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
|
/***************************************************************************/
/* */
/* gxvbsln.c */
/* */
/* TrueTypeGX/AAT bsln table validation (body). */
/* */
/* 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. */
/* */
/***************************************************************************/
#include "gxvalid.h"
#include "gxvcommn.h"
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_gxvbsln
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** Data and Types *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define GXV_BSLN_VALUE_COUNT 32
#define GXV_BSLN_VALUE_EMPTY 0xFFFFU
typedef struct GXV_bsln_DataRec_
{
FT_Bytes ctlPoints_p;
FT_UShort defaultBaseline;
} GXV_bsln_DataRec, *GXV_bsln_Data;
#define GXV_BSLN_DATA( field ) GXV_TABLE_DATA( bsln, field )
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** UTILITY FUNCTIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
gxv_bsln_LookupValue_validate( FT_UShort glyph,
GXV_LookupValueCPtr value_p,
GXV_Validator valid )
{
FT_UShort v = value_p->u;
FT_UShort* ctlPoints;
FT_UNUSED( glyph );
GXV_NAME_ENTER( "lookup value" );
if ( v >= GXV_BSLN_VALUE_COUNT )
FT_INVALID_DATA;
ctlPoints = (FT_UShort*)GXV_BSLN_DATA( ctlPoints_p );
if ( ctlPoints && ctlPoints[v] == GXV_BSLN_VALUE_EMPTY )
FT_INVALID_DATA;
GXV_EXIT;
}
/*
+===============+ --------+
| lookup header | |
+===============+ |
| BinSrchHeader | |
+===============+ |
| lastGlyph[0] | |
+---------------+ |
| firstGlyph[0] | | head of lookup table
+---------------+ | +
| offset[0] | -> | offset [byte]
+===============+ | +
| lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
+---------------+ |
| firstGlyph[1] | |
+---------------+ |
| offset[1] | |
+===============+ |
|
... |
|
16bit value array |
+===============+ |
| value | <-------+
...
*/
static GXV_LookupValueDesc
gxv_bsln_LookupFmt4_transit( FT_UShort relative_gindex,
GXV_LookupValueCPtr base_value_p,
FT_Bytes lookuptbl_limit,
GXV_Validator valid )
{
FT_Bytes p;
FT_Bytes limit;
FT_UShort offset;
GXV_LookupValueDesc value;
/* XXX: check range ? */
offset = (FT_UShort)( base_value_p->u +
( relative_gindex * sizeof ( FT_UShort ) ) );
p = valid->lookuptbl_head + offset;
limit = lookuptbl_limit;
GXV_LIMIT_CHECK( 2 );
value.u = FT_NEXT_USHORT( p );
return value;
}
static void
gxv_bsln_parts_fmt0_validate( FT_Bytes tables,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = tables;
GXV_NAME_ENTER( "parts format 0" );
/* deltas */
GXV_LIMIT_CHECK( 2 * GXV_BSLN_VALUE_COUNT );
valid->table_data = NULL; /* No ctlPoints here. */
GXV_EXIT;
}
static void
gxv_bsln_parts_fmt1_validate( FT_Bytes tables,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = tables;
GXV_NAME_ENTER( "parts format 1" );
/* deltas */
gxv_bsln_parts_fmt0_validate( p, limit, valid );
/* mappingData */
valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
valid->lookupval_func = gxv_bsln_LookupValue_validate;
valid->lookupfmt4_trans = gxv_bsln_LookupFmt4_transit;
gxv_LookupTable_validate( p + 2 * GXV_BSLN_VALUE_COUNT,
limit,
valid );
GXV_EXIT;
}
static void
gxv_bsln_parts_fmt2_validate( FT_Bytes tables,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = tables;
FT_UShort stdGlyph;
FT_UShort ctlPoint;
FT_Int i;
FT_UShort defaultBaseline = GXV_BSLN_DATA( defaultBaseline );
GXV_NAME_ENTER( "parts format 2" );
GXV_LIMIT_CHECK( 2 + ( 2 * GXV_BSLN_VALUE_COUNT ) );
/* stdGlyph */
stdGlyph = FT_NEXT_USHORT( p );
GXV_TRACE(( " (stdGlyph = %u)\n", stdGlyph ));
gxv_glyphid_validate( stdGlyph, valid );
/* Record the position of ctlPoints */
GXV_BSLN_DATA( ctlPoints_p ) = p;
/* ctlPoints */
for ( i = 0; i < GXV_BSLN_VALUE_COUNT; i++ )
{
ctlPoint = FT_NEXT_USHORT( p );
if ( ctlPoint == GXV_BSLN_VALUE_EMPTY )
{
if ( i == defaultBaseline )
FT_INVALID_DATA;
}
else
gxv_ctlPoint_validate( stdGlyph, (FT_Short)ctlPoint, valid );
}
GXV_EXIT;
}
static void
gxv_bsln_parts_fmt3_validate( FT_Bytes tables,
FT_Bytes limit,
GXV_Validator valid)
{
FT_Bytes p = tables;
GXV_NAME_ENTER( "parts format 3" );
/* stdGlyph + ctlPoints */
gxv_bsln_parts_fmt2_validate( p, limit, valid );
/* mappingData */
valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
valid->lookupval_func = gxv_bsln_LookupValue_validate;
valid->lookupfmt4_trans = gxv_bsln_LookupFmt4_transit;
gxv_LookupTable_validate( p + ( 2 + 2 * GXV_BSLN_VALUE_COUNT ),
limit,
valid );
GXV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** bsln TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
gxv_bsln_validate( FT_Bytes table,
FT_Face face,
FT_Validator ftvalid )
{
GXV_ValidatorRec validrec;
GXV_Validator valid = &validrec;
GXV_bsln_DataRec bslnrec;
GXV_bsln_Data bsln = &bslnrec;
FT_Bytes p = table;
FT_Bytes limit = 0;
FT_ULong version;
FT_UShort format;
FT_UShort defaultBaseline;
GXV_Validate_Func fmt_funcs_table [] =
{
gxv_bsln_parts_fmt0_validate,
gxv_bsln_parts_fmt1_validate,
gxv_bsln_parts_fmt2_validate,
gxv_bsln_parts_fmt3_validate,
};
valid->root = ftvalid;
valid->table_data = bsln;
valid->face = face;
FT_TRACE3(( "validating `bsln' table\n" ));
GXV_INIT;
GXV_LIMIT_CHECK( 4 + 2 + 2 );
version = FT_NEXT_ULONG( p );
format = FT_NEXT_USHORT( p );
defaultBaseline = FT_NEXT_USHORT( p );
/* only version 1.0 is defined (1996) */
if ( version != 0x00010000UL )
FT_INVALID_FORMAT;
/* only format 1, 2, 3 are defined (1996) */
GXV_TRACE(( " (format = %d)\n", format ));
if ( format > 3 )
FT_INVALID_FORMAT;
if ( defaultBaseline > 31 )
FT_INVALID_FORMAT;
bsln->defaultBaseline = defaultBaseline;
fmt_funcs_table[format]( p, limit, valid );
FT_TRACE4(( "\n" ));
}
/* arch-tag: ebe81143-fdaa-4c68-a4d1-b57227daa3bc
(do not change this comment) */
/* END */
|
