zenilib: zenilib/jni/external/freetype2/src/gxvalid/gxvmort2.c Source File

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gxvmort2.c
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1 /***************************************************************************/
2 /* */
3 /* gxvmort2.c */
4 /* */
5 /* TrueTypeGX/AAT mort table validation */
6 /* body for type2 (Ligature Substitution) subtable. */
7 /* */
8 /* Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
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 /* gxvalid is derived from both gxlayout module and otvalid module. */
22 /* Development of gxlayout is supported by the Information-technology */
23 /* Promotion Agency(IPA), Japan. */
24 /* */
25 /***************************************************************************/
26
27
28 #include "gxvmort.h"
29
30
31 /*************************************************************************/
32 /* */
33 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
34 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
35 /* messages during execution. */
36 /* */
37 #undef FT_COMPONENT
38 #define FT_COMPONENT trace_gxvmort
39
40
41 typedef struct GXV_mort_subtable_type2_StateOptRec_
42 {
43 FT_UShort ligActionTable;
44 FT_UShort componentTable;
45 FT_UShort ligatureTable;
46 FT_UShort ligActionTable_length;
47 FT_UShort componentTable_length;
48 FT_UShort ligatureTable_length;
49
50 } GXV_mort_subtable_type2_StateOptRec,
51 *GXV_mort_subtable_type2_StateOptRecData;
52
53 #define GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE \
54 ( GXV_STATETABLE_HEADER_SIZE + 2 + 2 + 2 )
55
56
57 static void
58 gxv_mort_subtable_type2_opttable_load( FT_Bytes table,
59 FT_Bytes limit,
60 GXV_Validator valid )
61 {
62 FT_Bytes p = table;
63 GXV_mort_subtable_type2_StateOptRecData optdata =
64 (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata;
65
66
67 GXV_LIMIT_CHECK( 2 + 2 + 2 );
68 optdata->ligActionTable = FT_NEXT_USHORT( p );
69 optdata->componentTable = FT_NEXT_USHORT( p );
70 optdata->ligatureTable = FT_NEXT_USHORT( p );
71
72 GXV_TRACE(( "offset to ligActionTable=0x%04x\n",
73 optdata->ligActionTable ));
74 GXV_TRACE(( "offset to componentTable=0x%04x\n",
75 optdata->componentTable ));
76 GXV_TRACE(( "offset to ligatureTable=0x%04x\n",
77 optdata->ligatureTable ));
78 }
79
80
81 static void
82 gxv_mort_subtable_type2_subtable_setup( FT_UShort table_size,
83 FT_UShort classTable,
84 FT_UShort stateArray,
85 FT_UShort entryTable,
86 FT_UShort *classTable_length_p,
87 FT_UShort *stateArray_length_p,
88 FT_UShort *entryTable_length_p,
89 GXV_Validator valid )
90 {
91 FT_UShort o[6];
92 FT_UShort *l[6];
93 FT_UShort buff[7];
94
95 GXV_mort_subtable_type2_StateOptRecData optdata =
96 (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata;
97
98
99 GXV_NAME_ENTER( "subtable boundaries setup" );
100
101 o[0] = classTable;
102 o[1] = stateArray;
103 o[2] = entryTable;
104 o[3] = optdata->ligActionTable;
105 o[4] = optdata->componentTable;
106 o[5] = optdata->ligatureTable;
107 l[0] = classTable_length_p;
108 l[1] = stateArray_length_p;
109 l[2] = entryTable_length_p;
110 l[3] = &(optdata->ligActionTable_length);
111 l[4] = &(optdata->componentTable_length);
112 l[5] = &(optdata->ligatureTable_length);
113
114 gxv_set_length_by_ushort_offset( o, l, buff, 6, table_size, valid );
115
116 GXV_TRACE(( "classTable: offset=0x%04x length=0x%04x\n",
117 classTable, *classTable_length_p ));
118 GXV_TRACE(( "stateArray: offset=0x%04x length=0x%04x\n",
119 stateArray, *stateArray_length_p ));
120 GXV_TRACE(( "entryTable: offset=0x%04x length=0x%04x\n",
121 entryTable, *entryTable_length_p ));
122 GXV_TRACE(( "ligActionTable: offset=0x%04x length=0x%04x\n",
123 optdata->ligActionTable,
124 optdata->ligActionTable_length ));
125 GXV_TRACE(( "componentTable: offset=0x%04x length=0x%04x\n",
126 optdata->componentTable,
127 optdata->componentTable_length ));
128 GXV_TRACE(( "ligatureTable: offset=0x%04x length=0x%04x\n",
129 optdata->ligatureTable,
130 optdata->ligatureTable_length ));
131
132 GXV_EXIT;
133 }
134
135
136 static void
137 gxv_mort_subtable_type2_ligActionOffset_validate(
138 FT_Bytes table,
