12 "github.com/anacrolix/torrent/storage"
14 "github.com/anacrolix/tagflag"
15 "github.com/edsrzf/mmap-go"
17 "github.com/anacrolix/torrent/metainfo"
18 "github.com/anacrolix/torrent/mmap_span"
21 func mmapFile(name string) (mm storage.FileMapping, err error) {
22 f, err := os.Open(name)
38 reg, err := mmap.MapRegion(f, -1, mmap.RDONLY, mmap.COPY, 0)
42 return storage.WrapFileMapping(reg, f), nil
45 func verifyTorrent(info *metainfo.Info, root string) error {
46 span := new(mmap_span.MMapSpan)
47 for _, file := range info.UpvertedFiles() {
48 filename := filepath.Join(append([]string{root, info.Name}, file.Path...)...)
49 mm, err := mmapFile(filename)
53 if int64(len(mm.Bytes())) != file.Length {
54 return fmt.Errorf("file %q has wrong length", filename)
59 for i, numPieces := 0, info.NumPieces(); i < numPieces; i += 1 {
62 _, err := io.Copy(hash, io.NewSectionReader(span, p.Offset(), p.Length()))
66 good := bytes.Equal(hash.Sum(nil), p.Hash().Bytes())
68 return fmt.Errorf("hash mismatch at piece %d", i)
70 fmt.Printf("%d: %v: %v\n", i, p.Hash(), good)
76 log.SetFlags(log.Flags() | log.Lshortfile)
83 metaInfo, err := metainfo.LoadFromFile(flags.TorrentFile)
87 info, err := metaInfo.UnmarshalInfo()
89 log.Fatalf("error unmarshalling info: %s", err)
91 err = verifyTorrent(&info, flags.DataDir)
93 log.Fatalf("torrent failed verification: %s", err)