1 /***************************************************************************/
2 /* */
3 /* psmodule.c */
4 /* */
5 /* PSNames module implementation (body). */
6 /* */
7 /* Copyright 1996-2018 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 #include <ft2build.h>
20 #include FT_INTERNAL_DEBUG_H
21 #include FT_INTERNAL_OBJECTS_H
22 #include FT_SERVICE_POSTSCRIPT_CMAPS_H
23
24 #include "psmodule.h"
25
26 /*
27 * The file `pstables.h' with its arrays and its function
28 * `ft_get_adobe_glyph_index' is useful for other projects also (for
29 * example, `pdfium' is using it). However, if used as a C++ header,
30 * including it in two different source files makes it necessary to use
31 * `extern const' for the declaration of its arrays, otherwise the data
32 * would be duplicated as mandated by the C++ standard.
33 *
34 * For this reason, we use `DEFINE_PS_TABLES' to guard the function
35 * definitions, and `DEFINE_PS_TABLES_DATA' to provide both proper array
36 * declarations and definitions.
37 */
38 #include "pstables.h"
39 #define DEFINE_PS_TABLES
40 #define DEFINE_PS_TABLES_DATA
41 #include "pstables.h"
42
43 #include "psnamerr.h"
44 #include "pspic.h"
45
46
47 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
48
49
50 #ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST
51
52
53 #define VARIANT_BIT 0x80000000UL
54 #define BASE_GLYPH( code ) ( (FT_UInt32)( (code) & ~VARIANT_BIT ) )
55
56
57 /* Return the Unicode value corresponding to a given glyph. Note that */
58 /* we do deal with glyph variants by detecting a non-initial dot in */
59 /* the name, as in `A.swash' or `e.final'; in this case, the */
60 /* VARIANT_BIT is set in the return value. */
61 /* */
62 static FT_UInt32
63 ps_unicode_value( const char* glyph_name )
64 {
65 /* If the name begins with `uni', then the glyph name may be a */
66 /* hard-coded unicode character code. */
67 if ( glyph_name[0] == 'u' &&
68 glyph_name[1] == 'n' &&
69 glyph_name[2] == 'i' )
70 {
71 /* determine whether the next four characters following are */
72 /* hexadecimal. */
73
74 /* XXX: Add code to deal with ligatures, i.e. glyph names like */
75 /* `uniXXXXYYYYZZZZ'... */
76
77 FT_Int count;
78 FT_UInt32 value = 0;
79 const char* p = glyph_name + 3;
80
81
82 for ( count = 4; count > 0; count--, p++ )
83 {
84 char c = *p;
85 unsigned int d;
86
87
88 d = (unsigned char)c - '0';
89 if ( d >= 10 )
90 {
91 d = (unsigned char)c - 'A';
92 if ( d >= 6 )
93 d = 16;
94 else
95 d += 10;
96 }
97
98 /* Exit if a non-uppercase hexadecimal character was found */
99 /* -- this also catches character codes below `0' since such */
100 /* negative numbers cast to `unsigned int' are far too big. */
101 if ( d >= 16 )
102 break;
103
104 value = ( value << 4 ) + d;
105 }
106
107 /* there must be exactly four hex digits */
108 if ( count == 0 )
109 {
110 if ( *p == '\0' )
111 return value;
112 if ( *p == '.' )
113 return (FT_UInt32)( value | VARIANT_BIT );
114 }
115 }
116
117 /* If the name begins with `u', followed by four to six uppercase */
118 /* hexadecimal digits, it is a hard-coded unicode character code. */
119 if ( glyph_name[0] == 'u' )
120 {
121 FT_Int count;
122 FT_UInt32 value = 0;
123 const char* p = glyph_name + 1;
124
125
126 for ( count = 6; count > 0; count--, p++ )
127 {
128 char c = *p;
129 unsigned int d;
130
131
132 d = (unsigned char)c - '0';
133 if ( d >= 10 )
134 {
135 d = (unsigned char)c - 'A';
136 if ( d >= 6 )
137 d = 16;
138 else
139 d += 10;
140 }
141
142 if ( d >= 16 )
143 break;
144
145 value = ( value << 4 ) + d;
146 }
147
148 if ( count <= 2 )
149 {
