internal override int Decode( string str, int startPos, int len ) {
Debug.Assert( str != null );
Debug.Assert( len >= 0 );
Debug.Assert( startPos >= 0 );
Debug.Assert( str.Length - startPos >= len );
Debug.Assert( len > 0 );
int copyCount = endIndex - curIndex;
if ( copyCount > len ) {
copyCount = len;
}
str.CopyTo( startPos, buffer, curIndex, copyCount );
curIndex += copyCount;
return copyCount;
}