aboutsummaryrefslogtreecommitdiff
path: root/freetype/src/gxvalid/gxvcommn.h
blob: 4d2bb44b4d82932e6b0216485a37372a74eaccfc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
/***************************************************************************/
/*                                                                         */
/*  gxvcommn.h                                                             */
/*                                                                         */
/*    TrueTypeGX/AAT common tables validation (specification).             */
/*                                                                         */
/*  Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/

/***************************************************************************/
/*                                                                         */
/* gxvalid is derived from both gxlayout module and otvalid module.        */
/* Development of gxlayout is supported by the Information-technology      */
/* Promotion Agency(IPA), Japan.                                           */
/*                                                                         */
/***************************************************************************/


  /*
   * keywords in variable naming
   * ---------------------------
   *  table: Of type FT_Bytes, pointing to the start of this table/subtable.
   *  limit: Of type FT_Bytes, pointing to the end of this table/subtable,
   *         including padding for alignment.
   *  offset: Of type FT_UInt, the number of octets from the start to target.
   *  length: Of type FT_UInt, the number of octets from the start to the
   *          end in this table/subtable, including padding for alignment.
   *
   *  _MIN, _MAX: Should be added to the tail of macros, as INT_MIN, etc.
   */


#ifndef __GXVCOMMN_H__
#define __GXVCOMMN_H__


#include <ft2build.h>
#include "gxvalid.h"
#include <freetype/internal/ftdebug.h>
#include FT_SFNT_NAMES_H


FT_BEGIN_HEADER


  /* some variables are not evaluated or only used in trace */

#ifdef  FT_DEBUG_LEVEL_TRACE
#define GXV_LOAD_TRACE_VARS
#else
#undef  GXV_LOAD_TRACE_VARS
#endif

#undef GXV_LOAD_UNUSED_VARS /* debug purpose */

#define IS_PARANOID_VALIDATION          ( valid->root->level >= FT_VALIDATE_PARANOID )
#define GXV_SET_ERR_IF_PARANOID( err )  { if ( IS_PARANOID_VALIDATION ) ( err ); }

  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                         VALIDATION                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef struct GXV_ValidatorRec_*  GXV_Validator;


#define DUMMY_LIMIT 0

  typedef void
  (*GXV_Validate_Func)( FT_Bytes       table,
                        FT_Bytes       limit,
                        GXV_Validator  valid );


  /* ====================== LookupTable Validator ======================== */

  typedef union  GXV_LookupValueDesc_
  {
    FT_UShort u;
    FT_Short  s;

  } GXV_LookupValueDesc;

  typedef const GXV_LookupValueDesc* GXV_LookupValueCPtr;

  typedef enum  GXV_LookupValue_SignSpec_
  {
    GXV_LOOKUPVALUE_UNSIGNED = 0,
    GXV_LOOKUPVALUE_SIGNED

  } GXV_LookupValue_SignSpec;


  typedef void
  (*GXV_Lookup_Value_Validate_Func)( FT_UShort            glyph,
                                     GXV_LookupValueCPtr  value_p,
                                     GXV_Validator        valid );

  typedef GXV_LookupValueDesc
  (*GXV_Lookup_Fmt4_Transit_Func)( FT_UShort            relative_gindex,
                                   GXV_LookupValueCPtr  base_value_p,
                                   FT_Bytes             lookuptbl_limit,
                                   GXV_Validator        valid );


  /* ====================== StateTable Validator ========================= */

  typedef enum  GXV_GlyphOffset_Format_
  {
    GXV_GLYPHOFFSET_NONE   = -1,
    GXV_GLYPHOFFSET_UCHAR  = 2,
    GXV_GLYPHOFFSET_CHAR,
    GXV_GLYPHOFFSET_USHORT = 4,
    GXV_GLYPHOFFSET_SHORT,
    GXV_GLYPHOFFSET_ULONG  = 8,
    GXV_GLYPHOFFSET_LONG

  } GXV_GlyphOffset_Format;


#define GXV_GLYPHOFFSET_FMT( table )           \
        ( valid->table.entry_glyphoffset_fmt )

#define GXV_GLYPHOFFSET_SIZE( table )              \
        ( valid->table.entry_glyphoffset_fmt / 2 )


  /* ----------------------- 16bit StateTable ---------------------------- */

  typedef union  GXV_StateTable_GlyphOffsetDesc_
  {
    FT_Byte    uc;
    FT_UShort  u;       /* same as GXV_LookupValueDesc */
    FT_ULong   ul;
    FT_Char    c;
    FT_Short   s;       /* same as GXV_LookupValueDesc */
    FT_Long    l;

