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/**
 * 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.rs.security.saml;

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 class DeflateEncoderDecoder {
    public InputStream inflateToken(byte[] deflatedToken) 
        throws DataFormatException {
        Inflater inflater = new Inflater(true);
        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 byte[] deflateToken(byte[] tokenBytes) {
        Deflater compresser = new Deflater(Deflater.DEFLATED, true);
        
        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;
    }
}