anon.proxy
Class DecompressionProxyCallback

java.lang.Object
  anon.proxy.DecompressionProxyCallback

All Implemented Interfaces:

ProxyCallback

public class DecompressionProxyCallback
extends java.lang.Object
implements ProxyCallback

This class provides functionality for inflating zlib- or gzip-compressed content. Due to http header replacement the JonDo may specify some content-encodings which a client (i.e wget) does not support. In this case the JonDo decodes the content itself using this class. To use its functionality, an object of this class must be registered in the PoxyCallback-framework.

Author:

Simon Pecher

Nested Class Summary

private static class

DecompressionProxyCallback.DecompressionKit

Field Summary

(package private) java.util.Hashtable	decompressionKits
private static int	FCOMMENT
private static int	FEXTRA
private static int	FHCRC these constants are copied from GZIPInputstream because they are declared private there.
private static int	FNAME
private int	MAX_DECOMPRESSION_OUTPUT

Fields inherited from interface anon.proxy.ProxyCallback

STATUS_DELAY, STATUS_FINISHED, STATUS_PROCESSABLE

Constructor Summary

DecompressionProxyCallback()

Method Summary

void	closeRequest(AnonProxyRequest anonRequest)
int	handleDownstreamChunk(AnonProxyRequest anonRequest, ProxyCallbackBuffer buffer)
int	handleUpstreamChunk(AnonProxyRequest anonRequest, ProxyCallbackBuffer buffer)
private int	readGZIPHeader(byte[] data, int offset, int length) slightly modified version of private method GZIPInputStream.readHeader to extract the GZIP header fields.
private int	toUnsignedByte(byte nByte)
private int	toUnsignedShort(byte lower, byte upper)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

decompressionKits

java.util.Hashtable decompressionKits

FHCRC

private static final int FHCRC

these constants are copied from GZIPInputstream because they are declared private there.

See Also:

Constant Field Values

FEXTRA

private static final int FEXTRA

See Also:

Constant Field Values

FNAME

private static final int FNAME

See Also:

Constant Field Values

FCOMMENT

private static final int FCOMMENT

See Also:

Constant Field Values

MAX_DECOMPRESSION_OUTPUT

private final int MAX_DECOMPRESSION_OUTPUT

See Also:

Constant Field Values

Constructor Detail

DecompressionProxyCallback

public DecompressionProxyCallback()

Method Detail

readGZIPHeader

private int readGZIPHeader(byte[] data,
                           int offset,
                           int length)
                    throws java.util.zip.DataFormatException

slightly modified version of private method GZIPInputStream.readHeader to extract the GZIP header fields. returns the length of the header in bytes.

Throws:

java.util.zip.DataFormatException

toUnsignedShort

private int toUnsignedShort(byte lower,
                            byte upper)

toUnsignedByte

private int toUnsignedByte(byte nByte)

closeRequest

public void closeRequest(AnonProxyRequest anonRequest)

Specified by:

closeRequest in interface ProxyCallback

handleDownstreamChunk

public int handleDownstreamChunk(AnonProxyRequest anonRequest,
                                 ProxyCallbackBuffer buffer)
                          throws ProxyCallbackNotProcessableException

Specified by:

handleDownstreamChunk in interface ProxyCallback

Throws:

ProxyCallbackNotProcessableException

handleUpstreamChunk

public int handleUpstreamChunk(AnonProxyRequest anonRequest,
                               ProxyCallbackBuffer buffer)
                        throws ProxyCallbackNotProcessableException

Specified by:

handleUpstreamChunk in interface ProxyCallback

Throws:

ProxyCallbackNotProcessableException