that helped, 128!:3 can do any of the functions here:
http://en.wikipedia.org/wiki/Polynomial_representations_of_cyclic_redundancy_checks The default x value hfd _306674912 edb88320 and is "reverse crc-32" 16b04c11db7 is "normal crc 32" This does not seem to match online crc 32 calculators though. ----- Original Message ----- From: Raul Miller <[email protected]> To: Programming forum <[email protected]> Cc: Sent: Wednesday, April 15, 2015 6:19 PM Subject: Re: [Jprogramming] 128!:3 128!:3 has width=32 and init=16ffffffff Here's the CRC32 checksum (which has poly 0x04c11db7) using 128!:3: (#.|.(32#:2)#:016b04c11db7)&(128!:3) That said,, I don't see any examples (starting text, ending checksum) so it would be tedious to determine whether the default 128!:3 polynomial has an exact equivalence. Thanks, -- Raul On Wed, Apr 15, 2015 at 5:28 PM, 'Pascal Jasmin' via Programming <[email protected]> wrote: > is there a named algorithm equivalence of 128!:3 to one in this list ? > > > http://reveng.sourceforge.net/crc-catalogue/all.htm > > I understand its crc32, but there are several. > > Also I note that to get the documentation's result I need to take the 2s > complement > > ]&.(2&#. inv) 128!:3 'assiduously avoid any and all asinine alliterations' > 1439575093 > > (j8.02 64 and j6.01 32) > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
