tl-parser/crc32.h
2014-11-12 14:23:25 +03:00

60 lines
2.1 KiB
C

/*
This file is part of VK/KittenPHP-DB-Engine Library.
VK/KittenPHP-DB-Engine Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
VK/KittenPHP-DB-Engine Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with VK/KittenPHP-DB-Engine Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009-2012 Vkontakte Ltd
2009-2012 Nikolai Durov
2009-2012 Andrei Lopatin
2012 Anton Maydell
*/
#ifndef __CRC32_H__
#define __CRC32_H__
#ifdef __cplusplus
extern "C" {
#endif
extern unsigned int crc32_table[256];
unsigned crc32_partial (const void *data, int len, unsigned crc);
//unsigned crc32_partial_fast (const void *data, int len, unsigned crc);
//unsigned crc32_partial_fastest (const void *data, int len, unsigned crc);
unsigned compute_crc32 (const void *data, int len);
unsigned compute_crc32_combine (unsigned crc1, unsigned crc2, int len2);
extern unsigned long long crc64_table[256];
unsigned long long crc64_partial (const void *data, int len, unsigned long long crc);
unsigned long long crc64 (const void *data, int len);
//unsigned gf32_matrix_times (unsigned *matrix, unsigned vector);
/* crc32_check_and_repair returns
0 : Cyclic redundancy check is ok
1 : Cyclic redundancy check fails, but we fix one bit in input
2 : Cyclic redundancy check fails, but we fix one bit in input_crc32
-1 : Cyclic redundancy check fails, no repair possible.
In this case *input_crc32 will be equal crc32 (input, l)
Case force_exit == 1 (case 1, 2: kprintf call, case -1: assert fail).
*/
int crc32_check_and_repair (void *input, int l, unsigned *input_crc32, int force_exit);
#ifdef __cplusplus
}
#endif
#endif