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+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2011 - All Rights Reserved
+ *
+ */
+
+#ifndef __LESWAPS_H
+#define __LESWAPS_H
+
+#include "LETypes.h"
+
+/**
+ * \file
+ * \brief C++ API: Endian independent access to data for LayoutEngine
+ */
+
+U_NAMESPACE_BEGIN
+
+/**
+ * A convenience macro which invokes the swapWord member function
+ * from a concise call.
+ *
+ * @stable ICU 2.8
+ */
+#define SWAPW(value) LESwaps::swapWord((le_uint16)(value))
+
+/**
+ * A convenience macro which invokes the swapLong member function
+ * from a concise call.
+ *
+ * @stable ICU 2.8
+ */
+#define SWAPL(value) LESwaps::swapLong((le_uint32)(value))
+
+/**
+ * This class is used to access data which stored in big endian order
+ * regardless of the conventions of the platform.
+ *
+ * All methods are static and inline in an attempt to induce the compiler
+ * to do most of the calculations at compile time.
+ *
+ * @stable ICU 2.8
+ */
+class U_LAYOUT_API LESwaps /* not : public UObject because all methods are static */ {
+public:
+
+ /**
+ * Reads a big-endian 16-bit word and returns a native-endian value.
+ * No-op on a big-endian platform, byte-swaps on a little-endian platform.
+ *
+ * @param value - the word to be byte swapped
+ *
+ * @return the byte swapped word
+ *
+ * @stable ICU 2.8
+ */
+ static le_uint16 swapWord(le_uint16 value)
+ {
+#if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || defined(__BIG_ENDIAN__)
+ // Fastpath when we know that the platform is big-endian.
+ return value;
+#else
+ // Reads a big-endian value on any platform.
+ const le_uint8 *p = reinterpret_cast<const le_uint8 *>(&value);
+ return (le_uint16)((p[0] << 8) | p[1]);
+#endif
+ };
+
+ /**
+ * Reads a big-endian 32-bit word and returns a native-endian value.
+ * No-op on a big-endian platform, byte-swaps on a little-endian platform.
+ *
+ * @param value - the long to be byte swapped
+ *
+ * @return the byte swapped long
+ *
+ * @stable ICU 2.8
+ */
+ static le_uint32 swapLong(le_uint32 value)
+ {
+#if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || defined(__BIG_ENDIAN__)
+ // Fastpath when we know that the platform is big-endian.
+ return value;
+#else
+ // Reads a big-endian value on any platform.
+ const le_uint8 *p = reinterpret_cast<const le_uint8 *>(&value);
+ return (le_uint32)((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
+#endif
+ };
+
+private:
+ LESwaps() {} // private - forbid instantiation
+};
+
+U_NAMESPACE_END
+#endif