139 FT_UShort ligActionOffset,
140 GXV_Validator valid )
141 {
142 /* access ligActionTable */
143 GXV_mort_subtable_type2_StateOptRecData optdata =
144 (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata;
145
146 FT_Bytes lat_base = table + optdata->ligActionTable;
147 FT_Bytes p = table + ligActionOffset;
148 FT_Bytes lat_limit = lat_base + optdata->ligActionTable;
149
150
151 GXV_32BIT_ALIGNMENT_VALIDATE( ligActionOffset );
152 if ( p < lat_base )
153 {
154 GXV_TRACE(( "too short offset 0x%04x: p < lat_base (%d byte rewind)\n",
155 ligActionOffset, lat_base - p ));
156
157 /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */
158 GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
159 }
160 else if ( lat_limit < p )
161 {
162 GXV_TRACE(( "too large offset 0x%04x: lat_limit < p (%d byte overrun)\n",
163 ligActionOffset, p - lat_limit ));
164
165 /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */
166 GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
167 }
168 else
169 {
170 /* validate entry in ligActionTable */
171 FT_ULong lig_action;
172 #ifdef GXV_LOAD_UNUSED_VARS
173 FT_UShort last;
174 FT_UShort store;
175 #endif
176 FT_ULong offset;
177
178
179 lig_action = FT_NEXT_ULONG( p );
180 #ifdef GXV_LOAD_UNUSED_VARS
181 last = (FT_UShort)( ( lig_action >> 31 ) & 1 );
182 store = (FT_UShort)( ( lig_action >> 30 ) & 1 );
183 #endif
184
185 /* Apple spec defines this offset as a word offset */
186 offset = lig_action & 0x3FFFFFFFUL;
187 if ( offset * 2 < optdata->ligatureTable )
188 {
189 GXV_TRACE(( "too short offset 0x%08x:"
190 " 2 x offset < ligatureTable (%d byte rewind)\n",
191 offset, optdata->ligatureTable - offset * 2 ));
192
193 GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
194 } else if ( offset * 2 >
195 optdata->ligatureTable + optdata->ligatureTable_length )
196 {
197 GXV_TRACE(( "too long offset 0x%08x:"
198 " 2 x offset > ligatureTable + ligatureTable_length"
199 " (%d byte overrun)\n",
200 offset,
201 optdata->ligatureTable + optdata->ligatureTable_length
202 - offset * 2 ));
203
204 GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
205 }
206 }
207 }
208
209
210 static void
211 gxv_mort_subtable_type2_entry_validate(
212 FT_Byte state,
213 FT_UShort flags,
214 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,
215 FT_Bytes table,
216 FT_Bytes limit,
217 GXV_Validator valid )
218 {
219 #ifdef GXV_LOAD_UNUSED_VARS
220 FT_UShort setComponent;
221 FT_UShort dontAdvance;
222 #endif
223 FT_UShort offset;
224
225 FT_UNUSED( state );
226 FT_UNUSED( glyphOffset_p );
227 FT_UNUSED( limit );
228
229
230 #ifdef GXV_LOAD_UNUSED_VARS
231 setComponent = (FT_UShort)( ( flags >> 15 ) & 1 );
232 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
233 #endif
234
235 offset = (FT_UShort)( flags & 0x3FFFU );
236
237 if ( 0 < offset )
238 gxv_mort_subtable_type2_ligActionOffset_validate( table, offset,
239 valid );
240 }
241
242
243 static void
244 gxv_mort_subtable_type2_ligatureTable_validate( FT_Bytes table,
245 GXV_Validator valid )
246 {
247 GXV_mort_subtable_type2_StateOptRecData optdata =
248 (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata;
249
250 FT_Bytes p = table + optdata->ligatureTable;
251 FT_Bytes limit = table + optdata->ligatureTable
252 + optdata->ligatureTable_length;
253
254
255 GXV_NAME_ENTER( "mort chain subtable type2 - substitutionTable" );
256 if ( 0 != optdata->ligatureTable )
257 {
258 /* Apple does not give specification of ligatureTable format */
259 while ( p < limit )
260 {
261 FT_UShort lig_gid;
262
263
264 GXV_LIMIT_CHECK( 2 );
265 lig_gid = FT_NEXT_USHORT( p );
266
267 if ( valid->face->num_glyphs < lig_gid )
268 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID );
269 }
270 }
271 GXV_EXIT;
272 }
273
274
275 FT_LOCAL_DEF( void )
276 gxv_mort_subtable_type2_validate( FT_Bytes table,
277 FT_Bytes limit,
278 GXV_Validator valid )
279 {
280 FT_Bytes p = table;
281
282 GXV_mort_subtable_type2_StateOptRec lig_rec;
283
284
285 GXV_NAME_ENTER( "mort chain subtable type2 (Ligature Substitution)" );
286
287 GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE );
288
289 valid->statetable.optdata =
