Sync with trunk r47367
[reactos.git] / lib / 3rdparty / freetype / src / gxvalid / gxvmorx2.c
1 /***************************************************************************/
2 /* */
3 /* gxvmorx2.c */
4 /* */
5 /* TrueTypeGX/AAT morx 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 "gxvmorx.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_gxvmorx
39
40
41 typedef struct GXV_morx_subtable_type2_StateOptRec_
42 {
43 FT_ULong ligActionTable;
44 FT_ULong componentTable;
45 FT_ULong ligatureTable;
46 FT_ULong ligActionTable_length;
47 FT_ULong componentTable_length;
48 FT_ULong ligatureTable_length;
49
50 } GXV_morx_subtable_type2_StateOptRec,
51 *GXV_morx_subtable_type2_StateOptRecData;
52
53
54 #define GXV_MORX_SUBTABLE_TYPE2_HEADER_SIZE \
55 ( GXV_XSTATETABLE_HEADER_SIZE + 4 + 4 + 4 )
56
57
58 static void
59 gxv_morx_subtable_type2_opttable_load( FT_Bytes table,
60 FT_Bytes limit,
61 GXV_Validator valid )
62 {
63 FT_Bytes p = table;
64
65 GXV_morx_subtable_type2_StateOptRecData optdata =
66 (GXV_morx_subtable_type2_StateOptRecData)valid->xstatetable.optdata;
67
68
69 GXV_LIMIT_CHECK( 4 + 4 + 4 );
70 optdata->ligActionTable = FT_NEXT_ULONG( p );
71 optdata->componentTable = FT_NEXT_ULONG( p );
72 optdata->ligatureTable = FT_NEXT_ULONG( p );
73
74 GXV_TRACE(( "offset to ligActionTable=0x%08x\n",
75 optdata->ligActionTable ));
76 GXV_TRACE(( "offset to componentTable=0x%08x\n",
77 optdata->componentTable ));
78 GXV_TRACE(( "offset to ligatureTable=0x%08x\n",
79 optdata->ligatureTable ));
80 }
81
82
83 static void
84 gxv_morx_subtable_type2_subtable_setup( FT_ULong table_size,
85 FT_ULong classTable,
86 FT_ULong stateArray,
87 FT_ULong entryTable,
88 FT_ULong* classTable_length_p,
89 FT_ULong* stateArray_length_p,
90 FT_ULong* entryTable_length_p,
91 GXV_Validator valid )
92 {
93 FT_ULong o[6];
94 FT_ULong* l[6];
95 FT_ULong buff[7];
96
97 GXV_morx_subtable_type2_StateOptRecData optdata =
98 (GXV_morx_subtable_type2_StateOptRecData)valid->xstatetable.optdata;
99
100
101 GXV_NAME_ENTER( "subtable boundaries setup" );
102
103 o[0] = classTable;
104 o[1] = stateArray;
105 o[2] = entryTable;
106 o[3] = optdata->ligActionTable;
107 o[4] = optdata->componentTable;
108 o[5] = optdata->ligatureTable;
109 l[0] = classTable_length_p;
110 l[1] = stateArray_length_p;
111 l[2] = entryTable_length_p;
112 l[3] = &(optdata->ligActionTable_length);
113 l[4] = &(optdata->componentTable_length);
114 l[5] = &(optdata->ligatureTable_length);
115
116 gxv_set_length_by_ulong_offset( o, l, buff, 6, table_size, valid );
117
118 GXV_TRACE(( "classTable: offset=0x%08x length=0x%08x\n",
119 classTable, *classTable_length_p ));
120 GXV_TRACE(( "stateArray: offset=0x%08x length=0x%08x\n",
121 stateArray, *stateArray_length_p ));
122 GXV_TRACE(( "entryTable: offset=0x%08x length=0x%08x\n",
123 entryTable, *entryTable_length_p ));
124 GXV_TRACE(( "ligActionTable: offset=0x%08x length=0x%08x\n",
125 optdata->ligActionTable,
126 optdata->ligActionTable_length ));
127 GXV_TRACE(( "componentTable: offset=0x%08x length=0x%08x\n",
128 optdata->componentTable,
129 optdata->componentTable_length ));
130 GXV_TRACE(( "ligatureTable: offset=0x%08x length=0x%08x\n",
131 optdata->ligatureTable,
132 optdata->ligatureTable_length ));
133
134 GXV_EXIT;
135 }
136
137
138 #define GXV_MORX_LIGACTION_ENTRY_SIZE 4
139
140
141 static void
142 gxv_morx_subtable_type2_ligActionIndex_validate(
143 FT_Bytes table,
144 FT_UShort ligActionIndex,
145 GXV_Validator valid )
146 {
147 /* access ligActionTable */
