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1 office 1 /* crc32.h
2 * Declaration of CRC-32 routine and table
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22  
23 #ifndef __CRC32_H__
24 #define __CRC32_H__
25  
26 #include "ws_symbol_export.h"
27  
28 #ifdef __cplusplus
29 extern "C" {
30 #endif /* __cplusplus */
31  
32 #define CRC32_CCITT_SEED 0xFFFFFFFF
33 #define CRC32C_PRELOAD 0xffffffff
34 #define CRC32_MPEG2_SEED 0xFFFFFFFF
35  
36 /*
37 * Byte swap fix contributed by Dave Wysochanski <davidw@netapp.com>.
38 */
39 #define CRC32C_SWAP(crc32c_value) \
40 (((crc32c_value & 0xff000000) >> 24) | \
41 ((crc32c_value & 0x00ff0000) >> 8) | \
42 ((crc32c_value & 0x0000ff00) << 8) | \
43 ((crc32c_value & 0x000000ff) << 24))
44  
45 /** Lookup the crc value in the crc32_ccitt_table
46 @param pos Position in the table. */
47 WS_DLL_PUBLIC guint32 crc32_ccitt_table_lookup (guchar pos);
48  
49 /** Lookup the crc value in the crc32c_table
50 @param pos Position in the table. */
51 WS_DLL_PUBLIC guint32 crc32c_table_lookup (guchar pos);
52  
53 /** Compute CRC32C checksum of a buffer of data.
54 @param buf The buffer containing the data.
55 @param len The number of bytes to include in the computation.
56 @param crc The preload value for the CRC32C computation.
57 @return The CRC32C checksum. */
58 WS_DLL_PUBLIC guint32 crc32c_calculate(const void *buf, int len, guint32 crc);
59  
60 /** Compute CRC32C checksum of a buffer of data without swapping seed crc
61 or completed checksum
62 @param buf The buffer containing the data.
63 @param len The number of bytes to include in the computation.
64 @param crc The preload value for the CRC32C computation.
65 @return The CRC32C checksum. */
66 WS_DLL_PUBLIC guint32 crc32c_calculate_no_swap(const void *buf, int len, guint32 crc);
67  
68 /** Compute CRC32 CCITT checksum of a buffer of data.
69 @param buf The buffer containing the data.
70 @param len The number of bytes to include in the computation.
71 @return The CRC32 CCITT checksum. */
72 WS_DLL_PUBLIC guint32 crc32_ccitt(const guint8 *buf, guint len);
73  
74 /** Compute CRC32 CCITT checksum of a buffer of data. If computing the
75 * checksum over multiple buffers and you want to feed the partial CRC32
76 * back in, remember to take the 1's complement of the partial CRC32 first.
77 @param buf The buffer containing the data.
78 @param len The number of bytes to include in the computation.
79 @param seed The seed to use.
80 @return The CRC32 CCITT checksum (using the given seed). */
81 WS_DLL_PUBLIC guint32 crc32_ccitt_seed(const guint8 *buf, guint len, guint32 seed);
82  
83 /** Compute MPEG-2 CRC32 checksum of a buffer of data.
84 @param buf The buffer containing the data.
85 @param len The number of bytes to include in the computation.
86 @param seed The seed to use.
87 @return The CRC32 MPEG-2 checksum (using the given seed). */
88 WS_DLL_PUBLIC guint32 crc32_mpeg2_seed(const guint8 *buf, guint len, guint32 seed);
89  
90 /** Computes CRC32 checksum for the given data with the polynom 0x0AA725CF using
91 * precompiled CRC table
92 * @param buf a pointer to a buffer of the given length
93 * @param len the length of the given buffer
94 * @param seed The seed to use.
95 * @return the CRC32 checksum for the buffer
96 */
97 WS_DLL_PUBLIC guint32 crc32_0x0AA725CF_seed(const guint8 *buf, guint len, guint32 seed);
98  
99 WS_DLL_PUBLIC int AirPDcapWepDecrypt(
100 const guchar *seed,
101 const size_t seed_len,
102 guchar *cypher_text,
103 const size_t data_len);
104  
105 #ifdef __cplusplus
106 }
107 #endif /* __cplusplus */
108  
109 #endif /* crc32.h */