Java Ungzip File ungzip(File gzip, File toDir)

Description

ungzip

License

Apache License

Declaration

public static File ungzip(File gzip, File toDir) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Apache License 

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.zip.GZIPInputStream;

public class Main {
    public static File ungzip(File gzip, File toDir) throws IOException {
        toDir.mkdirs();/*from w w  w . java2s  .  c o  m*/
        File out = new File(toDir, gzip.getName());
        GZIPInputStream gin = null;
        FileOutputStream fout = null;
        try {
            FileInputStream fin = new FileInputStream(gzip);
            gin = new GZIPInputStream(fin);
            fout = new FileOutputStream(out);
            copy(gin, fout);
            gin.close();
            fout.close();
        } finally {
            closeQuietly(gin);
            closeQuietly(fout);
        }
        return out;
    }

    private static int copy(InputStream input, OutputStream output) throws IOException {
        long count = copyStream(input, output);
        if (count > 2147483647L) {
            return -1;
        }
        return (int) count;
    }

    private static void closeQuietly(OutputStream output) {
        try {
            if (output != null) {
                output.close();
            }
        } catch (IOException localIOException) {
        }
    }

    private static void closeQuietly(InputStream input) {
        try {
            if (input != null) {
                input.close();
            }
        } catch (IOException localIOException) {
        }
    }

    private static long copyStream(InputStream input, OutputStream output) throws IOException {
        byte[] buffer = new byte[1024];
        long count = 0L;
        int n = 0;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        return count;
    }
}

Related

1. unGzip(File inFile, File outFile)
2. unGzip(File sourceZipFile, String destFolder, String destFile)
3. unGzip(final File compressedInputFile, final File outputDir)
4. unGzip(final File inputFile, final File outputDir)