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arookas · Mar 14, 2016 · 17c3145 · 17c3145
1 parent e8fe454
commit 17c3145
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diff --git a/jmpman/hash.cs b/jmpman/hash.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Text;
+
+namespace arookas {
+	static class hash {
+		public static uint calculate(string data) {
+			if (data == null) {
+				throw new ArgumentNullException("data");
+			}
+			return calculate(Encoding.ASCII.GetBytes(data));
+		}
+		public static uint calculate(byte[] data) {
+			if (data == null) {
+				throw new ArgumentNullException("data");
+			}
+			// this code is so shitty
+			var hash = 0u;
+			for (var i = 0; i < data.Length; ++i) {
+				hash <<= 8;
+				hash += data[i];
+				var r6 = unchecked((uint)((4993ul * hash) >> 32));
+				var r0 = unchecked((byte)((((hash - r6) / 2) + r6) >> 24));
+				hash -= r0 * 33554393u;
+			}
+			return hash;
+		}
+	}
+}