ref: 0880ac333a2bde53d6bd090b97bafadc7435ad58
dir: /src/gxvalid/gxvcommn.c/
/***************************************************************************/
/* */
/* gxvcommn.c */
/* */
/* TrueTypeGX/AAT common tables 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 "gxvcommn.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_gxvcommon
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** 16bit offset sorter *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static int
gxv_compare_ushort_offset( FT_UShort* a,
FT_UShort* b )
{
if ( *a < *b )
return ( -1 );
else if ( *a > *b )
return ( 1 );
else
return ( 0 );
}
FT_LOCAL_DEF( void )
gxv_set_length_by_ushort_offset( FT_UShort* offset,
FT_UShort** length,
FT_UShort* buff,
FT_UInt nmemb,
FT_UShort limit,
GXV_Validator valid )
{
FT_UInt i;
for ( i = 0; i < nmemb; i++ )
*(length[i]) = 0;
for ( i = 0; i < nmemb; i++ )
buff[i] = offset[i];
buff[nmemb] = limit;
ft_qsort( buff, ( nmemb + 1 ), sizeof ( FT_UShort ),
( int(*)(const void*, const void*) )gxv_compare_ushort_offset );
if ( buff[nmemb] > limit )
FT_INVALID_OFFSET;
for ( i = 0; i < nmemb; i++ )
{
FT_UInt j;
for ( j = 0; j < nmemb; j++ )
if ( buff[j] == offset[i] )
break;
if ( j == nmemb )
FT_INVALID_OFFSET;
*(length[i]) = (FT_UShort)( buff[j + 1] - buff[j] );
if ( 0 != offset[i] && 0 == *(length[i]) )
FT_INVALID_OFFSET;
}
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** 32bit offset sorter *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static int
gxv_compare_ulong_offset( FT_ULong* a,
FT_ULong* b )
{
if ( *a < *b )
return ( -1 );
else if ( *a > *b )
return ( 1 );
else
return ( 0 );
}
FT_LOCAL_DEF( void )
gxv_set_length_by_ulong_offset( FT_ULong* offset,
FT_ULong** length,
FT_ULong* buff,
FT_UInt nmemb,
FT_ULong limit,
GXV_Validator valid)
{
FT_UInt i;
for ( i = 0; i < nmemb; i++ )
*(length[i]) = 0;
for ( i = 0; i < nmemb; i++ )
buff[i] = offset[i];
buff[nmemb] = limit;
ft_qsort( buff, ( nmemb + 1 ), sizeof ( FT_ULong ),
( int(*)(const void*, const void*) )gxv_compare_ulong_offset );
if ( buff[nmemb] > limit )
FT_INVALID_OFFSET;
for ( i = 0; i < nmemb; i++ )
{
FT_UInt j;
for ( j = 0; j < nmemb; j++ )
if ( buff[j] == offset[i] )
break;
if ( j == nmemb )
FT_INVALID_OFFSET;
*(length[i]) = buff[j + 1] - buff[j];
if ( 0 != offset[i] && 0 == *(length[i]) )
FT_INVALID_OFFSET;
}
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** scan value array and get min & max *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
gxv_array_getlimits_byte( FT_Bytes table,
FT_Bytes limit,
FT_Byte* min,
FT_Byte* max,
GXV_Validator valid )
{
FT_Bytes p = table;
*min = 0xFF;
*max = 0x00;
while ( p < limit )
{
FT_Byte val;
GXV_LIMIT_CHECK( 1 );
val = FT_NEXT_BYTE( p );
*min = (FT_Byte)FT_MIN( *min, val );
*max = (FT_Byte)FT_MAX( *max, val );
}
valid->subtable_length = p - table;
}
FT_LOCAL_DEF( void )
gxv_array_getlimits_ushort( FT_Bytes table,
FT_Bytes limit,
FT_UShort* min,
FT_UShort* max,
GXV_Validator valid )
{
FT_Bytes p = table;
*min = 0xFFFFU;
*max = 0x0000;
while ( p < limit )
{
FT_UShort val;
GXV_LIMIT_CHECK( 2 );
val = FT_NEXT_USHORT( p );
*min = (FT_Byte)FT_MIN( *min, val );
*max = (FT_Byte)FT_MAX( *max, val );
}
valid->subtable_length = p - table;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** BINSEARCHHEADER *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct GXV_BinSrchHeader_
{
FT_UShort unitSize;
FT_UShort nUnits;
FT_UShort searchRange;
FT_UShort entrySelector;
FT_UShort rangeShift;
} GXV_BinSrchHeader;
static void
gxv_BinSrchHeader_check_consistency( GXV_BinSrchHeader* binSrchHeader,
GXV_Validator valid )
{
FT_UShort searchRange;
FT_UShort entrySelector;
FT_UShort rangeShift;
if ( binSrchHeader->unitSize == 0 )
FT_INVALID_DATA;
if ( binSrchHeader->nUnits == 0 )
{
if ( binSrchHeader->searchRange == 0 &&
binSrchHeader->entrySelector == 0 &&
binSrchHeader->rangeShift == 0 )
return;
else
FT_INVALID_DATA;
}
for ( searchRange = 1, entrySelector = 1;
( searchRange * 2 ) <= binSrchHeader->nUnits &&
searchRange < 0x8000U;
searchRange *= 2, entrySelector++ )
;
entrySelector--;
searchRange = (FT_UShort)( searchRange * binSrchHeader->unitSize );
rangeShift = (FT_UShort)( binSrchHeader->nUnits * binSrchHeader->unitSize
- searchRange );
if ( searchRange != binSrchHeader->searchRange ||
entrySelector != binSrchHeader->entrySelector ||
rangeShift != binSrchHeader->rangeShift )
{
GXV_TRACE(( "Inconsistency found in BinSrchHeader\n" ));
GXV_TRACE(( "originally: unitSize=%d, nUnits=%d, "
"searchRange=%d, entrySelector=%d, "
"rangeShift=%d\n",
binSrchHeader->unitSize, binSrchHeader->nUnits,
binSrchHeader->searchRange, binSrchHeader->entrySelector,
binSrchHeader->rangeShift ));
GXV_TRACE(( "calculated: unitSize=%d, nUnits=%d, "
"searchRange=%d, entrySelector=%d, "
"rangeShift=%d\n",
binSrchHeader->unitSize, binSrchHeader->nUnits,
searchRange, entrySelector, rangeShift ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_DATA;
}
}
/*
* parser & validator of BinSrchHeader
* which is used in LookupTable format 2, 4, 6.
