ref: df2a7cd198dfc2b906c071e3ba95e3d19e5fedae
dir: /src/otvalid/otvgdef.c/
/***************************************************************************/
/* */
/* otvgdef.c */
/* */
/* OpenType GDEF table validation (body). */
/* */
/* Copyright 2004-2017 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 */