Golang : Create zip/ePub file without compression(use Store algorithm)
Problem :
You need to create zip file without compression. i.e just use the Store algorithm. For example, you are trying to create ePub file, which only uses Store algorithm.
Solution :
By default, Golang's archive/zip
package uses the Store(no compression) algorithm. However, it is best not to assume that the default will always be the same after upgrade. To ensure that the zip/ePub file that are created with Store algorithm. Use the zip.CreateHeader()
function with the following line :
...
header, err := zip.FileInfoHeader(info)
if err != nil {
return err
}
header.Method = zip.Store // <<<----- here
writer, err := zipit.CreateHeader(header)
if err != nil {
return err
}
or if you want to add more data to the header.
writer, err := zipwriter.CreateHeader(&zip.FileHeader{
Name: filename,
Method: zip.Store,
})
See full example on how to create zip file at : https://www.socketloop.com/tutorials/zip-compress-file-in-go
References :
https://www.socketloop.com/tutorials/zip-compress-file-in-go
See also : Golang : How to tell if a file is compressed either gzip or zip ?
By Adam Ng
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