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| author | Ivo van Doorn <IvDoorn@gmail.com> | 2006-06-12 18:17:04 +0400 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-05-10 20:24:13 +0400 |
| commit | 3e7cbae7c6dda18d427335b3ad98f1a0d40ef30c (patch) | |
| tree | 2ac604d8d6f4eb671e23c9b6a405c37b92fa8df3 /include | |
| parent | 9640d3d775aa325650c8fcdf49127542f77b2156 (diff) | |
| download | linux-3e7cbae7c6dda18d427335b3ad98f1a0d40ef30c.tar.xz | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/crc-itu-t.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/crc-itu-t.h b/include/linux/crc-itu-t.h new file mode 100644 index 000000000000..84920f3cc83e --- /dev/null +++ b/include/linux/crc-itu-t.h @@ -0,0 +1,28 @@ +/* + * crc-itu-t.h - CRC ITU-T V.41 routine + * + * Implements the standard CRC ITU-T V.41: + * Width 16 + * Poly 0x0x1021 (x^16 + x^12 + x^15 + 1) + * Init 0 + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#ifndef CRC_ITU_T_H +#define CRC_ITU_T_H + +#include <linux/types.h> + +extern u16 const crc_itu_t_table[256]; + +extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len); + +static inline u16 crc_itu_t_byte(u16 crc, const u8 data) +{ + return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff]; +} + +#endif /* CRC_ITU_T_H */ + |