335 lines
9.4 KiB
C
335 lines
9.4 KiB
C
/****************************************************************************
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*
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* gxvbsln.c
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*
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* TrueTypeGX/AAT bsln table validation (body).
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*
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* Copyright (C) 2004-2021 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 "gxvalid.h"
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#include "gxvcommn.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 gxvbsln
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** Data and Types *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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#define GXV_BSLN_VALUE_COUNT 32
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#define GXV_BSLN_VALUE_EMPTY 0xFFFFU
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typedef struct GXV_bsln_DataRec_
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{
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FT_Bytes ctlPoints_p;
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FT_UShort defaultBaseline;
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} GXV_bsln_DataRec, *GXV_bsln_Data;
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#define GXV_BSLN_DATA( field ) GXV_TABLE_DATA( bsln, field )
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** UTILITY FUNCTIONS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static void
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gxv_bsln_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_UShort v = value_p->u;
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FT_UShort* ctlPoints;
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FT_UNUSED( glyph );
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GXV_NAME_ENTER( "lookup value" );
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if ( v >= GXV_BSLN_VALUE_COUNT )
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FT_INVALID_DATA;
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ctlPoints = (FT_UShort*)GXV_BSLN_DATA( ctlPoints_p );
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if ( ctlPoints && ctlPoints[v] == GXV_BSLN_VALUE_EMPTY )
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FT_INVALID_DATA;
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GXV_EXIT;
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}
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/*
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+===============+ --------+
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| lookup header | |
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+===============+ |
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| BinSrchHeader | |
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+===============+ |
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| lastGlyph[0] | |
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+---------------+ |
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| firstGlyph[0] | | head of lookup table
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+---------------+ | +
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| offset[0] | -> | offset [byte]
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+===============+ | +
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| lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
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+---------------+ |
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| firstGlyph[1] | |
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+---------------+ |
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| offset[1] | |
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+===============+ |
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... |
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16bit value array |
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+===============+ |
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| value | <-------+
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...
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*/
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static GXV_LookupValueDesc
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gxv_bsln_LookupFmt4_transit( 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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static void
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gxv_bsln_parts_fmt0_validate( FT_Bytes tables,
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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 = tables;
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GXV_NAME_ENTER( "parts format 0" );
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/* deltas */
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GXV_LIMIT_CHECK( 2 * GXV_BSLN_VALUE_COUNT );
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gxvalid->table_data = NULL; /* No ctlPoints here. */
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GXV_EXIT;
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}
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static void
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gxv_bsln_parts_fmt1_validate( FT_Bytes tables,
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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 = tables;
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GXV_NAME_ENTER( "parts format 1" );
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/* deltas */
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gxv_bsln_parts_fmt0_validate( p, limit, gxvalid );
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/* mappingData */
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gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
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gxvalid->lookupval_func = gxv_bsln_LookupValue_validate;
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gxvalid->lookupfmt4_trans = gxv_bsln_LookupFmt4_transit;
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gxv_LookupTable_validate( p + 2 * GXV_BSLN_VALUE_COUNT,
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limit,
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gxvalid );
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GXV_EXIT;
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}
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static void
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gxv_bsln_parts_fmt2_validate( FT_Bytes tables,
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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 = tables;
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FT_UShort stdGlyph;
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FT_UShort ctlPoint;
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FT_Int i;
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FT_UShort defaultBaseline = GXV_BSLN_DATA( defaultBaseline );
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GXV_NAME_ENTER( "parts format 2" );
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GXV_LIMIT_CHECK( 2 + ( 2 * GXV_BSLN_VALUE_COUNT ) );
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/* stdGlyph */
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stdGlyph = FT_NEXT_USHORT( p );
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GXV_TRACE(( " (stdGlyph = %u)\n", stdGlyph ));
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gxv_glyphid_validate( stdGlyph, gxvalid );
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/* Record the position of ctlPoints */
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GXV_BSLN_DATA( ctlPoints_p ) = p;
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/* ctlPoints */
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for ( i = 0; i < GXV_BSLN_VALUE_COUNT; i++ )
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{
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ctlPoint = FT_NEXT_USHORT( p );
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if ( ctlPoint == GXV_BSLN_VALUE_EMPTY )
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{
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if ( i == defaultBaseline )
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FT_INVALID_DATA;
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}
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else
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gxv_ctlPoint_validate( stdGlyph, ctlPoint, gxvalid );
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}
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GXV_EXIT;
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}
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static void
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gxv_bsln_parts_fmt3_validate( FT_Bytes tables,
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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 = tables;
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GXV_NAME_ENTER( "parts format 3" );
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/* stdGlyph + ctlPoints */
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gxv_bsln_parts_fmt2_validate( p, limit, gxvalid );
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/* mappingData */
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gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
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gxvalid->lookupval_func = gxv_bsln_LookupValue_validate;
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gxvalid->lookupfmt4_trans = gxv_bsln_LookupFmt4_transit;
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gxv_LookupTable_validate( p + ( 2 + 2 * GXV_BSLN_VALUE_COUNT ),
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limit,
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gxvalid );
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GXV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** bsln TABLE *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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FT_LOCAL_DEF( void )
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gxv_bsln_validate( FT_Bytes table,
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FT_Face face,
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FT_Validator ftvalid )
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{
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GXV_ValidatorRec gxvalidrec;
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GXV_Validator gxvalid = &gxvalidrec;
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GXV_bsln_DataRec bslnrec;
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GXV_bsln_Data bsln = &bslnrec;
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FT_Bytes p = table;
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FT_Bytes limit = 0;
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FT_ULong version;
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FT_UShort format;
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FT_UShort defaultBaseline;
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GXV_Validate_Func fmt_funcs_table [] =
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{
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gxv_bsln_parts_fmt0_validate,
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gxv_bsln_parts_fmt1_validate,
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gxv_bsln_parts_fmt2_validate,
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gxv_bsln_parts_fmt3_validate,
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};
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gxvalid->root = ftvalid;
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gxvalid->table_data = bsln;
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gxvalid->face = face;
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FT_TRACE3(( "validating `bsln' table\n" ));
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GXV_INIT;
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GXV_LIMIT_CHECK( 4 + 2 + 2 );
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version = FT_NEXT_ULONG( p );
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format = FT_NEXT_USHORT( p );
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defaultBaseline = FT_NEXT_USHORT( p );
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/* only version 1.0 is defined (1996) */
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if ( version != 0x00010000UL )
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FT_INVALID_FORMAT;
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/* only format 1, 2, 3 are defined (1996) */
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GXV_TRACE(( " (format = %d)\n", format ));
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if ( format > 3 )
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FT_INVALID_FORMAT;
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if ( defaultBaseline > 31 )
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FT_INVALID_FORMAT;
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bsln->defaultBaseline = defaultBaseline;
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fmt_funcs_table[format]( p, limit, gxvalid );
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FT_TRACE4(( "\n" ));
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}
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/* arch-tag: ebe81143-fdaa-4c68-a4d1-b57227daa3bc
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(do not change this comment) */
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/* END */
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