148 GXV_morx_subtable_type2_StateOptRecData optdata =
149 (GXV_morx_subtable_type2_StateOptRecData)valid->xstatetable.optdata;
150
151 FT_Bytes lat_base = table + optdata->ligActionTable;
152 FT_Bytes p = lat_base +
153 ligActionIndex * GXV_MORX_LIGACTION_ENTRY_SIZE;
154 FT_Bytes lat_limit = lat_base + optdata->ligActionTable;
155
156
157 if ( p < lat_base )
158 {
159 GXV_TRACE(( "p < lat_base (%d byte rewind)\n", lat_base - p ));
160 FT_INVALID_OFFSET;
161 }
162 else if ( lat_limit < p )
163 {
164 GXV_TRACE(( "lat_limit < p (%d byte overrun)\n", p - lat_limit ));
165 FT_INVALID_OFFSET;
166 }
167
168 {
169 /* validate entry in ligActionTable */
170 FT_ULong lig_action;
171 FT_UShort last;
172 FT_UShort store;
173 FT_ULong offset;
174
175
176 lig_action = FT_NEXT_ULONG( p );
177 last = (FT_UShort)( ( lig_action >> 31 ) & 1 );
178 store = (FT_UShort)( ( lig_action >> 30 ) & 1 );
179
180 offset = lig_action & 0x3FFFFFFFUL;
181 }
182 }
183
184
185 static void
186 gxv_morx_subtable_type2_entry_validate(
187 FT_UShort state,
188 FT_UShort flags,
189 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,
190 FT_Bytes table,
191 FT_Bytes limit,
192 GXV_Validator valid )
193 {
194 FT_UShort setComponent;
195 FT_UShort dontAdvance;
196 FT_UShort performAction;
197 FT_UShort reserved;
198 FT_UShort ligActionIndex;
199
200 FT_UNUSED( state );
201 FT_UNUSED( limit );
202
203
204 setComponent = (FT_UShort)( ( flags >> 15 ) & 1 );
205 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
206 performAction = (FT_UShort)( ( flags >> 13 ) & 1 );
207
208 reserved = (FT_UShort)( flags & 0x1FFF );
209 ligActionIndex = glyphOffset_p->u;
210
211 if ( reserved > 0 )
212 GXV_TRACE(( " reserved 14bit is non-zero\n" ));
213
214 if ( 0 < ligActionIndex )
215 gxv_morx_subtable_type2_ligActionIndex_validate(
216 table, ligActionIndex, valid );
217 }
218
219
220 static void
221 gxv_morx_subtable_type2_ligatureTable_validate( FT_Bytes table,
222 GXV_Validator valid )
223 {
224 GXV_morx_subtable_type2_StateOptRecData optdata =
225 (GXV_morx_subtable_type2_StateOptRecData)valid->xstatetable.optdata;
226
227 FT_Bytes p = table + optdata->ligatureTable;
228 FT_Bytes limit = table + optdata->ligatureTable
229 + optdata->ligatureTable_length;
230
231
232 GXV_NAME_ENTER( "morx chain subtable type2 - substitutionTable" );
233
234 if ( 0 != optdata->ligatureTable )
235 {
236 /* Apple does not give specification of ligatureTable format */
237 while ( p < limit )
238 {
239 FT_UShort lig_gid;
240
241
242 GXV_LIMIT_CHECK( 2 );
243 lig_gid = FT_NEXT_USHORT( p );
244 }
245 }
246
247 GXV_EXIT;
248 }
249
250
251 FT_LOCAL_DEF( void )
252 gxv_morx_subtable_type2_validate( FT_Bytes table,
253 FT_Bytes limit,
254 GXV_Validator valid )
255 {
256 FT_Bytes p = table;
257
258 GXV_morx_subtable_type2_StateOptRec lig_rec;
259
260
261 GXV_NAME_ENTER( "morx chain subtable type2 (Ligature Substitution)" );
262
263 GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE2_HEADER_SIZE );
264
265 valid->xstatetable.optdata =
266 &lig_rec;
267 valid->xstatetable.optdata_load_func =
268 gxv_morx_subtable_type2_opttable_load;
269 valid->xstatetable.subtable_setup_func =
270 gxv_morx_subtable_type2_subtable_setup;
271 valid->xstatetable.entry_glyphoffset_fmt =
272 GXV_GLYPHOFFSET_USHORT;
273 valid->xstatetable.entry_validate_func =
274 gxv_morx_subtable_type2_entry_validate;
275
276 gxv_XStateTable_validate( p, limit, valid );
277
278 p += valid->subtable_length;
279 gxv_morx_subtable_type2_ligatureTable_validate( table, valid );
280
281 GXV_EXIT;
282 }
283
284
285 /* END */