bits.c revision 02c335c23bf5fa225a467c19f2c063fb0dc7b8c3
/* Copyright (c) 2001-2016 Dovecot authors, see the included COPYING file */
#include "lib.h"
size_t nearest_power(size_t num)
{
size_t n = 1;
i_assert(num <= ((size_t)1 << (CHAR_BIT*sizeof(size_t) - 1)));
while (n < num) n <<= 1;
return n;
}
unsigned int bits_required8(uint8_t num)
{
int ret = 0;
if (num > 0xf) { ret += 4; num >>= 4; }
if (num > 0x3) { ret += 2; num >>= 2; }
num &= ~(num>>1); /* 3->2, else unchanged */
return ret + num;
}