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
|
/***************************************************************************/
/* */
/* gxvopbd.c */
/* */
/* TrueTypeGX/AAT opbd table validation (body). */
/* */
/* Copyright 2004, 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 is supported by the Information-technology */
/* Promotion Agency(IPA), Japan. */
/* */
/***************************************************************************/
#include "gxvalid.h"
#include "gxvcommn.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_gxvopbd
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** Data and Types *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct GXV_opbd_DataRec_
{
FT_UShort format;
FT_UShort valueOffset_min;
} GXV_opbd_DataRec, *GXV_opbd_Data;
#define GXV_OPBD_DATA( FIELD ) GXV_TABLE_DATA( opbd, FIELD )
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** UTILITY FUNCTIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
gxv_opbd_LookupValue_validate( FT_UShort glyph,
GXV_LookupValueCPtr value_p,
GXV_Validator gxvalid )
{
/* offset in LookupTable is measured from the head of opbd table */
FT_Bytes p = gxvalid->root->base + value_p->u;
FT_Bytes limit = gxvalid->root->limit;
FT_Short delta_value;
int i;
if ( value_p->u < GXV_OPBD_DATA( valueOffset_min ) )
GXV_OPBD_DATA( valueOffset_min ) = value_p->u;
for ( i = 0; i < 4; i++ )
{
GXV_LIMIT_CHECK( 2 );
delta_value = FT_NEXT_SHORT( p );
if ( GXV_OPBD_DATA( format ) ) /* format 1, value is ctrl pt. */
{
if ( delta_value == -1 )
continue;
gxv_ctlPoint_validate( glyph, delta_value, gxvalid );
}
else /* format 0, value is distance */
continue;
}
}
/*
opbd ---------------------+
|
+===============+ |
| lookup header | |
+===============+ |
| BinSrchHeader | |
+===============+ |
| lastGlyph[0] | |
+---------------+ |
| firstGlyph[0] | | head of opbd sfnt table
+---------------+ | +
| offset[0] | -> | offset [byte]
+===============+ | +
| lastGlyph[1] | | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte]
+---------------+ |
| firstGlyph[1] | |
+---------------+ |
| offset[1] | |
+===============+ |
|
.... |
|
48bit value array |
+===============+ |
| value | <-------+
| |
| |
| |
+---------------+
.... */
static GXV_LookupValueDesc
gxv_opbd_LookupFmt4_transit( FT_UShort relative_gindex,
GXV_LookupValueCPtr base_value_p,
FT_Bytes lookuptbl_limit,
GXV_Validator gxvalid )
{
GXV_LookupValueDesc value;
FT_UNUSED( lookuptbl_limit );
FT_UNUSED( gxvalid );
/* XXX: check range? */
value.u = (FT_UShort)( base_value_p->u +
relative_gindex * 4 * sizeof ( FT_Short ) );
return value;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** opbd TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
gxv_opbd_validate( FT_Bytes table,
FT_Face face,
FT_Validator ftvalid )
{
GXV_ValidatorRec gxvalidrec;
GXV_Validator gxvalid = &gxvalidrec;
GXV_opbd_DataRec opbdrec;
GXV_opbd_Data opbd = &opbdrec;
FT_Bytes p = table;
FT_Bytes limit = 0;
FT_ULong version;
gxvalid->root = ftvalid;
gxvalid->table_data = opbd;
gxvalid->face = face;
FT_TRACE3(( "validating `opbd' table\n" ));
GXV_INIT;
GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU;
GXV_LIMIT_CHECK( 4 + 2 );
version = FT_NEXT_ULONG( p );
GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p );
/* only 0x00010000 is defined (1996) */
GXV_TRACE(( "(version=0x%08x)\n", version ));
if ( 0x00010000UL != version )
FT_INVALID_FORMAT;
/* only values 0 and 1 are defined (1996) */
GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) ));
if ( 0x0001 < GXV_OPBD_DATA( format ) )
FT_INVALID_FORMAT;
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
gxvalid->lookupval_func = gxv_opbd_LookupValue_validate;
gxvalid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit;
gxv_LookupTable_validate( p, limit, gxvalid );
p += gxvalid->subtable_length;
if ( p > table + GXV_OPBD_DATA( valueOffset_min ) )
{
GXV_TRACE((
"found overlap between LookupTable and opbd_value array\n" ));
FT_INVALID_OFFSET;
}
FT_TRACE4(( "\n" ));
}
/* END */
|
