/src/freetype/src/gxvalid/gxvmort1.c
C | 259 lines | 163 code | 58 blank | 38 comment | 5 complexity | 09f0f8292d9cab813acc5c34292f28a7 MD5 | raw file
1/***************************************************************************/ 2/* */ 3/* gxvmort1.c */ 4/* */ 5/* TrueTypeGX/AAT mort table validation */ 6/* body for type1 (Contextual Substitution) subtable. */ 7/* */ 8/* Copyright 2005, 2007 by 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 "gxvmort.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 typedef struct GXV_mort_subtable_type1_StateOptRec_ 42 { 43 FT_UShort substitutionTable; 44 FT_UShort substitutionTable_length; 45 46 } GXV_mort_subtable_type1_StateOptRec, 47 *GXV_mort_subtable_type1_StateOptRecData; 48 49#define GXV_MORT_SUBTABLE_TYPE1_HEADER_SIZE \ 50 ( GXV_STATETABLE_HEADER_SIZE + 2 ) 51 52 53 static void 54 gxv_mort_subtable_type1_substitutionTable_load( FT_Bytes table, 55 FT_Bytes limit, 56 GXV_Validator valid ) 57 { 58 FT_Bytes p = table; 59 60 GXV_mort_subtable_type1_StateOptRecData optdata = 61 (GXV_mort_subtable_type1_StateOptRecData)valid->statetable.optdata; 62 63 64 GXV_LIMIT_CHECK( 2 ); 65 optdata->substitutionTable = FT_NEXT_USHORT( p ); 66 } 67 68 69 static void 70 gxv_mort_subtable_type1_subtable_setup( FT_UShort table_size, 71 FT_UShort classTable, 72 FT_UShort stateArray, 73 FT_UShort entryTable, 74 FT_UShort* classTable_length_p, 75 FT_UShort* stateArray_length_p, 76 FT_UShort* entryTable_length_p, 77 GXV_Validator valid ) 78 { 79 FT_UShort o[4]; 80 FT_UShort *l[4]; 81 FT_UShort buff[5]; 82 83 GXV_mort_subtable_type1_StateOptRecData optdata = 84 (GXV_mort_subtable_type1_StateOptRecData)valid->statetable.optdata; 85 86 87 o[0] = classTable; 88 o[1] = stateArray; 89 o[2] = entryTable; 90 o[3] = optdata->substitutionTable; 91 l[0] = classTable_length_p; 92 l[1] = stateArray_length_p; 93 l[2] = entryTable_length_p; 94 l[3] = &( optdata->substitutionTable_length ); 95 96 gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, valid ); 97 } 98 99 100 static void 101 gxv_mort_subtable_type1_offset_to_subst_validate( 102 FT_Short wordOffset, 103 const FT_String* tag, 104 FT_Byte state, 105 GXV_Validator valid ) 106 { 107 FT_UShort substTable; 108 FT_UShort substTable_limit; 109 110 FT_UNUSED( tag ); 111 FT_UNUSED( state ); 112 113 114 substTable = 115 ((GXV_mort_subtable_type1_StateOptRec *) 116 (valid->statetable.optdata))->substitutionTable; 117 substTable_limit = 118 (FT_UShort)( substTable + 119 ((GXV_mort_subtable_type1_StateOptRec *) 120 (valid->statetable.optdata))->substitutionTable_length ); 121 122 valid->min_gid = (FT_UShort)( ( substTable - wordOffset * 2 ) / 2 ); 123 valid->max_gid = (FT_UShort)( ( substTable_limit - wordOffset * 2 ) / 2 ); 124 valid->max_gid = (FT_UShort)( FT_MAX( valid->max_gid, 125 valid->face->num_glyphs ) ); 126 127 /* XXX: check range? */ 128 129 /* TODO: min_gid & max_gid comparison with ClassTable contents */ 130 } 131 132 133 static void 134 gxv_mort_subtable_type1_entry_validate( 135 FT_Byte state, 136 FT_UShort flags, 137 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, 138 FT_Bytes table, 