787
788 Version 1.0.6g [April 24, 2000]
789 Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
790 Relocated paragraph about png_set_background() in libpng.3/libpng.txt
791 and other revisions (Matthias Benckmann)
792 Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
793 png_ptr members to restore binary compatibility with libpng-1.0.5
794 (breaks compatibility with libpng-1.0.6).
795
796 Version 1.0.6h [April 24, 2000]
797 Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
798 libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
799 This is a temporary change for test purposes.
800
801 Version 1.0.6i [May 2, 2000]
802 Rearranged some members at the end of png_info and png_struct, to put
803 unknown_chunks_num and free_me within the original size of the png_structs
804 and free_me, png_read_user_fn, and png_free_fn within the original png_info,
805 because some old applications allocate the structs directly instead of
806 using png_create_*().
807 Added documentation of user memory functions in libpng.txt/libpng.3
808 Modified png_read_png so that it will use user_allocated row_pointers
809 if present, unless free_me directs that it be freed, and added description
810 of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
811 Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
812 1.00) members of png_struct and png_info, to regain binary compatibility
813 when you define this macro. Capabilities lost in this event
814 are user transforms (new in version 1.0.0),the user transform pointer
815 (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
816 the high-level interface, and unknown chunks support (all new in 1.0.6).
817 This was necessary because of old applications that allocate the structs
818 directly as authors were instructed to do in libpng-0.88 and earlier,
819 instead of using png_create_*().
820 Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
821 can be used to detect codes that directly allocate the structs, and
822 code to check these modes in png_read_init() and png_write_init() and
823 generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
824 was not defined.
825 Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
826
827 Version 1.0.6j [May 3, 2000]
828 Overloaded png_read_init() and png_write_init() with macros that convert
829 calls to png_read_init_2() or png_write_init_2() that check the version
830 and structure sizes.
831
832 Version 1.0.7beta11 [May 7, 2000]
833 Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
834 which are no longer used.
835 Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
836 defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED
837 is defined.
838 Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
839 overrun when old applications fill the info_ptr->text structure directly.
840 Added PNGAPI macro, and added it to the definitions of all exported functions.
841 Relocated version macro definitions ahead of the includes of zlib.h and
842 pngconf.h in png.h.
843
844 Version 1.0.7beta12 [May 12, 2000]
845 Revised pngset.c to avoid a problem with expanding the png_debug macro.
846 Deleted some extraneous defines from pngconf.h
847 Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
848 Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
849 Added png_access_version_number() function.
850 Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
851 Expanded libpng.3/libpng.txt information about png_data_freer().
852
853 Version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
854 Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
855 warnings instead of errors, as pngrutil.c does.
856 Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
857 will actually write IDATs.
858 Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
859 Make png_free_data() ignore its final parameter except when freeing data
860 that can have multiple instances (text, sPLT, unknowns).
861 Fixed a new bug in png_set_rows().
862 Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
863 Added png_set_invalid() function.
864 Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
865
866 Version 1.0.7beta15 [May 30, 2000]
867 Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
868 fewer error messages.
869 Rearranged checks for Z_OK to check the most likely path first in pngpread.c
870 and pngwutil.c.
871 Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
872 in libpng.txt/libpng.3 the need for applications to check this.
873 Changed names of png_default_*() functions in pngtest to pngtest_*().
874 Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
875 Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
876 Set each pointer to NULL after freeing it in png_free_data().
877 Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
878 macro that conflicts with libpng's png_color_16.index. (Dimitri
879 Papadapoulos)
880 Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
881
882 Version 1.0.7beta16 [June 4, 2000]
883 Revised the workaround of AIX string.h "index" bug.
884 Added a check for overlength PLTE chunk in pngrutil.c.
885 Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
886 indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
887 Added a warning in png_decompress_chunk() when it runs out of data, e.g.
888 when it tries to read an erroneous PhotoShop iCCP chunk.
889 Added PNG_USE_DLL macro.
890 Revised the copyright/disclaimer/license notice.
891 Added contrib/msvctest directory
892
893 Version 1.0.7rc1 [June 9, 2000]
894 Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200)
895 Added contrib/visupng directory (Willem van Schaik)
896
897 Version 1.0.7beta18 [June 23, 2000]
898 Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
899 and do not redefine PNGAPI if it is passed in via a compiler directive.
900 Revised visupng/PngFile.c to remove returns from within the Try block.
901 Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
902 Updated contrib/visupng/cexcept.h to version 1.0.0.
903 Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
904
905 Version 1.0.7rc2 [June 28, 2000]
906 Updated license to include disclaimers required by UCITA.
907 Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
908
909 Version 1.0.7 [July 1, 2000]
910 Revised the definition of "trans_values" in libpng.3/libpng.txt
911
912 Version 1.0.8beta1 [July 8, 2000]
913 Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
914 Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
915 pngwutil.c.
916 Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
917 Removed unused "#include <assert.h>" from png.c
918 Added WindowsCE support.
919 Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
920
921 Version 1.0.8beta2 [July 10, 2000]
922 Added project files to the wince directory and made further revisions
923 of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
924
925 Version 1.0.8beta3 [July 11, 2000]
926 Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
927 for indexed-color input files to avoid potential double-freeing trans array
928 under some unusual conditions; problem was introduced in version 1.0.6f.
929 Further revisions to pngtest.c and files in the wince subdirectory.
930
931 Version 1.0.8beta4 [July 14, 2000]
932 Added the files pngbar.png and pngbar.jpg to the distribution.
933 Added makefile.cygwin, and cygwin support in pngconf.h
934 Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
935
936 Version 1.0.8rc1 [July 16, 2000]
937 Revised png_debug() macros and statements to eliminate compiler warnings.
938
939 Version 1.0.8 [July 24, 2000]
940 Added png_flush() in pngwrite.c, after png_write_IEND().
941 Updated makefile.hpux to build a shared library.
942
943 Version 1.0.9beta1 [November 10, 2000]
944 Fixed typo in scripts/makefile.hpux
945 Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
946 Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
947 Changed "cdrom.com" in documentation to "libpng.org"
948 Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
949 Changed type of "params" from voidp to png_voidp in png_read|write_png().
950 Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
951 Revised the 3 instances of WRITEFILE in pngtest.c.
952 Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
953 Updated png.rc in dll/msvc project
954 Revised makefile.dec to define and use LIBPATH and INCPATH
955 Increased size of global png_libpng_ver[] array from 12 to 18 chars.
956 Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
957 Removed duplicate png_crc_finish() from png_handle_bKGD() function.
958 Added a warning when application calls png_read_update_info() multiple times.
959 Revised makefile.cygwin
960 Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
961 Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
962
963 Version 1.0.9beta2 [November 19, 2000]
964 Renamed the "dll" subdirectory "projects".
965 Added borland project files to "projects" subdirectory.
966 Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
967 Add error message in png_set_compression_buffer_size() when malloc fails.
968
969 Version 1.0.9beta3 [November 23, 2000]
970 Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
971 Removed the png_flush() in pngwrite.c that crashes some applications
972 that don't set png_output_flush_fn.
973 Added makefile.macosx and makefile.aix to scripts directory.
974
975 Version 1.0.9beta4 [December 1, 2000]
976 Change png_chunk_warning to png_warning in png_check_keyword().
977 Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
978
979 Version 1.0.9beta5 [December 15, 2000]
980 Added support for filter method 64 (for PNG datastreams embedded in MNG).
981
982 Version 1.0.9beta6 [December 18, 2000]
983 Revised png_set_filter() to accept filter method 64 when appropriate.
984 Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
985 help prevent applications from using MNG features in PNG datastreams.
986 Added png_permit_mng_features() function.
987 Revised libpng.3/libpng.txt. Changed "filter type" to "filter method".
988
989 Version 1.0.9rc1 [December 23, 2000]
990 Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
991 Fixed error handling of unknown compression type in png_decompress_chunk().
992 In pngconf.h, define __cdecl when _MSC_VER is defined.
993
994 Version 1.0.9beta7 [December 28, 2000]
995 Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
996 Revised memory management in png_set_hIST and png_handle_hIST in a backward
997 compatible manner. PLTE and tRNS were revised similarly.
998 Revised the iCCP chunk reader to ignore trailing garbage.
999
1000 Version 1.0.9beta8 [January 12, 2001]
1001 Moved pngasmrd.h into pngconf.h.
1002 Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
1003
1004 Version 1.0.9beta9 [January 15, 2001]
1005 Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
1006 wince and msvc project module definition files.
1007 Minor revision of makefile.cygwin.
1008 Fixed bug with progressive reading of narrow interlaced images in pngpread.c
1009
1010 Version 1.0.9beta10 [January 16, 2001]
1011 Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
1012 Fixed "png_mmx_supported" typo in project definition files.
1013
1014 Version 1.0.9beta11 [January 19, 2001]
1015 Updated makefile.sgi to make shared library.
1016 Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
1017 by default, for the benefit of DLL forward compatibility. These will
1018 be re-enabled in version 1.2.0.
1019
1020 Version 1.0.9rc2 [January 22, 2001]
1021 Revised cygwin support.
1022
1023 Version 1.0.9 [January 31, 2001]
1024 Added check of cygwin's ALL_STATIC in pngconf.h
1025 Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
1026
1027 Version 1.0.10beta1 [March 14, 2001]
1028 Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
1029 Reformatted libpng.3 to eliminate bad line breaks.
1030 Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
1031 Added prototype for png_mmx_support() near the top of pnggccrd.c
1032 Moved some error checking from png_handle_IHDR to png_set_IHDR.
1033 Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
1034 Revised png_mmx_support() function in pnggccrd.c
1035 Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
1036 Fixed memory leak in contrib/visupng/PngFile.c
1037 Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
1038 Added warnings when retrieving or setting gamma=0.
1039 Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
1040
1041 Version 1.0.10rc1 [March 23, 2001]
1042 Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
1043 and png_strlen.
1044 Revised png_mmx_supported() function in pnggccrd.c to return proper value.
1045 Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
1046
1047 Version 1.0.10 [March 30, 2001]
1048 Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
1049 Added beos project files (Chris Herborth)
1050
1051 Version 1.0.11beta1 [April 3, 2001]
1052 Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
1053 Removed a no-longer needed AIX work-around from pngconf.h
1054 Changed several "//" single-line comments to C-style in pnggccrd.c
1055
1056 Version 1.0.11beta2 [April 11, 2001]
1057 Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
1058 Updated scripts/pngos2.def
1059
1060 Version 1.0.11beta3 [April 14, 2001]
1061 Added checking the results of many instances of png_malloc() for NULL
1062
1063 Version 1.0.11beta4 [April 20, 2001]
1064 Undid the changes from version 1.0.11beta3. Added a check for NULL return
1065 from user's malloc_fn().
1066 Removed some useless type casts of the NULL pointer.
1067 Added makefile.netbsd
1068
1069 Version 1.0.11 [April 27, 2001]
1070 Revised makefile.netbsd
1071
1072 Version 1.0.12beta1 [May 14, 2001]
1073 Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
1074 Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
1075 Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
1076 Eliminated the png_error about apps using png_read|write_init(). Instead,
1077 libpng will reallocate the png_struct and info_struct if they are too small.
1078 This retains future binary compatibility for old applications written for
1079 libpng-0.88 and earlier.
1080
1081 Version 1.2.0beta1 [May 6, 2001]
1082 Bumped DLLNUM to 2.
1083 Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
1084 by default.
1085 Added runtime selection of MMX features.
1086 Added png_set_strip_error_numbers function and related macros.
1087
1088 Version 1.2.0beta2 [May 7, 2001]
1089 Finished merging 1.2.0beta1 with version 1.0.11
1090 Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
1091
1092 Version 1.2.0beta3 [May 17, 2001]
1093 Enabled user memory function by default.
1094 Modified png_create_struct so it passes user mem_ptr to user memory allocator.
1095 Increased png_mng_features flag from png_byte to png_uint_32.
1096 Bumped shared-library (so-number) and dll-number to 3.
1097
1098 Version 1.2.0beta4 [June 23, 2001]
1099 Check for missing profile length field in iCCP chunk and free chunk_data
1100 in case of truncated iCCP chunk.
1101 Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
1102 Bumped dll-number from 2 to 3 in makefile.cygwin
1103 Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
1104 if user attempts to run it on an 8-bit display.
1105 Updated contrib/gregbook
1106 Use png_malloc instead of png_zalloc to allocate palette in pngset.c
1107 Updated makefile.ibmc
1108 Added some typecasts to eliminate gcc 3.0 warnings. Changed prototypes
1109 of png_write_oFFS width and height from png_uint_32 to png_int_32.
1110 Updated example.c
1111 Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
1112
1113 Version 1.2.0beta5 [August 8, 2001]
1114 Revised contrib/gregbook
1115 Revised makefile.gcmmx
1116 Revised pnggccrd.c to conditionally compile some thread-unsafe code only
1117 when PNG_THREAD_UNSAFE_OK is defined.
1118 Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
1119 value exceeding 2^bit_depth-1
1120 Revised makefile.sgi and makefile.sggcc
1121 Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
1122 Removed restriction that do_invert_mono only operate on 1-bit opaque files
1123
1124 Version 1.2.0 [September 1, 2001]
1125 Changed a png_warning() to png_debug() in pnggccrd.c
1126 Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
1127
1128 Version 1.2.1beta1 [October 19, 2001]
1129 Revised makefile.std in contrib/pngminus
1130 Include background_1 in png_struct regardless of gamma support.
1131 Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
1132 Revised example.c to provide more details about using row_callback().
1133
1134 Version 1.2.1beta2 [October 25, 2001]
1135 Added type cast to each NULL appearing in a function call, except for
1136 WINCE functions.
1137 Added makefile.so9.
1138
1139 Version 1.2.1beta3 [October 27, 2001]
1140 Removed type casts from all NULLs.
1141 Simplified png_create_struct_2().
1142
1143 Version 1.2.1beta4 [November 7, 2001]
1144 Revised png_create_info_struct() and png_creat_struct_2().
1145 Added error message if png_write_info() was omitted.
1146 Type cast NULLs appearing in function calls when _NO_PROTO or
1147 PNG_TYPECAST_NULL is defined.
1148
1149 Version 1.2.1rc1 [November 24, 2001]
1150 Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
1151 is defined.
1152 Changed typecast of "size" argument to png_size_t in pngmem.c calls to
1153 the user malloc_fn, to agree with the prototype in png.h
1154 Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
1155 Updated makefile.sgi to recognize LIBPATH and INCPATH.
1156 Updated various makefiles so "make clean" does not remove previous major
1157 version of the shared library.
1158
1159 Version 1.2.1rc2 [December 4, 2001]
1160 Always allocate 256-entry internal palette, hist, and trans arrays, to
1161 avoid out-of-bounds memory reference caused by invalid PNG datastreams.
1162 Added a check for prefix_length > data_length in iCCP chunk handler.
1163
1164 Version 1.2.1 [December 7, 2001]
1165 None.
1166
1167 Version 1.2.2beta1 [February 22, 2002]
1168 Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
1169 Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
1170 libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
1171 Revised makefile.darwin to remove "-undefined suppress" option.
1172 Added checks for gamma and chromaticity values over 21474.83, which exceed
1173 the limit for PNG unsigned 32-bit integers when encoded.
1174 Revised calls to png_create_read_struct() and png_create_write_struct()
1175 for simpler debugging.
1176 Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
1177
1178 Version 1.2.2beta2 [February 23, 2002]
1179 Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
1180 Check for invalid image dimensions in png_get_IHDR.
1181 Added missing "fi;" in the install target of the SGI makefiles.
1182 Added install-static to all makefiles that make shared libraries.
1183 Always do gamma compensation when image is partially transparent.
1184
1185 Version 1.2.2beta3 [March 7, 2002]
1186 Compute background.gray and background_1.gray even when color_type is RGB
1187 in case image gets reduced to gray later.
1188 Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
1189 Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
1190 Removed unused png_write_destroy_info prototype from png.h
1191 Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
1192 Added install-shared target to all makefiles that make shared libraries.
1193 Stopped a double free of palette, hist, and trans when not using free_me.
1194 Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
1195
1196 Version 1.2.2beta4 [March 8, 2002]
1197 Compute background.gray and background_1.gray even when color_type is RGB
1198 in case image gets reduced to gray later (Jason Summers).
1199 Relocated a misplaced /bin/rm in the "install-shared" makefile targets
1200 Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
1201
1202 Version 1.2.2beta5 [March 26, 2002]
1203 Added missing PNGAPI to several function definitions.
1204 Check for invalid bit_depth or color_type in png_get_IHDR(), and
1205 check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
1206 Revised iTXt support to accept NULL for lang and lang_key.
1207 Compute gamma for color components of background even when color_type is gray.
1208 Changed "()" to "{}" in scripts/libpng.pc.in.
1209 Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
1210 Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
1211
1212 Version 1.2.2beta6 [March 31, 2002]
1213
1214 Version 1.0.13beta1 [March 31, 2002]
1215 Prevent png_zalloc() from trying to memset memory that it failed to acquire.
1216 Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
1217 Ensure that the right function (user or default) is used to free the
1218 png_struct after an error in png_create_read_struct_2().
1219
1220 Version 1.2.2rc1 [April 7, 2002]
1221
1222 Version 1.0.13rc1 [April 7, 2002]
1223 Save the ebx register in pnggccrd.c (Sami Farin)
1224 Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
1225 Updated makefiles to put headers in include/libpng and remove old include/*.h.
1226
1227 Version 1.2.2 [April 15, 2002]
1228
1229 Version 1.0.13 [April 15, 2002]
1230 Revised description of png_set_filter() in libpng.3/libpng.txt.
1231 Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
1232
1233 Version 1.0.13patch01 [April 17, 2002]
1234
1235 Version 1.2.2patch01 [April 17, 2002]
1236 Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and
1237 makefile.sggcc
1238 Fixed VER -> PNGVER typo in makefile.macosx and added install-static to
1239 install
1240 Added install: target to makefile.32sunu and makefile.64sunu
1241
1242 Version 1.0.13patch03 [April 18, 2002]
1243
1244 Version 1.2.2patch03 [April 18, 2002]
1245 Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
1246 subdirectory to libpngNN subdirectory without the full pathname.
1247 Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
1248
1249 Version 1.2.3rc1 [April 28, 2002]
1250 Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
1251 Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
1252 Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
1253 Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
1254 Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
1255 Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
1256 Revised makefile.darwin to make relative links without full pathname.
1257 Added setjmp() at the end of png_create_*_struct_2() in case user forgets
1258 to put one in their application.
1259 Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
1260 removed them from module definition files.
1261
1262 Version 1.2.3rc2 [May 1, 2002]
1263 Fixed bug in reporting number of channels in pngget.c and pngset.c,
1264 that was introduced in version 1.2.2beta5.
1265 Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
1266 png_default_flush(), and png_push_fill_buffer() and included them in
1267 module definition files.
1268 Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
1269
1270 Version 1.2.3rc3 [May 1, 2002]
1271 Revised prototype for png_default_flush()
1272 Remove old libpng.pc and libpngNN.pc before installing new ones.
1273
1274 Version 1.2.3rc4 [May 2, 2002]
1275 Typos in *.def files (png_default_read|write -> png_default_read|write_data)
1276 In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
1277 Added libpng-config and libpngNN-config and modified makefiles to install
1278 them.
1279 Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
1280 Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
1281
1282 Version 1.2.3rc5 [May 11, 2002]
1283 Changed "error" and "message" in prototypes to "error_message" and
1284 "warning_message" to avoid namespace conflict.
1285 Revised 15 makefiles to build libpng-config from libpng-config-*.in
1286 Once more restored png_zalloc and png_zfree to regular nonexported form.
1287 Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
1288 to nonexported form, but with PNGAPI, and removed them from module def
1289 files.
1290
1291 Version 1.2.3rc6 [May 14, 2002]
1292 Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
1293 Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
1294 Removed leftover libpng-config "sed" script from four makefiles.
1295 Revised libpng-config creating script in 16 makefiles.
1296
1297 Version 1.2.3 [May 22, 2002]
1298 Revised libpng-config target in makefile.cygwin.
1299 Removed description of png_set_mem_fn() from documentation.
1300 Revised makefile.freebsd.
1301 Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
1302 Revised projects/msvc/README.txt
1303 Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
1304
1305 Version 1.2.4beta1 [May 24, 2002]
1306 Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
1307 Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
1308 Added missing "\" before closing double quote in makefile.gcmmx.
1309 Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
1310 functions.
1311
1312 Version 1.2.4beta2 [June 25, 2002]
1313 Plugged memory leak of png_ptr->current_text (Matt Holgate).
1314 Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
1315 Added -soname to the loader flags in makefile.dec, makefile.sgi, and
1316 makefile.sggcc.
1317 Added "test-installed" target to makefile.linux, makefile.gcmmx,
1318 makefile.sgi, and makefile.sggcc.
1319
1320 Version 1.2.4beta3 [June 28, 2002]
1321 Plugged memory leak of row_buf in pngtest.c when there is a png_error().
1322 Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
1323 Added "test-installed" target to makefile.32sunu, makefile.64sunu,
1324 makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
1325 makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
1326
1327 Version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
1328 Added "test-installed" target to makefile.cygwin and makefile.sco.
1329 Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
1330
1331 Version 1.2.4 and 1.0.14 [July 8, 2002]
1332 Changed png_warning() to png_error() when width is too large to process.
1333
1334 Version 1.2.4patch01 [July 20, 2002]
1335 Revised makefile.cygwin to use DLL number 12 instead of 13.
1336
1337 Version 1.2.5beta1 [August 6, 2002]
1338 Added code to contrib/gregbook/readpng2.c to ignore unused chunks.
1339 Replaced toucan.png in contrib/gregbook (it has been corrupt since 1.0.11)
1340 Removed some stray *.o files from contrib/gregbook.
1341 Changed png_error() to png_warning() about "Too much data" in pngpread.c
1342 and about "Extra compressed data" in pngrutil.c.
1343 Prevent png_ptr->pass from exceeding 7 in png_push_finish_row().
1344 Updated makefile.hpgcc
1345 Updated png.c and pnggccrd.c handling of return from png_mmx_support()
1346
1347 Version 1.2.5beta2 [August 15, 2002]
1348 Only issue png_warning() about "Too much data" in pngpread.c when avail_in
1349 is nonzero.
1350 Updated makefiles to install a separate libpng.so.3 with its own rpath.
1351
1352 Version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002]
1353 Revised makefiles to not remove previous minor versions of shared libraries.
1354
1355 Version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002]
1356 Revised 13 makefiles to remove "-lz" and "-L$(ZLIBLIB)", etc., from shared
1357 library loader directive.
1358 Added missing "$OBJSDLL" line to makefile.gcmmx.
1359 Added missing "; fi" to makefile.32sunu.
1360
1361 Version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002]
1362 Revised libpng-config script.
1363
1364 Version 1.2.5 and 1.0.15 [October 3, 2002]
1365 Revised makefile.macosx, makefile.darwin, makefile.hpgcc, and makefile.hpux,
1366 and makefile.aix.
1367 Relocated two misplaced PNGAPI lines in pngtest.c
1368
1369 Version 1.2.6beta1 [October 22, 2002]
1370 Commented out warning about uninitialized mmx_support in pnggccrd.c.
1371 Changed "IBMCPP__" flag to "__IBMCPP__" in pngconf.h.
1372 Relocated two more misplaced PNGAPI lines in pngtest.c
1373 Fixed memory overrun bug in png_do_read_filler() with 16-bit datastreams,
1374 introduced in version 1.0.2.
1375 Revised makefile.macosx, makefile.dec, makefile.aix, and makefile.32sunu.
1376
1377 Version 1.2.6beta2 [November 1, 2002]
1378 Added libpng-config "--ldopts" output.
1379 Added "AR=ar" and "ARFLAGS=rc" and changed "ar rc" to "$(AR) $(ARFLAGS)"
1380 in makefiles.
1381
1382 Version 1.2.6beta3 [July 18, 2004]
1383 Reverted makefile changes from version 1.2.6beta2 and some of the changes
1384 from version 1.2.6beta1; these will be postponed until version 1.2.7.
1385 Version 1.2.6 is going to be a simple bugfix release.
1386 Changed the one instance of "ln -sf" to "ln -f -s" in each Sun makefile.
1387 Fixed potential overrun in pngerror.c by using strncpy instead of memcpy.
1388 Added "#!/bin/sh" at the top of configure, for recognition of the
1389 'x' flag under Cygwin (Cosmin).
1390 Optimized vacuous tests that silence compiler warnings, in png.c (Cosmin).
1391 Added support for PNG_USER_CONFIG, in pngconf.h (Cosmin).
1392 Fixed the special memory handler for Borland C under DOS, in pngmem.c
1393 (Cosmin).
1394 Removed some spurious assignments in pngrutil.c (Cosmin).
1395 Replaced 65536 with 65536L, and 0xffff with 0xffffL, to silence warnings
1396 on 16-bit platforms (Cosmin).
1397 Enclosed shift op expressions in parentheses, to silence warnings (Cosmin).
1398 Used proper type png_fixed_point, to avoid problems on 16-bit platforms,
1399 in png_handle_sRGB() (Cosmin).
1400 Added compression_type to png_struct, and optimized the window size
1401 inside the deflate stream (Cosmin).
1402 Fixed definition of isnonalpha(), in pngerror.c and pngrutil.c (Cosmin).
1403 Fixed handling of unknown chunks that come after IDAT (Cosmin).
1404 Allowed png_error() and png_warning() to work even if png_ptr == NULL
1405 (Cosmin).
1406 Replaced row_info->rowbytes with row_bytes in png_write_find_filter()
1407 (Cosmin).
1408 Fixed definition of PNG_LIBPNG_VER_DLLNUM (Simon-Pierre).
1409 Used PNG_LIBPNG_VER and PNG_LIBPNG_VER_STRING instead of the hardcoded
1410 values in png.c (Simon-Pierre, Cosmin).
1411 Initialized png_libpng_ver[] with PNG_LIBPNG_VER_STRING (Simon-Pierre).
1412 Replaced PNG_LIBPNG_VER_MAJOR with PNG_LIBPNG_VER_DLLNUM in png.rc
1413 (Simon-Pierre).
1414 Moved the definition of PNG_HEADER_VERSION_STRING near the definitions
1415 of the other PNG_LIBPNG_VER_... symbols in png.h (Cosmin).
1416 Relocated #ifndef PNGAPI guards in pngconf.h (Simon-Pierre, Cosmin).
1417 Updated scripts/makefile.vc(a)win32 (Cosmin).
1418 Updated the MSVC project (Simon-Pierre, Cosmin).
1419 Updated the Borland C++ Builder project (Cosmin).
1420 Avoided access to asm_flags in pngvcrd.c, if PNG_1_0_X is defined (Cosmin).
1421 Commented out warning about uninitialized mmx_support in pngvcrd.c (Cosmin).
1422 Removed scripts/makefile.bd32 and scripts/pngdef.pas (Cosmin).
1423 Added extra guard around inclusion of Turbo C memory headers, in pngconf.h
1424 (Cosmin).
1425 Renamed projects/msvc/ to projects/visualc6/, and projects/borland/ to
1426 projects/cbuilder5/ (Cosmin).
1427 Moved projects/visualc6/png32ms.def to scripts/pngw32.def,
1428 and projects/visualc6/png.rc to scripts/pngw32.rc (Cosmin).
1429 Added projects/visualc6/pngtest.dsp; removed contrib/msvctest/ (Cosmin).
1430 Changed line endings to DOS style in cbuilder5 and visualc6 files, even
1431 in the tar.* distributions (Cosmin).
1432 Updated contrib/visupng/VisualPng.dsp (Cosmin).
1433 Updated contrib/visupng/cexcept.h to version 2.0.0 (Cosmin).
1434 Added a separate distribution with "configure" and supporting files (Junichi).
1435
1436 Version 1.2.6beta4 [July 28, 2004]
1437 Added user ability to change png_size_t via a PNG_SIZE_T macro.
1438 Added png_sizeof() and png_convert_size() functions.
1439 Added PNG_SIZE_MAX (maximum value of a png_size_t variable.
1440 Added check in png_malloc_default() for (size_t)size != (png_uint_32)size
1441 which would indicate an overflow.
1442 Changed sPLT failure action from png_error to png_warning and abandon chunk.
1443 Changed sCAL and iCCP failures from png_error to png_warning and abandon.
1444 Added png_get_uint_31(png_ptr, buf) function.
1445 Added PNG_UINT_32_MAX macro.
1446 Renamed PNG_MAX_UINT to PNG_UINT_31_MAX.
1447 Made png_zalloc() issue a png_warning and return NULL on potential
1448 overflow.
1449 Turn on PNG_NO_ZALLOC_ZERO by default in version 1.2.x
1450 Revised "clobber list" in pnggccrd.c so it will compile under gcc-3.4.
1451 Revised Borland portion of png_malloc() to return NULL or issue
1452 png_error() according to setting of PNG_FLAG_MALLOC_NULL_MEM_OK.
1453 Added PNG_NO_SEQUENTIAL_READ_SUPPORTED macro to conditionally remove
1454 sequential read support.
1455 Added some "#if PNG_WRITE_SUPPORTED" blocks.
1456 Added #ifdef to remove some redundancy in png_malloc_default().
1457 Use png_malloc instead of png_zalloc to allocate the pallete.
1458
1459 Version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004]
1460 Fixed buffer overflow vulnerability (CVE-2004-0597) in png_handle_tRNS().
1461 Fixed NULL dereference vulnerability (CVE-2004-0598) in png_handle_iCCP().
1462 Fixed integer overflow vulnerability (CVE-2004-0599) in png_read_png().
1463 Fixed some harmless bugs in png_handle_sBIT, etc, that would cause
1464 duplicate chunk types to go undetected.
1465 Fixed some timestamps in the -config version
1466 Rearranged order of processing of color types in png_handle_tRNS().
1467 Added ROWBYTES macro to calculate rowbytes without integer overflow.
1468 Updated makefile.darwin and removed makefile.macosx from scripts directory.
1469 Imposed default one million column, one-million row limits on the image
1470 dimensions, and added png_set_user_limits() function to override them.
1471 Revised use of PNG_SET_USER_LIMITS_SUPPORTED macro.
1472 Fixed wrong cast of returns from png_get_user_width|height_max().
1473 Changed some "keep the compiler happy" from empty statements to returns,
1474 Revised libpng.txt to remove 1.2.x stuff from the 1.0.x distribution
1475
1476 Version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004]
1477 Revised makefile.darwin and makefile.solaris. Removed makefile.macosx.
1478 Revised pngtest's png_debug_malloc() to use png_malloc() instead of
1479 png_malloc_default() which is not supposed to be exported.
1480 Fixed off-by-one error in one of the conversions to PNG_ROWBYTES() in
1481 pngpread.c. Bug was introduced in 1.2.6rc1.
1482 Fixed bug in RGB to RGBX transformation introduced in 1.2.6rc1.
1483 Fixed old bug in RGB to Gray transformation.
1484 Fixed problem with 64-bit compilers by casting arguments to abs()
1485 to png_int_32.
1486 Changed "ln -sf" to "ln -f -s" in three makefiles (solaris, sco, so9).
1487 Changed "HANDLE_CHUNK_*" to "PNG_HANDLE_CHUNK_*" (Cosmin)
1488 Added "-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)" to 15 *NIX makefiles.
1489 Added code to update the row_info->colortype in png_do_read_filler() (MSB).
1490
1491 Version 1.0.16rc3 and 1.2.6rc3 [August 9, 2004]
1492 Eliminated use of "abs()" in testing cHRM and gAMA values, to avoid
1493 trouble with some 64-bit compilers. Created PNG_OUT_OF_RANGE() macro.
1494 Revised documentation of png_set_keep_unknown_chunks().
1495 Check handle_as_unknown status in pngpread.c, as in pngread.c previously.
1496 Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_INTERNAL section of png.h
1497 Added "rim" definitions for CONST4 and CONST6 in pnggccrd.c
1498
1499 Version 1.0.16rc4 and 1.2.6rc4 [August 10, 2004]
1500 Fixed mistake in pngtest.c introduced in 1.2.6rc2 (declaration of
1501 "pinfo" was out of place).
1502
1503 Version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004]
1504 Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_ASSEMBLER_CODE_SUPPORTED
1505 section of png.h where they were inadvertently placed in version rc3.
1506
1507 Version 1.2.6 and 1.0.16 [August 15, 2004]
1508 Revised pngtest so memory allocation testing is only done when PNG_DEBUG==1.
1509
1510 Version 1.2.7beta1 [August 26, 2004]
1511 Removed unused pngasmrd.h file.
1512 Removed references to uu.net for archived files. Added references to
1513 PNG Spec (second edition) and the PNG ISO/IEC Standard.
1514 Added "test-dd" target in 15 makefiles, to run pngtest in DESTDIR.
1515 Fixed bug with "optimized window size" in the IDAT datastream, that
1516 causes libpng to write PNG files with incorrect zlib header bytes.
1517
1518 Version 1.2.7beta2 [August 28, 2004]
1519 Fixed bug with sCAL chunk and big-endian machines (David Munro).
1520 Undid new code added in 1.2.6rc2 to update the color_type in
1521 png_set_filler().