*
* Essential parameters (unitSize, nUnits) are returned by
* given pointer, others (searchRange, entrySelector, rangeShift)
* can be calculated by essential parameters, so they are just
* validated and discarded.
*
* However, wrong values in searchRange, entrySelector, rangeShift
* won't cause fatal errors, because these parameters might be
* only used in old m68k font driver in MacOS.
* -- suzuki toshiya <[email protected]>
*/
FT_LOCAL_DEF( void )
gxv_BinSrchHeader_validate( FT_Bytes table,
FT_Bytes limit,
FT_UShort* unitSize_p,
FT_UShort* nUnits_p,
GXV_Validator valid )
{
FT_Bytes p = table;
GXV_BinSrchHeader binSrchHeader;
GXV_NAME_ENTER( "BinSrchHeader validate" );
if ( *unitSize_p == 0 )
{
GXV_LIMIT_CHECK( 2 );
binSrchHeader.unitSize = FT_NEXT_USHORT( p );
}
else
binSrchHeader.unitSize = *unitSize_p;
if ( *nUnits_p == 0 )
{
GXV_LIMIT_CHECK( 2 );
binSrchHeader.nUnits = FT_NEXT_USHORT( p );
}
else
binSrchHeader.nUnits = *nUnits_p;
GXV_LIMIT_CHECK( 2 + 2 + 2 );
binSrchHeader.searchRange = FT_NEXT_USHORT( p );
binSrchHeader.entrySelector = FT_NEXT_USHORT( p );
binSrchHeader.rangeShift = FT_NEXT_USHORT( p );
GXV_TRACE(( "nUnits %d\n", binSrchHeader.nUnits ));
gxv_BinSrchHeader_check_consistency( &binSrchHeader, valid );
if ( *unitSize_p == 0 )
*unitSize_p = binSrchHeader.unitSize;
if ( *nUnits_p == 0 )
*nUnits_p = binSrchHeader.nUnits;
valid->subtable_length = p - table;
GXV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** LOOKUP TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define GXV_LOOKUP_VALUE_LOAD( P, SIGNSPEC ) \
( P += 2, gxv_lookup_value_load( P - 2, SIGNSPEC ) )
static GXV_LookupValueDesc
gxv_lookup_value_load( FT_Bytes p,
int signspec )
{
GXV_LookupValueDesc v;
if ( signspec == GXV_LOOKUPVALUE_UNSIGNED )
v.u = FT_NEXT_USHORT( p );
else
v.s = FT_NEXT_SHORT( p );
return v;
}
#define GXV_UNITSIZE_VALIDATE( FORMAT, UNITSIZE, NUNITS, CORRECTSIZE ) \
FT_BEGIN_STMNT \
if ( UNITSIZE != CORRECTSIZE ) \
{ \
FT_ERROR(( "unitSize=%d differs from" \
"expected unitSize=%d" \
"in LookupTable %s", \
UNITSIZE, CORRECTSIZE, FORMAT )); \
if ( UNITSIZE != 0 && NUNITS != 0 ) \
{ \
FT_ERROR(( " cannot validate anymore\n" )); \
FT_INVALID_FORMAT; \
} \
else \
FT_ERROR(( " forcibly continues\n" )); \
} \
FT_END_STMNT
/* ================= Simple Array Format 0 Lookup Table ================ */
static void
gxv_LookupTable_fmt0_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort i;
GXV_LookupValueDesc value;
GXV_NAME_ENTER( "LookupTable format 0" );
GXV_LIMIT_CHECK( 2 * valid->face->num_glyphs );
for ( i = 0; i < valid->face->num_glyphs; i++ )
{
GXV_LIMIT_CHECK( 2 );
if ( p + 2 >= limit ) /* some fonts have too-short fmt0 array */
{
GXV_TRACE(( "too short, glyphs %d - %d are missing\n",
i, valid->face->num_glyphs ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
break;
}
value = GXV_LOOKUP_VALUE_LOAD( p, valid->lookupval_sign );
valid->lookupval_func( i, value, valid );
}
valid->subtable_length = p - table;
GXV_EXIT;
}
/* ================= Segment Single Format 2 Loolup Table ============== */
/*
* Apple spec says:
*
* To guarantee that a binary search terminates, you must include one or
* more special `end of search table' values at the end of the data to
* be searched. The number of termination values that need to be
* included is table-specific. The value that indicates binary search
* termination is 0xFFFF.
*
* The problem is that nUnits does not include this end-marker. It's
* quite difficult to discriminate whether the following 0xFFFF comes from
* the end-marker or some next data.
