

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


#include <stdio.h>
#include <string.h>
#include <zlib.h>
 
int main()
{
	const char *s = "The quick brown fox jumps over the lazy dog";
	printf("%lX\n", crc32(0, (const void*)s, strlen(s)));
 
	return 0;
}