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ttload.c

Last change on this file was 2, checked in by jglee, 11 years ago
first commit
File size: 46.1 KB

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1	/***************************************************************************/
2	/* */
3	/* ttload.c */
4	/* */
5	/* Load the basic TrueType tables, i.e., tables that can be either in */
6	/* TTF or OTF fonts (body). */
7	/* */
8	/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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	#include <ft2build.h>
21	#include FT_INTERNAL_DEBUG_H
22	#include FT_INTERNAL_STREAM_H
23	#include FT_TRUETYPE_TAGS_H
24	#include "ttload.h"
25
26	#include "sferrors.h"
27
28
29	/*************************************************************************/
30	/* */
31	/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
32	/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
33	/* messages during execution. */
34	/* */
35	#undef FT_COMPONENT
36	#define FT_COMPONENT trace_ttload
37
38
39	/*************************************************************************/
40	/* */
41	/* <Function> */
42	/* tt_face_lookup_table */
43	/* */
44	/* <Description> */
45	/* Looks for a TrueType table by name. */
46	/* */
47	/* <Input> */
48	/* face :: A face object handle. */
49	/* */
50	/* tag :: The searched tag. */
51	/* */
52	/* <Return> */
53	/* A pointer to the table directory entry. 0 if not found. */
54	/* */
55	FT_LOCAL_DEF( TT_Table )
56	tt_face_lookup_table( TT_Face face,
57	FT_ULong tag )
58	{
59	TT_Table entry;
60	TT_Table limit;
61	#ifdef FT_DEBUG_LEVEL_TRACE
62	FT_Bool zero_length = FALSE;
63	#endif
64
65
66	FT_TRACE4(( "tt_face_lookup_table: %08p, `%c%c%c%c' -- ",
67	face,
68	(FT_Char)( tag >> 24 ),
69	(FT_Char)( tag >> 16 ),
70	(FT_Char)( tag >> 8 ),
71	(FT_Char)( tag ) ));
72
73	entry = face->dir_tables;
74	limit = entry + face->num_tables;
75
76	for ( ; entry < limit; entry++ )
77	{
78	/* For compatibility with Windows, we consider */
79	/* zero-length tables the same as missing tables. */
80	if ( entry->Tag == tag ) {
81	if ( entry->Length != 0 )
82	{
83	FT_TRACE4(( "found table.\n" ));
84	return entry;
85	}
86	#ifdef FT_DEBUG_LEVEL_TRACE
87	zero_length = TRUE;
88	#endif
89	}
90	}
91
92	#ifdef FT_DEBUG_LEVEL_TRACE
93	if ( zero_length )
94	FT_TRACE4(( "ignoring empty table!\n" ));
95	else
96	FT_TRACE4(( "could not find table!\n" ));
97	#endif
98
99	return NULL;
100	}
101
102
103	/*************************************************************************/
104	/* */
105	/* <Function> */
106	/* tt_face_goto_table */
107	/* */
108	/* <Description> */
109	/* Looks for a TrueType table by name, then seek a stream to it. */
110	/* */
111	/* <Input> */
112	/* face :: A face object handle. */
113	/* */
114	/* tag :: The searched tag. */
115	/* */
116	/* stream :: The stream to seek when the table is found. */
117	/* */
118	/* <Output> */
119	/* length :: The length of the table if found, undefined otherwise. */
120	/* */
121	/* <Return> */
122	/* FreeType error code. 0 means success. */
123	/* */
124	FT_LOCAL_DEF( FT_Error )
125	tt_face_goto_table( TT_Face face,
126	FT_ULong tag,
127	FT_Stream stream,
128	FT_ULong* length )
129	{
130	TT_Table table;
131	FT_Error error;
132
133
134	table = tt_face_lookup_table( face, tag );
135	if ( table )
136	{
137	if ( length )
138	*length = table->Length;
139
140	if ( FT_STREAM_SEEK( table->Offset ) )
141	goto Exit;
142	}
143	else
144	error = SFNT_Err_Table_Missing;
145
146	Exit:
147	return error;
148	}
149
150
151	/* Here, we */
152	/* */
153	/* - check that `num_tables' is valid (and adjust it if necessary) */
154	/* */
155	/* - look for a `head' table, check its size, and parse it to check */
156	/* whether its `magic' field is correctly set */
157	/* */
158	/* - errors (except errors returned by stream handling) */
159	/* */
160	/* SFNT_Err_Unknown_File_Format: */
161	/* no table is defined in directory, it is not sfnt-wrapped */
162	/* data */
163	/* SFNT_Err_Table_Missing: */
164	/* table directory is valid, but essential tables */
165	/* (head/bhed/SING) are missing */
166	/* */
167	static FT_Error
168	check_table_dir( SFNT_Header sfnt,
169	FT_Stream stream )
170	{
171	FT_Error error;
172	FT_UInt nn, valid_entries = 0;
173	FT_UInt has_head = 0, has_sing = 0, has_meta = 0;
174	FT_ULong offset = sfnt->offset + 12;
175
176	static const FT_Frame_Field table_dir_entry_fields[] =
177	{
178	#undef FT_STRUCTURE
179	#define FT_STRUCTURE TT_TableRec
180
181	FT_FRAME_START( 16 ),
182	FT_FRAME_ULONG( Tag ),
183	FT_FRAME_ULONG( CheckSum ),
184	FT_FRAME_ULONG( Offset ),
185	FT_FRAME_ULONG( Length ),
186	FT_FRAME_END
187	};
188
189
190	if ( FT_STREAM_SEEK( offset ) )
191	goto Exit;
192
193	for ( nn = 0; nn < sfnt->num_tables; nn++ )
194	{
195	TT_TableRec table;
196
197
198	if ( FT_STREAM_READ_FIELDS( table_dir_entry_fields, &table ) )
199	{
200	nn--;
201	FT_TRACE2(( "check_table_dir:"
202	" can read only %d table%s in font (instead of %d)\n",
203	nn, nn == 1 ? "" : "s", sfnt->num_tables ));
204	sfnt->num_tables = nn;
205	break;
206	}
207
208	/* we ignore invalid tables */
209	if ( table.Offset + table.Length > stream->size )
210	{
211	FT_TRACE2(( "check_table_dir: table entry %d invalid\n", nn ));
212	continue;
213	}
214	else
215	valid_entries++;
216
217	if ( table.Tag == TTAG_head \|\| table.Tag == TTAG_bhed )
218	{
219	FT_UInt32 magic;
220
221
222	#ifndef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
223	if ( table.Tag == TTAG_head )
224	#endif
225	has_head = 1;
226
227	/*
228	* The table length should be 0x36, but certain font tools make it
229	* 0x38, so we will just check that it is greater.
