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-rw-r--r--src/gxvalid/gxvfeat.c343
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diff --git a/src/gxvalid/gxvfeat.c b/src/gxvalid/gxvfeat.c
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+/***************************************************************************/
+/* */
+/* gxvfeat.c */
+/* */
+/* TrueTypeGX/AAT feat table validation (body). */
+/* */
+/* Copyright 2004, 2005 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"
+#include "gxvfeat.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_gxvfeat
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** Data and Types *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ typedef struct GXV_feat_DataRec_
+ {
+ FT_UInt reserved_size;
+ FT_UShort feature;
+ FT_UShort setting;
+
+ } GXV_feat_DataRec, *GXV_feat_Data;
+
+
+#define GXV_FEAT_DATA( field ) GXV_TABLE_DATA( feat, field )
+
+
+ typedef enum
+ {
+ GXV_FEAT_MASK_EXCLUSIVE_SETTINGS = 0x8000U,
+ GXV_FEAT_MASK_DYNAMIC_DEFAULT = 0x4000,
+ GXV_FEAT_MASK_UNUSED = 0x3F00,
+ GXV_FEAT_MASK_DEFAULT_SETTING = 0x00FF
+
+ } GXV_FeatureFlagsMask;
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** UTILITY FUNCTIONS *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ static void
+ gxv_feat_registry_validate( FT_UShort feature,
+ FT_UShort nSettings,
+ FT_Bool exclusive,
+ GXV_Validator valid )
+ {
+ GXV_NAME_ENTER( "feature in registry" );
+
+ GXV_TRACE(( " (feature = %u)\n", feature ));
+
+ if ( feature >= gxv_feat_registry_length )
+ {
+ GXV_TRACE(( "feature number %d is out of range %d\n",
+ feature, gxv_feat_registry_length ));
+ if ( valid->root->level == FT_VALIDATE_PARANOID )
+ FT_INVALID_DATA;
+ goto Exit;
+ }
+
+ if ( gxv_feat_registry[feature].existence == 0 )
+ {
+ GXV_TRACE(( "feature number %d is in defined range but doesn't exist\n",
+ feature ));
+ if ( valid->root->level == FT_VALIDATE_PARANOID )
+ FT_INVALID_DATA;
+ goto Exit;
+ }
+
+ if ( gxv_feat_registry[feature].apple_reserved )
+ {
+ /* Don't use here. Apple is reserved. */
+ GXV_TRACE(( "feature number %d is reserved by Apple\n", feature ));
+ if ( valid->root->level >= FT_VALIDATE_TIGHT )
+ FT_INVALID_DATA;
+ }
+
+ if ( nSettings != gxv_feat_registry[feature].nSettings )
+ {
+ GXV_TRACE(( "feature %d: nSettings %d != defined nSettings %d\n",
+ feature, nSettings,
+ gxv_feat_registry[feature].nSettings ));
+ if ( valid->root->level >= FT_VALIDATE_TIGHT )
+ FT_INVALID_DATA;
+ }
+
+ if ( exclusive != gxv_feat_registry[feature].exclusive )
+ {
+ GXV_TRACE(( "exclusive flag %d differs from predefined value\n",
+ exclusive ));
+ if ( valid->root->level >= FT_VALIDATE_TIGHT )
+ FT_INVALID_DATA;
+ }
+
+ Exit:
+ GXV_EXIT;
+ }
+
+
+ static void
+ gxv_feat_name_index_validate( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+
+ FT_Short nameIndex;
+
+
+ GXV_NAME_ENTER( "nameIndex" );
+
+ GXV_LIMIT_CHECK( 2 );
+ nameIndex = FT_NEXT_SHORT ( p );
+ GXV_TRACE(( " (nameIndex = %d)\n", nameIndex ));
+
+ gxv_sfntName_validate( (FT_UShort)nameIndex,
+ 255,
+ 32768U,
+ valid );
+
+ GXV_EXIT;
+ }
+
+
+ static void
+ gxv_feat_setting_validate( FT_Bytes table,
+ FT_Bytes limit,
+ FT_Bool exclusive,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+ FT_UShort setting;
+
+
+ GXV_NAME_ENTER( "setting" );
+
+ GXV_LIMIT_CHECK( 2 );
+
+ setting = FT_NEXT_USHORT( p );
+
+ /* If we have exclusive setting, the setting should be odd. */
+ if ( exclusive && ( setting % 2 ) == 0 )
+ FT_INVALID_DATA;
+
