[etc]

    public function readASInt():int {
        var result:uint = 0;
        var i:uint = 0, byte:uint;
        do {
            byte = super.readUnsignedByte();
            result |= ( byte & 0x7F ) << ( i*7 );
            i+=1;
        } while ( byte & 1<<7 );
        return result;            
    }