300 lines
9.2 KiB
C
300 lines
9.2 KiB
C
/***************************************************************************/
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/* */
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/* gxvmort.c */
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/* */
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/* TrueTypeGX/AAT mort table validation (body). */
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/* */
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/* Copyright 2005 by 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 "gxvmort.h"
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#include "gxvfeat.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 trace_gxvmort
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static void
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gxv_mort_feature_validate( GXV_mort_feature f,
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GXV_Validator valid )
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{
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if ( f->featureType >= gxv_feat_registry_length )
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{
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GXV_TRACE(( "featureType %d is out of registered range, "
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"setting %d is unchecked\n",
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f->featureType, f->featureSetting ));
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if ( valid->root->level >= FT_VALIDATE_PARANOID )
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FT_INVALID_DATA;
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}
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else if ( !gxv_feat_registry[f->featureType].existence )
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{
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GXV_TRACE(( "featureType %d is within registered area "
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"but undefined, setting %d is unchecked\n",
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f->featureType, f->featureSetting ));
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if ( valid->root->level >= FT_VALIDATE_PARANOID )
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FT_INVALID_DATA;
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}
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else
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{
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FT_Byte nSettings_max;
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/* nSettings in gxvfeat.c is halved for exclusive on/off settings */
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nSettings_max = gxv_feat_registry[f->featureType].nSettings;
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if ( gxv_feat_registry[f->featureType].exclusive )
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nSettings_max = (FT_Byte)( 2 * nSettings_max );
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GXV_TRACE(( "featureType %d is registered", f->featureType ));
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GXV_TRACE(( "setting %d", f->featureSetting ));
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if ( f->featureSetting > nSettings_max )
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{
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GXV_TRACE(( "out of defined range %d", nSettings_max ));
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if ( valid->root->level >= FT_VALIDATE_PARANOID )
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FT_INVALID_DATA;
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}
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GXV_TRACE(( "\n" ));
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}
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/* TODO: enableFlags must be unique value in specified chain? */
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}
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/*
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* nFeatureFlags is typed to FT_ULong to accept that in
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* mort (typed FT_UShort) and morx (typed FT_ULong).
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*/
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FT_LOCAL_DEF( void )
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gxv_mort_featurearray_validate( FT_Bytes table,
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FT_Bytes limit,
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FT_ULong nFeatureFlags,
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GXV_Validator valid )
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{
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FT_Bytes p = table;
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FT_ULong i;
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GXV_mort_featureRec f = GXV_MORT_FEATURE_OFF;
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GXV_NAME_ENTER( "mort feature list" );
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for ( i = 0; i < nFeatureFlags; i++ )
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{
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GXV_LIMIT_CHECK( 2 + 2 + 4 + 4 );
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f.featureType = FT_NEXT_USHORT( p );
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f.featureSetting = FT_NEXT_USHORT( p );
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f.enableFlags = FT_NEXT_ULONG( p );
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f.disableFlags = FT_NEXT_ULONG( p );
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gxv_mort_feature_validate( &f, valid );
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}
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if ( !IS_GXV_MORT_FEATURE_OFF( f ) )
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FT_INVALID_DATA;
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valid->subtable_length = p - table;
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GXV_EXIT;
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}
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FT_LOCAL_DEF( void )
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gxv_mort_coverage_validate( FT_UShort coverage,
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GXV_Validator valid )
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{
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FT_UNUSED( valid );
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if ( coverage & 0x8000U )
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GXV_TRACE(( " this subtable is for vertical text only\n" ));
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else
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GXV_TRACE(( " this subtable is for horizontal text only\n" ));
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if ( coverage & 0x4000 )
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GXV_TRACE(( " this subtable is applied to glyph array "
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"in descending order\n" ));
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else
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GXV_TRACE(( " this subtable is applied to glyph array "
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"in ascending order\n" ));
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if ( coverage & 0x2000 )
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GXV_TRACE(( " this subtable is forcibly applied to "
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"vertical/horizontal text\n" ));
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if ( coverage & 0x1FF8 )
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GXV_TRACE(( " coverage has non-zero bits in reserved area\n" ));
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}
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static void
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gxv_mort_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 valid )
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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_mort_subtable_type0_validate, /* 0 */
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gxv_mort_subtable_type1_validate, /* 1 */
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gxv_mort_subtable_type2_validate, /* 2 */
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NULL, /* 3 */
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gxv_mort_subtable_type4_validate, /* 4 */
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gxv_mort_subtable_type5_validate, /* 5 */
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};
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GXV_Validate_Func func;
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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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FT_UShort length;
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FT_UShort 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_UInt type;
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FT_UInt rest;
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GXV_LIMIT_CHECK( 2 + 2 + 4 );
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length = FT_NEXT_USHORT( p );
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coverage = FT_NEXT_USHORT( 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 (%d bytes)\n",
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i + 1, nSubtables, length ));
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type = coverage & 0x0007;
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rest = length - ( 2 + 2 + 4 );
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GXV_LIMIT_CHECK( rest );
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gxv_mort_coverage_validate( coverage, valid );
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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 == NULL )
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GXV_TRACE(( "morx type %d is reserved\n", type ));
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func( p, p + rest, valid );
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p += rest;
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/* TODO: validate subFeatureFlags */
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}
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valid->subtable_length = p - table;
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GXV_EXIT;
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}
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static void
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gxv_mort_chain_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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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_UShort nFeatureFlags;
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FT_UShort nSubtables;
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GXV_NAME_ENTER( "mort chain header" );
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GXV_LIMIT_CHECK( 4 + 4 + 2 + 2 );
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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_USHORT( p );
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nSubtables = FT_NEXT_USHORT( p );
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gxv_mort_featurearray_validate( p, table + chainLength,
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nFeatureFlags, valid );
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p += valid->subtable_length;
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gxv_mort_subtables_validate( p, table + chainLength, nSubtables, valid );
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valid->subtable_length = chainLength;
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/* TODO: validate defaultFlags */
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GXV_EXIT;
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}
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FT_LOCAL_DEF( void )
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gxv_mort_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 validrec;
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GXV_Validator valid = &validrec;
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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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valid->root = ftvalid;
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valid->face = face;
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limit = valid->root->limit;
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FT_TRACE3(( "validating `mort' 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 != 0x00010000UL)
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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 %d/%d\n", i + 1, nChains ));
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GXV_32BIT_ALIGNMENT_VALIDATE( p - table );
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gxv_mort_chain_validate( p, limit, valid );
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p += valid->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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