// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package rdpclient.rdp;
import java.awt.image.IndexColorModel;
import streamer.BaseElement;
import streamer.ByteBuffer;
import streamer.Link;
import common.ScreenDescription;
/**
* @see http://msdn.microsoft.com/en-us/library/cc240623.aspx
*/
public class ServerPaletteUpdate extends BaseElement {
public static final int UPDATETYPE_PALETTE = 0x0002;
protected ScreenDescription screen;
public ServerPaletteUpdate(String id, ScreenDescription screen) {
super(id);
this.screen = screen;
}
@Override
public void handleData(ByteBuffer buf, Link link) {
if (verbose)
System.out.println("[" + this + "] INFO: Data received: " + buf + ".");
// (2 bytes): A 16-bit, unsigned integer. The update type. This field MUST
// be set to UPDATETYPE_PALETTE (0x0002).
int updateType = buf.readUnsignedShortLE();
if (updateType != UPDATETYPE_PALETTE)
throw new RuntimeException("Unexpected update type. Expected type: UPDATETYPE_PALETTE (0x0002), actual value: " + updateType + ", data: " + buf + ".");
// pad2Octets (2 bytes): A 16-bit, unsigned integer. Padding. Values in this
// field MUST be ignored.
buf.skipBytes(2);
// (4 bytes): A 32-bit, unsigned integer. The number of RGB triplets in the
// paletteData field. This field MUST be set to 256 (the number of entries
// in an 8 bpp palette).
int numberColors = (int)buf.readUnsignedIntLE();
if (numberColors != 256)
throw new RuntimeException("Unexpected value for number of color field in server Palette Update packet. Expected value: 256 colors, actual value: "
+ numberColors + ", data: " + buf + ".");
// (variable): An array of palette entries in RGB triplet format packed on
// byte boundaries. The number of triplet entries is given by the
// numberColors field.
ByteBuffer paletteEntries = buf.readBytes(numberColors * 3);
// In the case of a Palette Update, the client MUST update the global
// palette on all drawing surfaces
screen.colorMap = new IndexColorModel(8, numberColors, paletteEntries.data, paletteEntries.offset, false);
/* DEBUG */buf.assertThatBufferIsFullyRead();
buf.unref();
}
}