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51 lines
1.7 KiB
Markdown
51 lines
1.7 KiB
Markdown
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See also: [[Using Python on macOS]].
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We will use a very simple Python script to validate encodings. You can find the script here: https://gist.github.com/marcinczenko/a87baf506bb0fd4bdff752cda4c685a1
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Our input will be the following `data1M.bin.torrent.json` file:
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```nim
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{
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"info": {
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"length": 1048576,
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"name": "data1M.bin",
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"piece length": 262144,
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"pieces": [
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"111421FEBA308CD51E9ACF88417193A9EA60F0F84646",
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"11143D4A8279853DA2DA355A574740217D446506E8EB",
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"11141AD686B48B9560B15B8843FD00E7EC1B59624B09",
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"11145015E7DA0C40350624C6B5A1FED1DB39720B726C"
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]
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}
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}
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```
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To *b-encode* we run:
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```bash
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python bencoder.py --info-only data1M.bin.torrent.json
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Using values from file: data1M.bin.torrent.json
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Info only: True
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{
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"length": 1048576,
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"name": "data1M.bin",
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"piece length": 262144,
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"pieces": [
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"21FEBA308CD51E9ACF88417193A9EA60F0F84646",
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"3D4A8279853DA2DA355A574740217D446506E8EB",
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"1AD686B48B9560B15B8843FD00E7EC1B59624B09",
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"5015E7DA0C40350624C6B5A1FED1DB39720B726C"
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]
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}
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infohash f335440998515770adf47e8a4626889e59d91dde
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```
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The `--info-only` option instructs the script to only b-encode the info dictionary and do not include other attributes like `announce`.
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We get as an output the `data1M.bin.torrent` file with the following content:
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```bash
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d4:infod6:lengthi1048576e4:name10:data1M.bin12:piece lengthi262144e6:pieces80:!<21><>0<EFBFBD><30> <1E>ψAq<41><71><EFBFBD>`<60><>FF=J<>y<EFBFBD>=<3D><>5ZWG@!}De<06><>ֆ<><D686><EFBFBD>`<EFBFBD>[<5B>C<EFBFBD> <00><>YbK P<15><> @5$Ƶ<><C6B5><EFBFBD><EFBFBD>9r rlee
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```
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It is not very readable, because pieces has been converted to hex strings to a flattened byte array - in the end this is supposed to be machine readable code.
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