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/***************************************************************************/ |
/* */ |
/* gxvmort.c */ |
/* */ |
/* TrueTypeGX/AAT mort table validation (body). */ |
/* */ |
/* Copyright 2005, 2013 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. */ |
/* */ |
/***************************************************************************/ |
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/***************************************************************************/ |
/* */ |
/* gxvalid is derived from both gxlayout module and otvalid module. */ |
/* Development of gxlayout is supported by the Information-technology */ |
/* Promotion Agency(IPA), Japan. */ |
/* */ |
/***************************************************************************/ |
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#include "gxvmort.h" |
#include "gxvfeat.h" |
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/*************************************************************************/ |
/* */ |
/* 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 |
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static void |
gxv_mort_feature_validate( GXV_mort_feature f, |
GXV_Validator valid ) |
{ |
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; |
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/* 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 ); |
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GXV_TRACE(( "featureType %d is registered", f->featureType )); |
GXV_TRACE(( "setting %d", f->featureSetting )); |
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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" )); |
} |
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/* TODO: enableFlags must be unique value in specified chain? */ |
} |
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/* |
* 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 valid ) |
{ |
FT_Bytes p = table; |
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" ); |
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 ); |
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gxv_mort_feature_validate( &f, valid ); |
} |
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if ( !IS_GXV_MORT_FEATURE_OFF( f ) ) |
FT_INVALID_DATA; |
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valid->subtable_length = p - table; |
GXV_EXIT; |
} |
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FT_LOCAL_DEF( void ) |
gxv_mort_coverage_validate( FT_UShort coverage, |
GXV_Validator valid ) |
{ |
FT_UNUSED( valid ); |
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if ( coverage & 0x8000U ) |
GXV_TRACE(( " this subtable is for vertical text only\n" )); |
else |
GXV_TRACE(( " this subtable is for horizontal text only\n" )); |
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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" )); |
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if ( coverage & 0x2000 ) |
GXV_TRACE(( " this subtable is forcibly applied to " |
"vertical/horizontal text\n" )); |
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if ( coverage & 0x1FF8 ) |
GXV_TRACE(( " coverage has non-zero bits in reserved area\n" )); |
} |
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static void |
gxv_mort_subtables_validate( FT_Bytes table, |
FT_Bytes limit, |
FT_UShort nSubtables, |
GXV_Validator valid ) |
{ |
FT_Bytes p = table; |
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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 */ |
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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++ ) |
{ |
GXV_Validate_Func func; |
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FT_UShort length; |
FT_UShort coverage; |
#ifdef GXV_LOAD_UNUSED_VARS |
FT_ULong subFeatureFlags; |
#endif |
FT_UInt type; |
FT_UInt rest; |
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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 |
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GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n", |
i + 1, nSubtables, length )); |
type = coverage & 0x0007; |
rest = length - ( 2 + 2 + 4 ); |
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GXV_LIMIT_CHECK( rest ); |
gxv_mort_coverage_validate( coverage, valid ); |
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if ( type > 5 ) |
FT_INVALID_FORMAT; |
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func = fmt_funcs_table[type]; |
if ( func == NULL ) |
GXV_TRACE(( "morx type %d is reserved\n", type )); |
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func( p, p + rest, valid ); |
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p += rest; |
/* TODO: validate subFeatureFlags */ |
} |
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valid->subtable_length = p - table; |
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GXV_EXIT; |
} |
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static void |
gxv_mort_chain_validate( FT_Bytes table, |
FT_Bytes limit, |
GXV_Validator valid ) |
{ |
FT_Bytes p = table; |
#ifdef GXV_LOAD_UNUSED_VARS |
FT_ULong defaultFlags; |
#endif |
FT_ULong chainLength; |
FT_UShort nFeatureFlags; |
FT_UShort nSubtables; |
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GXV_NAME_ENTER( "mort chain header" ); |
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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 ); |
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gxv_mort_featurearray_validate( p, table + chainLength, |
nFeatureFlags, valid ); |
p += valid->subtable_length; |
gxv_mort_subtables_validate( p, table + chainLength, nSubtables, valid ); |
valid->subtable_length = chainLength; |
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/* TODO: validate defaultFlags */ |
GXV_EXIT; |
} |
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FT_LOCAL_DEF( void ) |
gxv_mort_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; |
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valid->root = ftvalid; |
valid->face = face; |
limit = valid->root->limit; |
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FT_TRACE3(( "validating `mort' table\n" )); |
GXV_INIT; |
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GXV_LIMIT_CHECK( 4 + 4 ); |
version = FT_NEXT_ULONG( p ); |
nChains = FT_NEXT_ULONG( p ); |
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if (version != 0x00010000UL) |
FT_INVALID_FORMAT; |
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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, valid ); |
p += valid->subtable_length; |
} |
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FT_TRACE4(( "\n" )); |
} |
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/* END */ |