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
|
/***************************************************************************/
/* */
/* gxvmorx1.c */
/* */
/* TrueTypeGX/AAT morx table validation */
/* body for type1 (Contextual Substitution) subtable. */
/* */
/* Copyright 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 was support of Information-technology Promotion */
/* Agency(IPA), Japan. */
/***************************************************************************/
#include "gxvmorx.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_gxvmorx
typedef struct GXV_morx_subtable_type1_StateOptRec_
{
FT_ULong substitutionTable;
FT_ULong substitutionTable_length;
FT_UShort substitutionTable_num_lookupTables;
} GXV_morx_subtable_type1_StateOptRec,
*GXV_morx_subtable_type1_StateOptRecData;
#define GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE ( GXV_STATETABLE_HEADER_SIZE + 2 )
static void
gxv_morx_subtable_type1_substitutionTable_load( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
GXV_morx_subtable_type1_StateOptRecData optdata = valid->xstatetable.optdata;
GXV_LIMIT_CHECK( 2 );
optdata->substitutionTable = FT_NEXT_USHORT( p );
}
static void
gxv_morx_subtable_type1_subtable_setup( FT_ULong table_size,
FT_ULong classTable,
FT_ULong stateArray,
FT_ULong entryTable,
FT_ULong* classTable_length_p,
FT_ULong* stateArray_length_p,
FT_ULong* entryTable_length_p,
GXV_Validator valid )
{
FT_ULong o[4];
FT_ULong *l[4];
FT_ULong buff[5];
GXV_morx_subtable_type1_StateOptRecData optdata = valid->xstatetable.optdata;
o[0] = classTable;
o[1] = stateArray;
o[2] = entryTable;
o[3] = optdata->substitutionTable;
l[0] = classTable_length_p;
l[1] = stateArray_length_p;
l[2] = entryTable_length_p;
l[3] = &(optdata->substitutionTable_length);
gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid );
}
static void
gxv_morx_subtable_type1_entry_validate( FT_UShort state,
FT_UShort flags,
GXV_StateTable_GlyphOffsetDesc
glyphOffset,
FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_UShort setMark;
FT_UShort dontAdvance;
FT_UShort reserved;
FT_Short markIndex;
FT_Short currentIndex;
GXV_morx_subtable_type1_StateOptRecData optdata = valid->xstatetable.optdata;
setMark = flags / 0x8000;
dontAdvance = ( flags & 0x4000 ) / 0x4000;
reserved = flags & 0x3FFF;
markIndex = GXV_USHORT_TO_SHORT( glyphOffset.ul / 0x00010000 );
currentIndex = GXV_USHORT_TO_SHORT( glyphOffset.ul & 0x0000FFFF );
GXV_TRACE(( " setMark=%01d dontAdvance=%01d\n",
setMark, dontAdvance ));
if ( 0 < reserved )
{
GXV_TRACE(( " non-zero bits found in reserved range\n" ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_DATA;
}
GXV_TRACE(( "markIndex = %d, currentIndex = %d\n", markIndex, currentIndex ));
if ( optdata->substitutionTable_num_lookupTables < markIndex + 1 )
optdata->substitutionTable_num_lookupTables = markIndex + 1;
if ( optdata->substitutionTable_num_lookupTables < currentIndex + 1 )
optdata->substitutionTable_num_lookupTables = currentIndex + 1;
}
static void
gxv_morx_subtable_type1_LookupValue_validate( FT_UShort glyph,
GXV_LookupValueDesc value,
GXV_Validator valid )
{
GXV_TRACE(( "morx subtable type1 subst.: %d -> %d\n", glyph, value.u ));
if ( value.u > valid->face->num_glyphs )
FT_INVALID_GLYPH_ID;
}
static GXV_LookupValueDesc
gxv_morx_subtable_type1_LookupFmt4_transit( FT_UShort relative_gindex,
GXV_LookupValueDesc base_value,
FT_Bytes lookuptbl_limit,
GXV_Validator valid )
{
FT_Bytes p;
FT_Bytes limit;
FT_UShort offset;
GXV_LookupValueDesc value;
offset = base_value.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;
}
/*
* TODO: length should be limit?
**/
static void
gxv_morx_subtable_type1_substitutionTable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
GXV_morx_subtable_type1_StateOptRecData optdata = valid->xstatetable.optdata;
FT_UShort i;
/* TODO: calculate offset/length for each lookupTables */
valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
valid->lookupval_func = gxv_morx_subtable_type1_LookupValue_validate;
valid->lookupfmt4_trans = gxv_morx_subtable_type1_LookupFmt4_transit;
for ( i = 0; i < optdata->substitutionTable_num_lookupTables; i++ )
{
FT_ULong offset;
GXV_LIMIT_CHECK( 4 );
offset = FT_NEXT_ULONG( p );
gxv_LookupTable_validate( table + offset, limit, valid );
}
/* TODO: overlapping of lookupTables in substitutionTable */
}
/*
* subtable for Contextual glyph substition is modified StateTable.
* In addition classTable, stateArray, entryTable, "substitutionTable"
* is added.
*/
static void
gxv_morx_subtable_type1_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
GXV_morx_subtable_type1_StateOptRec st_rec;
GXV_NAME_ENTER( "morx chain subtable type1 (Contextual Glyph Subst)" );
GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE );
st_rec.substitutionTable_num_lookupTables = 0;
valid->xstatetable.optdata = &st_rec;
valid->xstatetable.optdata_load_func = gxv_morx_subtable_type1_substitutionTable_load;
valid->xstatetable.subtable_setup_func = gxv_morx_subtable_type1_subtable_setup;
valid->xstatetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_ULONG;
valid->xstatetable.entry_validate_func = gxv_morx_subtable_type1_entry_validate;
gxv_XStateTable_validate( p, limit, valid );
gxv_morx_subtable_type1_substitutionTable_validate( table
+ st_rec.substitutionTable,
table
+ st_rec.substitutionTable
+ st_rec.substitutionTable_length,
valid );
GXV_EXIT;
}
/* END */
|
