Python-like "pack" and "unpack" in Javascript

Asked Mar 26 '21 at 09:44

Active Mar 26 '21 at 09:47

Viewed 266 times

I have to decode a message received in this form b'\r\x01\x00\x00\x00' from a device. The only way to do this is to convert a Python function to Javascript, I've tried to do this but the unpacking operation doesn't work like in Python, obviously.

This is the python code:

def DecodeData(self, data):
    try:
        n = struct.unpack('b',bytes(data[0:1]))[0]
        print(n)
        id , type, m = self._DecodeId(n)
        value = struct.unpack(type, bytes(data[1:]))[0]/m
        return (id, value)
    except Exception as e:
        print(e)
        pass

I have to run the Javascript code in Datacake Payload-Decoder section and the result should be ('CIN_3', 1.0), or something like that.

Hope anyone can help me.

edited Mar 26 '21 at 09:47

zhulien

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asked Mar 26 '21 at 09:44

ale-sant

Have you checked this? https://stackoverflow.com/questions/37892053/how-to-unpack-binary-in-javascript – TechySharnav Mar 26 '21 at 09:48
Are you saying that a string "b'\r\x01\x00\x00\x00'" somehow translates to "('CIN_3', 1.0)"? Can you be *exact* about the input format? Does it start with a literal "b" and then a quote? – trincot Mar 26 '21 at 09:48
Yes, the message always starts with a b and then a quote. – ale-sant Mar 26 '21 at 09:56
@georg there is a way to do this in Javascript? – ale-sant Mar 26 '21 at 10:31
sure, https://stackoverflow.com/questions/5605108/pack-unpack-functions-for-node-js – georg Mar 26 '21 at 11:33

Python-like "pack" and "unpack" in Javascript

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