[issue17681] Work with an extra field of gzip and zip files

[Benjamin Sergeant]

Benjamin Sergeant  added the comment:

There is a comment field too which would be nice to support.

The Go gzip module has a Header class that describe all the metadata. I see in 
3.8 mtime was made configurable, so hopefully we can add comment and extra.

https://golang.org/pkg/compress/gzip/#Header

For our purpose we'd like to put arbitrary stuff in a gzip file but it is 
complicated to do so, I might use the patch here and apply to the python gzip 
module, but that feels a bit  hackish.

--
nosy: +Benjamin.Sergeant

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[issue17681] Work with an extra field of gzip and zip files

[Benjamin Sergeant]

Benjamin Sergeant  added the comment:

type Header struct {
Comment string// comment
Extra   []byte// "extra data"
ModTime time.Time // modification time
Namestring// file name
OS  byte  // operating system type
}

This is what the header/extra things look like for reference.

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