1 /****************************************************************************
2 *
3 * ttpost.c
4 *
5 * PostScript name table processing for TrueType and OpenType fonts
6 * (body).
7 *
8 * Copyright (C) 1996-2023 by
9 * David Turner, Robert Wilhelm, and Werner Lemberg.
10 *
11 * This file is part of the FreeType project, and may only be used,
12 * modified, and distributed under the terms of the FreeType project
13 * license, LICENSE.TXT. By continuing to use, modify, or distribute
14 * this file you indicate that you have read the license and
15 * understand and accept it fully.
16 *
17 */
18
19 /**************************************************************************
20 *
21 * The post table is not completely loaded by the core engine. This
22 * file loads the missing PS glyph names and implements an API to access
23 * them.
24 *
25 */
26
27
28 #include <freetype/internal/ftdebug.h>
29 #include <freetype/internal/ftstream.h>
30 #include <freetype/tttags.h>
31
32
33 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
34
35 #include "ttpost.h"
36
37 #include "sferrors.h"
38
39
40 /**************************************************************************
41 *
42 * The macro FT_COMPONENT is used in trace mode. It is an implicit
43 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
44 * messages during execution.
45 */
46 #undef FT_COMPONENT
47 #define FT_COMPONENT ttpost
48
49
50 /* If this configuration macro is defined, we rely on the `psnames' */
51 /* module to grab the glyph names. */
52
53 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
54
55
56 #include <freetype/internal/services/svpscmap.h>
57
58 #define MAC_NAME( x ) (FT_String*)psnames->macintosh_name( (FT_UInt)(x) )
59
60
61 #else /* !FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
62
63
64 /* Otherwise, we ignore the `psnames' module, and provide our own */
65 /* table of Mac names. Thus, it is possible to build a version of */
66 /* FreeType without the Type 1 driver & psnames module. */
67
68 #define MAC_NAME( x ) (FT_String*)tt_post_default_names[x]
69
70 /* the 258 default Mac PS glyph names; see file `tools/glnames.py' */
71
72 static const FT_String* const tt_post_default_names[258] =
73 {
74 /* 0 */
75 ".notdef", ".null", "nonmarkingreturn", "space", "exclam",
76 "quotedbl", "numbersign", "dollar", "percent", "ampersand",
77 /* 10 */
78 "quotesingle", "parenleft", "parenright", "asterisk", "plus",
79 "comma", "hyphen", "period", "slash", "zero",
80 /* 20 */
81 "one", "two", "three", "four", "five",
82 "six", "seven", "eight", "nine", "colon",
83 /* 30 */
84 "semicolon", "less", "equal", "greater", "question",
85 "at", "A", "B", "C", "D",
86 /* 40 */
87 "E", "F", "G", "H", "I",
88 "J", "K", "L", "M", "N",
89 /* 50 */
90 "O", "P", "Q", "R", "S",
91 "T", "U", "V", "W", "X",
92 /* 60 */
93 "Y", "Z", "bracketleft", "backslash", "bracketright",
94 "asciicircum", "underscore", "grave", "a", "b",
95 /* 70 */
96 "c", "d", "e", "f", "g",
97 "h", "i", "j", "k", "l",
98 /* 80 */
99 "m", "n", "o", "p", "q",
100 "r", "s", "t", "u", "v",
101 /* 90 */
102 "w", "x", "y", "z", "braceleft",
103 "bar", "braceright", "asciitilde", "Adieresis", "Aring",
104 /* 100 */
105 "Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis",
106 "aacute", "agrave", "acircumflex", "adieresis", "atilde",
107 /* 110 */
108 "aring", "ccedilla", "eacute", "egrave", "ecircumflex",
109 "edieresis", "iacute", "igrave", "icircumflex", "idieresis",
110 /* 120 */
111 "ntilde", "oacute", "ograve", "ocircumflex", "odieresis",
112 "otilde", "uacute", "ugrave", "ucircumflex", "udieresis",
113 /* 130 */
114 "dagger", "degree", "cent", "sterling", "section",
115 "bullet", "paragraph", "germandbls", "registered", "copyright",
116 /* 140 */
117 "trademark", "acute", "dieresis", "notequal", "AE",
118 "Oslash", "infinity", "plusminus", "lessequal", "greaterequal",
119 /* 150 */
120 "yen", "mu", "partialdiff", "summation", "product",
121 "pi", "integral", "ordfeminine", "ordmasculine", "Omega",
122 /* 160 */
123 "ae", "oslash", "questiondown", "exclamdown", "logicalnot",
124 "radical", "florin", "approxequal", "Delta", "guillemotleft",
125 /* 170 */
126 "guillemotright", "ellipsis", "nonbreakingspace", "Agrave", "Atilde",
127 "Otilde", "OE", "oe", "endash", "emdash",
