/src/wireshark/wsutil/crc16-plain.c
Line | Count | Source |
1 | | /* |
2 | | * crc16-plain.c |
3 | | * http://www.tty1.net/pycrc/faq_en.html#code-ownership |
4 | | * |
5 | | * Wireshark - Network traffic analyzer |
6 | | * By Gerald Combs <gerald@wireshark.org> |
7 | | * Copyright 1998 Gerald Combs |
8 | | * |
9 | | * SPDX-License-Identifier: GPL-2.0-or-later |
10 | | */ |
11 | | |
12 | | /** |
13 | | * \file crc16-plain.c |
14 | | * Functions and types for CRC checks. |
15 | | * |
16 | | * Generated on Wed Mar 18 14:12:09 2009, |
17 | | * by pycrc v0.7, http://www.tty1.net/pycrc/ |
18 | | * using the configuration: |
19 | | * Width = 16 |
20 | | * Poly = 0x8005 |
21 | | * XorIn = 0x0000 |
22 | | * ReflectIn = True |
23 | | * XorOut = 0x0000 |
24 | | * ReflectOut = True |
25 | | * Algorithm = table-driven |
26 | | * Direct = True |
27 | | * |
28 | | * Modified 2009-03-16 not to include <stdint.h> as our Win32 environment |
29 | | * appears not to have it; we're using GLib types, instead. |
30 | | * Modified 2023-06-28 to use C99 types. |
31 | | *****************************************************************************/ |
32 | | #include "wsutil/crc16-plain.h" |
33 | | |
34 | | /** |
35 | | * Static table used for the table_driven implementation. |
36 | | *****************************************************************************/ |
37 | | static const crc16_plain_t crc_table_reflected[256] = { |
38 | | 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241, |
39 | | 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440, |
40 | | 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40, |
41 | | 0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841, |
42 | | 0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40, |
43 | | 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41, |
44 | | 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641, |
45 | | 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040, |
46 | | 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240, |
47 | | 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441, |
48 | | 0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41, |
49 | | 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840, |
50 | | 0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41, |
51 | | 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40, |
52 | | 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640, |
53 | | 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041, |
54 | | 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240, |
55 | | 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441, |
56 | | 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41, |
57 | | 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840, |
58 | | 0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41, |
59 | | 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40, |
60 | | 0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640, |
61 | | 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041, |
62 | | 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241, |
63 | | 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440, |
64 | | 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40, |
65 | | 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841, |
66 | | 0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40, |
67 | | 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41, |
68 | | 0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641, |
69 | | 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040 |
70 | | }; |
71 | | |
72 | | /** |
73 | | * Reflect all bits of a \a data word of \a data_len bytes. |
74 | | * |
75 | | * \param data The data word to be reflected. |
76 | | * \param data_len The width of \a data expressed in number of bits. |
77 | | * \return The reflected data. |
78 | | *****************************************************************************/ |
79 | | long crc16_plain_reflect(long data, size_t data_len) |
80 | 0 | { |
81 | 0 | unsigned int i; |
82 | 0 | long ret; |
83 | |
|
84 | 0 | ret = data & 0x01; |
85 | 0 | for (i = 1; i < data_len; i++) |
86 | 0 | { |
87 | 0 | data >>= 1; |
88 | 0 | ret = (ret << 1) | (data & 0x01); |
89 | 0 | } |
90 | 0 | return ret; |
91 | 0 | } |
92 | | |
93 | | |
94 | | /** |
95 | | * Update the crc value with new data. |
96 | | * |
97 | | * \param crc The current crc value. |
98 | | * \param data Pointer to a buffer of \a data_len bytes. |
99 | | * \param data_len Number of bytes in the \a data buffer. |
100 | | * \return The updated crc value. |
101 | | *****************************************************************************/ |
102 | | crc16_plain_t crc16_plain_update(crc16_plain_t crc, const unsigned char *data, size_t data_len) |
103 | 6 | { |
104 | 6 | unsigned int tbl_idx; |
105 | | |
106 | 42 | while (data_len--) { |
107 | 36 | tbl_idx = (crc ^ *data) & 0xff; |
108 | 36 | crc = (crc_table_reflected[tbl_idx] ^ (crc >> 8)) & 0xffff; |
109 | | |
110 | 36 | data++; |
111 | 36 | } |
112 | 6 | return crc & 0xffff; |
113 | 6 | } |
114 | | |
115 | | /* Generated on Tue Jul 24 09:08:46 2012, |
116 | | * by pycrc v0.7.10, http://www.tty1.net/pycrc/ |
117 | | * using the configuration: |
118 | | * Width = 16 |
119 | | * Poly = 0x8005 |
120 | | * XorIn = 0x0000 |
121 | | * ReflectIn = False |
122 | | * XorOut = 0x0000 |
123 | | * ReflectOut = False |
124 | | * Algorithm = table-driven |
125 | | *****************************************************************************/ |
126 | | static const uint16_t crc16_table_8005_noreflect_noxor[256] = { |
127 | | 0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011, |
128 | | 0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022, |
129 | | 0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072, |
130 | | 0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041, |
131 | | 0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2, |
132 | | 0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1, |
133 | | 0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1, |
134 | | 0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082, |
135 | | 0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192, |
136 | | 0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1, |
137 | | 0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1, |
138 | | 0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2, |
139 | | 0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151, |
140 | | 0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162, |
141 | | 0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132, |
142 | | 0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101, |
143 | | 0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312, |
144 | | 0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321, |
145 | | 0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371, |
146 | | 0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342, |
147 | | 0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1, |
148 | | 0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2, |
149 | | 0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2, |
150 | | 0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381, |
151 | | 0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291, |
152 | | 0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2, |
153 | | 0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2, |
154 | | 0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1, |
155 | | 0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252, |
156 | | 0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261, |
157 | | 0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231, |
158 | | 0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202 |
159 | | }; |
160 | | |
161 | | /** |
162 | | * Calculate the crc-16 (x^16 + x^15 + x^2 + 1) value for data. Note that this |
163 | | * CRC is not equal to crc16_plain. |
164 | | * |
165 | | * \param data Pointer to a buffer of \a data_len bytes. |
166 | | * \param data_len Number of bytes in the \a data buffer. |
167 | | * \return The crc value. |
168 | | *****************************************************************************/ |
169 | | uint16_t crc16_8005_noreflect_noxor(const uint8_t *data, uint64_t data_len) |
170 | 0 | { |
171 | 0 | unsigned tbl_idx; |
172 | 0 | uint16_t crc = 0; |
173 | |
|
174 | 0 | while (data_len--) { |
175 | 0 | tbl_idx = ((crc >> 8) ^ *data) & 0xff; |
176 | 0 | crc = (crc16_table_8005_noreflect_noxor[tbl_idx] ^ (crc << 8)) & 0xffff; |
177 | |
|
178 | 0 | data++; |
179 | 0 | } |
180 | 0 | return crc & 0xffff; |
181 | 0 | } |
182 | | |
183 | | /* |
184 | | * Editor modelines - https://www.wireshark.org/tools/modelines.html |
185 | | * |
186 | | * Local variables: |
187 | | * c-basic-offset: 4 |
188 | | * tab-width: 8 |
189 | | * indent-tabs-mode: nil |
190 | | * End: |
191 | | * |
192 | | * vi: set shiftwidth=4 tabstop=8 expandtab: |
193 | | * :indentSize=4:tabSize=8:noTabs=true: |
194 | | */ |