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comparison src/utils.c @ 7:be4835547dd0

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clean up code, convert git files to hg, etc.
author Paper
date Fri, 16 Dec 2022 20:35:06 -0500
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children 07f0e2f43204
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6:8ce85aee15c0 7:be4835547dd0
1 /**
2 * utils.c:
3 *
4 * Useful utilities for general use.
5 **/
6 #ifndef WIN32_LEAN_AND_MEAN
7 # define WIN32_LEAN_AND_MEAN
8 #endif
9 #include <windows.h>
10 #include <stdint.h>
11
12 uint64_t get_system_time_in_milliseconds(void) {
13 FILETIME ft;
14 GetSystemTimeAsFileTime(&ft);
15 uint64_t ul = (uint64_t) ft.dwHighDateTime << 32 | ft.dwLowDateTime;
16 return ((ul - 116444736000000000ULL)/10000000);
17 }
18
19 unsigned int crc32b(unsigned char *message) {
20 int i, j;
21 unsigned int byte, crc, mask;
22
23 i = 0;
24 crc = 0xFFFFFFFF;
25 while (message[i] != 0) {
26 byte = message[i]; // Get next byte.
27 crc = crc ^ byte;
28 for (j = 7; j >= 0; j--) { // Do eight times.
29 mask = -(crc & 1);
30 crc = (crc >> 1) ^ (0xEDB88320 & mask);
31 }
32 i = i + 1;
33 }
34 return ~crc;
35 }