1 /****************************************************************************
2 *
3 * ftstream.h
4 *
5 * Stream handling (specification).
6 *
7 * Copyright (C) 1996-2019 by
8 * David Turner, Robert Wilhelm, and Werner Lemberg.
9 *
10 * This file is part of the FreeType project, and may only be used,
11 * modified, and distributed under the terms of the FreeType project
12 * license, LICENSE.TXT. By continuing to use, modify, or distribute
13 * this file you indicate that you have read the license and
14 * understand and accept it fully.
15 *
16 */
17
18
19 #ifndef FTSTREAM_H_
20 #define FTSTREAM_H_
21
22
23 #include <ft2build.h>
24 #include FT_SYSTEM_H
25 #include FT_INTERNAL_OBJECTS_H
26
27
28 FT_BEGIN_HEADER
29
30
31 /* format of an 8-bit frame_op value: */
32 /* */
33 /* bit 76543210 */
34 /* xxxxxxes */
35 /* */
36 /* s is set to 1 if the value is signed. */
37 /* e is set to 1 if the value is little-endian. */
38 /* xxx is a command. */
39
40 #define FT_FRAME_OP_SHIFT 2
41 #define FT_FRAME_OP_SIGNED 1
42 #define FT_FRAME_OP_LITTLE 2
43 #define FT_FRAME_OP_COMMAND( x ) ( x >> FT_FRAME_OP_SHIFT )
44
45 #define FT_MAKE_FRAME_OP( command, little, sign ) \
46 ( ( command << FT_FRAME_OP_SHIFT ) | ( little << 1 ) | sign )
47
48 #define FT_FRAME_OP_END 0
49 #define FT_FRAME_OP_START 1 /* start a new frame */
50 #define FT_FRAME_OP_BYTE 2 /* read 1-byte value */
51 #define FT_FRAME_OP_SHORT 3 /* read 2-byte value */
52 #define FT_FRAME_OP_LONG 4 /* read 4-byte value */
53 #define FT_FRAME_OP_OFF3 5 /* read 3-byte value */
54 #define FT_FRAME_OP_BYTES 6 /* read a bytes sequence */
55
56
57 typedef enum FT_Frame_Op_
58 {
59 ft_frame_end = 0,
60 ft_frame_start = FT_MAKE_FRAME_OP( FT_FRAME_OP_START, 0, 0 ),
61
62 ft_frame_byte = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTE, 0, 0 ),
63 ft_frame_schar = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTE, 0, 1 ),
64
65 ft_frame_ushort_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 0, 0 ),
66 ft_frame_short_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 0, 1 ),
67 ft_frame_ushort_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 1, 0 ),
68 ft_frame_short_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 1, 1 ),
69
70 ft_frame_ulong_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 0 ),
71 ft_frame_long_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 1 ),
72 ft_frame_ulong_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 1, 0 ),
73 ft_frame_long_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 1, 1 ),
74
75 ft_frame_uoff3_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 0 ),
76 ft_frame_off3_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 1 ),
77 ft_frame_uoff3_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 1, 0 ),
78 ft_frame_off3_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 1, 1 ),
79
80 ft_frame_bytes = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTES, 0, 0 ),
81 ft_frame_skip = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTES, 0, 1 )
82
83 } FT_Frame_Op;
84
85
