/***************************************************************************/ | |
/* */ | |
/* gxvmort.c */ | |
/* */ | |
/* TrueTypeGX/AAT mort table validation (body). */ | |
/* */ | |
/* Copyright 2005-2015 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" | |
#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_gxvmort | |
static void | |
gxv_mort_feature_validate( GXV_mort_feature f, | |
GXV_Validator gxvalid ) | |
{ | |
if ( f->featureType >= gxv_feat_registry_length ) | |
{ | |
GXV_TRACE(( "featureType %d is out of registered range, " | |
"setting %d is unchecked\n", | |
f->featureType, f->featureSetting )); | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); | |
} | |
else if ( !gxv_feat_registry[f->featureType].existence ) | |
{ | |
GXV_TRACE(( "featureType %d is within registered area " | |
"but undefined, setting %d is unchecked\n", | |
f->featureType, f->featureSetting )); | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); | |
} | |
else | |
{ | |
FT_Byte nSettings_max; | |
/* nSettings in gxvfeat.c is halved for exclusive on/off settings */ | |
nSettings_max = gxv_feat_registry[f->featureType].nSettings; | |
if ( gxv_feat_registry[f->featureType].exclusive ) | |
nSettings_max = (FT_Byte)( 2 * nSettings_max ); | |
GXV_TRACE(( "featureType %d is registered", f->featureType )); | |
GXV_TRACE(( "setting %d", f->featureSetting )); | |
if ( f->featureSetting > nSettings_max ) | |
{ | |
GXV_TRACE(( "out of defined range %d", nSettings_max )); | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); | |
} | |
GXV_TRACE(( "\n" )); | |
} | |
/* TODO: enableFlags must be unique value in specified chain? */ | |
} | |
/* | |
* nFeatureFlags is typed to FT_ULong to accept that in | |
* mort (typed FT_UShort) and morx (typed FT_ULong). | |
*/ | |
FT_LOCAL_DEF( void ) | |
gxv_mort_featurearray_validate( FT_Bytes table, | |
FT_Bytes limit, | |
FT_ULong nFeatureFlags, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
FT_ULong i; | |
GXV_mort_featureRec f = GXV_MORT_FEATURE_OFF; | |
GXV_NAME_ENTER( "mort feature list" ); | |
for ( i = 0; i < nFeatureFlags; i++ ) | |
{ | |
GXV_LIMIT_CHECK( 2 + 2 + 4 + 4 ); | |
f.featureType = FT_NEXT_USHORT( p ); | |
f.featureSetting = FT_NEXT_USHORT( p ); | |
f.enableFlags = FT_NEXT_ULONG( p ); | |
f.disableFlags = FT_NEXT_ULONG( p ); | |
gxv_mort_feature_validate( &f, gxvalid ); | |
} | |
if ( !IS_GXV_MORT_FEATURE_OFF( f ) ) | |
FT_INVALID_DATA; | |
gxvalid->subtable_length = (FT_ULong)( p - table ); | |
GXV_EXIT; | |
} | |
FT_LOCAL_DEF( void ) | |
gxv_mort_coverage_validate( FT_UShort coverage, | |
GXV_Validator gxvalid ) | |
{ | |
FT_UNUSED( gxvalid ); | |
#ifdef FT_DEBUG_LEVEL_TRACE | |
if ( coverage & 0x8000U ) | |
GXV_TRACE(( " this subtable is for vertical text only\n" )); | |
else | |
GXV_TRACE(( " this subtable is for horizontal text only\n" )); | |
if ( coverage & 0x4000 ) | |
GXV_TRACE(( " this subtable is applied to glyph array " | |
"in descending order\n" )); | |
else | |
GXV_TRACE(( " this subtable is applied to glyph array " | |
"in ascending order\n" )); | |
if ( coverage & 0x2000 ) | |
GXV_TRACE(( " this subtable is forcibly applied to " | |
