(PNG) ublic static class Crc32
 (???) 
 (???)    public static uint HashToUInt32(byte[] source)
 (???)    {
 (???)        const uint polynomial = 0xEDB88320; // ISO-HDLC
 (???)        var crc = 0b11111111_11111111_11111111_11111111;
 (???)        foreach (var b in source)
 (???)        {
 (???)            crc ^= b;
 (???)            for (var bit = 0; bit < 8; bit++)
 (???)            {
 (???)                var lsb = crc & 1;
 (???)                var mask = lsb * polynomial;
 (???)                crc = (crc >> 1) ^ mask;
 (???)            }
 (???)        }
 (???)        return crc ^ 0b11111111_11111111_11111111_11111111;
 (???)    }
 (???)