150 if ( *p == '\0' )
151 return value;
152 if ( *p == '.' )
153 return (FT_UInt32)( value | VARIANT_BIT );
154 }
155 }
156
157 /* Look for a non-initial dot in the glyph name in order to */
158 /* find variants like `A.swash', `e.final', etc. */
159 {
160 const char* p = glyph_name;
161 const char* dot = NULL;
162
163
164 for ( ; *p; p++ )
165 {
166 if ( *p == '.' && p > glyph_name )
167 {
168 dot = p;
169 break;
170 }
171 }
172
173 /* now look up the glyph in the Adobe Glyph List */
174 if ( !dot )
175 return (FT_UInt32)ft_get_adobe_glyph_index( glyph_name, p );
176 else
177 return (FT_UInt32)( ft_get_adobe_glyph_index( glyph_name, dot ) |
178 VARIANT_BIT );
179 }
180 }
181
182
183 /* ft_qsort callback to sort the unicode map */
184 FT_CALLBACK_DEF( int )
185 compare_uni_maps( const void* a,
186 const void* b )
187 {
188 PS_UniMap* map1 = (PS_UniMap*)a;
189 PS_UniMap* map2 = (PS_UniMap*)b;
190 FT_UInt32 unicode1 = BASE_GLYPH( map1->unicode );
191 FT_UInt32 unicode2 = BASE_GLYPH( map2->unicode );
192
193
194 /* sort base glyphs before glyph variants */
195 if ( unicode1 == unicode2 )
196 {
197 if ( map1->unicode > map2->unicode )
198 return 1;
199 else if ( map1->unicode < map2->unicode )
200 return -1;
201 else
202 return 0;
203 }
204 else
205 {
206 if ( unicode1 > unicode2 )
207 return 1;
208 else if ( unicode1 < unicode2 )
209 return -1;
210 else
211 return 0;
212 }
213 }
214
215
216 /* support for extra glyphs not handled (well) in AGL; */
217 /* we add extra mappings for them if necessary */
218
219 #define EXTRA_GLYPH_LIST_SIZE 10
220
221 static const FT_UInt32 ft_extra_glyph_unicodes[EXTRA_GLYPH_LIST_SIZE] =
222 {
223 /* WGL 4 */
224 0x0394,
225 0x03A9,
226 0x2215,
227 0x00AD,
228 0x02C9,
229 0x03BC,
230 0x2219,
231 0x00A0,
232 /* Romanian */
233 0x021A,
234 0x021B
235 };
236
237 static const char ft_extra_glyph_names[] =
238 {
239 'D','e','l','t','a',0,
240 'O','m','e','g','a',0,
241 'f','r','a','c','t','i','o','n',0,
242 'h','y','p','h','e','n',0,
243 'm','a','c','r','o','n',0,
244 'm','u',0,
245 'p','e','r','i','o','d','c','e','n','t','e','r','e','d',0,
246 's','p','a','c','e',0,
247 'T','c','o','m','m','a','a','c','c','e','n','t',0,
248 't','c','o','m','m','a','a','c','c','e','n','t',0
249 };
250
251 static const FT_Int
252 ft_extra_glyph_name_offsets[EXTRA_GLYPH_LIST_SIZE] =
253 {
254 0,
255 6,
256 12,
257 21,
258 28,
259 35,
260 38,
261 53,
262 59,
263 72
264 };
265
266
267 static void
268 ps_check_extra_glyph_name( const char* gname,
269 FT_UInt glyph,
270 FT_UInt* extra_glyphs,
271 FT_UInt *states )
272 {
273 FT_UInt n;
274
275
276 for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ )
277 {
278 if ( ft_strcmp( ft_extra_glyph_names +
279 ft_extra_glyph_name_offsets[n], gname ) == 0 )
280 {
281 if ( states[n] == 0 )
282 {
283 /* mark this extra glyph as a candidate for the cmap */
284 states[n] = 1;
285 extra_glyphs[n] = glyph;
286 }
287
288 return;
289 }
290 }
291 }
292
293
294 static void
295 ps_check_extra_glyph_unicode( FT_UInt32 uni_char,
296 FT_UInt *states )
297 {
298 FT_UInt n;
299
300
301 for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ )
302 {
303 if ( uni_char == ft_extra_glyph_unicodes[n] )
304 {
305 /* disable this extra glyph from being added to the cmap */
306 states[n] = 2;
307
308 return;
309 }
310 }
311 }
312
313
314 /* Build a table that maps Unicode values to glyph indices. */
315 static FT_Error
316 ps_unicodes_init( FT_Memory memory,
317 PS_Unicodes table,
318 FT_UInt num_glyphs,
319 PS_GetGlyphNameFunc get_glyph_name,
320 PS_FreeGlyphNameFunc free_glyph_name,
