diff options
Diffstat (limited to 'ubi-utils/src/crc32.h')
| -rw-r--r-- | ubi-utils/src/crc32.h | 47 |
1 files changed, 15 insertions, 32 deletions
diff --git a/ubi-utils/src/crc32.h b/ubi-utils/src/crc32.h index 31362b0..ee3145b 100644 --- a/ubi-utils/src/crc32.h +++ b/ubi-utils/src/crc32.h @@ -1,36 +1,19 @@ -#ifndef __CRC32_H__ -#define __CRC32_H__ -/* - * Copyright (c) International Business Machines Corp., 2006 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program 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 General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ +#ifndef CRC32_H +#define CRC32_H -/* - * Author: Thomas Gleixner - * - * CRC32 functions - * - * Can be compiled as seperate object, but is included into the ipl source - * so gcc can inline the functions. We optimize for size so the omission of - * the function frame is helpful. - * - */ #include <stdint.h> -void init_crc32_table(uint32_t *table); -uint32_t clc_crc32(uint32_t *table, uint32_t crc, void *buf, int len); +extern const uint32_t crc32_table[256]; -#endif /* __CRC32_H__ */ +/* Return a 32-bit CRC of the contents of the buffer. */ + + static inline uint32_t +crc32(uint32_t val, const void *ss, int len) +{ + const unsigned char *s = ss; + while (--len >= 0) + val = crc32_table[(val ^ *s++) & 0xff] ^ (val >> 8); + return val; +} + +#endif |