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internet
Internet checksum


Vocabulary
checksums.internet

Class description
Internet (RFC1071) checksum algorithm.

Definition
IN: checksums.internet

SINGLETON: internet


Methods
USING: checksums checksums.internet grouping io.binary kernel
math sequences ;

M: internet checksum-bytes
drop 2 <groups> [ le> ] map-sum
[ -16 shift ] [ 65535 bitand ] bi + [ -16 shift ] keep +
bitnot 2 >le ;