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public static class GooglePageRank { private static void Mix(ref uint a, ref uint b, ref uint c) { a -= b; a -= c; a ^= c >> 13; b -= c; b -= a; b ^= a << 8; c -= a; c -= b; c ^= b >> 13; a -= b; a -= c; a ^= c >> 12; b -= c; b -= a; b ^= a << 16; c -= a; c -= b; c ^= b >> 5; a -= b; a -= c; a ^= c >> 3; b -= c; b -= a; b ^= a << 10; c -= a; c -= b; c ^= b >> 15; } private static string GoogleChecksum(string url) { uint GoogleMagic = 0xE6359A60; uint a, b; uint c = GoogleMagic; a = b = 0x9E3779B9; int k = 0; int length = url.Length; //Algorithm while (length >= 12) { a += (uint)(url[k + 0] + (url[k + 1] << 8) + (url[k + 2] << 16) + (url[k + 3] << 24)); b += (uint)(url[k + 4] + (url[k + 5] << 8) + (url[k + 6] << 16) + (url[k + 7] << 24)); c += (uint)(url[k + 8] + (url[k + 9] << 8) + (url[k + 10] << 16) + (url[k + 11] << 24)); Mix(ref a, ref b, ref c); k += 12; length -= 12; } c += (uint)url.Length; //All cases fall through switch (length) { case 11: c += (uint)(url[k + 10] << 24); goto case 10; //fall through case 10: c += (uint)(url[k + 9] << 16); goto case 9; case 9: c += (uint)(url[k + 8] << 8); goto case 8; case 8: b += (uint)(url[k + 7] << 24); goto case 7; case 7: b += (uint)(url[k + 6] << 16); goto case 6; case 6: b += (uint)(url[k + 5] << 8); goto case 5; case 5: b += (uint)(url[k + 4]); goto case 4; case 4: a += (uint)(url[k + 3] << 24); goto case 3; case 3: a += (uint)(url[k + 2] << 16); goto case 2; case 2: a += (uint)(url[k + 1] << 8); goto case 1; case 1: a += (uint)(url[k + 0]); break; default: break; } Mix(ref a, ref b, ref c); return string.Format("6{0}", c); } public static int getPageRank(string url) { //Calculate URL checksum string checkSum = GoogleChecksum("info:" + url); string file = "http://toolbarqueries.google.com/search?client=navclient-auto&ch=" + checkSum + "&features=Rank&q=info:" + url; try { //Request PR from Google WebRequest request = WebRequest.Create(file); WebResponse response = request.GetResponse(); string data = reader.ReadToEnd(); reader.Close(); response.Close(); //Parse PR from string int pageRank = -1; if (data.IndexOf(':') != -1) { data = data.Substring(data.LastIndexOf(':') + 1); } int.TryParse(data, out pageRank); return pageRank; } catch (Exception) { return -1; } } }
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