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1 office 1 /* crc16.h
2 * Declaration of CRC-16 routines and table
3 *
4 * 2004 Richard van der Hoff <richardv@mxtelecom.com>
5 *
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 */
24  
25 #ifndef __CRC16_H__
26 #define __CRC16_H__
27  
28 #include "ws_symbol_export.h"
29  
30 #ifdef __cplusplus
31 extern "C" {
32 #endif /* __cplusplus */
33  
34 /* Calculate the CCITT/ITU/CRC-16 16-bit CRC
35  
36 (parameters for this CRC are:
37 Polynomial: x^16 + x^12 + x^5 + 1 (0x1021);
38 Start value 0xFFFF;
39 XOR result with 0xFFFF;
40 First bit is LSB)
41 */
42  
43 /** Compute CRC16 CCITT checksum of a buffer of data.
44 @param buf The buffer containing the data.
45 @param len The number of bytes to include in the computation.
46 @return The CRC16 CCITT checksum. */
47 WS_DLL_PUBLIC guint16 crc16_ccitt(const guint8 *buf, guint len);
48  
49 /** Compute CRC16 X.25 CCITT checksum of a buffer of data.
50 @param buf The buffer containing the data.
51 @param len The number of bytes to include in the computation.
52 @return The CRC16 X.25 CCITT checksum. */
53 WS_DLL_PUBLIC guint16 crc16_x25_ccitt_seed(const guint8 *buf, guint len, guint16 seed);
54  
55 /** Compute CRC16 CCITT checksum of a buffer of data. If computing the
56 * checksum over multiple buffers and you want to feed the partial CRC16
57 * back in, remember to take the 1's complement of the partial CRC16 first.
58 @param buf The buffer containing the data.
59 @param len The number of bytes to include in the computation.
60 @param seed The seed to use.
61 @return The CRC16 CCITT checksum (using the given seed). */
62 WS_DLL_PUBLIC guint16 crc16_ccitt_seed(const guint8 *buf, guint len, guint16 seed);
63  
64 /** Compute the 16bit CRC_A value of a buffer as defined in ISO14443-3.
65 @param buf The buffer containing the data.
66 @param len The number of bytes to include in the computation.
67 @return the CRC16 checksum for the buffer */
68 WS_DLL_PUBLIC guint16 crc16_iso14443a(const guint8 *buf, guint len);
69  
70 /** Calculates a CRC16 checksum for the given buffer with the polynom
71 * 0x5935 using a precompiled CRC table
72 * @param buf a pointer to a buffer of the given length
73 * @param len the length of the given buffer
74 * @param seed The seed to use.
75 * @return the CRC16 checksum for the buffer
76 */
77 WS_DLL_PUBLIC guint16 crc16_0x5935(const guint8 *buf, guint32 len, guint16 seed);
78  
79 /** Calculates a CRC16 checksum for the given buffer with the polynom
80 * 0x755B using a precompiled CRC table
81 * @param buf a pointer to a buffer of the given length
82 * @param len the length of the given buffer
83 * @param seed The seed to use.
84 * @return the CRC16 checksum for the buffer
85 */
86 WS_DLL_PUBLIC guint16 crc16_0x755B(const guint8 *buf, guint32 len, guint16 seed);
87  
88 /** Computes CRC16 checksum for the given data with the polynom 0x9949 using
89 * precompiled CRC table
90 * @param buf a pointer to a buffer of the given length
91 * @param len the length of the given buffer
92 * @param seed The seed to use.
93 * @return the CRC16 checksum for the buffer
94 */
95 WS_DLL_PUBLIC guint16 crc16_0x9949_seed(const guint8 *buf, guint len, guint16 seed);
96  
97 /** Computes CRC16 checksum for the given data with the polynom 0x3D65 using
98 * precompiled CRC table
99 * @param buf a pointer to a buffer of the given length
100 * @param len the length of the given buffer
101 * @param seed The seed to use.
102 * @return the CRC16 checksum for the buffer
103 */
104 WS_DLL_PUBLIC guint16 crc16_0x3D65_seed(const guint8 *buf, guint len, guint16 seed);
105  
106 #ifdef __cplusplus
107 }
108 #endif /* __cplusplus */
109  
110 #endif /* crc16.h */