1522 Added png_set_add_alpha() that updates color type.
1523
1524 Version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004]
1525 Revised png_set_strip_filler() to not remove alpha if color_type has alpha.
1526
1527 Version 1.2.7 and 1.0.17 [September 12, 2004]
1528 Added makefile.hp64
1529 Changed projects/msvc/png32ms.def to scripts/png32ms.def in makefile.cygwin
1530
1531 Version 1.2.8beta1 [November 1, 2004]
1532 Fixed bug in png_text_compress() that would fail to complete a large block.
1533 Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
1534 strip alpha operation in png_do_strip_filler().
1535 Added PNG_1_2_X definition in pngconf.h
1536 Use #ifdef to comment out png_info_init in png.c and png_read_init in
1537 pngread.c (as of 1.3.0)
1538
1539 Version 1.2.8beta2 [November 2, 2004]
1540 Reduce color_type to a nonalpha type after strip alpha operation in
1541 png_do_strip_filler().
1542
1543 Version 1.2.8beta3 [November 3, 2004]
1544 Revised definitions of PNG_MAX_UINT_32, PNG_MAX_SIZE, and PNG_MAXSUM
1545
1546 Version 1.2.8beta4 [November 12, 2004]
1547 Fixed (again) definition of PNG_LIBPNG_VER_DLLNUM in png.h (Cosmin).
1548 Added PNG_LIBPNG_BUILD_PRIVATE in png.h (Cosmin).
1549 Set png_ptr->zstream.data_type to Z_BINARY, to avoid unnecessary detection
1550 of data type in deflate (Cosmin).
1551 Deprecated but continue to support SPECIALBUILD and PRIVATEBUILD in favor of
1552 PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
1553
1554 Version 1.2.8beta5 [November 20, 2004]
1555 Use png_ptr->flags instead of png_ptr->transformations to pass
1556 PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
1557 compatibility.
1558 Revised handling of SPECIALBUILD, PRIVATEBUILD,
1559 PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
1560
1561 Version 1.2.8rc1 [November 24, 2004]
1562 Moved handling of BUILD macros from pngconf.h to png.h
1563 Added definition of PNG_LIBPNG_BASE_TYPE in png.h, inadvertently
1564 omitted from beta5.
1565 Revised scripts/pngw32.rc
1566 Despammed mailing addresses by masking "@" with "at".
1567 Inadvertently installed a supposedly faster test version of pngrutil.c
1568
1569 Version 1.2.8rc2 [November 26, 2004]
1570 Added two missing "\" in png.h
1571 Change tests in pngread.c and pngpread.c to
1572 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
1573 png_do_read_transformations(png_ptr);
1574
1575 Version 1.2.8rc3 [November 28, 2004]
1576 Reverted pngrutil.c to version libpng-1.2.8beta5.
1577 Added scripts/makefile.elf with supporting code in pngconf.h for symbol
1578 versioning (John Bowler).
1579
1580 Version 1.2.8rc4 [November 29, 2004]
1581 Added projects/visualc7 (Simon-pierre).
1582
1583 Version 1.2.8rc5 [November 29, 2004]
1584 Fixed new typo in scripts/pngw32.rc
1585
1586 Version 1.2.8 [December 3, 2004]
1587 Removed projects/visualc7, added projects/visualc71.
1588
1589 Version 1.2.9beta1 [February 21, 2006]
1590 Initialized some structure members in pngwutil.c to avoid gcc-4.0.0 complaints
1591 Revised man page and libpng.txt to make it clear that one should not call
1592 png_read_end or png_write_end after png_read_png or png_write_png.
1593 Updated references to png-mng-implement mailing list.
1594 Fixed an incorrect typecast in pngrutil.c
1595 Added PNG_NO_READ_SUPPORTED conditional for making a write-only library.
1596 Added PNG_NO_WRITE_INTERLACING_SUPPORTED conditional.
1597 Optimized alpha-inversion loops in pngwtran.c
1598 Moved test for nonzero gamma outside of png_build_gamma_table() in pngrtran.c
1599 Make sure num_trans is <= 256 before copying data in png_set_tRNS().
1600 Make sure num_palette is <= 256 before copying data in png_set_PLTE().
1601 Interchanged order of write_swap_alpha and write_invert_alpha transforms.
1602 Added parentheses in the definition of PNG_LIBPNG_BUILD_TYPE (Cosmin).
1603 Optimized zlib window flag (CINFO) in contrib/pngsuite/*.png (Cosmin).
1604 Updated scripts/makefile.bc32 for Borland C++ 5.6 (Cosmin).
1605 Exported png_get_uint_32, png_save_uint_32, png_get_uint_16, png_save_uint_16,
1606 png_get_int_32, png_save_int_32, png_get_uint_31 (Cosmin).
1607 Added type cast (png_byte) in png_write_sCAL() (Cosmin).
1608 Fixed scripts/makefile.cygwin (Christian Biesinger, Cosmin).
1609 Default iTXt support was inadvertently enabled.
1610
1611 Version 1.2.9beta2 [February 21, 2006]
1612 Check for png_rgb_to_gray and png_gray_to_rgb read transformations before
1613 checking for png_read_dither in pngrtran.c
1614 Revised checking of chromaticity limits to accommodate extended RGB
1615 colorspace (John Denker).
1616 Changed line endings in some of the project files to CRLF, even in the
1617 "Unix" tar distributions (Cosmin).
1618 Made png_get_int_32 and png_save_int_32 always available (Cosmin).
1619 Updated scripts/pngos2.def, scripts/pngw32.def and projects/wince/png32ce.def
1620 with the newly exported functions.
1621 Eliminated distributions without the "configure" script.
1622 Updated INSTALL instructions.
1623
1624 Version 1.2.9beta3 [February 24, 2006]
1625 Fixed CRCRLF line endings in contrib/visupng/VisualPng.dsp
1626 Made libpng.pc respect EXEC_PREFIX (D. P. Kreil, J. Bowler)
1627 Removed reference to pngasmrd.h from Makefile.am
1628 Renamed CHANGES to ChangeLog.
1629 Renamed LICENSE to COPYING.
1630 Renamed ANNOUNCE to NEWS.
1631 Created AUTHORS file.
1632
1633 Version 1.2.9beta4 [March 3, 2006]
1634 Changed definition of PKGCONFIG from $prefix/lib to $libdir in configure.ac
1635 Reverted to filenames LICENSE and ANNOUNCE; removed AUTHORS and COPYING.
1636 Removed newline from the end of some error and warning messages.
1637 Removed test for sqrt() from configure.ac and configure.
1638 Made swap tables in pngtrans.c PNG_CONST (Carlo Bramix).
1639 Disabled default iTXt support that was inadvertently enabled in
1640 libpng-1.2.9beta1.
1641 Added "OS2" to list of systems that don't need underscores, in pnggccrd.c
1642 Removed libpng version and date from *.c files.
1643
1644 Version 1.2.9beta5 [March 4, 2006]
1645 Removed trailing blanks from source files.
1646 Put version and date of latest change in each source file, and changed
1647 copyright year accordingly.
1648 More cleanup of configure.ac, Makefile.am, and associated scripts.
1649 Restored scripts/makefile.elf which was inadvertently deleted.
1650
1651 Version 1.2.9beta6 [March 6, 2006]
1652 Fixed typo (RELEASE) in configuration files.
1653
1654 Version 1.2.9beta7 [March 7, 2006]
1655 Removed libpng.vers and libpng.sym from libpng12_la_SOURCES in Makefile.am
1656 Fixed inconsistent #ifdef's around png_sig_bytes() and png_set_sCAL_s()
1657 in png.h.
1658 Updated makefile.elf as suggested by debian.
1659 Made cosmetic changes to some makefiles, adding LN_SF and other macros.
1660 Made some makefiles accept "exec_prefix".
1661
1662 Version 1.2.9beta8 [March 9, 2006]
1663 Fixed some "#if defined (..." which should be "#if defined(..."
1664 Bug introduced in libpng-1.2.8.
1665 Fixed inconsistency in definition of png_default_read_data()
1666 Restored blank that was lost from makefile.sggcc "clean" target in beta7.
1667 Revised calculation of "current" and "major" for irix in ltmain.sh
1668 Changed "mkdir" to "MKDIR_P" in some makefiles.
1669 Separated PNG_EXPAND and PNG_EXPAND_tRNS.
1670 Added png_set_expand_gray_1_2_4_to_8() and deprecated
1671 png_set_gray_1_2_4_to_8() which also expands tRNS to alpha.
1672
1673 Version 1.2.9beta9 [March 10, 2006]
1674 Include "config.h" in pngconf.h when available.
1675 Added some checks for NULL png_ptr or NULL info_ptr (timeless)
1676
1677 Version 1.2.9beta10 [March 20, 2006]
1678 Removed extra CR from contrib/visualpng/VisualPng.dsw (Cosmin)
1679 Made pnggccrd.c PIC-compliant (Christian Aichinger).
1680 Added makefile.mingw (Wolfgang Glas).
1681 Revised pngconf.h MMX checking.
1682
1683 Version 1.2.9beta11 [March 22, 2006]
1684 Fixed out-of-order declaration in pngwrite.c that was introduced in beta9
1685 Simplified some makefiles by using LIBSO, LIBSOMAJ, and LIBSOVER macros.
1686
1687 Version 1.2.9rc1 [March 31, 2006]
1688 Defined PNG_USER_PRIVATEBUILD when including "pngusr.h" (Cosmin).
1689 Removed nonsensical assertion check from pngtest.c (Cosmin).
1690
1691 Version 1.2.9 [April 14, 2006]
1692 Revised makefile.beos and added "none" selector in ltmain.sh
1693
1694 Version 1.2.10beta1 [April 15, 2006]
1695 Renamed "config.h" to "png_conf.h" and revised Makefile.am to add
1696 -DPNG_BUILDING_LIBPNG to compile directive, and modified pngconf.h
1697 to include png_conf.h only when PNG_BUILDING_LIBPNG is defined.
1698
1699 Version 1.2.10beta2 [April 15, 2006]
1700 Manually updated Makefile.in and configure. Changed png_conf.h.in
1701 back to config.h.
1702
1703 Version 1.2.10beta3 [April 15, 2006]
1704 Change png_conf.h back to config.h in pngconf.h.
1705
1706 Version 1.2.10beta4 [April 16, 2006]
1707 Change PNG_BUILDING_LIBPNG to PNG_CONFIGURE_LIBPNG in config/Makefile*.
1708
1709 Version 1.2.10beta5 [April 16, 2006]
1710 Added a configure check for compiling assembler code in pnggccrd.c
1711
1712 Version 1.2.10beta6 [April 17, 2006]
1713 Revised the configure check for pnggccrd.c
1714 Moved -DPNG_CONFIGURE_LIBPNG into @LIBPNG_DEFINES@
1715 Added @LIBPNG_DEFINES@ to arguments when building libpng.sym
1716
1717 Version 1.2.10beta7 [April 18, 2006]
1718 Change "exec_prefix=$prefix" to "exec_prefix=$(prefix)" in makefiles.
1719
1720 Version 1.2.10rc1 [April 19, 2006]
1721 Ensure pngconf.h doesn't define both PNG_USE_PNGGCCRD and PNG_USE_PNGVCRD
1722 Fixed "LN_FS" typo in makefile.sco and makefile.solaris.
1723
1724 Version 1.2.10rc2 [April 20, 2006]
1725 Added a backslash between -DPNG_CONFIGURE_LIBPNG and -DPNG_NO_ASSEMBLER_CODE
1726 in configure.ac and configure
1727 Made the configure warning about versioned symbols less arrogant.
1728
1729 Version 1.2.10rc3 [April 21, 2006]
1730 Added a note in libpng.txt that png_set_sig_bytes(8) can be used when
1731 writing an embedded PNG without the 8-byte signature.
1732 Revised makefiles and configure to avoid making links to libpng.so.*
1733
1734 Version 1.2.10 [April 23, 2006]
1735 Reverted configure to "rc2" state.
1736
1737 Version 1.2.11beta1 [May 31, 2006]
1738 scripts/libpng.pc.in contained "configure" style version info and would
1739 not work with makefiles.
1740 The shared-library makefiles were linking to libpng.so.0 instead of
1741 libpng.so.3 compatibility as the library.
1742
1743 Version 1.2.11beta2 [June 2, 2006]
1744 Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
1745 buffer overflow.
1746 Fixed bug in example.c (png_set_palette_rgb -> png_set_palette_to_rgb)
1747
1748 Version 1.2.11beta3 [June 5, 2006]
1749 Prepended "#! /bin/sh" to ltmail.sh and contrib/pngminus/*.sh (Cosmin).
1750 Removed the accidental leftover Makefile.in~ (Cosmin).
1751 Avoided potential buffer overflow and optimized buffer in
1752 png_write_sCAL(), png_write_sCAL_s() (Cosmin).
1753 Removed the include directories and libraries from CFLAGS and LDFLAGS
1754 in scripts/makefile.gcc (Nelson A. de Oliveira, Cosmin).
1755
1756 Version 1.2.11beta4 [June 6, 2006]
1757 Allow zero-length IDAT chunks after the entire zlib datastream, but not
1758 after another intervening chunk type.
1759
1760 Version 1.0.19rc1, 1.2.11rc1 [June 13, 2006]
1761 Deleted extraneous square brackets from [config.h] in configure.ac
1762
1763 Version 1.0.19rc2, 1.2.11rc2 [June 14, 2006]
1764 Added prototypes for PNG_INCH_CONVERSIONS functions to png.h
1765 Revised INSTALL and autogen.sh
1766 Fixed typo in several makefiles (-W1 should be -Wl)
1767 Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
1768
1769 Version 1.0.19rc3, 1.2.11rc3 [June 15, 2006]
1770 Removed the new typedefs for 64-bit systems (delay until version 1.4.0)
1771 Added one zero element to png_gamma_shift[] array in pngrtran.c to avoid
1772 reading out of bounds.
1773
1774 Version 1.0.19rc4, 1.2.11rc4 [June 15, 2006]
1775 Really removed the new typedefs for 64-bit systems.
1776
1777 Version 1.0.19rc5, 1.2.11rc5 [June 22, 2006]
1778 Removed png_sig_bytes entry from scripts/pngw32.def
1779
1780 Version 1.0.19, 1.2.11 [June 26, 2006]
1781 None.
1782
1783 Version 1.0.20, 1.2.12 [June 27, 2006]
1784 Really increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
1785 buffer overflow.
1786
1787 Version 1.2.13beta1 [October 2, 2006]
1788 Removed AC_FUNC_MALLOC from configure.ac
1789 Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
1790 Change "logical" to "bitwise" throughout documentation.
1791 Detect and fix attempt to write wrong iCCP profile length (CVE-2006-7244)
1792
1793 Version 1.0.21, 1.2.13 [November 14, 2006]
1794 Fix potential buffer overflow in sPLT chunk handler.
1795 Fix Makefile.am to not try to link to noexistent files.
1796 Check all exported functions for NULL png_ptr.
1797
1798 Version 1.2.14beta1 [November 17, 2006]
1799 Relocated three misplaced tests for NULL png_ptr.
1800 Built Makefile.in with automake-1.9.6 instead of 1.9.2.
1801 Build configure with autoconf-2.60 instead of 2.59
1802
1803 Version 1.2.14beta2 [November 17, 2006]
1804 Added some typecasts in png_zalloc().
1805
1806 Version 1.2.14rc1 [November 20, 2006]
1807 Changed "strtod" to "png_strtod" in pngrutil.c
1808
1809 Version 1.0.22, 1.2.14 [November 27, 2006]
1810 Added missing "$(srcdir)" in Makefile.am and Makefile.in
1811
1812 Version 1.2.15beta1 [December 3, 2006]
1813 Generated configure with autoconf-2.61 instead of 2.60
1814 Revised configure.ac to update libpng.pc and libpng-config.
1815
1816 Version 1.2.15beta2 [December 3, 2006]
1817 Always export MMX asm functions, just stubs if not building pnggccrd.c
1818
1819 Version 1.2.15beta3 [December 4, 2006]
1820 Add "png_bytep" typecast to profile while calculating length in pngwutil.c
1821
1822 Version 1.2.15beta4 [December 7, 2006]
1823 Added scripts/CMakeLists.txt
1824 Changed PNG_NO_ASSEMBLER_CODE to PNG_NO_MMX_CODE in scripts, like 1.4.0beta
1825
1826 Version 1.2.15beta5 [December 7, 2006]
1827 Changed some instances of PNG_ASSEMBLER_* to PNG_MMX_* in pnggccrd.c
1828 Revised scripts/CMakeLists.txt
1829
1830 Version 1.2.15beta6 [December 13, 2006]
1831 Revised scripts/CMakeLists.txt and configure.ac
1832
1833 Version 1.2.15rc1 [December 18, 2006]
1834 Revised scripts/CMakeLists.txt
1835
1836 Version 1.2.15rc2 [December 21, 2006]
1837 Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
1838 Added scripts/makefile.nommx
1839
1840 Version 1.2.15rc3 [December 25, 2006]
1841 Fixed shared library numbering error that was introduced in 1.2.15beta6.
1842
1843 Version 1.2.15rc4 [December 27, 2006]
1844 Fixed handling of rgb_to_gray when png_ptr->color.gray isn't set.
1845
1846 Version 1.2.15rc5 [December 31, 2006]
1847 Revised handling of rgb_to_gray.
1848
1849 Version 1.2.15 [January 5, 2007]
1850 Added some (unsigned long) typecasts in pngtest.c to avoid printing errors.
1851
1852 Version 1.2.16beta1 [January 6, 2007]
1853 Fix bugs in makefile.nommx
1854
1855 Version 1.2.16beta2 [January 16, 2007]
1856 Revised scripts/CMakeLists.txt
1857
1858 Version 1.2.16 [January 31, 2007]
1859 No changes.
1860
1861 Version 1.2.17beta1 [March 6, 2007]
1862 Revised scripts/CMakeLists.txt to install both shared and static libraries.
1863 Deleted a redundant line from pngset.c.
1864
1865 Version 1.2.17beta2 [April 26, 2007]
1866 Relocated misplaced test for png_ptr == NULL in pngpread.c
1867 Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
1868 flags.
1869 Changed remaining instances of PNG_ASSEMBLER_* to PNG_MMX_*
1870 Added pngerror() when write_IHDR fails in deflateInit2().
1871 Added "const" to some array declarations.
1872 Mention examples of libpng usage in the libpng*.txt and libpng.3 documents.
1873
1874 Version 1.2.17rc1 [May 4, 2007]
1875 No changes.
1876
1877 Version 1.2.17rc2 [May 8, 2007]
1878 Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications
1879 calling set_unknown_chunk_location() need them.
1880 Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in
1881 png_set_expand_gray_1_2_4_to_8().
1882 Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
1883 can be free'ed in case of error. Revised unknown chunk handling in
1884 pngrutil.c and pngpread.c to use this structure.
1885
1886 Version 1.2.17rc3 [May 8, 2007]
1887 Revised symbol-handling in configure script.
1888
1889 Version 1.2.17rc4 [May 10, 2007]
1890 Revised unknown chunk handling to avoid storing unknown critical chunks.
1891
1892 Version 1.0.25 [May 15, 2007]
1893 Version 1.2.17 [May 15, 2007]
1894 Added "png_ptr->num_trans=0" before error return in png_handle_tRNS,
1895 to eliminate a vulnerability (CVE-2007-2445, CERT VU#684664)
1896
1897 Version 1.0.26 [May 15, 2007]
1898 Version 1.2.18 [May 15, 2007]
1899 Reverted the libpng-1.2.17rc3 change to symbol-handling in configure script
1900
1901 Version 1.2.19beta1 [May 18, 2007]
1902 Changed "const static" to "static PNG_CONST" everywhere, mostly undoing
1903 change of libpng-1.2.17beta2. Changed other "const" to "PNG_CONST"
1904 Changed some handling of unused parameters, to avoid compiler warnings.
1905 "if (unused == NULL) return;" becomes "unused = unused".
1906
1907 Version 1.2.19beta2 [May 18, 2007]
1908 Only use the valid bits of tRNS value in png_do_expand() (Brian Cartier)
1909
1910 Version 1.2.19beta3 [May 19, 2007]
1911 Add some "png_byte" typecasts in png_check_keyword() and write new_key
1912 instead of key in zTXt chunk (Kevin Ryde).
1913
1914 Version 1.2.19beta4 [May 21, 2007]
1915 Add png_snprintf() function and use it in place of sprint() for improved
1916 defense against buffer overflows.
1917
1918 Version 1.2.19beta5 [May 21, 2007]
1919 Fixed png_handle_tRNS() to only use the valid bits of tRNS value.
1920 Changed handling of more unused parameters, to avoid compiler warnings.
1921 Removed some PNG_CONST in pngwutil.c to avoid compiler warnings.
1922
1923 Version 1.2.19beta6 [May 22, 2007]
1924 Added some #ifdef PNG_MMX_CODE_SUPPORTED where needed in pngvcrd.c
1925 Added a special "_MSC_VER" case that defines png_snprintf to _snprintf
1926
1927 Version 1.2.19beta7 [May 22, 2007]
1928 Squelched png_squelch_warnings() in pnggccrd.c and added
1929 an #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused
1930 the warnings that png_squelch_warnings was squelching.
1931
1932 Version 1.2.19beta8 [May 22, 2007]
1933 Removed __MMX__ from test in pngconf.h.
1934
1935 Version 1.2.19beta9 [May 23, 2007]
1936 Made png_squelch_warnings() available via PNG_SQUELCH_WARNINGS macro.
1937 Revised png_squelch_warnings() so it might work.
1938 Updated makefile.sgcc and makefile.solaris; added makefile.solaris-x86.
1939
1940 Version 1.2.19beta10 [May 24, 2007]
1941 Resquelched png_squelch_warnings(), use "__attribute__((used))" instead.
1942
1943 Version 1.4.0beta1 [April 20, 2006]
1944 Enabled iTXt support (changes png_struct, thus requires so-number change).
1945 Cleaned up PNG_ASSEMBLER_CODE_SUPPORTED vs PNG_MMX_CODE_SUPPORTED
1946 Eliminated PNG_1_0_X and PNG_1_2_X macros.
1947 Removed deprecated functions png_read_init, png_write_init, png_info_init,
1948 png_permit_empty_plte, png_set_gray_1_2_4_to_8, png_check_sig, and
1949 removed the deprecated macro PNG_MAX_UINT.
1950 Moved "PNG_INTERNAL" parts of png.h and pngconf.h into pngintrn.h
1951 Removed many WIN32_WCE #ifdefs (Cosmin).
1952 Reduced dependency on C-runtime library when on Windows (Simon-Pierre)
1953 Replaced sprintf() with png_sprintf() (Simon-Pierre)
1954
1955 Version 1.4.0beta2 [April 20, 2006]
1956 Revised makefiles and configure to avoid making links to libpng.so.*
1957 Moved some leftover MMX-related defines from pngconf.h to pngintrn.h
1958 Updated scripts/pngos2.def, pngw32.def, and projects/wince/png32ce.def
1959
1960 Version 1.4.0beta3 [May 10, 2006]
1961 Updated scripts/pngw32.def to comment out MMX functions.
1962 Added PNG_NO_GET_INT_32 and PNG_NO_SAVE_INT_32 macros.
1963 Scripts/libpng.pc.in contained "configure" style version info and would
1964 not work with makefiles.
1965 Revised pngconf.h and added pngconf.h.in, so makefiles and configure can
1966 pass defines to libpng and applications.
1967
1968 Version 1.4.0beta4 [May 11, 2006]
1969 Revised configure.ac, Makefile.am, and many of the makefiles to write
1970 their defines in pngconf.h.
1971
1972 Version 1.4.0beta5 [May 15, 2006]
1973 Added a missing semicolon in Makefile.am and Makefile.in
1974 Deleted extraneous square brackets from configure.ac
1975
1976 Version 1.4.0beta6 [June 2, 2006]
1977 Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
1978 buffer overflow.
1979 Changed sonum from 0 to 1.
1980 Removed unused prototype for png_check_sig() from png.h
1981
1982 Version 1.4.0beta7 [June 16, 2006]
1983 Exported png_write_sig (Cosmin).
1984 Optimized buffer in png_handle_cHRM() (Cosmin).
1985 Set pHYs = 2835 x 2835 pixels per meter, and added
1986 sCAL = 0.352778e-3 x 0.352778e-3 meters, in pngtest.png (Cosmin).
1987 Added png_set_benign_errors(), png_benign_error(), png_chunk_benign_error().
1988 Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
1989 Added "(unsigned long)" typecast on png_uint_32 variables in printf lists.
1990
1991 Version 1.4.0beta8 [June 22, 2006]
1992 Added demonstration of user chunk support in pngtest.c, to support the
1993 public sTER chunk and a private vpAg chunk.
1994
1995 Version 1.4.0beta9 [July 3, 2006]
1996 Removed ordinals from scripts/pngw32.def and removed png_info_int and
1997 png_set_gray_1_2_4_to_8 entries.
1998 Inline call of png_get_uint_32() in png_get_uint_31().
1999 Use png_get_uint_31() to get vpAg width and height in pngtest.c
2000 Removed WINCE and Netware projects.
2001 Removed standalone Y2KINFO file.
2002
2003 Version 1.4.0beta10 [July 12, 2006]
2004 Eliminated automatic copy of pngconf.h to pngconf.h.in from configure and
2005 some makefiles, because it was not working reliably. Instead, distribute
2006 pngconf.h.in along with pngconf.h and cause configure and some of the
2007 makefiles to update pngconf.h from pngconf.h.in.
2008 Added pngconf.h to DEPENDENCIES in Makefile.am
2009
2010 Version 1.4.0beta11 [August 19, 2006]
2011 Removed AC_FUNC_MALLOC from configure.ac.
2012 Added a warning when writing iCCP profile with mismatched profile length.
2013 Patched pnggccrd.c to assemble on x86_64 platforms.
2014 Moved chunk header reading into a separate function png_read_chunk_header()
2015 in pngrutil.c. The chunk header (len+sig) is now serialized in a single
2016 operation (Cosmin).
2017 Implemented support for I/O states. Added png_ptr member io_state, and
2018 functions png_get_io_chunk_name() and png_get_io_state() in pngget.c
2019 (Cosmin).
2020 Added png_get_io_chunk_name and png_get_io_state to scripts/*.def (Cosmin).
2021 Renamed scripts/pngw32.* to scripts/pngwin.* (Cosmin).
2022 Removed the include directories and libraries from CFLAGS and LDFLAGS
2023 in scripts/makefile.gcc (Cosmin).
2024 Used png_save_uint_32() to set vpAg width and height in pngtest.c (Cosmin).
2025 Cast to proper type when getting/setting vpAg units in pngtest.c (Cosmin).
2026 Added pngintrn.h to the Visual C++ projects (Cosmin).
2027 Removed scripts/list (Cosmin).
2028 Updated copyright year in scripts/pngwin.def (Cosmin).
2029 Removed PNG_TYPECAST_NULL and used standard NULL consistently (Cosmin).
2030 Disallowed the user to redefine png_size_t, and enforced a consistent use
2031 of png_size_t across libpng (Cosmin).
2032 Changed the type of png_ptr->rowbytes, PNG_ROWBYTES() and friends
2033 to png_size_t (Cosmin).
2034 Removed png_convert_size() and replaced png_sizeof with sizeof (Cosmin).
2035 Removed some unnecessary type casts (Cosmin).
2036 Changed prototype of png_get_compression_buffer_size() and
2037 png_set_compression_buffer_size() to work with png_size_t instead of
2038 png_uint_32 (Cosmin).
2039 Removed png_memcpy_check() and png_memset_check() (Cosmin).
2040 Fixed a typo (png_byte --> png_bytep) in libpng.3 and libpng.txt (Cosmin).
2041 Clarified that png_zalloc() does not clear the allocated memory,
2042 and png_zalloc() and png_zfree() cannot be PNGAPI (Cosmin).
2043 Renamed png_mem_size_t to png_alloc_size_t, fixed its definition in
2044 pngconf.h, and used it in all memory allocation functions (Cosmin).
2045 Renamed pngintrn.h to pngpriv.h, added a comment at the top of the file
2046 mentioning that the symbols declared in that file are private, and
2047 updated the scripts and the Visual C++ projects accordingly (Cosmin).
2048 Removed circular references between pngconf.h and pngconf.h.in in
2049 scripts/makefile.vc*win32 (Cosmin).
2050 Removing trailing '.' from the warning and error messages (Cosmin).
2051 Added pngdefs.h that is built by makefile or configure, instead of
2052 pngconf.h.in (Glenn).
2053 Detect and fix attempt to write wrong iCCP profile length.
2054
2055 Version 1.4.0beta12 [October 19, 2006]
2056 Changed "logical" to "bitwise" in the documentation.
2057 Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
2058 Add a typecast to stifle compiler warning in pngrutil.c
2059
2060 Version 1.4.0beta13 [November 10, 2006]
2061 Fix potential buffer overflow in sPLT chunk handler.
2062 Fix Makefile.am to not try to link to noexistent files.
2063
2064 Version 1.4.0beta14 [November 15, 2006]
2065 Check all exported functions for NULL png_ptr.
2066
2067 Version 1.4.0beta15 [November 17, 2006]
2068 Relocated two misplaced tests for NULL png_ptr.
2069 Built Makefile.in with automake-1.9.6 instead of 1.9.2.
2070 Build configure with autoconf-2.60 instead of 2.59
2071 Add "install: all" in Makefile.am so "configure; make install" will work.
2072
2073 Version 1.4.0beta16 [November 17, 2006]
2074 Added a typecast in png_zalloc().
2075
2076 Version 1.4.0beta17 [December 4, 2006]
2077 Changed "new_key[79] = '\0';" to "(*new_key)[79] = '\0';" in pngwutil.c
2078 Add "png_bytep" typecast to profile while calculating length in pngwutil.c
2079
2080 Version 1.4.0beta18 [December 7, 2006]
2081 Added scripts/CMakeLists.txt
2082
2083 Version 1.4.0beta19 [May 16, 2007]
2084 Revised scripts/CMakeLists.txt
2085 Rebuilt configure and Makefile.in with newer tools.
2086 Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
2087 Added scripts/makefile.nommx
2088
2089 Version 1.4.0beta20 [July 9, 2008]
2090 Moved several PNG_HAVE_* macros from pngpriv.h to png.h because applications
2091 calling set_unknown_chunk_location() need them.
2092 Moved several macro definitions from pngpriv.h to pngconf.h
2093 Merge with changes to the 1.2.X branch, as of 1.2.30beta04.
2094 Deleted all use of the MMX assembler code and Intel-licensed optimizations.
2095 Revised makefile.mingw
2096
2097 Version 1.4.0beta21 [July 21, 2008]
2098 Moved local array "chunkdata" from pngrutil.c to the png_struct, so
2099 it will be freed by png_read_destroy() in case of a read error (Kurt
2100 Christensen).
2101
2102 Version 1.4.0beta22 [July 21, 2008]
2103 Change "purpose" and "buffer" to png_ptr->chunkdata to avoid memory leaking.
2104
2105 Version 1.4.0beta23 [July 22, 2008]
2106 Change "chunkdata = NULL" to "png_ptr->chunkdata = NULL" several places in
2107 png_decompress_chunk().
2108
2109 Version 1.4.0beta24 [July 25, 2008]
2110 Change all remaining "chunkdata" to "png_ptr->chunkdata" in
2111 png_decompress_chunk(), and remove "chunkdata" from parameter list.
2112 Put a call to png_check_chunk_name() in png_read_chunk_header().
2113 Revised png_check_chunk_name() to reject a name with a lowercase 3rd byte.
2114 Removed two calls to png_check_chunk_name() occurring later in the process.
2115 Define PNG_NO_ERROR_NUMBERS by default in pngconf.h
2116
2117 Version 1.4.0beta25 [July 30, 2008]
2118 Added a call to png_check_chunk_name() in pngpread.c
2119 Reverted png_check_chunk_name() to accept a name with a lowercase 3rd byte.
2120 Added png_push_have_buffer() function to pngpread.c
2121 Eliminated PNG_BIG_ENDIAN_SUPPORTED and associated png_get_* macros.
2122 Made inline expansion of png_get_*() optional with PNG_USE_READ_MACROS.
2123 Eliminated all PNG_USELESS_TESTS and PNG_CORRECT_PALETTE_SUPPORTED code.
2124 Synced contrib directory and configure files with libpng-1.2.30beta06.
2125 Eliminated no-longer-used pngdefs.h (but it's still built in the makefiles)
2126 Relocated a misplaced "#endif /* PNG_NO_WRITE_FILTER */" in pngwutil.c
2127
2128 Version 1.4.0beta26 [August 4, 2008]
2129 Removed png_push_have_buffer() function in pngpread.c. It increased the
2130 compiled library size slightly.
2131 Changed "-Wall" to "-W -Wall" in the CFLAGS in all makefiles (Cosmin Truta)
2132 Declared png_ptr "volatile" in pngread.c and pngwrite.c to avoid warnings.
2133 Updated contrib/visupng/cexcept.h to version 2.0.1
2134 Added PNG_LITERAL_CHARACTER macros for #, [, and ].
2135
2136 Version 1.4.0beta27 [August 5, 2008]
2137 Revised usage of PNG_LITERAL_SHARP in pngerror.c.
2138 Moved newline character from individual png_debug messages into the
2139 png_debug macros.
