this post was submitted on 04 Aug 2024
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37
command line util to encode/decode framed packets? (lemmy.world)
submitted 3 months ago by [email protected] to c/[email protected]
15 comments fedilink hide all child comments
 

I'm currently trying to set up a homebrew cassette tape storage format, but trying to use existing tech where possible. I was excited to see that minimodem already exists for converting an audio stream to a byte stream, and is even available in termux for android, so I could decode cassettes with my phone! However, I'd like some sort of higher-level tool to encode and decode "packets" or "slices" so that I can add error correction. I'm sure this sort of thing must exist for amature radio purposes.

I could write a script that cuts a file into slices, with checksums and redundancy for each slice, and then pads them with null bytes so I can isolate each frame when decoding. What I want is to find out if that's already been done. I've heard of AX.25 packets but I can't find a tool that does that with stdio.

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[–] [email protected] 10 points 3 months ago (1 children)

Holy f… I thought you’re joking but yes tar is indeed a tape archiver

https://www.tecmint.com/tar-command-examples-linux/

[–] [email protected] 8 points 3 months ago* (last edited 3 months ago)

That is what tar stands for. Interestingly enough, tar is based on an older util called ar, which was just a generic archive.