BT seed file format

The BT seed file uses a coding method called Bencoding to hold the data.
Bencoding existing four types of data: Srings (String), integers (integer), lists (list), dictionaries (dictionary)
The encoding rules are as follows:
Strings (string) encoded as:< string length >:< string >
For example: 4:test is represented as the string "test"
4: Example Expression for string "example"
String length unit is byte
No start or end tag

Integers (integer) is encoded as a:i< integer >e
Start tag I, end tag for E
For example: i1234e is represented as an integer 1234
i-1234e represented as integer-1234
Integer has no size limit
I0E is represented as an integer 0
I-0E is illegal
With 0 The beginning of the illegality as: i01234e for illegal

Lists (list) is encoded as: l<bencoding encoding type >e
Start marked as l, end marked E
The list can contain any bencoding encoding type, including integers, strings, lists, dictionaries.
For example: L4:test5abcdee is represented as two strings ["Test", "ABCDE"]

Dictionaries (dictionary) is encoded as a d<bencoding string ><bencoding encoding type >e
Start marked D, end marked E
Keyword must be a bencoding string
Value can be of any bencoding encoding type
For example: D3:agei20ee is represented as {"Age" = 20}
D4:path3:c:\8:filename8:test.txte is represented as {"path" = "C:\", "filename" = "test.txt"}

The specific file structure of BT Seed is as follows:
All content must be of the bencoding encoding type.
The entire file is a dictionary structure that contains the following keywords

d8:announce: Tracker server URL (string)
announce-list (optional): Alternate tracker server list (list)
Creation Date (optional): Time of seed creation, UNIX standard time format, number of seconds from 1970 January 1 00:00:00 to Creation time (integer)
Comment (optional): note (string)
created by (optional): Information for creating a person or creating a program (String)
Info: A dictionary structure that contains the primary information for a file in two cases: Single file structure or multiple file structure
The single file structure is as follows:
Length: File length, Unit byte (integer)
md5sum (optional): Long 32 Characters of the file's MD5 checksum, BT does not use this value, just to be compatible with some programs reserved! String
Name: File name (string)
piece length: size of each block, Unit byte (integer)
pieces: value of SHA1 hash per block (binary format, 20 byte size)

The multi-file structure is as follows:

D
Files: A dictionary structure that includes the following 3
Length: File length, Unit byte (integer)
md5sum (optional): Same in single file structure
Path: File paths and names, is a list structure, such as \test\test.txt list for L4:test8test.txte

E
....

Name: top-Most directory name (string)
piece Length: The size of each block, same as in the single file structure
pieces: value of SHA1 hash per block (binary format, 20 byte size)

In any case, it ends with ee . The preceding e-match info dictionary structure, the last e-matching file head dictionary structure;

Instance:
Open one in Notepad. torrent can look something like the following
d8:announcehttp://www.manfen.net:7802/announce:creation Datei 1076675108e4:infod6:lengthi17799e4:name:MICROSOFT. Windows.2000.and.nt4.source.code-sceneleader.torrent:piece lengthi32768e6: Pieces:? W 躐 緕 T Feng ee

It's easy to see
Announce=http://www.manfen.net:7802/announce
Creation date=1076675108 seconds (02/13/04 20:25:08)
Name=microsoft. Windows.2000.and.nt4.source.code-sceneleader.torrent
length=17799 bytes
Piece length=32768 bytes