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/****************************************************************************
*
* gxvmort4.c
*
* TrueTypeGX/AAT mort table validation
* body for type4 (Non-Contextual Glyph Substitution) subtable.
*
* Copyright (C) 2005-2023 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 "gxvmort.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 gxvmort
static void
gxv_mort_subtable_type4_lookupval_validate( FT_UShort glyph,
GXV_LookupValueCPtr value_p,
GXV_Validator gxvalid )
{
FT_UNUSED( glyph );
gxv_glyphid_validate( value_p->u, gxvalid );
}
/*
+===============+ --------+
| lookup header | |
+===============+ |
| BinSrchHeader | |
+===============+ |
| lastGlyph[0] | |
+---------------+ |
| firstGlyph[0] | | head of lookup table
+---------------+ | +
| offset[0] | -> | offset [byte]
+===============+ | +
| lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
+---------------+ |
| firstGlyph[1] | |
+---------------+ |
| offset[1] | |
+===============+ |
|
.... |
|
16bit value array |
+===============+ |
| value | <-------+
....
*/
static GXV_LookupValueDesc
gxv_mort_subtable_type4_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;
/* XXX: check range? */
offset = (FT_UShort)( base_value_p->u +
relative_gindex * sizeof ( FT_UShort ) );
p = gxvalid->lookuptbl_head + offset;
limit = lookuptbl_limit;
GXV_LIMIT_CHECK( 2 );
value.u = FT_NEXT_USHORT( p );
return value;
}
FT_LOCAL_DEF( void )
gxv_mort_subtable_type4_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
GXV_NAME_ENTER( "mort chain subtable type4 "
"(Non-Contextual Glyph Substitution)" );
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
gxvalid->lookupval_func = gxv_mort_subtable_type4_lookupval_validate;
gxvalid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit;
gxv_LookupTable_validate( p, limit, gxvalid );
GXV_EXIT;
}
/* END */
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