8 "github.com/anacrolix/libtorgo/bencode"
11 // Information specific to a single file inside the MetaInfo structure.
12 type FileInfo struct {
13 Length int64 `bencode:"length"`
14 Path []string `bencode:"path"`
17 // Load a MetaInfo from an io.Reader. Returns a non-nil error in case of
19 func Load(r io.Reader) (*MetaInfo, error) {
21 d := bencode.NewDecoder(r)
29 // Convenience function for loading a MetaInfo from a file.
30 func LoadFromFile(filename string) (*MetaInfo, error) {
31 f, err := os.Open(filename)
39 // The info dictionary.
41 PieceLength int64 `bencode:"piece length"`
42 Pieces []byte `bencode:"pieces"`
43 Name string `bencode:"name"`
44 Length int64 `bencode:"length,omitempty"`
45 Private bool `bencode:"private,omitempty"`
46 Files []FileInfo `bencode:"files,omitempty"`
49 func (i *Info) IsDir() bool {
50 return len(i.Files) != 0
53 // The files field, converted up from the old single-file in the parent info
54 // dict if necessary. This is a helper to avoid having to conditionally handle
55 // single and multi-file torrent infos.
56 func (i *Info) UpvertedFiles() []FileInfo {
57 if len(i.Files) == 0 {
60 // Callers should determine that Info.Name is the basename, and
61 // thus a regular file.
68 // The info dictionary with its hash and raw bytes exposed, as these are
69 // important to Bittorrent.
77 _ bencode.Marshaler = InfoEx{}
78 _ bencode.Unmarshaler = &InfoEx{}
81 func (this *InfoEx) UnmarshalBencode(data []byte) error {
82 this.Bytes = make([]byte, 0, len(data))
83 this.Bytes = append(this.Bytes, data...)
85 _, err := h.Write(this.Bytes)
89 this.Hash = h.Sum(nil)
90 return bencode.Unmarshal(data, &this.Info)
93 func (this InfoEx) MarshalBencode() ([]byte, error) {
94 if this.Bytes != nil {
95 return this.Bytes, nil
97 return bencode.Marshal(&this.Info)
100 type MetaInfo struct {
101 Info InfoEx `bencode:"info"`
102 Announce string `bencode:"announce"`
103 AnnounceList [][]string `bencode:"announce-list,omitempty"`
104 CreationDate int64 `bencode:"creation date,omitempty"`
105 Comment string `bencode:"comment,omitempty"`
106 CreatedBy string `bencode:"created by,omitempty"`
107 Encoding string `bencode:"encoding,omitempty"`
108 URLList interface{} `bencode:"url-list,omitempty"`