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using System;
namespace Ionic.Zlib
{
public sealed class Adler
{
private static readonly uint BASE = 65521u;
private static readonly int NMAX = 5552;
public static uint Adler32(uint adler, byte[] buf, int index, int len)
{
bool flag = buf == null;
uint result;
if (flag)
{
result = 1u;
}
else
{
uint num = adler & 65535u;
uint num2 = adler >> 16 & 65535u;
while (len > 0)
{
int i = (len < Adler.NMAX) ? len : Adler.NMAX;
len -= i;
while (i >= 16)
{
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
num += (uint)buf[index++];
num2 += num;
i -= 16;
}
bool flag2 = i != 0;
if (flag2)
{
do
{
num += (uint)buf[index++];
num2 += num;
}
while (--i != 0);
}
num %= Adler.BASE;
num2 %= Adler.BASE;
}
result = (num2 << 16 | num);
}
return result;
}
}
}
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