paul@frcs.UUCP (Paul Nash) (04/18/91)
I am looking for C source code to implement the CRC-16 algorithm. I have seen various from time to time, but cannot think of a place. If you have a suitable (short) routine, please post it or mail me a copy, or tell me where I can find one. Many thanks ---=---=---=---=---=---=---=---=---=---=---=---=---=---=---=---=---=--- Paul Nash Free Range Computer Systems cc paul@frcs.UUCP ...!uunet!m2xenix!frcs!paul
oz@yunexus.yorku.ca (Ozan Yigit) (04/24/91)
In article <461@frcs.UUCP> paul@frcs.UUCP (Paul Nash) writes: >I am looking for C source code to implement the CRC-16 algorithm. I sent you something that may be of some use. In case you need some literature refs for future use, here is something that is easy to implement: %A Georgia Griffiths %A G. Carlyle Stones %T The Tea-Leaf Reader Algorithm: An Efficient Implementation of CRC-16 and CRC-32 %J Communications of the ACM %V 30 %N 7 %D 1987 %P 617-620 hope this is useful. oz --- SunOS: There are many edible ways to serve | internet: oz@nexus.yorku.ca up scrambled eggs, but one cannot get them | uucp: utzoo/utai!yunexus!oz back as over-easy or sunny side up. -- oz | phone: [416] 736 5257x33976
gwyn@smoke.brl.mil (Doug Gwyn) (04/24/91)
In article <461@frcs.UUCP> paul@frcs.UUCP (Paul Nash) writes: >I am looking for C source code to implement the CRC-16 algorithm. I >have seen various from time to time, but cannot think of a place. If >you have a suitable (short) routine, please post it or mail me a copy, >or tell me where I can find one. In the past few days, R.Hyde and I have been using CRC-16 as an example for comparison of programming in C vs. assembler, in the comp.sys.apple2 newsgroup. If it hasn't yet expired on your site, grep the archives for "crc".
vg@sjoki.uta.fi (Vesa Gynther) (04/24/91)
I remember seeing a code fragment in SEA ARC v. 5.12 source code, which was used to calculate 16 bit CRC's. The hard part is - I don't remember where I found that source code. Probably you'll find it in some well equipped anon ftp site (simtel20 ?) =-)
ake@dayton.saic.com (Earle Ake) (04/24/91)
In article <461@frcs.UUCP>, paul@frcs.UUCP (Paul Nash) writes: > > I am looking for C source code to implement the CRC-16 algorithm. I > have seen various from time to time, but cannot think of a place. If > you have a suitable (short) routine, please post it or mail me a copy, > or tell me where I can find one. int calcrc(prt, count) char *ptr; int count; { int crc, i; crc = 0; while (--count >= 0) { crc = crc ^ (int)*ptr++ << 8; for (i = 0; i < 8; ++i) if (crc & 0x8000) crc = crc << 1 ^ 0x1021; else crc = crc << 1; } return (crc & 0xFFFF); } Earle _____________________________________________________________________________ ____ ____ ___ Earle Ake /___ /___/ / / Science Applications International Corporation ____// / / /__ Dayton, Ohio ----------------------------------------------------------------------------- Internet: ake@dayton.saic.com uucp: dayvb!ake SPAN: 28284::ake
Demoel@Fwva.Saic.Com (Ed de Moel) (04/24/91)
vg@sjoki.uta.fi (Vesa Gynther) writes: >I remember seeing a code fragment in SEA ARC v. 5.12 source code, which was >used to calculate 16 bit CRC's. The hard part is - I don't remember where >I found that source code. Probably you'll find it in some well equipped >anon ftp site (simtel20 ?) =-) I've seen the code posted on this mailgroup. What I am looking for is a reference to the standard that defines it. I know the algorithm and have code that executes it. Anyone out there who knows the name of the standard? As far as my knowledge goes, it must be a CCITT standard, but what is the number? Thanks in advance, Ed