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/*
* Copyright (c) 2010 Remko Tron¨on
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
/*
* Copyright (c) 2011, Isode Limited, London, England.
* All rights reserved.
*/
package com.isode.stroke.compress;
import com.isode.stroke.base.ByteArray;
import com.jcraft.jzlib.JZlib;
import com.jcraft.jzlib.ZStream;
public abstract class ZLibCodecompressor {
protected final int CHUNK_SIZE = 1024;
protected final ZStream stream_ = new ZStream();
public ByteArray process(ByteArray input) throws ZLibException {
ByteArray output = new ByteArray();
stream_.avail_in = input.getSize();
stream_.next_in = input.getData();
stream_.next_in_index = 0;
do {
byte[] outputArray = new byte[CHUNK_SIZE];
stream_.avail_out = CHUNK_SIZE;
stream_.next_out = outputArray;
stream_.next_out_index = 0;
int result = processZStream();
if (result != JZlib.Z_OK && result != JZlib.Z_BUF_ERROR) {
throw new ZLibException(/* stream_.msg */);
}
output.append(outputArray, CHUNK_SIZE - stream_.avail_out);
}
while (stream_.avail_out == 0);
if (stream_.avail_in != 0) {
throw new ZLibException();
}
return output;
}
protected abstract int processZStream();
}
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