org.klomp.snark
Class MetaInfo

java.lang.Object
  org.klomp.snark.MetaInfo

public class MetaInfo
extends Object

Note: this class is buggy, as it doesn't propogate custom meta fields into the bencoded info data, and from there to the info_hash. At the moment, though, it seems to work with torrents created by I2P-BT, I2PRufus and Azureus.

Constructor Summary

MetaInfo(InputStream in)
Creates a new MetaInfo from the given InputStream.

MetaInfo(Map<String,BEValue> m)
Creates a new MetaInfo from a Map of BEValues and the SHA1 over the original bencoded info dictonary (this is a hack, we could reconstruct the bencoded stream and recalculate the hash).

MetaInfo(String announce, String name, String name_utf8, List<List<String>> files, List<Long> lengths, int piece_length, byte[] piece_hashes, long length, boolean privateTorrent)
Called by Storage when creating a new torrent from local data

Method Summary

boolean	checkPiece(int piece, byte[] bs, int off, int length) Checks that the given piece has the same SHA1 hash as the given byte array.
(package private) boolean	checkPiece(PartialPiece pp)
String	getAnnounce() Returns the string representing the URL of the tracker for this torrent.
List<List<String>>	getFiles() Returns a list of lists of file name hierarchies or null if it is a single name.
byte[]	getInfoBytes()
byte[]	getInfoHash() Returns the original 20 byte SHA1 hash over the bencoded info map.
List<Long>	getLengths() Returns a list of Longs indication the size of the individual files, or null if it is a single file.
String	getName() Returns the requested name for the file or toplevel directory.
static String	getNameAndInfoHash(InputStream in, byte[] infoHashOut) Efficiently returns the name and the 20 byte SHA1 hash of the info dictionary in a torrent file Caller must close stream.
(package private) byte[]	getPieceHashes() Returns the piece hashes.
int	getPieceLength(int piece) Return the length of a piece.
int	getPieces() Returns the number of pieces.
byte[]	getTorrentData() Called by servlet to save a new torrent file generated from local data
long	getTotalLength() Returns the total length of the torrent in bytes.
boolean	isPrivate() Is it a private torrent?
static void	main(String[] args)
MetaInfo	reannounce(String announce) Creates a copy of this MetaInfo that shares everything except the announce URL.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MetaInfo

MetaInfo(String announce,
         String name,
         String name_utf8,
         List<List<String>> files,
         List<Long> lengths,
         int piece_length,
         byte[] piece_hashes,
         long length,
         boolean privateTorrent)

Called by Storage when creating a new torrent from local data

Parameters:

announce - may be null

files - null for single-file torrent

lengths - null for single-file torrent

MetaInfo

public MetaInfo(InputStream in)
         throws IOException

Creates a new MetaInfo from the given InputStream. The InputStream must start with a correctly bencoded dictonary describing the torrent. Caller must close the stream.

Throws:

IOException

MetaInfo

public MetaInfo(Map<String,BEValue> m)
         throws InvalidBEncodingException

Creates a new MetaInfo from a Map of BEValues and the SHA1 over the original bencoded info dictonary (this is a hack, we could reconstruct the bencoded stream and recalculate the hash). Will NOT throw a InvalidBEncodingException if the given map does not contain a valid announce string. WILL throw a InvalidBEncodingException if the given map does not contain a valid info dictionary.

Throws:

InvalidBEncodingException

Method Detail

getNameAndInfoHash

public static String getNameAndInfoHash(InputStream in,
                                        byte[] infoHashOut)
                                 throws IOException

Efficiently returns the name and the 20 byte SHA1 hash of the info dictionary in a torrent file Caller must close stream.

Parameters:

infoHashOut - 20-byte out parameter

Throws:

IOException

Since:

0.8.5

getAnnounce

public String getAnnounce()

Returns the string representing the URL of the tracker for this torrent.

Returns:

may be null!

getInfoHash

public byte[] getInfoHash()

Returns the original 20 byte SHA1 hash over the bencoded info map.

getPieceHashes

byte[] getPieceHashes()

Returns the piece hashes. Only used by storage so package local.

getName

public String getName()

Returns the requested name for the file or toplevel directory. If it is a toplevel directory name getFiles() will return a non-null List of file name hierarchy name.

isPrivate

public boolean isPrivate()

Is it a private torrent?

Since:

0.9

getFiles

public List<List<String>> getFiles()

Returns a list of lists of file name hierarchies or null if it is a single name. It has the same size as the list returned by getLengths().

getLengths

public List<Long> getLengths()

Returns a list of Longs indication the size of the individual files, or null if it is a single file. It has the same size as the list returned by getFiles().

getPieces

public int getPieces()

Returns the number of pieces.

getPieceLength

public int getPieceLength(int piece)

Return the length of a piece. All pieces are of equal length except for the last one (getPieces()-1).

Throws:

IndexOutOfBoundsException - when piece is equal to or greater then the number of pieces in the torrent.

checkPiece

public boolean checkPiece(int piece,
                          byte[] bs,
                          int off,
                          int length)

Checks that the given piece has the same SHA1 hash as the given byte array. Returns random results or IndexOutOfBoundsExceptions when the piece number is unknown.

checkPiece

boolean checkPiece(PartialPiece pp)

Returns:

good

Since:

0.9.1

getTotalLength

public long getTotalLength()

Returns the total length of the torrent in bytes.

toString

public String toString()

Overrides:

toString in class Object

reannounce

public MetaInfo reannounce(String announce)

Creates a copy of this MetaInfo that shares everything except the announce URL.

getTorrentData

public byte[] getTorrentData()

Called by servlet to save a new torrent file generated from local data

getInfoBytes

public byte[] getInfoBytes()

Since:

0.8.4

main

public static void main(String[] args)

Since:

0.8.5