  } GXV_StateTable_GlyphOffsetDesc;

  typedef const GXV_StateTable_GlyphOffsetDesc* GXV_StateTable_GlyphOffsetCPtr;

  typedef void
  (*GXV_StateTable_Subtable_Setup_Func)( FT_UShort      table_size,
                                         FT_UShort      classTable,
                                         FT_UShort      stateArray,
                                         FT_UShort      entryTable,
                                         FT_UShort*     classTable_length_p,
                                         FT_UShort*     stateArray_length_p,
                                         FT_UShort*     entryTable_length_p,
                                         GXV_Validator  valid );

  typedef void
  (*GXV_StateTable_Entry_Validate_Func)(
     FT_Byte                         state,
     FT_UShort                       flags,
     GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p,
     FT_Bytes                        statetable_table,
     FT_Bytes                        statetable_limit,
     GXV_Validator                   valid );

  typedef void
  (*GXV_StateTable_OptData_Load_Func)( FT_Bytes       table,
                                       FT_Bytes       limit,
                                       GXV_Validator  valid );

  typedef struct  GXV_StateTable_ValidatorRec_
  {
    GXV_GlyphOffset_Format              entry_glyphoffset_fmt;
    void*                               optdata;

    GXV_StateTable_Subtable_Setup_Func  subtable_setup_func;
    GXV_StateTable_Entry_Validate_Func  entry_validate_func;
    GXV_StateTable_OptData_Load_Func    optdata_load_func;

  } GXV_StateTable_ValidatorRec, *GXV_StateTable_ValidatorRecData;


  /* ---------------------- 32bit XStateTable ---------------------------- */

  typedef GXV_StateTable_GlyphOffsetDesc  GXV_XStateTable_GlyphOffsetDesc;

  typedef const GXV_XStateTable_GlyphOffsetDesc* GXV_XStateTable_GlyphOffsetCPtr;

  typedef void
  (*GXV_XStateTable_Subtable_Setup_Func)( FT_ULong       table_size,
                                          FT_ULong       classTable,
                                          FT_ULong       stateArray,
                                          FT_ULong       entryTable,
                                          FT_ULong*      classTable_length_p,
                                          FT_ULong*      stateArray_length_p,
                                          FT_ULong*      entryTable_length_p,
                                          GXV_Validator  valid );

  typedef void
  (*GXV_XStateTable_Entry_Validate_Func)(
     FT_UShort                       state,
     FT_UShort                       flags,
     GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p,
     FT_Bytes                        xstatetable_table,
     FT_Bytes                        xstatetable_limit,
     GXV_Validator                   valid );


  typedef GXV_StateTable_OptData_Load_Func  GXV_XStateTable_OptData_Load_Func;


  typedef struct  GXV_XStateTable_ValidatorRec_
  {
    int                                  entry_glyphoffset_fmt;
    void*                                optdata;

    GXV_XStateTable_Subtable_Setup_Func  subtable_setup_func;
    GXV_XStateTable_Entry_Validate_Func  entry_validate_func;
    GXV_XStateTable_OptData_Load_Func    optdata_load_func;

    FT_ULong                             nClasses;
    FT_UShort                            maxClassID;

  } GXV_XStateTable_ValidatorRec, *GXV_XStateTable_ValidatorRecData;


  /* ===================================================================== */

  typedef struct  GXV_ValidatorRec_
  {
    FT_Validator  root;

    FT_Face       face;
    void*         table_data;

    FT_ULong      subtable_length;

    GXV_LookupValue_SignSpec        lookupval_sign;
    GXV_Lookup_Value_Validate_Func  lookupval_func;
    GXV_Lookup_Fmt4_Transit_Func    lookupfmt4_trans;
    FT_Bytes                        lookuptbl_head;

    FT_UShort  min_gid;
    FT_UShort  max_gid;

    GXV_StateTable_ValidatorRec     statetable;
    GXV_XStateTable_ValidatorRec    xstatetable;

#ifdef FT_DEBUG_LEVEL_TRACE
    FT_UInt             debug_indent;
    const FT_String*    debug_function_name[3];
#endif

  } GXV_ValidatorRec;


#define GXV_TABLE_DATA( tag, field )                           \
        ( ( (GXV_ ## tag ## _Data)valid->table_data )->field )

