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For memory constrained enviroments and network protocols being able to use memory without extra copies is a benefit. E.g. in my ZMODEM2 crate I need to do this for hex messages:
It is good example since the protocol frames can come also in binary format in addition to hex. It would be nice to do this preprocessing within the same buffer as where the data landed to make a transparent zerocopy flow.
Link: https://github.com/jarkkojs/zmodem2/