Moving byte order/memory access to poly.

src/poly/byte_order.h

@@ -0,0 +1,61 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef POLY_BYTE_ORDER_H_
+#define POLY_BYTE_ORDER_H_
+
+#include <cstdint>
+
+#include <poly/config.h>
+#include <poly/platform.h>
+
+#if XE_LIKE_OSX
+#include <libkern/OSByteOrder.h>
+#endif  // XE_LIKE_OSX
+
+namespace poly {
+
+#if XE_COMPILER_MSVC
+#define POLY_BYTE_SWAP_16 _byteswap_ushort
+#define POLY_BYTE_SWAP_32 _byteswap_ulong
+#define POLY_BYTE_SWAP_64 _byteswap_uint64
+#elif XE_LIKE_OSX
+#define POLY_BYTE_SWAP_16 OSSwapInt16
+#define POLY_BYTE_SWAP_32 OSSwapInt32
+#define POLY_BYTE_SWAP_64 OSSwapInt64
+#else
+#define POLY_BYTE_SWAP_16 __bswap_16
+#define POLY_BYTE_SWAP_32 __bswap_32
+#define POLY_BYTE_SWAP_64 __bswap_64
+#endif  // XE_COMPILER_MSVC
+
+inline int16_t byte_swap(int16_t value) {
+  return static_cast<int16_t>(POLY_BYTE_SWAP_16(static_cast<int16_t>(value)));
+}
+inline uint16_t byte_swap(uint16_t value) { return POLY_BYTE_SWAP_16(value); }
+inline int32_t byte_swap(int32_t value) {
+  return static_cast<int32_t>(POLY_BYTE_SWAP_32(static_cast<int32_t>(value)));
+}
+inline uint32_t byte_swap(uint32_t value) { return POLY_BYTE_SWAP_32(value); }
+inline int64_t byte_swap(int64_t value) {
+  return static_cast<int64_t>(POLY_BYTE_SWAP_64(static_cast<int64_t>(value)));
+}
+inline uint64_t byte_swap(uint64_t value) { return POLY_BYTE_SWAP_64(value); }
+inline float byte_swap(float value) {
+  uint32_t temp = byte_swap(*reinterpret_cast<uint32_t *>(&value));
+  return *reinterpret_cast<float *>(&temp);
+}
+inline double byte_swap(double value) {
+  uint64_t temp = byte_swap(*reinterpret_cast<uint64_t *>(&value));
+  return *reinterpret_cast<double *>(&temp);
+}
+
+}  // namespace poly
+
+#endif  // POLY_BYTE_ORDER_H_