1 /****************************************************************************
2 *
3 * otvgdef.c
4 *
5 * OpenType GDEF table validation (body).
6 *
7 * Copyright (C) 2004-2023 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 "otvalid.h"
20 #include "otvcommn.h"
21
22
23 /**************************************************************************
24 *
25 * The macro FT_COMPONENT is used in trace mode. It is an implicit
26 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
27 * messages during execution.
28 */
29 #undef FT_COMPONENT
30 #define FT_COMPONENT otvgdef
31
32
33 /*************************************************************************/
34 /*************************************************************************/
35 /***** *****/
36 /***** UTILITY FUNCTIONS *****/
37 /***** *****/
38 /*************************************************************************/
39 /*************************************************************************/
40
41 #define AttachListFunc otv_O_x_Ox
42 #define LigCaretListFunc otv_O_x_Ox
43
44 /* sets valid->extra1 (0) */
45
46 static void
47 otv_O_x_Ox( FT_Bytes table,
48 OTV_Validator otvalid )
49 {
50 FT_Bytes p = table;
51 FT_Bytes Coverage;
52 FT_UInt GlyphCount;
53 OTV_Validate_Func func;
54
55
56 OTV_ENTER;
57
58 OTV_LIMIT_CHECK( 4 );
59 Coverage = table + FT_NEXT_USHORT( p );
60 GlyphCount = FT_NEXT_USHORT( p );
61
62 OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
63
64 otv_Coverage_validate( Coverage, otvalid, (FT_Int)GlyphCount );
65 if ( GlyphCount != otv_Coverage_get_count( Coverage ) )
66 FT_INVALID_DATA;
67
68 OTV_LIMIT_CHECK( GlyphCount * 2 );
69
70 otvalid->nesting_level++;
71 func = otvalid->func[otvalid->nesting_level];
72 otvalid->extra1 = 0;
73
74 for ( ; GlyphCount > 0; GlyphCount-- )
75 func( table + FT_NEXT_USHORT( p ), otvalid );
76
77 otvalid->nesting_level--;
78
79 OTV_EXIT;
80 }
81
82
83 /*************************************************************************/
84 /*************************************************************************/
85 /***** *****/
86 /***** LIGATURE CARETS *****/
87 /***** *****/
88 /*************************************************************************/
89 /*************************************************************************/
90
91 #define CaretValueFunc otv_CaretValue_validate
92
93 static void
94 otv_CaretValue_validate( FT_Bytes table,
95 OTV_Validator otvalid )
96 {
97 FT_Bytes p = table;
98 FT_UInt CaretValueFormat;
99
100
101 OTV_ENTER;
102
103 OTV_LIMIT_CHECK( 4 );
104
105 CaretValueFormat = FT_NEXT_USHORT( p );
106
107 OTV_TRACE(( " (format = %d)\n", CaretValueFormat ));
108
109 switch ( CaretValueFormat )
110 {
111 case 1: /* CaretValueFormat1 */
112 /* skip Coordinate, no test */
113 break;
114
115 case 2: /* CaretValueFormat2 */
116 /* skip CaretValuePoint, no test */
117 break;
118
119 case 3: /* CaretValueFormat3 */
120 p += 2; /* skip Coordinate */
121
122 OTV_LIMIT_CHECK( 2 );
123
124 /* DeviceTable */
125 otv_Device_validate( table + FT_NEXT_USHORT( p ), otvalid );
126 break;
127
128 default:
129 FT_INVALID_FORMAT;
130 }
131
132 OTV_EXIT;
133 }
134
135
136 /*************************************************************************/
137 /*************************************************************************/
138 /***** *****/
139 /***** MARK GLYPH SETS *****/
140 /***** *****/
141 /*************************************************************************/
142 /*************************************************************************/
143
144 static void
145 otv_MarkGlyphSets_validate( FT_Bytes table,
146 OTV_Validator otvalid )
147 {
148 FT_Bytes p = table;
149 FT_UInt MarkGlyphSetCount;
150
151
152 OTV_NAME_ENTER( "MarkGlyphSets" );
153
154 p += 2; /* skip Format */
155
156 OTV_LIMIT_CHECK( 2 );
157 MarkGlyphSetCount = FT_NEXT_USHORT( p );
