//
// ========================================================================
// Copyright (c) 1995-2014 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.http2.parser;
import java.nio.ByteBuffer;
import org.eclipse.jetty.http.MetaData;
import org.eclipse.jetty.http2.hpack.HpackDecoder;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.util.BufferUtil;
public class HeaderBlockParser
{
private final ByteBufferPool byteBufferPool;
private final HpackDecoder hpackDecoder;
private ByteBuffer blockBuffer;
public HeaderBlockParser(ByteBufferPool byteBufferPool, HpackDecoder hpackDecoder)
{
this.byteBufferPool = byteBufferPool;
this.hpackDecoder = hpackDecoder;
}
public MetaData parse(ByteBuffer buffer, int blockLength)
{
// We must wait for the all the bytes of the header block to arrive.
// If they are not all available, accumulate them.
// When all are available, decode them.
int accumulated = blockBuffer == null ? 0 : blockBuffer.position();
int remaining = blockLength - accumulated;
if (buffer.remaining() < remaining)
{
if (blockBuffer == null)
{
blockBuffer = byteBufferPool.acquire(blockLength, false);
BufferUtil.clearToFill(blockBuffer);
}
blockBuffer.put(buffer);
return null;
}
else
{
int limit = buffer.limit();
buffer.limit(buffer.position() + remaining);
ByteBuffer toDecode;
if (blockBuffer != null)
{
blockBuffer.put(buffer);
BufferUtil.flipToFlush(blockBuffer, 0);
toDecode = blockBuffer;
}
else
{
toDecode = buffer;
}
MetaData result = hpackDecoder.decode(toDecode);
buffer.limit(limit);
byteBufferPool.release(blockBuffer);
return result;
}
}
}