How can I use the “compress/gzip” package to gzip a file?

Question

I\'m new to Go, and can\'t figure out how to use the compress/gzip package to my advantage. Basically, I just want to write something to a file, gzip it and rea

Answer 1

Here the func for unpack gzip file to destination file:

func UnpackGzipFile(gzFilePath, dstFilePath string) (int64, error) {
    gzFile, err := os.Open(gzFilePath)
    if err != nil {
        return 0, fmt.Errorf("Failed to open file %s for unpack: %s", gzFilePath, err)
    }
    dstFile, err := os.OpenFile(dstFilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0660)
    if err != nil {
        return 0, fmt.Errorf("Failed to create destination file %s for unpack: %s", dstFilePath, err)
    }

    ioReader, ioWriter := io.Pipe()

    go func() { // goroutine leak is possible here
        gzReader, _ := gzip.NewReader(gzFile)
        // it is important to close the writer or reading from the other end of the
        // pipe or io.copy() will never finish
        defer func(){
            gzFile.Close()
            gzReader.Close()
            ioWriter.Close()
        }()

        io.Copy(ioWriter, gzReader)
    }()

    written, err := io.Copy(dstFile, ioReader)
    if err != nil {
        return 0, err // goroutine leak is possible here
    }
    ioReader.Close()
    dstFile.Close()

    return written, nil
}