2140 Allow user to #define their own png_debug, png_debug1, and png_debug2.
2141
2142 Version 1.4.0beta28 [August 5, 2008]
2143 Revised usage of PNG_LITERAL_SHARP in pngerror.c.
2144 Added PNG_STRING_NEWLINE macro
2145
2146 Version 1.4.0beta29 [August 9, 2008]
2147 Revised usage of PNG_STRING_NEWLINE to work on non-ISO compilers.
2148 Added PNG_STRING_COPYRIGHT macro.
2149 Added non-ISO versions of png_debug macros.
2150
2151 Version 1.4.0beta30 [August 14, 2008]
2152 Added premultiplied alpha feature (Volker Wiendl).
2153
2154 Version 1.4.0beta31 [August 18, 2008]
2155 Moved png_set_premultiply_alpha from pngtrans.c to pngrtran.c
2156 Removed extra crc check at the end of png_handle_cHRM(). Bug introduced
2157 in libpng-1.4.0beta20.
2158
2159 Version 1.4.0beta32 [August 19, 2008]
2160 Added PNG_WRITE_FLUSH_SUPPORTED block around new png_flush() call.
2161 Revised PNG_NO_STDIO version of png_write_flush()
2162
2163 Version 1.4.0beta33 [August 20, 2008]
2164 Added png_get|set_chunk_cache_max() to limit the total number of sPLT,
2165 text, and unknown chunks that can be stored.
2166
2167 Version 1.4.0beta34 [September 6, 2008]
2168 Shortened tIME_string to 29 bytes in pngtest.c
2169 Fixed off-by-one error introduced in png_push_read_zTXt() function in
2170 libpng-1.2.30beta04/pngpread.c (Harald van Dijk)
2171
2172 Version 1.4.0beta35 [October 6, 2008]
2173 Changed "trans_values" to "trans_color".
2174 Changed so-number from 0 to 14. Some OS do not like 0.
2175 Revised makefile.darwin to fix shared library numbering.
2176 Change png_set_gray_1_2_4_to_8() to png_set_expand_gray_1_2_4_to_8()
2177 in example.c (debian bug report)
2178
2179 Version 1.4.0beta36 [October 25, 2008]
2180 Sync with tEXt vulnerability fix in libpng-1.2.33rc02.
2181
2182 Version 1.4.0beta37 [November 13, 2008]
2183 Added png_check_cHRM in png.c and moved checking from pngget.c, pngrutil.c,
2184 and pngwrite.c
2185
2186 Version 1.4.0beta38 [November 22, 2008]
2187 Added check for zero-area RGB cHRM triangle in png_check_cHRM() and
2188 png_check_cHRM_fixed().
2189
2190 Version 1.4.0beta39 [November 23, 2008]
2191 Revised png_warning() to write its message on standard output by default
2192 when warning_fn is NULL.
2193
2194 Version 1.4.0beta40 [November 24, 2008]
2195 Eliminated png_check_cHRM(). Instead, always use png_check_cHRM_fixed().
2196 In png_check_cHRM_fixed(), ensure white_y is > 0, and removed redundant
2197 check for all-zero coordinates that is detected by the triangle check.
2198
2199 Version 1.4.0beta41 [November 26, 2008]
2200 Fixed string vs pointer-to-string error in png_check_keyword().
2201 Rearranged test expressions in png_check_cHRM_fixed() to avoid internal
2202 overflows.
2203 Added PNG_NO_CHECK_cHRM conditional.
2204
2205 Version 1.4.0beta42, 43 [December 1, 2008]
2206 Merge png_debug with version 1.2.34beta04.
2207
2208 Version 1.4.0beta44 [December 6, 2008]
2209 Removed redundant check for key==NULL before calling png_check_keyword()
2210 to ensure that new_key gets initialized and removed extra warning
2211 (Merge with version 1.2.34beta05 -- Arvan Pritchard).
2212
2213 Version 1.4.0beta45 [December 9, 2008]
2214 In png_write_png(), respect the placement of the filler bytes in an earlier
2215 call to png_set_filler() (Jim Barry).
2216
2217 Version 1.4.0beta46 [December 10, 2008]
2218 Undid previous change and added PNG_TRANSFORM_STRIP_FILLER_BEFORE and
2219 PNG_TRANSFORM_STRIP_FILLER_AFTER conditionals and deprecated
2220 PNG_TRANSFORM_STRIP_FILLER (Jim Barry).
2221
2222 Version 1.4.0beta47 [December 15, 2008]
2223 Support for dithering was disabled by default, because it has never
2224 been well tested and doesn't work very well. The code has not
2225 been removed, however, and can be enabled by building libpng with
2226 PNG_READ_DITHER_SUPPORTED defined.
2227
2228 Version 1.4.0beta48 [February 14, 2009]
2229 Added new exported function png_calloc().
2230 Combined several instances of png_malloc(); png_memset() into png_calloc().
2231 Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
2232 but was never defined.
2233
2234 Version 1.4.0beta49 [February 28, 2009]
2235 Added png_fileno() macro to pngconf.h, used in pngwio.c
2236 Corrected order of #ifdef's in png_debug definition in png.h
2237 Fixed bug introduced in libpng-1.4.0beta48 with the memset arguments
2238 for pcal_params.
2239 Fixed order of #ifdef directives in the png_debug defines in png.h
2240 (bug introduced in libpng-1.2.34/1.4.0beta29).
2241 Revised comments in png_set_read_fn() and png_set_write_fn().
2242
2243 Version 1.4.0beta50 [March 18, 2009]
2244 Use png_calloc() instead of png_malloc() to allocate big_row_buf when
2245 reading an interlaced file, to avoid a possible UMR.
2246 Undid revision of PNG_NO_STDIO version of png_write_flush(). Users
2247 having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined
2248 or supply their own flush_fn() replacement.
2249 Revised libpng*.txt and png.h documentation about use of png_write_flush()
2250 and png_set_write_fn().
2251 Removed fflush() from pngtest.c.
2252 Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
2253
2254 Version 1.4.0beta51 [March 21, 2009]
2255 Removed new png_fileno() macro from pngconf.h .
2256
2257 Version 1.4.0beta52 [March 27, 2009]
2258 Relocated png_do_chop() ahead of building gamma tables in pngrtran.c
2259 This avoids building 16-bit gamma tables unnecessarily.
2260 Removed fflush() from pngtest.c.
2261 Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
2262 Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt
2263
2264 Version 1.4.0beta53 [April 1, 2009]
2265 Removed some remaining MMX macros from pngpriv.h
2266 Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph Giles)
2267
2268 Version 1.4.0beta54 [April 13, 2009]
2269 Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow
2270 application code writers to bypass the check for multiple inclusion
2271 of setjmp.h when they know that it is safe to ignore the situation.
2272 Eliminated internal use of setjmp() in pngread.c and pngwrite.c
2273 Reordered ancillary chunks in pngtest.png to be the same as what
2274 pngtest now produces, and made some cosmetic changes to pngtest output.
2275 Eliminated deprecated png_read_init_3() and png_write_init_3() functions.
2276
2277 Version 1.4.0beta55 [April 15, 2009]
2278 Simplified error handling in pngread.c and pngwrite.c by putting
2279 the new png_read_cleanup() and png_write_cleanup() functions inline.
2280
2281 Version 1.4.0beta56 [April 25, 2009]
2282 Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress
2283 "shadowed declaration" warning from gcc-4.3.3.
2284 Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration"
2285 warning about a global "gamma" variable in math.h on some platforms.
2286
2287 Version 1.4.0beta57 [May 2, 2009]
2288 Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
2289 but was never defined (again).
2290 Rebuilt configure scripts with autoconf-2.63 instead of 2.62
2291 Removed pngprefs.h and MMX from makefiles
2292
2293 Version 1.4.0beta58 [May 14, 2009]
2294 Changed pngw32.def to pngwin.def in makefile.mingw (typo was introduced
2295 in beta57).
2296 Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)
2297
2298 Version 1.4.0beta59 [May 15, 2009]
2299 Reformated sources in libpng style (3-space intentation, comment format)
2300 Fixed typo in libpng docs (PNG_FILTER_AVE should be PNG_FILTER_AVG)
2301 Added sections about the git repository and our coding style to the
2302 documentation
2303 Relocated misplaced #endif in pngwrite.c, sCAL chunk handler.
2304
2305 Version 1.4.0beta60 [May 19, 2009]
2306 Conditionally compile png_read_finish_row() which is not used by
2307 progressive readers.
2308 Added contrib/pngminim/preader to demonstrate building minimal progressive
2309 decoder, based on contrib/gregbook with embedded libpng and zlib.
2310
2311 Version 1.4.0beta61 [May 20, 2009]
2312 In contrib/pngminim/*, renamed "makefile.std" to "makefile", since there
2313 is only one makefile in those directories, and revised the README files
2314 accordingly.
2315 More reformatting of comments, mostly to capitalize sentences.
2316
2317 Version 1.4.0beta62 [June 2, 2009]
2318 Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
2319 and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
2320 Reformatted several remaining "else statement" into two lines.
2321 Added a section to the libpng documentation about using png_get_io_ptr()
2322 in configure scripts to detect the presence of libpng.
2323
2324 Version 1.4.0beta63 [June 15, 2009]
2325 Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
2326 multiple times and to specify the sample order in the tRNS chunk,
2327 because the ISO PNG specification has a typo in the tRNS table.
2328 Changed several PNG_UNKNOWN_CHUNK_SUPPORTED to
2329 PNG_HANDLE_AS_UNKNOWN_SUPPORTED, to make the png_set_keep mechanism
2330 available for ignoring known chunks even when not saving unknown chunks.
2331 Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
2332 "#if defined()" and "if !defined()" where possible.
2333
2334 Version 1.4.0beta64 [June 24, 2009]
2335 Eliminated PNG_LEGACY_SUPPORTED code.
2336 Moved the various unknown chunk macro definitions outside of the
2337 PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.
2338
2339 Version 1.4.0beta65 [June 26, 2009]
2340 Added a reference to the libpng license in each file.
2341
2342 Version 1.4.0beta66 [June 27, 2009]
2343 Refer to the libpng license instead of the libpng license in each file.
2344
2345 Version 1.4.0beta67 [July 6, 2009]
2346 Relocated INVERT_ALPHA within png_read_png() and png_write_png().
2347 Added high-level API transform PNG_TRANSFORM_GRAY_TO_RGB.
2348 Added an "xcode" project to the projects directory (Alam Arias).
2349
2350 Version 1.4.0beta68 [July 19, 2009]
2351 Avoid some tests in filter selection in pngwutil.c
2352
2353 Version 1.4.0beta69 [July 25, 2009]
2354 Simplified the new filter-selection test. This runs faster in the
2355 common "PNG_ALL_FILTERS" and PNG_FILTER_NONE cases.
2356 Removed extraneous declaration from the new call to png_read_gray_to_rgb()
2357 (bug introduced in libpng-1.4.0beta67).
2358 Fixed up xcode project (Alam Arias)
2359 Added a prototype for png_64bit_product() in png.c
2360
2361 Version 1.4.0beta70 [July 27, 2009]
2362 Avoid a possible NULL dereference in debug build, in png_set_text_2().
2363 (bug introduced in libpng-0.95, discovered by Evan Rouault)
2364
2365 Version 1.4.0beta71 [July 29, 2009]
2366 Rebuilt configure scripts with autoconf-2.64.
2367
2368 Version 1.4.0beta72 [August 1, 2009]
2369 Replaced *.tar.lzma with *.tar.xz in distribution. Get the xz codec
2370 from <http://tukaani.org/xz>.
2371
2372 Version 1.4.0beta73 [August 1, 2009]
2373 Reject attempt to write iCCP chunk with negative embedded profile length
2374 (JD Chen) (CVE-2009-5063).
2375
2376 Version 1.4.0beta74 [August 8, 2009]
2377 Changed png_ptr and info_ptr member "trans" to "trans_alpha".
2378
2379 Version 1.4.0beta75 [August 21, 2009]
2380 Removed an extra png_debug() recently added to png_write_find_filter().
2381 Fixed incorrect #ifdef in pngset.c regarding unknown chunk support.
2382
2383 Version 1.4.0beta76 [August 22, 2009]
2384 Moved an incorrectly located test in png_read_row() in pngread.c
2385
2386 Version 1.4.0beta77 [August 27, 2009]
2387 Removed lpXYZ.tar.bz2 (with CRLF), KNOWNBUG, libpng-x.y.z-KNOWNBUG.txt,
2388 and the "noconfig" files from the distribution.
2389 Moved CMakeLists.txt from scripts into the main libpng directory.
2390 Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
2391
2392 Version 1.4.0beta78 [August 31, 2009]
2393 Converted all PNG_NO_* tests to PNG_*_SUPPORTED everywhere except pngconf.h
2394 Eliminated PNG_NO_FREE_ME and PNG_FREE_ME_SUPPORTED macros.
2395 Use png_malloc plus a loop instead of png_calloc() to initialize
2396 row_pointers in png_read_png().
2397
2398 Version 1.4.0beta79 [September 1, 2009]
2399 Eliminated PNG_GLOBAL_ARRAYS and PNG_LOCAL_ARRAYS; always use local arrays.
2400 Eliminated PNG_CALLOC_SUPPORTED macro and always provide png_calloc().
2401
2402 Version 1.4.0beta80 [September 17, 2009]
2403 Removed scripts/libpng.icc
2404 Changed typecast of filler from png_byte to png_uint_16 in png_set_filler().
2405 (Dennis Gustafsson)
2406 Fixed typo introduced in beta78 in pngtest.c ("#if def " should be "#ifdef ")
2407
2408 Version 1.4.0beta81 [September 23, 2009]
2409 Eliminated unused PNG_FLAG_FREE_* defines from pngpriv.h
2410 Expanded TAB characters in pngrtran.c
2411 Removed PNG_CONST from all "PNG_CONST PNG_CHNK" declarations to avoid
2412 compiler complaints about doubly declaring things "const".
2413 Changed all "#if [!]defined(X)" to "if[n]def X" where possible.
2414 Eliminated unused png_ptr->row_buf_size
2415
2416 Version 1.4.0beta82 [September 25, 2009]
2417 Moved redundant IHDR checking into new png_check_IHDR() in png.c
2418 and report all errors found in the IHDR data.
2419 Eliminated useless call to png_check_cHRM() from pngset.c
2420
2421 Version 1.4.0beta83 [September 25, 2009]
2422 Revised png_check_IHDR() to eliminate bogus complaint about filter_type.
2423
2424 Version 1.4.0beta84 [September 30, 2009]
2425 Fixed some inconsistent indentation in pngconf.h
2426 Revised png_check_IHDR() to add a test for width variable less than 32-bit.
2427
2428 Version 1.4.0beta85 [October 1, 2009]
2429 Revised png_check_IHDR() again, to check info_ptr members instead of
2430 the contents of the returned parameters.
2431
2432 Version 1.4.0beta86 [October 9, 2009]
2433 Updated the "xcode" project (Alam Arias).
2434 Eliminated a shadowed declaration of "pp" in png_handle_sPLT().
2435
2436 Version 1.4.0rc01 [October 19, 2009]
2437 Trivial cosmetic changes.
2438
2439 Version 1.4.0beta87 [October 30, 2009]
2440 Moved version 1.4.0 back into beta.
2441
2442 Version 1.4.0beta88 [October 30, 2009]
2443 Revised libpng*.txt section about differences between 1.2.x and 1.4.0
2444 because most of the new features have now been ported back to 1.2.41
2445
2446 Version 1.4.0beta89 [November 1, 2009]
2447 More bugfixes and improvements to CMakeLists.txt (Philip Lowman)
2448 Removed a harmless extra png_set_invert_alpha() from pngwrite.c
2449 Apply png_user_chunk_cache_max within png_decompress_chunk().
2450 Merged libpng-1.2.41.txt with libpng-1.4.0.txt where appropriate.
2451
2452 Version 1.4.0beta90 [November 2, 2009]
2453 Removed all remaining WIN32_WCE #ifdefs except those involving the
2454 time.h "tm" structure
2455
2456 Version 1.4.0beta91 [November 3, 2009]
2457 Updated scripts/pngw32.def and projects/wince/png32ce.def
2458 Copied projects/wince/png32ce.def to the scripts directory.
2459 Added scripts/makefile.wce
2460 Patched ltmain.sh for wince support.
2461 Added PNG_CONVERT_tIME_SUPPORTED macro.
2462
2463 Version 1.4.0beta92 [November 4, 2009]
2464 Make inclusion of time.h in pngconf.h depend on PNG_CONVERT_tIME_SUPPORTED
2465 Make #define PNG_CONVERT_tIME_SUPPORTED depend on PNG_WRITE_tIME_SUPPORTED
2466 Revised libpng*.txt to describe differences from 1.2.40 to 1.4.0 (instead
2467 of differences from 1.2.41 to 1.4.0)
2468
2469 Version 1.4.0beta93 [November 7, 2009]
2470 Added PNG_DEPSTRUCT, PNG_DEPRECATED, PNG_USE_RESULT, PNG_NORETURN, and
2471 PNG_ALLOCATED macros to detect deprecated direct access to the
2472 png_struct or info_struct members and other deprecated usage in
2473 applications (John Bowler).
2474 Updated scripts/makefile* to add "-DPNG_CONFIGURE_LIBPNG" to CFLAGS,
2475 to prevent warnings about direct access to png structs by libpng
2476 functions while building libpng. They need to be tested, especially
2477 those using compilers other than gcc.
2478 Updated projects/visualc6 and visualc71 with "/d PNG_CONFIGURE_LIBPNG".
2479 They should work but still need to be updated to remove
2480 references to pnggccrd.c or pngvcrd.c and ASM building.
2481 Added README.txt to the beos, cbuilder5, netware, and xcode projects warning
2482 that they need to be updated, to remove references to pnggccrd.c and
2483 pngvcrd.c and to depend on pngpriv.h
2484 Removed three direct references to read_info_ptr members in pngtest.c
2485 that were detected by the new PNG_DEPSTRUCT macro.
2486 Moved the png_debug macro definitions and the png_read_destroy(),
2487 png_write_destroy() and png_far_to_near() prototypes from png.h
2488 to pngpriv.h (John Bowler)
2489 Moved the synopsis lines for png_read_destroy(), png_write_destroy()
2490 png_debug(), png_debug1(), and png_debug2() from libpng.3 to libpngpf.3.
2491
2492 Version 1.4.0beta94 [November 9, 2009]
2493 Removed the obsolete, unused pnggccrd.c and pngvcrd.c files.
2494 Updated CMakeLists.txt to add "-DPNG_CONFIGURE_LIBPNG" to the definitions.
2495 Removed dependency of pngtest.o on pngpriv.h in the makefiles.
2496 Only #define PNG_DEPSTRUCT, etc. in pngconf.h if not already defined.
2497
2498 Version 1.4.0beta95 [November 10, 2009]
2499 Changed png_check_sig() to !png_sig_cmp() in contrib programs.
2500 Added -DPNG_CONFIGURE_LIBPNG to contrib/pngminm/*/makefile
2501 Changed png_check_sig() to !png_sig_cmp() in contrib programs.
2502 Corrected the png_get_IHDR() call in contrib/gregbook/readpng2.c
2503 Changed pngminim/*/gather.sh to stop trying to remove pnggccrd.c and pngvcrd.c
2504 Added dependency on pngpriv.h in contrib/pngminim/*/makefile
2505
2506 Version 1.4.0beta96 [November 12, 2009]
2507 Renamed scripts/makefile.wce to scripts/makefile.cegcc
2508 Revised Makefile.am to use libpng.sys while building libpng.so
2509 so that only PNG_EXPORT functions are exported.
2510 Removed the deprecated png_check_sig() function/macro.
2511 Removed recently removed function names from scripts/*.def
2512 Revised pngtest.png to put chunks in the same order written by pngtest
2513 (evidently the same change made in libpng-1.0beta54 was lost).
2514 Added PNG_PRIVATE macro definition in pngconf.h for possible future use.
2515
2516 Version 1.4.0beta97 [November 13, 2009]
2517 Restored pngtest.png to the libpng-1.4.0beta7 version.
2518 Removed projects/beos and netware.txt; no one seems to be supporting them.
2519 Revised Makefile.in
2520
2521 Version 1.4.0beta98 [November 13, 2009]
2522 Added the "xcode" project to zip distributions,
2523 Fixed a typo in scripts/pngwin.def introduced in beta97.
2524
2525 Version 1.4.0beta99 [November 14, 2009]
2526 Moved libpng-config.in and libpng.pc-configure.in out of the scripts
2527 directory, to libpng-config.in and libpng-pc.in, respectively, and
2528 modified Makefile.am and configure.ac accordingly. Now "configure"
2529 needs nothing from the "scripts" directory.
2530 Avoid redefining PNG_CONST in pngconf.h
2531
2532 Version 1.4.0beta100 [November 14, 2009]
2533 Removed ASM builds from projects/visualc6 and projects/visualc71
2534 Removed scripts/makefile.nommx and makefile.vcawin32
2535 Revised CMakeLists.txt to account for new location of libpng-config.in
2536 and libpng-pc.in
2537 Updated INSTALL to reflect removal and relocation of files.
2538
2539 Version 1.4.0beta101 [November 14, 2009]
2540 Restored the binary files (*.jpg, *.png, some project files) that were
2541 accidentally deleted from the zip and 7z distributions when the xcode
2542 project was added.
2543
2544 Version 1.4.0beta102 [November 18, 2009]
2545 Added libpng-config.in and libpng-pc.in to the zip and 7z distributions.
2546 Fixed a typo in projects/visualc6/pngtest.dsp, introduced in beta100.
2547 Moved descriptions of makefiles and other scripts out of INSTALL into
2548 scripts/README.txt
2549 Updated the copyright year in scripts/pngwin.rc from 2006 to 2009.
2550
2551 Version 1.4.0beta103 [November 21, 2009]
2552 Removed obsolete comments about ASM from projects/visualc71/README_zlib.txt
2553 Align row_buf on 16-byte boundary in memory.
2554 Restored the PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED guard around the call
2555 to png_flush() after png_write_IEND(). See 1.4.0beta32, 1.4.0beta50
2556 changes above and 1.2.30, 1.2.30rc01 and rc03 in 1.2.41 CHANGES. Someone
2557 needs this feature.
2558 Make the 'png_jmpbuf' macro expand to a call that records the correct
2559 longjmp function as well as returning a pointer to the setjmp
2560 jmp_buf buffer, and marked direct access to jmpbuf 'deprecated'.
2561 (John Bowler)
2562
2563 Version 1.4.0beta104 [November 22, 2009]
2564 Removed png_longjmp_ptr from scripts/*.def and libpng.3
2565 Rebuilt configure scripts with autoconf-2.65
2566
2567 Version 1.4.0beta105 [November 25, 2009]
2568 Use fast integer PNG_DIVIDE_BY_255() or PNG_DIVIDE_BY_65535()
2569 to accomplish alpha premultiplication when
2570 PNG_READ_COMPOSITE_NODIV_SUPPORTED is defined.
2571 Changed "/255" to "/255.0" in background calculations to make it clear
2572 that the 255 is used as a double.
2573
2574 Version 1.4.0beta106 [November 27, 2009]
2575 Removed premultiplied alpha feature.
2576
2577 Version 1.4.0beta107 [December 4, 2009]
2578 Updated README
2579 Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
2580 Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
2581 Revised scripts/makefile.netbsd, makefile.openbsd, and makefile.sco
2582 to put png.h and pngconf.h in $prefix/include, like the other scripts,
2583 instead of in $prefix/include/libpng. Also revised makefile.sco
2584 to put them in $prefix/include/libpng15 instead of in
2585 $prefix/include/libpng/libpng15.
2586
2587 Version 1.4.0beta108 [December 11, 2009]
2588 Removed leftover "-DPNG_CONFIGURE_LIBPNG" from contrib/pngminim/*/makefile
2589 Relocated png_do_chop() to its original position in pngrtran.c; the
2590 change in version 1.2.41beta08 caused transparency to be handled wrong
2591 in some 16-bit datastreams (Yusaku Sugai).
2592
2593 Version 1.4.0beta109 [December 13, 2009]
2594 Added "bit_depth" parameter to the private png_build_gamma_table() function.
2595 Pass bit_depth=8 to png_build_gamma_table() when bit_depth is 16 but the
2596 PNG_16_TO_8 transform has been set, to avoid unnecessary build of 16-bit
2597 tables.
2598
2599 Version 1.4.0rc02 [December 20, 2009]
2600 Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c
2601
2602 Version 1.4.0rc03 [December 22, 2009]
2603 Renamed libpng-pc.in back to libpng.pc.in and revised CMakeLists.txt
2604 (revising the change in 1.4.0beta99)
2605
2606 Version 1.4.0rc04 [December 25, 2009]
2607 Swapped PNG_UNKNOWN_CHUNKS_SUPPORTED and PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2608 in pngset.c to be consistent with other changes in version 1.2.38.
2609
2610 Version 1.4.0rc05 [December 25, 2009]
2611 Changed "libpng-pc.in" to "libpng.pc.in" in configure.ac, configure, and
2612 Makefile.in to be consistent with changes in libpng-1.4.0rc03
2613
2614 Version 1.4.0rc06 [December 29, 2009]
2615 Reverted the gamma_table changes from libpng-1.4.0beta109.
2616 Fixed some indentation errors.
2617
2618 Version 1.4.0rc07 [January 1, 2010]
2619 Revised libpng*.txt and libpng.3 about 1.2.x->1.4.x differences.
2620 Use png_calloc() instead of png_malloc(); png_memset() in pngrutil.c
2621 Update copyright year to 2010.
2622
2623 Version 1.4.0rc08 [January 2, 2010]
2624 Avoid deprecated references to png_ptr-io_ptr and png_ptr->error_ptr
2625 in pngtest.c
2626
2627 Version 1.4.0 [January 3, 2010]
2628 No changes.
2629
2630 Version 1.4.1beta01 [January 8, 2010]
2631 Updated CMakeLists.txt for consistent indentation and to avoid an
2632 unclosed if-statement warning (Philip Lowman).
2633 Revised Makefile.am and Makefile.in to remove references to Y2KINFO,
2634 KNOWNBUG, and libpng.la (Robert Schwebel).
2635 Revised the makefiles to install the same files and symbolic
2636 links as configure, except for libpng.la and libpng14.la.
2637 Make png_set|get_compression_buffer_size() available even when
2638 PNG_WRITE_SUPPORTED is not enabled.
2639 Revised Makefile.am and Makefile.in to simplify their maintenance.
2640 Revised scripts/makefile.linux to install a link to libpng14.so.14.1
2641
2642 Version 1.4.1beta02 [January 9, 2010]
2643 Revised the rest of the makefiles to install a link to libpng14.so.14.1
2644
2645 Version 1.4.1beta03 [January 10, 2010]
2646 Removed png_set_premultiply_alpha() from scripts/*.def
2647
2648 Version 1.4.1rc01 [January 16, 2010]
2649 No changes.
2650
2651 Version 1.4.1beta04 [January 23, 2010]
2652 Revised png_decompress_chunk() to improve speed and memory usage when
2653 decoding large chunks.
2654 Added png_set|get_chunk_malloc_max() functions.
2655
2656 Version 1.4.1beta05 [January 26, 2010]
2657 Relocated "int k" declaration in pngtest.c to minimize its scope.
2658
2659 Version 1.4.1beta06 [January 28, 2010]
2660 Revised png_decompress_chunk() to use a two-pass method suggested by
2661 John Bowler.
2662
2663 Version 1.4.1beta07 [February 6, 2010]
2664 Folded some long lines in the source files.
2665 Added defineable PNG_USER_CHUNK_CACHE_MAX, PNG_USER_CHUNK_MALLOC_MAX,
2666 and a PNG_USER_LIMITS_SUPPORTED flag.
2667 Eliminated use of png_ptr->irowbytes and reused the slot in png_ptr as
2668 png_ptr->png_user_chunk_malloc_max.
2669 Revised png_push_save_buffer() to do fewer but larger png_malloc() calls.
2670
2671 Version 1.4.1beta08 [February 6, 2010]
2672 Minor cleanup and updating of dates and copyright year.
2673
2674 Version 1.5.0beta01 [February 7, 2010]
2675 Moved declaration of png_struct into private pngstruct.h and png_info
2676 into pnginfo.h
2677
2678 Version 1.4.1beta09 and 1.5.0beta02 [February 7, 2010]
2679 Reverted to original png_push_save_buffer() code.
2680
2681 Version 1.4.1beta10 and 1.5.0beta03 [February 8, 2010]
2682 Return allocated "old_buffer" in png_push_save_buffer() before
2683 calling png_error(), to avoid a potential memory leak.
2684 Updated configure script to use SO number 15.
2685
2686 Version 1.5.0beta04 [February 9, 2010]
2687 Removed malformed "incomplete struct declaration" of png_info from png.h
2688
2689 Version 1.5.0beta05 [February 12, 2010]
2690 Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
2691 linewrapping that it entailed.
2692 Revised comments in pngstruct.h and pnginfo.h and added pointers to
2693 the libpng license.
2694 Changed PNG_INTERNAL to PNG_EXPOSE_INTERNAL_STRUCTURES
2695 Removed the cbuilder5 project, which has not been updated to 1.4.0.
2696
2697 Version 1.4.1beta12 and 1.5.0beta06 [February 14, 2010]
2698 Fixed type declaration of png_get_chunk_malloc_max() in pngget.c (Daisuke
2699 Nishikawa)
2700
2701 Version 1.5.0beta07 [omitted]
2702
2703 Version 1.5.0beta08 [February 19, 2010]
2704 Changed #ifdef PNG_NO_STDIO_SUPPORTED to #ifdef PNG_NO_CONSOLE_IO_SUPPORTED
2705 wherever png_snprintf() is used to construct error and warning messages.
2706 Noted in scripts/makefile.mingw that it expects to be run under MSYS.
2707 Removed obsolete unused MMX-querying support from contrib/gregbook
2708 Added exported png_longjmp() function.
2709 Removed the AIX redefinition of jmpbuf in png.h
2710 Added -D_ALLSOURCE in configure.ac, makefile.aix, and CMakeLists.txt
2711 when building on AIX.
2712
2713 Version 1.5.0beta09 [February 19, 2010]
2714 Removed -D_ALLSOURCE from configure.ac, makefile.aix, and CMakeLists.txt.
2715 Changed the name of png_ptr->jmpbuf to png_ptr->png_jmpbuf in pngstruct.h
2716
2717 Version 1.5.0beta10 [February 25, 2010]
2718 Removed unused gzio.c from contrib/pngminim gather and makefile scripts
2719 Removed replacement error handlers from contrib/gregbook. Because of
2720 the new png_longjmp() function they are no longer needed.
2721
2722 Version 1.5.0beta11 [March 6, 2010]
2723 Removed checking for already-included setjmp.h from pngconf.h
2724 Fixed inconsistent indentations and made numerous cosmetic changes.
2725 Revised the "SEE ALSO" style of libpng.3, libpngpf.3, and png.5
2726
2727 Version 1.5.0beta12 [March 9, 2010]
2728 Moved "#include png.h" inside pngpriv.h and removed "#include png.h" from
2729 the source files, along with "#define PNG_EXPOSE_INTERNAL_STRUCTURES"
2730 and "#define PNG_NO_PEDANTIC_WARNINGS" (John Bowler).
2731 Created new pngdebug.h and moved debug definitions there.
2732
2733 Version 1.5.0beta13 [March 10, 2010]
2734 Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
2735 Revise the "#ifdef" blocks in png_inflate() so it will compile when neither
2736 PNG_USER_CHUNK_MALLOC_MAX nor PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
2737 is defined.
2738 Removed unused png_measure_compressed_chunk() from pngpriv.h and libpngpf.3
2739 Moved the 'config.h' support from pngconf.h to pngpriv.h
2740 Removed PNGAPI from the png_longjmp_ptr typedef.
2741 Eliminated dependence of pngtest.c on the private pngdebug.h file.
2742 Make all png_debug macros into *unterminated* statements or
2743 expressions (i.e. a trailing ';' must always be added) and correct
2744 the format statements in various png_debug messages.
2745
2746 Version 1.5.0beta14 [March 14, 2010]
2747 Removed direct access to png_ptr->io_ptr from the Windows code in pngtest.c
2748 Revised Makefile.am to account for recent additions and replacements.
2749 Corrected CE and OS/2 DEF files (scripts/png*def) for symbols removed and
2750 added ordinal numbers to the Windows DEF file and corrected the duplicated
2751 ordinal numbers on CE symbols that are commented out.
2752 Added back in export symbols that can be present in the Windows build but
2753 are disabled by default.
2754 PNG_EXPORT changed to include an 'ordinal' field for DEF file generation.
2755 PNG_CALLBACK added to make callback definitions uniform. PNGAPI split
2756 into PNGCAPI (base C form), PNGAPI (exports) and PNGCBAPI (callbacks),
2757 and appropriate changes made to all files. Cygwin builds re-hinged to
2758 allow procedure call standard changes and to remove the need for the DEF
2759 file (fixes build on Cygwin).
