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DataGenerator.java
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DataGenerator.java
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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
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.RetainableByteBuffer;
public class DataGenerator
{
private final HeaderGenerator headerGenerator;
public DataGenerator(HeaderGenerator headerGenerator)
{
this.headerGenerator = headerGenerator;
}
public int generate(RetainableByteBuffer.Mutable accumulator, DataFrame frame, int maxLength)
{
return generateData(accumulator, frame.getStreamId(), frame.getByteBuffer(), frame.isEndStream(), maxLength);
}
public int generateData(RetainableByteBuffer.Mutable accumulator, 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(accumulator, 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(accumulator, streamId, slice, false);
}
return Frame.HEADER_LENGTH + length;
}
private void generateFrame(RetainableByteBuffer.Mutable accumulator, int streamId, ByteBuffer data, boolean last)
{
int length = data.remaining();
int flags = Flags.NONE;
if (last)
flags |= Flags.END_STREAM;
headerGenerator.generate(accumulator, FrameType.DATA, Frame.HEADER_LENGTH + length, length, flags, streamId);
// Skip empty data buffers.
if (data.remaining() > 0)
accumulator.add(data);
}
}