org.eclipse.jetty.spdy.generator.HeadersGenerator Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2013 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.io.ByteBufferPool;
import org.eclipse.jetty.spdy.SessionException;
import org.eclipse.jetty.spdy.api.SPDY;
import org.eclipse.jetty.spdy.api.SessionStatus;
import org.eclipse.jetty.spdy.frames.ControlFrame;
import org.eclipse.jetty.spdy.frames.HeadersFrame;
import org.eclipse.jetty.util.BufferUtil;
public class HeadersGenerator extends ControlFrameGenerator
{
private final HeadersBlockGenerator headersBlockGenerator;
public HeadersGenerator(ByteBufferPool bufferPool, HeadersBlockGenerator headersBlockGenerator)
{
super(bufferPool);
this.headersBlockGenerator = headersBlockGenerator;
}
@Override
public ByteBuffer generate(ControlFrame frame)
{
HeadersFrame headers = (HeadersFrame)frame;
short version = headers.getVersion();
ByteBuffer headersBuffer = headersBlockGenerator.generate(version, headers.getHeaders());
int frameBodyLength = 4;
if (frame.getVersion() == SPDY.V2)
frameBodyLength += 2;
int frameLength = frameBodyLength + headersBuffer.remaining();
if (frameLength > 0xFF_FF_FF)
{
// Too many headers, but unfortunately we have already modified the compression
// context, so we have no other choice than tear down the connection.
throw new SessionException(SessionStatus.PROTOCOL_ERROR, "Too many headers");
}
int totalLength = ControlFrame.HEADER_LENGTH + frameLength;
ByteBuffer buffer = getByteBufferPool().acquire(totalLength, Generator.useDirectBuffers);
BufferUtil.clearToFill(buffer);
generateControlFrameHeader(headers, frameLength, buffer);
buffer.putInt(headers.getStreamId() & 0x7F_FF_FF_FF);
if (frame.getVersion() == SPDY.V2)
buffer.putShort((short)0);
buffer.put(headersBuffer);
buffer.flip();
return buffer;
}
}