2760 Enabled 'attribute' warnings that are relevant to library APIs and callbacks.
2761 Changed rules for generation of the various symbol files and added a new
2762 rule for a DEF file (which is also added to the distribution).
2763 Updated the symbol file generation to stop it adding spurious spaces
2764 to EOL (coming from preprocessor macro expansion). Added a facility
2765 to join tokens in the output and rewrite *.dfn to use this.
2766 Eliminated scripts/*.def in favor of libpng.def; updated projects/visualc71
2767 and removed scripts/makefile.cygwin.
2768 Made PNG_BUILD_DLL safe: it can be set whenever a DLL is being built.
2769 Removed the include of sys/types.h - apparently unnecessary now on the
2770 platforms on which it happened (all but Mac OS and RISC OS).
2771 Moved the Mac OS test into pngpriv.h (the only place it is used.)
2772
2773 Version 1.5.0beta15 [March 17, 2010]
2774 Added symbols.chk target to Makefile.am to validate the symbols in png.h
2775 against the new DEF file scripts/symbols.def.
2776 Changed the default DEF file back to pngwin.def.
2777 Removed makefile.mingw.
2778 Eliminated PNG_NO_EXTERN and PNG_ALL_EXTERN
2779
2780 Version 1.5.0beta16 [April 1, 2010]
2781 Make png_text_struct independent of PNG_iTXt_SUPPORTED, so that
2782 fields are initialized in all configurations. The READ/WRITE
2783 macros (PNG_(READ|WRITE)_iTXt_SUPPORTED) still function as
2784 before to disable code to actually read or write iTXt chunks
2785 and iTXt_SUPPORTED can be used to detect presence of either
2786 read or write support (but it is probably better to check for
2787 the one actually required - read or write.)
2788 Combined multiple png_warning() calls for a single error.
2789 Restored the macro definition of png_check_sig().
2790
2791 Version 1.5.0beta17 [April 17, 2010]
2792 Added some "(long)" typecasts to printf calls in png_handle_cHRM().
2793 Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
2794 Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
2795 more accurately what it actually does. At the same time, renamed
2796 the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
2797 PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
2798 Added some "(long)" typecasts to printf calls in png_handle_cHRM().
2799 Freeze build-time only configuration in the build.
2800 In all prior versions of libpng most configuration options
2801 controlled by compiler #defines had to be repeated by the
2802 application code that used libpng. This patch changes this
2803 so that compilation options that can only be changed at build
2804 time are frozen in the build. Options that are compiler
2805 dependent (and those that are system dependent) are evaluated
2806 each time - pngconf.h holds these. Options that can be changed
2807 per-file in the application are in png.h. Frozen options are
2808 in the new installed header file pnglibconf.h (John Bowler)
2809 Removed the xcode project because it has not been updated to work
2810 with libpng-1.5.0.
2811 Removed the ability to include optional pngusr.h
2812
2813 Version 1.5.0beta18 [April 17, 2010]
2814 Restored the ability to include optional pngusr.h
2815 Moved replacements for png_error() and png_warning() from the
2816 contrib/pngminim project to pngerror.c, for use when warnings or
2817 errors are disabled via PNG_NO_WARN or PNG_NO_ERROR_TEXT, to avoid
2818 storing unneeded error/warning text.
2819 Updated contrib/pngminim project to work with the new pnglibconf.h
2820 Added some PNG_NO_* defines to contrib/pngminim/*/pngusr.h to save space.
2821
2822 Version 1.5.0beta19 [April 24, 2010]
2823 Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED. This allows the functions
2824 to read and write ints to be disabled independently of PNG_USE_READ_MACROS,
2825 which allows libpng to be built with the functions even though the default
2826 is to use the macros - this allows applications to choose at app build
2827 time whether or not to use macros (previously impossible because the
2828 functions weren't in the default build.)
2829 Changed Windows calling convention back to __cdecl for API functions.
2830 For Windows/x86 platforms only:
2831 __stdcall is no longer needed for Visual Basic, so libpng-1.5.0 uses
2832 __cdecl throughout (both API functions and callbacks) on Windows/x86
2833 platforms.
2834 Replaced visualc6 and visualc71 projects with new vstudio project
2835 Relaxed the overly-restrictive permissions of some files.
2836
2837 Version 1.5.0beta20 [April 24, 2010]
2838 Relaxed more overly-restrictive permissions of some files.
2839
2840 Version 1.5.0beta21 [April 27, 2010]
2841 Removed some unwanted binary bytes and changed CRLF to NEWLINE in the new
2842 vstudio project files, and some trivial editing of some files in the
2843 scripts directory.
2844 Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in
2845 contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
2846
2847 Version 1.5.0beta22 [April 28, 2010]
2848 Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS
2849 because it has a macro equivalent.
2850 Improved the options.awk script; added an "everything off" option.
2851 Revised contrib/pngminim to use the "everything off" option in pngusr.dfa.
2852
2853 Version 1.5.0beta23 [April 29, 2010]
2854 Corrected PNG_REMOVED macro to take five arguments.
2855 The macro was documented with two arguments (name,ordinal), however
2856 the symbol checking .dfn files assumed five arguments. The five
2857 argument form seems more useful so it is changed to that.
2858 Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2859 in gregbook/readpng2.c
2860 Corrected protection of png_get_user_transform_ptr. The API declaration in
2861 png.h is removed if both READ and WRITE USER_TRANSFORM are turned off
2862 but was left defined in pngtrans.c
2863 Added logunsupported=1 to cause pnglibconf.h to document disabled options.
2864 This makes the installed pnglibconf.h more readable but causes no
2865 other change. The intention is that users of libpng will find it
2866 easier to understand if an API they need is missing.
2867 Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined.
2868 Removed dummy_inflate.c from contrib/pngminim/encoder
2869 Removed contrib/pngminim/*/gather.sh; gathering is now done in the makefile.
2870
2871 Version 1.5.0beta24 [May 7, 2010]
2872 Use bitwise "&" instead of arithmetic mod in pngrutil.c calculation of the
2873 offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
2874 Added more blank lines for readability.
2875
2876 Version 1.5.0beta25 [June 18, 2010]
2877 In pngpread.c: png_push_have_row() add check for new_row > height
2878 Removed the now-redundant check for out-of-bounds new_row from example.c
2879
2880 Version 1.5.0beta26 [June 18, 2010]
2881 In pngpread.c: png_push_process_row() add check for too many rows.
2882
2883 Version 1.5.0beta27 [June 18, 2010]
2884 Removed the check added in beta25 as it is now redundant.
2885
2886 Version 1.5.0beta28 [June 20, 2010]
2887 Rewrote png_process_IDAT_data to consistently treat extra data as warnings
2888 and handle end conditions more cleanly.
2889 Removed the new (beta26) check in png_push_process_row().
2890
2891 Version 1.5.0beta29 [June 21, 2010]
2892 Revised scripts/options.awk to work on Sunos (but still doesn't work)
2893 Added comment to options.awk and contrib/pngminim/*/makefile to try nawk.
2894
2895 Version 1.5.0beta30 [June 22, 2010]
2896 Stop memory leak when reading a malformed sCAL chunk.
2897
2898 Version 1.5.0beta31 [June 26, 2010]
2899 Revised pngpread.c patch of beta28 to avoid an endless loop.
2900 Removed some trailing blanks.
2901
2902 Version 1.5.0beta32 [June 26, 2010]
2903 Removed leftover scripts/options.patch and scripts/options.rej
2904
2905 Version 1.5.0beta33 [July 6, 3010]
2906 Made FIXED and FLOATING options consistent in the APIs they enable and
2907 disable. Corrected scripts/options.awk to handle both command line
2908 options and options specified in the .dfa files.
2909 Changed char *msg to PNG_CONST char *msg in pngrutil.c
2910 Make png_set_sRGB_gAMA_and_cHRM set values using either the fixed or
2911 floating point APIs, but not both.
2912 Reversed patch to remove error handler when the jmp_buf is stored in the
2913 main program structure, not the png_struct.
2914 The error handler is needed because the default handler in libpng will
2915 always use the jmp_buf in the library control structure; this is never
2916 set. The gregbook code is a useful example because, even though it
2917 uses setjmp/longjmp, it shows how error handling can be implemented
2918 using control mechanisms not directly supported by libpng. The
2919 technique will work correctly with mechanisms such as Microsoft
2920 Structure Exceptions or C++ exceptions (compiler willing - note that gcc
2921 does not by default support interworking of C and C++ error handling.)
2922 Reverted changes to call png_longjmp in contrib/gregbook where it is not
2923 appropriate. If mainprog->jmpbuf is used by setjmp, then png_longjmp
2924 cannot be used.
2925 Changed "extern PNG_EXPORT" to "PNG_EXPORT" in png.h (Jan Nijtmans)
2926 Changed "extern" to "PNG_EXTERN" in pngpriv.h (except for the 'extern "C" {')
2927
2928 Version 1.5.0beta34 [July 12, 2010]
2929 Put #ifndef PNG_EXTERN, #endif around the define PNG_EXTERN in pngpriv.h
2930
2931 Version 1.5.0beta35 [July 24, 2010]
2932 Removed some newly-added TAB characters.
2933 Added -DNO_PNG_SNPRINTF to CFLAGS in scripts/makefile.dj2
2934 Moved the definition of png_snprintf() outside of the enclosing
2935 #ifdef blocks in pngconf.h
2936
2937 Version 1.5.0beta36 [July 29, 2010]
2938 Patches by John Bowler:
2939 Fixed point APIs are now supported throughout (no missing APIs).
2940 Internal fixed point arithmetic support exists for all internal floating
2941 point operations.
2942 sCAL validates the floating point strings it is passed.
2943 Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2
2944 Two new APIs exist to get the number of passes without turning on the
2945 PNG_INTERLACE transform and to get the number of rows in the current
2946 pass.
2947 A new test program, pngvalid.c, validates the gamma code.
2948 Errors in the 16-bit gamma correction (overflows) have been corrected.
2949 cHRM chunk testing is done consistently (previously the floating point
2950 API bypassed it, because the test really didn't work on FP, now the test
2951 is performed on the actual values to be stored in the PNG file so it
2952 works in the FP case too.)
2953 Most floating point APIs now simply call the fixed point APIs after
2954 converting the values to the fixed point form used in the PNG file.
2955 The standard headers no longer include zlib.h, which is currently only
2956 required for pngstruct.h and can therefore be internal.
2957 Revised png_get_int_32 to undo the PNG two's complement representation of
2958 negative numbers.
2959
2960 Version 1.5.0beta37 [July 30, 2010]
2961 Added a typecast in png_get_int_32() in png.h and pngrutil.h to avoid
2962 a compiler warning.
2963 Replaced oFFs 0,0 with oFFs -10,20 in pngtest.png
2964
2965 Version 1.5.0beta38 [July 31, 2010]
2966 Implemented remaining "_fixed" functions.
2967 Corrected a number of recently introduced warnings mostly resulting from
2968 safe but uncast assignments to shorter integers. Also added a zlib
2969 VStudio release library project because the latest zlib Official Windows
2970 build does not include such a thing.
2971 Revised png_get_int_16() to be similar to png_get_int_32().
2972 Restored projects/visualc71.
2973
2974 Version 1.5.0beta39 [August 2, 2010]
2975 VisualC/GCC warning fixes, VisualC build fixes
2976 The changes include support for function attributes in VC in addition to
2977 those already present in GCC - necessary because without these some
2978 warnings are unavoidable. Fixes include signed/unsigned fixes in
2979 pngvalid and checks with gcc -Wall -Wextra -Wunused.
2980 VC requires function attributes on function definitions as well as
2981 declarations, PNG_FUNCTION has been added to enable this and the
2982 relevant function definitions changed.
2983
2984 Version 1.5.0beta40 [August 6, 2010]
2985 Correct use of _WINDOWS_ in pngconf.h
2986 Removed png_mem_ #defines; they are no longer used.
2987 Added the sRGB chunk to pngtest.png
2988
2989 Version 1.5.0beta41 [August 11, 2010]
2990 Added the cHRM chunk to pngtest.png
2991 Don't try to use version-script with cygwin/mingw.
2992 Revised contrib/gregbook to work under cygwin/mingw.
2993
2994 Version 1.5.0beta42 [August 18, 2010]
2995 Add .dll.a to the list of extensions to be symlinked by Makefile.am (Yaakov)
2996 Made all API functions that have const arguments and constant string
2997 literal pointers declare them (John Bowler).
2998
2999 Version 1.5.0beta43 [August 20, 2010]
3000 Removed spurious tabs, shorten long lines (no source change)
3001 Also added scripts/chkfmt to validate the format of all the files that can
3002 reasonably be validated (it is suggested to run "make distclean" before
3003 checking, because some machine generated files have long lines.)
3004 Reformatted the CHANGES file to be more consistent throughout.
3005 Made changes to address various issues identified by GCC, mostly
3006 signed/unsigned and shortening problems on assignment but also a few
3007 difficult to optimize (for GCC) loops.
3008 Fixed non-GCC fixed point builds. In png.c a declaration was misplaced
3009 in an earlier update. Fixed to declare the auto variables at the head.
3010 Use cexcept.h in pngvalid.c.
3011
3012 Version 1.5.0beta44 [August 24, 2010]
3013 Updated CMakeLists.txt to use CMAKE_INSTALL_LIBDIR variable; useful for
3014 installing libpng in /usr/lib64 (Funda Wang).
3015 Revised CMakeLists.txt to put the man pages in share/man/man* not man/man*
3016 Revised CMakeLists.txt to make symlinks instead of copies when installing.
3017 Changed PNG_LIB_NAME from pngNN to libpngNN in CMakeLists.txt (Philip Lowman)
3018 Implemented memory checks within pngvalid
3019 Reformatted/rearranged pngvalid.c to assist use of progressive reader.
3020 Check interlaced images in pngvalid
3021 Clarified pngusr.h comments in pnglibconf.dfa
3022 Simplified the pngvalid error-handling code now that cexcept.h is in place.
3023 Implemented progressive reader in pngvalid.c for standard tests
3024 Implemented progressive read in pngvalid.c gamma tests
3025 Turn on progressive reader in pngvalid.c by default and tidy code.
3026
3027 Version 1.5.0beta45 [August 26, 2010]
3028 Added an explicit make step to projects/vstudio for pnglibconf.h
3029 Also corrected zlib.vcxproj into which Visual Studio had introduced
3030 what it calls an "authoring error". The change to make pnglibconf.h
3031 simply copies the file; in the future it may actually generate the
3032 file from scripts/pnglibconf.dfa as the other build systems do.
3033 Changed pngvalid to work when floating point APIs are disabled
3034 Renamed the prebuilt scripts/pnglibconf.h to scripts/pnglibconf.h.prebuilt
3035 Supply default values for PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX
3036 in pngpriv.h in case the user neglected to define them in their pngusr.h
3037
3038 Version 1.5.0beta46 [August 28, 2010]
3039 Added new private header files to libpng_sources in CMakeLists.txt
3040 Added PNG_READ_16BIT, PNG_WRITE_16BIT, and PNG_16BIT options.
3041 Added reference to scripts/pnglibconf.h.prebuilt in the visualc71 project.
3042
3043 Version 1.5.0beta47 [September 11, 2010]
3044 Fixed a number of problems with 64-bit compilation reported by Visual
3045 Studio 2010 (John Bowler).
3046
3047 Version 1.5.0beta48 [October 4, 2010]
3048 Updated CMakeLists.txt (Philip Lowman).
3049 Revised autogen.sh to recognize and use $AUTOCONF, $AUTOMAKE, $AUTOHEADER,
3050 $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE
3051 Fixed problem with symbols creation in Makefile.am which was assuming that
3052 all versions of ccp write to standard output by default (Martin Banky). The
3053 bug was introduced in libpng-1.2.9beta5.
3054 Removed unused mkinstalldirs.
3055
3056 Version 1.5.0beta49 [October 8, 2010]
3057 Undid Makefile.am revision of 1.5.0beta48.
3058
3059 Version 1.5.0beta50 [October 14, 2010]
3060 Revised Makefile.in to account for mkinstalldirs being removed.
3061 Added some "(unsigned long)" typecasts in printf statements in pngvalid.c.
3062 Suppressed a compiler warning in png_handle_sPLT().
3063 Check for out-of-range text compression mode in png_set_text().
3064
3065 Version 1.5.0beta51 [October 15, 2010]
3066 Changed embedded dates to "(PENDING RELEASE) in beta releases (and future
3067 rc releases) to minimize the difference between releases.
3068
3069 Version 1.5.0beta52 [October 16, 2010]
3070 Restored some of the embedded dates (in png.h, png.c, documentation, etc.)
3071
3072 Version 1.5.0beta53 [October 18, 2010]
3073 Updated INSTALL to mention using "make maintainer-clean" and to remove
3074 obsolete statement about a custom ltmain.sh
3075 Disabled "color-tests" by default in Makefile.am so it will work with
3076 automake versions earlier than 1.11.1
3077 Use document name "libpng-manual.txt" instead of "libpng-<version>.txt"
3078 to simplify version differences.
3079 Removed obsolete remarks about setjmp handling from INSTALL.
3080 Revised and renamed the typedef in png.h and png.c that was designed
3081 to catch library and header mismatch.
3082
3083 Version 1.5.0beta54 [November 10, 2010]
3084 Require 48 bytes, not 64 bytes, for big_row_buf in overflow checks.
3085 Used a consistent structure for the pngget.c functions.
3086
3087 Version 1.5.0beta55 [November 21, 2010]
3088 Revised png_get_uint_32, png_get_int_32, png_get_uint_16 (Cosmin)
3089 Moved reading of file signature into png_read_sig (Cosmin)
3090 Fixed atomicity of chunk header serialization (Cosmin)
3091 Added test for io_state in pngtest.c (Cosmin)
3092 Added "#!/bin/sh" at the top of contrib/pngminim/*/gather.sh scripts.
3093 Changes to remove gcc warnings (John Bowler)
3094 Certain optional gcc warning flags resulted in warnings in libpng code.
3095 With these changes only -Wconversion and -Wcast-qual cannot be turned on.
3096 Changes are trivial rearrangements of code. -Wconversion is not possible
3097 for pngrutil.c (because of the widespread use of += et al on variables
3098 smaller than (int) or (unsigned int)) and -Wcast-qual is not possible
3099 with pngwio.c and pngwutil.c because the 'write' callback and zlib
3100 compression both fail to declare their input buffers with 'const'.
3101
3102 Version 1.5.0beta56 [December 7, 2010]
3103 Added the private PNG_UNUSED() macro definition in pngpriv.h.
3104 Added some commentary about PNG_EXPORT in png.h and pngconf.h
3105 Revised PNG_EXPORT() macro and added PNG_EXPORTA() macro, with the
3106 objective of simplifying and improving the cosmetic appearance of png.h.
3107 Fixed some incorrect "=" macro names in pnglibconf.dfa
3108 Included documentation of changes in 1.5.0 from 1.4.x in libpng-manual.txt
3109
3110 Version 1.5.0beta57 [December 9, 2010]
3111 Documented the pngvalid gamma error summary with additional comments and
3112 print statements.
3113 Improved missing symbol handling in checksym.awk; symbols missing in both
3114 the old and new files can now be optionally ignored, treated as errors
3115 or warnings.
3116 Removed references to pngvcrd.c and pnggccrd.c from the vstudio project.
3117 Updated "libpng14" to "libpng15" in the visualc71 project.
3118 Enabled the strip16 tests in pngvalid.`
3119 Don't display test results (except PASS/FAIL) when running "make test".
3120 Instead put them in pngtest-log.txt
3121 Added "--with-zprefix=<string>" to configure.ac
3122 Updated the prebuilt configuration files to autoconf version 2.68
3123
3124 Version 1.5.0beta58 [December 19, 2010]
3125 Fixed interlace image handling and add test cases (John Bowler)
3126 Fixed the clean rule in Makefile.am to remove pngtest-log.txt
3127 Made minor changes to work around warnings in gcc 3.4
3128
3129 Version 1.5.0rc01 [December 27, 2010]
3130 No changes.
3131
3132 Version 1.5.0rc02 [December 27, 2010]
3133 Eliminated references to the scripts/*.def files in project/visualc71.
3134
3135 Version 1.5.0rc03 [December 28, 2010]
3136 Eliminated scripts/*.def and revised Makefile.am accordingly
3137
3138 Version 1.5.0rc04 [December 29, 2010]
3139 Fixed bug in background transformation handling in pngrtran.c (it was
3140 looking for the flag in png_ptr->transformations instead of in
3141 png_ptr->flags) (David Raymond).
3142
3143 Version 1.5.0rc05 [December 31, 2010]
3144 Fixed typo in a comment in CMakeLists.txt (libpng14 => libpng15) (Cosmin)
3145
3146 Version 1.5.0rc06 [January 4, 2011]
3147 Changed the new configure option "zprefix=string" to "zlib-prefix=string"
3148
3149 Version 1.5.0rc07 [January 4, 2011]
3150 Updated copyright year.
3151
3152 Version 1.5.0 [January 6, 2011]
3153 No changes.
3154
3155 version 1.5.1beta01 [January 8, 2011]
3156 Added description of png_set_crc_action() to the manual.
3157 Added a note in the manual that the type of the iCCP profile was changed
3158 from png_charpp to png_bytepp in png_get_iCCP(). This change happened
3159 in version 1.5.0beta36 but is not noted in the CHANGES. Similarly,
3160 it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
3161 Ensure that png_rgb_to_gray ignores palette mapped images, if libpng
3162 internally happens to call it with one, and fixed a failure to handle
3163 palette mapped images correctly. This fixes CVE-2690.
3164
3165 Version 1.5.1beta02 [January 14, 2011]
3166 Fixed a bug in handling of interlaced images (bero at arklinux.org).
3167 Updated CMakeLists.txt (Clifford Yapp)
3168
3169 Version 1.5.1beta03 [January 14, 2011]
3170 Fixed typecasting of some png_debug() statements (Cosmin)
3171
3172 Version 1.5.1beta04 [January 16, 2011]
3173 Updated documentation of png_set|get_tRNS() (Thomas Klausner).
3174 Mentioned in the documentation that applications must #include "zlib.h"
3175 if they need access to anything in zlib.h, and that a number of
3176 macros such as png_memset() are no longer accessible by applications.
3177 Corrected pngvalid gamma test "sample" function to access all of the color
3178 samples of each pixel, instead of sampling the red channel three times.
3179 Prefixed variable names index, div, exp, gamma with "png_" to avoid "shadow"
3180 warnings, and (mistakenly) changed png_exp() to exp().
3181
3182 Version 1.5.1beta05 [January 16, 2011]
3183 Changed variable names png_index, png_div, png_exp, and png_gamma to
3184 char_index, divisor, exp_b10, and gamma_val, respectively, and
3185 changed exp() back to png_exp().
3186
3187 Version 1.5.1beta06 [January 20, 2011]
3188 Prevent png_push_crc_skip() from hanging while reading an unknown chunk
3189 or an over-large compressed zTXt chunk with the progressive reader.
3190 Eliminated more GCC "shadow" warnings.
3191 Revised png_fixed() in png.c to avoid compiler warning about reaching the
3192 end without returning anything.
3193
3194 Version 1.5.1beta07 [January 22, 2011]
3195 In the manual, describe the png_get_IHDR() arguments in the correct order.
3196 Added const_png_structp and const_png_infop types, and used them in
3197 prototypes for most png_get_*() functions.
3198
3199 Version 1.5.1beta08 [January 23, 2011]
3200 Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
3201 Added synopses for the IO_STATE functions and other missing synopses
3202 to the manual. Removed the synopses from libpngpf.3 because they
3203 were out of date and no longer useful. Better information can be
3204 obtained by reading the prototypes and comments in pngpriv.h
3205 Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
3206 Added a make macro DFNCPP that is a CPP that will accept the tokens in
3207 a .dfn file and adds configure stuff to test for such a CPP. ./configure
3208 should fail if one is not available.
3209 Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
3210 Added png_get_current_row_number and png_get_current_pass_number for the
3211 benefit of the user transform callback.
3212 Added png_process_data_pause and png_process_data_skip for the benefit of
3213 progressive readers that need to stop data processing or want to optimize
3214 skipping of unread data (e.g., if the reader marks a chunk to be skipped.)
3215
3216 Version 1.5.1beta09 [January 24, 2011]
3217 Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error.
3218 pngvalid contains tests of transforms, which tests are currently disabled
3219 because they are incompletely tested. gray_to_rgb was failing to expand
3220 the bit depth for smaller bit depth images; this seems to be a long
3221 standing error and resulted, apparently, in invalid output
3222 (CVE-2011-0408, CERT VU#643140). The documentation did not accurately
3223 describe what libpng really does when converting RGB to gray.
3224
3225 Version 1.5.1beta10 [January 27, 2010]
3226 Fixed incorrect examples of callback prototypes in the manual, that were
3227 introduced in libpng-1.0.0.
3228 In addition the order of the png_get_uint macros with respect to the
3229 relevant function definitions has been reversed. This helps the
3230 preprocessing of the symbol files be more robust. Furthermore, the
3231 symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when
3232 the library may actually be built with PNG_USE_READ_MACROS; this stops
3233 the read macros interfering with the symbol file format.
3234 Made the manual, synopses, and function prototypes use the function
3235 argument names file_gamma, int_file_gamma, and srgb_intent consistently.
3236
3237 Version 1.5.1beta11 [January 28, 2011]
3238 Changed PNG_UNUSED from "param=param;" to "{if(param){}}".
3239 Corrected local variable type in new API png_process_data_skip()
3240 The type was self-evidently incorrect but only causes problems on 64-bit
3241 architectures.
3242 Added transform tests to pngvalid and simplified the arguments.
3243
3244 Version 1.5.1rc01 [January 29, 2011]
3245 No changes.
3246
3247 Version 1.5.1rc02 [January 31, 2011]
3248 Added a request in the manual that applications do not use "png_" or
3249 "PNG_" to begin any of their own symbols.
3250 Changed PNG_UNUSED to "(void)param;" and updated the commentary in pngpriv.h
3251
3252 Version 1.5.1 [February 3, 2011]
3253 No changes.
3254
3255 Version 1.5.2beta01 [February 13, 2011]
3256 More -Wshadow fixes for older gcc compilers. Older gcc versions apparently
3257 check formal parameters names in function declarations (as well as
3258 definitions) to see if they match a name in the global namespace.
3259 Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the
3260 old VisualC++ preprocessor.
3261 Turned on interlace handling in png_read_png().
3262 Fixed gcc pendantic warnings.
3263 Handle longjmp in Cygwin.
3264 Fixed png_get_current_row_number() in the interlaced case.
3265 Cleaned up ALPHA flags and transformations.
3266 Implemented expansion to 16 bits.
3267
3268 Version 1.5.2beta02 [February 19, 2011]
3269 Fixed mistake in the descriptions of user read_transform and write_transform
3270 function prototypes in the manual. The row_info struct is png_row_infop.
3271 Reverted png_get_current_row_number() to previous (1.5.2beta01) behavior.
3272 Corrected png_get_current_row_number documentation
3273 Fixed the read/write row callback documentation.
3274 This documents the current behavior, where the callback is called after
3275 every row with information pertaining to the next row.
3276
3277 Version 1.5.2beta03 [March 3, 2011]
3278 Fixed scripts/makefile.vcwin32
3279 Updated contrib/pngsuite/README to add the word "modify".
3280 Define PNG_ALLOCATED to blank when _MSC_VER<1300.
3281
3282 Version 1.5.2rc01 [March 19, 2011]
3283 Define remaining attributes to blank when MSC_VER<1300.
3284 ifdef out mask arrays in pngread.c when interlacing is not supported.
3285
3286 Version 1.5.2rc02 [March 22, 2011]
3287 Added a hint to try CPP=/bin/cpp if "cpp -E" fails in scripts/pnglibconf.mak
3288 and in contrib/pngminim/*/makefile, eg., on SunOS 5.10, and removed "strip"
3289 from the makefiles.
3290 Fixed a bug (present since libpng-1.0.7) that makes png_handle_sPLT() fail
3291 to compile when PNG_NO_POINTER_INDEXING is defined (Chubanov Kirill)
3292
3293 Version 1.5.2rc03 [March 24, 2011]
3294 Don't include standard header files in png.h while building the symbol table,
3295 to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro).
3296
3297 Version 1.5.2 [March 31, 2011]
3298 No changes.
3299
3300 Version 1.5.3beta01 [April 1, 2011]
3301 Re-initialize the zlib compressor before compressing non-IDAT chunks.
3302 Added API functions (png_set_text_compression_level() and four others) to
3303 set parameters for zlib compression of non-IDAT chunks.
3304
3305 Version 1.5.3beta02 [April 3, 2011]
3306 Updated scripts/symbols.def with new API functions.
3307 Only compile the new zlib re-initializing code when text or iCCP is
3308 supported, using PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro.
3309 Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03).
3310 Optimize the zlib CMF byte in non-IDAT compressed chunks
3311
3312 Version 1.5.3beta03 [April 16, 2011]
3313 Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have
3314 snprintf, and the "__STRICT_ANSI__" detects that condition more reliably
3315 than __STDC__ (John Bowler).
3316 Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells
3317 the compiler that a user supplied callback (the error handler) does not
3318 return, yet there is no guarantee in practice that the application code
3319 will correctly implement the error handler because the compiler only
3320 issues a warning if there is a mistake (John Bowler).
3321 Removed the no-longer-used PNG_DEPSTRUCT macro.
3322 Updated the zlib version to 1.2.5 in the VStudio project.
3323 Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in
3324 pngwutil.c (John Bowler).
3325 Fixed bug with stripping the filler or alpha channel when writing, that
3326 was introduced in libpng-1.5.2beta01 (bug report by Andrew Church).
3327
3328 Version 1.5.3beta04 [April 27, 2011]
3329 Updated pngtest.png with the new zlib CMF optimization.
3330 Cleaned up conditional compilation code and of background/gamma handling
3331 Internal changes only except a new option to avoid compiling the
3332 png_build_grayscale_palette API (which is not used at all internally.)
3333 The main change is to move the transform tests (READ_TRANSFORMS,
3334 WRITE_TRANSFORMS) up one level to the caller of the APIs. This avoids
3335 calls to spurious functions if all transforms are disabled and slightly
3336 simplifies those functions. Pngvalid modified to handle this.
3337 A minor change is to stop the strip_16 and expand_16 interfaces from
3338 disabling each other; this allows the future alpha premultiplication
3339 code to use 16-bit intermediate values while still producing 8-bit output.
3340 png_do_background and png_do_gamma have been simplified to take a single
3341 pointer to the png_struct rather than pointers to every item required
3342 from the png_struct. This makes no practical difference to the internal
3343 code.
3344 A serious bug in the pngvalid internal routine 'standard_display_init' has
3345 been fixed - this failed to initialize the red channel and accidentally
3346 initialized the alpha channel twice.
3347 Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to
3348 avoid a possible clash with the png_jmpbuf macro on some platforms.
3349
3350 Version 1.5.3beta05 [May 6, 2011]
3351 Added the "_POSIX_SOURCE" feature test macro to ensure libpng sees the
3352 correct API. _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and
3353 pngvalid.c to ensure that POSIX conformant systems disable non-POSIX APIs.
3354 Removed png_snprintf and added formatted warning messages. This change adds
3355 internal APIs to allow png_warning messages to have parameters without
3356 requiring the host OS to implement snprintf. As a side effect the
3357 dependency of the tIME-supporting RFC1132 code on stdio is removed and
3358 PNG_NO_WARNINGS does actually work now.
3359 Pass "" instead of '\0' to png_default_error() in png_err(). This mistake
3360 was introduced in libpng-1.2.20beta01. This fixes CVE-2011-2691.
3361 Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte
3362 optimization configureable.
3363 IDAT compression failed if preceded by a compressed text chunk (bug
3364 introduced in libpng-1.5.3beta01-02). This was because the attempt to
3365 reset the zlib stream in png_write_IDAT happened after the first IDAT
3366 chunk had been deflated - much too late. In this change internal
3367 functions were added to claim/release the z_stream and, hopefully, make
3368 the code more robust. Also deflateEnd checking is added - previously
3369 libpng would ignore an error at the end of the stream.
3370
3371 Version 1.5.3beta06 [May 8, 2011]
3372 Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
3373 Implemented premultiplied alpha support: png_set_alpha_mode API
3374
3375 Version 1.5.3beta07 [May 11, 2011]
3376 Added expand_16 support to the high level interface.
3377 Added named value and 'flag' gamma support to png_set_gamma. Made a minor
3378 change from the previous (unreleased) ABI/API to hide the exact value used
3379 for Macs - it's not a good idea to embed this in the ABI!
3380 Moved macro definitions for PNG_HAVE_IHDR, PNG_HAVE_PLTE, and PNG_AFTER_IDAT
3381 from pngpriv.h to png.h because they must be visible to applications
3382 that call png_set_unknown_chunks().
3383 Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
3384 before IDAT.
