e1c162fa0c6de7b70adcfa35108785bf89ca8d1b
[reactos.git] / lib / 3rdparty / freetype / src / gxvalid / gxvmorx1.c
1 /***************************************************************************/
2 /* */
3 /* gxvmorx1.c */
4 /* */
5 /* TrueTypeGX/AAT morx table validation */
6 /* body for type1 (Contextual Substitution) subtable. */
7 /* */
8 /* Copyright 2005, 2007 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_type1_StateOptRec_
42 {
43 FT_ULong substitutionTable;
44 FT_ULong substitutionTable_length;
45 FT_UShort substitutionTable_num_lookupTables;
46
47 } GXV_morx_subtable_type1_StateOptRec,
48 *GXV_morx_subtable_type1_StateOptRecData;
49
50
51 #define GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE \
52 ( GXV_STATETABLE_HEADER_SIZE + 2 )
53
54
55 static void
56 gxv_morx_subtable_type1_substitutionTable_load( FT_Bytes table,
57 FT_Bytes limit,
58 GXV_Validator valid )
59 {
60 FT_Bytes p = table;
61
62 GXV_morx_subtable_type1_StateOptRecData optdata =
63 (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata;
64
65
66 GXV_LIMIT_CHECK( 2 );
67 optdata->substitutionTable = FT_NEXT_USHORT( p );
68 }
69
70
71 static void
72 gxv_morx_subtable_type1_subtable_setup( FT_ULong table_size,
73 FT_ULong classTable,
74 FT_ULong stateArray,
75 FT_ULong entryTable,
76 FT_ULong* classTable_length_p,
77 FT_ULong* stateArray_length_p,
78 FT_ULong* entryTable_length_p,
79 GXV_Validator valid )
80 {
81 FT_ULong o[4];
82 FT_ULong *l[4];
83 FT_ULong buff[5];
84
85 GXV_morx_subtable_type1_StateOptRecData optdata =
86 (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata;
87
88
89 o[0] = classTable;
90 o[1] = stateArray;
91 o[2] = entryTable;
92 o[3] = optdata->substitutionTable;
93 l[0] = classTable_length_p;
94 l[1] = stateArray_length_p;
95 l[2] = entryTable_length_p;
96 l[3] = &(optdata->substitutionTable_length);
97
98 gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid );
99 }
100
101
102 static void
103 gxv_morx_subtable_type1_entry_validate(
104 FT_UShort state,
105 FT_UShort flags,
106 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,
107 FT_Bytes table,
108 FT_Bytes limit,
109 GXV_Validator valid )
110 {
111 FT_UShort setMark;
112 FT_UShort dontAdvance;
113 FT_UShort reserved;
114 FT_Short markIndex;
115 FT_Short currentIndex;
116
117 GXV_morx_subtable_type1_StateOptRecData optdata =
118 (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata;
119
120 FT_UNUSED( state );
121 FT_UNUSED( table );
122 FT_UNUSED( limit );
123
124
125 setMark = (FT_UShort)( ( flags >> 15 ) & 1 );
126 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
127
128 reserved = (FT_UShort)( flags & 0x3FFF );
129
130 markIndex = (FT_Short)( glyphOffset_p->ul >> 16 );
131 currentIndex = (FT_Short)( glyphOffset_p->ul );
132
133 GXV_TRACE(( " setMark=%01d dontAdvance=%01d\n",
134 setMark, dontAdvance ));
135
136 if ( 0 < reserved )
137 {
138 GXV_TRACE(( " non-zero bits found in reserved range\n" ));
139 if ( valid->root->level >= FT_VALIDATE_PARANOID )
140 FT_INVALID_DATA;
141 }
142
143 GXV_TRACE(( "markIndex = %d, currentIndex = %d\n",
144 markIndex, currentIndex ));
145
146 if ( optdata->substitutionTable_num_lookupTables < markIndex + 1 )
147 optdata->substitutionTable_num_lookupTables =
148 (FT_Short)( markIndex + 1 );
149
150 if ( optdata->substitutionTable_num_lookupTables < currentIndex + 1 )
