CRC2, CRCFast and CRCTab ports for 68k and PPC,
including sources. Author unknown.
The difference 68k -> PPC gets significant
on large files, e.g. greater 1 MB.
PPC binaries are useable from Shell when being
used with ppc.library V46+
1.0: - PPC/68k port for Amiga
1.1: - changed "unsigned int" to "unsigned short int" in
both, crc2.c and crcfast.c
- no more regargs for the 68k version (PPC, too)
- fixed array overflow in crcfast.c
- hopefully works ok now - if not, feel free to
send bug reports by *email*
--
ARK, 27/Aug/98
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Note:
In the past, some guy called "SPH" took most of my free PPC ports
(those where the sources have been included) and ported them to WOS.
While I've nothing against WOS ports, an other point is very distasteful
and unfair in my opinion: removing all references to my name and initials
and simply replacing those with his own, while also removing all references
to PPC-Lib/ELF and replacing those with WOS references and usually some flames
or even offenses against the competing kernel and porter - without actually
rewriting the readme text itself in a major way (for example, if I describe what
*I* specifically did for the port - and what he didn't have to do a *second* time,
of course - he does not even remove/change *those* notes and/or give me credit).
This leads to the strange situation, that I hereby have to copyright this
.readme text, to claim its authorship and forbid changes which aren't
clearly marked as being changes to the original: While quotes may have
been derived from other parts of the distribution, the whole .readme as
such now is (C)opyrighted by Andreas R. Kleinert in 1998.
Copyrights to the other files remain as such. Nevertheless I'd ask anyone
to give me credit for the changes which I did myself and which of
course have been labeled/marked/documented as such. Even free software
lives from respecting the intellectual work and property of others. Thank you.
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Cyclic Redundancy Check
---------------------------------------------------------
This archive includes the following three files:
crc2.c Computes crc by bit shifting
crcfast.c Computes crc by table lookup
crctab.c Computes tables used in crcfast.c
crc.doc This file
The utilities crc2 and crcfast compute the cyclic redundancy checks
for both the crc-16 (used in arc files) and crc-ccitt (used in xmodem).
crcfast is faster than crc2. These routines compute the crc's for a
given file as a means of checking data integrity.
These routines compile without change under Turbo C. All are
short and illustrate the basic principles of crc calculations.
CRC References:
C Programmer's Guide to Serial Communications, J. Compbell,
Howard W. Sams & Co.,(1987)
The Great CRC Mystery, T. Ritter, Dr. Dobb's Journal,
(February 1986)
Byte-Wise CRC Calculations, A. Perez, Wismer, & Becker,
IEEE Micro, (June 1983)
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