metainfo

package
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 Go to latest Published: Oct 10, 2023 License: MPL-2.0 Imports: 17 Imported by: 3,543

README 

A library for manipulating ".torrent" files.

Documentation

Index

Constants

View Source 
const HashSize = infohash.Size
View Source 
const NoName = "-"

The Info.Name field is "advisory". For multi-file torrents it's usually a suggested directory name. There are situations where we don't want a directory (like using the contents of a torrent as the immediate contents of a directory), or the name is invalid. Transmission will inject the name of the torrent file if it doesn't like the name, resulting in a different infohash (https://github.com/transmission/transmission/issues/1775). To work around these situations, we will use a sentinel name for compatibility with Transmission and to signal to our own client that we intended to have no directory name. By exposing it in the API we can check for references to this behaviour within this implementation.

Variables

View Source 
var (
	NewHashFromHex = infohash.FromHexString
	HashBytes      = infohash.HashBytes
)
View Source 
var ParseMagnetURI = ParseMagnetUri

Deprecated: Use ParseMagnetUri.

Functions

func ChoosePieceLength added in v1.47.0 

func ChoosePieceLength(totalLength int64) (pieceLength int64)

Choose a good piecelength.

func GeneratePieces added in v1.16.0 

func GeneratePieces(r io.Reader, pieceLength int64, b []byte) ([]byte, error)

Types

type AnnounceList 

type AnnounceList [][]string

func (AnnounceList) Clone added in v1.16.0 

func (al AnnounceList) Clone() (ret AnnounceList)

func (AnnounceList) DistinctValues 

func (al AnnounceList) DistinctValues() (ret []string)

func (AnnounceList) OverridesAnnounce 

func (al AnnounceList) OverridesAnnounce(announce string) bool

Whether the AnnounceList should be preferred over a single URL announce.

type FileInfo 

type FileInfo struct {
	Length   int64    `bencode:"length"` // BEP3
	Path     []string `bencode:"path"`   // BEP3
	PathUtf8 []string `bencode:"path.utf-8,omitempty"`
}

Information specific to a single file inside the MetaInfo structure.

func (FileInfo) BestPath added in v1.42.0 

func (fi FileInfo) BestPath() []string

func (*FileInfo) DisplayPath 

func (fi *FileInfo) DisplayPath(info *Info) string

func (FileInfo) Offset 

func (me FileInfo) Offset(info *Info) (ret int64)

type Hash 

type Hash = infohash.T

type Info 

type Info struct {
	PieceLength int64  `bencode:"piece length"` // BEP3
	Pieces      []byte `bencode:"pieces"`       // BEP3
	Name        string `bencode:"name"`         // BEP3
	NameUtf8    string `bencode:"name.utf-8,omitempty"`
	Length      int64  `bencode:"length,omitempty"`  // BEP3, mutually exclusive with Files
	Private     *bool  `bencode:"private,omitempty"` // BEP27
	// TODO: Document this field.
	Source string     `bencode:"source,omitempty"`
	Files  []FileInfo `bencode:"files,omitempty"` // BEP3, mutually exclusive with Length
}

The info dictionary.

func (Info) BestName added in v1.42.0 

func (info Info) BestName() string

func (*Info) BuildFromFilePath 

func (info *Info) BuildFromFilePath(root string) (err error)

This is a helper that sets Files and Pieces from a root path and its children.

func (*Info) GeneratePieces 

func (info *Info) GeneratePieces(open func(fi FileInfo) (io.ReadCloser, error)) (err error)

Sets Pieces (the block of piece hashes in the Info) by using the passed function to get at the torrent data.

func (*Info) IsDir 

func (info *Info) IsDir() bool

func (*Info) NumPieces 

func (info *Info) NumPieces() int

func (*Info) Piece 

func (info *Info) Piece(index int) Piece

func (*Info) TotalLength 

func (info *Info) TotalLength() (ret int64)

func (*Info) UpvertedFiles 

func (info *Info) UpvertedFiles() []FileInfo

The files field, converted up from the old single-file in the parent info dict if necessary. This is a helper to avoid having to conditionally handle single and multi-file torrent infos.

