ref: fcc77109aec85decb2ec7e7c41af203b4ae0f12f
dir: /libc/adler32.c/
#include <u.h>
#include <libc.h>
long
adler32(char *data)
{
const int prime = 65521;
int i = 0;
int a = 0, b = 1;
while (i < strlen(data))
{
b += data[i];
a += b;
i++;
}
b = b % prime;
a = a % prime;
return(b << 16 | a);
}