13 "github.com/bradfitz/iter"
14 "github.com/edsrzf/mmap-go"
16 "github.com/anacrolix/torrent/metainfo"
17 "github.com/anacrolix/torrent/mmap_span"
21 torrentPath = flag.String("torrent", "/path/to/the.torrent", "path of the torrent file")
22 dataPath = flag.String("path", "/torrent/data", "path of the torrent data")
25 func fileToMmap(filename string, length int64) mmap.MMap {
26 osFile, err := os.Open(filename)
27 if os.IsNotExist(err) {
33 goMMap, err := mmap.MapRegion(osFile, int(length), mmap.RDONLY, mmap.COPY, 0)
37 if int64(len(goMMap)) != length {
38 log.Printf("file mmap has wrong size: %#v", filename)
46 log.SetFlags(log.Flags() | log.Lshortfile)
48 metaInfo, err := metainfo.LoadFromFile(*torrentPath)
52 mMapSpan := &mmap_span.MMapSpan{}
53 if len(metaInfo.Info.Files) > 0 {
54 for _, file := range metaInfo.Info.Files {
55 filename := filepath.Join(append([]string{*dataPath, metaInfo.Info.Name}, file.Path...)...)
56 goMMap := fileToMmap(filename, file.Length)
57 mMapSpan.Append(goMMap)
59 log.Println(len(metaInfo.Info.Files))
61 goMMap := fileToMmap(*dataPath, metaInfo.Info.Length)
62 mMapSpan.Append(goMMap)
64 log.Println(mMapSpan.Size())
65 log.Println(len(metaInfo.Info.Pieces))
67 for i := range iter.N(metaInfo.Info.NumPieces()) {
70 _, err := io.Copy(hash, io.NewSectionReader(mMapSpan, p.Offset(), p.Length()))
74 fmt.Printf("%d: %x: %v\n", i, p.Hash(), bytes.Equal(hash.Sum(nil), p.Hash()))