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/***************************************************************************/
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/* */
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/* gxvlcar.c */
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/* */
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/* TrueTypeGX/AAT lcar table validation (body). */
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/* */
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/* Copyright 2004, 2005 by 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 trace_gxvlcar
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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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typedef struct GXV_lcar_DataRec_
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{
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FT_UShort format;
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} GXV_lcar_DataRec, *GXV_lcar_Data;
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#define GXV_LCAR_DATA( FIELD ) GXV_TABLE_DATA( lcar, 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_lcar_partial_validate( FT_UShort partial,
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FT_UShort glyph,
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GXV_Validator valid )
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{
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GXV_NAME_ENTER( "partial" );
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if ( GXV_LCAR_DATA( format ) != 1 )
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goto Exit;
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gxv_ctlPoint_validate( glyph, partial, valid );
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Exit:
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GXV_EXIT;
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}
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static void
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gxv_lcar_LookupValue_validate( FT_UShort glyph,
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GXV_LookupValueCPtr value_p,
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GXV_Validator valid )
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{
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FT_Bytes p = valid->root->base + value_p->u;
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FT_Bytes limit = valid->root->limit;
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FT_UShort count;
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FT_Short partial;
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FT_UShort i;
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GXV_NAME_ENTER( "element in lookupTable" );
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GXV_LIMIT_CHECK( 2 );
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count = FT_NEXT_USHORT( p );
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GXV_LIMIT_CHECK( 2 * count );
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for ( i = 0; i < count; i++ )
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{
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partial = FT_NEXT_SHORT( p );
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gxv_lcar_partial_validate( partial, glyph, valid );
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}
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GXV_EXIT;
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}
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/*
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+------ lcar --------------------+
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| |
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| +===============+ |
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| | looup 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 lcar sfnt 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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+----> lcar values...handled by lcar callback function
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*/
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static GXV_LookupValueDesc
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gxv_lcar_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 valid )
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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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FT_UNUSED( lookuptbl_limit );
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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 = valid->root->base + offset;
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limit = valid->root->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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/*************************************************************************/
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/***** *****/
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/***** lcar 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_lcar_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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FT_Bytes p = table;
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FT_Bytes limit = 0;
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GXV_ValidatorRec validrec;
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GXV_Validator valid = &validrec;
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GXV_lcar_DataRec lcarrec;
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GXV_lcar_Data lcar = &lcarrec;
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FT_Fixed version;
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valid->root = ftvalid;
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valid->table_data = lcar;
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valid->face = face;
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FT_TRACE3(( "validating `lcar' table\n" ));
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GXV_INIT;
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GXV_LIMIT_CHECK( 4 + 2 );
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version = FT_NEXT_ULONG( p );
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GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p );
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if ( version != 0x00010000UL)
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FT_INVALID_FORMAT;
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if ( GXV_LCAR_DATA( format ) > 1 )
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FT_INVALID_FORMAT;
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valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
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valid->lookupval_func = gxv_lcar_LookupValue_validate;
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valid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit;
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gxv_LookupTable_validate( p, limit, valid );
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FT_TRACE4(( "\n" ));
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}
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/* END */
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