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/*
This file is part of GNUnet.
Copyright (C) 2009,2013 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
package org.gnunet.testbed;
import com.google.common.base.Charsets;
import org.gnunet.util.Configuration;
import java.io.ByteArrayOutputStream;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
/**
* A configuration stored in compressed form.
*/
public class CompressedConfig {
final public byte[] compressedData;
private int uncompressedSize;
/**
* Create a compressed configuration from an uncompressed configuration.
* @param cfg the uncompressed configuration
*/
public CompressedConfig(Configuration cfg) {
byte[] serializedConfig = cfg.serialize().getBytes();
Deflater compresser = new Deflater();
compresser.setInput(serializedConfig);
compresser.finish();
ByteArrayOutputStream s = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
while (!compresser.finished()) {
int n = compresser.deflate(buf);
s.write(buf, 0, n);
}
compressedData = s.toByteArray();
uncompressedSize = serializedConfig.length;
}
/**
* Create a compressed configuration from already compressed data.
* @param compressedData the compressed config data
*/
public CompressedConfig(byte[] compressedData) {
this.compressedData = compressedData;
this.uncompressedSize = -1;
}
/**
* Decompress the configuration.
*
* @return the decompressed configuration, or null on data format error
*/
public Configuration decompress() {
Inflater inflater = new Inflater();
inflater.setInput(compressedData);
ByteArrayOutputStream s = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
while (!inflater.finished()) {
int n;
try {
n = inflater.inflate(buf);
} catch (DataFormatException e) {
return null;
}
s.write(buf, 0, n);
}
String str = new String(s.toByteArray(), Charsets.UTF_8);
Configuration cfg = new Configuration();
cfg.deserialize(str);
return cfg;
}
public int getUncompressedSize() {
if (uncompressedSize == -1) {
uncompressedSize = decompress().serialize().getBytes().length;
}
return uncompressedSize;
}
}
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