mirror of
https://github.com/TheAlgorithms/C
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ff2e7a3528
* added hash folder to CMAKE build
* split sdbm code from hash.c to independent program
* update readme file
* docs + vartype fix
* split djb2 code from hash.c to independent program
* fix function reference
* split xor8 code from hash.c to independent program
* split adler32 code from hash.c to independent program
* remove additional author
* split crc32 code from hash.c to independent program
* remove redundant files
* interpret large numbers as specific types
* disable eror clang-diagnostic-implicitly-unsigned-literal
* force use constants
* updating DIRECTORY.md
* clang-tidy fixes for 606e5d4fce
* added return in function doc to enable doc
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/**
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* @addtogroup hash Hash algorithms
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* @{
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* @file hash_crc32.c
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* @author [Christian Bender](https://github.com/christianbender)
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* @brief 32-bit [CRC
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* hash](https://en.wikipedia.org/wiki/Cyclic_redundancy_check#CRC-32_algorithm)
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* algorithm
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*/
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#include <assert.h>
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#include <inttypes.h>
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#include <stdio.h>
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/**
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* @brief 32-bit CRC algorithm implementation
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*
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* @param s NULL terminated ASCII string to hash
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* @return 32-bit hash result
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*/
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uint32_t crc32(const char* s)
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{
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uint32_t crc = 0xffffffff;
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size_t i = 0;
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while (s[i] != '\0')
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{
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uint8_t byte = s[i];
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crc = crc ^ byte;
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for (uint8_t j = 8; j > 0; --j)
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{
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crc = (crc >> 1) ^ (0xEDB88320 & (-(crc & 1)));
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}
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i++;
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}
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return crc ^ 0xffffffff;
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}
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/**
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* @brief Test function for ::crc32
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* \returns None
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*/
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void test_crc32()
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{
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assert(crc32("Hello World") == 1243066710);
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assert(crc32("Hello World!") == 472456355);
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assert(crc32("Hello world") == 2346098258);
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assert(crc32("Hello world!") == 461707669);
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// printf("%" PRIu32 "\n", crc32("Hello World"));
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// printf("%" PRIu32 "\n", crc32("Hello World!"));
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// printf("%" PRIu32 "\n", crc32("Hello world"));
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// printf("%" PRIX32 "\n", crc32("Hello world!"));
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printf("Tests passed\n");
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}
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/** @} */
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/** Main function */
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int main()
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{
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test_crc32();
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return 0;
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}
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