230	*
231	* Note that according to the specification, the table must be
232	* padded to 32-bit lengths, but this doesn't apply to the value of
233	* its `Length' field!
234	*
235	*/
236	if ( table.Length < 0x36 )
237	{
238	FT_TRACE2(( "check_table_dir: `head' table too small\n" ));
239	error = SFNT_Err_Table_Missing;
240	goto Exit;
241	}
242
243	if ( FT_STREAM_SEEK( table.Offset + 12 ) \|\|
244	FT_READ_ULONG( magic ) )
245	goto Exit;
246
247	if ( magic != 0x5F0F3CF5UL )
248	{
249	FT_TRACE2(( "check_table_dir:"
250	" no magic number found in `head' table\n"));
251	error = SFNT_Err_Table_Missing;
252	goto Exit;
253	}
254
255	if ( FT_STREAM_SEEK( offset + ( nn + 1 ) * 16 ) )
256	goto Exit;
257	}
258	else if ( table.Tag == TTAG_SING )
259	has_sing = 1;
260	else if ( table.Tag == TTAG_META )
261	has_meta = 1;
262	}
263
264	sfnt->num_tables = valid_entries;
265
266	if ( sfnt->num_tables == 0 )
267	{
268	FT_TRACE2(( "check_table_dir: no tables found\n" ));
269	error = SFNT_Err_Unknown_File_Format;
270	goto Exit;
271	}
272
273	/* if `sing' and `meta' tables are present, there is no `head' table */
274	if ( has_head \|\| ( has_sing && has_meta ) )
275	{
276	error = SFNT_Err_Ok;
277	goto Exit;
278	}
279	else
280	{
281	FT_TRACE2(( "check_table_dir:" ));
282	#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
283	FT_TRACE2(( " neither `head', `bhed', nor `sing' table found\n" ));
284	#else
285	FT_TRACE2(( " neither `head' nor `sing' table found\n" ));
286	#endif
287	error = SFNT_Err_Table_Missing;
288	}
289
290	Exit:
291	return error;
292	}
293
294
295	/*************************************************************************/
296	/* */
297	/* <Function> */
298	/* tt_face_load_font_dir */
299	/* */
300	/* <Description> */
301	/* Loads the header of a SFNT font file. */
302	/* */
303	/* <Input> */
304	/* face :: A handle to the target face object. */
305	/* */
306	/* stream :: The input stream. */
307	/* */
308	/* <Output> */
309	/* sfnt :: The SFNT header. */
310	/* */
311	/* <Return> */
312	/* FreeType error code. 0 means success. */
313	/* */
314	/* <Note> */
315	/* The stream cursor must be at the beginning of the font directory. */
316	/* */
317	FT_LOCAL_DEF( FT_Error )
318	tt_face_load_font_dir( TT_Face face,
319	FT_Stream stream )
320	{
321	SFNT_HeaderRec sfnt;
322	FT_Error error;
323	FT_Memory memory = stream->memory;
324	TT_TableRec* entry;
325	FT_Int nn;
326
327	static const FT_Frame_Field offset_table_fields[] =
328	{
329	#undef FT_STRUCTURE
330	#define FT_STRUCTURE SFNT_HeaderRec
331
332	FT_FRAME_START( 8 ),
333	FT_FRAME_USHORT( num_tables ),
334	FT_FRAME_USHORT( search_range ),
335	FT_FRAME_USHORT( entry_selector ),
336	FT_FRAME_USHORT( range_shift ),
337	FT_FRAME_END
338	};
339
340
341	FT_TRACE2(( "tt_face_load_font_dir: %08p\n", face ));
342
343	/* read the offset table */
344
345	sfnt.offset = FT_STREAM_POS();
346
347	if ( FT_READ_ULONG( sfnt.format_tag ) \|\|
348	FT_STREAM_READ_FIELDS( offset_table_fields, &sfnt ) )
349	goto Exit;
350
351	/* many fonts don't have these fields set correctly */
352	#if 0
353	if ( sfnt.search_range != 1 << ( sfnt.entry_selector + 4 ) \|\|
354	sfnt.search_range + sfnt.range_shift != sfnt.num_tables << 4 )
355	return SFNT_Err_Unknown_File_Format;
356	#endif
357
358	/* load the table directory */
359
360	FT_TRACE2(( "-- Number of tables: %10u\n", sfnt.num_tables ));
361	FT_TRACE2(( "-- Format version: 0x%08lx\n", sfnt.format_tag ));
362
363	/* check first */
364	error = check_table_dir( &sfnt, stream );
365	if ( error )
366	{
367	FT_TRACE2(( "tt_face_load_font_dir: invalid table directory for TrueType!\n" ));
368
369	goto Exit;
370	}
371
372	face->num_tables = sfnt.num_tables;
373	face->format_tag = sfnt.format_tag;
374
375	if ( FT_QNEW_ARRAY( face->dir_tables, face->num_tables ) )
376	goto Exit;
377
378	if ( FT_STREAM_SEEK( sfnt.offset + 12 ) \|\|
