63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
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package selfupdate
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import (
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"archive/tar"
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"archive/zip"
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"bytes"
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"compress/gzip"
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"fmt"
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"io"
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"io/ioutil"
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"strings"
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)
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func uncompress(src io.Reader, url, cmd string) (io.Reader, error) {
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if strings.HasSuffix(url, ".zip") {
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// Zip format requires its file size for uncompressing.
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// So we need to read the HTTP response into a buffer at first.
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buf, err := ioutil.ReadAll(src)
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if err != nil {
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return nil, err
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}
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r := bytes.NewReader(buf)
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z, err := zip.NewReader(r, r.Size())
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if err != nil {
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return nil, err
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}
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for _, file := range z.File {
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if file.Name == cmd {
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return file.Open()
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}
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}
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return nil, fmt.Errorf("File '%s' for the command is not found in %s", cmd, url)
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} else if strings.HasSuffix(url, ".gzip") {
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return gzip.NewReader(src)
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} else if strings.HasSuffix(url, ".tar.gz") {
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gz, err := gzip.NewReader(src)
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if err != nil {
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return nil, err
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}
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t := tar.NewReader(gz)
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for {
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h, err := t.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return nil, err
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}
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if h.Name == cmd {
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return t, nil
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}
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}
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return nil, fmt.Errorf("File '%s' for the command is not found in %s", cmd, url)
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}
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return src, nil
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}
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