How to add/edit file metadata in Golang?
<p>I am writing a Bittorrent client in Go and I would like to save the progress of the download by writing a bitfield to the file headers/metadata. This allows me to cancel the download and restart from where I left off the next time I start downloading. </p>

<p>However, I could not find any standard or third party libraries that allow me to write to file metadata. The closest I have gotten was printing the FileInfo struct returned by os.Stat. I am not sure how to add/edit the FileInfo struct. </p>