12 "github.com/anacrolix/tagflag"
13 "github.com/edsrzf/mmap-go"
15 "github.com/anacrolix/torrent/metainfo"
16 "github.com/anacrolix/torrent/mmap_span"
19 func mmapFile(name string) (mm mmap.MMap, err error) {
20 f, err := os.Open(name)
32 return mmap.MapRegion(f, -1, mmap.RDONLY, mmap.COPY, 0)
35 func verifyTorrent(info *metainfo.Info, root string) error {
36 span := new(mmap_span.MMapSpan)
37 for _, file := range info.UpvertedFiles() {
38 filename := filepath.Join(append([]string{root, info.Name}, file.Path...)...)
39 mm, err := mmapFile(filename)
43 if int64(len(mm)) != file.Length {
44 return fmt.Errorf("file %q has wrong length", filename)
49 for i, numPieces := 0, info.NumPieces(); i < numPieces; i += 1 {
52 _, err := io.Copy(hash, io.NewSectionReader(span, p.Offset(), p.Length()))
56 good := bytes.Equal(hash.Sum(nil), p.Hash().Bytes())
58 return fmt.Errorf("hash mismatch at piece %d", i)
60 fmt.Printf("%d: %v: %v\n", i, p.Hash(), good)
66 log.SetFlags(log.Flags() | log.Lshortfile)
73 metaInfo, err := metainfo.LoadFromFile(flags.TorrentFile)
77 info, err := metaInfo.UnmarshalInfo()
79 log.Fatalf("error unmarshalling info: %s", err)
81 err = verifyTorrent(&info, flags.DataDir)
83 log.Fatalf("torrent failed verification: %s", err)