/**************************************************************************** * * gxvmorx1.c * * TrueTypeGX/AAT morx table validation * body for type1 (Contextual Substitution) subtable. * * Copyright (C) 2005-2020 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 "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 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 gxvalid ) { FT_Bytes p = table; GXV_morx_subtable_type1_StateOptRecData optdata = (GXV_morx_subtable_type1_StateOptRecData)gxvalid->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 gxvalid ) { FT_ULong o[4]; FT_ULong *l[4]; FT_ULong buff[5]; GXV_morx_subtable_type1_StateOptRecData optdata = (GXV_morx_subtable_type1_StateOptRecData)gxvalid->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, gxvalid ); } static void gxv_morx_subtable_type1_entry_validate( FT_UShort state, FT_UShort flags, GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid ) { #ifdef GXV_LOAD_TRACE_VARS FT_UShort setMark; FT_UShort dontAdvance; #endif FT_UShort reserved; FT_Short markIndex; FT_Short currentIndex; GXV_morx_subtable_type1_StateOptRecData optdata = (GXV_morx_subtable_type1_StateOptRecData)gxvalid->xstatetable.optdata; FT_UNUSED( state ); FT_UNUSED( table ); FT_UNUSED( limit ); #ifdef GXV_LOAD_TRACE_VARS setMark = (FT_UShort)( ( flags >> 15 ) & 1 ); dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); #endif reserved = (FT_UShort)( flags & 0x3FFF ); markIndex = (FT_Short)( glyphOffset_p->ul >> 16 ); currentIndex = (FT_Short)( glyphOffset_p->ul ); GXV_TRACE(( " setMark=%01d dontAdvance=%01d\n", setMark, dontAdvance )); if ( 0 < reserved ) { GXV_TRACE(( " non-zero bits found in reserved range\n" )); GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); } GXV_TRACE(( "markIndex = %d, currentIndex = %d\n", markIndex, currentIndex )); if ( optdata->substitutionTable_num_lookupTables < markIndex + 1 ) optdata->substitutionTable_num_lookupTables = (FT_UShort)( markIndex + 1 ); if ( optdata->substitutionTable_num_lookupTables < currentIndex + 1 ) optdata->substitutionTable_num_lookupTables = (FT_UShort)( currentIndex + 1 ); } static void gxv_morx_subtable_type1_LookupValue_validate( FT_UShort glyph, GXV_LookupValueCPtr value_p, GXV_Validator gxvalid ) { FT_UNUSED( glyph ); /* for the non-debugging case */ GXV_TRACE(( "morx subtable type1 subst.: %d -> %d\n", glyph, value_p->u )); if ( value_p->u > gxvalid->face->num_glyphs ) FT_INVALID_GLYPH_ID; } static GXV_LookupValueDesc gxv_morx_subtable_type1_LookupFmt4_transit( FT_UShort relative_gindex, GXV_LookupValueCPtr base_value_p, FT_Bytes lookuptbl_limit, GXV_Validator gxvalid ) { FT_Bytes p; FT_Bytes limit; FT_UShort offset; GXV_LookupValueDesc value; /* XXX: check range? */ offset = (FT_UShort)( base_value_p->u + relative_gindex * sizeof ( FT_UShort ) ); p = gxvalid->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 gxvalid ) { FT_Bytes p = table; FT_UShort i; GXV_morx_subtable_type1_StateOptRecData optdata = (GXV_morx_subtable_type1_StateOptRecData)gxvalid->xstatetable.optdata; /* TODO: calculate offset/length for each lookupTables */ gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; gxvalid->lookupval_func = gxv_morx_subtable_type1_LookupValue_validate; gxvalid->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, gxvalid ); } /* TODO: overlapping of lookupTables in substitutionTable */ } /* * subtable for Contextual glyph substitution is a modified StateTable. * In addition to classTable, stateArray, entryTable, the field * `substitutionTable' is added. */ FT_LOCAL_DEF( void ) gxv_morx_subtable_type1_validate( FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid ) { 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; gxvalid->xstatetable.optdata = &st_rec; gxvalid->xstatetable.optdata_load_func = gxv_morx_subtable_type1_substitutionTable_load; gxvalid->xstatetable.subtable_setup_func = gxv_morx_subtable_type1_subtable_setup; gxvalid->xstatetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_ULONG; gxvalid->xstatetable.entry_validate_func = gxv_morx_subtable_type1_entry_validate; gxv_XStateTable_validate( p, limit, gxvalid ); gxv_morx_subtable_type1_substitutionTable_validate( table + st_rec.substitutionTable, table + st_rec.substitutionTable + st_rec.substitutionTable_length, gxvalid ); GXV_EXIT; } /* END */