GEEKING

App/util/Hash.cpp

@@ -0,0 +1,40 @@
+#include "Util/Hash.h"
+
+namespace RBX {
+
+	unsigned int Hash::hash(const void* data, size_t bytes) 
+	{
+		unsigned int answer = 0;
+		hashAppend(answer, data, bytes);
+		return answer;
+	};
+
+
+	void Hash::hashAppend(unsigned int& currentHash, const void* data, size_t bytes)
+	{
+		const unsigned char* charArray = static_cast<const unsigned char*>(data);
+		unsigned int b = 378551;
+		unsigned int a = 63689;
+
+		for(unsigned int i = 0; i < bytes; i++)
+		{
+			currentHash = currentHash*a + charArray[i];
+			a = a*b;
+		}
+
+		currentHash = currentHash & 0x7FFFFFFF;
+	}
+
+	void Hash::hashAppend(unsigned int& currentHash, unsigned int append)
+	{
+		hashAppend(currentHash, &append, 4);
+	}
+
+
+	unsigned int Hash::hash(const std::string& str)
+	{
+		return hash(&str[0], str.length());
+	};
+
+
+} // namespace