announce: The announce URL of the tracker (string).There are two possible forms: one for the case of a 'single-file' torrent with no directory structure, and one for the case of a 'multi-file' torrent (see below for details) info: a dictionary that describes the file(s) of the torrent.All character string values are UTF-8 encoded. The content of a metainfo file (the file ending in ".torrent") is a bencoded dictionary, containing the keys listed below. The specification for bencoding is defined above. ![]() Decoding encoding bencoded data with haskell by EdiĪll data in a metainfo file is bencoded.The strings should be compared using a binary comparison, not a culture-specific "natural" comparison.Įxample: d3:cow3:moo4:spam4:eggs e represents the dictionary Implementations ![]() Keys must be strings and appear in sorted order (sorted as raw strings, not alphanumerics). The values may be any bencoded type, including integers, strings, lists, and other dictionaries. Note that the keys must be bencoded strings. The initial d and trailing e are the beginning and ending delimiters. Lists may contain any bencoded type, including integers, strings, dictionaries, and even lists within other lists.Įxample: l4:spam4:eggs e represents the list of two strings: Įxample: le represents an empty list: Dictionaries The initial l and trailing e are beginning and ending delimiters. NOTE: The maximum number of bit of this integer is unspecified, but to handle it as a signed 64bit integer is mandatory to handle "large files" aka.All encodings with a leading zero, such as i03 e, are invalid, other than i0 e, which of course corresponds to the integer "0". The initial i and trailing e are beginning and ending delimiters.Įxample: i3 e represents the integer "3" Example: i-3 e represents the integer "-3" Note that there is no constant beginning delimiter, and no ending delimiter.Įxample: 4: spam represents the string "spam"Įxample: 0: represents the empty string "" Integers It supports the following types: byte strings, integers, lists, and dictionaries. one-line) entry for each major change that you've made to the document.īencoding is a way to specify and organize data in a terse format. In order to help others find recent changes that have been made to this document, please fill out the Summary: field when you do a edit. defacto standard: Large blocks of text in italics indicates a practice so common in various client implementations of BitTorrent that it is considered a defacto standard.Two or more blocks make up a whole piece, which may then be verified. A block is a portion of data that a client may request from a peer. piece v/s block: In this document, a piece refers to a portion of the downloaded data that is described in the metainfo file, which can be verified by a SHA1 hash.Readers of this specification may choose to think of themselves as the client which connects to numerous peers. The client is also a peer, however it is the BitTorrent client that is running on the local machine. peer v/s client: In this document, a peer is any BitTorrent client participating in a download.In this document, a number of conventions are used in an attempt to present information in a concise and unambiguous fashion. As newer revisions of each protocol are defined, they should be specified on their own separate pages, not here. Currently, this applies to the torrent file structure, peer wire protocol, and the Tracker HTTP/HTTPS protocol specifications. version 1.0) of the BitTorrent protocol specification. ![]() This document applies to the first version (i.e. This is not the place to suggest feature requests. Everyone is invited to contribute to this document, with the understanding that the content here is intended to represent the current protocol, which is already deployed in a number of existing client implementations. ![]() This document is intended to be maintained and used by the BitTorrent development community. The hope is that this document will become a formal specification, written in clear, unambiguous terms, which can be used as a basis for discussion and implementation in the future. Bram's protocol specification page outlines the protocol in somewhat general terms, and lacks behaviorial detail in some areas. The purpose of this specification is to document version 1.0 of the BitTorrent protocol specification in detail. Visit his pages at BitTorrent is designed to facilitate file transfers among multiple peers across unreliable networks.
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