379	FT_FRAME_ENTER( face->num_tables * 16L ) )
380	goto Exit;
381
382	entry = face->dir_tables;
383
384	for ( nn = 0; nn < sfnt.num_tables; nn++ )
385	{
386	entry->Tag = FT_GET_TAG4();
387	entry->CheckSum = FT_GET_ULONG();
388	entry->Offset = FT_GET_LONG();
389	entry->Length = FT_GET_LONG();
390
391	/* ignore invalid tables */
392	if ( entry->Offset + entry->Length > stream->size )
393	continue;
394	else
395	{
396	FT_TRACE2(( " %c%c%c%c - %08lx - %08lx\n",
397	(FT_Char)( entry->Tag >> 24 ),
398	(FT_Char)( entry->Tag >> 16 ),
399	(FT_Char)( entry->Tag >> 8 ),
400	(FT_Char)( entry->Tag ),
401	entry->Offset,
402	entry->Length ));
403	entry++;
404	}
405	}
406
407	FT_FRAME_EXIT();
408
409	FT_TRACE2(( "table directory loaded\n\n" ));
410
411	Exit:
412	return error;
413	}
414
415
416	/*************************************************************************/
417	/* */
418	/* <Function> */
419	/* tt_face_load_any */
420	/* */
421	/* <Description> */
422	/* Loads any font table into client memory. */
423	/* */
424	/* <Input> */
425	/* face :: The face object to look for. */
426	/* */
427	/* tag :: The tag of table to load. Use the value 0 if you want */
428	/* to access the whole font file, else set this parameter */
429	/* to a valid TrueType table tag that you can forge with */
430	/* the MAKE_TT_TAG macro. */
431	/* */
432	/* offset :: The starting offset in the table (or the file if */
433	/* tag == 0). */
434	/* */
435	/* length :: The address of the decision variable: */
436	/* */
437	/* If length == NULL: */
438	/* Loads the whole table. Returns an error if */
439	/* `offset' == 0! */
440	/* */
441	/* If length == 0: /
442	/* Exits immediately; returning the length of the given */
443	/* table or of the font file, depending on the value of */
444	/* `tag'. */
445	/* */
446	/* If length != 0: /
447	/* Loads the next `length' bytes of table or font, */
448	/* starting at offset `offset' (in table or font too). */
449	/* */
450	/* <Output> */
451	/* buffer :: The address of target buffer. */
452	/* */
453	/* <Return> */
454	/* FreeType error code. 0 means success. */
455	/* */
456	FT_LOCAL_DEF( FT_Error )
457	tt_face_load_any( TT_Face face,
458	FT_ULong tag,
459	FT_Long offset,
460	FT_Byte* buffer,
461	FT_ULong* length )
462	{
463	FT_Error error;
464	FT_Stream stream;
465	TT_Table table;
466	FT_ULong size;
467
468
469	if ( tag != 0 )
470	{
471	/* look for tag in font directory */
472	table = tt_face_lookup_table( face, tag );
473	if ( !table )
474	{
475	error = SFNT_Err_Table_Missing;
476	goto Exit;
477	}
478
479	offset += table->Offset;
480	size = table->Length;
481	}
482	else
483	/* tag == 0 -- the user wants to access the font file directly */
484	size = face->root.stream->size;
485
486	if ( length && *length == 0 )
487	{
488	*length = size;
489
490	return SFNT_Err_Ok;
491	}
492
493	if ( length )
494	size = *length;
495
496	stream = face->root.stream;
497	/* the `if' is syntactic sugar for picky compilers */
498	if ( FT_STREAM_READ_AT( offset, buffer, size ) )
499	goto Exit;
500
501	Exit:
502	return error;
503	}
504
505
506	/*************************************************************************/
507	/* */
508	/* <Function> */
509	/* tt_face_load_generic_header */
510	/* */
511	/* <Description> */
512	/* Loads the TrueType table `head' or `bhed'. */
513	/* */
514	/* <Input> */
515	/* face :: A handle to the target face object. */
516	/* */
517	/* stream :: The input stream. */
518	/* */
519	/* <Return> */
520	/* FreeType error code. 0 means success. */
521	/* */
522	static FT_Error
523	tt_face_load_generic_header( TT_Face face,
524	FT_Stream stream,
525	FT_ULong tag )
526	{
527	FT_Error error;
528	TT_Header* header;
529
530	static const FT_Frame_Field header_fields[] =
531	{
532	#undef FT_STRUCTURE
533	#define FT_STRUCTURE TT_Header
534