321 FT_Pointer glyph_data )
322 {
323 FT_Error error;
324
325 FT_UInt extra_glyph_list_states[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
326 FT_UInt extra_glyphs[EXTRA_GLYPH_LIST_SIZE];
327
328
329 /* we first allocate the table */
330 table->num_maps = 0;
331 table->maps = NULL;
332
333 if ( !FT_NEW_ARRAY( table->maps, num_glyphs + EXTRA_GLYPH_LIST_SIZE ) )
334 {
335 FT_UInt n;
336 FT_UInt count;
337 PS_UniMap* map;
338 FT_UInt32 uni_char;
339
340
341 map = table->maps;
342
343 for ( n = 0; n < num_glyphs; n++ )
344 {
345 const char* gname = get_glyph_name( glyph_data, n );
346
347
348 if ( gname )
349 {
350 ps_check_extra_glyph_name( gname, n,
351 extra_glyphs, extra_glyph_list_states );
352 uni_char = ps_unicode_value( gname );
353
354 if ( BASE_GLYPH( uni_char ) != 0 )
355 {
356 ps_check_extra_glyph_unicode( uni_char,
357 extra_glyph_list_states );
358 map->unicode = uni_char;
359 map->glyph_index = n;
360 map++;
361 }
362
363 if ( free_glyph_name )
364 free_glyph_name( glyph_data, gname );
365 }
366 }
367
368 for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ )
369 {
370 if ( extra_glyph_list_states[n] == 1 )
371 {
372 /* This glyph name has an additional representation. */
373 /* Add it to the cmap. */
374
375 map->unicode = ft_extra_glyph_unicodes[n];
376 map->glyph_index = extra_glyphs[n];
377 map++;
378 }
379 }
380
381 /* now compress the table a bit */
382 count = (FT_UInt)( map - table->maps );
383
384 if ( count == 0 )
385 {
386 /* No unicode chars here! */
387 FT_FREE( table->maps );
388 if ( !error )
389 error = FT_THROW( No_Unicode_Glyph_Name );
390 }
391 else
392 {
393 /* Reallocate if the number of used entries is much smaller. */
394 if ( count < num_glyphs / 2 )
395 {
396 (void)FT_RENEW_ARRAY( table->maps, num_glyphs, count );
397 error = FT_Err_Ok;
398 }
399
400 /* Sort the table in increasing order of unicode values, */
401 /* taking care of glyph variants. */
402 ft_qsort( table->maps, count, sizeof ( PS_UniMap ),
403 compare_uni_maps );
404 }
405
406 table->num_maps = count;
407 }
408
409 return error;
410 }
411
412
413 static FT_UInt
414 ps_unicodes_char_index( PS_Unicodes table,
415 FT_UInt32 unicode )
416 {
417 PS_UniMap *min, *max, *mid, *result = NULL;
418
419
420 /* Perform a binary search on the table. */
421
422 min = table->maps;
423 max = min + table->num_maps - 1;
424
425 while ( min <= max )
426 {
427 FT_UInt32 base_glyph;
428
429
430 mid = min + ( ( max - min ) >> 1 );
431
432 if ( mid->unicode == unicode )
433 {
434 result = mid;
435 break;
436 }
437
438 base_glyph = BASE_GLYPH( mid->unicode );
439
440 if ( base_glyph == unicode )
441 result = mid; /* remember match but continue search for base glyph */
442
443 if ( min == max )
444 break;
445
446 if ( base_glyph < unicode )
447 min = mid + 1;
448 else
449 max = mid - 1;
450 }
451
452 if ( result )
453 return result->glyph_index;
454 else
455 return 0;
456 }
457
458
459 static FT_UInt32
460 ps_unicodes_char_next( PS_Unicodes table,
461 FT_UInt32 *unicode )
462 {
463 FT_UInt result = 0;
464 FT_UInt32 char_code = *unicode + 1;
465
466
467 {
468 FT_UInt min = 0;
469 FT_UInt max = table->num_maps;
470 FT_UInt mid;
471 PS_UniMap* map;
472 FT_UInt32 base_glyph;
473
474
475 while ( min < max )
476 {
477 mid = min + ( ( max - min ) >> 1 );
478 map = table->maps + mid;
479
480 if ( map->unicode == char_code )
481 {
482 result = map->glyph_index;
483 goto Exit;
484 }
485
486 base_glyph = BASE_GLYPH( map->unicode );
487
488 if ( base_glyph == char_code )
489 result = map->glyph_index;
490
491 if ( base_glyph < char_code )
