\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5×\D6?\BDê\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2€ \00 $\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4ê\E9\F2á\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// File Manager

File Manager

Path: /usr/include/layout/

Viewing File: LESwaps.h

/*
 *
 * (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(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
    };

    /**
     * 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(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