mirror of
https://github.com/jb55/nostril.git
synced 2024-11-24 00:49:07 -05:00
27 lines
392 B
C
27 lines
392 B
C
static inline int zero_bits(unsigned char b)
|
|
{
|
|
int n = 0;
|
|
|
|
if (b == 0)
|
|
return 8;
|
|
|
|
while (b >>= 1)
|
|
n++;
|
|
|
|
return 7-n;
|
|
}
|
|
|
|
/* find the number of leading zero bits in a hash */
|
|
static int count_leading_zero_bits(unsigned char *hash)
|
|
{
|
|
int bits, total, i;
|
|
|
|
for (i = 0, total = 0; i < 32; i++) {
|
|
bits = zero_bits(hash[i]);
|
|
total += bits;
|
|
if (bits != 8)
|
|
break;
|
|
}
|
|
return total;
|
|
}
|