9 "github.com/anacrolix/missinggo"
10 "github.com/edsrzf/mmap-go"
12 "github.com/anacrolix/torrent/metainfo"
13 "github.com/anacrolix/torrent/mmap_span"
16 type mmapStorage struct {
20 func NewMMap(baseDir string) I {
26 func (me *mmapStorage) OpenTorrent(info *metainfo.InfoEx) (t Torrent, err error) {
27 span, err := MMapTorrent(&info.Info, me.baseDir)
28 t = &mmapTorrentStorage{
34 type mmapTorrentStorage struct {
35 span mmap_span.MMapSpan
36 completed map[metainfo.Hash]bool
39 func (me *mmapTorrentStorage) Piece(p metainfo.Piece) Piece {
40 return mmapStoragePiece{
43 ReaderAt: io.NewSectionReader(me.span, p.Offset(), p.Length()),
44 WriterAt: missinggo.NewSectionWriter(me.span, p.Offset(), p.Length()),
48 func (me *mmapTorrentStorage) Close() error {
53 type mmapStoragePiece struct {
54 storage *mmapTorrentStorage
60 func (me mmapStoragePiece) GetIsComplete() bool {
61 return me.storage.completed[me.p.Hash()]
64 func (me mmapStoragePiece) MarkComplete() error {
65 if me.storage.completed == nil {
66 me.storage.completed = make(map[metainfo.Hash]bool)
68 me.storage.completed[me.p.Hash()] = true
72 func MMapTorrent(md *metainfo.Info, location string) (mms mmap_span.MMapSpan, err error) {
78 for _, miFile := range md.UpvertedFiles() {
79 fileName := filepath.Join(append([]string{location, md.Name}, miFile.Path...)...)
80 err = os.MkdirAll(filepath.Dir(fileName), 0777)
82 err = fmt.Errorf("error creating data directory %q: %s", filepath.Dir(fileName), err)
86 file, err = os.OpenFile(fileName, os.O_CREATE|os.O_RDWR, 0666)
97 if fi.Size() < miFile.Length {
98 err = file.Truncate(miFile.Length)
103 if miFile.Length == 0 {
104 // Can't mmap() regions with length 0.
108 mMap, err = mmap.MapRegion(file,
109 int(miFile.Length), // Probably not great on <64 bit systems.
112 err = fmt.Errorf("error mapping file %q, length %d: %s", file.Name(), miFile.Length, err)
115 if int64(len(mMap)) != miFile.Length {
116 panic("mmap has wrong length")