BT seed file format

BT seed file format

The BT seed file uses a bencoding encoding method to save data.
There are four types of bencoding data: srings (string), integers (integer), lists (list), dictionaries (dictionary)
The encoding rules are as follows:
Strings (string) encoding: <String Length >:< string>
For example, 4: test indicates the string "test"
4: The example is the string "example"
String Length in bytes
No start or end mark

Integers (integer) is encoded as: I <integer> E
Start to mark I, end to Mark E
For example, i1234e indicates an integer of 1234.
I-1234e represents an integer-1234
No integer size limit
I0e is an integer of 0.
Illegal i-0e
The value starting with 0 is invalid. For example, the value of i01234e is invalid.

Lists (list) encoding: L <bencoding encoding type> E
Start to L, end to E
The list can contain any bencoding encoding type, including integers, strings, lists, and dictionaries.
For example, L4: test5abcdee represents two strings ["test", "ABCDE"]

Dictionaries (dictionary) is encoded as D <bencoding string> <bencoding encoding type> E
Mark start as D and end as E
The keyword must be a bencoding string.
The value can be of any bencoding encoding type.
For example, D3: agei20ee indicates {"Age" = 20}
D4: path3: C:/8: filename8: test.txt E: {"path" = "C:/", "FILENAME" = "test.txt "}

The file structure is as follows:
All content must be of the bencoding encoding type.
The entire file is a dictionary structure that contains the following keywords:
Announce: the URL of the tracker server (string)
Announce-List (optional): List of backup tracker servers (list)
Creation date (optional): Specifies the seed creation time. It is a UNIX standard time format. The number of seconds from 00:00:00, January 1, 1970 to the creation time (integer)
Comment (optional): Remarks (string)
Created by (optional): Information of the creator or program (string)
Info: a dictionary structure that contains the main information of a file. There are two types of information: single file structure or multi-file structure.
The structure of a single file is as follows:
Length: file length, in bytes (integer)
Md5sum (optional): MD5 checksum of a 32-character file. BT does not use this value, but it is reserved for compatibility with some programs! (String)
Name: File Name (string)
Piece length: the size of each block, in bytes (integer)
Pieces: The sha1 hash value of 20 bytes for each block (in binary format)
The structure of multiple files is as follows:
Files: a dictionary structure
Length: file length, in bytes (integer)
Md5sum (optional): same as that in the single file structure
Path: the file path and name. It is a list structure. For example, the/test/test.txt list is L4: test8test.txt E.
Name: the name of the top-level directory (string)
Piece length: same as in a single file structure
Pieces: same as in the single file structure
Instance:
Use NotePad to open a. torrent file.
D8: announce35: http://www.manfen.net: 7802/announce13: Creation datei000066750000e4: infod6: lengthi17799e4: name62: MICROSOFT.WINDOWS.2000.AND.NT4.SOURCE.CODE-SCENELEADER. tor000012: piece lengthi32768e6: pieces20 :? W? Why? Snapshot row T snapshot EE

It is easy to see
Announce = http://www.manfen.net: 7802/announce
Creation date = 1076675108 seconds (02/13/04 20:25:08)
File name = MICROSOFT.WINDOWS.2000.AND.NT4.SOURCE.CODE-SCENELEADER. torrent
File size = 17799 bytes
File block size = 32768 bytes