Initial commit

src/common/platform/sysSwapByteOrder.h

@@ -0,0 +1,53 @@
+#ifndef KYTY_COMMON_PLATFORM_SYSSWAPBYTEORDER_H_
+#define KYTY_COMMON_PLATFORM_SYSSWAPBYTEORDER_H_
+
+#include "common/common.h"
+
+#include <type_traits>
+
+inline uint16_t SwapByteOrder16(uint16_t value) {
+	uint16_t hi = value << 8u;
+	uint16_t lo = value >> 8u;
+	return hi | lo;
+}
+
+inline uint32_t SwapByteOrder32(uint32_t value) {
+	return __builtin_bswap32(value);
+}
+
+inline uint64_t SwapByteOrder64(uint64_t value) {
+	return __builtin_bswap64(value);
+}
+
+template <typename T>
+inline void SwapByteOrder(T& x) {
+	if (sizeof(x) == 2) {
+		if (std::is_signed_v<T>) {
+			x = static_cast<std::make_signed_t<T>>(
+			    SwapByteOrder16(static_cast<std::make_unsigned_t<uint16_t>>(x)));
+		} else {
+			x = SwapByteOrder16(x);
+		}
+	}
+	if (sizeof(x) == 4) {
+		if (std::is_signed_v<T>) {
+			x = static_cast<std::make_signed_t<T>>(
+			    SwapByteOrder32(static_cast<std::make_unsigned_t<uint32_t>>(x)));
+		} else {
+			x = SwapByteOrder32(x);
+		}
+	}
+	if (sizeof(x) == 8) {
+		if (std::is_signed_v<T>) {
+			x = static_cast<std::make_signed_t<T>>(
+			    SwapByteOrder64(static_cast<std::make_unsigned_t<uint64_t>>(x)));
+		} else {
+			x = SwapByteOrder64(x);
+		}
+	}
+}
+
+template <typename T>
+inline void NoSwapByteOrder(T& x) {}
+
+#endif /* KYTY_COMMON_PLATFORM_SYSSWAPBYTEORDER_H_ */