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85923c8f30
Update zlib-ng to 2.2.1 #26113 Release: https://github.com/zlib-ng/zlib-ng/releases/tag/2.2.1 ARM diagnostics patch: https://github.com/zlib-ng/zlib-ng/pull/1774 ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [ ] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMake
70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
/* adler32.c -- compute the Adler-32 checksum of a data stream
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* Copyright (C) 1995-2011, 2016 Mark Adler
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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 "adler32_p.h"
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#ifdef ZLIB_COMPAT
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unsigned long Z_EXPORT PREFIX(adler32_z)(unsigned long adler, const unsigned char *buf, size_t len) {
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return (unsigned long)FUNCTABLE_CALL(adler32)((uint32_t)adler, buf, len);
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}
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#else
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uint32_t Z_EXPORT PREFIX(adler32_z)(uint32_t adler, const unsigned char *buf, size_t len) {
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return FUNCTABLE_CALL(adler32)(adler, buf, len);
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}
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#endif
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/* ========================================================================= */
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#ifdef ZLIB_COMPAT
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unsigned long Z_EXPORT PREFIX(adler32)(unsigned long adler, const unsigned char *buf, unsigned int len) {
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return (unsigned long)FUNCTABLE_CALL(adler32)((uint32_t)adler, buf, len);
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}
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#else
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uint32_t Z_EXPORT PREFIX(adler32)(uint32_t adler, const unsigned char *buf, uint32_t len) {
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return FUNCTABLE_CALL(adler32)(adler, buf, len);
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}
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#endif
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/* ========================================================================= */
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static uint32_t adler32_combine_(uint32_t adler1, uint32_t adler2, z_off64_t len2) {
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uint32_t sum1;
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uint32_t sum2;
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unsigned rem;
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/* for negative len, return invalid adler32 as a clue for debugging */
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if (len2 < 0)
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return 0xffffffff;
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/* the derivation of this formula is left as an exercise for the reader */
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len2 %= BASE; /* assumes len2 >= 0 */
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rem = (unsigned)len2;
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sum1 = adler1 & 0xffff;
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sum2 = rem * sum1;
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sum2 %= BASE;
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sum1 += (adler2 & 0xffff) + BASE - 1;
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sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
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if (sum1 >= BASE) sum1 -= BASE;
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if (sum1 >= BASE) sum1 -= BASE;
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if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);
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if (sum2 >= BASE) sum2 -= BASE;
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return sum1 | (sum2 << 16);
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}
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/* ========================================================================= */
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#ifdef ZLIB_COMPAT
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unsigned long Z_EXPORT PREFIX(adler32_combine)(unsigned long adler1, unsigned long adler2, z_off_t len2) {
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return (unsigned long)adler32_combine_((uint32_t)adler1, (uint32_t)adler2, len2);
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}
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unsigned long Z_EXPORT PREFIX4(adler32_combine)(unsigned long adler1, unsigned long adler2, z_off64_t len2) {
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return (unsigned long)adler32_combine_((uint32_t)adler1, (uint32_t)adler2, len2);
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}
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#else
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uint32_t Z_EXPORT PREFIX4(adler32_combine)(uint32_t adler1, uint32_t adler2, z_off64_t len2) {
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return adler32_combine_(adler1, adler2, len2);
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}
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#endif
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