1 files changed, 161 insertions, 0 deletions
diff --git a/ZAPD/Utils/BitConverter.h b/ZAPD/Utils/BitConverter.h
new file mode 100644
index 0000000..5cca35b
--- /dev/null
+++ b/ZAPD/Utils/BitConverter.h
@@ -0,0 +1,161 @@
+#pragma once
+
+#include <limits>
+#include <stdint.h>
+#include <vector>
+
+class BitConverter
+{
+public:
+	static inline int8_t ToInt8BE(const uint8_t* data, int32_t offset)
+	{
+		return (uint8_t)data[offset + 0];
+	}
+
+	static inline int8_t ToInt8BE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		return (uint8_t)data[offset + 0];
+	}
+
+	static inline uint8_t ToUInt8BE(const uint8_t* data, int32_t offset)
+	{
+		return (uint8_t)data[offset + 0];
+	}
+
+	static inline uint8_t ToUInt8BE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		return (uint8_t)data[offset + 0];
+	}
+
+	static inline int16_t ToInt16BE(const uint8_t* data, int32_t offset)
+	{
+		return ((uint16_t)data[offset + 0] << 8) + (uint16_t)data[offset + 1];
+	}
+
+	static inline int16_t ToInt16BE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		return ((uint16_t)data[offset + 0] << 8) + (uint16_t)data[offset + 1];
+	}
+
+	static inline uint16_t ToUInt16BE(const uint8_t* data, int32_t offset)
+	{
+		return ((uint16_t)data[offset + 0] << 8) + (uint16_t)data[offset + 1];
+	}
+
+	static inline uint16_t ToUInt16BE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		return ((uint16_t)data[offset + 0] << 8) + (uint16_t)data[offset + 1];
+	}
+
+	static inline int32_t ToInt32BE(const uint8_t* data, int32_t offset)
+	{
+		return ((uint32_t)data[offset + 0] << 24) + ((uint32_t)data[offset + 1] << 16) +
+			   ((uint32_t)data[offset + 2] << 8) + (uint32_t)data[offset + 3];
+	}
+
+	static inline int32_t ToInt32BE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		return ((uint32_t)data[offset + 0] << 24) + ((uint32_t)data[offset + 1] << 16) +
+			   ((uint32_t)data[offset + 2] << 8) + (uint32_t)data[offset + 3];
+	}
+
+	static inline uint32_t ToUInt32BE(const uint8_t* data, int32_t offset)
+	{
+		return ((uint32_t)data[offset + 0] << 24) + ((uint32_t)data[offset + 1] << 16) +
+			   ((uint32_t)data[offset + 2] << 8) + (uint32_t)data[offset + 3];
+	}
+
+	static inline uint32_t ToUInt32BE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		return ((uint32_t)data[offset + 0] << 24) + ((uint32_t)data[offset + 1] << 16) +
+			   ((uint32_t)data[offset + 2] << 8) + (uint32_t)data[offset + 3];
+	}
+
+	static inline int64_t ToInt64BE(const uint8_t* data, int32_t offset)
+	{
+		return ((uint64_t)data[offset + 0] << 56) + ((uint64_t)data[offset + 1] << 48) +
+			   ((uint64_t)data[offset + 2] << 40) + ((uint64_t)data[offset + 3] << 32) +
+			   ((uint64_t)data[offset + 4] << 24) + ((uint64_t)data[offset + 5] << 16) +
+			   ((uint64_t)data[offset + 6] << 8) + ((uint64_t)data[offset + 7]);
+	}
+
+	static inline int64_t ToInt64BE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		return ((uint64_t)data[offset + 0] << 56) + ((uint64_t)data[offset + 1] << 48) +
+			   ((uint64_t)data[offset + 2] << 40) + ((uint64_t)data[offset + 3] << 32) +
+			   ((uint64_t)data[offset + 4] << 24) + ((uint64_t)data[offset + 5] << 16) +
+			   ((uint64_t)data[offset + 6] << 8) + ((uint64_t)data[offset + 7]);
+	}
+
+	static inline uint64_t ToUInt64BE(const uint8_t* data, int32_t offset)
