Initial v0.01 version. Status=working!

README

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+Perl6 String::CRC32
+===================
+
+http://github.com/cosimo/perl6-string-crc32/
+
+Pure Perl6 version of String::CRC32 from Perl5.
+Based on CPAN version 1.4 by Sönke J. Peters.
+
+Current status (2010/08/02)
+===========================
+
+Needed for Cache::Memcached.
+Works fine, maybe slower than the Perl5 XS :)
+

lib/String/CRC32.pm

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+# Adapted from Perl5 String::CRC32 CRC32.xs
+# http://search.cpan.org/dist/String-CRC32/
+
+use v6;
+
+class String::CRC32:auth<cosimo>:ver<0.01>;
+
+my @CRC_TABLE =
+0x0, 0x77073096, 0xee0e612c, 0x990951ba, 0x76dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+0xedb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x9b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+0x76dc4190, 0x1db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x6b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+0x7807c9a2, 0xf00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x86d3d2d, 0x91646c97, 0xe6635c01,
+0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+0xedb88320, 0x9abfb3b6, 0x3b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x4db2615, 0x73dc1683,
+0xe3630b12, 0x94643b84, 0xd6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0xa00ae27, 0x7d079eb1,
+0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x26d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x5005713,
+0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0xcb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0xbdbdf21,
+0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d;
+
+method crc32 (Str $c) {
+
+    my $crcinit = 0;
+    my $crc = $crcinit +^ 0xFFFFFFFF;
+
+    say 'Init crc calc.';
+
+    for $c.split('') {
+        my $char = $_.ord;
+        $crc = (($crc +> 8) +& 0x00FFFFFF) +^ @CRC_TABLE[ ($crc +^ $char) +& 0xFF ];
+    }
+
+    $crc +^= 0xFFFFFFFF;
+
+    return $crc;
+}
+

lib/String/CRC32.pod

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+=begin pod
+
+=head1 NAME
+
+String::CRC32 - Calculate 32-bit CRC checksum of strings
+
+=head1 SYNOPSIS
+
+    use v6;
+    use String::CRC32;
+
+    my $string = 'Hello, world';
+    my $crc32 = String::CRC32.crc32($string);
+
+=head1 DESCRIPTION
+
+The CRC32 module calculates CRC sums of 32 bit lenghts.
+It generates the same CRC values as ZMODEM, PKZIP, PICCHECK and many others.
+
+=head1 METHODS
+
+=head2 C<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'
+
+=head1 AUTHOR
+
+Cosimo Streppone, E<lt>cosimo@cpan.orgE<gt>
+
+Most bits shamelessly stolen from L<String::CRC32>
+for Perl 5, version 1.4 by Sönke J. Peters.
+
+=head1 COPYRIGHT
+
+I hereby include the COPYRIGHT section for Perl5 L<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.
+
+=end pod
+

t/000-load-module.t

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+use v6;
+use Test;
+
+use String::CRC32;
+
+ok(1, 'Module is loaded');
+
+done_testing;
+

t/crc.t

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+use v6;
+use Test;
+use String::CRC32;
+
+my $string1 = "This is the test string";
+
+is(
+    String::CRC32.crc32($string1), 1835534707,
+    "Test the CRC of a string variable"
+);
+
+is(
+    String::CRC32.crc32("This is another test string"), 2154698217,
+    "Test the CRC of another string variable"
+);
+
+is(
+    String::CRC32.crc32("Perl6 rocks"), 1413143404,
+    "Test the CRC of an awesome string",
+);
+
+done_testing;
+