medium-clone | rigorous exploration of REST architecture

by the-vampiire JavaScript Version: Current License: No License

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kandi X-RAY | medium-clone Summary

medium-clone is a JavaScript library. medium-clone has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

A rigorous exploration of REST architecture modeling the Medium.com API in NodeJS. Minimal libs, no codegen and 99% coverage

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medium-clone has a low active ecosystem.

It has 4 star(s) with 1 fork(s). There are no watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 1 have been closed. There are 14 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of medium-clone is current.

Quality

medium-clone has no bugs reported.

Security

medium-clone has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

medium-clone does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

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medium-clone releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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medium-clone Key Features

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medium-clone Examples and Code Snippets

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Community Discussions

Trending Discussions on medium-clone

How to check CRC16 validity

QUESTION

How to check CRC16 validity

Asked 2020-Jul-26 at 19:33

I'm working on receiving binary data from sensors for the first time. The data is base64-encoded, I should decode the data and validate it and then save it to the database. One step of the validation process is to check for the CRC-16 validity.

Each payload I receive comes with a CRC code, I have the function that is supposed to calculate the CRC-16 code itself, all I want to know is if it's enough to check that by passing the decoded data to the CRC-16 calculation function and then comparing the result to zero? If it's non-zero, then the data has been corrupted.

If everything went fine, I need unpack the binary data and loop over the result to get the sensors' data such as the battery and air_temperature according to specific offset info (according to the manufacturer's documentation). Then save the data as we normally do to the DB.

The problem is: I get non-zero values when I apply the crc16Calc function to a valid dataset.

Can that be because the CRC is added to the beginning of the data string, not to the end? I mean the structure of the payload is , not the opposite!

My code is:

...

ANSWER

Answered 2020-Jul-26 at 15:53

Just save the first two bytes, calculate the CRC on the rest, and then compare that to what you saved. That's far and away the most straightforward and most verifiable approach. Not to mention it is a smidge faster than what you want to do (even if you could), since you avoid calculating the CRC on two bytes that you don't need to.

You will get a zero on the whole thing only if the sender appended the CRC bytes to the end, and they appended them in little-endian order.

If you simply cannot resist the siren's call of that lovely algebraic property of the CRC, then move the two bytes to the end, in the proper byte order, and compute the CRC on the message plus CRC. The result should be zero.

Update for example data added to question:

The first two bytes of each 47-byte message is the expected CRC-16/ARC, stored in little-endian order. The approaches given above work as stated, using the 45 bytes after the CRC as the data. The PHP CRC code is correct.

Source https://stackoverflow.com/questions/63093077

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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