/***************************************************************************/ /* */ /* gxvmort2.c */ /* */ /* TrueTypeGX/AAT mort table validation */ /* body for type2 (Ligature 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 is supported by the Information-technology */ /* Promotion Agency(IPA), Japan. */ /* */ /***************************************************************************/ #include "gxvmort.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_gxvmort typedef struct GXV_mort_subtable_type2_StateOptRec_ { FT_UShort ligActionTable; FT_UShort componentTable; FT_UShort ligatureTable; FT_UShort ligActionTable_length; FT_UShort componentTable_length; FT_UShort ligatureTable_length; } GXV_mort_subtable_type2_StateOptRec, *GXV_mort_subtable_type2_StateOptRecData; #define GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE \ ( GXV_STATETABLE_HEADER_SIZE + 2 + 2 + 2 ) static void gxv_mort_subtable_type2_opttable_load( FT_Bytes table, FT_Bytes limit, GXV_Validator valid ) { FT_Bytes p = table; GXV_mort_subtable_type2_StateOptRecData optdata = (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata; GXV_LIMIT_CHECK( 2 + 2 + 2 ); optdata->ligActionTable = FT_NEXT_USHORT( p ); optdata->componentTable = FT_NEXT_USHORT( p ); optdata->ligatureTable = FT_NEXT_USHORT( p ); GXV_TRACE(( "offset to ligActionTable=0x%04x\n", optdata->ligActionTable )); GXV_TRACE(( "offset to componentTable=0x%04x\n", optdata->componentTable )); GXV_TRACE(( "offset to ligatureTable=0x%04x\n", optdata->ligatureTable )); } static void gxv_mort_subtable_type2_subtable_setup( FT_UShort table_size, FT_UShort classTable, FT_UShort stateArray, FT_UShort entryTable, FT_UShort *classTable_length_p, FT_UShort *stateArray_length_p, FT_UShort *entryTable_length_p, GXV_Validator valid ) { FT_UShort o[6]; FT_UShort *l[6]; FT_UShort buff[7]; GXV_mort_subtable_type2_StateOptRecData optdata = (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata; GXV_NAME_ENTER( "subtable boundaries setup" ); o[0] = classTable; o[1] = stateArray; o[2] = entryTable; o[3] = optdata->ligActionTable; o[4] = optdata->componentTable; o[5] = optdata->ligatureTable; l[0] = classTable_length_p; l[1] = stateArray_length_p; l[2] = entryTable_length_p; l[3] = &(optdata->ligActionTable_length); l[4] = &(optdata->componentTable_length); l[5] = &(optdata->ligatureTable_length); gxv_set_length_by_ushort_offset( o, l, buff, 6, table_size, valid ); GXV_TRACE(( "classTable: offset=0x%04x length=0x%04x\n", classTable, *classTable_length_p )); GXV_TRACE(( "stateArray: offset=0x%04x length=0x%04x\n", stateArray, *stateArray_length_p )); GXV_TRACE(( "entryTable: offset=0x%04x length=0x%04x\n", entryTable, *entryTable_length_p )); GXV_TRACE(( "ligActionTable: offset=0x%04x length=0x%04x\n", optdata->ligActionTable, optdata->ligActionTable_length )); GXV_TRACE(( "componentTable: offset=0x%04x length=0x%04x\n", optdata->componentTable, optdata->componentTable_length )); GXV_TRACE(( "ligatureTable: offset=0x%04x length=0x%04x\n", optdata->ligatureTable, optdata->ligatureTable_length )); GXV_EXIT; } static void gxv_mort_subtable_type2_ligActionOffset_validate( FT_Bytes table, FT_UShort ligActionOffset, GXV_Validator valid ) { /* access ligActionTable */ GXV_mort_subtable_type2_StateOptRecData optdata = (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata; FT_Bytes lat_base = table + optdata->ligActionTable; FT_Bytes p = table + ligActionOffset; FT_Bytes lat_limit = lat_base + optdata->ligActionTable; GXV_32BIT_ALIGNMENT_VALIDATE( ligActionOffset ); if ( p < lat_base ) { GXV_TRACE(( "too short offset 0x%04x: p < lat_base (%d byte rewind)\n", ligActionOffset, lat_base - p )); /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */ if ( valid->root->level >= FT_VALIDATE_PARANOID ) FT_INVALID_OFFSET; } else if ( lat_limit < p ) { GXV_TRACE(( "too large offset 0x%04x: lat_limit < p (%d byte overrun)\n", ligActionOffset, p - lat_limit )); /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */ if ( valid->root->level >= FT_VALIDATE_PARANOID ) FT_INVALID_OFFSET; } else { /* validate entry in ligActionTable */ FT_ULong lig_action; FT_UShort last; FT_UShort store; FT_ULong offset; lig_action = FT_NEXT_ULONG( p ); last = (FT_UShort)( ( lig_action >> 31 ) & 1 ); store = (FT_UShort)( ( lig_action >> 30 ) & 1 ); offset = lig_action & 0x3FFFFFFFUL; } } static void gxv_mort_subtable_type2_entry_validate( FT_Byte state, FT_UShort flags, GXV_StateTable_GlyphOffsetDesc glyphOffset, FT_Bytes table, FT_Bytes limit, GXV_Validator valid ) { FT_UShort setComponent; FT_UShort dontAdvance; FT_UShort offset; FT_UNUSED( state ); FT_UNUSED( glyphOffset ); FT_UNUSED( limit ); setComponent = (FT_UShort)( ( flags >> 15 ) & 1 ); dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); offset = (FT_UShort)( flags & 0x3FFFU ); if ( 0 < offset ) gxv_mort_subtable_type2_ligActionOffset_validate( table, offset, valid ); } static void gxv_mort_subtable_type2_ligatureTable_validate( FT_Bytes table, GXV_Validator valid ) { GXV_mort_subtable_type2_StateOptRecData optdata = (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata; FT_Bytes p = table + optdata->ligatureTable; FT_Bytes limit = table + optdata->ligatureTable + optdata->ligatureTable_length; GXV_NAME_ENTER( "mort chain subtable type2 - substitutionTable" ); if ( 0 != optdata->ligatureTable ) { /* Apple does not give specification of ligatureTable format */ while ( p < limit ) { FT_UShort lig_gid; GXV_LIMIT_CHECK( 2 ); lig_gid = FT_NEXT_USHORT( p ); } } GXV_EXIT; } FT_LOCAL_DEF( void ) gxv_mort_subtable_type2_validate( FT_Bytes table, FT_Bytes limit, GXV_Validator valid ) { FT_Bytes p = table; GXV_mort_subtable_type2_StateOptRec lig_rec; GXV_NAME_ENTER( "mort chain subtable type2 (Ligature Substitution)" ); GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE ); valid->statetable.optdata = &lig_rec; valid->statetable.optdata_load_func = gxv_mort_subtable_type2_opttable_load; valid->statetable.subtable_setup_func = gxv_mort_subtable_type2_subtable_setup; valid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE; valid->statetable.entry_validate_func = gxv_mort_subtable_type2_entry_validate; gxv_StateTable_validate( p, limit, valid ); p += valid->subtable_length; gxv_mort_subtable_type2_ligatureTable_validate( table, valid ); valid->subtable_length = p - table; GXV_EXIT; } /* END */