1*27b03b36SApple OSS Distributions /*
2*27b03b36SApple OSS Distributions * Copyright (c) 2016-2018 Apple Inc. All rights reserved.
3*27b03b36SApple OSS Distributions *
4*27b03b36SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5*27b03b36SApple OSS Distributions *
6*27b03b36SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code
7*27b03b36SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License
8*27b03b36SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in
9*27b03b36SApple OSS Distributions * compliance with the License. The rights granted to you under the License
10*27b03b36SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of,
11*27b03b36SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to
12*27b03b36SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any
13*27b03b36SApple OSS Distributions * terms of an Apple operating system software license agreement.
14*27b03b36SApple OSS Distributions *
15*27b03b36SApple OSS Distributions * Please obtain a copy of the License at
16*27b03b36SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file.
17*27b03b36SApple OSS Distributions *
18*27b03b36SApple OSS Distributions * The Original Code and all software distributed under the License are
19*27b03b36SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20*27b03b36SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21*27b03b36SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22*27b03b36SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23*27b03b36SApple OSS Distributions * Please see the License for the specific language governing rights and
24*27b03b36SApple OSS Distributions * limitations under the License.
25*27b03b36SApple OSS Distributions *
26*27b03b36SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27*27b03b36SApple OSS Distributions */
28*27b03b36SApple OSS Distributions
29*27b03b36SApple OSS Distributions #include <sys/systm.h>
30*27b03b36SApple OSS Distributions
31*27b03b36SApple OSS Distributions static uint16_t crc16_tab[256] = {
32*27b03b36SApple OSS Distributions 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
33*27b03b36SApple OSS Distributions 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440,
34*27b03b36SApple OSS Distributions 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40,
35*27b03b36SApple OSS Distributions 0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841,
36*27b03b36SApple OSS Distributions 0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40,
37*27b03b36SApple OSS Distributions 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
38*27b03b36SApple OSS Distributions 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641,
39*27b03b36SApple OSS Distributions 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
40*27b03b36SApple OSS Distributions 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240,
41*27b03b36SApple OSS Distributions 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441,
42*27b03b36SApple OSS Distributions 0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41,
43*27b03b36SApple OSS Distributions 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
44*27b03b36SApple OSS Distributions 0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41,
45*27b03b36SApple OSS Distributions 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
46*27b03b36SApple OSS Distributions 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640,
47*27b03b36SApple OSS Distributions 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
48*27b03b36SApple OSS Distributions 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240,
49*27b03b36SApple OSS Distributions 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
50*27b03b36SApple OSS Distributions 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41,
51*27b03b36SApple OSS Distributions 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
52*27b03b36SApple OSS Distributions 0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41,
53*27b03b36SApple OSS Distributions 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
54*27b03b36SApple OSS Distributions 0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640,
55*27b03b36SApple OSS Distributions 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
56*27b03b36SApple OSS Distributions 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241,
57*27b03b36SApple OSS Distributions 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
58*27b03b36SApple OSS Distributions 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40,
59*27b03b36SApple OSS Distributions 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
60*27b03b36SApple OSS Distributions 0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40,
61*27b03b36SApple OSS Distributions 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
62*27b03b36SApple OSS Distributions 0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641,
63*27b03b36SApple OSS Distributions 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040
64*27b03b36SApple OSS Distributions };
65*27b03b36SApple OSS Distributions
66*27b03b36SApple OSS Distributions
67*27b03b36SApple OSS Distributions uint16_t
crc16(uint16_t crc,const void * buf,size_t size)68*27b03b36SApple OSS Distributions crc16(uint16_t crc, const void *buf, size_t size)
69*27b03b36SApple OSS Distributions {
70*27b03b36SApple OSS Distributions const uint8_t *p;
71*27b03b36SApple OSS Distributions
72*27b03b36SApple OSS Distributions p = buf;
73*27b03b36SApple OSS Distributions
74*27b03b36SApple OSS Distributions while (size--) {
75*27b03b36SApple OSS Distributions crc = crc16_tab[(crc ^ (*p++)) & 0xFF] ^ (crc >> 8);
76*27b03b36SApple OSS Distributions }
77*27b03b36SApple OSS Distributions
78*27b03b36SApple OSS Distributions return crc;
79*27b03b36SApple OSS Distributions }
80*27b03b36SApple OSS Distributions
81*27b03b36SApple OSS Distributions #if KASAN
82*27b03b36SApple OSS Distributions uint16_t
__nosan_crc16(uint16_t crc,const void * buf,size_t size)83*27b03b36SApple OSS Distributions __nosan_crc16(uint16_t crc, const void *buf, size_t size)
84*27b03b36SApple OSS Distributions {
85*27b03b36SApple OSS Distributions const uint8_t *p = buf;
86*27b03b36SApple OSS Distributions
87*27b03b36SApple OSS Distributions while (size--) {
88*27b03b36SApple OSS Distributions crc = crc16_tab[(crc ^ (*p++)) & 0xFF] ^ (crc >> 8);
89*27b03b36SApple OSS Distributions }
90*27b03b36SApple OSS Distributions
91*27b03b36SApple OSS Distributions return crc;
92*27b03b36SApple OSS Distributions }
93*27b03b36SApple OSS Distributions #endif
94