*
* -- suzuki toshiya <[email protected]>
*/
static void
gxv_LookupTable_fmt2_skip_endmarkers( FT_Bytes table,
FT_UShort unitSize,
GXV_Validator valid )
{
FT_Bytes p = table;
while ( ( p + 4 ) < valid->root->limit )
{
if ( p[0] != 0xFF || p[1] != 0xFF || /* lastGlyph */
p[2] != 0xFF || p[3] != 0xFF ) /* firstGlyph */
break;
p += unitSize;
}
valid->subtable_length = p - table;
}
static void
gxv_LookupTable_fmt2_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort gid;
FT_UShort unitSize;
FT_UShort nUnits;
FT_UShort unit;
FT_UShort lastGlyph;
FT_UShort firstGlyph;
GXV_LookupValueDesc value;
GXV_NAME_ENTER( "LookupTable format 2" );
unitSize = nUnits = 0;
gxv_BinSrchHeader_validate( p, limit, &unitSize, &nUnits, valid );
p += valid->subtable_length;
GXV_UNITSIZE_VALIDATE( "format2", unitSize, nUnits, 6 );
for ( unit = 0, gid = 0; unit < nUnits; unit++ )
{
GXV_LIMIT_CHECK( 2 + 2 + 2 );
lastGlyph = FT_NEXT_USHORT( p );
firstGlyph = FT_NEXT_USHORT( p );
value = GXV_LOOKUP_VALUE_LOAD( p, valid->lookupval_sign );
gxv_glyphid_validate( firstGlyph, valid );
gxv_glyphid_validate( lastGlyph, valid );
if ( lastGlyph < gid )
{
GXV_TRACE(( "reverse ordered segment specification:"
" lastGlyph[%d]=%d < lastGlyph[%d]=%d\n",
unit, lastGlyph, unit - 1 , gid ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
}
if ( lastGlyph < firstGlyph )
{
GXV_TRACE(( "reverse ordered range specification at unit %d:",
" lastGlyph %d < firstGlyph %d ",
unit, lastGlyph, firstGlyph ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
if ( valid->root->level == FT_VALIDATE_TIGHT )
continue; /* ftxvalidator silently skips such an entry */
FT_TRACE4(( "continuing with exchanged values\n" ));
gid = firstGlyph;
firstGlyph = lastGlyph;
lastGlyph = gid;
}
for ( gid = firstGlyph; gid <= lastGlyph; gid++ )
valid->lookupval_func( gid, value, valid );
}
gxv_LookupTable_fmt2_skip_endmarkers( p, unitSize, valid );
p += valid->subtable_length;
valid->subtable_length = p - table;
GXV_EXIT;
}
/* ================= Segment Array Format 4 Lookup Table =============== */
static void
gxv_LookupTable_fmt4_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort unit;
FT_UShort gid;
FT_UShort unitSize;
FT_UShort nUnits;
FT_UShort lastGlyph;
FT_UShort firstGlyph;
GXV_LookupValueDesc base_value;
GXV_LookupValueDesc value;
GXV_NAME_ENTER( "LookupTable format 4" );
unitSize = nUnits = 0;
gxv_BinSrchHeader_validate( p, limit, &unitSize, &nUnits, valid );
p += valid->subtable_length;
GXV_UNITSIZE_VALIDATE( "format4", unitSize, nUnits, 6 );
for ( unit = 0, gid = 0; unit < nUnits; unit++ )
{
GXV_LIMIT_CHECK( 2 + 2 );
lastGlyph = FT_NEXT_USHORT( p );
firstGlyph = FT_NEXT_USHORT( p );
gxv_glyphid_validate( firstGlyph, valid );
gxv_glyphid_validate( lastGlyph, valid );
if ( lastGlyph < gid )
{
GXV_TRACE(( "reverse ordered segment specification:"
" lastGlyph[%d]=%d < lastGlyph[%d]=%d\n",
unit, lastGlyph, unit - 1 , gid ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
}
if ( lastGlyph < firstGlyph )
{
GXV_TRACE(( "reverse ordered range specification at unit %d:",
" lastGlyph %d < firstGlyph %d ",
unit, lastGlyph, firstGlyph ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
if ( valid->root->level == FT_VALIDATE_TIGHT )
continue; /* ftxvalidator silently skips such an entry */
FT_TRACE4(( "continuing with exchanged values\n" ));
gid = firstGlyph;
firstGlyph = lastGlyph;
lastGlyph = gid;
}
GXV_LIMIT_CHECK( 2 );
base_value = GXV_LOOKUP_VALUE_LOAD( p, GXV_LOOKUPVALUE_UNSIGNED );
for ( gid = firstGlyph; gid <= lastGlyph; gid++ )
{
value = valid->lookupfmt4_trans( (FT_UShort)( gid - firstGlyph ),
base_value,
limit,
valid );
valid->lookupval_func( gid, value, valid );
}
}
gxv_LookupTable_fmt2_skip_endmarkers( p, unitSize, valid );
p += valid->subtable_length;
valid->subtable_length = p - table;
GXV_EXIT;
}
/* ================= Segment Table Format 6 Lookup Table =============== */
static void
gxv_LookupTable_fmt6_skip_endmarkers( FT_Bytes table,
FT_UShort unitSize,
GXV_Validator valid )
{
FT_Bytes p = table;
while ( p < valid->root->limit )
{
if ( p[0] != 0xFF || p[1] != 0xFF )
break;
p += unitSize;
}
valid->subtable_length = p - table;
}
static void
gxv_LookupTable_fmt6_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort unit;
FT_UShort prev_glyph;
FT_UShort unitSize;
FT_UShort nUnits;
FT_UShort glyph;
GXV_LookupValueDesc value;
GXV_NAME_ENTER( "LookupTable format 6" );
unitSize = nUnits = 0;
gxv_BinSrchHeader_validate( p, limit, &unitSize, &nUnits, valid );
p += valid->subtable_length;
GXV_UNITSIZE_VALIDATE( "format6", unitSize, nUnits, 4 );
