String::CRC32
Simple Perl 6 class to calculate a CRC32 checksum of a string
NAME
String::CRC32 - Calculate 32-bit CRC checksum of strings
SYNOPSIS
use v6;
use String::CRC32;
# CRC of a string
my $string = 'Hello, world';
my $crc32 = String::CRC32::crc32($string);
# CRC of a filehandle
my $fh = open("myfile", :r);
$crc32 = String::CRC32::crc32($fh);
$fh.close();
DESCRIPTION
The CRC32 module calculates CRC sums of 32 bit lenghts. It generates the same CRC values as ZMODEM, PKZIP, PICCHECK and many others.
METHODS
crc32($string)
Calculates and returns a CRC32 checksum of a string. For an example, see the SYNOPSIS.
Example:
use v6;
use String::CRC32;
my $string = 'Hello, world';
say String::CRC32::crc32($string);
# prints '3885672898'
crc32($fh)
Reads the whole file and calculates the CRC of that file.
Example:
use v6;
use String::CRC32;
my $fh = open("myfile.txt", :r);
say String::CRC32::crc32($fh);
$fh.close();
AUTHOR
Cosimo Streppone, <[email protected]>
Most bits shamelessly stolen from String::CRC32 for Perl 5, version 1.4 by Sönke J. Peters.
COPYRIGHT
I hereby include the COPYRIGHT section for Perl5 String::CRC32:
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.