279 lines
8.3 KiB
C
279 lines
8.3 KiB
C
/****************************************************************************
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*
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* gxvmorx1.c
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*
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* TrueTypeGX/AAT morx table validation
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* body for type1 (Contextual Substitution) subtable.
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*
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* Copyright (C) 2005-2021 by
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* suzuki toshiya, Masatake YAMATO, Red Hat K.K.,
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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/****************************************************************************
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*
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* gxvalid is derived from both gxlayout module and otvalid module.
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* Development of gxlayout is supported by the Information-technology
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* Promotion Agency(IPA), Japan.
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*
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*/
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#include "gxvmorx.h"
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/**************************************************************************
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*
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* The macro FT_COMPONENT is used in trace mode. It is an implicit
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* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
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* messages during execution.
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*/
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#undef FT_COMPONENT
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#define FT_COMPONENT gxvmorx
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typedef struct GXV_morx_subtable_type1_StateOptRec_
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{
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FT_ULong substitutionTable;
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FT_ULong substitutionTable_length;
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FT_UShort substitutionTable_num_lookupTables;
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} GXV_morx_subtable_type1_StateOptRec,
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*GXV_morx_subtable_type1_StateOptRecData;
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#define GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE \
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( GXV_STATETABLE_HEADER_SIZE + 2 )
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static void
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gxv_morx_subtable_type1_substitutionTable_load( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p = table;
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GXV_morx_subtable_type1_StateOptRecData optdata =
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(GXV_morx_subtable_type1_StateOptRecData)gxvalid->xstatetable.optdata;
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GXV_LIMIT_CHECK( 2 );
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optdata->substitutionTable = FT_NEXT_USHORT( p );
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}
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static void
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gxv_morx_subtable_type1_subtable_setup( FT_ULong table_size,
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FT_ULong classTable,
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FT_ULong stateArray,
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FT_ULong entryTable,
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FT_ULong* classTable_length_p,
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FT_ULong* stateArray_length_p,
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FT_ULong* entryTable_length_p,
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GXV_Validator gxvalid )
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{
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FT_ULong o[4];
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FT_ULong *l[4];
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FT_ULong buff[5];
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GXV_morx_subtable_type1_StateOptRecData optdata =
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(GXV_morx_subtable_type1_StateOptRecData)gxvalid->xstatetable.optdata;
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o[0] = classTable;
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o[1] = stateArray;
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o[2] = entryTable;
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o[3] = optdata->substitutionTable;
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l[0] = classTable_length_p;
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l[1] = stateArray_length_p;
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l[2] = entryTable_length_p;
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l[3] = &(optdata->substitutionTable_length);
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gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, gxvalid );
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}
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static void
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gxv_morx_subtable_type1_entry_validate(
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FT_UShort state,
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FT_UShort flags,
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GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,
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FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator gxvalid )
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{
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#ifdef GXV_LOAD_TRACE_VARS
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FT_UShort setMark;
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FT_UShort dontAdvance;
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#endif
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FT_UShort reserved;
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FT_Short markIndex;
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FT_Short currentIndex;
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GXV_morx_subtable_type1_StateOptRecData optdata =
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(GXV_morx_subtable_type1_StateOptRecData)gxvalid->xstatetable.optdata;
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FT_UNUSED( state );
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FT_UNUSED( table );
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FT_UNUSED( limit );
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#ifdef GXV_LOAD_TRACE_VARS
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setMark = (FT_UShort)( ( flags >> 15 ) & 1 );
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dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
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#endif
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reserved = (FT_UShort)( flags & 0x3FFF );
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markIndex = (FT_Short)( glyphOffset_p->ul >> 16 );
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currentIndex = (FT_Short)( glyphOffset_p->ul );
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GXV_TRACE(( " setMark=%01d dontAdvance=%01d\n",
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setMark, dontAdvance ));
