/***************************************************************************/ | |
/* */ | |
/* otvgdef.c */ | |
/* */ | |
/* OpenType GDEF table validation (body). */ | |
/* */ | |
/* Copyright 2004-2015 by */ | |
/* 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. */ | |
/* */ | |
/***************************************************************************/ | |
#include "otvalid.h" | |
#include "otvcommn.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_otvgdef | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** UTILITY FUNCTIONS *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
#define AttachListFunc otv_O_x_Ox | |
#define LigCaretListFunc otv_O_x_Ox | |
/* sets valid->extra1 (0) */ | |
static void | |
otv_O_x_Ox( FT_Bytes table, | |
OTV_Validator otvalid ) | |
{ | |
FT_Bytes p = table; | |
FT_Bytes Coverage; | |
FT_UInt GlyphCount; | |
OTV_Validate_Func func; | |
OTV_ENTER; | |
OTV_LIMIT_CHECK( 4 ); | |
Coverage = table + FT_NEXT_USHORT( p ); | |
GlyphCount = FT_NEXT_USHORT( p ); | |
OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); | |
otv_Coverage_validate( Coverage, otvalid, (FT_Int)GlyphCount ); | |
if ( GlyphCount != otv_Coverage_get_count( Coverage ) ) | |
FT_INVALID_DATA; | |
OTV_LIMIT_CHECK( GlyphCount * 2 ); | |
otvalid->nesting_level++; | |
func = otvalid->func[otvalid->nesting_level]; | |
otvalid->extra1 = 0; | |
for ( ; GlyphCount > 0; GlyphCount-- ) | |
func( table + FT_NEXT_USHORT( p ), otvalid ); | |
otvalid->nesting_level--; | |
OTV_EXIT; | |
} | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** LIGATURE CARETS *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
#define CaretValueFunc otv_CaretValue_validate | |
static void | |
otv_CaretValue_validate( FT_Bytes table, | |
OTV_Validator otvalid ) | |
{ | |
FT_Bytes p = table; | |
FT_UInt CaretValueFormat; | |
OTV_ENTER; | |
OTV_LIMIT_CHECK( 4 ); | |
CaretValueFormat = FT_NEXT_USHORT( p ); | |
OTV_TRACE(( " (format = %d)\n", CaretValueFormat )); | |
switch ( CaretValueFormat ) | |
{ | |
case 1: /* CaretValueFormat1 */ | |
/* skip Coordinate, no test */ | |
break; | |
case 2: /* CaretValueFormat2 */ | |
/* skip CaretValuePoint, no test */ | |
break; | |
case 3: /* CaretValueFormat3 */ | |
p += 2; /* skip Coordinate */ | |
OTV_LIMIT_CHECK( 2 ); | |
/* DeviceTable */ | |
otv_Device_validate( table + FT_NEXT_USHORT( p ), otvalid ); | |
break; | |
default: | |
FT_INVALID_FORMAT; | |
} | |
OTV_EXIT; | |
} | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** GDEF TABLE *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/* sets otvalid->glyph_count */ | |
FT_LOCAL_DEF( void ) | |
otv_GDEF_validate( FT_Bytes table, | |
FT_Bytes gsub, | |
FT_Bytes gpos, | |
FT_UInt glyph_count, | |
FT_Validator ftvalid ) | |
{ | |
OTV_ValidatorRec otvalidrec; | |
OTV_Validator otvalid = &otvalidrec; | |
FT_Bytes p = table; | |
FT_UInt table_size; | |
FT_Bool need_MarkAttachClassDef; | |
OTV_OPTIONAL_TABLE( GlyphClassDef ); | |
OTV_OPTIONAL_TABLE( AttachListOffset ); | |
OTV_OPTIONAL_TABLE( LigCaretListOffset ); | |
OTV_OPTIONAL_TABLE( MarkAttachClassDef ); | |
otvalid->root = ftvalid; | |
FT_TRACE3(( "validating GDEF table\n" )); | |
OTV_INIT; | |
OTV_LIMIT_CHECK( 12 ); | |
if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ | |
FT_INVALID_FORMAT; | |
/* MarkAttachClassDef has been added to the OpenType */ | |
/* specification without increasing GDEF's version, */ | |
/* so we use this ugly hack to find out whether the */ | |
/* table is needed actually. */ | |
need_MarkAttachClassDef = FT_BOOL( | |
otv_GSUBGPOS_have_MarkAttachmentType_flag( gsub ) || | |
otv_GSUBGPOS_have_MarkAttachmentType_flag( gpos ) ); | |
if ( need_MarkAttachClassDef ) | |
table_size = 12; /* OpenType >= 1.2 */ | |
else | |
table_size = 10; /* OpenType < 1.2 */ | |
otvalid->glyph_count = glyph_count; | |
OTV_OPTIONAL_OFFSET( GlyphClassDef ); | |
OTV_SIZE_CHECK( GlyphClassDef ); | |
if ( GlyphClassDef ) | |
otv_ClassDef_validate( table + GlyphClassDef, otvalid ); | |
OTV_OPTIONAL_OFFSET( AttachListOffset ); | |
OTV_SIZE_CHECK( AttachListOffset ); | |
if ( AttachListOffset ) | |
{ | |
OTV_NEST2( AttachList, AttachPoint ); | |
OTV_RUN( table + AttachListOffset, otvalid ); | |
} | |
OTV_OPTIONAL_OFFSET( LigCaretListOffset ); | |
OTV_SIZE_CHECK( LigCaretListOffset ); | |
if ( LigCaretListOffset ) | |
{ | |
OTV_NEST3( LigCaretList, LigGlyph, CaretValue ); | |
OTV_RUN( table + LigCaretListOffset, otvalid ); | |
} | |
if ( need_MarkAttachClassDef ) | |
{ | |
OTV_OPTIONAL_OFFSET( MarkAttachClassDef ); | |
OTV_SIZE_CHECK( MarkAttachClassDef ); | |
if ( MarkAttachClassDef ) | |
otv_ClassDef_validate( table + MarkAttachClassDef, otvalid ); | |
} | |
FT_TRACE4(( "\n" )); | |
} | |
/* END */ |