86 typedef struct FT_Frame_Field_
87 {
88 FT_Byte value;
89 FT_Byte size;
90 FT_UShort offset;
91
92 } FT_Frame_Field;
93
94
95 /* Construct an FT_Frame_Field out of a structure type and a field name. */
96 /* The structure type must be set in the FT_STRUCTURE macro before */
97 /* calling the FT_FRAME_START() macro. */
98 /* */
99 #define FT_FIELD_SIZE( f ) \
100 (FT_Byte)sizeof ( ((FT_STRUCTURE*)0)->f )
101
102 #define FT_FIELD_SIZE_DELTA( f ) \
103 (FT_Byte)sizeof ( ((FT_STRUCTURE*)0)->f[0] )
104
105 #define FT_FIELD_OFFSET( f ) \
106 (FT_UShort)( offsetof( FT_STRUCTURE, f ) )
107
108 #define FT_FRAME_FIELD( frame_op, field ) \
109 { \
110 frame_op, \
111 FT_FIELD_SIZE( field ), \
112 FT_FIELD_OFFSET( field ) \
113 }
114
115 #define FT_MAKE_EMPTY_FIELD( frame_op ) { frame_op, 0, 0 }
116
117 #define FT_FRAME_START( size ) { ft_frame_start, 0, size }
118 #define FT_FRAME_END { ft_frame_end, 0, 0 }
119
120 #define FT_FRAME_LONG( f ) FT_FRAME_FIELD( ft_frame_long_be, f )
121 #define FT_FRAME_ULONG( f ) FT_FRAME_FIELD( ft_frame_ulong_be, f )
122 #define FT_FRAME_SHORT( f ) FT_FRAME_FIELD( ft_frame_short_be, f )
123 #define FT_FRAME_USHORT( f ) FT_FRAME_FIELD( ft_frame_ushort_be, f )
124 #define FT_FRAME_OFF3( f ) FT_FRAME_FIELD( ft_frame_off3_be, f )
125 #define FT_FRAME_UOFF3( f ) FT_FRAME_FIELD( ft_frame_uoff3_be, f )
126 #define FT_FRAME_BYTE( f ) FT_FRAME_FIELD( ft_frame_byte, f )
127 #define FT_FRAME_CHAR( f ) FT_FRAME_FIELD( ft_frame_schar, f )
128
129 #define FT_FRAME_LONG_LE( f ) FT_FRAME_FIELD( ft_frame_long_le, f )
130 #define FT_FRAME_ULONG_LE( f ) FT_FRAME_FIELD( ft_frame_ulong_le, f )
131 #define FT_FRAME_SHORT_LE( f ) FT_FRAME_FIELD( ft_frame_short_le, f )
132 #define FT_FRAME_USHORT_LE( f ) FT_FRAME_FIELD( ft_frame_ushort_le, f )
133 #define FT_FRAME_OFF3_LE( f ) FT_FRAME_FIELD( ft_frame_off3_le, f )
134 #define FT_FRAME_UOFF3_LE( f ) FT_FRAME_FIELD( ft_frame_uoff3_le, f )
135
136 #define FT_FRAME_SKIP_LONG { ft_frame_long_be, 0, 0 }
137 #define FT_FRAME_SKIP_SHORT { ft_frame_short_be, 0, 0 }
138 #define FT_FRAME_SKIP_BYTE { ft_frame_byte, 0, 0 }
139
140 #define FT_FRAME_BYTES( field, count ) \
141 { \
142 ft_frame_bytes, \
143 count, \
144 FT_FIELD_OFFSET( field ) \
145 }
146
147 #define FT_FRAME_SKIP_BYTES( count ) { ft_frame_skip, count, 0 }
148
149
150 /**************************************************************************
151 *
152 * Integer extraction macros -- the 'buffer' parameter must ALWAYS be of
153 * type 'char*' or equivalent (1-byte elements).
154 */
155
156 #define FT_BYTE_( p, i ) ( ((const FT_Byte*)(p))[(i)] )
157
158 #define FT_INT16( x ) ( (FT_Int16)(x) )
159 #define FT_UINT16( x ) ( (FT_UInt16)(x) )
160 #define FT_INT32( x ) ( (FT_Int32)(x) )
161 #define FT_UINT32( x ) ( (FT_UInt32)(x) )
162
163
164 #define FT_BYTE_U16( p, i, s ) ( FT_UINT16( FT_BYTE_( p, i ) ) << (s) )
165 #define FT_BYTE_U32( p, i, s ) ( FT_UINT32( FT_BYTE_( p, i ) ) << (s) )
166
167
168 /*
169 * `FT_PEEK_XXX' are generic macros to get data from a buffer position. No
170 * safety checks are performed.