"vertical/horizontal text\n" )); | |
if ( coverage & 0x1FF8 ) | |
GXV_TRACE(( " coverage has non-zero bits in reserved area\n" )); | |
#endif | |
} | |
static void | |
gxv_mort_subtables_validate( FT_Bytes table, | |
FT_Bytes limit, | |
FT_UShort nSubtables, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
GXV_Validate_Func fmt_funcs_table[] = | |
{ | |
gxv_mort_subtable_type0_validate, /* 0 */ | |
gxv_mort_subtable_type1_validate, /* 1 */ | |
gxv_mort_subtable_type2_validate, /* 2 */ | |
NULL, /* 3 */ | |
gxv_mort_subtable_type4_validate, /* 4 */ | |
gxv_mort_subtable_type5_validate, /* 5 */ | |
}; | |
FT_UShort i; | |
GXV_NAME_ENTER( "subtables in a chain" ); | |
for ( i = 0; i < nSubtables; i++ ) | |
{ | |
GXV_Validate_Func func; | |
FT_UShort length; | |
FT_UShort coverage; | |
#ifdef GXV_LOAD_UNUSED_VARS | |
FT_ULong subFeatureFlags; | |
#endif | |
FT_UInt type; | |
FT_UInt rest; | |
GXV_LIMIT_CHECK( 2 + 2 + 4 ); | |
length = FT_NEXT_USHORT( p ); | |
coverage = FT_NEXT_USHORT( p ); | |
#ifdef GXV_LOAD_UNUSED_VARS | |
subFeatureFlags = FT_NEXT_ULONG( p ); | |
#else | |
p += 4; | |
#endif | |
GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n", | |
i + 1, nSubtables, length )); | |
type = coverage & 0x0007; | |
rest = length - ( 2 + 2 + 4 ); | |
GXV_LIMIT_CHECK( rest ); | |
gxv_mort_coverage_validate( coverage, gxvalid ); | |
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, gxvalid ); | |
p += rest; | |
/* TODO: validate subFeatureFlags */ | |
} | |
gxvalid->subtable_length = (FT_ULong)( p - table ); | |
GXV_EXIT; | |
} | |
static void | |
gxv_mort_chain_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
#ifdef GXV_LOAD_UNUSED_VARS | |
FT_ULong defaultFlags; | |
#endif | |
FT_ULong chainLength; | |
FT_UShort nFeatureFlags; | |
FT_UShort nSubtables; | |
GXV_NAME_ENTER( "mort chain header" ); | |
GXV_LIMIT_CHECK( 4 + 4 + 2 + 2 ); | |
#ifdef GXV_LOAD_UNUSED_VARS | |
defaultFlags = FT_NEXT_ULONG( p ); | |
#else | |
p += 4; | |
#endif | |
chainLength = FT_NEXT_ULONG( p ); | |
nFeatureFlags = FT_NEXT_USHORT( p ); | |
nSubtables = FT_NEXT_USHORT( p ); | |
gxv_mort_featurearray_validate( p, table + chainLength, | |
nFeatureFlags, gxvalid ); | |
p += gxvalid->subtable_length; | |
gxv_mort_subtables_validate( p, table + chainLength, nSubtables, gxvalid ); | |
gxvalid->subtable_length = chainLength; | |
/* TODO: validate defaultFlags */ | |
GXV_EXIT; | |
} | |
FT_LOCAL_DEF( void ) | |
gxv_mort_validate( FT_Bytes table, | |
FT_Face face, | |
FT_Validator ftvalid ) | |
{ | |
GXV_ValidatorRec gxvalidrec; | |
GXV_Validator gxvalid = &gxvalidrec; | |
FT_Bytes p = table; | |
FT_Bytes limit = 0; | |
FT_ULong version; | |
FT_ULong nChains; | |
FT_ULong i; | |
gxvalid->root = ftvalid; | |
gxvalid->face = face; | |
limit = gxvalid->root->limit; | |
FT_TRACE3(( "validating `mort' table\n" )); | |
GXV_INIT; | |
GXV_LIMIT_CHECK( 4 + 4 ); | |
version = FT_NEXT_ULONG( p ); | |
nChains = FT_NEXT_ULONG( p ); | |
if (version != 0x00010000UL) | |
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_mort_chain_validate( p, limit, gxvalid ); | |
p += gxvalid->subtable_length; | |
} | |
FT_TRACE4(( "\n" )); | |
} | |
/* END */ |