3385
3386 Version 1.5.3beta08 [May 16, 2011]
3387 Improved "pngvalid --speed" to exclude more of pngvalid from the time.
3388 Documented png_set_alpha_mode(), other changes in libpng.3/libpng-manual.txt
3389 The cHRM chunk now sets the defaults for png_set_rgb_to_gray() (when negative
3390 parameters are supplied by the caller), while in the absence of cHRM
3391 sRGB/Rec 709 values are still used. This introduced a divide-by-zero
3392 bug in png_handle_cHRM().
3393 The bKGD chunk no longer overwrites the background value set by
3394 png_set_background(), allowing the latter to be used before the file
3395 header is read. It never performed any useful function to override
3396 the default anyway.
3397 Added memory overwrite and palette image checks to pngvalid.c
3398 Previously palette image code was poorly checked. Since the transformation
3399 code has a special palette path in most cases this was a severe weakness.
3400 Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When
3401 expanding an indexed image, always expand to RGBA if transparency is
3402 present.
3403
3404 Version 1.5.3beta09 [May 17, 2011]
3405 Reversed earlier 1.5.3 change of transformation order; move png_expand_16
3406 back where it was. The change doesn't work because it requires 16-bit
3407 gamma tables when the code only generates 8-bit ones. This fails
3408 silently; the libpng code just doesn't do any gamma correction. Moving
3409 the tests back leaves the old, inaccurate, 8-bit gamma calculations, but
3410 these are clearly better than none!
3411
3412 Version 1.5.3beta10 [May 20, 2011]
3413
3414 png_set_background() and png_expand_16() did not work together correctly.
3415 This problem is present in 1.5.2; if png_set_background is called with
3416 need_expand false and the matching 16 bit color libpng erroneously just
3417 treats it as an 8-bit color because of where png_do_expand_16 is in the
3418 transform list. This simple fix reduces the supplied colour to 8-bits,
3419 so it gets smashed, but this is better than the current behavior.
3420 Added tests for expand16, more fixes for palette image tests to pngvalid.
3421 Corrects the code for palette image tests and disables attempts to
3422 validate palette colors.
3423
3424 Version 1.5.3rc01 [June 3, 2011]
3425 No changes.
3426
3427 Version 1.5.3rc02 [June 8, 2011]
3428 Fixed uninitialized memory read in png_format_buffer() (Bug report by
3429 Frank Busse, CVE-2011-2501, related to CVE-2004-0421).
3430
3431 Version 1.5.3beta11 [June 11, 2011]
3432 Fixed png_handle_sCAL which is broken in 1.5. This fixes CVE 2011-2692.
3433 Added sCAL to pngtest.png
3434 Revised documentation about png_set_user_limits() to say that it also affects
3435 png writing.
3436 Revised handling of png_set_user_limits() so that it can increase the
3437 limit beyond the PNG_USER_WIDTH|HEIGHT_MAX; previously it could only
3438 reduce it.
3439 Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is
3440 wrong (high by one) 25% of the time. Dividing by 257 with rounding is
3441 wrong in 128 out of 65536 cases. Getting the right answer all the time
3442 without division is easy.
3443 Added "_SUPPORTED" to the PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION macro.
3444 Added projects/owatcom, an IDE project for OpenWatcom to replace
3445 scripts/makefile.watcom. This project works with OpenWatcom 1.9. The
3446 IDE autogenerates appropriate makefiles (libpng.mk) for batch processing.
3447 The project is configurable, unlike the Visual Studio project, so long
3448 as the developer has an awk.
3449 Changed png_set_gAMA to limit the gamma value range so that the inverse
3450 of the stored value cannot overflow the fixed point representation,
3451 and changed other things OpenWatcom warns about.
3452 Revised pngvalid.c to test PNG_ALPHA_MODE_SUPPORTED correctly. This allows
3453 pngvalid to build when ALPHA_MODE is not supported, which is required if
3454 it is to build on libpng 1.4.
3455 Removed string/memory macros that are no longer used and are not
3456 necessarily fully supportable, particularly png_strncpy and png_snprintf.
3457 Added log option to pngvalid.c and attempted to improve gamma messages.
3458
3459 Version 1.5.3 [omitted]
3460 People found the presence of a beta release following an rc release
3461 to be confusing; therefore we bump the version to libpng-1.5.4beta01
3462 and there will be no libpng-1.5.3 release.
3463
3464 Version 1.5.4beta01 [June 14, 2011]
3465 Made it possible to undefine PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
3466 to get the same (inaccurate) output as libpng-1.5.2 and earlier.
3467 Moved definitions of PNG_HAVE_IHDR, PNG_AFTER_IDAT, and PNG_HAVE_PLTE
3468 outside of an unknown-chunk block in png.h because they are also
3469 needed for other uses.
3470
3471 Version 1.5.4beta02 [June 14, 2011]
3472 Fixed and clarified LEGACY 16-to-8 scaling code.
3473 Added png_set_chop_16() API, to match inaccurate results from previous
3474 libpng versions.
3475 Removed the ACCURATE and LEGACY options (they are no longer useable)
3476 Use the old scaling method for background if png_set_chop_16() was
3477 called.
3478 Made png_set_chop_16() API removeable by disabling PNG_CHOP_16_TO_8_SUPPORTED
3479
3480 Version 1.5.4beta03 [June 15, 2011]
3481 Fixed a problem in png_do_expand_palette() exposed by optimization in
3482 1.5.3beta06
3483 Also removed a spurious and confusing "trans" member ("trans") from png_info.
3484 The palette expand optimization prevented expansion to an intermediate RGBA
3485 form if tRNS was present but alpha was marked to be stripped; this exposed
3486 a check for tRNS in png_do_expand_palette() which is inconsistent with the
3487 code elsewhere in libpng.
3488 Correction to the expand_16 code; removed extra instance of
3489 png_set_scale_16_to_8 from pngpriv.h
3490
3491 Version 1.5.4beta04 [June 16, 2011]
3492 Added a missing "#ifdef PNG_READ_BACKGROUND_SUPPORTED/#endif" in pngrtran.c
3493 Added PNG_TRANSFORM_CHOP_16 to the high-level read transforms.
3494 Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again. If this is
3495 not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built.
3496 Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8
3497
3498 Version 1.5.4beta05 [June 16, 2011]
3499 Renamed png_set_strip_16() to png_set_scale_16() and renamed
3500 png_set_chop_16() to png_set_strip(16) in an attempt to minimize the
3501 behavior changes between libpng14 and libpng15.
3502
3503 Version 1.5.4beta06 [June 18, 2011]
3504 Fixed new bug that was causing both strip_16 and scale_16 to be applied.
3505
3506 Version 1.5.4beta07 [June 19, 2011]
3507 Fixed pngvalid, simplified macros, added checking for 0 in sCAL.
3508 The ACCURATE scale macro is no longer defined in 1.5 - call the
3509 png_scale_16_to_8 API. Made sure that PNG_READ_16_TO_8 is still defined
3510 if the png_strip_16_to_8 API is present. png_check_fp_number now
3511 maintains some state so that positive, negative and zero values are
3512 identified. sCAL uses these to be strictly spec conformant.
3513
3514 Version 1.5.4beta08 [June 23, 2011]
3515 Fixed pngvalid if ACCURATE_SCALE is defined.
3516 Updated scripts/pnglibconf.h.prebuilt.
3517
3518 Version 1.5.4rc01 [June 30, 2011]
3519 Define PNG_ALLOCATED to "restrict" only if MSC_VER >= 1400.
3520
3521 Version 1.5.4 [July 7, 2011]
3522 No changes.
3523
3524 Version 1.5.5beta01 [July 13, 2011]
3525 Fixed some typos and made other minor changes in the manual.
3526 Updated contrib/pngminus/makefile.std (Samuli Souminen)
3527
3528 Version 1.5.5beta02 [July 14, 2011]
3529 Revised Makefile.am and Makefile.in to look in the right directory for
3530 pnglibconf.h.prebuilt
3531
3532 Version 1.5.5beta03 [July 27, 2011]
3533 Enabled compilation with g++ compiler. This compiler does not recognize
3534 the file extension, so it always compiles with C++ rules. Made minor
3535 changes to pngrutil.c to cast results where C++ expects it but C does not.
3536 Minor editing of libpng.3 and libpng-manual.txt.
3537
3538 Version 1.5.5beta04 [July 29, 2011]
3539 Revised CMakeLists.txt (Clifford Yapp)
3540 Updated commentary about the png_rgb_to_gray() default coefficients
3541 in the manual and in pngrtran.c
3542
3543 Version 1.5.5beta05 [August 17, 2011]
3544 Prevent unexpected API exports from non-libpng DLLs on Windows. The "_DLL"
3545 is removed from the test of whether a DLL is being built (this erroneously
3546 caused the libpng APIs to be marked as DLL exports in static builds under
3547 Microsoft Visual Studio). Almost all of the libpng building configuration
3548 is moved from pngconf.h to pngpriv.h, but PNG_DLL_EXPORT remains in
3549 pngconf.h, though, so that it is colocated with the import definition (it
3550 is no longer used anywhere in the installed headers). The VStudio project
3551 definitions have been cleaned up: "_USRDLL" has been removed from the
3552 static library builds (this was incorrect), and PNG_USE_DLL has been added
3553 to pngvalid to test the functionality (pngtest does not supply it,
3554 deliberately). The spurious "_EXPORTS" has been removed from the
3555 libpng build (all these errors were a result of copy/paste between project
3556 configurations.)
3557 Added new types and internal functions for CIE RGB end point handling to
3558 pngpriv.h (functions yet to be implemented).
3559
3560 Version 1.5.5beta06 [August 26, 2011]
3561 Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set in CMakeLists.txt
3562 (Clifford Yap)
3563 Fixes to rgb_to_gray and cHRM XYZ APIs (John Bowler):
3564 The rgb_to_gray code had errors when combined with gamma correction.
3565 Some pixels were treated as true grey when they weren't and such pixels
3566 and true grey ones were not gamma corrected (the original value of the
3567 red component was used instead). APIs to get and set cHRM using color
3568 space end points have been added and the rgb_to_gray code that defaults
3569 based on cHRM, and the divide-by-zero bug in png_handle_cHRM (CERT
3570 VU#477046, CVE-2011-3328, introduced in 1.5.4) have been corrected.
3571 A considerable number of tests has been added to pngvalid for the
3572 rgb_to_gray transform.
3573 Arithmetic errors in rgb_to_gray whereby the calculated gray value was
3574 truncated to the bit depth rather than rounded have been fixed except in
3575 the 8-bit non-gamma-corrected case (where consistency seems more important
3576 than correctness.) The code still has considerable inaccuracies in the
3577 8-bit case because 8-bit linear arithmetic is used.
3578
3579 Version 1.5.5beta07 [September 7, 2011]
3580 Added "$(ARCH)" option to makefile.darwin
3581 Added SunOS support to configure.ac and Makefile.am
3582 Changed png_chunk_benign_error() to png_warning() in png.c, in
3583 png_XYZ_from_xy_checked().
3584
3585 Version 1.5.5beta08 [September 10, 2011]
3586 Fixed 64-bit compilation errors (gcc). The errors fixed relate
3587 to conditions where types that are 32 bits in the GCC 32-bit
3588 world (uLong and png_size_t) become 64 bits in the 64-bit
3589 world. This produces potential truncation errors which the
3590 compiler correctly flags.
3591 Relocated new HAVE_SOLARIS_LD definition in configure.ac
3592 Constant changes for 64-bit compatibility (removal of L suffixes). The
3593 16-bit cases still use "L" as we don't have a 16-bit test system.
3594
3595 Version 1.5.5rc01 [September 15, 2011]
3596 Removed "L" suffixes in pngpriv.h
3597
3598 Version 1.5.5 [September 22, 2011]
3599 No changes.
3600
3601 Version 1.5.6beta01 [September 22, 2011]
3602 Fixed some 64-bit type conversion warnings in pngrtran.c
3603 Moved row_info from png_struct to a local variable.
3604 The various interlace mask arrays have been made into arrays of
3605 bytes and made PNG_CONST and static (previously some arrays were
3606 marked PNG_CONST and some weren't).
3607 Additional checks have been added to the transform code to validate the
3608 pixel depths after the transforms on both read and write.
3609 Removed some redundant code from pngwrite.c, in png_destroy_write_struct().
3610 Changed chunk reading/writing code to use png_uint_32 instead of png_byte[4].
3611 This removes the need to allocate temporary strings for chunk names on
3612 the stack in the read/write code. Unknown chunk handling still uses the
3613 string form because this is exposed in the API.
3614
3615 Version 1.5.6beta02 [September 26, 2011]
3616 Added a note in the manual the png_read_update_info() must be called only
3617 once with a particular info_ptr.
3618 Fixed a typo in the definition of the new PNG_STRING_FROM_CHUNK(s,c) macro.
3619
3620 Version 1.5.6beta03 [September 28, 2011]
3621 Revised test-pngtest.sh to report FAIL when pngtest fails.
3622 Added "--strict" option to pngtest, to report FAIL when the failure is
3623 only because the resulting valid files are different.
3624 Revised CMakeLists.txt to work with mingw and removed some material from
3625 CMakeLists.txt that is no longer useful in libpng-1.5.
3626
3627 Version 1.5.6beta04 [October 5, 2011]
3628 Fixed typo in Makefile.in and Makefile.am ("-M Wl" should be "-M -Wl")."
3629
3630 Version 1.5.6beta05 [October 12, 2011]
3631 Speed up png_combine_row() for interlaced images. This reduces the generality
3632 of the code, allowing it to be optimized for Adam7 interlace. The masks
3633 passed to png_combine_row() are now generated internally, avoiding
3634 some code duplication and localizing the interlace handling somewhat.
3635 Align png_struct::row_buf - previously it was always unaligned, caused by
3636 a bug in the code that attempted to align it; the code needs to subtract
3637 one from the pointer to take account of the filter byte prepended to
3638 each row.
3639 Optimized png_combine_row() when rows are aligned. This gains a small
3640 percentage for 16-bit and 32-bit pixels in the typical case where the
3641 output row buffers are appropriately aligned. The optimization was not
3642 previously possible because the png_struct buffer was always misaligned.
3643 Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01.
3644
3645 Version 1.5.6beta06 [October 17, 2011]
3646 Removed two redundant tests for unitialized row.
3647 Fixed a relatively harmless memory overwrite in compressed text writing
3648 with a 1 byte zlib buffer.
3649 Add ability to call png_read_update_info multiple times to pngvalid.c.
3650 Fixes for multiple calls to png_read_update_info. These fixes attend to
3651 most of the errors revealed in pngvalid, however doing the gamma work
3652 twice results in inaccuracies that can't be easily fixed. There is now
3653 a warning in the code if this is going to happen.
3654 Turned on multiple png_read_update_info in pngvalid transform tests.
3655 Prevent libpng from overwriting unused bits at the end of the image when
3656 it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would
3657 overwrite the partial byte at the end of each row if the row width was not
3658 an exact multiple of 8 bits and the image is not interlaced.
3659
3660 Version 1.5.6beta07 [October 21, 2011]
3661 Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row
3662 (Mans Rullgard).
3663
3664 Version 1.5.6rc01 [October 26, 2011]
3665 Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM"
3666
3667 Version 1.5.6rc02 [October 27, 2011]
3668 Added LSR() macro to defend against buggy compilers that evaluate non-taken
3669 code branches and complain about out-of-range shifts.
3670
3671 Version 1.5.6rc03 [October 28, 2011]
3672 Renamed the LSR() macro to PNG_LSR() and added PNG_LSL() macro.
3673 Fixed compiler warnings with Intel and MSYS compilers. The logical shift
3674 fix for Microsoft Visual C is required by other compilers, so this
3675 enables that fix for all compilers when using compile-time constants.
3676 Under MSYS 'byte' is a name declared in a system header file, so we
3677 changed the name of a local variable to avoid the warnings that result.
3678 Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h
3679
3680 Version 1.5.6 [November 3, 2011]
3681 No changes.
3682
3683 Version 1.5.7beta01 [November 4, 2011]
3684 Added support for ARM processor, when decoding all PNG up-filtered rows
3685 and any other-filtered rows with 3 or 4 bytes per pixel (Mans Rullgard).
3686 Fixed bug in pngvalid on early allocation failure; fixed type cast in
3687 pngmem.c; pngvalid would attempt to call png_error() if the allocation
3688 of a png_struct or png_info failed. This would probably have led to a
3689 crash. The pngmem.c implementation of png_malloc() included a cast
3690 to png_size_t which would fail on large allocations on 16-bit systems.
3691 Fix for the preprocessor of the Intel C compiler. The preprocessor
3692 splits adjacent @ signs with a space; this changes the concatentation
3693 token from @-@-@ to PNG_JOIN; that should work with all compiler
3694 preprocessors.
3695 Paeth filter speed improvements from work by Siarhei Siamashka. This
3696 changes the 'Paeth' reconstruction function to improve the GCC code
3697 generation on x86. The changes are only part of the suggested ones;
3698 just the changes that definitely improve speed and remain simple.
3699 The changes also slightly increase the clarity of the code.
3700
3701 Version 1.5.7beta02 [November 11, 2011]
3702 Check compression_type parameter in png_get_iCCP and remove spurious
3703 casts. The compression_type parameter is always assigned to, so must
3704 be non-NULL. The cast of the profile length potentially truncated the
3705 value unnecessarily on a 16-bit int system, so the cast of the (byte)
3706 compression type to (int) is specified by ANSI-C anyway.
3707 Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left
3708 the sBIT fields in the test pixel as 0, which resulted in a floating
3709 point division by zero which was irrelevant but causes systems where
3710 FP exceptions cause a crash. Added code to pngvalid to turn on FP
3711 exceptions if the appropriate glibc support is there to ensure this is
3712 tested in the future.
3713 Updated scripts/pnglibconf.mak and scripts/makefile.std to handle the
3714 new PNG_JOIN macro.
3715 Added versioning to pnglibconf.h comments.
3716 Simplified read/write API initial version; basic read/write tested on
3717 a variety of images, limited documentation (in the header file.)
3718 Installed more accurate linear to sRGB conversion tables. The slightly
3719 modified tables reduce the number of 16-bit values that
3720 convert to an off-by-one 8-bit value. The "makesRGB.c" code that was used
3721 to generate the tables is now in a contrib/sRGBtables sub-directory.
3722
3723 Version 1.5.7beta03 [November 17, 2011]
3724 Removed PNG_CONST from the sRGB table declarations in pngpriv.h and png.c
3725 Added run-time detection of NEON support.
3726 Added contrib/libtests; includes simplified API test and timing test and
3727 a color conversion utility for rapid checking of failed 'pngstest' results.
3728 Multiple transform bug fixes plus a work-round for double gamma correction.
3729 libpng does not support more than one transform that requires linear data
3730 at once - if this is tried typically the results is double gamma
3731 correction. Since the simplified APIs can need rgb to gray combined with
3732 a compose operation it is necessary to do one of these outside the main
3733 libpng transform code. This check-in also contains fixes to various bugs
3734 in the simplified APIs themselves and to some bugs in compose and rgb to
3735 gray (on palette) itself.
3736 Fixes for C++ compilation using g++ When libpng source is compiled
3737 using g++. The compiler imposes C++ rules on the C source; thus it
3738 is desireable to make the source work with either C or C++ rules
3739 without throwing away useful error information. This change adds
3740 png_voidcast to allow C semantic (void*) cases or the corresponding
3741 C++ static_cast operation, as appropriate.
3742 Added --noexecstack to assembler file compilation. GCC does not set
3743 this on assembler compilation, even though it does on C compilation.
3744 This creates security issues if assembler code is enabled; the
3745 work-around is to set it by default in the flags for $(CCAS)
3746 Work around compilers that don't support declaration of const data. Some
3747 compilers fault 'extern const' data declarations (because the data is
3748 not initialized); this turns on const-ness only for compilers where
3749 this is known to work.
3750
3751 Version 1.5.7beta04 [November 17, 2011]
3752 Since the gcc driver does not recognize the --noexecstack flag, we must
3753 use the -Wa prefix to have it passed through to the assembler.
3754 Also removed a duplicate setting of this flag.
3755 Added files that were omitted from the libpng-1.5.7beta03 zip distribution.
3756
3757 Version 1.5.7beta05 [November 25, 2011]
3758 Removed "zTXt" from warning in generic chunk decompression function.
3759 Validate time settings passed to png_set_tIME() and png_convert_to_rfc1123()
3760 (Frank Busse). Note: This prevented CVE-2015-7981 from affecting
3761 libpng-1.5.7 and later.
3762 Added MINGW support to CMakeLists.txt
3763 Reject invalid compression flag or method when reading the iTXt chunk.
3764 Backed out 'simplified' API changes. The API seems too complex and there
3765 is a lack of consensus or enthusiasm for the proposals. The API also
3766 reveals significant bugs inside libpng (double gamma correction and the
3767 known bug of being unable to retrieve a corrected palette). It seems
3768 better to wait until the bugs, at least, are corrected.
3769 Moved pngvalid.c into contrib/libtests
3770 Rebuilt Makefile.in, configure, etc., with autoconf-2.68
3771
3772 Version 1.5.7rc01 [December 1, 2011]
3773 Replaced an "#if" with "#ifdef" in pngrtran.c
3774 Revised #if PNG_DO_BC block in png.c (use #ifdef and add #else)
3775
3776 Version 1.5.7rc02 [December 5, 2011]
3777 Revised project files and contrib/pngvalid/pngvalid.c to account for
3778 the relocation of pngvalid into contrib/libtests.
3779 Revised pngconf.h to use " __declspec(restrict)" only when MSC_VER >= 1400,
3780 as in libpng-1.5.4.
3781 Put CRLF line endings in the owatcom project files.
3782
3783 Version 1.5.7rc03 [December 7, 2011]
3784 Updated CMakeLists.txt to account for the relocation of pngvalid.c
3785
3786 Version 1.5.7 [December 15, 2011]
3787 Minor fixes to pngvalid.c for gcc 4.6.2 compatibility to remove warnings
3788 reported by earlier versions.
3789 Fixed minor memset/sizeof errors in pngvalid.c.
3790
3791 Version 1.6.0beta01 [December 15, 2011]
3792 Removed machine-generated configure files from the GIT repository (they will
3793 continue to appear in the tarball distributions and in the libpng15 and
3794 earlier GIT branches).
3795 Restored the new 'simplified' API, which was started in libpng-1.5.7beta02
3796 but later deleted from libpng-1.5.7beta05.
3797 Added example programs for the new 'simplified' API.
3798 Added ANSI-C (C90) headers and require them, and take advantage of the
3799 change. Also fixed some of the projects/* and contrib/* files that needed
3800 updates for libpng16 and the move of pngvalid.c.
3801 With this change the required ANSI-C header files are assumed to exist: the
3802 implementation must provide float.h, limits.h, stdarg.h and stddef.h and
3803 libpng relies on limits.h and stddef.h existing and behaving as defined
3804 (the other two required headers aren't used). Non-ANSI systems that don't
3805 have stddef.h or limits.h will have to provide an appropriate fake
3806 containing the relevant types and #defines.
3807 Dropped support for 16-bit platforms. The use of FAR/far has been eliminated
3808 and the definition of png_alloc_size_t is now controlled by a flag so
3809 that 'small size_t' systems can select it if necessary. Libpng 1.6 may
3810 not currently work on such systems -- it seems likely that it will
3811 ask 'malloc' for more than 65535 bytes with any image that has a
3812 sufficiently large row size (rather than simply failing to read such
3813 images).
3814 New tools directory containing tools used to generate libpng code.
3815 Fixed race conditions in parallel make builds. With higher degrees of
3816 parallelism during 'make' the use of the same temporary file names such
3817 as 'dfn*' can result in a race where a temporary file from one arm of the
3818 build is deleted or overwritten in another arm. This changes the
3819 temporary files for suffix rules to always use $* and ensures that the
3820 non-suffix rules use unique file names.
3821
3822 Version 1.6.0beta02 [December 21, 2011]
3823 Correct configure builds where build and source directories are separate.
3824 The include path of 'config.h' was erroneously made relative in pngvalid.c
3825 in libpng 1.5.7.
3826
3827 Version 1.6.0beta03 [December 22, 2011]
3828 Start-up code size improvements, error handler flexibility. These changes
3829 alter how the tricky allocation of the initial png_struct and png_info
3830 structures are handled. png_info is now handled in pretty much the same
3831 way as everything else, except that the allocations handle NULL return
3832 silently. png_struct is changed in a similar way on allocation and on
3833 deallocation a 'safety' error handler is put in place (which should never
3834 be required). The error handler itself is changed to permit mismatches
3835 in the application and libpng error buffer size; however, this means a
3836 silent change to the API to return the jmp_buf if the size doesn't match
3837 the size from the libpng compilation; libpng now allocates the memory and
3838 this may fail. Overall these changes result in slight code size
3839 reductions; however, this is a reduction in code that is always executed
3840 so is particularly valuable. Overall on a 64-bit system the libpng DLL
3841 decreases in code size by 1733 bytes. pngerror.o increases in size by
3842 about 465 bytes because of the new functionality.
3843 Added png_convert_to_rfc1123_buffer() and deprecated png_convert_to_rfc1123()
3844 to avoid including a spurious buffer in the png_struct.
3845
3846 Version 1.6.0beta04 [December 30, 2011]
3847 Regenerated configure scripts with automake-1.11.2
3848 Eliminated png_info_destroy(). It is now used only in png.c and only calls
3849 one other internal function and memset().
3850 Enabled png_get_sCAL_fixed() if floating point APIs are enabled. Previously
3851 it was disabled whenever internal fixed point arithmetic was selected,
3852 which meant it didn't exist even on systems where FP was available but not
3853 preferred.
3854 Added pngvalid.c compile time checks for const APIs.
3855 Implemented 'restrict' for png_info and png_struct. Because of the way
3856 libpng works both png_info and png_struct are always accessed via a
3857 single pointer. This means adding C99 'restrict' to the pointer gives
3858 the compiler some opportunity to optimize the code. This change allows
3859 that.
3860 Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper
3861 location in configure.ac (Gilles Espinasse).
3862 Changed png_memcpy to C assignment where appropriate. Changed all those
3863 uses of png_memcpy that were doing a simple assignment to assignments
3864 (all those cases where the thing being copied is a non-array C L-value).
3865 Added some error checking to png_set_*() routines.
3866 Removed the reference to the non-exported function png_memcpy() from
3867 example.c.
3868 Fixed the Visual C 64-bit build - it requires jmp_buf to be aligned, but
3869 it had become misaligned.
3870 Revised contrib/pngminus/pnm2png.c to avoid warnings when png_uint_32
3871 and unsigned long are of different sizes.
3872
3873 Version 1.6.0beta05 [January 15, 2012]
3874 Updated manual with description of the simplified API (copied from png.h)
3875 Fix bug in pngerror.c: some long warnings were being improperly truncated
3876 (CVE-2011-3464, bug introduced in libpng-1.5.3beta05).
3877
3878 Version 1.6.0beta06 [January 24, 2012]
3879 Added palette support to the simplified APIs. This commit
3880 changes some of the macro definitions in png.h, app code
3881 may need corresponding changes.
3882 Increased the formatted warning buffer to 192 bytes.
3883 Added color-map support to simplified API. This is an initial version for
3884 review; the documentation has not yet been updated.
3885 Fixed Min/GW uninstall to remove libpng.dll.a
3886
3887 Version 1.6.0beta07 [January 28, 2012]
3888 Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived)
3889 compiler issues slightly different warnings from those issued by the
3890 current vesions of GCC. This eliminates those warnings by
3891 adding/removing casts and small code rewrites.
3892 Updated configure.ac from autoupdate: added --enable-werror option.
3893 Also some layout regularization and removal of introduced tab characters
3894 (replaced with 3-character indentation). Obsolete macros identified by
3895 autoupdate have been removed; the replacements are all in 2.59 so
3896 the pre-req hasn't been changed. --enable-werror checks for support
3897 for -Werror (or the given argument) in the compiler. This mimics the
3898 gcc configure option by allowing -Werror to be turned on safely; without
3899 the option the tests written in configure itself fail compilation because
3900 they cause compiler warnings.
3901 Rewrote autogen.sh to run autoreconf instead of running tools one-by-one.
3902 Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt and
3903 set CMAKE_LIBRARY_OUTPUT_DIRECTORY to "lib" on all platforms (C. Yapp).
3904 Freeze libtool files in the 'scripts' directory. This version of autogen.sh
3905 attempts to dissuade people from running it when it is not, or should not,
3906 be necessary. In fact, autogen.sh does not work when run in a libpng
3907 directory extracted from a tar distribution anymore. You must run it in
3908 a GIT clone instead.
3909 Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
3910 and renamed three whose names were inconsistent with those in
3911 pngsuite/README.txt.
3912
3913 Version 1.6.0beta08 [February 1, 2012]
3914 Fixed Image::colormap misalignment in pngstest.c
3915 Check libtool/libtoolize version number (2.4.2) in configure.ac
3916 Divide test-pngstest.sh into separate pngstest runs for basic and
3917 transparent images.
3918 Moved automake options to AM_INIT_AUTOMAKE in configure.ac
3919 Added color-tests, silent-rules (Not yet implemented in Makefile.am) and
3920 version checking to configure.ac
3921 Improved pngstest speed by not doing redundant tests and add const to
3922 the background parameter of png_image_finish_read. The --background
3923 option is now done automagically only when required, so that commandline
3924 option no longer exists.
3925 Cleaned up pngpriv.h to consistently declare all functions and data.
3926 Also eliminated PNG_CONST_DATA, which is apparently not needed but we
3927 can't be sure until it is gone.
3928 Added symbol prefixing that allows all the libpng external symbols
3929 to be prefixed (suggested by Reuben Hawkins).
3930 Updated "ftbb*.png" list in the owatcom and vstudio projects.
3931 Fixed 'prefix' builds on clean systems. The generation of pngprefix.h
3932 should not require itself.
3933 Updated INSTALL to explain that autogen.sh must be run in a GIT clone,
3934 not in a libpng directory extracted from a tar distribution.
3935
3936 Version 1.6.0beta09 [February 1, 2012]
3937 Reverted the prebuilt configure files to libpng-1.6.0beta05 condition.
3938
3939 Version 1.6.0beta10 [February 3, 2012]
3940 Added Z_SOLO for zlib-1.2.6+ and correct pngstest tests
3941 Updated list of test images in CMakeLists.txt
3942 Updated the prebuilt configure files to current condition.
3943 Revised INSTALL information about autogen.sh; it works in tar distributions.
3944
3945 Version 1.6.0beta11 [February 16, 2012]
3946 Fix character count in pngstest command in projects/owatcom/pngstest.tgt
3947 Revised test-pngstest.sh to report PASS/FAIL for each image.
3948 Updated documentation about the simplified API.
3949 Corrected estimate of error in libpng png_set_rgb_to_gray API. The API is
3950 extremely inaccurate for sRGB conversions because it uses an 8-bit
3951 intermediate linear value and it does not use the sRGB transform, so it
3952 suffers from the known instability in gamma transforms for values close
3953 to 0 (see Poynton). The net result is that the calculation has a maximum
3954 error of 14.99/255; 0.5/255^(1/2.2). pngstest now uses 15 for the
3955 permitted 8-bit error. This may still not be enough because of arithmetic
3956 error.
3957 Removed some unused arrays (with #ifdef) from png_read_push_finish_row().
3958 Fixed a memory overwrite bug in simplified read of RGB PNG with
3959 non-linear gamma Also bugs in the error checking in pngread.c and changed
3960 quite a lot of the checks in pngstest.c to be correct; either correctly
3961 written or not over-optimistic. The pngstest changes are insufficient to
3962 allow all possible RGB transforms to be passed; pngstest cmppixel needs
3963 to be rewritten to make it clearer which errors it allows and then changed
3964 to permit known inaccuracies.
3965 Removed tests for no-longer-used *_EMPTY_PLTE_SUPPORTED from pngstruct.h
3966 Fixed fixed/float API export conditionals. 1) If FIXED_POINT or
3967 FLOATING_POINT options were switched off, png.h ended up with lone ';'
3968 characters. This is not valid ANSI-C outside a function. The ';'
3969 characters have been moved inside the definition of PNG_FP_EXPORT and
3970 PNG_FIXED_EXPORT. 2) If either option was switched off, the declaration
3971 of the corresponding functions were completely omitted, even though some
3972 of them are still used internally. The result is still valid, but
3973 produces warnings from gcc with some warning options (including -Wall). The
3974 fix is to cause png.h to declare the functions with PNG_INTERNAL_FUNCTION
3975 when png.h is included from pngpriv.h.
3976 Check for invalid palette index while reading paletted PNG. When one is
3977 found, issue a warning and increase png_ptr->num_palette accordingly.
3978 Apps are responsible for checking to see if that happened.
3979
3980 Version 1.6.0beta12 [February 18, 2012]
3981 Do not increase num_palette on invalid_index.
3982 Relocated check for invalid palette index to pngrtran.c, after unpacking
3983 the sub-8-bit pixels.
