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\ Hypervisor Software File: in-cksum.fth
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id: @(#)in-cksum.fth 1.1 04/09/07
purpose: Internet checksum computation
copyright: Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

\ RFC 1071: Computing the Internet Checksum

\ Exploit the fact that the checksum can be computed in either byte
\ order to speed up its calculation.

headerless

: (in-cksum) ( accumulator adr len -- checksum )
   2dup >r >r  bounds ?do  i w@ +  /w +loop
   r> r> dup  1 and  if  ca+ c@ -  else  2drop  then
;

: in-cksum ( accumulator adr len -- checksum )
   (in-cksum)  lwsplit +  lwsplit +  invert  h# ffff and
;

headers
openbios/openboot/obp/pkg/netinet/in-cksum.fth

Commit

obp/pkg/netinet/in-cksum.fth
