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Matheus
47 lines
911 B
C
47 lines
911 B
C
#ifndef _UTIL_H
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#define _UTIL_H
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#include <stdint.h>
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#include <stddef.h>
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#define UTIL_ZEROBUFFERSIZE (1024 * 64)
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#define ROUND_DOWN(v, n) ((v) - ((v) % (n)))
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#define ROUND_UP(v, n) ROUND_DOWN((v) + (n) - 1, n)
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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static inline long abs(long x) {
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return x < 0 ? -x : x;
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}
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static inline unsigned long log2(unsigned long x) {
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return sizeof(unsigned long) * 8 - __builtin_clzll(x) - 1;
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}
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static inline long min(long x, long y) {
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return x > y ? y : x;
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}
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#define FNV1PRIME 0x100000001b3ull
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#define FNV1OFFSET 0xcbf29ce484222325ull
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// FNV-1a hash implementation
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static inline uint64_t fnv1ahash(void *buffer, size_t size) {
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uint8_t *ptr = buffer;
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uint8_t *top = ptr + size;
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uint64_t h = FNV1OFFSET;
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while (ptr < top) {
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h ^= *ptr++;
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h *= FNV1PRIME;
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}
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return h;
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}
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extern uint8_t util_zerobuffer[];
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#endif
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