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0de26fd78e
Zlib-ng is zlib replacement with optimizations for "next generation" systems. Its optimization may benifits image library decode and encode speed such as libpng. In our tests, if using zlib-ng and libpng combination on a x86_64 machine with AVX2, the time of `imdecode` amd `imencode` will drop 20% approximately. This patch enables zlib-ng's optimization if `CV_DISABLE_OPTIMIZATION` is OFF. Since Zlib-ng can dispatch intrinsics on the fly, port work is much easier. Related discussion: https://github.com/opencv/opencv/issues/22573
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
/* crc32_fold.c -- crc32 folding interface
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* Copyright (C) 2021 Nathan Moinvaziri
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#include "zbuild.h"
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#include "functable.h"
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#include "crc32_fold.h"
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#include <limits.h>
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Z_INTERNAL uint32_t crc32_fold_reset_c(crc32_fold *crc) {
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crc->value = CRC32_INITIAL_VALUE;
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return crc->value;
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}
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Z_INTERNAL void crc32_fold_copy_c(crc32_fold *crc, uint8_t *dst, const uint8_t *src, size_t len) {
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crc->value = functable.crc32(crc->value, src, len);
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memcpy(dst, src, len);
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}
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Z_INTERNAL void crc32_fold_c(crc32_fold *crc, const uint8_t *src, size_t len, uint32_t init_crc) {
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/* Note: while this is basically the same thing as the vanilla CRC function, we still need
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* a functable entry for it so that we can generically dispatch to this function with the
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* same arguments for the versions that _do_ do a folding CRC but we don't want a copy. The
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* init_crc is an unused argument in this context */
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Z_UNUSED(init_crc);
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crc->value = functable.crc32(crc->value, src, len);
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}
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Z_INTERNAL uint32_t crc32_fold_final_c(crc32_fold *crc) {
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return crc->value;
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}
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