158
159 OTV_TRACE(( " (MarkGlyphSetCount = %d)\n", MarkGlyphSetCount ));
160
161 OTV_LIMIT_CHECK( MarkGlyphSetCount * 4 ); /* CoverageOffsets */
162
163 for ( ; MarkGlyphSetCount > 0; MarkGlyphSetCount-- )
164 otv_Coverage_validate( table + FT_NEXT_ULONG( p ), otvalid, -1 );
165
166 OTV_EXIT;
167 }
168
169
170 /*************************************************************************/
171 /*************************************************************************/
172 /***** *****/
173 /***** GDEF TABLE *****/
174 /***** *****/
175 /*************************************************************************/
176 /*************************************************************************/
177
178 /* sets otvalid->glyph_count */
179
180 FT_LOCAL_DEF( void )
181 otv_GDEF_validate( FT_Bytes table,
182 FT_Bytes gsub,
183 FT_Bytes gpos,
184 FT_UInt glyph_count,
185 FT_Validator ftvalid )
186 {
187 OTV_ValidatorRec otvalidrec;
188 OTV_Validator otvalid = &otvalidrec;
189 FT_Bytes p = table;
190 FT_UInt table_size;
191 FT_UShort version;
192 FT_Bool need_MarkAttachClassDef = 1;
193
194 OTV_OPTIONAL_TABLE( GlyphClassDef );
195 OTV_OPTIONAL_TABLE( AttachListOffset );
196 OTV_OPTIONAL_TABLE( LigCaretListOffset );
197 OTV_OPTIONAL_TABLE( MarkAttachClassDef );
198 OTV_OPTIONAL_TABLE( MarkGlyphSetsDef );
199
200 OTV_OPTIONAL_TABLE32( itemVarStore );
201
202
203 otvalid->root = ftvalid;
204
205 FT_TRACE3(( "validating GDEF table\n" ));
206 OTV_INIT;
207
208 OTV_LIMIT_CHECK( 4 );
209
210 if ( FT_NEXT_USHORT( p ) != 1 ) /* majorVersion */
211 FT_INVALID_FORMAT;
212
213 version = FT_NEXT_USHORT( p ); /* minorVersion */
214
215 table_size = 10;
216 switch ( version )
217 {
218 case 0:
219 /* MarkAttachClassDef has been added to the OpenType */
220 /* specification without increasing GDEF's version, */
221 /* so we use this ugly hack to find out whether the */
222 /* table is needed actually. */
223
224 need_MarkAttachClassDef = FT_BOOL(
225 otv_GSUBGPOS_have_MarkAttachmentType_flag( gsub ) ||
226 otv_GSUBGPOS_have_MarkAttachmentType_flag( gpos ) );
227
228 if ( need_MarkAttachClassDef )
229 {
230 OTV_LIMIT_CHECK( 8 );
231 table_size += 2;
232 }
233 else
234 OTV_LIMIT_CHECK( 6 ); /* OpenType < 1.2 */
235
236 break;
237
238 case 2:
239 OTV_LIMIT_CHECK( 10 );
240 table_size += 4;
241 break;
242
243 case 3:
244 OTV_LIMIT_CHECK( 14 );
245 table_size += 8;
246 break;
247
248 default:
249 FT_INVALID_FORMAT;
250 }
251
252 otvalid->glyph_count = glyph_count;
253
254 OTV_OPTIONAL_OFFSET( GlyphClassDef );
255 OTV_SIZE_CHECK( GlyphClassDef );
256 if ( GlyphClassDef )
257 otv_ClassDef_validate( table + GlyphClassDef, otvalid );
258
259 OTV_OPTIONAL_OFFSET( AttachListOffset );
260 OTV_SIZE_CHECK( AttachListOffset );
261 if ( AttachListOffset )
262 {
263 OTV_NEST2( AttachList, AttachPoint );
264 OTV_RUN( table + AttachListOffset, otvalid );
265 }
266
267 OTV_OPTIONAL_OFFSET( LigCaretListOffset );
268 OTV_SIZE_CHECK( LigCaretListOffset );
269 if ( LigCaretListOffset )
270 {
271 OTV_NEST3( LigCaretList, LigGlyph, CaretValue );
272 OTV_RUN( table + LigCaretListOffset, otvalid );
273 }
274
275 if ( need_MarkAttachClassDef )
276 {
277 OTV_OPTIONAL_OFFSET( MarkAttachClassDef );
278 OTV_SIZE_CHECK( MarkAttachClassDef );
279 if ( MarkAttachClassDef )
280 otv_ClassDef_validate( table + MarkAttachClassDef, otvalid );
281 }
282
283 if ( version > 0 )
284 {
285 OTV_OPTIONAL_OFFSET( MarkGlyphSetsDef );
286 OTV_SIZE_CHECK( MarkGlyphSetsDef );
287 if ( MarkGlyphSetsDef )
288 otv_MarkGlyphSets_validate( table + MarkGlyphSetsDef, otvalid );
289 }
290
291 if ( version > 2 )
292 {
293 OTV_OPTIONAL_OFFSET32( itemVarStore );
294 OTV_SIZE_CHECK32( itemVarStore );
295 if ( itemVarStore )
296 OTV_TRACE(( " [omitting itemVarStore validation]\n" )); /* XXX */
297 }
298
299 FT_TRACE4(( "\n" ));
300 }
301
302
303 /* END */