/*
* Copyright 2012-2014 Brian Campbell
*
* Licensed 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.jose4j.zip;
import org.jose4j.keys.KeyPersuasion;
import org.jose4j.lang.JoseException;
import org.jose4j.lang.UncheckedJoseException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
/**
*/
public class DeflateRFC1951CompressionAlgorithm implements CompressionAlgorithm
{
public byte[] compress(byte[] data)
{
Deflater deflater = new Deflater(Deflater.DEFLATED, true);
try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
DeflaterOutputStream deflaterOutputStream = new DeflaterOutputStream(byteArrayOutputStream, deflater))
{
deflaterOutputStream.write(data);
deflaterOutputStream.finish();
return byteArrayOutputStream.toByteArray();
}
catch (IOException e)
{
throw new UncheckedJoseException("Problem compressing data.", e);
}
}
public byte[] decompress(byte[] compressedData) throws JoseException
{
Inflater inflater = new Inflater(true);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
try (InflaterInputStream iis = new InflaterInputStream(new ByteArrayInputStream(compressedData), inflater))
{
int bytesRead;
byte[] buff = new byte[256];
while ((bytesRead = iis.read(buff)) != -1)
{
byteArrayOutputStream.write(buff, 0, bytesRead);
}
return byteArrayOutputStream.toByteArray();
}
catch (IOException e)
{
throw new JoseException("Problem decompressing data.", e);
}
}
@Override
public String getJavaAlgorithm()
{
return null;
}
@Override
public String getAlgorithmIdentifier()
{
return CompressionAlgorithmIdentifiers.DEFLATE;
}
@Override
public KeyPersuasion getKeyPersuasion()
{
return KeyPersuasion.NONE;
}
@Override
public String getKeyType()
{
return null;
}
@Override
public boolean isAvailable()
{
return true;
}
}