CBR libraries for Go

Both options are pure Go (no cgo) and read RAR4 and RAR5:

• rardecode (github.com/nwaples/rardecode/v2) is the RAR decoder itself. Its Reader streams entries in archive order, which works for every archive; its fs.FS (OpenFS) can’t open files inside solid archives except the first.
• archives (github.com/mholt/archives) wraps rardecode, bodgit/sevenzip and the standard library behind one fs.FS. It reads solid RAR too, and the same code opens CBZ and CB7.

Neither writes RAR. Write converted comics as CBZ with archive/zip.

• archives Read CBR comic book archives in Go with mholt/archives: open the RAR file as an fs.FS, list pages in natural order, extract the cover, read ComicInfo.xml.
• rardecode Read CBR comic book archives in Go with nwaples/rardecode: pure Go RAR4 and RAR5 decoder. List pages in natural order, extract the cover, read ComicInfo.xml.