/***************************************************************************/
/* */
/* gxvlcar.c */
/* */
/* TrueTypeGX/AAT lcar table validation (body). */
/* */
/* Copyright 2004, 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 "gxvalid.h"
#include "gxvcommn.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_gxvlcar
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** Data and Types *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct GXV_lcar_DataRec_
{
FT_UShort format;
} GXV_lcar_DataRec, *GXV_lcar_Data;
#define GXV_LCAR_DATA( FIELD ) GXV_TABLE_DATA( lcar, FIELD )
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** UTILITY FUNCTIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
gxv_lcar_partial_validate( FT_UShort partial,
FT_UShort glyph,
GXV_Validator valid )
{
GXV_NAME_ENTER( "partial" );
if ( GXV_LCAR_DATA( format ) != 1 )
goto Exit;
gxv_ctlPoint_validate( glyph, partial, valid );
Exit:
GXV_EXIT;
}
static void
gxv_lcar_LookupValue_validate( FT_UShort glyph,
GXV_LookupValueDesc value,
GXV_Validator valid )
{
FT_Bytes p = valid->root->base + value.u;
FT_Bytes limit = valid->root->limit;
FT_UShort count;
FT_Short partial;
FT_UShort i;
GXV_NAME_ENTER( "element in lookupTable" );
GXV_LIMIT_CHECK( 2 );
count = FT_NEXT_USHORT( p );
GXV_LIMIT_CHECK( 2 * count );
for ( i = 0; i < count; i++ )
{
partial = FT_NEXT_SHORT( p );
gxv_lcar_partial_validate( partial, glyph, valid );
}
GXV_EXIT;
}
/*
+------ lcar --------------------+
| |
| +===============+ |
| | looup header | |
| +===============+ |
| | BinSrchHeader | |
| +===============+ |
| | lastGlyph[0] | |
| +---------------+ |
| | firstGlyph[0] | | head of lcar sfnt table
| +---------------+ | +
| | offset[0] | -> | offset [byte]
| +===============+ | +
| | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
| +---------------+ |
| | firstGlyph[1] | |
| +---------------+ |
| | offset[1] | |
| +===============+ |
| |
| .... |
| |
| 16bit value array |
| +===============+ |
+------| value | <-------+
| ....
|
|
|
|
|
+----> lcar values...handled by lcar callback function
*/
static GXV_LookupValueDesc
gxv_lcar_LookupFmt4_transit( FT_UShort relative_gindex,
GXV_LookupValueDesc base_value,
FT_Bytes lookuptbl_limit,
GXV_Validator valid )
{
FT_Bytes p;
FT_Bytes limit;
FT_UShort offset;
GXV_LookupValueDesc value;
FT_UNUSED( lookuptbl_limit );
/* XXX: check range? */
offset = (FT_UShort)( base_value.u +
relative_gindex * sizeof ( FT_UShort ) );
p = valid->root->base + offset;
limit = valid->root->limit;
GXV_LIMIT_CHECK ( 2 );
value.u = FT_NEXT_USHORT( p );
return value;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** lcar TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
gxv_lcar_validate( FT_Bytes table,
FT_Face face,
FT_Validator ftvalid )
{
FT_Bytes p = table;
FT_Bytes limit = 0;
GXV_ValidatorRec validrec;
GXV_Validator valid = &validrec;
GXV_lcar_DataRec lcarrec;
GXV_lcar_Data lcar = &lcarrec;
FT_Fixed version;
valid->root = ftvalid;
valid->table_data = lcar;
valid->face = face;
FT_TRACE3(( "validating `lcar' table\n" ));
GXV_INIT;
GXV_LIMIT_CHECK( 4 + 2 );
version = FT_NEXT_ULONG( p );
GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p );
if ( version != 0x00010000UL)
FT_INVALID_FORMAT;
if ( GXV_LCAR_DATA( format ) > 1 )
FT_INVALID_FORMAT;
valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
valid->lookupval_func = gxv_lcar_LookupValue_validate;
valid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit;
gxv_LookupTable_validate( p, limit, valid );
FT_TRACE4(( "\n" ));
}
/* END */