171 */
172 #define FT_PEEK_SHORT( p ) FT_INT16( FT_BYTE_U16( p, 0, 8 ) | \
173 FT_BYTE_U16( p, 1, 0 ) )
174
175 #define FT_PEEK_USHORT( p ) FT_UINT16( FT_BYTE_U16( p, 0, 8 ) | \
176 FT_BYTE_U16( p, 1, 0 ) )
177
178 #define FT_PEEK_LONG( p ) FT_INT32( FT_BYTE_U32( p, 0, 24 ) | \
179 FT_BYTE_U32( p, 1, 16 ) | \
180 FT_BYTE_U32( p, 2, 8 ) | \
181 FT_BYTE_U32( p, 3, 0 ) )
182
183 #define FT_PEEK_ULONG( p ) FT_UINT32( FT_BYTE_U32( p, 0, 24 ) | \
184 FT_BYTE_U32( p, 1, 16 ) | \
185 FT_BYTE_U32( p, 2, 8 ) | \
186 FT_BYTE_U32( p, 3, 0 ) )
187
188 #define FT_PEEK_OFF3( p ) FT_INT32( FT_BYTE_U32( p, 0, 16 ) | \
189 FT_BYTE_U32( p, 1, 8 ) | \
190 FT_BYTE_U32( p, 2, 0 ) )
191
192 #define FT_PEEK_UOFF3( p ) FT_UINT32( FT_BYTE_U32( p, 0, 16 ) | \
193 FT_BYTE_U32( p, 1, 8 ) | \
194 FT_BYTE_U32( p, 2, 0 ) )
195
196 #define FT_PEEK_SHORT_LE( p ) FT_INT16( FT_BYTE_U16( p, 1, 8 ) | \
197 FT_BYTE_U16( p, 0, 0 ) )
198
199 #define FT_PEEK_USHORT_LE( p ) FT_UINT16( FT_BYTE_U16( p, 1, 8 ) | \
200 FT_BYTE_U16( p, 0, 0 ) )
201
202 #define FT_PEEK_LONG_LE( p ) FT_INT32( FT_BYTE_U32( p, 3, 24 ) | \
203 FT_BYTE_U32( p, 2, 16 ) | \
204 FT_BYTE_U32( p, 1, 8 ) | \
205 FT_BYTE_U32( p, 0, 0 ) )
206
207 #define FT_PEEK_ULONG_LE( p ) FT_UINT32( FT_BYTE_U32( p, 3, 24 ) | \
208 FT_BYTE_U32( p, 2, 16 ) | \
209 FT_BYTE_U32( p, 1, 8 ) | \
210 FT_BYTE_U32( p, 0, 0 ) )
211
212 #define FT_PEEK_OFF3_LE( p ) FT_INT32( FT_BYTE_U32( p, 2, 16 ) | \
213 FT_BYTE_U32( p, 1, 8 ) | \
214 FT_BYTE_U32( p, 0, 0 ) )
215
216 #define FT_PEEK_UOFF3_LE( p ) FT_UINT32( FT_BYTE_U32( p, 2, 16 ) | \
217 FT_BYTE_U32( p, 1, 8 ) | \
218 FT_BYTE_U32( p, 0, 0 ) )
219
220 /*
221 * `FT_NEXT_XXX' are generic macros to get data from a buffer position
222 * which is then increased appropriately. No safety checks are performed.
