/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cxf.common.util;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.SequenceInputStream;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
public final class CompressionUtils {
private CompressionUtils() {
}
public static InputStream inflate(byte[] deflatedToken)
throws DataFormatException {
return inflate(deflatedToken, true);
}
public static InputStream inflate(byte[] deflatedToken, boolean nowrap)
throws DataFormatException {
Inflater inflater = new Inflater(nowrap);
inflater.setInput(deflatedToken);
byte[] input = new byte[deflatedToken.length * 2];
int inflatedLen = 0;
int inputLen = 0;
byte[] inflatedToken = input;
while (!inflater.finished()) {
inputLen = inflater.inflate(input);
if (!inflater.finished()) {
if (inputLen == 0) {
if (inflater.needsInput()) {
throw new DataFormatException("Inflater can not inflate all the token bytes");
} else {
break;
}
}
inflatedToken = new byte[input.length + inflatedLen];
System.arraycopy(input, 0, inflatedToken, inflatedLen, inputLen);
inflatedLen += inputLen;
}
}
InputStream is = new ByteArrayInputStream(input, 0, inputLen);
if (inflatedToken != input) {
is = new SequenceInputStream(new ByteArrayInputStream(inflatedToken, 0, inflatedLen),
is);
}
return is;
}
public static byte[] deflate(byte[] tokenBytes) {
return deflate(tokenBytes, true);
}
public static byte[] deflate(byte[] tokenBytes, boolean nowrap) {
Deflater compresser = new Deflater(Deflater.DEFLATED, nowrap);
compresser.setInput(tokenBytes);
compresser.finish();
byte[] output = new byte[tokenBytes.length * 2];
int compressedDataLength = compresser.deflate(output);
byte[] result = new byte[compressedDataLength];
System.arraycopy(output, 0, result, 0, compressedDataLength);
return result;
}
}