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4 Commits

Author SHA1 Message Date
Roger Knecht
7799164595 crc-itu-t: fix typo in CRC ITU-T polynomial comment 
The code comment says that the polynomial is x^16 + x^12 + x^15 + 1, but
the correct polynomial is x^16 + x^12 + x^5 + 1. Quoting from page 2 in
the ITU-T V.41 specification [1]:

  2 Encoding and checking process

  The service bits and information bits, taken in conjunction,
  correspond to the coefficients of a message polynomial having terms
  from x^(n-1) (n = total number of bits in a block or sequence) down to
  x^16. This polynomial is divided, modulo 2, by the generating
  polynomial x^16 + x^12 + x^5 + 1.

The hex (truncated) polynomial 0x1021 and CRC code implementation are
correct, however.

[1] https://www.itu.int/rec/T-REC-V.41-198811-I/en

Signed-off-by: Roger Knecht <roger@norberthealth.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2022-06-07 10:27:38 +02:00
Thomas Gleixner
40b0b3f8fb treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230 
Based on 2 normalized pattern(s):

  this source code is licensed under the gnu general public license
  version 2 see the file copying for more details

  this source code is licensed under general public license version 2
  see

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 52 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190602204653.449021192@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2019-06-19 17:09:06 +02:00
Antonio Ospite
94268fcd9a lib: crc-itu-t.[ch] fix 0x0x prefix in integer constants 
Signed-off-by: Antonio Ospite <ao2@ao2.it>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
 2015-05-26 15:26:43 +02:00
Ivo van Doorn
3e7cbae7c6 CRC ITU-T V.41 
This will add the CRC calculation according
to the CRC ITU-T V.41 to the kernel lib/ folder.

This code has been derived from the rt2x00 driver,
currently found only in the wireless-dev tree, but
this library is generic and could be used by more
drivers who currently use their own implementation.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>

Also useful for the new firewire stack.

Signed-off-by: Kristian Hoegsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
 2007-05-10 18:24:13 +02:00