| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */ |
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| 3 | /* Usage example: |
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| 4 | $ ./crc32hash "Dual Speed" |
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| 5 | */ |
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| 6 | |
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| 7 | #include <string.h> |
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| 8 | #include <stdio.h> |
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| 9 | #include <ctype.h> |
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| 10 | #include <stdlib.h> |
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| 11 | |
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| 12 | static unsigned int crc32(unsigned char const *p, unsigned int len) |
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| 13 | { |
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| 14 | int i; |
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| 15 | unsigned int crc = 0; |
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| 16 | while (len--) { |
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| 17 | crc ^= *p++; |
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| 18 | for (i = 0; i < 8; i++) |
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| 19 | crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0); |
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| 20 | } |
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| 21 | return crc; |
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| 22 | } |
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| 23 | |
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| 24 | int main(int argc, char **argv) { |
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| 25 | unsigned int result; |
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| 26 | if (argc != 2) { |
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| 27 | printf("no string passed as argument\n" ); |
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| 28 | return -1; |
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| 29 | } |
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| 30 | result = crc32(p: (unsigned char const *)argv[1], len: strlen(argv[1])); |
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| 31 | printf("0x%x\n" , result); |
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| 32 | return 0; |
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| 33 | } |
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| 34 | |
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