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7
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1 /**
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2 * utils.c:
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3 *
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4 * Useful utilities for general use.
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5 **/
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10
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6 #include "utils.h"
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7
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8 #include <sysinfoapi.h>
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7
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9 #include <stdint.h>
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10
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11 uint64_t get_system_time_in_milliseconds(void) {
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12 FILETIME ft;
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13 GetSystemTimeAsFileTime(&ft);
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14 uint64_t ul = (uint64_t) ft.dwHighDateTime << 32 | ft.dwLowDateTime;
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15 return ((ul - 116444736000000000ULL)/10000000);
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16 }
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17
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9
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18 uint32_t crc32b(unsigned char* restrict message) {
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19 int32_t i, j;
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20 uint32_t byte, crc, mask;
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7
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21
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22 crc = 0xFFFFFFFF;
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9
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23 for (i = 0; message[i] != 0; i++) {
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7
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24 byte = message[i]; // Get next byte.
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25 crc = crc ^ byte;
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26 for (j = 7; j >= 0; j--) { // Do eight times.
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27 mask = -(crc & 1);
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28 crc = (crc >> 1) ^ (0xEDB88320 & mask);
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29 }
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30 }
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31 return ~crc;
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32 }
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