/***************************************************************************/ /* */ /* gxvmorx1.c */ /* */ /* TrueTypeGX/AAT morx table validation */ /* body for type1 (Contextual Substitution) subtable. */ /* */ /* Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ /***************************************************************************/ /* gxvalid is derived from both gxlayout module and otvalid module. */ /* Development of gxlayout was support of Information-technology Promotion */ /* Agency(IPA), Japan. */ /***************************************************************************/ #include "gxvmorx.h" /*************************************************************************/ /* */ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ /* messages during execution. */ /* */ #undef FT_COMPONENT #define FT_COMPONENT trace_gxvmorx typedef struct GXV_morx_subtable_type1_StateOptRec_ { FT_ULong substitutionTable; FT_ULong substitutionTable_length; FT_UShort substitutionTable_num_lookupTables; } GXV_morx_subtable_type1_StateOptRec, *GXV_morx_subtable_type1_StateOptRecData; #define GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE ( GXV_STATETABLE_HEADER_SIZE + 2 ) static void gxv_morx_subtable_type1_substitutionTable_load( FT_Bytes table, FT_Bytes limit, GXV_Validator valid ) { FT_Bytes p = table; GXV_morx_subtable_type1_StateOptRecData optdata = valid->xstatetable.optdata; GXV_LIMIT_CHECK( 2 ); optdata->substitutionTable = FT_NEXT_USHORT( p ); } static void gxv_morx_subtable_type1_subtable_setup( FT_ULong table_size, FT_ULong classTable, FT_ULong stateArray, FT_ULong entryTable, FT_ULong* classTable_length_p, FT_ULong* stateArray_length_p, FT_ULong* entryTable_length_p, GXV_Validator valid ) { FT_ULong o[4]; FT_ULong *l[4]; FT_ULong buff[5]; GXV_morx_subtable_type1_StateOptRecData optdata = valid->xstatetable.optdata; o[0] = classTable; o[1] = stateArray; o[2] = entryTable; o[3] = optdata->substitutionTable; l[0] = classTable_length_p; l[1] = stateArray_length_p; l[2] = entryTable_length_p; l[3] = &(optdata->substitutionTable_length); gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid ); } static void gxv_morx_subtable_type1_entry_validate( FT_UShort state, FT_UShort flags, GXV_StateTable_GlyphOffsetDesc glyphOffset, FT_Bytes table, FT_Bytes limit, GXV_Validator valid ) { FT_UShort setMark; FT_UShort dontAdvance; FT_UShort reserved; FT_Short markIndex; FT_Short currentIndex; GXV_morx_subtable_type1_StateOptRecData optdata = valid->xstatetable.optdata; setMark = flags / 0x8000; dontAdvance = ( flags & 0x4000 ) / 0x4000; reserved = flags & 0x3FFF; markIndex = GXV_USHORT_TO_SHORT( glyphOffset.ul / 0x00010000 ); currentIndex = GXV_USHORT_TO_SHORT( glyphOffset.ul & 0x0000FFFF ); GXV_TRACE(( " setMark=%01d dontAdvance=%01d\n", setMark, dontAdvance )); if ( 0 < reserved ) { GXV_TRACE(( " non-zero bits found in reserved range\n" )); if ( valid->root->level >= FT_VALIDATE_PARANOID ) FT_INVALID_DATA; } GXV_TRACE(( "markIndex = %d, currentIndex = %d\n", markIndex, currentIndex )); if ( optdata->substitutionTable_num_lookupTables < markIndex + 1 ) optdata->substitutionTable_num_lookupTables = markIndex + 1; if ( optdata->substitutionTable_num_lookupTables < currentIndex + 1 ) optdata->substitutionTable_num_lookupTables = currentIndex + 1; } static void gxv_morx_subtable_type1_LookupValue_validate( FT_UShort glyph, GXV_LookupValueDesc value, GXV_Validator valid ) { GXV_TRACE(( "morx subtable type1 subst.: %d -> %d\n", glyph, value.u )); if ( value.u > valid->face->num_glyphs ) FT_INVALID_GLYPH_ID; } static GXV_LookupValueDesc gxv_morx_subtable_type1_LookupFmt4_transit( FT_UShort relative_gindex, GXV_LookupValueDesc base_value, FT_Bytes lookuptbl_limit, GXV_Validator valid ) { FT_Bytes p; FT_Bytes limit; FT_UShort offset; GXV_LookupValueDesc value; offset = base_value.u + ( relative_gindex * sizeof( FT_UShort ) ); p = valid->lookuptbl_head + offset; limit = lookuptbl_limit; GXV_LIMIT_CHECK ( 2 ); value.u = FT_NEXT_USHORT( p ); return value; } /* * TODO: length should be limit? **/ static void gxv_morx_subtable_type1_substitutionTable_validate( FT_Bytes table, FT_Bytes limit, GXV_Validator valid ) { FT_Bytes p = table; GXV_morx_subtable_type1_StateOptRecData optdata = valid->xstatetable.optdata; FT_UShort i; /* TODO: calculate offset/length for each lookupTables */ valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; valid->lookupval_func = gxv_morx_subtable_type1_LookupValue_validate; valid->lookupfmt4_trans = gxv_morx_subtable_type1_LookupFmt4_transit; for ( i = 0; i < optdata->substitutionTable_num_lookupTables; i++ ) { FT_ULong offset; GXV_LIMIT_CHECK( 4 ); offset = FT_NEXT_ULONG( p ); gxv_LookupTable_validate( table + offset, limit, valid ); } /* TODO: overlapping of lookupTables in substitutionTable */ } /* * subtable for Contextual glyph substition is modified StateTable. * In addition classTable, stateArray, entryTable, "substitutionTable" * is added. */ static void gxv_morx_subtable_type1_validate( FT_Bytes table, FT_Bytes limit, GXV_Validator valid ) { FT_Bytes p = table; GXV_morx_subtable_type1_StateOptRec st_rec; GXV_NAME_ENTER( "morx chain subtable type1 (Contextual Glyph Subst)" ); GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE ); st_rec.substitutionTable_num_lookupTables = 0; valid->xstatetable.optdata = &st_rec; valid->xstatetable.optdata_load_func = gxv_morx_subtable_type1_substitutionTable_load; valid->xstatetable.subtable_setup_func = gxv_morx_subtable_type1_subtable_setup; valid->xstatetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_ULONG; valid->xstatetable.entry_validate_func = gxv_morx_subtable_type1_entry_validate; gxv_XStateTable_validate( p, limit, valid ); gxv_morx_subtable_type1_substitutionTable_validate( table + st_rec.substitutionTable, table + st_rec.substitutionTable + st_rec.substitutionTable_length, valid ); GXV_EXIT; } /* END */