mirror of
https://github.com/opencv/opencv.git
synced 2024-12-17 10:58:00 +08:00
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
|
/* crc32_fold.c -- crc32 folding interface
|
||
|
|
* Copyright (C) 2021 Nathan Moinvaziri
|
||
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||
|
|
*/
|
||
|
|
#include "zbuild.h"
|
||
|
|
#include "functable.h"
|
||
|
|
|
||
|
|
#include "crc32_fold.h"
|
||
|
|
|
||
|
|
#include <limits.h>
|
||
|
|
|
||
|
|
Z_INTERNAL uint32_t crc32_fold_reset_c(crc32_fold *crc) {
|
||
|
|
crc->value = CRC32_INITIAL_VALUE;
|
||
|
|
return crc->value;
|
||
|
|
}
|
||
|
|
|
||
|
|
Z_INTERNAL void crc32_fold_copy_c(crc32_fold *crc, uint8_t *dst, const uint8_t *src, size_t len) {
|
||
|
|
crc->value = functable.crc32(crc->value, src, len);
|
||
|
|
memcpy(dst, src, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
Z_INTERNAL void crc32_fold_c(crc32_fold *crc, const uint8_t *src, size_t len, uint32_t init_crc) {
|
||
|
|
/* Note: while this is basically the same thing as the vanilla CRC function, we still need
|
||
|
|
* a functable entry for it so that we can generically dispatch to this function with the
|
||
|
|
* same arguments for the versions that _do_ do a folding CRC but we don't want a copy. The
|
||
|
|
* init_crc is an unused argument in this context */
|
||
|
|
Z_UNUSED(init_crc);
|
||
|
|
crc->value = functable.crc32(crc->value, src, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
Z_INTERNAL uint32_t crc32_fold_final_c(crc32_fold *crc) {
|
||
|
|
return crc->value;
|
||
|
|
}
|