151 optdata->substitutionTable_num_lookupTables =
152 (FT_Short)( currentIndex + 1 );
153 }
154
155
156 static void
157 gxv_morx_subtable_type1_LookupValue_validate( FT_UShort glyph,
158 GXV_LookupValueCPtr value_p,
159 GXV_Validator valid )
160 {
161 FT_UNUSED( glyph ); /* for the non-debugging case */
162
163 GXV_TRACE(( "morx subtable type1 subst.: %d -> %d\n", glyph, value_p->u ));
164
165 if ( value_p->u > valid->face->num_glyphs )
166 FT_INVALID_GLYPH_ID;
167 }
168
169
170 static GXV_LookupValueDesc
171 gxv_morx_subtable_type1_LookupFmt4_transit(
172 FT_UShort relative_gindex,
173 GXV_LookupValueCPtr base_value_p,
174 FT_Bytes lookuptbl_limit,
175 GXV_Validator valid )
176 {
177 FT_Bytes p;
178 FT_Bytes limit;
179 FT_UShort offset;
180 GXV_LookupValueDesc value;
181
182 /* XXX: check range? */
183 offset = (FT_UShort)( base_value_p->u +
184 relative_gindex * sizeof ( FT_UShort ) );
185
186 p = valid->lookuptbl_head + offset;
187 limit = lookuptbl_limit;
188
189 GXV_LIMIT_CHECK ( 2 );
190 value.u = FT_NEXT_USHORT( p );
191
192 return value;
193 }
194
195
196 /*
197 * TODO: length should be limit?
198 **/
199 static void
200 gxv_morx_subtable_type1_substitutionTable_validate( FT_Bytes table,
201 FT_Bytes limit,
202 GXV_Validator valid )
203 {
204 FT_Bytes p = table;
205 FT_UShort i;
206
207 GXV_morx_subtable_type1_StateOptRecData optdata =
208 (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata;
209
210
211 /* TODO: calculate offset/length for each lookupTables */
212 valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
213 valid->lookupval_func = gxv_morx_subtable_type1_LookupValue_validate;
214 valid->lookupfmt4_trans = gxv_morx_subtable_type1_LookupFmt4_transit;
215
216 for ( i = 0; i < optdata->substitutionTable_num_lookupTables; i++ )
217 {
218 FT_ULong offset;
219
220
221 GXV_LIMIT_CHECK( 4 );
222 offset = FT_NEXT_ULONG( p );
223
224 gxv_LookupTable_validate( table + offset, limit, valid );
225 }
226
227 /* TODO: overlapping of lookupTables in substitutionTable */
228 }
229
230
231 /*
232 * subtable for Contextual glyph substitution is a modified StateTable.
233 * In addition to classTable, stateArray, entryTable, the field
234 * `substitutionTable' is added.
235 */
236 FT_LOCAL_DEF( void )
237 gxv_morx_subtable_type1_validate( FT_Bytes table,
238 FT_Bytes limit,
239 GXV_Validator valid )
240 {
241 FT_Bytes p = table;
242
243 GXV_morx_subtable_type1_StateOptRec st_rec;
244
245
246 GXV_NAME_ENTER( "morx chain subtable type1 (Contextual Glyph Subst)" );
247
248 GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE );
249
250 st_rec.substitutionTable_num_lookupTables = 0;
251
252 valid->xstatetable.optdata =
253 &st_rec;
254 valid->xstatetable.optdata_load_func =
255 gxv_morx_subtable_type1_substitutionTable_load;
256 valid->xstatetable.subtable_setup_func =
257 gxv_morx_subtable_type1_subtable_setup;
258 valid->xstatetable.entry_glyphoffset_fmt =
259 GXV_GLYPHOFFSET_ULONG;
260 valid->xstatetable.entry_validate_func =
261 gxv_morx_subtable_type1_entry_validate;
262
263 gxv_XStateTable_validate( p, limit, valid );
264
265 gxv_morx_subtable_type1_substitutionTable_validate(
266 table + st_rec.substitutionTable,
267 table + st_rec.substitutionTable + st_rec.substitutionTable_length,
268 valid );
269
270 GXV_EXIT;
271 }
272
273
274 /* END */