type Magnet 

type Magnet struct {
	InfoHash    Hash       // Expected in this implementation
	Trackers    []string   // "tr" values
	DisplayName string     // "dn" value, if not empty
	Params      url.Values // All other values, such as "x.pe", "as", "xs" etc.
}

Magnet link components.

func ParseMagnetUri added in v1.19.0 

func ParseMagnetUri(uri string) (m Magnet, err error)

ParseMagnetUri parses Magnet-formatted URIs into a Magnet instance

func (Magnet) String 

func (m Magnet) String() string

type MetaInfo 

type MetaInfo struct {
	InfoBytes    bencode.Bytes `bencode:"info,omitempty"`                              // BEP 3
	Announce     string        `bencode:"announce,omitempty"`                          // BEP 3
	AnnounceList AnnounceList  `bencode:"announce-list,omitempty"`                     // BEP 12
	Nodes        []Node        `bencode:"nodes,omitempty,ignore_unmarshal_type_error"` // BEP 5
	// Where's this specified? Mentioned at
	// https://wiki.theory.org/index.php/BitTorrentSpecification: (optional) the creation time of
	// the torrent, in standard UNIX epoch format (integer, seconds since 1-Jan-1970 00:00:00 UTC)
	CreationDate int64   `bencode:"creation date,omitempty,ignore_unmarshal_type_error"`
	Comment      string  `bencode:"comment,omitempty"`
	CreatedBy    string  `bencode:"created by,omitempty"`
	Encoding     string  `bencode:"encoding,omitempty"`
	UrlList      UrlList `bencode:"url-list,omitempty"` // BEP 19 WebSeeds
}

func Load 

func Load(r io.Reader) (*MetaInfo, error)

Load a MetaInfo from an io.Reader. Returns a non-nil error in case of failure.

func LoadFromFile 

func LoadFromFile(filename string) (*MetaInfo, error)

Convenience function for loading a MetaInfo from a file.

func (MetaInfo) HashInfoBytes 

func (mi MetaInfo) HashInfoBytes() (infoHash Hash)

func (MetaInfo) Magnet 

func (mi MetaInfo) Magnet(infoHash *Hash, info *Info) (m Magnet)

Creates a Magnet from a MetaInfo. Optional infohash and parsed info can be provided.

func (*MetaInfo) SetDefaults 

func (mi *MetaInfo) SetDefaults()

Set good default values in preparation for creating a new MetaInfo file.

func (MetaInfo) UnmarshalInfo 

func (mi MetaInfo) UnmarshalInfo() (info Info, err error)

func (*MetaInfo) UpvertedAnnounceList 

func (mi *MetaInfo) UpvertedAnnounceList() AnnounceList

Returns the announce list converted from the old single announce field if necessary.

func (MetaInfo) Write 

func (mi MetaInfo) Write(w io.Writer) error

Encode to bencoded form.

type Node 

type Node string

func (*Node) UnmarshalBencode 

func (n *Node) UnmarshalBencode(b []byte) (err error)

type Piece 

type Piece struct {
	Info *Info // Can we embed the fields here instead, or is it something to do with saving memory?
	// contains filtered or unexported fields
}

func (Piece) Hash 

func (p Piece) Hash() (ret Hash)

func (Piece) Index 

func (p Piece) Index() pieceIndex

func (Piece) Length 

func (p Piece) Length() int64

func (Piece) Offset 

func (p Piece) Offset() int64

type PieceKey 

type PieceKey struct {
	InfoHash Hash
	Index    pieceIndex
}

Uniquely identifies a piece.

type UrlList 

type UrlList []string

func (*UrlList) UnmarshalBencode 

func (me *UrlList) UnmarshalBencode(b []byte) error

Source Files

View all Source files

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