#undef  FT_INVALID_
#define FT_INVALID_( _prefix, _error )                         \
          ft_validator_error( valid->root, _prefix ## _error )

#define GXV_LIMIT_CHECK( _count )                                     \
          FT_BEGIN_STMNT                                              \
            if ( p + _count > ( limit? limit : valid->root->limit ) ) \
              FT_INVALID_TOO_SHORT;                                   \
          FT_END_STMNT


#ifdef FT_DEBUG_LEVEL_TRACE

#define GXV_INIT  valid->debug_indent = 0

#define GXV_NAME_ENTER( name )                             \
          FT_BEGIN_STMNT                                   \
            valid->debug_indent += 2;                      \
            FT_TRACE4(( "%*.s", valid->debug_indent, 0 )); \
            FT_TRACE4(( "%s table\n", name ));             \
          FT_END_STMNT

#define GXV_EXIT  valid->debug_indent -= 2

#define GXV_TRACE( s )                                     \
          FT_BEGIN_STMNT                                   \
            FT_TRACE4(( "%*.s", valid->debug_indent, 0 )); \
            FT_TRACE4( s );                                \
          FT_END_STMNT

#else /* !FT_DEBUG_LEVEL_TRACE */

#define GXV_INIT                do { } while ( 0 )
#define GXV_NAME_ENTER( name )  do { } while ( 0 )
#define GXV_EXIT                do { } while ( 0 )

#define GXV_TRACE( s )          do { } while ( 0 )

#endif  /* !FT_DEBUG_LEVEL_TRACE */


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                    32bit alignment checking                   *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

#define GXV_32BIT_ALIGNMENT_VALIDATE( a ) \
          FT_BEGIN_STMNT                  \
            {                             \
              if ( 0 != ( (a) % 4 ) )     \
                FT_INVALID_OFFSET ;       \
            }                             \
          FT_END_STMNT


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                    Dumping Binary Data                        *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

#define GXV_TRACE_HEXDUMP( p, len )                     \
          FT_BEGIN_STMNT                                \
            {                                           \
              FT_Bytes  b;                              \
                                                        \
                                                        \
              for ( b = p; b < (FT_Bytes)p + len; b++ ) \
                FT_TRACE1(("\\x%02x", *b)) ;            \
            }                                           \
          FT_END_STMNT

#define GXV_TRACE_HEXDUMP_C( p, len )                   \
          FT_BEGIN_STMNT                                \
            {                                           \
              FT_Bytes  b;                              \
                                                        \
                                                        \
              for ( b = p; b < (FT_Bytes)p + len; b++ ) \
                if ( 0x40 < *b && *b < 0x7e )           \
                  FT_TRACE1(("%c", *b)) ;               \
                else                                    \
                  FT_TRACE1(("\\x%02x", *b)) ;          \
            }                                           \
          FT_END_STMNT

#define GXV_TRACE_HEXDUMP_SFNTNAME( n )               \
          GXV_TRACE_HEXDUMP( n.string, n.string_len )


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                         LOOKUP TABLE                          *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL( void )
  gxv_BinSrchHeader_validate( FT_Bytes       p,
                              FT_Bytes       limit,
                              FT_UShort*     unitSize_p,
                              FT_UShort*     nUnits_p,
                              GXV_Validator  valid );

  FT_LOCAL( void )
  gxv_LookupTable_validate( FT_Bytes       table,
                            FT_Bytes       limit,
                            GXV_Validator  valid );


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                          Glyph ID                             *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL( FT_Int )
  gxv_glyphid_validate( FT_UShort      gid,
                        GXV_Validator  valid );


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                        CONTROL POINT                          *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL( void )
  gxv_ctlPoint_validate( FT_UShort      gid,
                         FT_Short       ctl_point,
                         GXV_Validator  valid );


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                          SFNT NAME                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL( void )
  gxv_sfntName_validate( FT_UShort      name_index,
                         FT_UShort      min_index,
                         FT_UShort      max_index,
                         GXV_Validator  valid );


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                          STATE TABLE                          *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL( void )
  gxv_StateTable_subtable_setup( FT_UShort      table_size,
                                 FT_UShort      classTable,
                                 FT_UShort      stateArray,
                                 FT_UShort      entryTable,
                                 FT_UShort*     classTable_length_p,
                                 FT_UShort*     stateArray_length_p,
                                 FT_UShort*     entryTable_length_p,
                                 GXV_Validator  valid );

