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.

The author of this package disclaims all copyrights and 

releases it into the public domain.