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Add mg_crc32

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This commit is contained in:
cpq 2021-03-08 15:40:39 +00:00
parent 060bb29cdc
commit d50dc288cd
2 changed files with 11 additions and 0 deletions
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10
src/util.c
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@ -273,6 +273,16 @@ int64_t mg_to64(struct mg_str str) {
return result * neg; return result * neg;
} }
uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len) {
int i;
crc = ~crc;
while (len--) {
crc ^= *(unsigned char *) buf++;
for (i = 0; i < 8; i++) crc = crc & 1 ? (crc >> 1) ^ 0xedb88320 : crc >> 1;
}
return ~crc;
}
double mg_time(void) { double mg_time(void) {
#if MG_ARCH == MG_ARCH_WIN32 #if MG_ARCH == MG_ARCH_WIN32
SYSTEMTIME sysnow; SYSTEMTIME sysnow;

1
src/util.h
View File

@ -12,6 +12,7 @@ bool mg_globmatch(const char *pattern, int plen, const char *s, int n);
bool mg_next_comma_entry(struct mg_str *s, struct mg_str *k, struct mg_str *v); bool mg_next_comma_entry(struct mg_str *s, struct mg_str *k, struct mg_str *v);
uint16_t mg_ntohs(uint16_t net); uint16_t mg_ntohs(uint16_t net);
uint32_t mg_ntohl(uint32_t net); uint32_t mg_ntohl(uint32_t net);
uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len);
char *mg_hexdump(const void *buf, size_t len); char *mg_hexdump(const void *buf, size_t len);
char *mg_hex(const void *buf, int len, char *dst); char *mg_hex(const void *buf, int len, char *dst);
void mg_unhex(const char *buf, int len, unsigned char *to); void mg_unhex(const char *buf, int len, unsigned char *to);