535	FT_FRAME_START( 54 ),
536	FT_FRAME_ULONG ( Table_Version ),
537	FT_FRAME_ULONG ( Font_Revision ),
538	FT_FRAME_LONG ( CheckSum_Adjust ),
539	FT_FRAME_LONG ( Magic_Number ),
540	FT_FRAME_USHORT( Flags ),
541	FT_FRAME_USHORT( Units_Per_EM ),
542	FT_FRAME_LONG ( Created[0] ),
543	FT_FRAME_LONG ( Created[1] ),
544	FT_FRAME_LONG ( Modified[0] ),
545	FT_FRAME_LONG ( Modified[1] ),
546	FT_FRAME_SHORT ( xMin ),
547	FT_FRAME_SHORT ( yMin ),
548	FT_FRAME_SHORT ( xMax ),
549	FT_FRAME_SHORT ( yMax ),
550	FT_FRAME_USHORT( Mac_Style ),
551	FT_FRAME_USHORT( Lowest_Rec_PPEM ),
552	FT_FRAME_SHORT ( Font_Direction ),
553	FT_FRAME_SHORT ( Index_To_Loc_Format ),
554	FT_FRAME_SHORT ( Glyph_Data_Format ),
555	FT_FRAME_END
556	};
557
558
559	error = face->goto_table( face, tag, stream, 0 );
560	if ( error )
561	goto Exit;
562
563	header = &face->header;
564
565	if ( FT_STREAM_READ_FIELDS( header_fields, header ) )
566	goto Exit;
567
568	FT_TRACE3(( "Units per EM: %4u\n", header->Units_Per_EM ));
569	FT_TRACE3(( "IndexToLoc: %4d\n", header->Index_To_Loc_Format ));
570
571	Exit:
572	return error;
573	}
574
575
576	FT_LOCAL_DEF( FT_Error )
577	tt_face_load_head( TT_Face face,
578	FT_Stream stream )
579	{
580	return tt_face_load_generic_header( face, stream, TTAG_head );
581	}
582
583
584	#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
585
586	FT_LOCAL_DEF( FT_Error )
587	tt_face_load_bhed( TT_Face face,
588	FT_Stream stream )
589	{
590	return tt_face_load_generic_header( face, stream, TTAG_bhed );
591	}
592
593	#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
594
595
596	/*************************************************************************/
597	/* */
598	/* <Function> */
599	/* tt_face_load_max_profile */
600	/* */
601	/* <Description> */
602	/* Loads the maximum profile into a face object. */
603	/* */
604	/* <Input> */
605	/* face :: A handle to the target face object. */
606	/* */
607	/* stream :: The input stream. */
608	/* */
609	/* <Return> */
610	/* FreeType error code. 0 means success. */
611	/* */
612	FT_LOCAL_DEF( FT_Error )
613	tt_face_load_maxp( TT_Face face,
614	FT_Stream stream )
615	{
616	FT_Error error;
617	TT_MaxProfile* maxProfile = &face->max_profile;
618
619	const FT_Frame_Field maxp_fields[] =
620	{
621	#undef FT_STRUCTURE
622	#define FT_STRUCTURE TT_MaxProfile
623
624	FT_FRAME_START( 6 ),
625	FT_FRAME_LONG ( version ),
626	FT_FRAME_USHORT( numGlyphs ),
627	FT_FRAME_END
628	};
629
630	const FT_Frame_Field maxp_fields_extra[] =
631	{
632	FT_FRAME_START( 26 ),
633	FT_FRAME_USHORT( maxPoints ),
634	FT_FRAME_USHORT( maxContours ),
635	FT_FRAME_USHORT( maxCompositePoints ),
636	FT_FRAME_USHORT( maxCompositeContours ),
637	FT_FRAME_USHORT( maxZones ),
638	FT_FRAME_USHORT( maxTwilightPoints ),
639	FT_FRAME_USHORT( maxStorage ),
640	FT_FRAME_USHORT( maxFunctionDefs ),
641	FT_FRAME_USHORT( maxInstructionDefs ),
642	FT_FRAME_USHORT( maxStackElements ),
643	FT_FRAME_USHORT( maxSizeOfInstructions ),
644	FT_FRAME_USHORT( maxComponentElements ),
645	FT_FRAME_USHORT( maxComponentDepth ),
646	FT_FRAME_END
647	};
648
649
650	error = face->goto_table( face, TTAG_maxp, stream, 0 );
651	if ( error )
652	goto Exit;
653
654	if ( FT_STREAM_READ_FIELDS( maxp_fields, maxProfile ) )
655	goto Exit;
656
657	maxProfile->maxPoints = 0;
658	maxProfile->maxContours = 0;
659	maxProfile->maxCompositePoints = 0;
660	maxProfile->maxCompositeContours = 0;
661	maxProfile->maxZones = 0;
662	maxProfile->maxTwilightPoints = 0;
663	maxProfile->maxStorage = 0;
664	maxProfile->maxFunctionDefs = 0;
665	maxProfile->maxInstructionDefs = 0;
666	maxProfile->maxStackElements = 0;
667	maxProfile->maxSizeOfInstructions = 0;
668	maxProfile->maxComponentElements = 0;
669	maxProfile->maxComponentDepth = 0;
670
671	if ( maxProfile->version >= 0x10000L )
672	{
673	if ( FT_STREAM_READ_FIELDS( maxp_fields_extra, maxProfile ) )
