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//========================================================================
//Copyright 2011-2012 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//All rights reserved. This program and the accompanying materials
//are made available under the terms of the Eclipse Public License v1.0
//and Apache License v2.0 which accompanies this distribution.
//The Eclipse Public License is available at
//http://www.eclipse.org/legal/epl-v10.html
//The Apache License v2.0 is available at
//http://www.opensource.org/licenses/apache2.0.php
//You may elect to redistribute this code under either of these licenses.
//========================================================================
package org.eclipse.jetty.spdy.generator;
import java.nio.ByteBuffer;
import org.eclipse.jetty.spdy.ByteBufferPool;
import org.eclipse.jetty.spdy.api.SPDY;
import org.eclipse.jetty.spdy.api.Settings;
import org.eclipse.jetty.spdy.frames.ControlFrame;
import org.eclipse.jetty.spdy.frames.SettingsFrame;
public class SettingsGenerator extends ControlFrameGenerator
{
public SettingsGenerator(ByteBufferPool bufferPool)
{
super(bufferPool);
}
@Override
public ByteBuffer generate(ControlFrame frame)
{
SettingsFrame settingsFrame = (SettingsFrame)frame;
Settings settings = settingsFrame.getSettings();
int size = settings.size();
int frameBodyLength = 4 + 8 * size;
int totalLength = ControlFrame.HEADER_LENGTH + frameBodyLength;
ByteBuffer buffer = getByteBufferPool().acquire(totalLength, true);
generateControlFrameHeader(settingsFrame, frameBodyLength, buffer);
buffer.putInt(size);
for (Settings.Setting setting : settings)
{
int id = setting.id().code();
byte flags = setting.flag().code();
int idAndFlags = convertIdAndFlags(frame.getVersion(), id, flags);
buffer.putInt(idAndFlags);
buffer.putInt(setting.value());
}
buffer.flip();
return buffer;
}
private int convertIdAndFlags(short version, int id, byte flags)
{
switch (version)
{
case SPDY.V2:
{
// In v2 the format is 24 bits of ID + 8 bits of flag
int idAndFlags = (id << 8) + (flags & 0xFF);
// A bug in the Chromium implementation forces v2 to have
// the 3 ID bytes little endian, so we swap first and third
int result = idAndFlags & 0x00_FF_00_FF;
result += (idAndFlags & 0xFF_00_00_00) >>> 16;
result += (idAndFlags & 0x00_00_FF_00) << 16;
return result;
}
case SPDY.V3:
{
// In v3 the format is 8 bits of flags + 24 bits of ID
return (flags << 24) + (id & 0xFF_FF_FF);
}
default:
{
throw new IllegalStateException();
}
}
}
}
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