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What is a working CRC?

I searched and can not find information about what it is and how it is calculated.

I have no idea why there was a negative question. Isn't that understandable and related to programming? Or I should have asked:

# Or you can compute the running CRC: $crc = 0; $crc = Archive::Zip::computeCRC32( 'abcdef', $crc ); $crc = Archive::Zip::computeCRC32( 'ghijkl', $crc );

What exactly is going on here?

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Well, basically it's just CRC . The word “running” means that you must calculate it “on the fly”, because the data is coming in, or that you are doing a cumulative calculation (this is how CRC is implemented).

You have a good example:

  # Or you can compute the running CRC: $crc = 0; $crc = Archive::Zip::computeCRC32( 'abcdef', $crc ); $crc = Archive::Zip::computeCRC32( 'ghijkl', $crc );

Note that the variable $crc set to 0 at the beginning and updated twice . The CRC calculation algorithm uses the previously calculated CRC value and update . That's why it is sometimes called running CRC.

From your code, I assume that you already have an implementation, if not, just Google for CRC32.

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Source: https://habr.com/ru/post/1285899/

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