674	goto Exit;
675
676	/* XXX: an adjustment that is necessary to load certain */
677	/* broken fonts like `Keystrokes MT' :-( */
678	/* */
679	/* We allocate 64 function entries by default when */
680	/* the maxFunctionDefs field is null. */
681
682	if ( maxProfile->maxFunctionDefs == 0 )
683	maxProfile->maxFunctionDefs = 64;
684
685	/* we add 4 phantom points later */
686	if ( maxProfile->maxTwilightPoints > ( 0xFFFFU - 4 ) )
687	{
688	FT_ERROR(( "Too much twilight points in `maxp' table;\n" ));
689	FT_ERROR(( " some glyphs might be rendered incorrectly.\n" ));
690
691	maxProfile->maxTwilightPoints = 0xFFFFU - 4;
692	}
693	}
694
695	FT_TRACE3(( "numGlyphs: %u\n", maxProfile->numGlyphs ));
696
697	Exit:
698	return error;
699	}
700
701
702	/*************************************************************************/
703	/* */
704	/* <Function> */
705	/* tt_face_load_names */
706	/* */
707	/* <Description> */
708	/* Loads the name records. */
709	/* */
710	/* <Input> */
711	/* face :: A handle to the target face object. */
712	/* */
713	/* stream :: The input stream. */
714	/* */
715	/* <Return> */
716	/* FreeType error code. 0 means success. */
717	/* */
718	FT_LOCAL_DEF( FT_Error )
719	tt_face_load_name( TT_Face face,
720	FT_Stream stream )
721	{
722	FT_Error error;
723	FT_Memory memory = stream->memory;
724	FT_ULong table_pos, table_len;
725	FT_ULong storage_start, storage_limit;
726	FT_UInt count;
727	TT_NameTable table;
728
729	static const FT_Frame_Field name_table_fields[] =
730	{
731	#undef FT_STRUCTURE
732	#define FT_STRUCTURE TT_NameTableRec
733
734	FT_FRAME_START( 6 ),
735	FT_FRAME_USHORT( format ),
736	FT_FRAME_USHORT( numNameRecords ),
737	FT_FRAME_USHORT( storageOffset ),
738	FT_FRAME_END
739	};
740
741	static const FT_Frame_Field name_record_fields[] =
742	{
743	#undef FT_STRUCTURE
744	#define FT_STRUCTURE TT_NameEntryRec
745
746	/* no FT_FRAME_START */
747	FT_FRAME_USHORT( platformID ),
748	FT_FRAME_USHORT( encodingID ),
749	FT_FRAME_USHORT( languageID ),
750	FT_FRAME_USHORT( nameID ),
751	FT_FRAME_USHORT( stringLength ),
752	FT_FRAME_USHORT( stringOffset ),
753	FT_FRAME_END
754	};
755
756
757	table = &face->name_table;
758	table->stream = stream;
759
760	error = face->goto_table( face, TTAG_name, stream, &table_len );
761	if ( error )
762	goto Exit;
763
764	table_pos = FT_STREAM_POS();
765
766
767	if ( FT_STREAM_READ_FIELDS( name_table_fields, table ) )
768	goto Exit;
769
770	/* Some popular Asian fonts have an invalid `storageOffset' value */
771	/* (it should be at least "6 + 12num_names"). However, the string /
772	/* offsets, computed as "storageOffset + entry->stringOffset", are */
773	/* valid pointers within the name table... */
774	/* */
775	/* We thus can't check `storageOffset' right now. */
776	/* */
777	storage_start = table_pos + 6 + 12*table->numNameRecords;
778	storage_limit = table_pos + table_len;
779
780	if ( storage_start > storage_limit )
781	{
782	FT_ERROR(( "invalid `name' table\n" ));
783	error = SFNT_Err_Name_Table_Missing;
784	goto Exit;
785	}
786
787	/* Allocate the array of name records. */
788	count = table->numNameRecords;
789	table->numNameRecords = 0;
790
791	if ( FT_NEW_ARRAY( table->names, count ) \|\|
792	FT_FRAME_ENTER( count * 12 ) )
793	goto Exit;
794
795	/* Load the name records and determine how much storage is needed */
796	/* to hold the strings themselves. */
797	{
798	TT_NameEntryRec* entry = table->names;
799
800
801	for ( ; count > 0; count-- )
802	{
803	if ( FT_STREAM_READ_FIELDS( name_record_fields, entry ) )
804	continue;
805
806	/* check that the name is not empty */
807	if ( entry->stringLength == 0 )
808	continue;
809
810	/* check that the name string is within the table */
811	entry->stringOffset += table_pos + table->storageOffset;
812	if ( entry->stringOffset < storage_start \|\|
