12 "github.com/anacrolix/tagflag"
13 "github.com/edsrzf/mmap-go"
15 "github.com/anacrolix/torrent/metainfo"
16 "github.com/anacrolix/torrent/mmap_span"
17 "github.com/anacrolix/torrent/storage"
20 func mmapFile(name string) (mm storage.FileMapping, err error) {
21 f, err := os.Open(name)
37 reg, err := mmap.MapRegion(f, -1, mmap.RDONLY, mmap.COPY, 0)
41 return storage.WrapFileMapping(reg, f), nil
44 func verifyTorrent(info *metainfo.Info, root string) error {
45 span := new(mmap_span.MMapSpan)
46 for _, file := range info.UpvertedFiles() {
47 filename := filepath.Join(append([]string{root, info.Name}, file.Path...)...)
48 mm, err := mmapFile(filename)
52 if int64(len(mm.Bytes())) != file.Length {
53 return fmt.Errorf("file %q has wrong length", filename)
58 for i, numPieces := 0, info.NumPieces(); i < numPieces; i += 1 {
61 _, err := io.Copy(hash, io.NewSectionReader(span, p.Offset(), p.Length()))
65 good := bytes.Equal(hash.Sum(nil), p.Hash().Bytes())
67 return fmt.Errorf("hash mismatch at piece %d", i)
69 fmt.Printf("%d: %v: %v\n", i, p.Hash(), good)
75 log.SetFlags(log.Flags() | log.Lshortfile)
82 metaInfo, err := metainfo.LoadFromFile(flags.TorrentFile)
86 info, err := metaInfo.UnmarshalInfo()
88 log.Fatalf("error unmarshalling info: %s", err)
90 err = verifyTorrent(&info, flags.DataDir)
92 log.Fatalf("torrent failed verification: %s", err)