NAME: Adler32
CREATOR: Mark Adler
PB AUTHOR: Wayne Diamond, Marc Sven Schulte
DESCRIPTION: Adler-32 is an algorithm used by ZIP files that creates a 32-bit checksum. The algorithm is approximately 33% faster than CRC32, and nearly as reliable. Adler32 is a 32-bit extension and improvement of the Fletcher algorithm, used in the ITU-T x.224 / ISO 8073 standard.
NOTES: Adler32 is also known as Fletch-32/Fletcher-32, and is used in ZLib. Marc Sven Schulte has recently (July 2003) written a faster PB implementation that my original (see below).
SOURCE: http://www.powerbasic.com/support/forums/Forum7/HTML/001333.html