813	entry->stringOffset + entry->stringLength > storage_limit )
814	{
815	/* invalid entry - ignore it */
816	entry->stringOffset = 0;
817	entry->stringLength = 0;
818	continue;
819	}
820
821	entry++;
822	}
823
824	table->numNameRecords = (FT_UInt)( entry - table->names );
825	}
826
827	FT_FRAME_EXIT();
828
829	/* everything went well, update face->num_names */
830	face->num_names = (FT_UShort) table->numNameRecords;
831
832	Exit:
833	return error;
834	}
835
836
837	/*************************************************************************/
838	/* */
839	/* <Function> */
840	/* tt_face_free_names */
841	/* */
842	/* <Description> */
843	/* Frees the name records. */
844	/* */
845	/* <Input> */
846	/* face :: A handle to the target face object. */
847	/* */
848	FT_LOCAL_DEF( void )
849	tt_face_free_name( TT_Face face )
850	{
851	FT_Memory memory = face->root.driver->root.memory;
852	TT_NameTable table = &face->name_table;
853	TT_NameEntry entry = table->names;
854	FT_UInt count = table->numNameRecords;
855
856
857	if ( table->names )
858	{
859	for ( ; count > 0; count--, entry++ )
860	{
861	FT_FREE( entry->string );
862	entry->stringLength = 0;
863	}
864
865	/* free strings table */
866	FT_FREE( table->names );
867	}
868
869	table->numNameRecords = 0;
870	table->format = 0;
871	table->storageOffset = 0;
872	}
873
874
875	/*************************************************************************/
876	/* */
877	/* <Function> */
878	/* tt_face_load_cmap */
879	/* */
880	/* <Description> */
881	/* Loads the cmap directory in a face object. The cmaps themselves */
882	/* are loaded on demand in the `ttcmap.c' module. */
883	/* */
884	/* <Input> */
885	/* face :: A handle to the target face object. */
886	/* */
887	/* stream :: A handle to the input stream. */
888	/* */
889	/* <Return> */
890	/* FreeType error code. 0 means success. */
891	/* */
892
893	FT_LOCAL_DEF( FT_Error )
894	tt_face_load_cmap( TT_Face face,
895	FT_Stream stream )
896	{
897	FT_Error error;
898
899
900	error = face->goto_table( face, TTAG_cmap, stream, &face->cmap_size );
901	if ( error )
902	goto Exit;
903
904	if ( FT_FRAME_EXTRACT( face->cmap_size, face->cmap_table ) )
905	face->cmap_size = 0;
906
907	Exit:
908	return error;
909	}
910
911
912
913	/*************************************************************************/
914	/* */
915	/* <Function> */
916	/* tt_face_load_os2 */
917	/* */
918	/* <Description> */
919	/* Loads the OS2 table. */
920	/* */
921	/* <Input> */
922	/* face :: A handle to the target face object. */
923	/* */
924	/* stream :: A handle to the input stream. */
925	/* */
926	/* <Return> */
927	/* FreeType error code. 0 means success. */
928	/* */
929	FT_LOCAL_DEF( FT_Error )
930	tt_face_load_os2( TT_Face face,
931	FT_Stream stream )
932	{
933	FT_Error error;
934	TT_OS2* os2;
935
936	const FT_Frame_Field os2_fields[] =
937	{
938	#undef FT_STRUCTURE
939	#define FT_STRUCTURE TT_OS2
940
941	FT_FRAME_START( 78 ),
942	FT_FRAME_USHORT( version ),
943	FT_FRAME_SHORT ( xAvgCharWidth ),
944	FT_FRAME_USHORT( usWeightClass ),
945	FT_FRAME_USHORT( usWidthClass ),
946	FT_FRAME_SHORT ( fsType ),
947	FT_FRAME_SHORT ( ySubscriptXSize ),
948	FT_FRAME_SHORT ( ySubscriptYSize ),
949	FT_FRAME_SHORT ( ySubscriptXOffset ),
950	FT_FRAME_SHORT ( ySubscriptYOffset ),
951	FT_FRAME_SHORT ( ySuperscriptXSize ),
952	FT_FRAME_SHORT ( ySuperscriptYSize ),
953	FT_FRAME_SHORT ( ySuperscriptXOffset ),
954	FT_FRAME_SHORT ( ySuperscriptYOffset ),
955	FT_FRAME_SHORT ( yStrikeoutSize ),
956	FT_FRAME_SHORT ( yStrikeoutPosition ),
957	FT_FRAME_SHORT ( sFamilyClass ),
958	FT_FRAME_BYTE ( panose[0] ),
959	FT_FRAME_BYTE ( panose[1] ),
960	FT_FRAME_BYTE ( panose[2] ),
961	FT_FRAME_BYTE ( panose[3] ),
962	FT_FRAME_BYTE ( panose[4] ),
963	FT_FRAME_BYTE ( panose[5] ),
964	FT_FRAME_BYTE ( panose[6] ),
965	FT_FRAME_BYTE ( panose[7] ),