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if ( 0 < reserved )
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{
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GXV_TRACE(( " non-zero bits found in reserved range\n" ));
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GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
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}
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GXV_TRACE(( "markIndex = %d, currentIndex = %d\n",
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markIndex, currentIndex ));
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if ( optdata->substitutionTable_num_lookupTables < markIndex + 1 )
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optdata->substitutionTable_num_lookupTables =
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(FT_UShort)( markIndex + 1 );
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if ( optdata->substitutionTable_num_lookupTables < currentIndex + 1 )
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optdata->substitutionTable_num_lookupTables =
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(FT_UShort)( currentIndex + 1 );
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}
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static void
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gxv_morx_subtable_type1_LookupValue_validate( FT_UShort glyph,
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GXV_LookupValueCPtr value_p,
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GXV_Validator gxvalid )
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{
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FT_UNUSED( glyph ); /* for the non-debugging case */
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GXV_TRACE(( "morx subtable type1 subst.: %d -> %d\n", glyph, value_p->u ));
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if ( value_p->u > gxvalid->face->num_glyphs )
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FT_INVALID_GLYPH_ID;
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}
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static GXV_LookupValueDesc
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gxv_morx_subtable_type1_LookupFmt4_transit(
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FT_UShort relative_gindex,
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GXV_LookupValueCPtr base_value_p,
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FT_Bytes lookuptbl_limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p;
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FT_Bytes limit;
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FT_UShort offset;
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GXV_LookupValueDesc value;
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/* XXX: check range? */
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offset = (FT_UShort)( base_value_p->u +
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relative_gindex * sizeof ( FT_UShort ) );
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p = gxvalid->lookuptbl_head + offset;
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limit = lookuptbl_limit;
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GXV_LIMIT_CHECK ( 2 );
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value.u = FT_NEXT_USHORT( p );
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return value;
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}
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/*
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* TODO: length should be limit?
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**/
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static void
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gxv_morx_subtable_type1_substitutionTable_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p = table;
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FT_UShort i;
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GXV_morx_subtable_type1_StateOptRecData optdata =
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(GXV_morx_subtable_type1_StateOptRecData)gxvalid->xstatetable.optdata;
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/* TODO: calculate offset/length for each lookupTables */
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gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
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gxvalid->lookupval_func = gxv_morx_subtable_type1_LookupValue_validate;
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gxvalid->lookupfmt4_trans = gxv_morx_subtable_type1_LookupFmt4_transit;
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for ( i = 0; i < optdata->substitutionTable_num_lookupTables; i++ )
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{
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FT_ULong offset;
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GXV_LIMIT_CHECK( 4 );
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offset = FT_NEXT_ULONG( p );
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gxv_LookupTable_validate( table + offset, limit, gxvalid );
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}
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/* TODO: overlapping of lookupTables in substitutionTable */
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}
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/*
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* subtable for Contextual glyph substitution is a modified StateTable.
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* In addition to classTable, stateArray, entryTable, the field
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* `substitutionTable' is added.
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*/
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FT_LOCAL_DEF( void )
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gxv_morx_subtable_type1_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p = table;
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GXV_morx_subtable_type1_StateOptRec st_rec;
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GXV_NAME_ENTER( "morx chain subtable type1 (Contextual Glyph Subst)" );
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GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE );
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st_rec.substitutionTable_num_lookupTables = 0;
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gxvalid->xstatetable.optdata =
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&st_rec;
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gxvalid->xstatetable.optdata_load_func =
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gxv_morx_subtable_type1_substitutionTable_load;
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gxvalid->xstatetable.subtable_setup_func =
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gxv_morx_subtable_type1_subtable_setup;
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gxvalid->xstatetable.entry_glyphoffset_fmt =
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GXV_GLYPHOFFSET_ULONG;
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gxvalid->xstatetable.entry_validate_func =
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gxv_morx_subtable_type1_entry_validate;
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gxv_XStateTable_validate( p, limit, gxvalid );
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gxv_morx_subtable_type1_substitutionTable_validate(
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table + st_rec.substitutionTable,
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table + st_rec.substitutionTable + st_rec.substitutionTable_length,
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gxvalid );
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GXV_EXIT;
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}
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/* END */
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