Golang从字节解压缩gzip.Reader

Question

I have a file struct that holds a body which is just a *bytes.Reader I have two methods on the struct Zip() error and UnZip() error. When I call Zip it should zip the file storing the zipped data in body and I should be able to call UnZip on the same file and store the unzipped data in the body.

The minimal example I have is below in the playground. https://play.golang.org/p/WmZtqtvnyN

I'm able to zip the file just fine and looks like it's doing what it's supposed to do; however, when I try and unzip the file I get unexpected EOF

I've been going at this for hours now. Any help is greatly appreciated.

Answer 1

I believe you should close gzip writer before geting bytes from the underlying buffer.

func (f *File) Zip() error {
    buff := bytes.NewBuffer(nil)

    writer := gzip.NewWriter(buff)
    defer writer.Close()

    _, err := f.Body.WriteTo(writer)
    if err != nil {
        return err
    }

    writer.Close() // I have added this line

    f.Body = bytes.NewReader(buff.Bytes())
    f.Name = fmt.Sprintf("%s.gz", f.Name)
    return nil
}