223 */
224 #define FT_NEXT_CHAR( buffer ) \
225 ( (signed char)*buffer++ )
226
227 #define FT_NEXT_BYTE( buffer ) \
228 ( (unsigned char)*buffer++ )
229
230 #define FT_NEXT_SHORT( buffer ) \
231 ( (short)( buffer += 2, FT_PEEK_SHORT( buffer - 2 ) ) )
232
233 #define FT_NEXT_USHORT( buffer ) \
234 ( (unsigned short)( buffer += 2, FT_PEEK_USHORT( buffer - 2 ) ) )
235
236 #define FT_NEXT_OFF3( buffer ) \
237 ( (long)( buffer += 3, FT_PEEK_OFF3( buffer - 3 ) ) )
238
239 #define FT_NEXT_UOFF3( buffer ) \
240 ( (unsigned long)( buffer += 3, FT_PEEK_UOFF3( buffer - 3 ) ) )
241
242 #define FT_NEXT_LONG( buffer ) \
243 ( (long)( buffer += 4, FT_PEEK_LONG( buffer - 4 ) ) )
244
245 #define FT_NEXT_ULONG( buffer ) \
246 ( (unsigned long)( buffer += 4, FT_PEEK_ULONG( buffer - 4 ) ) )
247
248
249 #define FT_NEXT_SHORT_LE( buffer ) \
250 ( (short)( buffer += 2, FT_PEEK_SHORT_LE( buffer - 2 ) ) )
251
252 #define FT_NEXT_USHORT_LE( buffer ) \
253 ( (unsigned short)( buffer += 2, FT_PEEK_USHORT_LE( buffer - 2 ) ) )
254
255 #define FT_NEXT_OFF3_LE( buffer ) \
256 ( (long)( buffer += 3, FT_PEEK_OFF3_LE( buffer - 3 ) ) )
257
258 #define FT_NEXT_UOFF3_LE( buffer ) \
259 ( (unsigned long)( buffer += 3, FT_PEEK_UOFF3_LE( buffer - 3 ) ) )
260
261 #define FT_NEXT_LONG_LE( buffer ) \
262 ( (long)( buffer += 4, FT_PEEK_LONG_LE( buffer - 4 ) ) )
263
264 #define FT_NEXT_ULONG_LE( buffer ) \
265 ( (unsigned long)( buffer += 4, FT_PEEK_ULONG_LE( buffer - 4 ) ) )
266
267
268 /**************************************************************************
269 *
270 * The `FT_GET_XXX` macros use an implicit 'stream' variable.
271 *
272 * Note that a call to `FT_STREAM_SEEK` or `FT_STREAM_POS` has **no**
273 * effect on `FT_GET_XXX`! They operate on `stream->pos`, while
274 * `FT_GET_XXX` use `stream->cursor`.
275 */
276 #if 0
277 #define FT_GET_MACRO( type ) FT_NEXT_ ## type ( stream->cursor )
278
279 #define FT_GET_CHAR() FT_GET_MACRO( CHAR )
280 #define FT_GET_BYTE() FT_GET_MACRO( BYTE )
281 #define FT_GET_SHORT() FT_GET_MACRO( SHORT )
282 #define FT_GET_USHORT() FT_GET_MACRO( USHORT )
283 #define FT_GET_OFF3() FT_GET_MACRO( OFF3 )
284 #define FT_GET_UOFF3() FT_GET_MACRO( UOFF3 )
285 #define FT_GET_LONG() FT_GET_MACRO( LONG )
286 #define FT_GET_ULONG() FT_GET_MACRO( ULONG )
287 #define FT_GET_TAG4() FT_GET_MACRO( ULONG )
288
289 #define FT_GET_SHORT_LE() FT_GET_MACRO( SHORT_LE )
290 #define FT_GET_USHORT_LE() FT_GET_MACRO( USHORT_LE )
291 #define FT_GET_LONG_LE() FT_GET_MACRO( LONG_LE )
292 #define FT_GET_ULONG_LE() FT_GET_MACRO( ULONG_LE )
293
294 #else
295 #define FT_GET_MACRO( func, type ) ( (type)func( stream ) )
296
297 #define FT_GET_CHAR() FT_GET_MACRO( FT_Stream_GetChar, FT_Char )
298 #define FT_GET_BYTE() FT_GET_MACRO( FT_Stream_GetChar, FT_Byte )
299 #define FT_GET_SHORT() FT_GET_MACRO( FT_Stream_GetUShort, FT_Short )
300 #define FT_GET_USHORT() FT_GET_MACRO( FT_Stream_GetUShort, FT_UShort )
301 #define FT_GET_OFF3() FT_GET_MACRO( FT_Stream_GetUOffset, FT_Long )