for ( unit = 0, prev_glyph = 0; unit < nUnits; unit++ )
{
GXV_LIMIT_CHECK( 2 + 2 );
glyph = FT_NEXT_USHORT( p );
value = GXV_LOOKUP_VALUE_LOAD( p, valid->lookupval_sign );
if ( gxv_glyphid_validate( glyph, valid ) )
GXV_TRACE(( " endmarker found within defined range"
" (entry %d < nUnits=%d)\n",
unit, nUnits ));
if ( prev_glyph > glyph )
{
GXV_TRACE(( "current gid 0x%04x < previous gid 0x%04x\n",
glyph, prev_glyph ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
}
prev_glyph = glyph;
valid->lookupval_func( glyph, value, valid );
}
gxv_LookupTable_fmt6_skip_endmarkers( p, unitSize, valid );
p += valid->subtable_length;
valid->subtable_length = p - table;
GXV_EXIT;
}
/* ================= Trimmed Array Format 8 Lookup Table =============== */
static void
gxv_LookupTable_fmt8_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort i;
GXV_LookupValueDesc value;
FT_UShort firstGlyph;
FT_UShort glyphCount;
GXV_NAME_ENTER( "LookupTable format 8" );
/* firstGlyph + glyphCount */
GXV_LIMIT_CHECK( 2 + 2 );
firstGlyph = FT_NEXT_USHORT( p );
glyphCount = FT_NEXT_USHORT( p );
gxv_glyphid_validate( firstGlyph, valid );
gxv_glyphid_validate( (FT_UShort)( firstGlyph + glyphCount ), valid );
/* valueArray */
for ( i = 0; i < glyphCount; i++ )
{
GXV_LIMIT_CHECK( 2 );
value = GXV_LOOKUP_VALUE_LOAD( p, valid->lookupval_sign );
valid->lookupval_func( (FT_UShort)( firstGlyph + i ), value, valid );
}
valid->subtable_length = p - table;
GXV_EXIT;
}
FT_LOCAL_DEF( void )
gxv_LookupTable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort format;
GXV_Validate_Func fmt_funcs_table[] =
{
gxv_LookupTable_fmt0_validate, /* 0 */
NULL, /* 1 */
gxv_LookupTable_fmt2_validate, /* 2 */
NULL, /* 3 */
gxv_LookupTable_fmt4_validate, /* 4 */
NULL, /* 5 */
gxv_LookupTable_fmt6_validate, /* 6 */
NULL, /* 7 */
gxv_LookupTable_fmt8_validate, /* 8 */
};
GXV_Validate_Func func;
GXV_NAME_ENTER( "LookupTable" );
/* lookuptbl_head may be used in fmt4 transit function. */
valid->lookuptbl_head = table;
/* format */
GXV_LIMIT_CHECK( 2 );
format = FT_NEXT_USHORT( p );
GXV_TRACE(( " (format %d)\n", format ));
if ( format > 8 )
FT_INVALID_FORMAT;
func = fmt_funcs_table[format];
if ( func == NULL )
FT_INVALID_FORMAT;
func( p, limit, valid );
p += valid->subtable_length;
valid->subtable_length = p - table;
GXV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** Glyph ID *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( FT_Int )
gxv_glyphid_validate( FT_UShort gid,
GXV_Validator valid )
{
FT_Face face;
if ( gid == 0xFFFFU )
{
GXV_EXIT;
return 1;
}
face = valid->face;
if ( face->num_glyphs < gid )
{
GXV_TRACE(( " gxv_glyphid_check() gid overflow: num_glyphs %d < %d\n",
face->num_glyphs, gid ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
}
return 0;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CONTROL POINT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
gxv_ctlPoint_validate( FT_UShort gid,
FT_Short ctl_point,
GXV_Validator valid )
{
FT_Face face;
FT_Error error;
FT_GlyphSlot glyph;
FT_Outline outline;
short n_points;
face = valid->face;
error = FT_Load_Glyph( face,
gid,
FT_LOAD_NO_BITMAP | FT_LOAD_IGNORE_TRANSFORM );
if ( error )
FT_INVALID_GLYPH_ID;
glyph = face->glyph;
outline = glyph->outline;
n_points = outline.n_points;
if ( !( ctl_point < n_points ) )
FT_INVALID_DATA;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SFNT NAME *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
gxv_sfntName_validate( FT_UShort name_index,
FT_UShort min_index,
FT_UShort max_index,
GXV_Validator valid )
{
FT_SfntName name;
FT_UInt i;
FT_UInt nnames;
GXV_NAME_ENTER( "sfntName" );
if ( name_index < min_index || max_index < name_index )
FT_INVALID_FORMAT;
nnames = FT_Get_Sfnt_Name_Count( valid->face );
for ( i = 0; i < nnames; i++ )
{
if ( FT_Get_Sfnt_Name( valid->face, i, &name ) != FT_Err_Ok )
continue ;
if ( name.name_id == name_index )
goto Out;
}
GXV_TRACE(( " nameIndex = %d (UNTITLED)\n", name_index ));
FT_INVALID_DATA;
goto Exit; /* make compiler happy */
Out:
FT_TRACE1(( " nameIndex = %d (", name_index ));
GXV_TRACE_HEXDUMP_SFNTNAME( name );
FT_TRACE1(( ")\n" ));
Exit:
GXV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** STATE TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* -------------------------- Class Table --------------------------- */
/*
* highestClass specifies how many classes are defined in this
* Class Subtable. Apple spec does not mention whether undefined
* holes in the class (e.g.: 0-3 are predefined, 4 is unused, 5 is used)
* are permitted. At present, holes in a defined class are not checked.