128 /* 180 */
129 "quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide",
130 "lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
131 /* 190 */
132 "guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl",
133 "periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
134 /* 200 */
135 "Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
136 "Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
137 /* 210 */
138 "apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave",
139 "dotlessi", "circumflex", "tilde", "macron", "breve",
140 /* 220 */
141 "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek",
142 "caron", "Lslash", "lslash", "Scaron", "scaron",
143 /* 230 */
144 "Zcaron", "zcaron", "brokenbar", "Eth", "eth",
145 "Yacute", "yacute", "Thorn", "thorn", "minus",
146 /* 240 */
147 "multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf",
148 "onequarter", "threequarters", "franc", "Gbreve", "gbreve",
149 /* 250 */
150 "Idotaccent", "Scedilla", "scedilla", "Cacute", "cacute",
151 "Ccaron", "ccaron", "dcroat",
152 };
153
154
155 #endif /* !FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
156
157
158 static FT_Error
159 load_format_20( TT_Post_Names names,
160 FT_Stream stream,
161 FT_UShort num_glyphs,
162 FT_ULong post_len )
163 {
164 FT_Memory memory = stream->memory;
165 FT_Error error;
166
167 FT_UShort n;
168 FT_UShort num_names = 0;
169
170 FT_UShort* glyph_indices = NULL;
171 FT_Byte** name_strings = NULL;
172 FT_Byte* q;
173
174
175 if ( (FT_ULong)num_glyphs * 2 > post_len )
176 {
177 error = FT_THROW( Invalid_File_Format );
178 goto Exit;
179 }
180
181 /* load the indices and note their maximum */
182 if ( FT_QNEW_ARRAY( glyph_indices, num_glyphs ) ||
183 FT_FRAME_ENTER( num_glyphs * 2 ) )
184 goto Fail;
185
186 q = (FT_Byte*)stream->cursor;
187
188 for ( n = 0; n < num_glyphs; n++ )
189 {
190 FT_UShort idx = FT_NEXT_USHORT( q );
191
192
193 if ( idx > num_names )
194 num_names = idx;
195
196 glyph_indices[n] = idx;
197 }
198
199 FT_FRAME_EXIT();
200
201 /* compute number of names stored in the table */
202 num_names = num_names > 257 ? num_names - 257 : 0;
203
204 /* now load the name strings */
205 if ( num_names )
206 {
207 FT_ULong p;
208 FT_Byte* strings;
209
210
211 post_len -= (FT_ULong)num_glyphs * 2;
212
213 if ( FT_QALLOC( name_strings, num_names * sizeof ( FT_Byte* ) +
214 post_len + 1 ) )
215 goto Fail;
216
217 strings = (FT_Byte*)( name_strings + num_names );
218 if ( FT_STREAM_READ( strings, post_len ) )
219 goto Fail;
220
221 /* convert from Pascal- to C-strings and set pointers */
222 for ( p = 0, n = 0; p < post_len && n < num_names; n++ )
223 {
224 FT_UInt len = strings[p];
225
226
227 if ( len > 63U )
228 {
229 error = FT_THROW( Invalid_File_Format );
230 goto Fail;
231 }
232
233 strings[p] = 0;
234 name_strings[n] = strings + p + 1;
235 p += len + 1;
236 }
237 strings[post_len] = 0;
238
239 /* deal with missing or insufficient string data */
240 if ( n < num_names )
241 {
242 FT_TRACE4(( "load_format_20: %hu PostScript names are truncated\n",
243 num_names - n ));
244
245 for ( ; n < num_names; n++ )
246 name_strings[n] = strings + post_len;
247 }
248 }
249
250 /* all right, set table fields and exit successfully */
251 names->num_glyphs = num_glyphs;
252 names->num_names = num_names;
253 names->glyph_indices = glyph_indices;
254 names->glyph_names = name_strings;
255
256 return FT_Err_Ok;
257
258 Fail:
259 FT_FREE( name_strings );
260 FT_FREE( glyph_indices );
261
262 Exit:
263 return error;
264 }
265
266
267 static FT_Error
268 load_format_25( TT_Post_Names names,
269 FT_Stream stream,
270 FT_UShort num_glyphs,
271 FT_ULong post_len )
272 {
273 FT_Memory memory = stream->memory;
274 FT_Error error;
275
276 FT_UShort n;
277 FT_UShort* glyph_indices = NULL;
278 FT_Byte* q;
279
280
281 /* check the number of glyphs, including the theoretical limit */
282 if ( num_glyphs > post_len ||
283 num_glyphs > 258 + 128 )
284 {
285 error = FT_THROW( Invalid_File_Format );
286 goto Exit;
287 }
288
289 /* load the indices and check their Mac range */
290 if ( FT_QNEW_ARRAY( glyph_indices, num_glyphs ) ||
291 FT_FRAME_ENTER( num_glyphs ) )
292 goto Fail;
293
294 q = (FT_Byte*)stream->cursor;
295
296 for ( n = 0; n < num_glyphs; n++ )
297 {