302 #define FT_GET_UOFF3() FT_GET_MACRO( FT_Stream_GetUOffset, FT_ULong )
303 #define FT_GET_LONG() FT_GET_MACRO( FT_Stream_GetULong, FT_Long )
304 #define FT_GET_ULONG() FT_GET_MACRO( FT_Stream_GetULong, FT_ULong )
305 #define FT_GET_TAG4() FT_GET_MACRO( FT_Stream_GetULong, FT_ULong )
306
307 #define FT_GET_SHORT_LE() FT_GET_MACRO( FT_Stream_GetUShortLE, FT_Short )
308 #define FT_GET_USHORT_LE() FT_GET_MACRO( FT_Stream_GetUShortLE, FT_UShort )
309 #define FT_GET_LONG_LE() FT_GET_MACRO( FT_Stream_GetULongLE, FT_Long )
310 #define FT_GET_ULONG_LE() FT_GET_MACRO( FT_Stream_GetULongLE, FT_ULong )
311 #endif
312
313
314 #define FT_READ_MACRO( func, type, var ) \
315 ( var = (type)func( stream, &error ), \
316 error != FT_Err_Ok )
317
318 /*
319 * The `FT_READ_XXX' macros use implicit `stream' and `error' variables.
320 *
321 * `FT_READ_XXX' can be controlled with `FT_STREAM_SEEK' and
322 * `FT_STREAM_POS'. They use the full machinery to check whether a read is
323 * valid.
324 */
325 #define FT_READ_BYTE( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Byte, var )
326 #define FT_READ_CHAR( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Char, var )
327 #define FT_READ_SHORT( var ) FT_READ_MACRO( FT_Stream_ReadUShort, FT_Short, var )
328 #define FT_READ_USHORT( var ) FT_READ_MACRO( FT_Stream_ReadUShort, FT_UShort, var )
329 #define FT_READ_OFF3( var ) FT_READ_MACRO( FT_Stream_ReadUOffset, FT_Long, var )
330 #define FT_READ_UOFF3( var ) FT_READ_MACRO( FT_Stream_ReadUOffset, FT_ULong, var )
331 #define FT_READ_LONG( var ) FT_READ_MACRO( FT_Stream_ReadULong, FT_Long, var )
332 #define FT_READ_ULONG( var ) FT_READ_MACRO( FT_Stream_ReadULong, FT_ULong, var )
333
334 #define FT_READ_SHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadUShortLE, FT_Short, var )
335 #define FT_READ_USHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadUShortLE, FT_UShort, var )
336 #define FT_READ_LONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadULongLE, FT_Long, var )
337 #define FT_READ_ULONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadULongLE, FT_ULong, var )
338
339
340 #ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM
341
342 /* initialize a stream for reading a regular system stream */
343 FT_BASE( FT_Error )
344 FT_Stream_Open( FT_Stream stream,
345 const char* filepathname );
346
347 #endif /* FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */
348
349
350 /* create a new (input) stream from an FT_Open_Args structure */
351 FT_BASE( FT_Error )
352 FT_Stream_New( FT_Library library,
353 const FT_Open_Args* args,
354 FT_Stream *astream );
355
356 /* free a stream */
357 FT_BASE( void )
358 FT_Stream_Free( FT_Stream stream,
359 FT_Int external );
360
361 /* initialize a stream for reading in-memory data */
362 FT_BASE( void )
363 FT_Stream_OpenMemory( FT_Stream stream,
364 const FT_Byte* base,
365 FT_ULong size );
366
367 /* close a stream (does not destroy the stream structure) */
