1 files changed, 52 insertions, 0 deletions
diff --git a/Runtime/Utilities/CStringHash.h b/Runtime/Utilities/CStringHash.h
new file mode 100644
index 0000000..a4b58ef
--- /dev/null
+++ b/Runtime/Utilities/CStringHash.h
@@ -0,0 +1,52 @@
+#ifndef CSTRINGHASH_H
+#define CSTRINGHASH_H
+#include <functional>
+
+struct hash_cstring : std::unary_function<const char*, std::size_t>
+{
+	unsigned operator ()(const char* key) const
+	{
+		unsigned h = 0;
+		const unsigned sr = 8 * sizeof (unsigned) - 8;
+		const unsigned mask = 0xF << (sr + 4);
+		while (*key != '\0')
+		{
+			h = (h << 4) + *key;
+			std::size_t g = h & mask;
+			h ^= g | (g >> sr);
+			key++;
+		}
+		return h;
+	}
+};
+
+struct equal_cstring : std::binary_function<char*, char*, std::size_t>
+{
+	bool operator () (char* lhs, char* rhs) const
+	{
+		while (*lhs != '\0')
+		{
+			if (*lhs != *rhs)
+				return false;
+			lhs++; rhs++;
+		}
+		return *lhs == *rhs;
+	}
+};
+
+struct smaller_cstring : std::binary_function<const char*, const char*, std::size_t>
+{
+	bool operator () (const char* lhs, const char* rhs) const { return strcmp (lhs, rhs) < 0; }
+};
+
+struct compare_cstring : public std::binary_function<const char*, const char*, bool>
+{
+	bool operator ()(const char* lhs, const char* rhs) const { return strcmp (lhs, rhs) < 0; } 
+};
+
+struct compare_string_insensitive : public std::binary_function<const std::string, const std::string, bool>
+{
+	bool operator ()(const std::string& lhs, const std::string& rhs) const { return StrICmp (lhs, rhs) < 0; } 
+};
+
+#endif