+	{
+		return ((uint64_t)data[offset + 0] << 56) + ((uint64_t)data[offset + 1] << 48) +
+			   ((uint64_t)data[offset + 2] << 40) + ((uint64_t)data[offset + 3] << 32) +
+			   ((uint64_t)data[offset + 4] << 24) + ((uint64_t)data[offset + 5] << 16) +
+			   ((uint64_t)data[offset + 6] << 8) + ((uint64_t)data[offset + 7]);
+	}
+
+	static inline uint64_t ToUInt64BE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		return ((uint64_t)data[offset + 0] << 56) + ((uint64_t)data[offset + 1] << 48) +
+			   ((uint64_t)data[offset + 2] << 40) + ((uint64_t)data[offset + 3] << 32) +
+			   ((uint64_t)data[offset + 4] << 24) + ((uint64_t)data[offset + 5] << 16) +
+			   ((uint64_t)data[offset + 6] << 8) + ((uint64_t)data[offset + 7]);
+	}
+
+	static inline float ToFloatBE(const uint8_t* data, int32_t offset)
+	{
+		float value;
+		uint32_t floatData = ((uint32_t)data[offset + 0] << 24) +
+							 ((uint32_t)data[offset + 1] << 16) +
+							 ((uint32_t)data[offset + 2] << 8) + (uint32_t)data[offset + 3];
+		static_assert(sizeof(uint32_t) == sizeof(float), "expected 32-bit float");
+		std::memcpy(&value, &floatData, sizeof(value));
+		return value;
+	}
+
+	static inline float ToFloatBE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		float value;
+		uint32_t floatData = ((uint32_t)data[offset + 0] << 24) +
+							 ((uint32_t)data[offset + 1] << 16) +
+							 ((uint32_t)data[offset + 2] << 8) + (uint32_t)data[offset + 3];
+		static_assert(sizeof(uint32_t) == sizeof(float), "expected 32-bit float");
+		std::memcpy(&value, &floatData, sizeof(value));
+		return value;
+	}
+
+	static inline double ToDoubleBE(const uint8_t* data, int32_t offset)
+	{
+		double value;
+		uint64_t floatData =
+			((uint64_t)data[offset + 0] << 56) + ((uint64_t)data[offset + 1] << 48) +
+			((uint64_t)data[offset + 2] << 40) + ((uint64_t)data[offset + 3] << 32) +
+			((uint64_t)data[offset + 4] << 24) + ((uint64_t)data[offset + 5] << 16) +
+			((uint64_t)data[offset + 6] << 8) + ((uint64_t)data[offset + 7]);
+		static_assert(sizeof(uint64_t) == sizeof(double), "expected 64-bit double");
+		// Checks if the float format on the platform the ZAPD binary is running on supports the
+		// same float format as the object file.
+		static_assert(std::numeric_limits<float>::is_iec559,
+		              "expected IEC559 floats on host machine");
+		std::memcpy(&value, &floatData, sizeof(value));
+		return value;
+	}
+
+	static inline double ToDoubleBE(const std::vector<uint8_t>& data, int32_t offset)
+	{
+		double value;
+		uint64_t floatData =
+			((uint64_t)data[offset + 0] << 56) + ((uint64_t)data[offset + 1] << 48) +
+			((uint64_t)data[offset + 2] << 40) + ((uint64_t)data[offset + 3] << 32) +
+			((uint64_t)data[offset + 4] << 24) + ((uint64_t)data[offset + 5] << 16) +
+			((uint64_t)data[offset + 6] << 8) + ((uint64_t)data[offset + 7]);
+		static_assert(sizeof(uint64_t) == sizeof(double), "expected 64-bit double");
+		// Checks if the float format on the platform the ZAPD binary is running on supports the
+		// same float format as the object file.
+		static_assert(std::numeric_limits<double>::is_iec559,
+		              "expected IEC559 doubles on host machine");
+		std::memcpy(&value, &floatData, sizeof(value));
+		return value;
+	}
+};