static void
otv_O_x_Ox( FT_Bytes table,
OTV_Validator valid )
{
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, valid, GlyphCount );
if ( GlyphCount != otv_Coverage_get_count( Coverage ) )
FT_INVALID_DATA;
OTV_LIMIT_CHECK( GlyphCount * 2 );
valid->nesting_level++;
func = valid->func[valid->nesting_level];
valid->extra1 = 0;
for ( ; GlyphCount > 0; GlyphCount-- )
func( table + FT_NEXT_USHORT( p ), valid );
valid->nesting_level--;
OTV_EXIT;
}
static void
otv_ReverseChainSingleSubst_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table, Coverage;
FT_UInt SubstFormat;
FT_UInt BacktrackGlyphCount, LookaheadGlyphCount, GlyphCount;
OTV_NAME_ENTER( "ReverseChainSingleSubst" );
OTV_LIMIT_CHECK( 2 );
SubstFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", SubstFormat ));
switch ( SubstFormat )
{
case 1: /* ReverseChainSingleSubstFormat1 */
OTV_LIMIT_CHECK( 4 );
Coverage = table + FT_NEXT_USHORT( p );
BacktrackGlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (BacktrackGlyphCount = %d)\n", BacktrackGlyphCount ));
otv_Coverage_validate( Coverage, otvalid, -1 );
OTV_LIMIT_CHECK( BacktrackGlyphCount * 2 + 2 );
for ( ; BacktrackGlyphCount > 0; BacktrackGlyphCount-- )
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 );
LookaheadGlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (LookaheadGlyphCount = %d)\n", LookaheadGlyphCount ));
OTV_LIMIT_CHECK( LookaheadGlyphCount * 2 + 2 );
for ( ; LookaheadGlyphCount > 0; LookaheadGlyphCount-- )
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 );
GlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
if ( GlyphCount != otv_Coverage_get_count( Coverage ) )
FT_INVALID_DATA;
OTV_LIMIT_CHECK( GlyphCount * 2 );
/* Substitute */
for ( ; GlyphCount > 0; GlyphCount-- )
if ( FT_NEXT_USHORT( p ) >= otvalid->glyph_count )
FT_INVALID_DATA;
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
