Fuck git

external/parallel-rdp/parallel-rdp-standalone/util/hash.hpp

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+/* Copyright (c) 2017-2023 Hans-Kristian Arntzen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+#include <stdint.h>
+#include <string>
+
+namespace Util
+{
+using Hash = uint64_t;
+
+class Hasher
+{
+public:
+	explicit Hasher(Hash h_)
+		: h(h_)
+	{
+	}
+
+	Hasher() = default;
+
+	template <typename T>
+	inline void data(const T *data_, size_t size)
+	{
+		size /= sizeof(*data_);
+		for (size_t i = 0; i < size; i++)
+			h = (h * 0x100000001b3ull) ^ data_[i];
+	}
+
+	inline void u32(uint32_t value)
+	{
+		h = (h * 0x100000001b3ull) ^ value;
+	}
+
+	inline void s32(int32_t value)
+	{
+		u32(uint32_t(value));
+	}
+
+	inline void f32(float value)
+	{
+		union
+		{
+			float f32;
+			uint32_t u32;
+		} u;
+		u.f32 = value;
+		u32(u.u32);
+	}
+
+	inline void u64(uint64_t value)
+	{
+		u32(value & 0xffffffffu);
+		u32(value >> 32);
+	}
+
+	template <typename T>
+	inline void pointer(T *ptr)
+	{
+		u64(reinterpret_cast<uintptr_t>(ptr));
+	}
+
+	inline void string(const char *str)
+	{
+		char c;
+		u32(0xff);
+		while ((c = *str++) != '\0')
+			u32(uint8_t(c));
+	}
+
+	inline void string(const std::string &str)
+	{
+		u32(0xff);
+		for (auto &c : str)
+			u32(uint8_t(c));
+	}
+
+	inline Hash get() const
+	{
+		return h;
+	}
+
+private:
+	Hash h = 0xcbf29ce484222325ull;
+};
+}