ref: e4f7673e46450298db1ce5fda8a3d310cfb50d78
dir: /src/gxvalid/gxvlcar.c/
/****************************************************************************
*
* gxvlcar.c
*
* TrueTypeGX/AAT lcar table validation (body).
*
* Copyright (C) 2004-2021 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 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_Short partial,
FT_UShort glyph,
GXV_Validator gxvalid )
{
GXV_NAME_ENTER( "partial" );
if ( GXV_LCAR_DATA( format ) != 1 )
goto Exit;
gxv_ctlPoint_validate( glyph, (FT_UShort)partial, gxvalid );
Exit:
GXV_EXIT;
}
static void
gxv_lcar_LookupValue_validate( FT_UShort glyph,
GXV_LookupValueCPtr value_p,
GXV_Validator gxvalid )
{
FT_Bytes p = gxvalid->root->base + value_p->u;
FT_Bytes limit = gxvalid->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, gxvalid );
}
GXV_EXIT;
}
/*
+------ lcar --------------------+
| |
| +===============+ |
| | lookup 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_LookupValueCPtr base_value_p,
FT_Bytes lookuptbl_limit,
GXV_Validator gxvalid )
{
FT_Bytes p;
FT_Bytes limit;
FT_UShort offset;
GXV_LookupValueDesc value;
FT_UNUSED( lookuptbl_limit );
/* XXX: check range? */
offset = (FT_UShort)( base_value_p->u +
relative_gindex * sizeof ( FT_UShort ) );
p = gxvalid->root->base + offset;
limit = gxvalid->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 gxvalidrec;
GXV_Validator gxvalid = &gxvalidrec;
GXV_lcar_DataRec lcarrec;
GXV_lcar_Data lcar = &lcarrec;
FT_Fixed version;
gxvalid->root = ftvalid;
gxvalid->table_data = lcar;
gxvalid->face = face;
FT_TRACE3(( "validating `lcar' table\n" ));
GXV_INIT;
GXV_LIMIT_CHECK( 4 + 2 );
version = FT_NEXT_LONG( p );
GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p );
if ( version != 0x00010000UL)
FT_INVALID_FORMAT;
if ( GXV_LCAR_DATA( format ) > 1 )
FT_INVALID_FORMAT;
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
gxvalid->lookupval_func = gxv_lcar_LookupValue_validate;
gxvalid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit;
gxv_LookupTable_validate( p, limit, gxvalid );
FT_TRACE4(( "\n" ));
}
/* END */