290 &lig_rec;
291 valid->statetable.optdata_load_func =
292 gxv_mort_subtable_type2_opttable_load;
293 valid->statetable.subtable_setup_func =
294 gxv_mort_subtable_type2_subtable_setup;
295 valid->statetable.entry_glyphoffset_fmt =
296 GXV_GLYPHOFFSET_NONE;
297 valid->statetable.entry_validate_func =
298 gxv_mort_subtable_type2_entry_validate;
299
300 gxv_StateTable_validate( p, limit, valid );
301
302 p += valid->subtable_length;
303 gxv_mort_subtable_type2_ligatureTable_validate( table, valid );
304
305 valid->subtable_length = p - table;
306
307 GXV_EXIT;
308 }
309
310
311 /* END */
table
GLenum GLsizei GLenum GLenum const GLvoid * table
Definition: glew.h:4422
gxv_mort_subtable_type2_entry_validate
static void gxv_mort_subtable_type2_entry_validate(FT_Byte state, FT_UShort flags, GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmort2.c:211
FT_ULong
unsigned long FT_ULong
Definition: fttypes.h:249
GXV_StateTable_ValidatorRec_::optdata
void * optdata
Definition: gxvcommn.h:182
GXV_NAME_ENTER
#define GXV_NAME_ENTER(name)
Definition: gxvcommn.h:301
GXV_TRACE
#define GXV_TRACE(s)
Definition: gxvcommn.h:304
GXV_ValidatorRec_::face
FT_Face face
Definition: gxvcommn.h:241
GXV_StateTable_GlyphOffsetDesc_
Definition: gxvcommn.h:142
gxvmort.h
GXV_SET_ERR_IF_PARANOID
#define GXV_SET_ERR_IF_PARANOID(err)
Definition: gxvcommn.h:66
GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE
#define GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE
Definition: gxvmort2.c:53
FT_Byte
unsigned char FT_Byte
Definition: fttypes.h:150
GXV_GLYPHOFFSET_NONE
Definition: gxvcommn.h:122
GXV_ValidatorRec_::statetable
GXV_StateTable_ValidatorRec statetable
Definition: gxvcommn.h:254
GXV_EXIT
#define GXV_EXIT
Definition: gxvcommn.h:302
FT_LOCAL_DEF
#define FT_LOCAL_DEF(x)
Definition: ftconfig.h:467
gxv_mort_subtable_type2_ligActionOffset_validate
static void gxv_mort_subtable_type2_ligActionOffset_validate(FT_Bytes table, FT_UShort ligActionOffset, GXV_Validator valid)
Definition: gxvmort2.c:137
p
GLfloat GLfloat p
Definition: glew.h:14938
GXV_32BIT_ALIGNMENT_VALIDATE
#define GXV_32BIT_ALIGNMENT_VALIDATE(a)
Definition: gxvcommn.h:317
limit
GLint limit
Definition: glew.h:11829
FT_Bytes
const FT_Byte * FT_Bytes
Definition: fttypes.h:161
gxv_mort_subtable_type2_ligatureTable_validate
static void gxv_mort_subtable_type2_ligatureTable_validate(FT_Bytes table, GXV_Validator valid)
Definition: gxvmort2.c:244
FT_NEXT_USHORT
#define FT_NEXT_USHORT(buffer)
Definition: ftstream.h:233
l
GLdouble l
Definition: glew.h:8383
GXV_mort_subtable_type2_StateOptRecData
struct GXV_mort_subtable_type2_StateOptRec_ * GXV_mort_subtable_type2_StateOptRecData
FT_INVALID_OFFSET
#define FT_INVALID_OFFSET
Definition: ftvalid.h:129
offset
GLintptr offset
Definition: glew.h:1668
GXV_mort_subtable_type2_StateOptRec
struct GXV_mort_subtable_type2_StateOptRec_ GXV_mort_subtable_type2_StateOptRec
flags
GLenum GLsizei GLsizei GLsizei GLsizei GLbitfield flags
Definition: glew.h:2767
gxv_mort_subtable_type2_validate
gxv_mort_subtable_type2_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmort2.c:276
FT_FaceRec_::num_glyphs
FT_Long num_glyphs
Definition: freetype.h:920
gxv_set_length_by_ushort_offset
gxv_set_length_by_ushort_offset(FT_UShort *offset, FT_UShort **length, FT_UShort *buff, FT_UInt nmemb, FT_UShort limit, GXV_Validator valid)
Definition: gxvcommn.c:63
FT_NEXT_ULONG
#define FT_NEXT_ULONG(buffer)
Definition: ftstream.h:245
gxv_mort_subtable_type2_opttable_load
static void gxv_mort_subtable_type2_opttable_load(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmort2.c:58
FT_INVALID_GLYPH_ID
#define FT_INVALID_GLYPH_ID
Definition: ftvalid.h:137
gxv_mort_subtable_type2_subtable_setup
static void gxv_mort_subtable_type2_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)
Definition: gxvmort2.c:82
FT_UShort
unsigned short FT_UShort
Definition: fttypes.h:205
gxv_StateTable_validate
gxv_StateTable_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvcommn.c:1214
FT_UNUSED
#define FT_UNUSED(arg)
Definition: ftconfig.h:101
GXV_ValidatorRec_
Definition: gxvcommn.h:237
GXV_LIMIT_CHECK
#define GXV_LIMIT_CHECK(_count)
Definition: gxvcommn.h:272