3984 Fixed CVE-2011-3026 buffer overrun bug. This bug was introduced when
3985 iCCP chunk support was added at libpng-1.0.6. Deal more correctly with the
3986 test on iCCP chunk length. Also removed spurious casts that may hide
3987 problems on 16-bit systems.
3988
3989 Version 1.6.0beta13 [February 24, 2012]
3990 Eliminated redundant png_push_read_tEXt|zTXt|iTXt|unknown code from
3991 pngpread.c and use the sequential png_handle_tEXt, etc., in pngrutil.c;
3992 now that png_ptr->buffer is inaccessible to applications, the special
3993 handling is no longer useful.
3994 Added PNG_SAFE_LIMITS feature to pnglibconf.dfa, pngpriv.h, and new
3995 pngusr.dfa to reset the user limits to safe ones if PNG_SAFE_LIMITS is
3996 defined. To enable, use "CPPFLAGS=-DPNG_SAFE_LIMITS_SUPPORTED=1" on the
3997 configure command or put #define PNG_SAFE_LIMITS_SUPPORTED in
3998 pnglibconf.h.prebuilt and pnglibconf.h.
3999
4000 Version 1.6.0beta14 [February 27, 2012]
4001 Added information about the new limits in the manual.
4002 Updated Makefile.in
4003
4004 Version 1.6.0beta15 [March 2, 2012]
4005 Removed unused "current_text" members of png_struct and the png_free()
4006 of png_ptr->current_text from pngread.c
4007 Rewrote pngstest.c for substantial speed improvement.
4008 Fixed transparent pixel and 16-bit rgb tests in pngstest and removed a
4009 spurious check in pngwrite.c
4010 Added PNG_IMAGE_FLAG_FAST for the benefit of applications that store
4011 intermediate files, or intermediate in-memory data, while processing
4012 image data with the simplified API. The option makes the files larger
4013 but faster to write and read. pngstest now uses this by default; this
4014 can be disabled with the --slow option.
4015 Improved pngstest fine tuning of error numbers, new test file generator.
4016 The generator generates images that test the full range of sample values,
4017 allow the error numbers in pngstest to be tuned and checked. makepng
4018 also allows generation of images with extra chunks, although this is
4019 still work-in-progress.
4020 Added check for invalid palette index while reading.
4021 Fixed some bugs in ICC profile writing. The code should now accept
4022 all potentially valid ICC profiles and reject obviously invalid ones.
4023 It now uses png_error() to do so rather than casually writing a PNG
4024 without the necessary color data.
4025 Removed whitespace from the end of lines in all source files and scripts.
4026
4027 Version 1.6.0beta16 [March 6, 2012]
4028 Relocated palette-index checking function from pngrutil.c to pngtrans.c
4029 Added palette-index checking while writing.
4030 Changed png_inflate() and calling routines to avoid overflow problems.
4031 This is an intermediate check-in that solves the immediate problems and
4032 introduces one performance improvement (avoiding a copy via png_ptr->zbuf.)
4033 Further changes will be made to make ICC profile handling more secure.
4034 Fixed build warnings (MSVC, GCC, GCC v3). Cygwin GCC with default options
4035 declares 'index' as a global, causing a warning if it is used as a local
4036 variable. GCC 64-bit warns about assigning a (size_t) (unsigned 64-bit)
4037 to an (int) (signed 32-bit). MSVC, however, warns about using the
4038 unary '-' operator on an unsigned value (even though it is well defined
4039 by ANSI-C to be ~x+1). The padding calculation was changed to use a
4040 different method. Removed the tests on png_ptr->pass.
4041 Added contrib/libtests/tarith.c to test internal arithmetic functions from
4042 png.c. This is a libpng maintainer program used to validate changes to the
4043 internal arithmetic functions.
4044 Made read 'inflate' handling like write 'deflate' handling. The read
4045 code now claims and releases png_ptr->zstream, like the write code.
4046 The bug whereby the progressive reader failed to release the zstream
4047 is now fixed, all initialization is delayed, and the code checks for
4048 changed parameters on deflate rather than always calling
4049 deflatedEnd/deflateInit.
4050 Validate the zTXt strings in pngvalid.
4051 Added code to validate the windowBits value passed to deflateInit2().
4052 If the call to deflateInit2() is wrong a png_warning will be issued
4053 (in fact this is harmless, but the PNG data produced may be sub-optimal).
4054
4055 Version 1.6.0beta17 [March 10, 2012]
4056 Fixed PNG_LIBPNG_BUILD_BASE_TYPE definition.
4057 Reject all iCCP chunks after the first, even if the first one is invalid.
4058 Deflate/inflate was reworked to move common zlib calls into single
4059 functions [rw]util.c. A new shared keyword check routine was also added
4060 and the 'zbuf' is no longer allocated on progressive read. It is now
4061 possible to call png_inflate() incrementally. A warning is no longer
4062 issued if the language tag or translated keyword in the iTXt chunk
4063 has zero length.
4064 If benign errors are disabled use maximum window on ancilliary inflate.
4065 This works round a bug introduced in 1.5.4 where compressed ancillary
4066 chunks could end up with a too-small windowBits value in the deflate
4067 header.
4068
4069 Version 1.6.0beta18 [March 16, 2012]
4070 Issue a png_benign_error() instead of png_warning() about bad palette index.
4071 In pngtest, treat benign errors as errors if "-strict" is present.
4072 Fixed an off-by-one error in the palette index checking function.
4073 Fixed a compiler warning under Cygwin (Windows-7, 32-bit system)
4074 Revised example.c to put text strings in a temporary character array
4075 instead of directly assigning string constants to png_textp members.
4076 This avoids compiler warnings when -Wwrite-strings is enabled.
4077 Added output flushing to aid debugging under Visual Studio. Unfortunately
4078 this is necessary because the VS2010 output window otherwise simply loses
4079 the error messages on error (they weren't flushed to the window before
4080 the process exited, apparently!)
4081 Added configuration support for benign errors and changed the read
4082 default. Also changed some warnings in the iCCP and sRGB handling
4083 from to benign errors. Configuration now makes read benign
4084 errors warnings and write benign errors to errors by default (thus
4085 changing the behavior on read). The simplified API always forces
4086 read benign errors to warnings (regardless of the system default, unless
4087 this is disabled in which case the simplified API can't be built.)
4088
4089 Version 1.6.0beta19 [March 18, 2012]
4090 Work around for duplicate row start calls; added warning messages.
4091 This turns on PNG_FLAG_DETECT_UNINITIALIZED to detect app code that
4092 fails to call one of the 'start' routines (not enabled in libpng-1.5
4093 because it is technically an API change, since it did normally work
4094 before.) It also makes duplicate calls to png_read_start_row (an
4095 internal function called at the start of the image read) benign, as
4096 they were before changes to use png_inflate_claim. Somehow webkit is
4097 causing this to happen; this is probably a mis-feature in the zlib
4098 changes so this commit is only a work-round.
4099 Removed erroneous setting of DETECT_UNINITIALIZED and added more
4100 checks. The code now does a png_error if an attempt is made to do the
4101 row initialization twice; this is an application error and it has
4102 serious consequences because the transform data in png_struct is
4103 changed by each call.
4104 Added application error reporting and added chunk names to read
4105 benign errors; also added --strict to pngstest - not enabled
4106 yet because a warning is produced.
4107 Avoid the double gamma correction warning in the simplified API.
4108 This allows the --strict option to pass in the pngstest checks
4109
4110 Version 1.6.0beta20 [March 29, 2012]
4111 Changed chunk handler warnings into benign errors, incrementally load iCCP
4112 Added checksum-icc.c to contrib/tools
4113 Prevent PNG_EXPAND+PNG_SHIFT doing the shift twice.
4114 Recognize known sRGB ICC profiles while reading; prefer writing the
4115 iCCP profile over writing the sRGB chunk, controlled by the
4116 PNG_sRGB_PROFILE_CHECKS option.
4117 Revised png_set_text_2() to avoid potential memory corruption (fixes
4118 CVE-2011-3048, also known as CVE-2012-3425).
4119
4120 Version 1.6.0beta21 [April 27, 2012]
4121 Revised scripts/makefile.darwin: use system zlib; remove quotes around
4122 architecture list; add missing ppc architecture; add architecture options
4123 to shared library link; don't try to create a shared lib based on missing
4124 RELEASE variable.
4125 Enable png_set_check_for_invalid_index() for both read and write.
4126 Removed #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED in pngpriv.h around
4127 declaration of png_handle_unknown().
4128 Added -lssp_nonshared in a comment in scripts/makefile.freebsd
4129 and changed deprecated NOOBJ and NOPROFILE to NO_OBJ and NO_PROFILE.
4130
4131 Version 1.6.0beta22 [May 23, 2012]
4132 Removed need for -Wno-cast-align with clang. clang correctly warns on
4133 alignment increasing pointer casts when -Wcast-align is passed. This
4134 fixes the cases that clang warns about either by eliminating the
4135 casts from png_bytep to png_uint_16p (pngread.c), or, for pngrutil.c
4136 where the cast is previously verified or pngstest.c where it is OK, by
4137 introducing new png_aligncast macros to do the cast in a way that clang
4138 accepts.
4139
4140 Version 1.6.0beta23 [June 6, 2012]
4141 Revised CMakeLists.txt to not attempt to make a symlink under mingw.
4142 Made fixes for new optimization warnings from gcc 4.7.0. The compiler
4143 performs an optimization which is safe; however it then warns about it.
4144 Changing the type of 'palette_number' in pngvalid.c removes the warning.
4145 Do not depend upon a GCC feature macro being available for use in generating
4146 the linker mapfile symbol prefix.
4147 Improved performance of new do_check_palette_indexes() function (only
4148 update the value when it actually increases, move test for whether
4149 the check is wanted out of the function.
4150
4151 Version 1.6.0beta24 [June 7, 2012]
4152 Don't check palette indexes if num_palette is 0 (as it can be in MNG files).
4153
4154 Version 1.6.0beta25 [June 16, 2012]
4155 Revised png_set_keep_unknown_chunks() so num_chunks < 0 means ignore all
4156 unknown chunks and all known chunks except for IHDR, PLTE, tRNS, IDAT,
4157 and IEND. Previously it only meant ignore all unknown chunks, the
4158 same as num_chunks == 0. Revised png_image_skip_unused_chunks() to
4159 provide a list of chunks to be processed instead of a list of chunks to
4160 ignore. Revised contrib/gregbook/readpng2.c accordingly.
4161
4162 Version 1.6.0beta26 [July 10, 2012]
4163 Removed scripts/makefile.cegcc from the *.zip and *.7z distributions; it
4164 depends on configure, which is not included in those archives.
4165 Moved scripts/chkfmt to contrib/tools.
4166 Changed "a+w" to "u+w" in Makefile.in to fix CVE-2012-3386.
4167
4168 Version 1.6.0beta27 [August 11, 2012]
4169 Do not compile PNG_DEPRECATED, PNG_ALLOC and PNG_PRIVATE when __GNUC__ < 3.
4170 Do not use __restrict when GNUC is <= 3.1
4171 Removed references to png_zalloc() and png_zfree() from the manual.
4172 Fixed configurations where floating point is completely disabled. Because
4173 of the changes to support symbol prefixing PNG_INTERNAL_FUNCTION declares
4174 floating point APIs during libpng builds even if they are completely
4175 disabled. This requires the png floating point types (png_double*) to be
4176 declared even though the functions are never actually defined. This
4177 change provides a dummy definition so that the declarations work, yet any
4178 implementation will fail to compile because of an incomplete type.
4179 Re-eliminated the use of strcpy() in pngtest.c. An unncessary use of
4180 strcpy() was accidentally re-introduced in libpng16; this change replaces
4181 it with strncpy().
4182 Eliminated use of png_sizeof(); use sizeof() instead.
4183 Use a consistent style for (sizeof type) and (sizeof (array))
4184 Cleanup of png_set_filler(). This function does very different things on
4185 read and write. In libpng 1.6 the two cases can be distinguished and
4186 considerable code cleanup, and extra error checking, is possible. This
4187 makes calls on the write side that have no effect be ignored with a
4188 png_app_error(), which can be disabled in the app using
4189 png_set_benign_errors(), and removes the spurious use of usr_channels
4190 on the read side.
4191 Insist on autotools 1.12.1 for git builds because there are security issues
4192 with 1.12 and insisting on anything less would allow 1.12 to be used.
4193 Removed info_ptr->signature[8] from WRITE-only builds.
4194 Add some conditions for compiling png_fixed(). This is a small function
4195 but it requires "-lm" on some platforms.
4196 Cause pngtest --strict to fail on any warning from libpng (not just errors)
4197 and cause it not to fail at the comparison step if libpng lacks support
4198 for writing chunks that it reads from the input (currently only implemented
4199 for compressed text chunks).
4200 Make all three "make check" test programs work without READ or WRITE support.
4201 Now "make check" will succeed even if libpng is compiled with -DPNG_NO_READ
4202 or -DPNG_NO_WRITE. The tests performed are reduced, but the basic reading
4203 and writing of a PNG file is always tested by one or more of the tests.
4204 Consistently use strlen(), memset(), memcpy(), and memcmp() instead of the
4205 png_strlen(), png_memset(), png_memcpy(), and png_memcmp() macros.
4206 Removed the png_sizeof(), png_strlen(), png_memset(), png_memcpy(), and
4207 png_memcmp() macros.
4208 Work around gcc 3.x and Microsoft Visual Studio 2010 complaints. Both object
4209 to the split initialization of num_chunks.
4210
4211 Version 1.6.0beta28 [August 29, 2012]
4212 Unknown handling fixes and clean up. This adds more correct option
4213 control of the unknown handling, corrects the pre-existing bug where
4214 the per-chunk 'keep' setting is ignored and makes it possible to skip
4215 IDAT chunks in the sequential reader (broken in earlier 1.6 versions).
4216 There is a new test program, test-unknown.c, which is a work in progress
4217 (not currently part of the test suite). Comments in the header files now
4218 explain how the unknown handling works.
4219 Allow fine grain control of unknown chunk APIs. This change allows
4220 png_set_keep_unknown_chunks() to be turned off if not required and causes
4221 both read and write to behave appropriately (on read this is only possible
4222 if the user callback is used to handle unknown chunks). The change
4223 also removes the support for storing unknown chunks in the info_struct
4224 if the only unknown handling enabled is via the callback, allowing libpng
4225 to be configured with callback reading and none of the unnecessary code.
4226 Corrected fix for unknown handling in pngtest. This reinstates the
4227 libpng handling of unknown chunks other than vpAg and sTER (including
4228 unsafe-to-copy chunks which were dropped before) and eliminates the
4229 repositioning of vpAg and sTER in pngtest.png by changing pngtest.png
4230 (so the chunks are where libpng would put them).
4231 Added "tunknown" test and corrected a logic error in png_handle_unknown()
4232 when SAVE support is absent. Moved the shell test scripts for
4233 contrib/libtests from the libpng top directory to contrib/libtests.
4234 png_handle_unknown() must always read or skip the chunk, if
4235 SAVE_UNKNOWN_CHUNKS is turned off *and* the application does not set
4236 a user callback an unknown chunk will not be read, leading to a read
4237 error, which was revealed by the "tunknown" test.
4238 Cleaned up and corrected ICC profile handling.
4239 contrib/libtests/makepng: corrected 'rgb' and 'gray' cases. profile_error
4240 messages could be truncated; made a correct buffer size calculation and
4241 adjusted pngerror.c appropriately. png_icc_check_* checking improved;
4242 changed the functions to receive the correct color type of the PNG on read
4243 or write and check that it matches the color space of the profile (despite
4244 what the comments said before, there is danger in assuming the app will
4245 cope correctly with an RGB profile on a grayscale image and, since it
4246 violates the PNG spec, allowing it is certain to produce inconsistent
4247 app behavior and might even cause app crashes.) Check that profiles
4248 contain the tags needed to process the PNG (tags all required by the ICC
4249 spec). Removed unused PNG_STATIC from pngpriv.h.
4250
4251 Version 1.6.0beta29 [September 4, 2012]
4252 Fixed the simplified API example programs to add the *colormap parameter
4253 to several of he API and improved the error message if the version field
4254 is not set.
4255 Added contrib/examples/* to the *.zip and *.7z distributions.
4256 Updated simplified API synopses and description of the png_image structure
4257 in the manual.
4258 Made makepng and pngtest produce identical PNGs, add "--relaxed" option
4259 to pngtest. The "--relaxed" option turns off the benign errors that are
4260 enabled by default in pre-RC builds. makepng can now write ICC profiles
4261 where the length has not been extended to a multiple of 4, and pngtest
4262 now intercepts all libpng errors, allowing the previously-introduced
4263 "--strict test" on no warnings to actually work.
4264 Improved ICC profile handling including cHRM chunk generation and fixed
4265 Cygwin+MSVC build errors. The ICC profile handling now includes more
4266 checking. Several errors that caused rejection of the profile are now
4267 handled with a warning in such a way that the invalid profiles will be
4268 read by default in release (but not pre-RC) builds but will not be
4269 written by default. The easy part of handling the cHRM chunk is written,
4270 where the ICC profile contains the required data. The more difficult
4271 part plus guessing a gAMA value requires code to pass selected RGB values
4272 through the profile.
4273
4274 Version 1.6.0beta30 [October 24, 2012]
4275 Changed ICC profile matrix/vector types to not depend on array type rules.
4276 By the ANSI-C standard the new types should be identical to the previous
4277 versions, and all known versions of gcc tested with the previous versions
4278 except for GCC-4.2.1 work with this version. The change makes the ANSI-C
4279 rule that const applied to an array of elements applies instead to the
4280 elements in the array moot by explicitly applying const to the base
4281 elements of the png_icc_matrix and png_icc_vector types. The accidental
4282 (harmless) 'const' previously applied to the parameters of two of the
4283 functions have also been removed.
4284 Added a work around for GCC 4.2 optimization bug.
4285 Marked the broken (bad white point) original HP sRGB profiles correctly and
4286 correct comments.
4287 Added -DZ_SOLO to contrib/pngminim/*/makefile to work with zlib-1.2.7
4288 Use /MDd for vstudio debug builds. Also added pngunkown to the vstudio
4289 builds, fixed build errors and corrected a minor exit code error in
4290 pngvalid if the 'touch' file name is invalid.
4291 Add updated WARNING file to projects/vstudio from libpng 1.5/vstudio
4292 Fixed build when using #define PNG_NO_READ_GAMMA in png_do_compose() in
4293 pngrtran.c (Domani Hannes).
4294
4295 Version 1.6.0beta31 [November 1, 2012]
4296 Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30.
4297 Made pngvalid so that it will build outside the libpng source tree.
4298 Made builds -DPNG_NO_READ_GAMMA compile (the unit tests still fail).
4299 Made PNG_NO_READ_GAMMA switch off interfaces that depend on READ_GAMMA.
4300 Prior to 1.6.0 switching off READ_GAMMA did unpredictable things to the
4301 interfaces that use it (specifically, png_do_background in 1.4 would
4302 simply display composite for grayscale images but do composition
4303 with the incorrect arithmetic for color ones). In 1.6 the semantic
4304 of -DPNG_NO_READ_GAMMA is changed to simply disable any interface that
4305 depends on it; this obliges people who set it to consider whether they
4306 really want it off if they happen to use any of the interfaces in
4307 question (typically most users who disable it won't).
4308 Fixed GUIDs in projects/vstudio. Some were duplicated or missing,
4309 resulting in VS2010 having to update the files.
4310 Removed non-working ICC profile support code that was mostly added to
4311 libpng-1.6.0beta29 and beta30. There was too much code for too little
4312 gain; implementing full ICC color correction may be desireable but is left
4313 up to applications.
4314
4315 Version 1.6.0beta32 [November 25, 2012]
4316 Fixed an intermittent SEGV in pngstest due to an uninitialized array element.
4317 Added the ability for contrib/libtests/makepng.c to make a PNG with just one
4318 color. This is useful for debugging pngstest color inaccuracy reports.
4319 Fixed error checking in the simplified write API (Olaf van der Spek)
4320 Made png_user_version_check() ok to use with libpng version 1.10.x and later.
4321
4322 Version 1.6.0beta33 [December 15, 2012]
4323 Fixed typo in png.c (PNG_SET_CHUNK_MALLOC_MAX should be PNG_CHUNK_MALLOC_MAX)
4324 that causes the MALLOC_MAX limit not to work (John Bowler)
4325 Change png_warning() to png_app_error() in pngwrite.c and comment the
4326 fall-through condition.
4327 Change png_warning() to png_app_warning() in png_write_tRNS().
4328 Rearranged the ARM-NEON optimizations: Isolated the machine specific code
4329 to the hardware subdirectory and added comments to pngrutil.c so that
4330 implementors of other optimizations know what to do.
4331 Fixed cases of unquoted DESTDIR in Makefile.am
4332 Rebuilt Makefile.in, etc., with autoconf-2.69 and automake-1.12.5.
4333
4334 Version 1.6.0beta34 [December 19, 2012]
4335 Cleaned up whitespace in the synopsis portion of the manpage "libpng.3"
4336 Disassembled the version number in scripts/options.awk (necessary for
4337 building on SunOs).
4338
4339 Version 1.6.0beta35 [December 23, 2012]
4340 Made default Zlib compression settings be configurable. This adds #defines to
4341 pnglibconf.h to control the defaults.
4342 Fixed Windows build issues, enabled ARM compilation. Various warnings issued
4343 by earlier versions of GCC fixed for Cygwin and Min/GW (which both use old
4344 GCCs.) ARM support is enabled by default in zlib.props (unsupported by
4345 Microsoft) and ARM compilation is made possible by deleting the check for
4346 x86. The test programs cannot be run because they are not signed.
4347
4348 Version 1.6.0beta36 [January 2, 2013]
4349 Discontinued distributing libpng-1.x.x.tar.bz2.
4350 Discontinued distributing libpng-1.7.0-1.6.0-diff.txt and similar.
4351 Rebuilt configure with autoconf-2.69 (inadvertently not done in beta33)
4352 Fixed 'make distcheck' on SUN OS - libpng.so was not being removed
4353
4354 Version 1.6.0beta37 [January 10, 2013]
4355 Fixed conceivable but difficult to repro overflow. Also added two test
4356 programs to generate and test a PNG which should have the problem.
4357
4358 Version 1.6.0beta39 [January 19, 2013]
4359 Again corrected attempt at overflow detection in png_set_unknown_chunks()
4360 (CVE-2013-7353). Added overflow detection in png_set_sPLT() and
4361 png_set_text_2() (CVE-2013-7354).
4362
4363 Version 1.6.0beta40 [January 20, 2013]
4364 Use consistent handling of overflows in text, sPLT and unknown png_set_* APIs
4365
4366 Version 1.6.0rc01 [January 26, 2013]
4367 No changes.
4368
4369 Version 1.6.0rc02 [February 4, 2013]
4370 Added png_get_palette_max() function.
4371
4372 Version 1.6.0rc03 [February 5, 2013]
4373 Fixed the png_get_palette_max API.
4374
4375 Version 1.6.0rc04 [February 7, 2013]
4376 Turn serial tests back on (recently turned off by autotools upgrade).
4377
4378 Version 1.6.0rc05 [February 8, 2013]
4379 Update manual about png_get_palette_max().
4380
4381 Version 1.6.0rc06 [February 9, 2013]
4382 Fixed missing dependency in --prefix builds The intermediate
4383 internal 'prefix.h' file can only be generated correctly after
4384 pnglibconf.h, however the dependency was not in Makefile.am. The
4385 symptoms are unpredictable depending on the order make chooses to
4386 build pngprefix.h and pnglibconf.h, often the error goes unnoticed
4387 because there is a system pnglibconf.h to use instead.
4388
4389 Version 1.6.0rc07 [February 10, 2013]
4390 Enclosed the new png_get_palette_max in #ifdef PNG_GET_PALETTE_MAX_SUPPORTED
4391 block, and revised pnglibconf.h and pnglibconf.h.prebuilt accordingly.
4392
4393 Version 1.6.0rc08 [February 10, 2013]
4394 Fix typo in png.h #ifdef
4395
4396 Version 1.6.0 [February 14, 2013]
4397 No changes.
4398
4399 Version 1.6.1beta01 [February 16, 2013]
4400 Made symbol prefixing work with the ARM neon optimizations. Also allow
4401 pngpriv.h to be included for preprocessor definitions only, so it can
4402 be used in non-C/C++ files. Back ported from libpng 1.7.
4403 Made sRGB check numbers consistent.
4404 Ported libpng 1.5 options.awk/dfn file handling to 1.6, fixed one bug.
4405 Removed cc -E workround, corrected png_get_palette_max API Tested on
4406 SUN OS cc 5.9, which demonstrates the tokenization problem previously
4407 avoided by using /lib/cpp. Since all .dfn output is now protected in
4408 double quotes unless it is to be macro substituted the fix should
4409 work everywhere.
4410 Enabled parallel tests - back ported from libpng-1.7.
4411 scripts/pnglibconf.dfa formatting improvements back ported from libpng17.
4412 Fixed a race condition in the creation of the build 'scripts' directory
4413 while building with a parallel make.
4414 Use approved/supported Android method to check for NEON, use Linux/POSIX
4415 1003.1 API to check /proc/self/auxv avoiding buffer allocation and other
4416 library calls (ported from libpng15).
4417
4418 Version 1.6.1beta02 [February 19, 2013]
4419 Use parentheses more consistently in "#if defined(MACRO)" tests.
4420 Folded long lines.
4421 Reenabled code to allow zero length PLTE chunks for MNG.
4422
4423 Version 1.6.1beta03 [February 22, 2013]
4424 Fixed ALIGNED_MEMORY support.
4425 Added a new configure option:
4426 --enable-arm-neon=always will stop the run-time checks. New checks
4427 within arm/arm_init.c will cause the code not to be compiled unless
4428 __ARM_NEON__ is set. This should make it fail safe (if someone asks
4429 for it on then the build will fail if it can't be done.)
4430 Updated the INSTALL document.
4431
4432 Version 1.6.1beta04 [February 27, 2013]
4433 Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES.
4434 Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC.
4435 Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble
4436 with CRLF line endings.
4437
4438 Version 1.6.1beta05 [March 1, 2013]
4439 Avoid a possible memory leak in contrib/gregbook/readpng.c
4440
4441 Version 1.6.1beta06 [March 4, 2013]
4442 Better documentation of unknown handling API interactions.
4443 Corrected Android builds and corrected libpng.vers with symbol
4444 prefixing. It also makes those tests compile and link on Android.
4445 Added an API png_set_option() to set optimization options externally,
4446 providing an alternative and general solution for the non-portable
4447 run-time tests used by the ARM Neon code, using the PNG_ARM_NEON option.
4448 The order of settings vs options in pnglibconf.h is reversed to allow
4449 settings to depend on options and options can now set (or override) the
4450 defaults for settings.
4451
4452 Version 1.6.1beta07 [March 7, 2013]
4453 Corrected simplified API default gamma for color-mapped output, added
4454 a flag to change default. In 1.6.0 when the simplified API was used
4455 to produce color-mapped output from an input image with no gamma
4456 information the gamma assumed for the input could be different from
4457 that assumed for non-color-mapped output. In particular 16-bit depth
4458 input files were assumed to be sRGB encoded, whereas in the 'direct'
4459 case they were assumed to have linear data. This was an error. The
4460 fix makes the simplified API treat all input files the same way and
4461 adds a new flag to the png_image::flags member to allow the
4462 application/user to specify that 16-bit files contain sRGB data
4463 rather than the default linear.
4464 Fixed bugs in the pngpixel and makepng test programs.
4465
4466 Version 1.6.1beta08 [March 7, 2013]
4467 Fixed CMakelists.txt to allow building a single variant of the library
4468 (Claudio Bley):
4469 Introduced a PNG_LIB_TARGETS variable that lists all activated library
4470 targets. It is an error if this variable ends up empty, ie. you have
4471 to build at least one library variant.
4472 Made the *_COPY targets only depend on library targets actually being build.
4473 Use PNG_LIB_TARGETS to unify a code path.
4474 Changed the CREATE_SYMLINK macro to expect the full path to a file as the
4475 first argument. When symlinking the filename component of that path is
4476 determined and used as the link target.
4477 Use copy_if_different in the CREATE_SYMLINK macro.
4478
4479 Version 1.6.1beta09 [March 13, 2013]
4480 Eliminated two warnings from the Intel C compiler. The warnings are
4481 technically valid, although a reasonable treatment of division would
4482 show it to be incorrect.
4483
4484 Version 1.6.1rc01 [March 21, 2013]
4485 No changes.
4486
4487 Version 1.6.1 [March 28, 2013]
4488 No changes.
4489
4490 Version 1.6.2beta01 [April 14, 2013]
4491 Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
4492 Fixed incorrect warning of excess deflate data. End condition - the
4493 warning would be produced if the end of the deflate stream wasn't read
4494 in the last row. The warning is harmless.
4495 Corrected the test on user transform changes on read. It was in the
4496 png_set of the transform function, but that doesn't matter unless the
4497 transform function changes the rowbuf size, and that is only valid if
4498 transform_info is called.
4499 Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c
4500 (Flavio Medeiros).
4501 Corrected length written to uncompressed iTXt chunks (Samuli Suominen).
4502 Bug was introduced in libpng-1.6.0.
4503
4504 Version 1.6.2rc01 [April 18, 2013]
4505 Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length
4506 written by libpng-1.6.0 and 1.6.1.
4507 Disallow storing sRGB information when the sRGB is not supported.
4508
4509 Version 1.6.2rc02 [April 18, 2013]
4510 Merge pngtest.c with libpng-1.7.0
4511
4512 Version 1.6.2rc03 [April 22, 2013]
4513 Trivial spelling cleanup.
4514
4515 Version 1.6.2rc04 and 1.6.2rc05 [omitted]
4516
4517 Version 1.6.2rc06 [April 24, 2013]
4518 Reverted to version 1.6.2rc03. Recent changes to arm/neon support
4519 have been ported to libpng-1.7.0beta09 and will reappear in version
4520 1.6.3beta01.
4521
4522 Version 1.6.2 [April 25, 2013]
4523 No changes.
4524
4525 Version 1.6.3beta01 [April 25, 2013]
4526 Revised stack marking in arm/filter_neon.S and configure.ac.
4527 Ensure that NEON filter stuff is completely disabled when switched 'off'.
4528 Previously the ARM NEON specific files were still built if the option
4529 was switched 'off' as opposed to being explicitly disabled.
4530
4531 Version 1.6.3beta02 [April 26, 2013]
4532 Test for 'arm*' not just 'arm' in the host_cpu configure variable.
4533 Rebuilt the configure scripts.
4534
4535 Version 1.6.3beta03 [April 30, 2013]
4536 Expanded manual paragraph about writing private chunks, particularly
4537 the need to call png_set_keep_unknown_chunks() when writing them.
4538 Avoid dereferencing NULL pointer possibly returned from
4539 png_create_write_struct() (Andrew Church).
4540
4541 Version 1.6.3beta05 [May 9, 2013]
4542 Calculate our own zlib windowBits when decoding rather than trusting the
4543 CMF bytes in the PNG datastream.
4544 Added an option to force maximum window size for inflating, which was
4545 the behavior of libpng15 and earlier, via a new PNG_MAXIMUM_INFLATE_WINDOW
4546 option for png_set_options().
4547 Added png-fix-itxt and png-fix-too-far-back to the built programs and
4548 removed warnings from the source code and timepng that are revealed as
4549 a result.
4550 Detect wrong libpng versions linked to png-fix-too-far-back, which currently
4551 only works with libpng versions that can be made to reliably fail when
4552 the deflate data contains an out-of-window reference. This means only
4553 1.6 and later.
4554 Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
4555 message which it is easier to work round than ignore.
4556 Updated contrib/pngminus/pnm2png.c (Paul Stewart):
4557 Check for EOF
4558 Ignore "#" delimited comments in input file to pnm2png.c.
4559 Fixed whitespace handling
4560 Added a call to png_set_packing()
4561 Initialize dimension values so if sscanf fails at least we have known
4562 invalid values.
4563 Attempt to detect configuration issues with png-fix-too-far-back, which
4564 requires both the correct libpng and the correct zlib to function
4565 correctly.
4566 Check ZLIB_VERNUM for mismatches, enclose #error in quotes
4567 Added information in the documentation about problems with and fixes for
4568 the bad CRC and bad iTXt chunk situations.
4569
4570 Version 1.6.3beta06 [May 12, 2013]
4571 Allow contrib/pngminus/pnm2png.c to compile without WRITE_INVERT and
4572 WRITE_PACK supported (writes error message that it can't read P1 or
4573 P4 PBM files).
4574 Improved png-fix-too-far-back usage message, added --suffix option.
4575 Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
4576 right zlib header files.
4577 Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile
4578
4579 Version 1.6.3beta07 [June 8, 2013]
4580 Removed a redundant test in png_set_IHDR().
4581 Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt)
4582 Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt
4583 Enclose the prototypes for the simplified write API in
4584 #ifdef PNG_STDIO_SUPPORTED/#endif
4585 Make ARM NEON support work at compile time (not just configure time).
4586 This moves the test on __ARM_NEON__ into pngconf.h to avoid issues when
4587 using a compiler that compiles for multiple architectures at one time.