* -- suzuki toshiya <[email protected]>
*/
static void
gxv_ClassTable_validate( FT_Bytes table,
FT_UShort* length_p,
FT_UShort stateSize,
FT_Byte* maxClassID_p,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_Bytes limit = table + *length_p;
FT_UShort firstGlyph;
FT_UShort nGlyphs;
GXV_NAME_ENTER( "ClassTable" );
*maxClassID_p = 3; /* Classes 0, 2, and 3 are predefined */
GXV_LIMIT_CHECK( 2 + 2 );
firstGlyph = FT_NEXT_USHORT( p );
nGlyphs = FT_NEXT_USHORT( p );
GXV_TRACE(( " (firstGlyph = %d, nGlyphs = %d)\n", firstGlyph, nGlyphs ));
if ( !nGlyphs )
goto Out;
gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs ), valid );
{
FT_Byte nGlyphInClass[256];
FT_Byte classID;
FT_UShort i;
ft_memset( nGlyphInClass, 0, 256 );
for ( i = 0; i < nGlyphs; i++ )
{
GXV_LIMIT_CHECK( 1 );
classID = FT_NEXT_BYTE( p );
switch ( classID )
{
/* following classes should not appear in class array */
case 0: /* end of text */
case 2: /* out of bounds */
case 3: /* end of line */
FT_INVALID_DATA;
break;
case 1: /* out of bounds */
default: /* user-defined: 4 - ( stateSize - 1 ) */
if ( classID >= stateSize )
FT_INVALID_DATA; /* assign glyph to undefined state */
nGlyphInClass[classID]++;
break;
}
}
*length_p = (FT_UShort)( p - table );
/* scan max ClassID in use */
for ( i = 0; i < stateSize; i++ )
if ( ( 3 < i ) && ( nGlyphInClass[i] > 0 ) )
*maxClassID_p = (FT_Byte)i; /* XXX: Check Range? */
}
Out:
GXV_TRACE(( "Declared stateSize=0x%02x, Used maxClassID=0x%02x\n",
stateSize, *maxClassID_p ));
GXV_EXIT;
}
/* --------------------------- State Array ----------------------------- */
static void
gxv_StateArray_validate( FT_Bytes table,
FT_UShort* length_p,
FT_Byte maxClassID,
FT_UShort stateSize,
FT_Byte* maxState_p,
FT_Byte* maxEntry_p,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_Bytes limit = table + *length_p;
FT_Byte clazz;
FT_Byte entry;
FT_UNUSED( stateSize ); /* for the non-debugging case */
GXV_NAME_ENTER( "StateArray" );
GXV_TRACE(( "parse %d bytes by stateSize=%d maxClassID=%d\n",
(int)(*length_p), stateSize, (int)(maxClassID) ));
/*
* 2 states are predefined and must be described in StateArray:
* state 0 (start of text), 1 (start of line)
*/
GXV_LIMIT_CHECK( ( 1 + maxClassID ) * 2 );
*maxState_p = 0;
*maxEntry_p = 0;
/* read if enough to read another state */
while ( p + ( 1 + maxClassID ) <= limit )
{
(*maxState_p)++;
for ( clazz = 0; clazz <= maxClassID; clazz++ )
{
entry = FT_NEXT_BYTE( p );
*maxEntry_p = (FT_Byte)FT_MAX( *maxEntry_p, entry );
}
}
GXV_TRACE(( "parsed: maxState=%d, maxEntry=%d\n",
*maxState_p, *maxEntry_p ));
*length_p = (FT_UShort)( p - table );
GXV_EXIT;
}
/* --------------------------- Entry Table ----------------------------- */
static void
gxv_EntryTable_validate( FT_Bytes table,
FT_UShort* length_p,
FT_Byte maxEntry,
FT_UShort stateArray,
FT_UShort stateArray_length,
FT_Byte maxClassID,
FT_Bytes statetable_table,
FT_Bytes statetable_limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_Bytes limit = table + *length_p;
FT_Byte entry;
FT_Byte state;
FT_Int entrySize = 2 + 2 + GXV_GLYPHOFFSET_SIZE( statetable );
GXV_XStateTable_GlyphOffsetDesc glyphOffset;
GXV_NAME_ENTER( "EntryTable" );
GXV_TRACE(( "maxEntry=%d entrySize=%d\n", maxEntry, entrySize ));
if ( ( maxEntry + 1 ) * entrySize > *length_p )
{
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_TOO_SHORT;
/* ftxvalidator and FontValidator both warn and continue */
maxEntry = (FT_Byte)( *length_p / entrySize - 1 );
GXV_TRACE(( "too large maxEntry, shrinking to %d fit EntryTable length\n",
maxEntry ));
}
for ( entry = 0; entry <= maxEntry; entry++ )
{
FT_UShort newState;
FT_UShort flags;
GXV_LIMIT_CHECK( 2 + 2 );
newState = FT_NEXT_USHORT( p );
flags = FT_NEXT_USHORT( p );
if ( newState < stateArray ||
stateArray + stateArray_length < newState )
{
GXV_TRACE(( " newState offset 0x%04x is out of stateArray\n",
newState ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_OFFSET;
continue;
}
if ( 0 != ( ( newState - stateArray ) % ( 1 + maxClassID ) ) )
{
GXV_TRACE(( " newState offset 0x%04x is not aligned to %d-classes\n",
newState, 1 + maxClassID ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_OFFSET;
continue;
}
state = (FT_Byte)( ( newState - stateArray ) / ( 1 + maxClassID ) );
switch ( GXV_GLYPHOFFSET_FMT( statetable ) )
{
case GXV_GLYPHOFFSET_NONE:
glyphOffset.uc = 0; /* make compiler happy */
break;
case GXV_GLYPHOFFSET_UCHAR:
glyphOffset.uc = FT_NEXT_BYTE( p );
break;
case GXV_GLYPHOFFSET_CHAR:
glyphOffset.c = FT_NEXT_CHAR( p );
break;
case GXV_GLYPHOFFSET_USHORT:
glyphOffset.u = FT_NEXT_USHORT( p );
