/src/wireshark/wsutil/crc7.c
Line | Count | Source |
1 | | /** |
2 | | * crc7.c |
3 | | * |
4 | | * Functions and types for CRC checks. |
5 | | * |
6 | | * Wireshark - Network traffic analyzer |
7 | | * By Gerald Combs <gerald@wireshark.org> |
8 | | * Copyright 1998 Gerald Combs |
9 | | * |
10 | | * SPDX-License-Identifier: GPL-2.0-or-later |
11 | | * |
12 | | * |
13 | | * Generated on Wed Jul 11 17:24:30 2012, |
14 | | * by pycrc v0.7.10, http://www.tty1.net/pycrc/ |
15 | | * using the configuration: |
16 | | * Width = 7 |
17 | | * Poly = 0x45 |
18 | | * XorIn = 0x00 |
19 | | * ReflectIn = False |
20 | | * XorOut = 0x00 |
21 | | * ReflectOut = False |
22 | | * Algorithm = table-driven |
23 | | *****************************************************************************/ |
24 | | #include "config.h" |
25 | | |
26 | | #include "crc7.h" /* include the header file generated with pycrc */ |
27 | | |
28 | | /** |
29 | | * Static table used for the table_driven implementation. |
30 | | *****************************************************************************/ |
31 | | static const uint8_t crc_table[256] = { |
32 | | 0x00, 0x8a, 0x9e, 0x14, 0xb6, 0x3c, 0x28, 0xa2, 0xe6, 0x6c, 0x78, 0xf2, 0x50, 0xda, 0xce, 0x44, |
33 | | 0x46, 0xcc, 0xd8, 0x52, 0xf0, 0x7a, 0x6e, 0xe4, 0xa0, 0x2a, 0x3e, 0xb4, 0x16, 0x9c, 0x88, 0x02, |
34 | | 0x8c, 0x06, 0x12, 0x98, 0x3a, 0xb0, 0xa4, 0x2e, 0x6a, 0xe0, 0xf4, 0x7e, 0xdc, 0x56, 0x42, 0xc8, |
35 | | 0xca, 0x40, 0x54, 0xde, 0x7c, 0xf6, 0xe2, 0x68, 0x2c, 0xa6, 0xb2, 0x38, 0x9a, 0x10, 0x04, 0x8e, |
36 | | 0x92, 0x18, 0x0c, 0x86, 0x24, 0xae, 0xba, 0x30, 0x74, 0xfe, 0xea, 0x60, 0xc2, 0x48, 0x5c, 0xd6, |
37 | | 0xd4, 0x5e, 0x4a, 0xc0, 0x62, 0xe8, 0xfc, 0x76, 0x32, 0xb8, 0xac, 0x26, 0x84, 0x0e, 0x1a, 0x90, |
38 | | 0x1e, 0x94, 0x80, 0x0a, 0xa8, 0x22, 0x36, 0xbc, 0xf8, 0x72, 0x66, 0xec, 0x4e, 0xc4, 0xd0, 0x5a, |
39 | | 0x58, 0xd2, 0xc6, 0x4c, 0xee, 0x64, 0x70, 0xfa, 0xbe, 0x34, 0x20, 0xaa, 0x08, 0x82, 0x96, 0x1c, |
40 | | 0xae, 0x24, 0x30, 0xba, 0x18, 0x92, 0x86, 0x0c, 0x48, 0xc2, 0xd6, 0x5c, 0xfe, 0x74, 0x60, 0xea, |
41 | | 0xe8, 0x62, 0x76, 0xfc, 0x5e, 0xd4, 0xc0, 0x4a, 0x0e, 0x84, 0x90, 0x1a, 0xb8, 0x32, 0x26, 0xac, |
42 | | 0x22, 0xa8, 0xbc, 0x36, 0x94, 0x1e, 0x0a, 0x80, 0xc4, 0x4e, 0x5a, 0xd0, 0x72, 0xf8, 0xec, 0x66, |
43 | | 0x64, 0xee, 0xfa, 0x70, 0xd2, 0x58, 0x4c, 0xc6, 0x82, 0x08, 0x1c, 0x96, 0x34, 0xbe, 0xaa, 0x20, |
44 | | 0x3c, 0xb6, 0xa2, 0x28, 0x8a, 0x00, 0x14, 0x9e, 0xda, 0x50, 0x44, 0xce, 0x6c, 0xe6, 0xf2, 0x78, |
45 | | 0x7a, 0xf0, 0xe4, 0x6e, 0xcc, 0x46, 0x52, 0xd8, 0x9c, 0x16, 0x02, 0x88, 0x2a, 0xa0, 0xb4, 0x3e, |
46 | | 0xb0, 0x3a, 0x2e, 0xa4, 0x06, 0x8c, 0x98, 0x12, 0x56, 0xdc, 0xc8, 0x42, 0xe0, 0x6a, 0x7e, 0xf4, |
47 | | 0xf6, 0x7c, 0x68, 0xe2, 0x40, 0xca, 0xde, 0x54, 0x10, 0x9a, 0x8e, 0x04, 0xa6, 0x2c, 0x38, 0xb2 |
48 | | }; |
49 | | |
50 | | |
51 | | |
52 | | /** |
53 | | * Update the crc value with new data. |
54 | | * |
55 | | * \param crc The current crc value. |
56 | | * \param data Pointer to a buffer of \a data_len bytes. |
57 | | * \param data_len Number of bytes in the \a data buffer. |
58 | | * \return The updated crc value. |
59 | | *****************************************************************************/ |
60 | | uint8_t crc7update(uint8_t crc, const unsigned char *data, int data_len) |
61 | 0 | { |
62 | 0 | unsigned int tbl_idx; |
63 | |
|
64 | 0 | while (data_len--) { |
65 | 0 | tbl_idx = ((crc >> 0) ^ *data) & 0xff; |
66 | 0 | crc = (crc_table[tbl_idx] ^ (crc << (8 - 1))) & (0x7f << 1); |
67 | |
|
68 | 0 | data++; |
69 | 0 | } |
70 | 0 | return crc & (0x7f << 1); |
71 | 0 | } |
72 | | |
73 | | /* |
74 | | * Editor modelines - https://www.wireshark.org/tools/modelines.html |
75 | | * |
76 | | * Local variables: |
77 | | * c-basic-offset: 4 |
78 | | * tab-width: 8 |
79 | | * indent-tabs-mode: nil |
80 | | * End: |
81 | | * |
82 | | * vi: set shiftwidth=4 tabstop=8 expandtab: |
83 | | * :indentSize=4:tabSize=8:noTabs=true: |
84 | | */ |