Why Does Deferring GZIP Writer Closure Lead to Data Loss?
Deferring GZIP Writer Closure Results in Data Loss
Background:
When working with gzip, utilizing gzip.NewWriter to compress data and deferring Close() to close the writer can lead to a loss of compressed data.
Issue:
Deferring the closure of the GZIP writer causes the missing of the GZIP footer. As specified in the Close function documentation:
Close closes the Writer by flushing any unwritten data to the underlying io.Writer and writing the GZIP footer. It does not close the underlying io.Writer.
Solution:
To prevent data loss, close the GZIP writer before returning the compressed data:
<code class="go">func zipData(originData []byte) ([]byte, error) {
var bf bytes.Buffer
gw := gzip.NewWriter(&bf)
_, err := gw.Write(originData)
if err != nil {
return nil, errors.New(fmt.Sprintf("gzip data err: %v", err))
}
err = gw.Flush()
if err != nil {
return nil, err
}
if err := gw.Close(); err != nil {
return nil, errors.New(fmt.Sprintf("close data err: %v", err))
}
return bf.Bytes(), nil
}</code>The above is the detailed content of Why Does Deferring GZIP Writer Closure Lead to Data Loss?. For more information, please follow other related articles on the PHP Chinese website!
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