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//
// ========================================================================
// Copyright (c) 1995-2012 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.parser;
import java.nio.ByteBuffer;
import org.eclipse.jetty.spdy.CompressionFactory;
import org.eclipse.jetty.spdy.api.Headers;
import org.eclipse.jetty.spdy.api.HeadersInfo;
import org.eclipse.jetty.spdy.api.SPDY;
import org.eclipse.jetty.spdy.frames.ControlFrameType;
import org.eclipse.jetty.spdy.frames.HeadersFrame;
public class HeadersBodyParser extends ControlFrameBodyParser
{
private final Headers headers = new Headers();
private final ControlFrameParser controlFrameParser;
private final HeadersBlockParser headersBlockParser;
private State state = State.STREAM_ID;
private int cursor;
private int streamId;
public HeadersBodyParser(CompressionFactory.Decompressor decompressor, ControlFrameParser controlFrameParser)
{
this.controlFrameParser = controlFrameParser;
this.headersBlockParser = new HeadersHeadersBlockParser(decompressor);
}
@Override
public boolean parse(ByteBuffer buffer)
{
while (buffer.hasRemaining())
{
switch (state)
{
case STREAM_ID:
{
if (buffer.remaining() >= 4)
{
streamId = buffer.getInt() & 0x7F_FF_FF_FF;
state = State.ADDITIONAL;
}
else
{
state = State.STREAM_ID_BYTES;
cursor = 4;
}
break;
}
case STREAM_ID_BYTES:
{
byte currByte = buffer.get();
--cursor;
streamId += (currByte & 0xFF) << 8 * cursor;
if (cursor == 0)
{
streamId &= 0x7F_FF_FF_FF;
state = State.ADDITIONAL;
}
break;
}
case ADDITIONAL:
{
switch (controlFrameParser.getVersion())
{
case SPDY.V2:
{
if (buffer.remaining() >= 2)
{
buffer.getShort();
state = State.HEADERS;
}
else
{
state = State.ADDITIONAL_BYTES;
cursor = 2;
}
break;
}
case SPDY.V3:
{
state = State.HEADERS;
break;
}
default:
{
throw new IllegalStateException();
}
}
break;
}
case ADDITIONAL_BYTES:
{
assert controlFrameParser.getVersion() == SPDY.V2;
buffer.get();
--cursor;
if (cursor == 0)
state = State.HEADERS;
break;
}
case HEADERS:
{
short version = controlFrameParser.getVersion();
int length = controlFrameParser.getLength() - 4;
if (version == SPDY.V2)
length -= 2;
if (headersBlockParser.parse(streamId, version, length, buffer))
{
byte flags = controlFrameParser.getFlags();
if (flags != 0 && flags != HeadersInfo.FLAG_CLOSE && flags != HeadersInfo.FLAG_RESET_COMPRESSION)
throw new IllegalArgumentException("Invalid flag " + flags + " for frame " + ControlFrameType.HEADERS);
HeadersFrame frame = new HeadersFrame(version, flags, streamId, new Headers(headers, true));
controlFrameParser.onControlFrame(frame);
reset();
return true;
}
break;
}
default:
{
throw new IllegalStateException();
}
}
}
return false;
}
private void reset()
{
headers.clear();
state = State.STREAM_ID;
cursor = 0;
streamId = 0;
}
private enum State
{
STREAM_ID, STREAM_ID_BYTES, ADDITIONAL, ADDITIONAL_BYTES, HEADERS
}
private class HeadersHeadersBlockParser extends HeadersBlockParser
{
public HeadersHeadersBlockParser(CompressionFactory.Decompressor decompressor)
{
super(decompressor);
}
@Override
protected void onHeader(String name, String[] values)
{
for (String value : values)
headers.add(name, value);
}
}
}
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