966	FT_FRAME_BYTE ( panose[8] ),
967	FT_FRAME_BYTE ( panose[9] ),
968	FT_FRAME_ULONG ( ulUnicodeRange1 ),
969	FT_FRAME_ULONG ( ulUnicodeRange2 ),
970	FT_FRAME_ULONG ( ulUnicodeRange3 ),
971	FT_FRAME_ULONG ( ulUnicodeRange4 ),
972	FT_FRAME_BYTE ( achVendID[0] ),
973	FT_FRAME_BYTE ( achVendID[1] ),
974	FT_FRAME_BYTE ( achVendID[2] ),
975	FT_FRAME_BYTE ( achVendID[3] ),
976
977	FT_FRAME_USHORT( fsSelection ),
978	FT_FRAME_USHORT( usFirstCharIndex ),
979	FT_FRAME_USHORT( usLastCharIndex ),
980	FT_FRAME_SHORT ( sTypoAscender ),
981	FT_FRAME_SHORT ( sTypoDescender ),
982	FT_FRAME_SHORT ( sTypoLineGap ),
983	FT_FRAME_USHORT( usWinAscent ),
984	FT_FRAME_USHORT( usWinDescent ),
985	FT_FRAME_END
986	};
987
988	const FT_Frame_Field os2_fields_extra[] =
989	{
990	FT_FRAME_START( 8 ),
991	FT_FRAME_ULONG( ulCodePageRange1 ),
992	FT_FRAME_ULONG( ulCodePageRange2 ),
993	FT_FRAME_END
994	};
995
996	const FT_Frame_Field os2_fields_extra2[] =
997	{
998	FT_FRAME_START( 10 ),
999	FT_FRAME_SHORT ( sxHeight ),
1000	FT_FRAME_SHORT ( sCapHeight ),
1001	FT_FRAME_USHORT( usDefaultChar ),
1002	FT_FRAME_USHORT( usBreakChar ),
1003	FT_FRAME_USHORT( usMaxContext ),
1004	FT_FRAME_END
1005	};
1006
1007
1008	/* We now support old Mac fonts where the OS/2 table doesn't */
1009	/* exist. Simply put, we set the `version' field to 0xFFFF */
1010	/* and test this value each time we need to access the table. */
1011	error = face->goto_table( face, TTAG_OS2, stream, 0 );
1012	if ( error )
1013	goto Exit;
1014
1015	os2 = &face->os2;
1016
1017	if ( FT_STREAM_READ_FIELDS( os2_fields, os2 ) )
1018	goto Exit;
1019
1020	os2->ulCodePageRange1 = 0;
1021	os2->ulCodePageRange2 = 0;
1022	os2->sxHeight = 0;
1023	os2->sCapHeight = 0;
1024	os2->usDefaultChar = 0;
1025	os2->usBreakChar = 0;
1026	os2->usMaxContext = 0;
1027
1028	if ( os2->version >= 0x0001 )
1029	{
1030	/* only version 1 tables */
1031	if ( FT_STREAM_READ_FIELDS( os2_fields_extra, os2 ) )
1032	goto Exit;
1033
1034	if ( os2->version >= 0x0002 )
1035	{
1036	/* only version 2 tables */
1037	if ( FT_STREAM_READ_FIELDS( os2_fields_extra2, os2 ) )
1038	goto Exit;
1039	}
1040	}
1041
1042	FT_TRACE3(( "sTypoAscender: %4d\n", os2->sTypoAscender ));
1043	FT_TRACE3(( "sTypoDescender: %4d\n", os2->sTypoDescender ));
1044	FT_TRACE3(( "usWinAscent: %4u\n", os2->usWinAscent ));
1045	FT_TRACE3(( "usWinDescent: %4u\n", os2->usWinDescent ));
1046	FT_TRACE3(( "fsSelection: 0x%2x\n", os2->fsSelection ));
1047
1048	Exit:
1049	return error;
1050	}
1051
1052
1053	/*************************************************************************/
1054	/* */
1055	/* <Function> */
1056	/* tt_face_load_postscript */
1057	/* */
1058	/* <Description> */
1059	/* Loads the Postscript table. */
1060	/* */
1061	/* <Input> */
1062	/* face :: A handle to the target face object. */
1063	/* */
1064	/* stream :: A handle to the input stream. */
1065	/* */
1066	/* <Return> */
1067	/* FreeType error code. 0 means success. */
1068	/* */
1069	FT_LOCAL_DEF( FT_Error )
1070	tt_face_load_post( TT_Face face,
1071	FT_Stream stream )
1072	{
1073	FT_Error error;
1074	TT_Postscript* post = &face->postscript;
1075
1076	static const FT_Frame_Field post_fields[] =
1077	{
1078	#undef FT_STRUCTURE
1079	#define FT_STRUCTURE TT_Postscript
1080
1081	FT_FRAME_START( 32 ),
1082	FT_FRAME_ULONG( FormatType ),
1083	FT_FRAME_ULONG( italicAngle ),
1084	FT_FRAME_SHORT( underlinePosition ),
1085	FT_FRAME_SHORT( underlineThickness ),
1086	FT_FRAME_ULONG( isFixedPitch ),
1087	FT_FRAME_ULONG( minMemType42 ),
1088	FT_FRAME_ULONG( maxMemType42 ),
1089	FT_FRAME_ULONG( minMemType1 ),
1090	FT_FRAME_ULONG( maxMemType1 ),
1091	FT_FRAME_END
1092	};
1093
1094
1095	error = face->goto_table( face, TTAG_post, stream, 0 );
1096	if ( error )
1097	return error;
1098
1099	if ( FT_STREAM_READ_FIELDS( post_fields, post ) )
1100	return error;