298 FT_Int idx = n + FT_NEXT_CHAR( q );
299
300
301 if ( idx < 0 || idx > 257 )
302 idx = 0;
303
304 glyph_indices[n] = (FT_UShort)idx;
305 }
306
307 FT_FRAME_EXIT();
308
309 /* OK, set table fields and exit successfully */
310 names->num_glyphs = num_glyphs;
311 names->glyph_indices = glyph_indices;
312
313 return FT_Err_Ok;
314
315 Fail:
316 FT_FREE( glyph_indices );
317
318 Exit:
319 return error;
320 }
321
322
323 static FT_Error
324 load_post_names( TT_Face face )
325 {
326 FT_Error error = FT_Err_Ok;
327 FT_Stream stream = face->root.stream;
328 FT_Fixed format = face->postscript.FormatType;
329 FT_ULong post_len;
330 FT_UShort num_glyphs;
331
332
333 /* seek to the beginning of the PS names table */
334 error = face->goto_table( face, TTAG_post, stream, &post_len );
335 if ( error )
336 goto Exit;
337
338 /* UNDOCUMENTED! The number of glyphs in this table can be smaller */
339 /* than the value in the maxp table (cf. cyberbit.ttf). */
340 if ( post_len < 34 ||
341 FT_STREAM_SKIP( 32 ) ||
342 FT_READ_USHORT( num_glyphs ) ||
343 num_glyphs > face->max_profile.numGlyphs ||
344 num_glyphs == 0 )
345 goto Exit;
346
347 /* now read postscript names data */
348 if ( format == 0x00020000L )
349 error = load_format_20( &face->postscript_names, stream,
350 num_glyphs, post_len - 34 );
351 else if ( format == 0x00025000L )
352 error = load_format_25( &face->postscript_names, stream,
353 num_glyphs, post_len - 34 );
354
355 Exit:
356 face->postscript_names.loaded = 1; /* even if failed */
357 return error;
358 }
359
360
361 FT_LOCAL_DEF( void )
362 tt_face_free_ps_names( TT_Face face )
363 {
364 FT_Memory memory = face->root.memory;
365 TT_Post_Names names = &face->postscript_names;
366
367
368 if ( names->num_glyphs )
369 {
370 FT_FREE( names->glyph_indices );
371 names->num_glyphs = 0;
372 }
373
374 if ( names->num_names )
375 {
376 FT_FREE( names->glyph_names );
377 names->num_names = 0;
378 }
379
380 names->loaded = 0;
381 }
382
383
384 /**************************************************************************
385 *
386 * @Function:
387 * tt_face_get_ps_name
388 *
389 * @Description:
390 * Get the PostScript glyph name of a glyph.
391 *
392 * @Input:
393 * face ::
394 * A handle to the parent face.
395 *
396 * idx ::
397 * The glyph index.
398 *
399 * @InOut:
400 * PSname ::
401 * The address of a string pointer. Undefined in case of
402 * error, otherwise it is a pointer to the glyph name.
403 *
404 * You must not modify the returned string!
405 *
406 * @Output:
407 * FreeType error code. 0 means success.
408 */
409 FT_LOCAL_DEF( FT_Error )
410 tt_face_get_ps_name( TT_Face face,
411 FT_UInt idx,
412 FT_String** PSname )
413 {
414 FT_Error error;
415 FT_Fixed format;
416
417 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
418 FT_Service_PsCMaps psnames;
419 #endif
420
421
422 if ( !face )
423 return FT_THROW( Invalid_Face_Handle );
424
425 if ( idx >= (FT_UInt)face->max_profile.numGlyphs )
426 return FT_THROW( Invalid_Glyph_Index );
427
428 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
429 psnames = (FT_Service_PsCMaps)face->psnames;
430 if ( !psnames )
431 return FT_THROW( Unimplemented_Feature );
432 #endif
433
434 /* `.notdef' by default */
435 *PSname = MAC_NAME( 0 );
436
437 format = face->postscript.FormatType;
438
439 if ( format == 0x00010000L )
440 {
441 if ( idx < 258 ) /* paranoid checking */
442 *PSname = MAC_NAME( idx );
443 }
444 else if ( format == 0x00020000L ||
445 format == 0x00025000L )
446 {
447 TT_Post_Names names = &face->postscript_names;
448
449
450 if ( !names->loaded )
451 {
452 error = load_post_names( face );
453 if ( error )
454 goto End;
455 }
456
457 if ( idx < (FT_UInt)names->num_glyphs )
458 {
459 FT_UShort name_index = names->glyph_indices[idx];
460
461
462 if ( name_index < 258 )
463 *PSname = MAC_NAME( name_index );
464 else /* only for version 2.0 */
465 *PSname = (FT_String*)names->glyph_names[name_index - 258];
466 }
467 }
468
469 /* nothing to do for format == 0x00030000L */
470
471 End:
472 /* post format errors ignored */
473 return FT_Err_Ok;
474 }
475
476 #else /* !TT_CONFIG_OPTION_POSTSCRIPT_NAMES */
477
478 /* ANSI C doesn't like empty source files */
479 typedef int tt_post_dummy_;
480
481 #endif /* !TT_CONFIG_OPTION_POSTSCRIPT_NAMES */
482
483
484 /* END */