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/**
* Copyright 2017 CMCC Technologies Co., Ltd
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.onap.vfc.nfvo.emsdriver.commons.utils;
import java.io.*;
import java.util.zip.GZIPInputStream;
public class Gunzip {
public void unCompress(String gzFileName, String toFile) throws IOException {
try ( FileInputStream gzInput = new FileInputStream(gzFileName);
GZIPInputStream gzIn = new GZIPInputStream(gzInput)){
File tofile = new File(toFile);
enable(tofile);
try(FileOutputStream fileOutput = new FileOutputStream(tofile, false)){
moveBytes(gzIn, fileOutput, -1, -1, 1024);
}
}catch(IOException e){
throw new IOException ("Gunzip", e);
}
}
private void enable(File tofile) throws IOException {
if (!tofile.exists()) {
String parentPath = tofile.getParent();
if (parentPath != null)
new File(parentPath).mkdirs();
tofile.createNewFile();
}
}
public long moveBytes(InputStream input, OutputStream output, long off, long len, int bufsize) throws IOException {
/* long skipped=0;
if (off > 0)
skipped = input.skip(off); // check if skipped is same as off
*/
long totalNum = 0;
byte[] buf = new byte[bufsize];
while (true) {
if (len > 0 && (len - totalNum) <= 0)
break;
else if (len > 0 && bufsize > (len - totalNum))
bufsize = (int) (len - totalNum);
int readNum = input.read(buf, 0, bufsize);
if (readNum <= 0)
break;
output.write(buf, 0, readNum);
totalNum += readNum;
}
return totalNum;
}
}
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