break;
case GXV_GLYPHOFFSET_SHORT:
glyphOffset.s = FT_NEXT_SHORT( p );
break;
case GXV_GLYPHOFFSET_ULONG:
glyphOffset.ul = FT_NEXT_ULONG( p );
break;
case GXV_GLYPHOFFSET_LONG:
glyphOffset.l = FT_NEXT_LONG( p );
break;
default:
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_FORMAT;
goto Exit;
}
if ( NULL != valid->statetable.entry_validate_func )
valid->statetable.entry_validate_func( state,
flags,
glyphOffset,
statetable_table,
statetable_limit,
valid );
}
Exit:
*length_p = (FT_UShort)( p - table );
GXV_EXIT;
}
/* =========================== State Table ============================= */
FT_LOCAL_DEF( void )
gxv_StateTable_subtable_setup( FT_UShort table_size,
FT_UShort classTable,
FT_UShort stateArray,
FT_UShort entryTable,
FT_UShort* classTable_length_p,
FT_UShort* stateArray_length_p,
FT_UShort* entryTable_length_p,
GXV_Validator valid )
{
FT_UShort o[3];
FT_UShort* l[3];
FT_UShort buff[4];
o[0] = classTable;
o[1] = stateArray;
o[2] = entryTable;
l[0] = classTable_length_p;
l[1] = stateArray_length_p;
l[2] = entryTable_length_p;
gxv_set_length_by_ushort_offset( o, l, buff, 3, table_size, valid );
}
FT_LOCAL_DEF( void )
gxv_StateTable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_UShort stateSize;
FT_UShort classTable; /* offset to Class(Sub)Table */
FT_UShort stateArray; /* offset to StateArray */
FT_UShort entryTable; /* offset to EntryTable */
FT_UShort classTable_length;
FT_UShort stateArray_length;
FT_UShort entryTable_length;
FT_Byte maxClassID;
FT_Byte maxState;
FT_Byte maxEntry;
GXV_StateTable_Subtable_Setup_Func setup_func;
FT_Bytes p = table;
GXV_NAME_ENTER( "StateTable" );
GXV_TRACE(( "StateTable header\n" ));
GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 );
stateSize = FT_NEXT_USHORT( p );
classTable = FT_NEXT_USHORT( p );
stateArray = FT_NEXT_USHORT( p );
entryTable = FT_NEXT_USHORT( p );
GXV_TRACE(( "stateSize=0x%04x\n", stateSize ));
GXV_TRACE(( "offset to classTable=0x%04x\n", classTable ));
GXV_TRACE(( "offset to stateArray=0x%04x\n", stateArray ));
GXV_TRACE(( "offset to entryTable=0x%04x\n", entryTable ));
if ( stateSize > 0xFF )
FT_INVALID_DATA;
if ( valid->statetable.optdata_load_func != NULL )
valid->statetable.optdata_load_func( p, limit, valid );
if ( valid->statetable.subtable_setup_func != NULL)
setup_func = valid->statetable.subtable_setup_func;
else
setup_func = gxv_StateTable_subtable_setup;
setup_func( (FT_UShort)( limit - table ),
classTable,
stateArray,
entryTable,
&classTable_length,
&stateArray_length,
&entryTable_length,
valid );
GXV_TRACE(( "StateTable Subtables\n" ));
if ( classTable != 0 )
gxv_ClassTable_validate( table + classTable,
&classTable_length,
stateSize,
&maxClassID,
valid );
else
maxClassID = (FT_Byte)( stateSize - 1 );
if ( stateArray != 0 )
gxv_StateArray_validate( table + stateArray,
&stateArray_length,
maxClassID,
stateSize,
&maxState,
&maxEntry,
valid );
else
{
maxState = 1; /* 0:start of text, 1:start of line are predefined */
maxEntry = 0;
}
if ( maxEntry > 0 && entryTable == 0 )
FT_INVALID_OFFSET;
if ( entryTable != 0 )
gxv_EntryTable_validate( table + entryTable,
&entryTable_length,
maxEntry,
stateArray,
stateArray_length,
maxClassID,
table,
limit,
valid );
GXV_EXIT;
}
/* ================= eXtended State Table (for morx) =================== */
FT_LOCAL_DEF( void )
gxv_XStateTable_subtable_setup( FT_ULong table_size,
FT_ULong classTable,
FT_ULong stateArray,
FT_ULong entryTable,
FT_ULong* classTable_length_p,
FT_ULong* stateArray_length_p,
FT_ULong* entryTable_length_p,
GXV_Validator valid )
{
FT_ULong o[3];
FT_ULong* l[3];
FT_ULong buff[4];
o[0] = classTable;
o[1] = stateArray;
o[2] = entryTable;
l[0] = classTable_length_p;
l[1] = stateArray_length_p;
l[2] = entryTable_length_p;
gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid );
}
static void
gxv_XClassTable_lookupval_validate( FT_UShort glyph,
GXV_LookupValueDesc value,
GXV_Validator valid )
{
FT_UNUSED( glyph );
if ( value.u >= valid->xstatetable.nClasses )
FT_INVALID_DATA;
if ( value.u > valid->xstatetable.maxClassID )
valid->xstatetable.maxClassID = value.u;
}
/*
+===============+ --------+
| lookup header | |
+===============+ |
| BinSrchHeader | |
+===============+ |
| lastGlyph[0] | |
+---------------+ |
| firstGlyph[0] | | head of lookup table
+---------------+ | +
| offset[0] | -> | offset [byte]
+===============+ | +
| lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
+---------------+ |
| firstGlyph[1] | |
+---------------+ |
| offset[1] | |
+===============+ |
|
.... |
|
16bit value array |
+===============+ |
| value | <-------+
....
