| 1 |
#ifndef __CRC32_H__ |
| 2 |
#define __CRC32_H__ |
| 3 |
|
| 4 |
#include "ecb.h" |
| 5 |
#include "uuint.h" |
| 6 |
|
| 7 |
#ifdef __cplusplus |
| 8 |
extern "C" { |
| 9 |
#endif |
| 10 |
|
| 11 |
typedef uint32_t crc32_t; |
| 12 |
|
| 13 |
#define CRC32_INIT ((crc32_t)0) |
| 14 |
|
| 15 |
/* |
| 16 |
* Update a running crc with the bytes buf[0..len-1] and return the updated |
| 17 |
* crc. If buf is NULL, this function returns the required initial value |
| 18 |
* for the crc. Pre- and post-conditioning (one's complement) is performed |
| 19 |
* within this function so it shouldn't be done by the application. |
| 20 |
* Usage example: |
| 21 |
* |
| 22 |
* uLong crc = CRC32_INIT; |
| 23 |
* |
| 24 |
* while (read_buffer (buffer, length) != EOF) { |
| 25 |
* crc = crc32 (crc, buffer, length); |
| 26 |
* } |
| 27 |
* if (crc != original_crc) error (); |
| 28 |
*/ |
| 29 |
UULIBINT_FUNC crc32_t uu_crc32 (crc32_t prev, const void *data, unsigned int len); |
| 30 |
|
| 31 |
/* |
| 32 |
* This calculates the crc of a block of data consisting of two |
| 33 |
* parts, using only their CRCs. This is used to quickly combine |
| 34 |
* part CRCs into a full file CRC. |
| 35 |
*/ |
| 36 |
UULIBINT_FUNC uint32_t uu_crc32_combine (uint32_t crcA, uint32_t crcB, size_t lengthB); |
| 37 |
|
| 38 |
#ifdef __cplusplus |
| 39 |
} |
| 40 |
#endif |
| 41 |
#endif |
