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            // Otherwise, mimetype must be unsupported
            else
                guac_client.sendAck(stream_index, "BAD TYPE", 0x030F);

        }

    };

    tunnel.oninstruction = function(opcode, parameters) {

        var handler = instructionHandlers[opcode];
        if (handler)
            handler(parameters);

    };

    /**
     * Sends a disconnect instruction to the server and closes the tunnel.
     */
    this.disconnect = function() {

        // Only attempt disconnection not disconnected.
        if (currentState != STATE_DISCONNECTED
                && currentState != STATE_DISCONNECTING) {

            setState(STATE_DISCONNECTING);

            // Stop ping
            if (pingInterval)
                window.clearInterval(pingInterval);

            // Send disconnect message and disconnect
            tunnel.sendMessage("disconnect");
            tunnel.disconnect();
            setState(STATE_DISCONNECTED);

        }

    };
    
    /**
     * Connects the underlying tunnel of this Guacamole.Client, passing the
     * given arbitrary data to the tunnel during the connection process.
     *
     * @param data Arbitrary connection data to be sent to the underlying
     *             tunnel during the connection process.
     * @throws {Guacamole.Status} If an error occurs during connection.
     */
    this.connect = function(data) {

        setState(STATE_CONNECTING);

        try {
            tunnel.connect(data);
        }
        catch (status) {
            setState(STATE_IDLE);
            throw status;
        }

        // Ping every 5 seconds (ensure connection alive)
        pingInterval = window.setInterval(function() {
            tunnel.sendMessage("nop");
        }, 5000);

        setState(STATE_WAITING);
    };

};

/**
 * Map of all Guacamole binary raster operations to transfer functions.
 * @private
 */
Guacamole.Client.DefaultTransferFunction = {

    /* BLACK */
    0x0: function (src, dst) {
        dst.red = dst.green = dst.blue = 0x00;
    },

    /* WHITE */
    0xF: function (src, dst) {
        dst.red = dst.green = dst.blue = 0xFF;
    },

    /* SRC */
    0x3: function (src, dst) {
        dst.red   = src.red;
        dst.green = src.green;
        dst.blue  = src.blue;
        dst.alpha = src.alpha;
    },

    /* DEST (no-op) */
    0x5: function (src, dst) {
        // Do nothing
    },

    /* Invert SRC */
    0xC: function (src, dst) {
        dst.red   = 0xFF & ~src.red;
        dst.green = 0xFF & ~src.green;
        dst.blue  = 0xFF & ~src.blue;
        dst.alpha =  src.alpha;
    },
    
    /* Invert DEST */
    0xA: function (src, dst) {
        dst.red   = 0xFF & ~dst.red;
        dst.green = 0xFF & ~dst.green;
        dst.blue  = 0xFF & ~dst.blue;
    },

    /* AND */
    0x1: function (src, dst) {
        dst.red   =  ( src.red   &  dst.red);
        dst.green =  ( src.green &  dst.green);
        dst.blue  =  ( src.blue  &  dst.blue);
    },