1 /*****************************************************************************
2 
3 Copyright (c) 2011, 2011, Oracle and/or its affiliates. All Rights Reserved.
4 
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License, version 2.0,
7 as published by the Free Software Foundation.
8 
9 This program is also distributed with certain software (including
10 but not limited to OpenSSL) that is licensed under separate terms,
11 as designated in a particular file or component or in included license
12 documentation.  The authors of MySQL hereby grant you an additional
13 permission to link the program and your derivative works with the
14 separately licensed software that they have included with MySQL.
15 
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 GNU General Public License, version 2.0, for more details.
20 
21 You should have received a copy of the GNU General Public License along with
22 this program; if not, write to the Free Software Foundation, Inc.,
23 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
24 
25 *****************************************************************************/
26 
27 /**************************************************//**
28 @file include/ut0crc32.h
29 CRC32 implementation
30 
31 Created Aug 10, 2011 Vasil Dimov
32 *******************************************************/
33 
34 #ifndef ut0crc32_h
35 #define ut0crc32_h
36 
37 #include "univ.i"
38 
39 /********************************************************************//**
40 Initializes the data structures used by ut_crc32(). Does not do any
41 allocations, would not hurt if called twice, but would be pointless. */
42 UNIV_INTERN
43 void
44 ut_crc32_init();
45 /*===========*/
46 
47 /********************************************************************//**
48 Calculates CRC32.
49 @param ptr	- data over which to calculate CRC32.
50 @param len	- data length in bytes.
51 @return CRC32 (CRC-32C, using the GF(2) primitive polynomial 0x11EDC6F41,
52 or 0x1EDC6F41 without the high-order bit) */
53 typedef ib_uint32_t (*ib_ut_crc32_t)(const byte* ptr, ulint len);
54 
55 extern ib_ut_crc32_t	ut_crc32;
56 
57 extern bool	ut_crc32_sse2_enabled;
58 
59 #endif /* ut0crc32_h */
60