CRC32(3)

💅 CRC32(3) — like, the String::CRC32 situation

okay bestie, so this is the CRC32(3) page from the User Contributed Perl Documentation and it's genuinely so useful, you're gonna be obsessed 🫶

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✨ NAME ✨

String::CRC32 — a Perl interface for cyclic redundancy check generation 💖

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🌸 SYNOPSIS 🌸

use String::CRC32;

$crc = crc32("some string");
$crc = crc32("some string", initvalue);

$somestring = "some string";
$crc = crc32($somestring);
printf "%08x\n", $crc;

open my $fh, '<', 'location/of/some.file' or die $!;
binmode $fh;
$crc = crc32($fh);
close $fh;

like, that's it, that's the whole vibe check 💀✨

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🦋 DESCRIPTION 🦋

So the CRC32 module calculates CRC sums of 32 bit lengths as integers. No cap, it generates the same CRC values as ZMODEM, PKZIP, PICCHECK and, like, many others too 👑

And despite its name — plot twist 🎀 — this module is literally able to compute the checksum of files as well as strings. Both. It's giving versatility, honestly.

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🍓 EXAMPLES 🍓

okay so watch this:

$crc = crc32("some string");

results in the same thing as:

$crc = crc32(" string", crc32("some"));

lowkey iconic, right?? This is useful for subsequent CRC checking of substrings 💅✨

And you may even check files:

open my $fh, '<', 'location/of/some.file' or die $!;
binmode $fh;
$crc = crc32($fh);
close $fh;

ngl an init value may also have been supplied in the above example 👀 fr fr.

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🎀 AUTHOR 🎀

Soenke J. Peters <peters__perl@opcenter.de>

Current maintainer: LEEJO

Address bug reports and comments to: <https://github.com/leejo/string-crc32/issues> — like, pls do, they wanna hear from u 🫶

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💜 LICENSE 💜

CRC algorithm code taken from CRC-32 by Craig Bruce. The module stuff is inspired by a similar perl module called String::CRC by David Sharnoff & Matthew Dillon. Horst Fickenscher told me that it could be useful to supply an init value to the crc checking function and so I included this possibility 💖

The author of this package disclaims all copyrights and releases it into the public domain. periodt. 🎀👑

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cute sign-off time ✨ this lil masterpiece is from perl v5.42.0, dated 2021-02-05, and it lives at CRC32(3) forever and ever 🦋💖 slay.