Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /***************************************************************************/ |
| 2 | /* */ |
||
| 3 | /* gxvmorx.c */ |
||
| 4 | /* */ |
||
| 5 | /* TrueTypeGX/AAT morx table validation (body). */ |
||
| 6 | /* */ |
||
| 7 | /* Copyright 2005, 2008, 2013 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 | FT_UShort i; |
||
| 61 | |||
| 62 | |||
| 63 | GXV_NAME_ENTER( "subtables in a chain" ); |
||
| 64 | |||
| 65 | for ( i = 0; i < nSubtables; i++ ) |
||
| 66 | { |
||
| 67 | GXV_Validate_Func func; |
||
| 68 | |||
| 69 | FT_ULong length; |
||
| 70 | FT_ULong coverage; |
||
| 71 | #ifdef GXV_LOAD_UNUSED_VARS |
||
| 72 | FT_ULong subFeatureFlags; |
||
| 73 | #endif |
||
| 74 | FT_ULong type; |
||
| 75 | FT_ULong rest; |
||
| 76 | |||
| 77 | |||
| 78 | GXV_LIMIT_CHECK( 4 + 4 + 4 ); |
||
| 79 | length = FT_NEXT_ULONG( p ); |
||
| 80 | coverage = FT_NEXT_ULONG( p ); |
||
| 81 | #ifdef GXV_LOAD_UNUSED_VARS |
||
| 82 | subFeatureFlags = FT_NEXT_ULONG( p ); |
||
| 83 | #else |
||
| 84 | p += 4; |
||
| 85 | #endif |
||
| 86 | |||
| 87 | GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n", |
||
| 88 | i + 1, nSubtables, length )); |
||
| 89 | |||
| 90 | type = coverage & 0x0007; |
||
| 91 | rest = length - ( 4 + 4 + 4 ); |
||
| 92 | GXV_LIMIT_CHECK( rest ); |
||
| 93 | |||
| 94 | /* morx coverage consists of mort_coverage & 16bit padding */ |
||
| 95 | gxv_mort_coverage_validate( (FT_UShort)( ( coverage >> 16 ) | coverage ), |
||
| 96 | valid ); |
||
| 97 | if ( type > 5 ) |
||
| 98 | FT_INVALID_FORMAT; |
||
| 99 | |||
| 100 | func = fmt_funcs_table[type]; |
||
| 101 | if ( func == NULL ) |
||
| 102 | GXV_TRACE(( "morx type %d is reserved\n", type )); |
||
| 103 | |||
| 104 | func( p, p + rest, valid ); |
||
| 105 | |||
| 106 | /* TODO: subFeatureFlags should be unique in a table? */ |
||
| 107 | p += rest; |
||
| 108 | } |
||
| 109 | |||
| 110 | valid->subtable_length = p - table; |
||
| 111 | |||
| 112 | GXV_EXIT; |
||
| 113 | } |
||
| 114 | |||
| 115 | |||
| 116 | static void |
||
| 117 | gxv_morx_chain_validate( FT_Bytes table, |
||
| 118 | FT_Bytes limit, |
||
| 119 | GXV_Validator valid ) |
||
| 120 | { |
||
| 121 | FT_Bytes p = table; |
||
| 122 | #ifdef GXV_LOAD_UNUSED_VARS |
||
| 123 | FT_ULong defaultFlags; |
||
| 124 | #endif |
||
| 125 | FT_ULong chainLength; |
||
| 126 | FT_ULong nFeatureFlags; |
||
| 127 | FT_ULong nSubtables; |
||
| 128 | |||
| 129 | |||
| 130 | GXV_NAME_ENTER( "morx chain header" ); |
||
| 131 | |||
| 132 | GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 ); |
||
| 133 | #ifdef GXV_LOAD_UNUSED_VARS |
||
| 134 | defaultFlags = FT_NEXT_ULONG( p ); |
||
| 135 | #else |
||
| 136 | p += 4; |
||
| 137 | #endif |
||
| 138 | chainLength = FT_NEXT_ULONG( p ); |
||
| 139 | nFeatureFlags = FT_NEXT_ULONG( p ); |
||
| 140 | nSubtables = FT_NEXT_ULONG( p ); |
||
| 141 | |||
| 142 | /* feature-array of morx is same with that of mort */ |
||
| 143 | gxv_mort_featurearray_validate( p, limit, nFeatureFlags, valid ); |
||
| 144 | p += valid->subtable_length; |
||
| 145 | |||
| 146 | if ( nSubtables >= 0x10000L ) |
||
| 147 | FT_INVALID_DATA; |
||
| 148 | |||
| 149 | gxv_morx_subtables_validate( p, table + chainLength, |
||
| 150 | (FT_UShort)nSubtables, valid ); |
||
| 151 | |||
| 152 | valid->subtable_length = chainLength; |
||
| 153 | |||
| 154 | /* TODO: defaultFlags should be compared with the flags in tables */ |
||
| 155 | |||
| 156 | GXV_EXIT; |
||
| 157 | } |
||
| 158 | |||
| 159 | |||
| 160 | FT_LOCAL_DEF( void ) |
||
| 161 | gxv_morx_validate( FT_Bytes table, |
||
| 162 | FT_Face face, |
||
| 163 | FT_Validator ftvalid ) |
||
| 164 | { |
||
| 165 | GXV_ValidatorRec validrec; |
||
| 166 | GXV_Validator valid = &validrec; |
||
| 167 | FT_Bytes p = table; |
||
| 168 | FT_Bytes limit = 0; |
||
| 169 | FT_ULong version; |
||
| 170 | FT_ULong nChains; |
||
| 171 | FT_ULong i; |
||
| 172 | |||
| 173 | |||
| 174 | valid->root = ftvalid; |
||
| 175 | valid->face = face; |
||
| 176 | |||
| 177 | FT_TRACE3(( "validating `morx' table\n" )); |
||
| 178 | GXV_INIT; |
||
| 179 | |||
| 180 | GXV_LIMIT_CHECK( 4 + 4 ); |
||
| 181 | version = FT_NEXT_ULONG( p ); |
||
| 182 | nChains = FT_NEXT_ULONG( p ); |
||
| 183 | |||
| 184 | if ( version != 0x00020000UL ) |
||
| 185 | FT_INVALID_FORMAT; |
||
| 186 | |||
| 187 | for ( i = 0; i < nChains; i++ ) |
||
| 188 | { |
||
| 189 | GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains )); |
||
| 190 | GXV_32BIT_ALIGNMENT_VALIDATE( p - table ); |
||
| 191 | gxv_morx_chain_validate( p, limit, valid ); |
||
| 192 | p += valid->subtable_length; |
||
| 193 | } |
||
| 194 | |||
| 195 | FT_TRACE4(( "\n" )); |
||
| 196 | } |
||
| 197 | |||
| 198 | |||
| 199 | /* END */ |