/src/freetype/src/gxvalid/gxvmort.c
C | 296 lines | 196 code | 62 blank | 38 comment | 18 complexity | 69011460b18cd064a3b0be7590053c54 MD5 | raw file
1/***************************************************************************/ 2/* */ 3/* gxvmort.c */ 4/* */ 5/* TrueTypeGX/AAT mort table validation (body). */ 6/* */ 7/* Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ 8/* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9/* */ 10/* This file is part of the FreeType project, and may only be used, */ 11/* modified, and distributed under the terms of the FreeType project */ 12/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13/* this file you indicate that you have read the license and */ 14/* understand and accept it fully. */ 15/* */ 16/***************************************************************************/ 17 18/***************************************************************************/ 19/* */ 20/* gxvalid is derived from both gxlayout module and otvalid module. */ 21/* Development of gxlayout is supported by the Information-technology */ 22/* Promotion Agency(IPA), Japan. */ 23/* */ 24/***************************************************************************/ 25 26 27#include "gxvmort.h" 28#include "gxvfeat.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_gxvmort 39 40 41 static void 42 gxv_mort_feature_validate( GXV_mort_feature f, 43 GXV_Validator valid ) 44 { 45 if ( f->featureType >= gxv_feat_registry_length ) 46 { 47 GXV_TRACE(( "featureType %d is out of registered range, " 48 "setting %d is unchecked\n", 49 f->featureType, f->featureSetting )); 50 GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); 51 } 52 else if ( !gxv_feat_registry[f->featureType].existence ) 53 { 54 GXV_TRACE(( "featureType %d is within registered area " 55 "but undefined, setting %d is unchecked\n", 56 f->featureType, f->featureSetting )); 57 GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); 58 } 59 else 60 { 61 FT_Byte nSettings_max; 62 63 64 /* nSettings in gxvfeat.c is halved for exclusive on/off settings */ 65 nSettings_max = gxv_feat_registry[f->featureType].nSettings; 66 if ( gxv_feat_registry[f->featureType].exclusive ) 67 nSettings_max = (FT_Byte)( 2 * nSettings_max ); 68 69 GXV_TRACE(( "featureType %d is registered", f->featureType )); 70 GXV_TRACE(( "setting %d", f->featureSetting )); 71 72 if ( f->featureSetting > nSettings_max ) 73 { 74 GXV_TRACE(( "out of defined range %d", nSettings_max )); 75 GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); 76 } 77 GXV_TRACE(( "\n" )); 78 } 79 80 /* TODO: enableFlags must be unique value in specified chain? */ 81 } 82 83 84 /* 85 * nFeatureFlags is typed to FT_ULong to accept that in 86 * mort (typed FT_UShort) and morx (typed FT_ULong). 87 */ 88 FT_LOCAL_DEF( void ) 89 gxv_mort_featurearray_validate( FT_Bytes table, 90 FT_Bytes limit, 91 FT_ULong nFeatureFlags, 92 GXV_Validator valid ) 93 { 94 FT_Bytes p = table; 95 FT_ULong i; 96 97 GXV_mort_featureRec f = GXV_MORT_FEATURE_OFF; 98 99 100 GXV_NAME_ENTER( "mort feature list" ); 101 for ( i = 0; i < nFeatureFlags; i++ ) 102 { 103 GXV_LIMIT_CHECK( 2 + 2 + 4 + 4 ); 104 f.featureType = FT_NEXT_USHORT( p ); 105 f.featureSetting = FT_NEXT_USHORT( p ); 106 f.enableFlags = FT_NEXT_ULONG( p ); 107 f.disableFlags = FT_NEXT_ULONG( p ); 108 109 gxv_mort_feature_validate( &f, valid ); 110 } 111 112 if ( !IS_GXV_MORT_FEATURE_OFF( f ) ) 113 FT_INVALID_DATA; 114 115 valid->subtable_length = p - table; 116 GXV_EXIT; 117 } 118 119 120 FT_LOCAL_DEF( void ) 121 gxv_mort_coverage_validate( FT_UShort coverage, 122 GXV_Validator valid ) 123 { 124 FT_UNUSED( valid ); 125 126 if ( coverage & 0x8000U ) 127 GXV_TRACE(( " this subtable is for vertical text only\n" )); 128 else 129 GXV_TRACE(( " this subtable is for horizontal text only\n" )); 130 131 if ( coverage & 0x4000 ) 132 