4588 Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from
4589 pnglibconf.h, allowing more of the decisions to be made internally
4590 (pngpriv.h) during the compile. Without this, symbol prefixing is broken
4591 under certain circumstances on ARM platforms. Now only the API parts of
4592 the optimizations ('check' vs 'api') are exposed in the public header files
4593 except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the
4594 decision about whether or not to use the optimizations.
4595 Protect symbol prefixing against CC/CPPFLAGS/CFLAGS useage.
4596 Previous iOS/Xcode fixes for the ARM NEON optimizations moved the test
4597 on __ARM_NEON__ from configure time to compile time. This breaks symbol
4598 prefixing because the definition of the special png_init_filter_functions
4599 call was hidden at configure time if the relevant compiler arguments are
4600 passed in CFLAGS as opposed to CC. This change attempts to avoid all
4601 the confusion that would result by declaring the init function even when
4602 it is not used, so that it will always get prefixed.
4603
4604 Version 1.6.3beta08 [June 18, 2013]
4605 Revised libpng.3 so that "doclifter" can process it.
4606
4607 Version 1.6.3beta09 [June 27, 2013]
4608 Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
4609 as parameters for png_set_gamma(). These have been available since
4610 libpng-1.5.4.
4611 Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
4612 to check all compressed chunks known to libpng.
4613
4614 Version 1.6.3beta10 [July 5, 2013]
4615 Updated documentation to show default behavior of benign errors correctly.
4616 Only compile ARM code when PNG_READ_SUPPORTED is defined.
4617 Fixed undefined behavior in contrib/tools/pngfix.c and added new strip
4618 option. pngfix relied on undefined behavior and even a simple change from
4619 gcc to g++ caused it to fail. The new strip option 'unsafe' has been
4620 implemented and is the default if --max is given. Option names have
4621 been clarified, with --strip=transform now stripping the bKGD chunk,
4622 which was stripped previously with --strip=unused.
4623 Added all documented chunk types to pngpriv.h
4624 Unified pngfix.c source with libpng17.
4625
4626 Version 1.6.3rc01 [July 11, 2013]
4627 No changes.
4628
4629 Version 1.6.3 [July 18, 2013]
4630 Revised manual about changes in iTXt chunk handling made in libpng-1.6.0.
4631 Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings
4632 may be erroneously issued by code-checking applications.
4633
4634 Version 1.6.4beta01 [August 21, 2013]
4635 Added information about png_set_options() to the manual.
4636 Delay calling png_init_filter_functions() until a row with nonzero filter
4637 is found.
4638
4639 Version 1.6.4beta02 [August 30, 2013]
4640 Fixed inconsistent conditional compilation of png_chunk_unknown_handling()
4641 prototype, definition, and usage. Made it depend on
4642 PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere.
4643
4644 Version 1.6.4rc01 [September 5, 2013]
4645 No changes.
4646
4647 Version 1.6.4 [September 12, 2013]
4648 No changes.
4649
4650 Version 1.6.5 [September 14, 2013]
4651 Removed two stray lines of code from arm/arm_init.c.
4652
4653 Version 1.6.6 [September 16, 2013]
4654 Removed two stray lines of code from arm/arm_init.c, again.
4655
4656 Version 1.6.7beta01 [September 30, 2013]
4657 Revised unknown chunk code to correct several bugs in the NO_SAVE_/NO_WRITE
4658 combination
4659 Allow HANDLE_AS_UNKNOWN to work when other options are configured off. Also
4660 fixed the pngminim makefiles to work when $(MAKEFLAGS) contains stuff
4661 which terminates the make options (as by default in recent versions of
4662 Gentoo).
4663 Avoid up-cast warnings in pngvalid.c. On ARM the alignment requirements of
4664 png_modifier are greater than that of png_store and as a consequence
4665 compilation of pngvalid.c results in a warning about increased alignment
4666 requirements because of the bare cast to (png_modifier*). The code is safe,
4667 because the pointer is known to point to a stack allocated png_modifier,
4668 but this change avoids the warning.
4669 Fixed default behavior of ARM_NEON_API. If the ARM NEON API option was
4670 compiled without the CHECK option it defaulted to on, not off.
4671 Check user callback behavior in pngunknown.c. Previous versions compiled
4672 if SAVE_UNKNOWN was not available but did nothing since the callback
4673 was never implemented.
4674 Merged pngunknown.c with 1.7 version and back ported 1.7 improvements/fixes
4675
4676 Version 1.6.7beta02 [October 12, 2013]
4677 Made changes for compatibility with automake 1.14:
4678 1) Added the 'compile' program to the list of programs that must be cleaned
4679 in autogen.sh
4680 2) Added 'subdir-objects' which causes .c files in sub-directories to be
4681 compiled such that the corresponding .o files are also in the
4682 sub-directory. This is because automake 1.14 warns that the
4683 current behavior of compiling to the top level directory may be removed
4684 in the future.
4685 3) Updated dependencies on pnglibconf.h to match the new .o locations and
4686 added all the files in contrib/libtests and contrib/tools that depend
4687 on pnglibconf.h
4688 4) Added 'BUILD_SOURCES = pnglibconf.h'; this is the automake recommended
4689 way of handling the dependencies of sources that are machine generated;
4690 unfortunately it only works if the user does 'make all' or 'make check',
4691 so the dependencies (3) are still required.
4692 Cleaned up (char*) casts of zlib messages. The latest version of the Intel C
4693 compiler complains about casting a string literal as (char*), so copied the
4694 treatment of z_const from the library code into pngfix.c
4695 Simplified error message code in pngunknown. The simplification has the
4696 useful side effect of avoiding a bogus warning generated by the latest
4697 version of the Intel C compiler (it objects to
4698 condition ? string-literal : string-literal).
4699 Make autogen.sh work with automake 1.13 as well as 1.14. Do this by always
4700 removing the 1.14 'compile' script but never checking for it.
4701
4702 Version 1.6.7beta03 [October 19, 2013]
4703 Added ARMv8 support (James Yu <james.yu at linaro.org>). Added file
4704 arm/filter_neon_intrinsics.c; enable with -mfpu=neon.
4705 Revised pngvalid to generate size images with as many filters as it can
4706 manage, limited by the number of rows.
4707 Cleaned up ARM NEON compilation handling. The tests are now in pngpriv.h
4708 and detect the broken GCC compilers.
4709
4710 Version 1.6.7beta04 [October 26, 2013]
4711 Allow clang derived from older GCC versions to use ARM intrinsics. This
4712 causes all clang builds that use -mfpu=neon to use the intrinsics code,
4713 not the assembler code. This has only been tested on iOS 7. It may be
4714 necessary to exclude some earlier clang versions but this seems unlikely.
4715 Changed NEON implementation selection mechanism. This allows assembler
4716 or intrinsics to be turned on at compile time during the build by defining
4717 PNG_ARM_NEON_IMPLEMENTATION to the correct value (2 or 1). This macro
4718 is undefined by default and the build type is selected in pngpriv.h.
4719
4720 Version 1.6.7rc01 [November 2, 2013]
4721 No changes.
4722
4723 Version 1.6.7rc02 [November 7, 2013]
4724 Fixed #include in filter_neon_intrinsics.c and ctype macros. The ctype char
4725 checking macros take an unsigned char argument, not a signed char.
4726
4727 Version 1.6.7 [November 14, 2013]
4728 No changes.
4729
4730 Version 1.6.8beta01 [November 24, 2013]
4731 Moved prototype for png_handle_unknown() in pngpriv.h outside of
4732 the #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED/#endif block.
4733 Added "-Wall" to CFLAGS in contrib/pngminim/*/makefile
4734 Conditionally compile some unused functions reported by -Wall in
4735 pngminim.
4736 Fixed 'minimal' builds. Various obviously useful minimal configurations
4737 don't build because of missing contrib/libtests test programs and
4738 overly complex dependencies in scripts/pnglibconf.dfa. This change
4739 adds contrib/conftest/*.dfa files that can be used in automatic build
4740 scripts to ensure that these configurations continue to build.
4741 Enabled WRITE_INVERT and WRITE_PACK in contrib/pngminim/encoder.
4742 Fixed pngvalid 'fail' function declaration on the Intel C Compiler.
4743 This reverts to the previous 'static' implementation and works round
4744 the 'unused static function' warning by using PNG_UNUSED().
4745
4746 Version 1.6.8beta02 [November 30, 2013]
4747 Removed or marked PNG_UNUSED some harmless "dead assignments" reported
4748 by clang scan-build.
4749 Changed tabs to 3 spaces in png_debug macros and changed '"%s"m'
4750 to '"%s" m' to improve portability among compilers.
4751 Changed png_free_default() to free() in pngtest.c
4752
4753 Version 1.6.8rc01 [December 12, 2013]
4754 Tidied up pngfix inits and fixed pngtest no-write builds.
4755
4756 Version 1.6.8rc02 [December 14, 2013]
4757 Handle zero-length PLTE chunk or NULL palette with png_error()
4758 instead of png_chunk_report(), which by default issues a warning
4759 rather than an error, leading to later reading from a NULL pointer
4760 (png_ptr->palette) in png_do_expand_palette(). This is CVE-2013-6954
4761 and VU#650142. Libpng-1.6.1 through 1.6.7 are vulnerable.
4762 Libpng-1.6.0 and earlier do not have this bug.
4763
4764 Version 1.6.8 [December 19, 2013]
4765 No changes.
4766
4767 Version 1.6.9beta01 [December 26, 2013]
4768 Bookkeeping: Moved functions around (no changes). Moved transform
4769 function definitions before the place where they are called so that
4770 they can be made static. Move the intrapixel functions and the
4771 grayscale palette builder out of the png?tran.c files. The latter
4772 isn't a transform function and is no longer used internally, and the
4773 former MNG specific functions are better placed in pngread/pngwrite.c
4774 Made transform implementation functions static. This makes the internal
4775 functions called by png_do_{read|write}_transformations static. On an
4776 x86-64 DLL build (Gentoo Linux) this reduces the size of the text
4777 segment of the DLL by 1208 bytes, about 0.6%. It also simplifies
4778 maintenance by removing the declarations from pngpriv.h and allowing
4779 easier changes to the internal interfaces.
4780 Rebuilt configure scripts with automake-1.14.1 and autoconf-2.69
4781 in the tar distributions.
4782
4783 Version 1.6.9beta02 [January 1, 2014]
4784 Added checks for libpng 1.5 to pngvalid.c. This supports the use of
4785 this version of pngvalid in libpng 1.5
4786 Merged with pngvalid.c from libpng-1.7 changes to create a single
4787 pngvalid.c
4788 Removed #error macro from contrib/tools/pngfix.c (Thomas Klausner).
4789 Merged pngrio.c, pngtrans.c, pngwio.c, and pngerror.c with libpng-1.7.0
4790 Merged libpng-1.7.0 changes to make no-interlace configurations work
4791 with test programs.
4792 Revised pngvalid.c to support libpng 1.5, which does not support the
4793 PNG_MAXIMUM_INFLATE_WINDOW option, so #define it out when appropriate in
4794 pngvalid.c
4795 Allow unversioned links created on install to be disabled in configure.
4796 In configure builds 'make install' changes/adds links like png.h
4797 and libpng.a to point to the newly installed, versioned, files (e.g.
4798 libpng17/png.h and libpng17.a). Three new configure options and some
4799 rearrangement of Makefile.am allow creation of these links to be disabled.
4800
4801 Version 1.6.9beta03 [January 10, 2014]
4802 Removed potentially misleading warning from png_check_IHDR().
4803
4804 Version 1.6.9beta04 [January 20, 2014]
4805 Updated scripts/makefile.* to use CPPFLAGS (Cosmin).
4806 Added clang attribute support (Cosmin).
4807
4808 Version 1.6.9rc01 [January 28, 2014]
4809 No changes.
4810
4811 Version 1.6.9rc02 [January 30, 2014]
4812 Quiet an uninitialized memory warning from VC2013 in png_get_png().
4813
4814 Version 1.6.9 [February 6, 2014]
4815
4816 Version 1.6.10beta01 [February 9, 2014]
4817 Backported changes from libpng-1.7.0beta30 and beta31:
4818 Fixed a large number of instances where PNGCBAPI was omitted from
4819 function definitions.
4820 Added pngimage test program for png_read_png() and png_write_png()
4821 with two new test scripts.
4822 Removed dependence on !PNG_READ_EXPAND_SUPPORTED for calling
4823 png_set_packing() in png_read_png().
4824 Fixed combination of ~alpha with shift. On read invert alpha, processing
4825 occurred after shift processing, which causes the final values to be
4826 outside the range that should be produced by the shift. Reversing the
4827 order on read makes the two transforms work together correctly and mirrors
4828 the order used on write.
4829 Do not read invalid sBIT chunks. Previously libpng only checked sBIT
4830 values on write, so a malicious PNG writer could therefore cause
4831 the read code to return an invalid sBIT chunk, which might lead to
4832 application errors or crashes. Such chunks are now skipped (with
4833 chunk_benign_error).
4834 Make png_read_png() and png_write_png() prototypes in png.h depend
4835 upon PNG_READ_SUPPORTED and PNG_WRITE_SUPPORTED.
4836 Support builds with unsupported PNG_TRANSFORM_* values. All of the
4837 PNG_TRANSFORM_* values are always defined in png.h and, because they
4838 are used for both read and write in some cases, it is not reliable
4839 to #if out ones that are totally unsupported. This change adds error
4840 detection in png_read_image() and png_write_image() to do a
4841 png_app_error() if the app requests something that cannot be done
4842 and it adds corresponding code to pngimage.c to handle such options
4843 by not attempting to test them.
4844
4845 Version 1.6.10beta02 [February 23, 2014]
4846 Moved redefines of png_error(), png_warning(), png_chunk_error(),
4847 and png_chunk_warning() from pngpriv.h to png.h to make them visible
4848 to libpng-calling applications.
4849 Moved OS dependent code from arm/arm_init.c, to allow the included
4850 implementation of the ARM NEON discovery function to be set at
4851 build-time and provide sample implementations from the current code in the
4852 contrib/arm-neon subdirectory. The __linux__ code has also been changed to
4853 compile and link on Android by using /proc/cpuinfo, and the old linux code
4854 is in contrib/arm-neon/linux-auxv.c. The new code avoids POSIX and Linux
4855 dependencies apart from opening /proc/cpuinfo and is C90 compliant.
4856 Check for info_ptr == NULL early in png_read_end() so we don't need to
4857 run all the png_handle_*() and depend on them to return if info_ptr == NULL.
4858 This improves the performance of png_read_end(png_ptr, NULL) and makes
4859 it more robust against future programming errors.
4860 Check for __has_extension before using it in pngconf.h, to
4861 support older Clang versions (Jeremy Sequoia).
4862 Treat CRC error handling with png_set_crc_action(), instead of with
4863 png_set_benign_errors(), which has been the case since libpng-1.6.0beta18.
4864 Use a user warning handler in contrib/gregbook/readpng2.c instead of default,
4865 so warnings will be put on stderr even if libpng has CONSOLE_IO disabled.
4866 Added png_ptr->process_mode = PNG_READ_IDAT_MODE in png_push_read_chunk
4867 after recognizing the IDAT chunk, which avoids an infinite loop while
4868 reading a datastream whose first IDAT chunk is of zero-length.
4869 This fixes CERT VU#684412 and CVE-2014-0333.
4870 Don't recognize known sRGB profiles as sRGB if they have been hacked,
4871 but don't reject them and don't issue a copyright violation warning.
4872
4873 Version 1.6.10beta03 [February 25, 2014]
4874 Moved some documentation from png.h to libpng.3 and libpng-manual.txt
4875 Minor editing of contrib/arm-neon/README and contrib/examples/*.c
4876
4877 Version 1.6.10rc01 [February 27, 2014]
4878 Fixed typos in the manual and in scripts/pnglibconf.dfa (CFLAGS -> CPPFLAGS
4879 and PNG_USR_CONFIG -> PNG_USER_CONFIG).
4880
4881 Version 1.6.10rc02 [February 28, 2014]
4882 Removed unreachable return statement after png_chunk_error()
4883 in pngrutil.c
4884
4885 Version 1.6.10rc03 [March 4, 2014]
4886 Un-deprecated png_data_freer().
4887
4888 Version 1.6.10 [March 6, 2014]
4889 No changes.
4890
4891 Version 1.6.11beta01 [March 17, 2014]
4892 Use "if (value != 0)" instead of "if (value)" consistently.
4893 Changed ZlibSrcDir from 1.2.5 to 1.2.8 in projects/vstudio.
4894 Moved configuration information from the manual to the INSTALL file.
4895
4896 Version 1.6.11beta02 [April 6, 2014]
4897 Removed #if/#else/#endif from inside two pow() calls in pngvalid.c because
4898 they were handled improperly by Portland Group's PGI-14.1 - PGI-14.3
4899 when using its "__builtin_pow()" function.
4900 Silence 'unused parameter' build warnings (Cosmin Truta).
4901 $(CP) is now used alongside $(RM_F). Also, use 'copy' instead of 'cp'
4902 where applicable, and applied other minor makefile changes (Cosmin).
4903 Don't warn about invalid dimensions exceeding user limits (Cosmin).
4904 Allow an easy replacement of the default pre-built configuration
4905 header with a custom header, via the make PNGLIBCONF_H_PREBUILT
4906 macro (Cosmin).
4907
4908 Version 1.6.11beta03 [April 6, 2014]
4909 Fixed a typo in pngrutil.c, introduced in libpng-1.5.6, that interferes
4910 with "blocky" expansion of sub-8-bit interlaced PNG files (Eric Huss).
4911 Optionally use __builtin_bswap16() in png_do_swap().
4912
4913 Version 1.6.11beta04 [April 19, 2014]
4914 Made progressive reading of interlaced images consistent with the
4915 behavior of the sequential reader and consistent with the manual, by
4916 moving some code out of the PNG_READ_INTERLACING_SUPPORTED blocks. The
4917 row_callback now receives the proper pass number and unexpanded rows, when
4918 png_combine_row() isn't built or used, and png_set_interlace_handling()
4919 is not called.
4920 Allow PNG_sRGB_PROFILE_CHECKING = (-1) to mean no sRGB profile checking.
4921
4922 Version 1.6.11beta05 [April 26, 2014]
4923 Do not reject ICC V2 profiles that lack padding (Kai-Uwe Behrmann).
4924 Relocated closing bracket of the sRGB profile test loop to avoid getting
4925 "Not recognizing known sRGB profile that has been edited" warning for
4926 ICC V2 profiles that lack the MD5 signature in the profile header.
4927
4928 Version 1.6.11beta06 [May 19, 2014]
4929 Added PNG_SKIP_sRGB_CHECK_PROFILE choice for png_set_option().
4930
4931 Version 1.6.11rc01 [May 27, 2014]
4932 No changes.
4933
4934 Version 1.6.11rc02 [June 3, 2014]
4935 Test ZLIB_VERNUM instead of PNG_ZLIB_VERNUM in contrib/tools/pngfix.c
4936
4937 Version 1.6.11 [June 5, 2014]
4938 No changes.
4939
4940 Version 1.6.12rc01 [June 6, 2014]
4941 Relocated new code from 1.6.11beta06 in png.c to a point after the
4942 declarations (Max Stepin).
4943
4944 Version 1.6.12rc02 [June 7, 2014]
4945 Changed file permissions of contrib/tools/intgamma.sh,
4946 test-driver, and compile from 0644 to 0755 (Cosmin).
4947
4948 Version 1.6.12rc03 [June 8, 2014]
4949 Ensure "__has_attribute()" macro exists before trying to use it with
4950 old clang compilers (MacPorts Ticket #43939).
4951
4952 Version 1.6.12 [June 12, 2014]
4953 No changes.
4954
4955 Version 1.6.13beta01 [July 4, 2014]
4956 Quieted -Wsign-compare and -Wclobber compiler warnings in
4957 contrib/pngminus/*.c
4958 Added "(void) png_ptr;" where needed in contrib/gregbook to quiet
4959 compiler complaints about unused pointers.
4960 Split a long output string in contrib/gregbook/rpng2-x.c.
4961 Added "PNG_SET_OPTION" requirement for sRGB chunk support to pnglibconf.dfa,
4962 Needed for write-only support (John Bowler).
4963 Changed "if defined(__ARM_NEON__)" to
4964 "if (defined(__ARM_NEON__) || defined(__ARM_NEON))" (James Wu).
4965 Fixed clang no-warning builds: png_digit was defined but never used.
4966
4967 Version 1.6.13beta02 [July 21, 2014]
4968 Fixed an incorrect separator ("/" should be "\") in scripts/makefile.vcwin32
4969 (bug report from Wolfgang S. Kechel). Bug was introduced in libpng-1.6.11.
4970 Also fixed makefile.bc32, makefile.bor, makefile.msc, makefile.intel, and
4971 makefile.tc3 similarly.
4972
4973 Version 1.6.13beta03 [August 3, 2014]
4974 Removed scripts/makefile.elf. It has not worked since libpng-1.5.0beta14
4975 due to elimination of the PNG_FUNCTION_EXPORT and PNG_DATA_EXPORT
4976 definitions from pngconf.h.
4977 Ensure that CMakeLists.txt makes the target "lib" directory before making
4978 symbolic link into it (SourceForge bug report #226 by Rolf Timmermans).
4979
4980 Version 1.6.13beta04 [August 8, 2014]
4981 Added opinion that the ECCN (Export Control Classification Number) for
4982 libpng is EAR99 to the README file.
4983 Eliminated use of "$<" in makefile explicit rules, when copying
4984 $PNGLIBCONF_H_PREBUILT. This does not work on some versions of make;
4985 bug introduced in libpng version 1.6.11.
4986
4987 Version 1.6.13rc01 [August 14, 2014]
4988 Made "ccopts" agree with "CFLAGS" in scripts/makefile.hp* and makefile.*sunu
4989
4990 Version 1.6.13 [August 21, 2014]
4991 No changes.
4992
4993 Version 1.6.14beta01 [September 14, 2014]
4994 Guard usage of png_ptr->options with #ifdef PNG_SET_OPTION_SUPPORTED.
4995 Do not build contrib/tools/pngfix.c when PNG_SETJMP_NOT_SUPPORTED,
4996 to allow "make" to complete without setjmp support (bug report by
4997 Claudio Fontana)
4998 Add "#include <setjmp.h>" to contrib/tools/pngfix.c (John Bowler)
4999
5000 Version 1.6.14beta02 [September 18, 2014]
5001 Use nanosleep() instead of usleep() in contrib/gregbook/rpng2-x.c
5002 because usleep() is deprecated.
5003 Define usleep() in contrib/gregbook/rpng2-x.c if not already defined
5004 in unistd.h and nanosleep() is not available; fixes error introduced
5005 in libpng-1.6.13.
5006 Disable floating point exception handling in pngvalid.c when
5007 PNG_FLOATING_ARITHMETIC is not supported (bug report by "zootus
5008 at users.sourceforge.net").
5009
5010 Version 1.6.14beta03 [September 19, 2014]
5011 Define FE_DIVBYZERO, FE_INVALID, and FE_OVERFLOW in pngvalid.c if not
5012 already defined. Revert floating point exception handling in pngvalid.c
5013 to version 1.6.14beta01 behavior.
5014
5015 Version 1.6.14beta04 [September 27, 2014]
5016 Fixed incorrect handling of the iTXt compression flag in pngrutil.c
5017 (bug report by Shunsaku Hirata). Bug was introduced in libpng-1.6.0.
5018
5019 Version 1.6.14beta05 [October 1, 2014]
5020 Added "option READ_iCCP enables READ_COMPRESSED_TEXT" to pnglibconf.dfa
5021
5022 Version 1.6.14beta06 [October 5, 2014]
5023 Removed unused "text_len" parameter from private function png_write_zTXt().
5024 Conditionally compile some code in png_deflate_claim(), when
5025 PNG_WARNINGS_SUPPORTED and PNG_ERROR_TEXT_SUPPORTED are disabled.
5026 Replaced repeated code in pngpread.c with PNG_PUSH_SAVE_BUFFER_IF_FULL.
5027 Added "chunk iTXt enables TEXT" and "chunk zTXt enables TEXT"
5028 to pnglibconf.dfa.
5029 Removed "option READ_COMPRESSED_TEXT enables READ_TEXT" from pnglibconf.dfa,
5030 to make it possible to configure a libpng that supports iCCP but not TEXT.
5031
5032 Version 1.6.14beta07 [October 7, 2014]
5033 Removed "option WRITE_COMPRESSED_TEXT enables WRITE_TEXT" from pnglibconf.dfa
5034 Only mark text chunks as written after successfully writing them.
5035
5036 Version 1.6.14rc01 [October 15, 2014]
5037 Fixed some typos in comments.
5038
5039 Version 1.6.14rc02 [October 17, 2014]
5040 Changed png_convert_to_rfc_1123() to png_convert_to_rfc_1123_buffer()
5041 in the manual, to reflect the change made in libpng-1.6.0.
5042 Updated README file to explain that direct access to the png_struct
5043 and info_struct members has not been permitted since libpng-1.5.0.
5044
5045 Version 1.6.14 [October 23, 2014]
5046 No changes.
5047
5048 Version 1.6.15beta01 [October 29, 2014]
5049 Changed "if (!x)" to "if (x == 0)" and "if (x)" to "if (x != 0)"
5050 Simplified png_free_data().
5051 Added missing "ptr = NULL" after some instances of png_free().
5052
5053 Version 1.6.15beta02 [November 1, 2014]
5054 Changed remaining "if (!x)" to "if (x == 0)" and "if (x)" to "if (x != 0)"
5055
5056 Version 1.6.15beta03 [November 3, 2014]
5057 Added PNG_USE_ARM_NEON configuration flag (Marcin Juszkiewicz).
5058
5059 Version 1.6.15beta04 [November 4, 2014]
5060 Removed new PNG_USE_ARM_NEON configuration flag and made a one-line
5061 revision to configure.ac to support ARM on aarch64 instead (John Bowler).
5062
5063 Version 1.6.15beta05 [November 5, 2014]
5064 Use png_get_libpng_ver(NULL) instead of PNG_LIBPNG_VER_STRING in
5065 example.c, pngtest.c, and applications in the contrib directory.
5066 Fixed an out-of-range read in png_user_version_check() (Bug report from
5067 Qixue Xiao, CVE-2015-8540).
5068 Simplified and future-proofed png_user_version_check().
5069 Fixed GCC unsigned int->float warnings. Various versions of GCC
5070 seem to generate warnings when an unsigned value is implicitly
5071 converted to double. This is probably a GCC bug but this change
5072 avoids the issue by explicitly converting to (int) where safe.
5073 Free all allocated memory in pngimage. The file buffer cache was left
5074 allocated at the end of the program, harmless but it causes memory
5075 leak reports from clang.
5076 Fixed array size calculations to avoid warnings. At various points
5077 in the code the number of elements in an array is calculated using
5078 sizeof. This generates a compile time constant of type (size_t) which
5079 is then typically assigned to an (unsigned int) or (int). Some versions
5080 of GCC on 64-bit systems warn about the apparent narrowing, even though
5081 the same compiler does apparently generate the correct, in-range,
5082 numeric constant. This adds appropriate, safe, casts to make the
5083 warnings go away.
5084
5085 Version 1.6.15beta06 [November 6, 2014]
5086 Reverted use png_get_libpng_ver(NULL) instead of PNG_LIBPNG_VER_STRING
5087 in the manual, example.c, pngtest.c, and applications in the contrib
5088 directory. It was incorrect advice.
5089
5090 Version 1.6.15beta07 [November 7, 2014]
5091 Removed #ifdef PNG_16BIT_SUPPORTED/#endif around png_product2(); it is
5092 needed by png_reciprocal2().
5093 Added #ifdef PNG_16BIT_SUPPORTED/#endif around png_log16bit() and
5094 png_do_swap().
5095 Changed all "#endif /* PNG_FEATURE_SUPPORTED */" to "#endif /* FEATURE */"
5096
5097 Version 1.6.15beta08 [November 8, 2014]
5098 More housecleaning in *.h
5099
5100 Version 1.6.15rc01 [November 13, 2014]
5101
5102 Version 1.6.15rc02 [November 14, 2014]
5103 The macros passed in the command line to Borland make were ignored if
5104 similarly-named macros were already defined in makefiles. This behavior
5105 is different from POSIX make and other make programs. Surround the
5106 macro definitions with ifndef guards (Cosmin).
5107
5108 Version 1.6.15rc03 [November 16, 2014]
5109 Added "-D_CRT_SECURE_NO_WARNINGS" to CFLAGS in scripts/makefile.vcwin32.
5110 Removed the obsolete $ARCH variable from scripts/makefile.darwin.
5111
5112 Version 1.6.15 [November 20, 2014]
5113 No changes.
5114
5115 Version 1.6.16beta01 [December 14, 2014]
5116 Added ".align 2" to arm/filter_neon.S to support old GAS assemblers that
5117 don't do alignment correctly.
5118 Revised Makefile.am and scripts/symbols.dfn to work with MinGW/MSYS
5119 (Bob Friesenhahn).
5120
5121 Version 1.6.16beta02 [December 15, 2014]
5122 Revised Makefile.am and scripts/*.dfn again to work with MinGW/MSYS;
5123 renamed scripts/*.dfn to scripts/*.c (John Bowler).
5124
5125 Version 1.6.16beta03 [December 21, 2014]
5126 Quiet a "comparison always true" warning in pngstest.c (John Bowler).
5127
5128 Version 1.6.16rc01 [December 21, 2014]
5129 Restored a test on width that was removed from png.c at libpng-1.6.9
5130 (Bug report by Alex Eubanks, CVE-2015-0973).
5131
5132 Version 1.6.16rc02 [December 21, 2014]
5133 Undid the update to pngrutil.c in 1.6.16rc01.
5134
5135 Version 1.6.16rc03 [December 21, 2014]
5136 Fixed an overflow in png_combine_row() with very wide interlaced images
5137 (Bug report and fix by John Bowler, CVE-2014-9495).
5138
5139 Version 1.6.16 [December 22, 2014]
5140 No changes.
5141
5142 Version 1.6.17beta01 [January 29, 2015]
5143 Removed duplicate PNG_SAFE_LIMITS_SUPPORTED handling from pngconf.h
5144 Corrected the width limit calculation in png_check_IHDR().
5145 Removed user limits from pngfix. Also pass NULL pointers to
5146 png_read_row to skip the unnecessary row de-interlace stuff.
5147 Added testing of png_set_packing() to pngvalid.c
5148 Regenerated configure scripts in the *.tar distributions with libtool-2.4.4
5149 Implement previously untested cases of libpng transforms in pngvalid.c
5150 Fixed byte order in png_do_read_filler() with 16-bit input. Previously
5151 the high and low bytes of the filler, from png_set_filler() or from
5152 png_set_add_alpha(), were read in the wrong order.
5153 Made the check for out-of-range values in png_set_tRNS() detect
5154 values that are exactly 2^bit_depth, and work on 16-bit platforms.
5155 Merged some parts of libpng-1.6.17beta01 and libpng-1.7.0beta47.
5156 Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
5157 pngset.c to avoid warnings about dead code.
5158 Added "& 0xff" to many instances of expressions that are typecast
5159 to (png_byte), to avoid Coverity warnings.
5160
5161 Version 1.6.17beta02 [February 7, 2015]
5162 Work around one more Coverity-scan dead-code warning.
5163 Do not build png_product2() when it is unused.
5164
5165 Version 1.6.17beta03 [February 17, 2015]
5166 Display user limits in the output from pngtest.
5167 Eliminated the PNG_SAFE_LIMITS macro and restored the 1-million-column
5168 and 1-million-row default limits in pnglibconf.dfa, that can be reset
5169 by the user at build time or run time. This provides a more robust
5170 defense against DOS and as-yet undiscovered overflows.
5171
5172 Version 1.6.17beta04 [February 21, 2015]
5173 Added PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED macro, on by default.
5174 Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
5175 Rebuilt configure scripts with automake-1.15 and libtool-2.4.6
5176
5177 Version 1.6.17beta05 [February 25, 2015]
5178 Restored compiling of png_reciprocal2 with PNG_NO_16BIT.
5179
5180 Version 1.6.17beta06 [February 27, 2015]
5181 Moved png_set_filter() prototype into a PNG_WRITE_SUPPORTED block
5182 of png.h.
5183 Avoid runtime checks when converting integer to png_byte with
5184 Visual Studio (Sergey Kosarevsky)
5185
5186 Version 1.6.17rc01 [March 4, 2015]
5187 No changes.
5188
5189 Version 1.6.17rc02 [March 9, 2015]
5190 Removed some comments that the configure script did not handle
5191 properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
5192 Free the unknown_chunks structure even when it contains no data.
5193
5194 Version 1.6.17rc03 [March 12, 2015]
5195 Updated CMakeLists.txt to add OSX framework, change YES/NO to ON/OFF
5196 for consistency, and remove some useless tests (Alexey Petruchik).