368 FT_BASE( void )
369 FT_Stream_Close( FT_Stream stream );
370
371
372 /* seek within a stream. position is relative to start of stream */
373 FT_BASE( FT_Error )
374 FT_Stream_Seek( FT_Stream stream,
375 FT_ULong pos );
376
377 /* skip bytes in a stream */
378 FT_BASE( FT_Error )
379 FT_Stream_Skip( FT_Stream stream,
380 FT_Long distance );
381
382 /* return current stream position */
383 FT_BASE( FT_ULong )
384 FT_Stream_Pos( FT_Stream stream );
385
386 /* read bytes from a stream into a user-allocated buffer, returns an */
387 /* error if not all bytes could be read. */
388 FT_BASE( FT_Error )
389 FT_Stream_Read( FT_Stream stream,
390 FT_Byte* buffer,
391 FT_ULong count );
392
393 /* read bytes from a stream at a given position */
394 FT_BASE( FT_Error )
395 FT_Stream_ReadAt( FT_Stream stream,
396 FT_ULong pos,
397 FT_Byte* buffer,
398 FT_ULong count );
399
400 /* try to read bytes at the end of a stream; return number of bytes */
401 /* really available */
402 FT_BASE( FT_ULong )
403 FT_Stream_TryRead( FT_Stream stream,
404 FT_Byte* buffer,
405 FT_ULong count );
406
407 /* Enter a frame of `count' consecutive bytes in a stream. Returns an */
408 /* error if the frame could not be read/accessed. The caller can use */
409 /* the `FT_Stream_GetXXX' functions to retrieve frame data without */
410 /* error checks. */
411 /* */
412 /* You must _always_ call `FT_Stream_ExitFrame' once you have entered */
413 /* a stream frame! */
414 /* */
415 /* Nested frames are not permitted. */
416 /* */
417 FT_BASE( FT_Error )
418 FT_Stream_EnterFrame( FT_Stream stream,
419 FT_ULong count );
420
421 /* exit a stream frame */
422 FT_BASE( void )
423 FT_Stream_ExitFrame( FT_Stream stream );
424
425
426 /* Extract a stream frame. If the stream is disk-based, a heap block */
427 /* is allocated and the frame bytes are read into it. If the stream */
428 /* is memory-based, this function simply sets a pointer to the data. */
429 /* */
430 /* Useful to optimize access to memory-based streams transparently. */
431 /* */
432 /* `FT_Stream_GetXXX' functions can't be used. */
433 /* */
434 /* An extracted frame must be `freed' with a call to the function */
435 /* `FT_Stream_ReleaseFrame'. */
436 /* */
437 FT_BASE( FT_Error )
438 FT_Stream_ExtractFrame( FT_Stream stream,
439 FT_ULong count,
440 FT_Byte** pbytes );
441
442 /* release an extract frame (see `FT_Stream_ExtractFrame') */
443 FT_BASE( void )
444 FT_Stream_ReleaseFrame( FT_Stream stream,
445 FT_Byte** pbytes );
446
447
448 /* read a byte from an entered frame */
449 FT_BASE( FT_Char )
450 FT_Stream_GetChar( FT_Stream stream );
451
452 /* read a 16-bit big-endian unsigned integer from an entered frame */
453 FT_BASE( FT_UShort )
454 FT_Stream_GetUShort( FT_Stream stream );
455
456 /* read a 24-bit big-endian unsigned integer from an entered frame */
457 FT_BASE( FT_ULong )
458 FT_Stream_GetUOffset( FT_Stream stream );
459
460 /* read a 32-bit big-endian unsigned integer from an entered frame */
