creating a torrent file in java

[krish arya]

Hi.
Can anyone tell me how to create a torrent file in java .
I do not want to use the existing api's like those provided by azuerus.
I just need to develop it from the scratch.
Please help as i need to develop the whole torrent client but first of all i need to learn the basics i.e creating a torrent file.

[Henry Wong]

Did a quick google, and found the specification....

http://wiki.theory.org/BitTorrentSpecification

The format is describe under meta file structure (section 7).

It actually looks interesting. Might worth a quick read. One of my previous companies worked on a peer to peer mechanism the used the Chord protocol, and I always wondered if the torrent DHT were similar.

Henry

[krish arya]

There is a section in the specification a\c to which the sha1 hash value of the piece needs to be in raw binary encoded form.
I m confused coz the sha1 hash are itself in the form of characters so how to do the raw binary encoding....
Please help....

[Rob Spoor]

krish arya wrote:I m confused coz

Please UseRealWords: "I am confused because".

[Henry Wong]

krish arya wrote:There is a section in the specification a\c to which the sha1 hash value of the piece needs to be in raw binary encoded form.
I m confused coz the sha1 hash are itself in the form of characters so how to do the raw binary encoding....

Actually, sha1 encoding yields binary data... it is just that most of the time, the binary data is further encoded, with either uuencoding or base64, so that it can stored in a properties or xml file.

If the torrent file requires sha1 as binary data, that should make it easier for you -- no need to do the extra steps of encoding to text, and decoding from text.

Henry