| // |
| // ======================================================================== |
| // Copyright (c) 1995-2016 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.StreamException; |
| import org.eclipse.jetty.spdy.api.SPDY; |
| import org.eclipse.jetty.spdy.api.SessionStatus; |
| import org.eclipse.jetty.spdy.api.StreamStatus; |
| import org.eclipse.jetty.spdy.frames.ControlFrame; |
| import org.eclipse.jetty.spdy.frames.SynStreamFrame; |
| import org.eclipse.jetty.util.BufferUtil; |
| |
| public class SynStreamGenerator extends ControlFrameGenerator |
| { |
| private final HeadersBlockGenerator headersBlockGenerator; |
| |
| public SynStreamGenerator(ByteBufferPool bufferPool, HeadersBlockGenerator headersBlockGenerator) |
| { |
| super(bufferPool); |
| this.headersBlockGenerator = headersBlockGenerator; |
| } |
| |
| @Override |
| public ByteBuffer generate(ControlFrame frame) |
| { |
| SynStreamFrame synStream = (SynStreamFrame)frame; |
| short version = synStream.getVersion(); |
| |
| ByteBuffer headersBuffer = headersBlockGenerator.generate(version, synStream.getHeaders()); |
| |
| int frameBodyLength = 10; |
| |
| 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(synStream, frameLength, buffer); |
| |
| int streamId = synStream.getStreamId(); |
| buffer.putInt(streamId & 0x7F_FF_FF_FF); |
| buffer.putInt(synStream.getAssociatedStreamId() & 0x7F_FF_FF_FF); |
| writePriority(streamId, version, synStream.getPriority(), buffer); |
| buffer.put((byte)synStream.getSlot()); |
| |
| buffer.put(headersBuffer); |
| |
| buffer.flip(); |
| return buffer; |
| } |
| |
| private void writePriority(int streamId, short version, byte priority, ByteBuffer buffer) |
| { |
| switch (version) |
| { |
| case SPDY.V2: |
| priority <<= 6; |
| break; |
| case SPDY.V3: |
| priority <<= 5; |
| break; |
| default: |
| throw new StreamException(streamId, StreamStatus.UNSUPPORTED_VERSION); |
| } |
| buffer.put(priority); |
| } |
| } |