//
// ========================================================================
// Copyright (c) 1995-2017 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.generator;
import java.nio.ByteBuffer;
import org.eclipse.jetty.http2.Flags;
import org.eclipse.jetty.http2.frames.DataFrame;
import org.eclipse.jetty.http2.frames.Frame;
import org.eclipse.jetty.http2.frames.FrameType;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.util.BufferUtil;
public class DataGenerator
{
private final HeaderGenerator headerGenerator;
public DataGenerator(HeaderGenerator headerGenerator)
{
this.headerGenerator = headerGenerator;
}
public int generate(ByteBufferPool.Lease lease, DataFrame frame, int maxLength)
{
return generateData(lease, frame.getStreamId(), frame.getData(), frame.isEndStream(), maxLength);
}
public int generateData(ByteBufferPool.Lease lease, int streamId, ByteBuffer data, boolean last, int maxLength)
{
if (streamId < 0)
throw new IllegalArgumentException("Invalid stream id: " + streamId);
int dataLength = data.remaining();
int maxFrameSize = headerGenerator.getMaxFrameSize();
int length = Math.min(dataLength, Math.min(maxFrameSize, maxLength));
if (length == dataLength)
{
generateFrame(lease, streamId, data, last);
}
else
{
int limit = data.limit();
int newLimit = data.position() + length;
data.limit(newLimit);
ByteBuffer slice = data.slice();
data.position(newLimit);
data.limit(limit);
generateFrame(lease, streamId, slice, false);
}
return Frame.HEADER_LENGTH + length;
}
private void generateFrame(ByteBufferPool.Lease lease, int streamId, ByteBuffer data, boolean last)
{
int length = data.remaining();
int flags = Flags.NONE;
if (last)
flags |= Flags.END_STREAM;
ByteBuffer header = headerGenerator.generate(lease, FrameType.DATA, Frame.HEADER_LENGTH + length, length, flags, streamId);
BufferUtil.flipToFlush(header, 0);
lease.append(header, true);
// Skip empty data buffers.
if (data.remaining() > 0)
lease.append(data, false);
}
}