492 min = mid + 1;
493 else
494 max = mid;
495 }
496
497 if ( result )
498 goto Exit; /* we have a variant glyph */
499
500 /* we didn't find it; check whether we have a map just above it */
501 char_code = 0;
502
503 if ( min < table->num_maps )
504 {
505 map = table->maps + min;
506 result = map->glyph_index;
507 char_code = BASE_GLYPH( map->unicode );
508 }
509 }
510
511 Exit:
512 *unicode = char_code;
513 return result;
514 }
515
516
517 #endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */
518
519
520 static const char*
521 ps_get_macintosh_name( FT_UInt name_index )
522 {
523 if ( name_index >= FT_NUM_MAC_NAMES )
524 name_index = 0;
525
526 return ft_standard_glyph_names + ft_mac_names[name_index];
527 }
528
529
530 static const char*
531 ps_get_standard_strings( FT_UInt sid )
532 {
533 if ( sid >= FT_NUM_SID_NAMES )
534 return 0;
535
536 return ft_standard_glyph_names + ft_sid_names[sid];
537 }
538
539
540 #ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST
541
542 FT_DEFINE_SERVICE_PSCMAPSREC(
543 pscmaps_interface,
544
545 (PS_Unicode_ValueFunc) ps_unicode_value, /* unicode_value */
546 (PS_Unicodes_InitFunc) ps_unicodes_init, /* unicodes_init */
547 (PS_Unicodes_CharIndexFunc)ps_unicodes_char_index, /* unicodes_char_index */
548 (PS_Unicodes_CharNextFunc) ps_unicodes_char_next, /* unicodes_char_next */
549
550 (PS_Macintosh_NameFunc) ps_get_macintosh_name, /* macintosh_name */
551 (PS_Adobe_Std_StringsFunc) ps_get_standard_strings, /* adobe_std_strings */
552
553 t1_standard_encoding, /* adobe_std_encoding */
554 t1_expert_encoding /* adobe_expert_encoding */
555 )
556
557 #else
558
559 FT_DEFINE_SERVICE_PSCMAPSREC(
560 pscmaps_interface,
561
562 NULL, /* unicode_value */
563 NULL, /* unicodes_init */
564 NULL, /* unicodes_char_index */
565 NULL, /* unicodes_char_next */
566
567 (PS_Macintosh_NameFunc) ps_get_macintosh_name, /* macintosh_name */
568 (PS_Adobe_Std_StringsFunc) ps_get_standard_strings, /* adobe_std_strings */
569
570 t1_standard_encoding, /* adobe_std_encoding */
571 t1_expert_encoding /* adobe_expert_encoding */
572 )
573
574 #endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */
575
576
577 FT_DEFINE_SERVICEDESCREC1(
578 pscmaps_services,
579
580 FT_SERVICE_ID_POSTSCRIPT_CMAPS, &PSCMAPS_INTERFACE_GET )
581
582
583 static FT_Pointer
584 psnames_get_service( FT_Module module,
585 const char* service_id )
586 {
587 /* PSCMAPS_SERVICES_GET dereferences `library' in PIC mode */
588 #ifdef FT_CONFIG_OPTION_PIC
589 FT_Library library;
590
591
592 if ( !module )
593 return NULL;
594 library = module->library;
595 if ( !library )
596 return NULL;
597 #else
598 FT_UNUSED( module );
599 #endif
600
601 return ft_service_list_lookup( PSCMAPS_SERVICES_GET, service_id );
602 }
603
604 #endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
605
606
607 #ifndef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
608 #define PUT_PS_NAMES_SERVICE( a ) NULL
609 #else
610 #define PUT_PS_NAMES_SERVICE( a ) a
611 #endif
612
613 FT_DEFINE_MODULE(
614 psnames_module_class,
615
616 0, /* this is not a font driver, nor a renderer */
617 sizeof ( FT_ModuleRec ),
618
619 "psnames", /* driver name */
620 0x10000L, /* driver version */
621 0x20000L, /* driver requires FreeType 2 or above */
622
623 PUT_PS_NAMES_SERVICE(
624 (void*)&PSCMAPS_INTERFACE_GET ), /* module specific interface */
625
626 (FT_Module_Constructor)NULL, /* module_init */
627 (FT_Module_Destructor) NULL, /* module_done */
628 (FT_Module_Requester) PUT_PS_NAMES_SERVICE( psnames_get_service ) /* get_interface */
629 )
630
631
632 /* END */