  FT_LOCAL( void )
  gxv_XStateTable_subtable_setup( FT_ULong       table_size,
                                  FT_ULong       classTable,
                                  FT_ULong       stateArray,
                                  FT_ULong       entryTable,
                                  FT_ULong*      classTable_length_p,
                                  FT_ULong*      stateArray_length_p,
                                  FT_ULong*      entryTable_length_p,
                                  GXV_Validator  valid );

  FT_LOCAL( void )
  gxv_StateTable_validate( FT_Bytes       table,
                           FT_Bytes       limit,
                           GXV_Validator  valid );

  FT_LOCAL( void )
  gxv_XStateTable_validate( FT_Bytes       table,
                            FT_Bytes       limit,
                            GXV_Validator  valid );


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                 UTILITY MACROS AND FUNCTIONS                  *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL( void )
  gxv_array_getlimits_byte( FT_Bytes       table,
                            FT_Bytes       limit,
                            FT_Byte*       min,
                            FT_Byte*       max,
                            GXV_Validator  valid );

  FT_LOCAL( void )
  gxv_array_getlimits_ushort( FT_Bytes       table,
                              FT_Bytes       limit,
                              FT_UShort*     min,
                              FT_UShort*     max,
                              GXV_Validator  valid );

  FT_LOCAL( void )
  gxv_set_length_by_ushort_offset( FT_UShort*     offset,
                                   FT_UShort**    length,
                                   FT_UShort*     buff,
                                   FT_UInt        nmemb,
                                   FT_UShort      limit,
                                   GXV_Validator  valid );

  FT_LOCAL( void )
  gxv_set_length_by_ulong_offset( FT_ULong*      offset,
                                  FT_ULong**     length,
                                  FT_ULong*      buff,
                                  FT_UInt        nmemb,
                                  FT_ULong       limit,
                                  GXV_Validator  valid);


#define GXV_SUBTABLE_OFFSET_CHECK( _offset )          \
          FT_BEGIN_STMNT                              \
            if ( (_offset) > valid->subtable_length ) \
              FT_INVALID_OFFSET;                      \
          FT_END_STMNT

#define GXV_SUBTABLE_LIMIT_CHECK( _count )                  \
          FT_BEGIN_STMNT                                    \
            if ( ( p + (_count) - valid->subtable_start ) > \
                   valid->subtable_length )                 \
              FT_INVALID_TOO_SHORT;                         \
          FT_END_STMNT

#define GXV_USHORT_TO_SHORT( _us )                                    \
          ( ( 0x8000U < ( _us ) ) ? ( ( _us ) - 0x8000U ) : ( _us ) )

#define GXV_STATETABLE_HEADER_SIZE  ( 2 + 2 + 2 + 2 )
#define GXV_STATEHEADER_SIZE        GXV_STATETABLE_HEADER_SIZE

#define GXV_XSTATETABLE_HEADER_SIZE  ( 4 + 4 + 4 + 4 )
#define GXV_XSTATEHEADER_SIZE        GXV_XSTATETABLE_HEADER_SIZE


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                        Table overlapping                      *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef struct  GXV_odtect_DataRec_
  {
    FT_Bytes    start;
    FT_ULong    length;
    FT_String*  name;

  } GXV_odtect_DataRec,  *GXV_odtect_Data;

  typedef struct  GXV_odtect_RangeRec_
  {
    FT_UInt          nRanges;
    GXV_odtect_Data  range;

  } GXV_odtect_RangeRec, *GXV_odtect_Range;


  FT_LOCAL( void )
  gxv_odtect_add_range( FT_Bytes          start,
                        FT_ULong          length,
                        const FT_String*  name,
                        GXV_odtect_Range  odtect );

  FT_LOCAL( void )
  gxv_odtect_validate( GXV_odtect_Range  odtect,
                       GXV_Validator     valid );


#define GXV_ODTECT( n, odtect )                              \
          GXV_odtect_DataRec   odtect ## _range[n];          \
          GXV_odtect_RangeRec  odtect ## _rec = { 0, NULL }; \
          GXV_odtect_Range     odtect = NULL

#define GXV_ODTECT_INIT( odtect )                      \
          FT_BEGIN_STMNT                               \
            odtect ## _rec.nRanges = 0;                \
            odtect ## _rec.range   = odtect ## _range; \
            odtect                 = & odtect ## _rec; \
          FT_END_STMNT


 /* */

FT_END_HEADER

#endif /* __GXVCOMMN_H__ */


/* END */