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/*
* Copyright (c) 2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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.ReplyInfo;
import org.eclipse.jetty.spdy.api.SPDY;
import org.eclipse.jetty.spdy.frames.ControlFrameType;
import org.eclipse.jetty.spdy.frames.SynReplyFrame;
public class SynReplyBodyParser 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 SynReplyBodyParser(CompressionFactory.Decompressor decompressor, ControlFrameParser controlFrameParser)
{
this.controlFrameParser = controlFrameParser;
this.headersBlockParser = new SynReplyHeadersBlockParser(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() - getSynReplyDataLength(version);
if (headersBlockParser.parse(streamId, version, length, buffer))
{
byte flags = controlFrameParser.getFlags();
if (flags != 0 && flags != ReplyInfo.FLAG_CLOSE)
throw new IllegalArgumentException("Invalid flag " + flags + " for frame " + ControlFrameType.SYN_REPLY);
SynReplyFrame frame = new SynReplyFrame(version, flags, streamId, new Headers(headers, true));
controlFrameParser.onControlFrame(frame);
reset();
return true;
}
break;
}
default:
{
throw new IllegalStateException();
}
}
}
return false;
}
private int getSynReplyDataLength(short version)
{
switch (version)
{
case 2:
return 6;
case 3:
return 4;
default:
throw new IllegalStateException();
}
}
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 SynReplyHeadersBlockParser extends HeadersBlockParser
{
public SynReplyHeadersBlockParser(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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