5197
5198 Version 1.6.17rc04 [March 16, 2015]
5199 Remove pnglibconf.h, pnglibconf.c, and pnglibconf.out instead of
5200 pnglibconf.* in "make clean" (Cosmin).
5201 Fix bug in calculation of maxbits, in png_write_sBIT, introduced
5202 in libpng-1.6.17beta01 (John Bowler).
5203
5204 Version 1.6.17rc05 [March 21, 2015]
5205 Define PNG_FILTER_* and PNG_FILTER_VALUE_* in png.h even when WRITE
5206 is not supported (John Bowler). This fixes an error introduced in
5207 libpng-1.6.17beta06.
5208 Reverted "& 0xff" additions of version 1.6.17beta01. Libpng passes
5209 the Coverity scan without them.
5210
5211 Version 1.6.17rc06 [March 23, 2015]
5212 Remove pnglibconf.dfn and pnglibconf.pre with "make clean".
5213 Reformatted some "&0xff" instances to "& 0xff".
5214 Fixed simplified 8-bit-linear to sRGB alpha. The calculated alpha
5215 value was wrong. It's not clear if this affected the final stored
5216 value; in the obvious code path the upper and lower 8-bits of the
5217 alpha value were identical and the alpha was truncated to 8-bits
5218 rather than dividing by 257 (John Bowler).
5219
5220 Version 1.6.17 [March 26, 2015]
5221 No changes.
5222
5223 Version 1.6.18beta01 [April 1, 2015]
5224 Removed PNG_SET_CHUNK_[CACHE|MALLOC]_LIMIT_SUPPORTED macros. They
5225 have been combined with PNG_SET_USER_LIMITS_SUPPORTED (resolves
5226 bug report by Andrew Church).
5227 Fixed rgb_to_gray checks and added tRNS checks to pngvalid.c. This
5228 fixes some arithmetic errors that caused some tests to fail on
5229 some 32-bit platforms (Bug reports by Peter Breitenlohner [i686]
5230 and Petr Gajdos [i586]).
5231
5232 Version 1.6.18beta02 [April 26, 2015]
5233 Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler
5234 (Bug report by Viktor Szakats).
5235
5236 Version 1.6.18beta03 [May 6, 2015]
5237 Replaced "unexpected" with an integer (0xabadca11) in pngset.c
5238 where a long was expected, to avoid a compiler warning when PNG_DEBUG > 1.
5239 Added contrib/examples/simpleover.c, to demonstrate how to handle
5240 alpha compositing of multiple images, using the "simplified API"
5241 and an example PNG generation tool, contrib/examples/genpng.c
5242 (John Bowler).
5243
5244 Version 1.6.18beta04 [May 20, 2015]
5245 PNG_RELEASE_BUILD replaces tests where the code depended on the build base
5246 type and can be defined on the command line, allowing testing in beta
5247 builds (John Bowler).
5248 Avoid Coverity issue 80858 (REVERSE NULL) in pngtest.c PNG_DEBUG builds.
5249 Avoid a harmless potential integer overflow in png_XYZ_from_xy() (Bug
5250 report from Christopher Ferris).
5251
5252 Version 1.6.18beta05 [May 31, 2015]
5253 Backport filter selection code from libpng-1.7.0beta51, to combine
5254 sub_row, up_row, avg_row, and paeth_row into try_row and tst_row.
5255 Changed png_voidcast(), etc., to voidcast(), etc., in contrib/tools/pngfix.c
5256 to avoid confusion with the libpng private macros.
5257 Fixed old cut&paste bug in the weighted filter selection code in
5258 pngwutil.c, introduced in libpng-0.95, March 1997.
5259
5260 Version 1.6.18beta06 [June 1, 2015]
5261 Removed WRITE_WEIGHTED_FILTERED code, to save a few kbytes of the
5262 compiled library size. It never worked properly and as far as we can
5263 tell, no one uses it. The png_set_filter_heuristics() and
5264 png_set_filter_heuristics_fixed() APIs are retained but deprecated
5265 and do nothing.
5266
5267 Version 1.6.18beta07 [June 6, 2015]
5268 Removed non-working progressive reader 'skip' function. This
5269 function has apparently never been used. It was implemented
5270 to support back-door modification of png_struct in libpng-1.4.x
5271 but (because it does nothing and cannot do anything) was apparently
5272 never tested (John Bowler).
5273 Fixed cexcept.h in which GCC 5 now reports that one of the auto
5274 variables in the Try macro needs to be volatile to prevent value
5275 being lost over the setjmp (John Bowler).
5276 Fixed NO_WRITE_FILTER and -Wconversion build breaks (John Bowler).
5277 Fix g++ build breaks (John Bowler).
5278 Quieted some Coverity issues in pngfix.c, png-fix-itxt.c, pngvalid.c,
5279 pngstest.c, and pngimage.c. Most seem harmless, but png-fix-itxt
5280 would only work with iTXt chunks with length 255 or less.
5281 Added #ifdef's to contrib/examples programs so people don't try
5282 to compile them without the minimum required support enabled
5283 (suggested by Flavio Medeiros).
5284
5285 Version 1.6.18beta08 [June 30, 2015]
5286 Eliminated the final two Coverity defects (insecure temporary file
5287 handling in contrib/libtests/pngstest.c; possible overflow of
5288 unsigned char in contrib/tools/png-fix-itxt.c). To use the "secure"
5289 file handling, define PNG_USE_MKSTEMP, otherwise "tmpfile()" will
5290 be used.
5291 Removed some unused WEIGHTED_FILTER macros from png.h and pngstruct.h
5292
5293 Version 1.6.18beta09 [July 5, 2015]
5294 Removed some useless typecasts from contrib/tools/png-fix-itxt.c
5295 Fixed a new signed-unsigned comparison in pngrtran.c (Max Stepin).
5296 Replaced arbitrary use of 'extern' with #define PNG_LINKAGE_*. To
5297 preserve API compatibility, the new defines all default to "extern"
5298 (requested by Jan Nijtmans).
5299
5300 Version 1.6.18rc01 [July 9, 2015]
5301 Belatedly added Mans Rullgard and James Yu to the list of Contributing
5302 Authors.
5303
5304 Version 1.6.18rc02 [July 12, 2015]
5305 Restored unused FILTER_HEURISTIC macros removed at libpng-1.6.18beta08
5306 to png.h to avoid compatibility warnings.
5307
5308 Version 1.6.18rc03 [July 15, 2015]
5309 Minor changes to the man page
5310
5311 Version 1.6.18 [July 23, 2015]
5312 No changes.
5313
5314 Version 1.6.19beta01 [July 30, 2015]
5315 Updated obsolete information about the simplified API macros in the
5316 manual pages (Bug report by Arc Riley).
5317 Avoid potentially dereferencing NULL info_ptr in png_info_init_3().
5318 Rearranged png.h to put the major sections in the same order as
5319 in libpng17.
5320 Eliminated unused PNG_COST_SHIFT, PNG_WEIGHT_SHIFT, PNG_COST_FACTOR, and
5321 PNG_WEIGHT_FACTOR macros.
5322 Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler
5323 (Bug report by Viktor Szakats). Several warnings remain and are
5324 unavoidable, where we test for overflow.
5325 Fixed potential leak of png_pixels in contrib/pngminus/pnm2png.c
5326 Fixed uninitialized variable in contrib/gregbook/rpng2-x.c
5327
5328 Version 1.6.19beta02 [August 19, 2015]
5329 Moved config.h.in~ from the "libpng_autotools_files" list to the
5330 "libpng_autotools_extra" list in autogen.sh because it was causing a
5331 false positive for missing files (bug report by Robert C. Seacord).
5332 Removed unreachable "break" statements in png.c, pngread.c, and pngrtran.c
5333 to suppress clang warnings (Bug report by Viktor Szakats).
5334 Fixed some bad links in the man page.
5335 Changed "n bit" to "n-bit" in comments.
5336 Added signed/unsigned 16-bit safety net. This removes the dubious
5337 0x8000 flag definitions on 16-bit systems. They aren't supported
5338 yet the defs *probably* work, however it seems much safer to do this
5339 and be advised if anyone, contrary to advice, is building libpng 1.6
5340 on a 16-bit system. It also adds back various switch default clauses
5341 for GCC; GCC errors out if they are not present (with an appropriately
5342 high level of warnings).
5343 Safely convert num_bytes to a png_byte in png_set_sig_bytes() (Robert
5344 Seacord).
5345 Fixed the recently reported 1's complement security issue by replacing
5346 the value that is illegal in the PNG spec, in both signed and unsigned
5347 values, with 0. Illegal unsigned values (anything greater than or equal
5348 to 0x80000000) can still pass through, but since these are not illegal
5349 in ANSI-C (unlike 0x80000000 in the signed case) the checking that
5350 occurs later can catch them (John Bowler).
5351
5352 Version 1.6.19beta03 [September 26, 2015]
5353 Fixed png_save_int_32 when int is not 2's complement (John Bowler).
5354 Updated libpng16 with all the recent test changes from libpng17,
5355 including changes to pngvalid.c to ensure that the original,
5356 distributed, version of contrib/visupng/cexcept.h can be used
5357 (John Bowler).
5358 pngvalid contains the correction to the use of SAVE/STORE_
5359 UNKNOWN_CHUNKS; a bug revealed by changes in libpng 1.7. More
5360 tests contain the --strict option to detect warnings and the
5361 pngvalid-standard test has been corrected so that it does not
5362 turn on progressive-read. There is a separate test which does
5363 that. (John Bowler)
5364 Also made some signed/unsigned fixes.
5365 Make pngstest error limits version specific. Splitting the machine
5366 generated error structs out to a file allows the values to be updated
5367 without changing pngstest.c itself. Since libpng 1.6 and 1.7 have
5368 slightly different error limits this simplifies maintenance. The
5369 makepngs.sh script has also been updated to more accurately reflect
5370 current problems in libpng 1.7 (John Bowler).
5371 Incorporated new test PNG files into make check. tests/pngstest-*
5372 are changed so that the new test files are divided into 8 groups by
5373 gamma and alpha channel. These tests have considerably better code
5374 and pixel-value coverage than contrib/pngsuite; however,coverage is
5375 still incomplete (John Bowler).
5376 Removed the '--strict' in 1.6 because of the double-gamma-correction
5377 warning, updated pngstest-errors.h for the errors detected with the
5378 new contrib/testspngs PNG test files (John Bowler).
5379
5380 Version 1.6.19beta04 [October 15, 2015]
5381 Worked around rgb-to-gray issues in libpng 1.6. The previous
5382 attempts to ignore the errors in the code aren't quite enough to
5383 deal with the 'channel selection' encoding added to libpng 1.7; abort.
5384 pngvalid.c is changed to drop this encoding in prior versions.
5385 Fixed 'pow' macros in pngvalid.c. It is legal for 'pow' to be a
5386 macro, therefore the argument list cannot contain preprocessing
5387 directives. Make sure pow is a function where this happens. This is
5388 a minimal safe fix, the issue only arises in non-performance-critical
5389 code (bug report by Curtis Leach, fix by John Bowler).
5390 Added sPLT support to pngtest.c
5391
5392 Version 1.6.19rc01 [October 23, 2015]
5393 No changes.
5394
5395 Version 1.6.19rc02 [October 31, 2015]
5396 Prevent setting or writing over-length PLTE chunk (Cosmin Truta).
5397 Silently truncate over-length PLTE chunk while reading.
5398 Libpng incorrectly calculated the output rowbytes when the application
5399 decreased either the number of channels or the bit depth (or both) in
5400 a user transform. This was safe; libpng overallocated buffer space
5401 (potentially by quite a lot; up to 4 times the amount required) but,
5402 from 1.5.4 on, resulted in a png_error (John Bowler).
5403
5404 Version 1.6.19rc03 [November 3, 2015]
5405 Fixed some inconsequential cut-and-paste typos in png_set_cHRM_XYZ_fixed().
5406 Clarified COPYRIGHT information to state explicitly that versions
5407 are derived from previous versions.
5408 Removed much of the long list of previous versions from png.h and
5409 libpng.3.
5410
5411 Version 1.6.19rc04 [November 5, 2015]
5412 Fixed new bug with CRC error after reading an over-length palette
5413 (bug report by Cosmin Truta) (CVE-2015-8126).
5414
5415 Version 1.6.19 [November 12, 2015]
5416 Cleaned up coding style in png_handle_PLTE().
5417
5418 Version 1.6.20beta01 [November 20, 2015]
5419 Avoid potential pointer overflow/underflow in png_handle_sPLT() and
5420 png_handle_pCAL() (Bug report by John Regehr).
5421
5422 Version 1.6.20beta02 [November 23, 2015]
5423 Fixed incorrect implementation of png_set_PLTE() that uses png_ptr
5424 not info_ptr, that left png_set_PLTE() open to the CVE-2015-8126
5425 vulnerability. Fixes CVE-2015-8472.
5426
5427 Version 1.6.20beta03 [November 24, 2015]
5428 Backported tests from libpng-1.7.0beta69.
5429
5430 Version 1.6.20rc01 [November 26, 2015]
5431 Fixed an error in handling of bad zlib CMINFO field in pngfix, found by
5432 American Fuzzy Lop, reported by Brian Carpenter. inflate() doesn't
5433 immediately fault a bad CMINFO field; instead a 'too far back' error
5434 happens later (at least some times). pngfix failed to limit CMINFO to
5435 the allowed values but then assumed that window_bits was in range,
5436 triggering an assert. The bug is mostly harmless; the PNG file cannot
5437 be fixed.
5438
5439 Version 1.6.20rc02 [November 29, 2015]
5440 In libpng 1.6 zlib initialization was changed to use the window size
5441 in the zlib stream, not a fixed value. This causes some invalid images,
5442 where CINFO is too large, to display 'correctly' if the rest of the
5443 data is valid. This provides a workaround for zlib versions where the
5444 error arises (ones that support the API change to use the window size
5445 in the stream).
5446
5447 Version 1.6.20 [December 3, 2015]
5448 No changes.
5449
5450 Version 1.6.21beta01 [December 11, 2015]
5451 Fixed syntax "$(command)" in tests/pngstest that some shells other than
5452 bash could not parse (Bug report by Nelson Beebe). Use `command` instead.
5453
5454 Version 1.6.21beta02 [December 14, 2015]
5455 Moved png_check_keyword() from pngwutil.c to pngset.c
5456 Removed LE/BE dependencies in pngvalid, to 'fix' the current problem
5457 in the BigEndian tests by not testing it, making the BE code the same
5458 as the LE version.
5459 Fixes to pngvalid for various reduced build configurations (eliminate unused
5460 statics) and a fix for the case in rgb_to_gray when the digitize option
5461 reduces graylo to 0, producing a large error.
5462
5463 Version 1.6.21beta03 [December 18, 2015]
5464 Widened the 'limit' check on the internally calculated error limits in
5465 the 'DIGITIZE' case (the code used prior to 1.7 for rgb_to_gray error
5466 checks) and changed the check to only operate in non-release builds
5467 (base build type not RC or RELEASE.)
5468 Fixed undefined behavior in pngvalid.c, undefined because
5469 (png_byte) << shift is undefined if it changes the signed bit
5470 (because png_byte is promoted to int). The libpng exported functions
5471 png_get_uint_32 and png_get_uint_16 handle this. (Bug reported by
5472 David Drysdale as a result of reports from UBSAN in clang 3.8).
5473 This changes pngvalid to use BE random numbers; this used to produce
5474 errors but these should not be fixed as a result of the previous changes.
5475
5476 Version 1.6.21rc01 [January 4, 2016]
5477 In projects/vstudio, combined readme.txt and WARNING into README.txt
5478
5479 Version 1.6.21rc02 [January 7, 2016]
5480 Relocated assert() in contrib/tools/pngfix.c, bug found by American
5481 Fuzzy Lop, reported by Brian Carpenter.
5482 Marked 'limit' UNUSED in transform_range_check(). This only affects
5483 release builds.
5484
5485 Version 1.6.21 [January 15, 2016]
5486 Worked around a false-positive Coverity issue in pngvalid.c.
5487
5488 Version 1.6.22beta01 [January 23, 2016]
5489 Changed PNG_USE_MKSTEMP to __COVERITY__ to select alternate
5490 "tmpfile()" implementation in contrib/libtests/pngstest.c
5491 Fixed NO_STDIO build of pngunknown.c to skip calling png_init_io()
5492 if there is no stdio.h support.
5493 Added a png_image_write_to_memory() API and a number of assist macros
5494 to allow an application that uses the simplified API write to bypass
5495 stdio and write directly to memory.
5496 Added some warnings (png.h) and some check code to detect *possible*
5497 overflow in the ROW_STRIDE and simplified image SIZE macros. This
5498 disallows image width/height/format that *might* overflow. This is
5499 a quiet API change that limits in-memory image size (uncompressed) to
5500 less than 4GByte and image row size (stride) to less than 2GByte.
5501 Revised workaround for false-positive Coverity issue in pngvalid.c.
5502
5503 Version 1.6.22beta02 [February 8, 2016]
5504 Only use exit(77) in configure builds.
5505 Corrected error in PNG_IMAGE_PNG_SIZE_MAX. This new macro underreported
5506 the palette size because it failed to take into account that the memory
5507 palette has to be expanded to full RGB when it is written to PNG.
5508 Updated CMakeLists.txt, added supporting scripts/gen*.cmake.in
5509 and test.cmake.in (Roger Leigh).
5510 Relaxed limit checks on gamma values in pngrtran.c. As suggested in
5511 the comments gamma values outside the range currently permitted
5512 by png_set_alpha_mode are useful for HDR data encoding. These values
5513 are already permitted by png_set_gamma so it is reasonable caution to
5514 extend the png_set_alpha_mode range as HDR imaging systems are starting
5515 to emerge.
5516
5517 Version 1.6.22beta03 [March 9, 2016]
5518 Added a common-law trademark notice and export control information
5519 to the LICENSE file, png.h, and the man page.
5520 Restored "& 0xff" in png_save_uint_16() and png_save_uint_32() that
5521 were accidentally removed from libpng-1.6.17.
5522 Changed PNG_INFO_cHNK and PNG_FREE_cHNK from 0xnnnn to 0xnnnnU in png.h
5523 (Robert C. Seacord).
5524 Removed dubious "#if INT_MAX" test from png.h that was added to
5525 libpng-1.6.19beta02 (John Bowler).
5526 Add ${INCLUDES} in scripts/genout.cmake.in (Bug report by Nixon Kwok).
5527 Updated LICENSE to say files in the contrib directory are not
5528 necessarily under the libpng license, and that some makefiles have
5529 other copyright owners.
5530 Added INTEL-SSE2 support (Mike Klein and Matt Sarett, Google, Inc.).
5531 Made contrib/libtests/timepng more robust. The code no longer gives
5532 up/fails on invalid PNG data, it just skips it (with error messages).
5533 The code no longer fails on PNG files with data beyond IEND. Options
5534 exist to use png_read_png (reading the whole image, not by row) and, in
5535 that case, to apply any of the supported transforms. This makes for
5536 more realistic testing; the decoded data actually gets used in a
5537 meaningful fashion (John Bowler).
5538 Fixed some misleading indentation (Krishnaraj Bhat).
5539
5540 Version 1.6.22beta04 [April 5, 2016]
5541 Force GCC compilation to C89 if needed (Dagobert Michelsen).
5542 SSE filter speed improvements for bpp=3:
5543 memcpy-free implementations of load3() / store3().
5544 call load3() only when needed at the end of a scanline.
5545
5546 Version 1.6.22beta05 [April 27, 2016]
5547 Added PNG_FAST_FILTERS macro (defined as
5548 PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_UP).
5549 Various fixes for contrib/libtests/timepng.c
5550 Moved INTEL-SSE code from pngpriv.h into contrib/intel/intel_sse.patch.
5551 Fixed typo (missing underscore) in #define PNG_READ_16_TO_8_SUPPORTED
5552 (Bug report by Y.Ohashik).
5553
5554 Version 1.6.22beta06 [May 5, 2016]
5555 Rebased contrib/intel_sse.patch.
5556 Quieted two Coverity issues in contrib/libtests/timepng.c.
5557 Fixed issues with scripts/genout.cmake.in (David Capello, Nixon Kwok):
5558 Added support to use multiple directories in ZLIBINCDIR variable,
5559 Fixed CMAKE_C_FLAGS with multiple values when genout is compiled on MSVC,
5560 Fixed pnglibconf.c compilation on OS X including the sysroot path.
5561
5562 Version 1.6.22rc01 [May 14, 2016]
5563 No changes.
5564
5565 Version 1.6.22rc02 [May 16, 2016]
5566 Removed contrib/timepng from default build; it does not build on platforms
5567 that don't supply clock_gettime().
5568
5569 Version 1.6.22rc03 [May 17, 2016]
5570 Restored contrib/timepng to default build but check for the presence
5571 of clock_gettime() in configure.ac and Makefile.am.
5572
5573 Version 1.6.22 [May 26, 2016]
5574 No changes.
5575
5576 Version 1.6.23beta01 [May 29, 2016]
5577 Stop a potential memory leak in png_set_tRNS() (Bug report by Ted Ying).
5578 Fixed the progressive reader to handle empty first IDAT chunk properly
5579 (patch by Timothy Nikkel). This bug was introduced in libpng-1.6.0 and
5580 only affected the libpng16 branch.
5581 Added tests in pngvalid.c to check zero-length IDAT chunks in various
5582 positions. Fixed the sequential reader to handle these more robustly
5583 (John Bowler).
5584
5585 Version 1.6.23rc01 [June 2, 2016]
5586 Corrected progressive read input buffer in pngvalid.c. The previous version
5587 the code invariably passed just one byte at a time to libpng. The intent
5588 was to pass a random number of bytes in the range 0..511.
5589 Moved sse2 prototype from pngpriv.h to contrib/intel/intel_sse.patch.
5590 Added missing ")" in pngerror.c (Matt Sarrett).
5591
5592 Version 1.6.23rc02 [June 4, 2016]
5593 Fixed undefined behavior in png_push_save_buffer(). Do not call
5594 memcpy() with a null source, even if count is zero (Leon Scroggins III).
5595
5596 Version 1.6.23 [June 9, 2016]
5597 Fixed bad link to RFC2083 in png.5 (Nikola Forro).
5598
5599 Version 1.6.24beta01 [June 11, 2016]
5600 Avoid potential overflow of the PNG_IMAGE_SIZE macro. This macro
5601 is not used within libpng, but is used in some of the examples.
5602
5603 Version 1.6.24beta02 [June 23, 2016]
5604 Correct filter heuristic overflow handling. This was broken when the
5605 write filter code was moved out-of-line; if there is a single filter and
5606 the heuristic sum overflows the calculation of the filtered line is not
5607 completed. In versions prior to 1.6 the code was duplicated in-line
5608 and the check not performed, so the filter operation completed; however,
5609 in the multi-filter case where the sum is performed the 'none' filter would
5610 be selected if all the sums overflowed, even if it wasn't in the filter
5611 list. The fix to the first problem is simply to provide PNG_SIZE_MAX as
5612 the current lmins sum value; this means the sum can never exceed it and
5613 overflows silently. A reasonable compiler that does choose to inline
5614 the code will simply eliminate the sum check.
5615 The fix to the second problem is to use high precision arithmetic (this is
5616 implemented in 1.7), however a simple safe fix here is to chose the lowest
5617 numbered filter in the list from png_set_filter (this only works if the
5618 first problem is also fixed) (John Bowler).
5619 Use a more efficient absolute value calculation on SSE2 (Matthieu Darbois).
5620 Fixed the case where PNG_IMAGE_BUFFER_SIZE can overflow in the application
5621 as a result of the application using an increased 'row_stride'; previously
5622 png_image_finish_read only checked for overflow on the base calculation of
5623 components. (I.e. it checked for overflow of a 32-bit number on the total
5624 number of pixel components in the output format, not the possibly padded row
5625 length and not the number of bytes, which for linear formats is twice the
5626 number of components.)
5627 MSVC does not like '-(unsigned)', so replaced it with 0U-(unsigned)
5628 MSVC does not like (uInt) = -(unsigned) (i.e. as an initializer), unless
5629 the conversion is explicitly invoked by a cast.
5630 Put the SKIP definition in the correct place. It needs to come after the
5631 png.h include (see all the other .c files in contrib/libtests) because it
5632 depends on PNG_LIBPNG_VER.
5633 Removed the three compile warning options from the individual project
5634 files into the zlib.props globals. It increases the warning level from 4
5635 to All and adds a list of the warnings that need to be turned off. This is
5636 semi-documentary; the intent is to tell libpng users which warnings have
5637 been examined and judged non-fixable at present. The warning about
5638 structure padding is fixable, but it would be a signficant change (moving
5639 structure members around).
5640
5641 Version 1.6.24beta03 [July 4, 2016]
5642 Optimized absolute value calculation in filter selection, similar to
5643 code in the PAETH decoder in pngrutil.c. Build with PNG_USE_ABS to
5644 use this.
5645 Added pngcp to the build together with a pngcp.dfa configuration test.
5646 Added high resolution timing to pngcp.
5647 Added "Common linking failures" section to INSTALL.
5648 Relocated misplaced #endif in png.c sRGB profile checking.
5649 Fixed two Coverity issues in pngcp.c.
5650
5651 Version 1.6.24beta04 [July 8, 2016]
5652 Avoid filter-selection heuristic sum calculations in cases where only one
5653 filter is a candidate for selection. This trades off code size (added
5654 private png_setup_*_row_only() functions) for speed.
5655
5656 Version 1.6.24beta05 [July 13, 2016]
5657 Fixed some indentation to comply with our coding style.
5658 Added contrib/tools/reindent.
5659
5660 Version 1.6.24beta06 [July 18, 2016]
5661 Fixed more indentation to comply with our coding style.
5662 Eliminated unnecessary tests of boolean png_isaligned() vs 0.
5663
5664 Version 1.6.24rc01 [July 25, 2016]
5665 No changes.
5666
5667 Version 1.6.24rc02 [August 1, 2016]
5668 Conditionally compile SSE2 headers in contrib/intel/intel_sse.patch
5669 Conditionally compile png_decompress_chunk().
5670
5671 Version 1.6.24rc03 [August 2, 2016]
5672 Conditionally compile ARM_NEON headers in pngpriv.h
5673 Updated contrib/intel/intel_sse.patch
5674
5675 Version 1.6.24[August 4, 2016]
5676 No changes.
5677
5678 Version 1.6.25beta01 [August 12, 2016]
5679 Reject oversized iCCP profile immediately.
5680 Cleaned up PNG_DEBUG compile of pngtest.c.
5681 Conditionally compile png_inflate().
5682
5683 Version 1.6.25beta02 [August 18, 2016]
5684 Don't install pngcp; it conflicts with pngcp in the pngtools package.
5685 Minor editing of INSTALL, (whitespace, added copyright line)
5686
5687 Version 1.6.25rc01 [August 24, 2016]
5688 No changes.
5689
5690 Version 1.6.25rc02 [August 29, 2016]
5691 Added MIPS support (Mandar Sahastrabuddhe <Mandar.Sahastrabuddhe@imgtec.com>).
5692 Only the UP filter is currently implemented.
5693
5694 Version 1.6.25rc03 [August 29, 2016]
5695 Rebased contrib/intel/intel_sse.patch after the MIPS implementation.
5696
5697 Version 1.6.25rc04 [August 30, 2016]
5698 Added MIPS support for SUB, AVG, and PAETH filters (Mandar Sahastrabuddhe).
5699
5700 Version 1.6.25rc05 [August 30, 2016]
5701 Rebased contrib/intel/intel_sse.patch after the MIPS implementation update..
5702
5703 Version 1.6.25 [September 1, 2016]
5704 No changes.
5705
5706 Version 1.6.26beta01 [September 26, 2016]
5707 Fixed handling zero length IDAT in pngfix (bug report by Agostino Sarubbo,
5708 bugfix by John Bowler).
5709 Do not issue a png_error() on read in png_set_pCAL() because png_handle_pCAL
5710 has allocated memory that libpng needs to free.
5711 Conditionally compile png_set_benign_errors() in pngread.c and pngtest.c
5712 Issue a png_benign_error instead of a png_error on ADLER32 mismatch
5713 while decoding compressed data chunks.
5714 Changed PNG_ZLIB_VERNUM to ZLIB_VERNUM in pngpriv.h, pngstruct.h, and
5715 pngrutil.c.
5716 If CRC handling of critical chunks has been set to PNG_CRC_QUIET_USE,
5717 ignore the ADLER32 checksum in the IDAT chunk as well as the chunk CRCs.
5718 Issue png_benign_error() on ADLER32 checksum mismatch instead of png_error().
5719 Add tests/badcrc.png and tests/badadler.png to tests/pngtest.
5720 Merged pngtest.c with libpng-1.7.0beta84/pngtest.c
5721
5722 Version 1.6.26beta02 [October 1, 2016]
5723 Updated the documentation about CRC and ADLER32 handling.
5724 Quieted 117 warnings from clang-3.8 in pngtrans.c, pngread.c,
5725 pngwrite.c, pngunknown.c, and pngvalid.c.
5726 Quieted 58 (out of 144) -Wconversion compiler warnings by changing
5727 flag definitions in pngpriv.h from 0xnnnn to 0xnnnnU and trivial changes
5728 in png.c, pngread.c, and pngwutil.c.
5729
5730 Version 1.6.26beta03 [October 2, 2016]
5731 Removed contrib/libtests/*.orig and *.rej that slipped into the tarballs.
5732 Quieted the 86 remaining -Wconversion compiler warnings by
5733 revising the png_isaligned() macro and trivial changes in png.c,
5734 pngerror.c, pngget.c, pngmem.c, pngset.c, pngrtran.c, pngrutil.c,
5735 pngwtran.c, pngwrite.c, and pngwutil.c.
5736
5737 Version 1.6.26beta04 [October 3, 2016]
5738 Quieted (bogus?) clang warnings about "absolute value has no effect"
5739 when PNG_USE_ABS is defined.
5740 Fixed offsets in contrib/intel/intel_sse.patch
5741
5742 Version 1.6.26beta05 [October 6, 2016]
5743 Changed integer constant 4294967294 to unsigned 4294967294U in pngconf.h
5744 to avoid a signed/unsigned compare in the preprocessor.
5745
5746 Version 1.6.26beta06 [October 7, 2016]
5747 Use zlib-1.2.8.1 inflateValidate() instead of inflateReset2() to
5748 optionally avoid ADLER32 evaluation.
5749
5750 Version 1.6.26rc01 [October 12, 2016]
5751 No changes.
5752
5753 Version 1.6.26 [October 20, 2016]
5754 Cosmetic change, "ptr != 0" to "ptr != NULL" in png.c and pngrutil.c
5755 Despammed email addresses (replaced "@" with " at ").
5756
5757 Version 1.6.27beta01 [November 2, 2016]
5758 Restrict the new ADLER32-skipping to IDAT chunks. It broke iCCP chunk
5759 handling: an erroneous iCCP chunk would throw a png_error and reject the
5760 entire PNG image instead of rejecting just the iCCP chunk with a warning,
5761 if built with zlib-1.2.8.1.
5762
5763 Version 1.6.27rc01 [December 27, 2016]
5764 Control ADLER32 checking with new PNG_IGNORE_ADLER32 option.
5765 Removed the use of a macro containing the pre-processor 'defined'
5766 operator. It is unclear whether this is valid; a macro that
5767 "generates" 'defined' is not permitted, but the use of the word
5768 "generates" within the C90 standard seems to imply more than simple
5769 substitution of an expression itself containing a well-formed defined
5770 operation.
5771 Added ARM support to CMakeLists.txt (Andreas Franek).
5772
5773 Version 1.6.27 [December 29, 2016]
5774 Fixed a potential null pointer dereference in png_set_text_2() (bug report
5775 and patch by Patrick Keshishian, CVE-2016-10087).
5776
5777 Version 1.6.28rc01 [January 3, 2017]
5778 Fixed arm/aarch64 detection in CMakeLists.txt (Gianfranco Costamagna).
5779 Added option to Cmake build allowing a custom location of zlib to be
5780 specified in a scenario where libpng is being built as a subproject
5781 alongside zlib by another project (Sam Serrels).
5782 Changed png_ptr->options from a png_byte to png_uint_32, to accomodate
5783 up to 16 options.
5784
5785 Version 1.6.28rc02 [January 4, 2017]
5786 Added "include(GNUInstallDirs)" to CMakeLists.txt (Gianfranco Costamagna).
5787 Moved SSE2 optimization code into the main libpng source directory.
5788 Configure libpng with "configure --enable-intel-sse" or compile
5789 libpng with "-DPNG_INTEL_SSE" in CPPFLAGS to enable it.
5790
5791 Version 1.6.28rc03 [January 4, 2017]
5792 Backed out the SSE optimization and last CMakeLists.txt to allow time for QA.
5793
5794 Version 1.6.28 [January 5, 2017]
5795 No changes.
5796
5797 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
5798 (subscription required; visit
5799 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
5800 to subscribe)
5801 or to glennrp at users.sourceforge.net
5802
5803 Glenn R-P
5804 #endif