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/**
 * Copyright 2012 Alexey Ragozin
 *
 * 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.gridkit.lab.util.shell;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.GZIPInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class ArchHelper {

	public static void uncompressZip(File archive, File destination) throws IOException {
		ZipFile file = new ZipFile(archive);
		Enumeration n = file.entries();
		while(n.hasMoreElements()) {
			ZipEntry entry = n.nextElement();
			File f = new File(destination, entry.getName());
			FileOutputStream fos = new FileOutputStream(f);
			copy(file.getInputStream(entry), fos);
			fos.close();
		}
	}

	public static void uncompressGz(File archive, File destination) throws IOException {
		GZIPInputStream gzin = new GZIPInputStream(new FileInputStream(archive));
		FileOutputStream fos = new FileOutputStream(destination);
		copy(gzin, fos);
		fos.close();
		gzin.close();
	}
	
	static void copy(InputStream in, OutputStream out) throws IOException {
		try {
			byte[] buf = new byte[1 << 12];
			while(true) {
				int n = in.read(buf);
				if(n >= 0) {
					out.write(buf, 0, n);
				}
				else {
					break;
				}
			}
		} finally {
			try {
				in.close();
			}
			catch(Exception e) {
				// ignore
			}
		}
	}		
}