139 FT_Bytes limit, 140 GXV_Validator valid ) 141 { 142#ifdef GXV_LOAD_UNUSED_VARS 143 FT_UShort setMark; 144 FT_UShort dontAdvance; 145#endif 146 FT_UShort reserved; 147 FT_Short markOffset; 148 FT_Short currentOffset; 149 150 FT_UNUSED( table ); 151 FT_UNUSED( limit ); 152 153 154#ifdef GXV_LOAD_UNUSED_VARS 155 setMark = (FT_UShort)( flags >> 15 ); 156 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); 157#endif 158 reserved = (FT_Short)( flags & 0x3FFF ); 159 160 markOffset = (FT_Short)( glyphOffset_p->ul >> 16 ); 161 currentOffset = (FT_Short)( glyphOffset_p->ul ); 162 163 if ( 0 < reserved ) 164 { 165 GXV_TRACE(( " non-zero bits found in reserved range\n" )); 166 GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); 167 } 168 169 gxv_mort_subtable_type1_offset_to_subst_validate( markOffset, 170 "markOffset", 171 state, 172 valid ); 173 174 gxv_mort_subtable_type1_offset_to_subst_validate( currentOffset, 175 "currentOffset", 176 state, 177 valid ); 178 } 179 180 181 static void 182 gxv_mort_subtable_type1_substTable_validate( FT_Bytes table, 183 FT_Bytes limit, 184 GXV_Validator valid ) 185 { 186 FT_Bytes p = table; 187 FT_UShort num_gids = (FT_UShort)( 188 ((GXV_mort_subtable_type1_StateOptRec *) 189 (valid->statetable.optdata))->substitutionTable_length / 2 ); 190 FT_UShort i; 191 192 193 GXV_NAME_ENTER( "validating contents of substitutionTable" ); 194 for ( i = 0; i < num_gids ; i ++ ) 195 { 196 FT_UShort dst_gid; 197 198 199 GXV_LIMIT_CHECK( 2 ); 200 dst_gid = FT_NEXT_USHORT( p ); 201 202 if ( dst_gid >= 0xFFFFU ) 203 continue; 204 205 if ( dst_gid < valid->min_gid || valid->max_gid < dst_gid ) 206 { 207 GXV_TRACE(( "substTable include a strange gid[%d]=%d >" 208 " out of define range (%d..%d)\n", 209 i, dst_gid, valid->min_gid, valid->max_gid )); 210 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); 211 } 212 } 213 214 GXV_EXIT; 215 } 216 217 218 /* 219 * subtable for Contextual glyph substitution is a modified StateTable. 220 * In addition to classTable, stateArray, and entryTable, the field 221 * `substitutionTable' is added. 222 */ 223 FT_LOCAL_DEF( void ) 224 gxv_mort_subtable_type1_validate( FT_Bytes table, 225 FT_Bytes limit, 226 GXV_Validator valid ) 227 { 228 FT_Bytes p = table; 229 230 GXV_mort_subtable_type1_StateOptRec st_rec; 231 232 233 GXV_NAME_ENTER( "mort chain subtable type1 (Contextual Glyph Subst)" ); 234 235 GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE1_HEADER_SIZE ); 236 237 valid->statetable.optdata = 238 &st_rec; 239 valid->statetable.optdata_load_func = 240 gxv_mort_subtable_type1_substitutionTable_load; 241 valid->statetable.subtable_setup_func = 242 gxv_mort_subtable_type1_subtable_setup; 243 valid->statetable.entry_glyphoffset_fmt = 244 GXV_GLYPHOFFSET_ULONG; 245 valid->statetable.entry_validate_func = 246 247 gxv_mort_subtable_type1_entry_validate; 248 gxv_StateTable_validate( p, limit, valid ); 249 250 gxv_mort_subtable_type1_substTable_validate( 251 table + st_rec.substitutionTable, 252 table + st_rec.substitutionTable + st_rec.substitutionTable_length, 253 valid ); 254 255 GXV_EXIT; 256 } 257 258 259/* END */