does it support multi-volumes decompression?

[wotmshuaisi]

can this project deal with files like this?

a.7z.001
a.7z.002
a.7z.003
a.7z.004

[bodgit]

Not directly, no.

However the library just wants something that implements the io.ReaderAt interface and as the archive is just the concatenation of its parts, all you need is something similar to io.MultiReader() to join the parts/volumes together but with the right interface. Thankfully such a thing already exists in readerutil.NewMultiReaderAt(). The following code works:

package main

import (
	"errors"
	"io"
	"log"
	"os"

	"github.com/bodgit/sevenzip"
	"go4.org/readerutil"
)

func main() {
	sr := make([]readerutil.SizeReaderAt, 0, len(os.Args[1:]))
	for _, part := range os.Args[1:] {
		f, err := os.Open(part)
		if err != nil {
			log.Fatal(err)
		}
		defer f.Close()

		size, ok := readerutil.Size(f)
		if !ok {
			log.Fatal(errors.New("unable to calculate size"))
		}
		sr = append(sr, io.NewSectionReader(f, 0, size))
	}

	mr := readerutil.NewMultiReaderAt(sr...)

	r, err := sevenzip.NewReader(mr, mr.Size())
	if err != nil {
		log.Fatal(err)
	}

	// Do something with r
}

I'm undecided whether to add this functionality to the library but the above code will work regardless.

[bodgit]

I've merged support for dealing with multiple volumes, just open the file of the first volume, i.e.:

r, err := sevenzip.OpenReader("archive.7z.001")
if err != nil {
        log.Fatal(err)
}
defer r.Close()

[wotmshuaisi]

thanks a lot