+ gxv_feat_name_index_validate( p, limit, valid );
+
+ GXV_FEAT_DATA( setting ) = setting;
+
+ GXV_EXIT;
+ }
+
+
+ static void
+ gxv_feat_name_validate( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+ FT_UInt reserved_size = GXV_FEAT_DATA( reserved_size );
+
+ FT_UShort feature;
+ FT_UShort nSettings;
+ FT_UInt settingTable;
+ FT_UShort featureFlags;
+
+ FT_Bool exclusive;
+ FT_Int last_setting;
+ FT_UInt i;
+
+
+ GXV_NAME_ENTER( "name" );
+
+ /* feature + nSettings + settingTable + featureFlags */
+ GXV_LIMIT_CHECK( 2 + 2 + 4 + 2 );
+
+ feature = FT_NEXT_USHORT( p );
+ GXV_FEAT_DATA( feature ) = feature;
+
+ nSettings = FT_NEXT_USHORT( p );
+ settingTable = FT_NEXT_ULONG ( p );
+ featureFlags = FT_NEXT_USHORT( p );
+
+ if ( settingTable < reserved_size )
+ FT_INVALID_OFFSET;
+
+ if ( valid->root->level == FT_VALIDATE_PARANOID &&
+ ( featureFlags & GXV_FEAT_MASK_UNUSED ) == 0 )
+ FT_INVALID_DATA;
+
+ exclusive = FT_BOOL( featureFlags & GXV_FEAT_MASK_EXCLUSIVE_SETTINGS );
+ if ( exclusive )
+ {
+ FT_Byte dynamic_default;
+
+
+ if ( featureFlags & GXV_FEAT_MASK_DYNAMIC_DEFAULT )
+ dynamic_default = (FT_Byte)( featureFlags &
+ GXV_FEAT_MASK_DEFAULT_SETTING );
+ else
+ dynamic_default = 0;
+
+ /* If exclusive, check whether default setting is in the range. */
+ if ( !( dynamic_default < nSettings ) )
+ FT_INVALID_FORMAT;
+ }
+
+ gxv_feat_registry_validate( feature, nSettings, exclusive, valid );
+
+ gxv_feat_name_index_validate( p, limit, valid );
+
+ p = valid->root->base + settingTable;
+ for ( last_setting = -1, i = 0; i < nSettings; i++ )
+ {
+ gxv_feat_setting_validate( p, limit, exclusive, valid );
+
+ if ( valid->root->level == FT_VALIDATE_PARANOID &&
+ (FT_Int)GXV_FEAT_DATA( setting ) <= last_setting )
+ FT_INVALID_FORMAT;
+
+ last_setting = (FT_Int)GXV_FEAT_DATA( setting );
+ /* setting + nameIndex */
+ p += ( 2 + 2 );
+ }
+
+ GXV_EXIT;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** feat TABLE *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ FT_LOCAL_DEF( void )
+ gxv_feat_validate( FT_Bytes table,
+ FT_Face face,
+ FT_Validator ftvalid )
+ {
+ GXV_ValidatorRec validrec;
+ GXV_Validator valid = &validrec;
+
+ GXV_feat_DataRec featrec;
+ GXV_feat_Data feat = &featrec;
+
+ FT_Bytes p = table;
+ FT_Bytes limit = 0;
+
+ FT_UInt featureNameCount;
+
+ FT_UInt i;
+ FT_Int last_feature;
+
+
+ valid->root = ftvalid;
+ valid->table_data = feat;
+ valid->face = face;
+
+ FT_TRACE3(( "validating `feat' table\n" ));
+ GXV_INIT;
+
+ feat->reserved_size = 0;
+
+ /* version + featureNameCount + none_0 + none_1 */
+ GXV_LIMIT_CHECK( 4 + 2 + 2 + 4 );
+ feat->reserved_size += 4 + 2 + 2 + 4;
+
+ if ( FT_NEXT_ULONG( p ) != 0x00010000UL ) /* Version */
+ FT_INVALID_FORMAT;
+
+ featureNameCount = FT_NEXT_USHORT( p );
+ GXV_TRACE(( " (featureNameCount = %d)\n", featureNameCount ));
+
+ if ( valid->root->level != FT_VALIDATE_PARANOID )
+ p += 6; /* skip (none) and (none) */
+ else
+ {
+ if ( FT_NEXT_USHORT( p ) != 0 )
+ FT_INVALID_DATA;
+
+ if ( FT_NEXT_ULONG( p ) != 0 )
+ FT_INVALID_DATA;
+ }
+
+ feat->reserved_size += featureNameCount * ( 2 + 2 + 4 + 2 + 2 );
+
+ for ( last_feature = -1, i = 0; i < featureNameCount; i++ )
+ {
+ gxv_feat_name_validate( p, limit, valid );
+
+ if ( valid->root->level == FT_VALIDATE_PARANOID &&
+ (FT_Int)GXV_FEAT_DATA( feature ) <= last_feature )
+ FT_INVALID_FORMAT;
+
+ last_feature = GXV_FEAT_DATA( feature );
+ p += 2 + 2 + 4 + 2 + 2;
+ }
+
+ FT_TRACE4(( "\n" ));
+ }
+
+
+/* END */
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