LESwaps.h

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/*
 *
 * (C) Copyright IBM Corp. 1998-2014 - All Rights Reserved
 *
 */
 
#ifndef __LESWAPS_H
#define __LESWAPS_H
 
#include "LETypes.h"

 
U_NAMESPACE_BEGIN

#define SWAPW(value) LESwaps::swapWord((le_uint16)(value))

#define SWAPL(value) LESwaps::swapLong((le_uint32)(value))

class U_LAYOUT_API LESwaps /* not : public UObject because all methods are static */ {
public:

    static le_uint16 swapWord(le_uint16 value)
    {
#if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || \
    (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && (BYTE_ORDER == 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
    };

    static le_uint32 swapLong(le_uint32 value)
    {
#if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || \
    (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && (BYTE_ORDER == 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