*/
static GXV_LookupValueDesc
gxv_XClassTable_lookupfmt4_transit( FT_UShort relative_gindex,
GXV_LookupValueDesc base_value,
FT_Bytes lookuptbl_limit,
GXV_Validator valid )
{
FT_Bytes p;
FT_Bytes limit;
FT_UShort offset;
GXV_LookupValueDesc value;
/* XXX: check range? */
offset = (FT_UShort)( base_value.u +
relative_gindex * sizeof ( FT_UShort ) );
p = valid->lookuptbl_head + offset;
limit = lookuptbl_limit;
GXV_LIMIT_CHECK ( 2 );
value.u = FT_NEXT_USHORT( p );
return value;
}
static void
gxv_XStateArray_validate( FT_Bytes table,
FT_ULong* length_p,
FT_UShort maxClassID,
FT_ULong stateSize,
FT_UShort* maxState_p,
FT_UShort* maxEntry_p,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_Bytes limit = table + *length_p;
FT_UShort clazz;
FT_UShort entry;
FT_UNUSED( stateSize ); /* for the non-debugging case */
GXV_NAME_ENTER( "XStateArray" );
GXV_TRACE(( "parse % 3d bytes by stateSize=% 3d maxClassID=% 3d\n",
(int)(*length_p), stateSize, (int)(maxClassID) ));
/*
* 2 states are predefined and must be described:
* state 0 (start of text), 1 (start of line)
*/
GXV_LIMIT_CHECK( ( 1 + maxClassID ) * 2 * 2 );
*maxState_p = 0;
*maxEntry_p = 0;
/* read if enough to read another state */
while ( p + ( ( 1 + maxClassID ) * 2 ) <= limit )
{
(*maxState_p)++;
for ( clazz = 0; clazz <= maxClassID; clazz++ )
{
entry = FT_NEXT_USHORT( p );
*maxEntry_p = (FT_UShort)FT_MAX( *maxEntry_p, entry );
}
}
GXV_TRACE(( "parsed: maxState=%d, maxEntry=%d\n",
*maxState_p, *maxEntry_p ));
*length_p = p - table;
GXV_EXIT;
}
static void
gxv_XEntryTable_validate( FT_Bytes table,
FT_ULong* length_p,
FT_UShort maxEntry,
FT_ULong stateArray_length,
FT_UShort maxClassID,
FT_Bytes xstatetable_table,
FT_Bytes xstatetable_limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_Bytes limit = table + *length_p;
FT_UShort entry;
FT_UShort state;
FT_Int entrySize = 2 + 2 + GXV_GLYPHOFFSET_SIZE( xstatetable );
GXV_NAME_ENTER( "XEntryTable" );
GXV_TRACE(( "maxEntry=%d entrySize=%d\n", maxEntry, entrySize ));
if ( ( p + ( maxEntry + 1 ) * entrySize ) > limit )
FT_INVALID_TOO_SHORT;
for (entry = 0; entry <= maxEntry ; entry++ )
{
FT_UShort newState_idx;
FT_UShort flags;
GXV_XStateTable_GlyphOffsetDesc glyphOffset;
GXV_LIMIT_CHECK( 2 + 2 );
newState_idx = FT_NEXT_USHORT( p );
flags = FT_NEXT_USHORT( p );
if ( stateArray_length < (FT_ULong)( newState_idx * 2 ) )
{
GXV_TRACE(( " newState index 0x%04x points out of stateArray\n",
newState_idx ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_OFFSET;
}
state = (FT_UShort)( newState_idx / ( 1 + maxClassID ) );
if ( 0 != ( newState_idx % ( 1 + maxClassID ) ) )
{
FT_TRACE4(( "-> new state = %d (supposed)\n"
"but newState index 0x%04x is not aligned to %d-classes\n",
state, newState_idx, 1 + maxClassID ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_OFFSET;
}
switch ( GXV_GLYPHOFFSET_FMT( xstatetable ) )
{
case GXV_GLYPHOFFSET_NONE:
glyphOffset.uc = 0; /* make compiler happy */
break;
case GXV_GLYPHOFFSET_UCHAR:
glyphOffset.uc = FT_NEXT_BYTE( p );
break;
case GXV_GLYPHOFFSET_CHAR:
glyphOffset.c = FT_NEXT_CHAR( p );
break;
case GXV_GLYPHOFFSET_USHORT:
glyphOffset.u = FT_NEXT_USHORT( p );
break;
case GXV_GLYPHOFFSET_SHORT:
glyphOffset.s = FT_NEXT_SHORT( p );
break;
case GXV_GLYPHOFFSET_ULONG:
glyphOffset.ul = FT_NEXT_ULONG( p );
break;
case GXV_GLYPHOFFSET_LONG:
glyphOffset.l = FT_NEXT_LONG( p );
break;
default:
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_FORMAT;
goto Exit;
}
if ( NULL != valid->xstatetable.entry_validate_func )
valid->xstatetable.entry_validate_func( state,
flags,
glyphOffset,
xstatetable_table,
xstatetable_limit,
valid );
}
Exit:
*length_p = p - table;
GXV_EXIT;
}
FT_LOCAL_DEF( void )
gxv_XStateTable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
/* StateHeader members */
FT_ULong classTable; /* offset to Class(Sub)Table */
FT_ULong stateArray; /* offset to StateArray */