1101
1102	/* we don't load the glyph names, we do that in another */
1103	/* module (ttpost). */
1104
1105	FT_TRACE3(( "FormatType: 0x%x\n", post->FormatType ));
1106	FT_TRACE3(( "isFixedPitch: %s\n", post->isFixedPitch
1107	? " yes" : " no" ));
1108
1109	return SFNT_Err_Ok;
1110	}
1111
1112
1113	/*************************************************************************/
1114	/* */
1115	/* <Function> */
1116	/* tt_face_load_pclt */
1117	/* */
1118	/* <Description> */
1119	/* Loads the PCL 5 Table. */
1120	/* */
1121	/* <Input> */
1122	/* face :: A handle to the target face object. */
1123	/* */
1124	/* stream :: A handle to the input stream. */
1125	/* */
1126	/* <Return> */
1127	/* FreeType error code. 0 means success. */
1128	/* */
1129	FT_LOCAL_DEF( FT_Error )
1130	tt_face_load_pclt( TT_Face face,
1131	FT_Stream stream )
1132	{
1133	static const FT_Frame_Field pclt_fields[] =
1134	{
1135	#undef FT_STRUCTURE
1136	#define FT_STRUCTURE TT_PCLT
1137
1138	FT_FRAME_START( 54 ),
1139	FT_FRAME_ULONG ( Version ),
1140	FT_FRAME_ULONG ( FontNumber ),
1141	FT_FRAME_USHORT( Pitch ),
1142	FT_FRAME_USHORT( xHeight ),
1143	FT_FRAME_USHORT( Style ),
1144	FT_FRAME_USHORT( TypeFamily ),
1145	FT_FRAME_USHORT( CapHeight ),
1146	FT_FRAME_BYTES ( TypeFace, 16 ),
1147	FT_FRAME_BYTES ( CharacterComplement, 8 ),
1148	FT_FRAME_BYTES ( FileName, 6 ),
1149	FT_FRAME_CHAR ( StrokeWeight ),
1150	FT_FRAME_CHAR ( WidthType ),
1151	FT_FRAME_BYTE ( SerifStyle ),
1152	FT_FRAME_BYTE ( Reserved ),
1153	FT_FRAME_END
1154	};
1155
1156	FT_Error error;
1157	TT_PCLT* pclt = &face->pclt;
1158
1159
1160	/* optional table */
1161	error = face->goto_table( face, TTAG_PCLT, stream, 0 );
1162	if ( error )
1163	goto Exit;
1164
1165	if ( FT_STREAM_READ_FIELDS( pclt_fields, pclt ) )
1166	goto Exit;
1167
1168	Exit:
1169	return error;
1170	}
1171
1172
1173	/*************************************************************************/
1174	/* */
1175	/* <Function> */
1176	/* tt_face_load_gasp */
1177	/* */
1178	/* <Description> */
1179	/* Loads the `gasp' table into a face object. */
1180	/* */
1181	/* <Input> */
1182	/* face :: A handle to the target face object. */
1183	/* */
1184	/* stream :: The input stream. */
1185	/* */
1186	/* <Return> */
1187	/* FreeType error code. 0 means success. */
1188	/* */
1189	FT_LOCAL_DEF( FT_Error )
1190	tt_face_load_gasp( TT_Face face,
1191	FT_Stream stream )
1192	{
1193	FT_Error error;
1194	FT_Memory memory = stream->memory;
1195
1196	FT_UInt j,num_ranges;
1197	TT_GaspRange gaspranges;
1198
1199
1200	/* the gasp table is optional */
1201	error = face->goto_table( face, TTAG_gasp, stream, 0 );
1202	if ( error )
1203	goto Exit;
1204
1205	if ( FT_FRAME_ENTER( 4L ) )
1206	goto Exit;
1207
1208	face->gasp.version = FT_GET_USHORT();
1209	face->gasp.numRanges = FT_GET_USHORT();
1210
1211	FT_FRAME_EXIT();
1212
1213	/* only support versions 0 and 1 of the table */
1214	if ( face->gasp.version >= 2 )
1215	{
1216	face->gasp.numRanges = 0;
1217	error = SFNT_Err_Invalid_Table;
1218	goto Exit;
1219	}
1220
1221	num_ranges = face->gasp.numRanges;
1222	FT_TRACE3(( "numRanges: %u\n", num_ranges ));
1223
1224	if ( FT_QNEW_ARRAY( gaspranges, num_ranges ) \|\|
1225	FT_FRAME_ENTER( num_ranges * 4L ) )
1226	goto Exit;
1227
1228	face->gasp.gaspRanges = gaspranges;
1229
1230	for ( j = 0; j < num_ranges; j++ )
1231	{
1232	gaspranges[j].maxPPEM = FT_GET_USHORT();
1233	gaspranges[j].gaspFlag = FT_GET_USHORT();
1234
1235	FT_TRACE3(( "gaspRange %d: rangeMaxPPEM %5d, rangeGaspBehavior 0x%x\n",
1236	j,
1237	gaspranges[j].maxPPEM,
1238	gaspranges[j].gaspFlag ));
1239	}
1240
1241	FT_FRAME_EXIT();
1242
1243	Exit:
1244	return error;
1245	}
1246
1247
1248	/* END */

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source: svn/trunk/zasc/freetype-2.3.9/ttload.c

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