461 FT_BASE( FT_ULong )
462 FT_Stream_GetULong( FT_Stream stream );
463
464 /* read a 16-bit little-endian unsigned integer from an entered frame */
465 FT_BASE( FT_UShort )
466 FT_Stream_GetUShortLE( FT_Stream stream );
467
468 /* read a 32-bit little-endian unsigned integer from an entered frame */
469 FT_BASE( FT_ULong )
470 FT_Stream_GetULongLE( FT_Stream stream );
471
472
473 /* read a byte from a stream */
474 FT_BASE( FT_Char )
475 FT_Stream_ReadChar( FT_Stream stream,
476 FT_Error* error );
477
478 /* read a 16-bit big-endian unsigned integer from a stream */
479 FT_BASE( FT_UShort )
480 FT_Stream_ReadUShort( FT_Stream stream,
481 FT_Error* error );
482
483 /* read a 24-bit big-endian unsigned integer from a stream */
484 FT_BASE( FT_ULong )
485 FT_Stream_ReadUOffset( FT_Stream stream,
486 FT_Error* error );
487
488 /* read a 32-bit big-endian integer from a stream */
489 FT_BASE( FT_ULong )
490 FT_Stream_ReadULong( FT_Stream stream,
491 FT_Error* error );
492
493 /* read a 16-bit little-endian unsigned integer from a stream */
494 FT_BASE( FT_UShort )
495 FT_Stream_ReadUShortLE( FT_Stream stream,
496 FT_Error* error );
497
498 /* read a 32-bit little-endian unsigned integer from a stream */
499 FT_BASE( FT_ULong )
500 FT_Stream_ReadULongLE( FT_Stream stream,
501 FT_Error* error );
502
503 /* Read a structure from a stream. The structure must be described */
504 /* by an array of FT_Frame_Field records. */
505 FT_BASE( FT_Error )
506 FT_Stream_ReadFields( FT_Stream stream,
507 const FT_Frame_Field* fields,
508 void* structure );
509
510
511 #define FT_STREAM_POS() \
512 FT_Stream_Pos( stream )
513
514 #define FT_STREAM_SEEK( position ) \
515 FT_SET_ERROR( FT_Stream_Seek( stream, \
516 (FT_ULong)(position) ) )
517
518 #define FT_STREAM_SKIP( distance ) \
519 FT_SET_ERROR( FT_Stream_Skip( stream, \
520 (FT_Long)(distance) ) )
521
522 #define FT_STREAM_READ( buffer, count ) \
523 FT_SET_ERROR( FT_Stream_Read( stream, \
524 (FT_Byte*)(buffer), \
525 (FT_ULong)(count) ) )
526
527 #define FT_STREAM_READ_AT( position, buffer, count ) \
528 FT_SET_ERROR( FT_Stream_ReadAt( stream, \
529 (FT_ULong)(position), \
530 (FT_Byte*)(buffer), \
531 (FT_ULong)(count) ) )
532
533 #define FT_STREAM_READ_FIELDS( fields, object ) \
534 FT_SET_ERROR( FT_Stream_ReadFields( stream, fields, object ) )
535
536
537 #define FT_FRAME_ENTER( size ) \
538 FT_SET_ERROR( \
539 FT_DEBUG_INNER( FT_Stream_EnterFrame( stream, \
540 (FT_ULong)(size) ) ) )
541
542 #define FT_FRAME_EXIT() \
543 FT_DEBUG_INNER( FT_Stream_ExitFrame( stream ) )
544
545 #define FT_FRAME_EXTRACT( size, bytes ) \
546 FT_SET_ERROR( \
547 FT_DEBUG_INNER( FT_Stream_ExtractFrame( stream, \
548 (FT_ULong)(size), \
549 (FT_Byte**)&(bytes) ) ) )
550
551 #define FT_FRAME_RELEASE( bytes ) \
552 FT_DEBUG_INNER( FT_Stream_ReleaseFrame( stream, \
553 (FT_Byte**)&(bytes) ) )
554
555
556 FT_END_HEADER
557
558 #endif /* FTSTREAM_H_ */
559
560
561 /* END */