GXV_TRACE(( " this subtable is applied to glyph array " 133 "in descending order\n" )); 134 else 135 GXV_TRACE(( " this subtable is applied to glyph array " 136 "in ascending order\n" )); 137 138 if ( coverage & 0x2000 ) 139 GXV_TRACE(( " this subtable is forcibly applied to " 140 "vertical/horizontal text\n" )); 141 142 if ( coverage & 0x1FF8 ) 143 GXV_TRACE(( " coverage has non-zero bits in reserved area\n" )); 144 } 145 146 147 static void 148 gxv_mort_subtables_validate( FT_Bytes table, 149 FT_Bytes limit, 150 FT_UShort nSubtables, 151 GXV_Validator valid ) 152 { 153 FT_Bytes p = table; 154 155 GXV_Validate_Func fmt_funcs_table[] = 156 { 157 gxv_mort_subtable_type0_validate, /* 0 */ 158 gxv_mort_subtable_type1_validate, /* 1 */ 159 gxv_mort_subtable_type2_validate, /* 2 */ 160 NULL, /* 3 */ 161 gxv_mort_subtable_type4_validate, /* 4 */ 162 gxv_mort_subtable_type5_validate, /* 5 */ 163 164 }; 165 166 GXV_Validate_Func func; 167 FT_UShort i; 168 169 170 GXV_NAME_ENTER( "subtables in a chain" ); 171 172 for ( i = 0; i < nSubtables; i++ ) 173 { 174 FT_UShort length; 175 FT_UShort coverage; 176#ifdef GXV_LOAD_UNUSED_VARS 177 FT_ULong subFeatureFlags; 178#endif 179 FT_UInt type; 180 FT_UInt rest; 181 182 183 GXV_LIMIT_CHECK( 2 + 2 + 4 ); 184 length = FT_NEXT_USHORT( p ); 185 coverage = FT_NEXT_USHORT( p ); 186#ifdef GXV_LOAD_UNUSED_VARS 187 subFeatureFlags = FT_NEXT_ULONG( p ); 188#else 189 p += 4; 190#endif 191 192 GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n", 193 i + 1, nSubtables, length )); 194 type = coverage & 0x0007; 195 rest = length - ( 2 + 2 + 4 ); 196 197 GXV_LIMIT_CHECK( rest ); 198 gxv_mort_coverage_validate( coverage, valid ); 199 200 if ( type > 5 ) 201 FT_INVALID_FORMAT; 202 203 func = fmt_funcs_table[type]; 204 if ( func == NULL ) 205 GXV_TRACE(( "morx type %d is reserved\n", type )); 206 207 func( p, p + rest, valid ); 208 209 p += rest; 210 /* TODO: validate subFeatureFlags */ 211 } 212 213 valid->subtable_length = p - table; 214 215 GXV_EXIT; 216 } 217 218 219 static void 220 gxv_mort_chain_validate( FT_Bytes table, 221 FT_Bytes limit, 222 GXV_Validator valid ) 223 { 224 FT_Bytes p = table; 225#ifdef GXV_LOAD_UNUSED_VARS 226 FT_ULong defaultFlags; 227#endif 228 FT_ULong chainLength; 229 FT_UShort nFeatureFlags; 230 FT_UShort nSubtables; 231 232 233 GXV_NAME_ENTER( "mort chain header" ); 234 235 GXV_LIMIT_CHECK( 4 + 4 + 2 + 2 ); 236#ifdef GXV_LOAD_UNUSED_VARS 237 defaultFlags = FT_NEXT_ULONG( p ); 238#else 239 p += 4; 240#endif 241 chainLength = FT_NEXT_ULONG( p ); 242 nFeatureFlags = FT_NEXT_USHORT( p ); 243 nSubtables = FT_NEXT_USHORT( p ); 244 245 gxv_mort_featurearray_validate( p, table + chainLength, 246 nFeatureFlags, valid ); 247 p += valid->subtable_length; 248 gxv_mort_subtables_validate( p, table + chainLength, nSubtables, valid ); 249 valid->subtable_length = chainLength; 250 251 /* TODO: validate defaultFlags */ 252 GXV_EXIT; 253 } 254 255 256 FT_LOCAL_DEF( void ) 257 gxv_mort_validate( FT_Bytes table, 258 FT_Face face, 259 FT_Validator ftvalid ) 260 { 261 GXV_ValidatorRec validrec; 262 GXV_Validator valid = &validrec; 263 FT_Bytes p = table; 264 FT_Bytes limit = 0; 265 FT_ULong version; 266 FT_ULong nChains; 267 FT_ULong i; 268 269 270 valid->root = ftvalid; 271 valid->face = face; 272 limit = valid->root->limit; 273 274 FT_TRACE3(( "validating `mort' table\n" )); 275 GXV_INIT; 276 277 GXV_LIMIT_CHECK( 4 + 4 ); 278 version = FT_NEXT_ULONG( p ); 279 nChains = FT_NEXT_ULONG( p ); 280 281 if (version != 0x00010000UL) 282 FT_INVALID_FORMAT; 283 284 for ( i = 0; i < nChains; i++ ) 285 { 286 GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains )); 287 GXV_32BIT_ALIGNMENT_VALIDATE( p - table ); 288 gxv_mort_chain_validate( p, limit, valid ); 289 p += valid->subtable_length; 290 } 291 292 FT_TRACE4(( "\n" )); 293 } 294 295 296/* END */