200 lines
5.1 KiB
C
200 lines
5.1 KiB
C
/****************************************************************************
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*
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* gxvmorx.c
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*
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* TrueTypeGX/AAT morx table validation (body).
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*
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* Copyright (C) 2005-2021 by
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* 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 "gxvmorx.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 gxvmorx
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static void
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gxv_morx_subtables_validate( FT_Bytes table,
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FT_Bytes limit,
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FT_UShort nSubtables,
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GXV_Validator gxvalid )
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{
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FT_Bytes p = table;
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GXV_Validate_Func fmt_funcs_table[] =
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{
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gxv_morx_subtable_type0_validate, /* 0 */
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gxv_morx_subtable_type1_validate, /* 1 */
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gxv_morx_subtable_type2_validate, /* 2 */
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NULL, /* 3 */
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gxv_morx_subtable_type4_validate, /* 4 */
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gxv_morx_subtable_type5_validate, /* 5 */
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};
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FT_UShort i;
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GXV_NAME_ENTER( "subtables in a chain" );
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for ( i = 0; i < nSubtables; i++ )
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{
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GXV_Validate_Func func;
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FT_ULong length;
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FT_ULong coverage;
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#ifdef GXV_LOAD_UNUSED_VARS
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FT_ULong subFeatureFlags;
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#endif
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FT_ULong type;
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FT_ULong rest;
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GXV_LIMIT_CHECK( 4 + 4 + 4 );
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length = FT_NEXT_ULONG( p );
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coverage = FT_NEXT_ULONG( p );
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#ifdef GXV_LOAD_UNUSED_VARS
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subFeatureFlags = FT_NEXT_ULONG( p );
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#else
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p += 4;
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#endif
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GXV_TRACE(( "validating chain subtable %d/%d (%lu bytes)\n",
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i + 1, nSubtables, length ));
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type = coverage & 0x0007;
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rest = length - ( 4 + 4 + 4 );
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GXV_LIMIT_CHECK( rest );
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/* morx coverage consists of mort_coverage & 16bit padding */
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gxv_mort_coverage_validate( (FT_UShort)( ( coverage >> 16 ) | coverage ),
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gxvalid );
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if ( type > 5 )
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FT_INVALID_FORMAT;
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func = fmt_funcs_table[type];
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if ( !func )
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GXV_TRACE(( "morx type %lu is reserved\n", type ));
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func( p, p + rest, gxvalid );
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/* TODO: subFeatureFlags should be unique in a table? */
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p += rest;
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}
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gxvalid->subtable_length = (FT_ULong)( p - table );
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GXV_EXIT;
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}
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static void
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gxv_morx_chain_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p = table;
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#ifdef GXV_LOAD_UNUSED_VARS
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FT_ULong defaultFlags;
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#endif
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FT_ULong chainLength;
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FT_ULong nFeatureFlags;
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FT_ULong nSubtables;
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GXV_NAME_ENTER( "morx chain header" );
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GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );
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#ifdef GXV_LOAD_UNUSED_VARS
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defaultFlags = FT_NEXT_ULONG( p );
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#else
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p += 4;
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#endif
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chainLength = FT_NEXT_ULONG( p );
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nFeatureFlags = FT_NEXT_ULONG( p );
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nSubtables = FT_NEXT_ULONG( p );
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/* feature-array of morx is same with that of mort */
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gxv_mort_featurearray_validate( p, limit, nFeatureFlags, gxvalid );
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p += gxvalid->subtable_length;
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if ( nSubtables >= 0x10000L )
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FT_INVALID_DATA;
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gxv_morx_subtables_validate( p, table + chainLength,
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(FT_UShort)nSubtables, gxvalid );
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gxvalid->subtable_length = chainLength;
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/* TODO: defaultFlags should be compared with the flags in tables */
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GXV_EXIT;
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}
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FT_LOCAL_DEF( void )
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gxv_morx_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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GXV_ValidatorRec gxvalidrec;
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GXV_Validator gxvalid = &gxvalidrec;
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FT_Bytes p = table;
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FT_Bytes limit = 0;
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FT_ULong version;
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FT_ULong nChains;
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FT_ULong i;
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gxvalid->root = ftvalid;
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gxvalid->face = face;
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FT_TRACE3(( "validating `morx' table\n" ));
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GXV_INIT;
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GXV_LIMIT_CHECK( 4 + 4 );
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version = FT_NEXT_ULONG( p );
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nChains = FT_NEXT_ULONG( p );
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if ( version != 0x00020000UL )
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FT_INVALID_FORMAT;
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for ( i = 0; i < nChains; i++ )
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{
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GXV_TRACE(( "validating chain %lu/%lu\n", i + 1, nChains ));
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GXV_32BIT_ALIGNMENT_VALIDATE( p - table );
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gxv_morx_chain_validate( p, limit, gxvalid );
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p += gxvalid->subtable_length;
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}
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FT_TRACE4(( "\n" ));
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}
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/* END */
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