![]() If the file starts at exactly a piece offset, and is sized equal to a multiple of the piece size or is the last file in the torrent then you can reuse these hashes. Piece length is fixed for a torrent, typically between 256KB and 1MB. torrent file contains a very long string, each 20 bytes representing the hash of each piece in the torrent. torrent, you then need to get the hashes relating to the file you're interested in. Any bittorrent library that supports magnet URIs has the code for that task. ![]() ![]() torrent file, so if you only have a magnet URI you need to resolve that to a. Sometimes yes, but not often, and the resulting swarm has no peers.įirstly, you need the original. BEP 53: "Magnet URI extension - Select specific file indices for download"Įxample URI to request files 0, 2, 4 and the inclusive range 6 through to 8: magnet:?xt=urn:btih:HASH&dn=NAME&tr=TRACKER&so=0,2,4,6-8Īnd the draft BEP is making it's way into bittorrent libraries: They will share a swarm, which means you can, as the question asks " an almost new torrent/magnet link to download only that single file but using the same source". 2019 Update: Yes, you now can! In 2017 a draft BEP was released that covers the question's behaviour for magnet URIs! This is great, as it creates a standard that keeps a consistent info_hash between a magnet URI pointing to the multi-file torrent, and a magnet URI pointing to a single file within that multi-file torrent.
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