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
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
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