1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * crc-itu-t.c
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/types.h>
7*4882a593Smuzhiyun #include <linux/module.h>
8*4882a593Smuzhiyun #include <linux/crc-itu-t.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /** CRC table for the CRC ITU-T V.41 0x1021 (x^16 + x^12 + x^15 + 1) */
11*4882a593Smuzhiyun const u16 crc_itu_t_table[256] = {
12*4882a593Smuzhiyun 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
13*4882a593Smuzhiyun 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
14*4882a593Smuzhiyun 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
15*4882a593Smuzhiyun 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
16*4882a593Smuzhiyun 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
17*4882a593Smuzhiyun 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
18*4882a593Smuzhiyun 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
19*4882a593Smuzhiyun 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
20*4882a593Smuzhiyun 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
21*4882a593Smuzhiyun 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
22*4882a593Smuzhiyun 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
23*4882a593Smuzhiyun 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
24*4882a593Smuzhiyun 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
25*4882a593Smuzhiyun 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
26*4882a593Smuzhiyun 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
27*4882a593Smuzhiyun 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
28*4882a593Smuzhiyun 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
29*4882a593Smuzhiyun 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
30*4882a593Smuzhiyun 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
31*4882a593Smuzhiyun 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
32*4882a593Smuzhiyun 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
33*4882a593Smuzhiyun 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
34*4882a593Smuzhiyun 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
35*4882a593Smuzhiyun 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
36*4882a593Smuzhiyun 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
37*4882a593Smuzhiyun 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
38*4882a593Smuzhiyun 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
39*4882a593Smuzhiyun 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
40*4882a593Smuzhiyun 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
41*4882a593Smuzhiyun 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
42*4882a593Smuzhiyun 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
43*4882a593Smuzhiyun 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
44*4882a593Smuzhiyun };
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun EXPORT_SYMBOL(crc_itu_t_table);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun /**
49*4882a593Smuzhiyun * crc_itu_t - Compute the CRC-ITU-T for the data buffer
50*4882a593Smuzhiyun *
51*4882a593Smuzhiyun * @crc: previous CRC value
52*4882a593Smuzhiyun * @buffer: data pointer
53*4882a593Smuzhiyun * @len: number of bytes in the buffer
54*4882a593Smuzhiyun *
55*4882a593Smuzhiyun * Returns the updated CRC value
56*4882a593Smuzhiyun */
crc_itu_t(u16 crc,const u8 * buffer,size_t len)57*4882a593Smuzhiyun u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun while (len--)
60*4882a593Smuzhiyun crc = crc_itu_t_byte(crc, *buffer++);
61*4882a593Smuzhiyun return crc;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun EXPORT_SYMBOL(crc_itu_t);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun MODULE_DESCRIPTION("CRC ITU-T V.41 calculations");
66*4882a593Smuzhiyun MODULE_LICENSE("GPL");
67*4882a593Smuzhiyun
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