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[reactos.git] / lib / 3rdparty / freetype / src / gxvalid / gxvmorx.c
1 /***************************************************************************/
2 /* */
3 /* gxvmorx.c */
4 /* */
5 /* TrueTypeGX/AAT morx table validation (body). */
6 /* */
7 /* Copyright 2005, 2008 by */
8 /* 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 static void
42 gxv_morx_subtables_validate( FT_Bytes table,
43 FT_Bytes limit,
44 FT_UShort nSubtables,
45 GXV_Validator valid )
46 {
47 FT_Bytes p = table;
48
49 GXV_Validate_Func fmt_funcs_table[] =
50 {
51 gxv_morx_subtable_type0_validate, /* 0 */
52 gxv_morx_subtable_type1_validate, /* 1 */
53 gxv_morx_subtable_type2_validate, /* 2 */
54 NULL, /* 3 */
55 gxv_morx_subtable_type4_validate, /* 4 */
56 gxv_morx_subtable_type5_validate, /* 5 */
57
58 };
59
60 GXV_Validate_Func func;
61
62 FT_UShort i;
63
64
65 GXV_NAME_ENTER( "subtables in a chain" );
66
67 for ( i = 0; i < nSubtables; i++ )
68 {
69 FT_ULong length;
70 FT_ULong coverage;
71 FT_ULong subFeatureFlags;
72 FT_ULong type;
73 FT_ULong rest;
74
75
76 GXV_LIMIT_CHECK( 4 + 4 + 4 );
77 length = FT_NEXT_ULONG( p );
78 coverage = FT_NEXT_ULONG( p );
79 subFeatureFlags = FT_NEXT_ULONG( p );
80
81 GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",
82 i + 1, nSubtables, length ));
83
84 type = coverage & 0x0007;
85 rest = length - ( 4 + 4 + 4 );
86 GXV_LIMIT_CHECK( rest );
87
88 /* morx coverage consists of mort_coverage & 16bit padding */
89 gxv_mort_coverage_validate( (FT_UShort)( ( coverage >> 16 ) | coverage ),
90 valid );
91 if ( type > 5 )
92 FT_INVALID_FORMAT;
93
94 func = fmt_funcs_table[type];
95 if ( func == NULL )
96 GXV_TRACE(( "morx type %d is reserved\n", type ));
97
98 func( p, p + rest, valid );
99
100 p += rest;
101 }
102
103 valid->subtable_length = p - table;
104
105 GXV_EXIT;
106 }
107
108
109 static void
110 gxv_morx_chain_validate( FT_Bytes table,
111 FT_Bytes limit,
112 GXV_Validator valid )
113 {
114 FT_Bytes p = table;
115 FT_ULong defaultFlags;
116 FT_ULong chainLength;
117 FT_ULong nFeatureFlags;
118 FT_ULong nSubtables;
119
120
121 GXV_NAME_ENTER( "morx chain header" );
122
123 GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );
124 defaultFlags = FT_NEXT_ULONG( p );
125 chainLength = FT_NEXT_ULONG( p );
126 nFeatureFlags = FT_NEXT_ULONG( p );
127 nSubtables = FT_NEXT_ULONG( p );
128
129 /* feature-array of morx is same with that of mort */
130 gxv_mort_featurearray_validate( p, limit, nFeatureFlags, valid );
131 p += valid->subtable_length;
132
133 if ( nSubtables >= 0x10000L )
134 FT_INVALID_DATA;
135
136 gxv_morx_subtables_validate( p, table + chainLength,
137 (FT_UShort)nSubtables, valid );
138
139 valid->subtable_length = chainLength;
140
141 GXV_EXIT;
142 }
143
144
145 FT_LOCAL_DEF( void )
146 gxv_morx_validate( FT_Bytes table,
147 FT_Face face,
148 FT_Validator ftvalid )
149 {
150 GXV_ValidatorRec validrec;
151 GXV_Validator valid = &validrec;
152 FT_Bytes p = table;
153 FT_Bytes limit = 0;
154 FT_ULong version;
155 FT_ULong nChains;
156 FT_ULong i;
157
158
159 valid->root = ftvalid;
160 valid->face = face;
161
162 FT_TRACE3(( "validating `morx' table\n" ));
163 GXV_INIT;
164
165 GXV_LIMIT_CHECK( 4 + 4 );
166 version = FT_NEXT_ULONG( p );
167 nChains = FT_NEXT_ULONG( p );
168
169 if ( version != 0x00020000UL )
170 FT_INVALID_FORMAT;
171
172 for ( i = 0; i < nChains; i++ )
173 {
174 GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains ));
175 GXV_32BIT_ALIGNMENT_VALIDATE( p - table );
176 gxv_morx_chain_validate( p, limit, valid );
177 p += valid->subtable_length;
178 }
179
180 FT_TRACE4(( "\n" ));
181 }
182
183
184 /* END */