FT_ULong entryTable; /* offset to EntryTable */
FT_ULong classTable_length;
FT_ULong stateArray_length;
FT_ULong entryTable_length;
FT_UShort maxState;
FT_UShort maxEntry;
GXV_XStateTable_Subtable_Setup_Func setup_func;
FT_Bytes p = table;
GXV_NAME_ENTER( "XStateTable" );
GXV_TRACE(( "XStateTable header\n" ));
GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );
valid->xstatetable.nClasses = FT_NEXT_ULONG( p );
classTable = FT_NEXT_ULONG( p );
stateArray = FT_NEXT_ULONG( p );
entryTable = FT_NEXT_ULONG( p );
GXV_TRACE(( "nClasses =0x%08x\n", valid->xstatetable.nClasses ));
GXV_TRACE(( "offset to classTable=0x%08x\n", classTable ));
GXV_TRACE(( "offset to stateArray=0x%08x\n", stateArray ));
GXV_TRACE(( "offset to entryTable=0x%08x\n", entryTable ));
if ( valid->xstatetable.nClasses > 0xFFFFU )
FT_INVALID_DATA;
GXV_TRACE(( "StateTable Subtables\n" ));
if ( valid->xstatetable.optdata_load_func != NULL )
valid->xstatetable.optdata_load_func( p, limit, valid );
if ( valid->xstatetable.subtable_setup_func != NULL )
setup_func = valid->xstatetable.subtable_setup_func;
else
setup_func = gxv_XStateTable_subtable_setup;
setup_func( limit - table,
classTable,
stateArray,
entryTable,
&classTable_length,
&stateArray_length,
&entryTable_length,
valid );
if ( classTable != 0 )
{
valid->xstatetable.maxClassID = 0;
valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
valid->lookupval_func = gxv_XClassTable_lookupval_validate;
valid->lookupfmt4_trans = gxv_XClassTable_lookupfmt4_transit;
gxv_LookupTable_validate( table + classTable,
table + classTable + classTable_length,
valid );
if ( valid->subtable_length < classTable_length )
classTable_length = valid->subtable_length;
}
else
{
/* XXX: check range? */
valid->xstatetable.maxClassID =
(FT_UShort)( valid->xstatetable.nClasses - 1 );
}
if ( stateArray != 0 )
gxv_XStateArray_validate( table + stateArray,
&stateArray_length,
valid->xstatetable.maxClassID,
valid->xstatetable.nClasses,
&maxState,
&maxEntry,
valid );
else
{
maxState = 1; /* 0:start of text, 1:start of line are predefined */
maxEntry = 0;
}
if ( maxEntry > 0 && entryTable == 0 )
FT_INVALID_OFFSET;
if ( entryTable != 0 )
gxv_XEntryTable_validate( table + entryTable,
&entryTable_length,
maxEntry,
stateArray_length,
valid->xstatetable.maxClassID,
table,
limit,
valid );
GXV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** Table overlapping *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static int
gxv_compare_ranges( FT_Bytes table1_start,
FT_ULong table1_length,
FT_Bytes table2_start,
FT_ULong table2_length )
{
if ( table1_start == table2_start )
{
if ( ( table1_length == 0 || table2_length == 0 ) )
goto Out;
}
else if ( table1_start < table2_start )
{
if ( ( table1_start + table1_length ) <= table2_start )
goto Out;
}
else if ( table1_start > table2_start )
{
if ( ( table1_start >= table2_start + table2_length ) )
goto Out;
}
return 1;
Out:
return 0;
}
FT_LOCAL_DEF( void )
gxv_odtect_add_range( FT_Bytes start,
FT_ULong length,
const FT_String* name,
GXV_odtect_Range odtect )
{
odtect->range[ odtect->nRanges ].start = start;
odtect->range[ odtect->nRanges ].length = length;
odtect->range[ odtect->nRanges ].name = (FT_String*)name;
odtect->nRanges++;
}
FT_LOCAL_DEF( void )
gxv_odtect_validate( GXV_odtect_Range odtect,
GXV_Validator valid )
{
FT_UInt i, j;
GXV_NAME_ENTER( "check overlap among multi ranges" );
for ( i = 0; i < odtect->nRanges; i++ )
for ( j = 0; j < i; j++ )
if ( 0 != gxv_compare_ranges( odtect->range[i].start,
odtect->range[i].length,
odtect->range[j].start,
odtect->range[j].length ) )
{
if ( odtect->range[i].name || odtect->range[j].name )
GXV_TRACE(( "found overlap between range %d and range %d\n",
i, j ));
else
GXV_TRACE(( "found overlap between `%s' and `%s\'\n",
odtect->range[i].name,
odtect->range[j].name ));
FT_INVALID_OFFSET;
}
GXV_EXIT;
}
/* END */