{ unix cksum, CRC32. -- Jonathan Neuschäfer <j.neuschaefer@gmx.net> }
[[$0>][\2*\1-]#%]l:[0\128[$0>][$2O&0>[$@\64/x;!@@$g;*@x;!@@]?2/]#%%]h:
[[$0>][\2/\1-]#%]r:[1O$8 28l;!1-&$@=~\24r;!\[128|]?x;!h;!\8l;!x;!]s:79764919g:
[q1_0[\1+\^$1_>]s;#%@%\$@[1O0>][1O255&s;!\8r;!\]#~n;!32,%.10,]m:[$2O&@@|~|~]x:
[$0\>\1O[$u;!]?\~[$.]?%]n:[h;y:[3+O]h:255[$0>][$y;!\1-]#m;!256[$0>][\%1-]#%]o:
[1000$$**0@[$$0\>\4O\>~|][2O-\1+\]#\.\[10/$0>][\$2O/$.2O*-\]#%%]u: {width: 78}
{ usage: run m for "main" or o for "optimized" (builds a lookup table) }   o;!