#include "util/adler32.h"

#define BASE 65521

uint32_t util_adler32_calc(uint32_t initval, const uint8_t* input, size_t length)
{
    unsigned int s1 = initval & 0xffff;
    unsigned int s2 = (initval >> 16) & 0xffff;
    unsigned int n;

    for (n = 0; n < length; n++) {
        s1 = (s1 + input[n]) % BASE;
	    s2 = (s2 + s1) % BASE;
    }

    return (s2 << 16) + s1;
}