aboutsummaryrefslogtreecommitdiffstats
path: root/lib
diff options
context:
space:
mode:
authorIvo van Doorn <IvDoorn@gmail.com>2006-06-12 10:17:04 -0400
committerStefan Richter <stefanr@s5r6.in-berlin.de>2007-05-10 12:24:13 -0400
commit3e7cbae7c6dda18d427335b3ad98f1a0d40ef30c (patch)
tree2ac604d8d6f4eb671e23c9b6a405c37b92fa8df3 /lib
parent9640d3d775aa325650c8fcdf49127542f77b2156 (diff)
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 'lib')
-rw-r--r--lib/Kconfig8
-rw-r--r--lib/Makefile1
-rw-r--r--lib/crc-itu-t.c69
3 files changed, 78 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 384249915047..91477b9dc924 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -23,6 +23,14 @@ config CRC16
23 the kernel tree does. Such modules that use library CRC16 23 the kernel tree does. Such modules that use library CRC16
24 functions require M here. 24 functions require M here.
25 25
26config CRC_ITU_T
27 tristate "CRC ITU-T V.41 functions"
28 help
29 This option is provided for the case where no in-kernel-tree
30 modules require CRC ITU-T V.41 functions, but a module built outside
31 the kernel tree does. Such modules that use library CRC ITU-T V.41
32 functions require M here.
33
26config CRC32 34config CRC32
27 tristate "CRC32 functions" 35 tristate "CRC32 functions"
28 default y 36 default y
diff --git a/lib/Makefile b/lib/Makefile
index 992a39ef9ffd..2a9e47cc7f22 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -40,6 +40,7 @@ endif
40obj-$(CONFIG_BITREVERSE) += bitrev.o 40obj-$(CONFIG_BITREVERSE) += bitrev.o
41obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o 41obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o
42obj-$(CONFIG_CRC16) += crc16.o 42obj-$(CONFIG_CRC16) += crc16.o
43obj-$(CONFIG_CRC_ITU_T) += crc-itu-t.o
43obj-$(CONFIG_CRC32) += crc32.o 44obj-$(CONFIG_CRC32) += crc32.o
44obj-$(CONFIG_LIBCRC32C) += libcrc32c.o 45obj-$(CONFIG_LIBCRC32C) += libcrc32c.o
45obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o 46obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
diff --git a/lib/crc-itu-t.c b/lib/crc-itu-t.c
new file mode 100644
index 000000000000..a63472b82416
--- /dev/null
+++ b/lib/crc-itu-t.c
@@ -0,0 +1,69 @@
1/*
2 * crc-itu-t.c
3 *
4 * This source code is licensed under the GNU General Public License,
5 * Version 2. See the file COPYING for more details.
6 */
7
8#include <linux/types.h>
9#include <linux/module.h>
10#include <linux/crc-itu-t.h>
11
12/** CRC table for the CRC ITU-T V.41 0x0x1021 (x^16 + x^12 + x^15 + 1) */
13const u16 crc_itu_t_table[256] = {
14 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
15 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
16 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
17 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
18 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
19 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
20 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
21 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
22 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
23 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
24 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
25 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
26 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
27 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
28 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
29 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
30 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
31 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
32 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
33 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
34 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
35 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
36 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
37 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
38 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
39 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
40 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
41 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
42 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
43 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
44 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
45 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
46};
47
48EXPORT_SYMBOL(crc_itu_t_table);
49
50/**
51 * crc_itu_t - Compute the CRC-ITU-T for the data buffer
52 *
53 * @crc: previous CRC value
54 * @buffer: data pointer
55 * @len: number of bytes in the buffer
56 *
57 * Returns the updated CRC value
58 */
59u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len)
60{
61 while (len--)
62 crc = crc_itu_t_byte(crc, *buffer++);
63 return crc;
64}
65EXPORT_SYMBOL(crc_itu_t);
66
67MODULE_DESCRIPTION("CRC ITU-T V.41 calculations");
68MODULE_LICENSE("GPL");
69