Archive::Lha::CRC
use bytes; $crc = Archive::Lha::CRC::update( $crc, $str, length($str) );
This provides one utility function to calculate CRC-16, well, reversed CRC-16-IBM (X^16 + X^15 + X^2 + 1, not 0x8005 but 0xA001 one).
takes a previous value, a string, the length of the string in bytes, and returns the updated CRC-16 value. Note that this is a thin wrapper of a C function and you actually need to pass the length in bytes, in other words, sizeof(unsigned char). If you get a wrong value, check your input callback you pass to the Archive::Lha::Decode object. Your archive may be broken, but most probably you've converted something (say, the ends of line) to your (or your system's) taste implicitly.
Kenichi Ishigaki, <ishigaki@cpan.org>
Copyright (C) 2007 by Kenichi Ishigaki.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.