

Task

Demonstrate a method of deriving the Cyclic Redundancy Check from within the language.



The result should be in accordance with ISO 3309, ITU-T V.42, Gzip and PNG.

Algorithms are described on Computation of CRC in Wikipedia.
This variant of CRC-32 uses LSB-first order, sets the initial CRC to FFFFFFFF16, and complements the final CRC.

For the purpose of this task, generate a CRC-32 checksum for the ASCII encoded string:

 The quick brown fox jumps over the lazy dog


use NativeCall;
 
sub crc32(int32 $crc, Buf $buf, int32 $len --> int32) is native('z') { * }
 
my $buf = 'The quick brown fox jumps over the lazy dog'.encode;
say crc32(0, $buf, $buf.bytes).fmt('%08x');