/modules/freetype2/src/gxvalid/gxvmorx1.c
C | 274 lines | 165 code | 67 blank | 42 comment | 6 complexity | aa4d1eecab4748225ed4c3bd046b731f MD5 | raw file
1/***************************************************************************/ 2/* */ 3/* gxvmorx1.c */ 4/* */ 5/* TrueTypeGX/AAT morx 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 "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 typedef struct GXV_morx_subtable_type1_StateOptRec_ 42 { 43 FT_ULong substitutionTable; 44 FT_ULong substitutionTable_length; 45 FT_UShort substitutionTable_num_lookupTables; 46 47 } GXV_morx_subtable_type1_StateOptRec, 48 *GXV_morx_subtable_type1_StateOptRecData; 49 50 51#define GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE \ 52 ( GXV_STATETABLE_HEADER_SIZE + 2 ) 53 54 55 static void 56 gxv_morx_subtable_type1_substitutionTable_load( FT_Bytes table, 57 FT_Bytes limit, 58 GXV_Validator valid ) 59 { 60 FT_Bytes p = table; 61 62 GXV_morx_subtable_type1_StateOptRecData optdata = 63 (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata; 64 65 66 GXV_LIMIT_CHECK( 2 ); 67 optdata->substitutionTable = FT_NEXT_USHORT( p ); 68 } 69 70 71 static void 72 gxv_morx_subtable_type1_subtable_setup( FT_ULong table_size, 73 FT_ULong classTable, 74 FT_ULong stateArray, 75 FT_ULong entryTable, 76 FT_ULong* classTable_length_p, 77 FT_ULong* stateArray_length_p, 78 FT_ULong* entryTable_length_p, 79 GXV_Validator valid ) 80 { 81 FT_ULong o[4]; 82 FT_ULong *l[4]; 83 FT_ULong buff[5]; 84 85 GXV_morx_subtable_type1_StateOptRecData optdata = 86 (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata; 87 88 89 o[0] = classTable; 90 o[1] = stateArray; 91 o[2] = entryTable; 92 o[3] = optdata->substitutionTable; 93 l[0] = classTable_length_p; 94 l[1] = stateArray_length_p; 95 l[2] = entryTable_length_p; 96 l[3] = &(optdata->substitutionTable_length); 97 98 gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid ); 99 } 100 101 102 static void 103 gxv_morx_subtable_type1_entry_validate( 104 FT_UShort state, 105 FT_UShort flags, 106 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, 107 FT_Bytes table, 108 FT_Bytes limit, 109 GXV_Validator valid ) 110 { 111 FT_UShort setMark; 112 FT_UShort dontAdvance; 113 FT_UShort reserved; 114 FT_Short markIndex; 115 FT_Short currentIndex; 116 117 GXV_morx_subtable_type1_StateOptRecData optdata = 118 (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata; 119 120 FT_UNUSED( state ); 121 FT_UNUSED( table ); 122 FT_UNUSED( limit ); 123 124 125 setMark = (FT_UShort)( ( flags >> 15 ) & 1 ); 126 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); 127 128 reserved = (FT_UShort)( flags & 0x3FFF ); 129 130 markIndex = (FT_Short)( glyphOffset_p->ul >> 16 ); 131 currentIndex = (FT_Short)( glyphOffset_p->ul ); 132 133 GXV_TRACE(( " setMark=%01d dontAdvance=%01d\n", 134 setMark, dontAdvance )); 135 136 if ( 0 < reserved ) 137 { 138 GXV_TRACE(( " non-zero bits found in reserved range\n" )); 139 if ( valid->root->level >= FT_VALIDATE_PARANOID ) 140 FT_INVALID_DATA; 141 } 142 143 GXV_TRACE(( "markIndex = %d, currentIndex = %d\n", 144 markIndex, currentIndex )); 145 146 if ( optdata->substitutionTable_num_lookupTables < markIndex + 1 ) 147 optdata->substitutionTable_num_lookupTables = 148 (FT_Short)( markIndex + 1 ); 149 150 if ( optdata->substitutionTable_num_lookupTables < currentIndex + 1 ) 151 optdata->substitutionTable_num_lookupTables = 152 (FT_Short)( currentIndex + 1 ); 153 } 154 155 156 static void 157 gxv_morx_subtable_type1_LookupValue_validate( FT_UShort glyph, 158 GXV_LookupValueCPtr value_p, 159 GXV_Validator valid ) 160 { 161 FT_UNUSED( glyph ); /* for the non-debugging case */ 162 163 GXV_TRACE(( "morx subtable type1 subst.: %d -> %d\n", glyph, value_p->u )); 164 165 if ( value_p->u > valid->face->num_glyphs ) 166 FT_INVALID_GLYPH_ID; 167 } 168 169 170 static GXV_LookupValueDesc 171 gxv_morx_subtable_type1_LookupFmt4_transit( 172 FT_UShort relative_gindex, 173 GXV_LookupValueCPtr base_value_p, 174 FT_Bytes lookuptbl_limit, 175 GXV_Validator valid ) 176 { 177 FT_Bytes p; 178 FT_Bytes limit; 179 FT_UShort offset; 180 GXV_LookupValueDesc value; 181 182 /* XXX: check range? */ 183 offset = (FT_UShort)( base_value_p->u + 184 relative_gindex * sizeof ( FT_UShort ) ); 185 186 p = valid->lookuptbl_head + offset; 187 limit = lookuptbl_limit; 188 189 GXV_LIMIT_CHECK ( 2 ); 190 value.u = FT_NEXT_USHORT( p ); 191 192 return value; 193 } 194 195 196 /* 197 * TODO: length should be limit? 198 **/ 199 static void 200 gxv_morx_subtable_type1_substitutionTable_validate( FT_Bytes table, 201 FT_Bytes limit, 202 GXV_Validator valid ) 203 { 204 FT_Bytes p = table; 205 FT_UShort i; 206 207 GXV_morx_subtable_type1_StateOptRecData optdata = 208 (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata; 209 210 211 /* TODO: calculate offset/length for each lookupTables */ 212 valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; 213 valid->lookupval_func = gxv_morx_subtable_type1_LookupValue_validate; 214 valid->lookupfmt4_trans = gxv_morx_subtable_type1_LookupFmt4_transit; 215 216 for ( i = 0; i < optdata->substitutionTable_num_lookupTables; i++ ) 217 { 218 FT_ULong offset; 219 220 221 GXV_LIMIT_CHECK( 4 ); 222 offset = FT_NEXT_ULONG( p ); 223 224 gxv_LookupTable_validate( table + offset, limit, valid ); 225 } 226 227 /* TODO: overlapping of lookupTables in substitutionTable */ 228 } 229 230 231 /* 232 * subtable for Contextual glyph substitution is a modified StateTable. 233 * In addition to classTable, stateArray, entryTable, the field 234 * `substitutionTable' is added. 235 */ 236 FT_LOCAL_DEF( void ) 237 gxv_morx_subtable_type1_validate( FT_Bytes table, 238 FT_Bytes limit, 239 GXV_Validator valid ) 240 { 241 FT_Bytes p = table; 242 243 GXV_morx_subtable_type1_StateOptRec st_rec; 244 245 246 GXV_NAME_ENTER( "morx chain subtable type1 (Contextual Glyph Subst)" ); 247 248 GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE ); 249 250 st_rec.substitutionTable_num_lookupTables = 0; 251 252 valid->xstatetable.optdata = 253 &st_rec; 254 valid->xstatetable.optdata_load_func = 255 gxv_morx_subtable_type1_substitutionTable_load; 256 valid->xstatetable.subtable_setup_func = 257 gxv_morx_subtable_type1_subtable_setup; 258 valid->xstatetable.entry_glyphoffset_fmt = 259 GXV_GLYPHOFFSET_ULONG; 260 valid->xstatetable.entry_validate_func = 261 gxv_morx_subtable_type1_entry_validate; 262 263 gxv_XStateTable_validate( p, limit, valid ); 264 265 gxv_morx_subtable_type1_substitutionTable_validate( 266 table + st_rec.substitutionTable, 267 table + st_rec.substitutionTable + st_rec.substitutionTable_length, 268 valid ); 269 270 GXV_EXIT; 271 } 272 273 274/* END */