tar是用于文件归档,gzip用于压缩。仅仅用tar的话,达不到压缩的目的。我们常见的tar.gz就是用gzip压缩生成的tar归档文件。
go实现tar压缩与解压与zip类似,区别在于tar需要使用gzip进行处理。tar与zip的Header不同。代码如下
package tartest import ( "archive/tar" "compress/gzip" "io" "os" "strings" ) //压缩 使用gzip压缩成tar.gz func Compress(files []*os.File, dest string) error { d, _ := os.Create(dest) defer d.Close() gw := gzip.NewWriter(d) defer gw.Close() tw := tar.NewWriter(gw) defer tw.Close() for _, file := range files { err := compress(file, "", tw) if err != nil { return err } } return nil } func compress(file *os.File, prefix string, tw *tar.Writer) error { info, err := file.Stat() if err != nil { return err } if info.IsDir() { prefix = prefix + "/" + info.Name() fileInfos, err := file.Readdir(-1) if err != nil { return err } for _, fi := range fileInfos { f, err := os.Open(file.Name() + "/" + fi.Name()) if err != nil { return err } err = compress(f, prefix, tw) if err != nil { return err } } } else { header, err := tar.FileInfoHeader(info, "") header.Name = prefix + "/" + header.Name if err != nil { return err } err = tw.WriteHeader(header) if err != nil { return err } _, err = io.Copy(tw, file) file.Close() if err != nil { return err } } return nil } //解压 tar.gz func DeCompress(tarFile, dest string) error { srcFile, err := os.Open(tarFile) if err != nil { return err } defer srcFile.Close() gr, err := gzip.NewReader(srcFile) if err != nil { return err } defer gr.Close() tr := tar.NewReader(gr) for { hdr, err := tr.Next() if err != nil { if err == io.EOF { break } else { return err } } filename := dest + hdr.Name file, err := createFile(filename) if err != nil { return err } io.Copy(file, tr) } return nil } func createFile(name string) (*os.File, error) { err := os.MkdirAll(string([]rune(name)[0:strings.LastIndex(name, "/")]), 0755) if err != nil { return nil, err } return os.Create(name) }
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