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//========================================================================
//Copyright 2011-2012 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 java.nio.charset.Charset;
import java.util.zip.ZipException;
import org.eclipse.jetty.spdy.CompressionDictionary;
import org.eclipse.jetty.spdy.CompressionFactory;
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;
public abstract class HeadersBlockParser
{
private final CompressionFactory.Decompressor decompressor;
private byte[] data;
private boolean needsDictionary = true;
protected HeadersBlockParser(CompressionFactory.Decompressor decompressor)
{
this.decompressor = decompressor;
}
public boolean parse(int streamId, short version, int length, ByteBuffer buffer)
{
// Need to be sure that all the compressed data has arrived
// Because SPDY uses SYNC_FLUSH mode, and the Java API
// does not expose when decompression is finished with this mode
// (but only when using NO_FLUSH), then we need to
// accumulate the compressed bytes until we have all of them
boolean accumulated = accumulate(length, buffer);
if (!accumulated)
return false;
byte[] compressedHeaders = data;
data = null;
ByteBuffer decompressedHeaders = decompress(version, compressedHeaders);
Charset iso1 = Charset.forName("ISO-8859-1");
// We know the decoded bytes contain the full headers,
// so optimize instead of looping byte by byte
int count = readCount(version, decompressedHeaders);
for (int i = 0; i < count; ++i)
{
int nameLength = readNameLength(version, decompressedHeaders);
if (nameLength == 0)
throw new StreamException(streamId, StreamStatus.PROTOCOL_ERROR, "Invalid header name length");
byte[] nameBytes = new byte[nameLength];
decompressedHeaders.get(nameBytes);
String name = new String(nameBytes, iso1);
int valueLength = readValueLength(version, decompressedHeaders);
if (valueLength == 0)
throw new StreamException(streamId, StreamStatus.PROTOCOL_ERROR, "Invalid header value length");
byte[] valueBytes = new byte[valueLength];
decompressedHeaders.get(valueBytes);
String value = new String(valueBytes, iso1);
// Multi valued headers are separate by NUL
String[] values = value.split("\u0000");
// Check if there are multiple NULs (section 2.6.9)
for (String v : values)
if (v.length() == 0)
throw new StreamException(streamId, StreamStatus.PROTOCOL_ERROR, "Invalid multi valued header");
onHeader(name, values);
}
return true;
}
private boolean accumulate(int length, ByteBuffer buffer)
{
int remaining = buffer.remaining();
if (data == null)
{
if (remaining < length)
{
data = new byte[remaining];
buffer.get(data);
return false;
}
else
{
data = new byte[length];
buffer.get(data);
return true;
}
}
else
{
int accumulated = data.length;
int needed = length - accumulated;
if (remaining < needed)
{
byte[] local = new byte[accumulated + remaining];
System.arraycopy(data, 0, local, 0, accumulated);
buffer.get(local, accumulated, remaining);
data = local;
return false;
}
else
{
byte[] local = new byte[length];
System.arraycopy(data, 0, local, 0, accumulated);
buffer.get(local, accumulated, needed);
data = local;
return true;
}
}
}
private int readCount(int version, ByteBuffer buffer)
{
switch (version)
{
case SPDY.V2:
return buffer.getShort();
case SPDY.V3:
return buffer.getInt();
default:
throw new IllegalStateException();
}
}
private int readNameLength(int version, ByteBuffer buffer)
{
return readCount(version, buffer);
}
private int readValueLength(int version, ByteBuffer buffer)
{
return readCount(version, buffer);
}
protected abstract void onHeader(String name, String[] values);
private ByteBuffer decompress(short version, byte[] compressed)
{
// Differently from compression, decompression always happens
// non-concurrently because we read and parse with a single
// thread, and therefore there is no need for synchronization.
try
{
byte[] decompressed = null;
byte[] buffer = new byte[compressed.length * 2];
decompressor.setInput(compressed);
while (true)
{
int count = decompressor.decompress(buffer);
if (count == 0)
{
if (decompressed != null)
{
return ByteBuffer.wrap(decompressed);
}
else if (needsDictionary)
{
decompressor.setDictionary(CompressionDictionary.get(version));
needsDictionary = false;
}
else
{
throw new IllegalStateException();
}
}
else
{
if (count < buffer.length)
{
if (decompressed == null)
{
// Only one pass was needed to decompress
return ByteBuffer.wrap(buffer, 0, count);
}
else
{
// Last pass needed to decompress, merge decompressed bytes
byte[] result = new byte[decompressed.length + count];
System.arraycopy(decompressed, 0, result, 0, decompressed.length);
System.arraycopy(buffer, 0, result, decompressed.length, count);
return ByteBuffer.wrap(result);
}
}
else
{
if (decompressed == null)
{
decompressed = buffer;
buffer = new byte[buffer.length];
}
else
{
byte[] result = new byte[decompressed.length + buffer.length];
System.arraycopy(decompressed, 0, result, 0, decompressed.length);
System.arraycopy(buffer, 0, result, decompressed.length, buffer.length);
decompressed = result;
}
}
}
}
}
catch (ZipException x)
{
// We had a compression problem, and since the compression context
// is per-connection, we need to tear down the connection
throw new SessionException(SessionStatus.PROTOCOL_ERROR, x);
}
}
}
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