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/***************************************************************************/
/* */
/* gxvmorx.c */
/* */
/* TrueTypeGX/AAT morx table validation (body). */
/* */
/* Copyright 2005, 2008 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 "gxvmorx.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_gxvmorx
static void
gxv_morx_subtables_validate( FT_Bytes table,
FT_Bytes limit,
FT_UShort nSubtables,
GXV_Validator valid )
{
FT_Bytes p = table;
GXV_Validate_Func fmt_funcs_table[] =
{
gxv_morx_subtable_type0_validate, /* 0 */
gxv_morx_subtable_type1_validate, /* 1 */
gxv_morx_subtable_type2_validate, /* 2 */
NULL, /* 3 */
gxv_morx_subtable_type4_validate, /* 4 */
gxv_morx_subtable_type5_validate, /* 5 */
};
GXV_Validate_Func func;
FT_UShort i;
GXV_NAME_ENTER( "subtables in a chain" );
for ( i = 0; i < nSubtables; i++ )
{
FT_ULong length;
FT_ULong coverage;
FT_ULong subFeatureFlags;
FT_ULong type;
FT_ULong rest;
GXV_LIMIT_CHECK( 4 + 4 + 4 );
length = FT_NEXT_ULONG( p );
coverage = FT_NEXT_ULONG( p );
subFeatureFlags = FT_NEXT_ULONG( p );
GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",
i + 1, nSubtables, length ));
type = coverage & 0x0007;
rest = length - ( 4 + 4 + 4 );
GXV_LIMIT_CHECK( rest );
/* morx coverage consists of mort_coverage & 16bit padding */
gxv_mort_coverage_validate( (FT_UShort)( ( coverage >> 16 ) | coverage ),
valid );
if ( type > 5 )
FT_INVALID_FORMAT;
func = fmt_funcs_table[type];
if ( func == NULL )
GXV_TRACE(( "morx type %d is reserved\n", type ));
func( p, p + rest, valid );
p += rest;
}
valid->subtable_length = p - table;
GXV_EXIT;
}
static void
gxv_morx_chain_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_ULong defaultFlags;
FT_ULong chainLength;
FT_ULong nFeatureFlags;
FT_ULong nSubtables;
GXV_NAME_ENTER( "morx chain header" );
GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );
defaultFlags = FT_NEXT_ULONG( p );
chainLength = FT_NEXT_ULONG( p );
nFeatureFlags = FT_NEXT_ULONG( p );
nSubtables = FT_NEXT_ULONG( p );
/* feature-array of morx is same with that of mort */
gxv_mort_featurearray_validate( p, limit, nFeatureFlags, valid );
p += valid->subtable_length;
if ( nSubtables >= 0x10000L )
FT_INVALID_DATA;
gxv_morx_subtables_validate( p, table + chainLength,
(FT_UShort)nSubtables, valid );
valid->subtable_length = chainLength;
GXV_EXIT;
}
FT_LOCAL_DEF( void )
gxv_morx_validate( FT_Bytes table,
FT_Face face,
FT_Validator ftvalid )
{
GXV_ValidatorRec validrec;
GXV_Validator valid = &validrec;
FT_Bytes p = table;
FT_Bytes limit = 0;
FT_ULong version;
FT_ULong nChains;
FT_ULong i;
valid->root = ftvalid;
valid->face = face;
FT_TRACE3(( "validating `morx' table\n" ));
GXV_INIT;
GXV_LIMIT_CHECK( 4 + 4 );
version = FT_NEXT_ULONG( p );
nChains = FT_NEXT_ULONG( p );
if ( version != 0x00020000UL )
FT_INVALID_FORMAT;
for ( i = 0; i < nChains; i++ )
{
GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains ));
GXV_32BIT_ALIGNMENT_VALIDATE( p - table );
gxv_morx_chain_validate( p, limit, valid );
p += valid->subtable_length;
}
FT_TRACE4(( "\n" ));
}
/* END */
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