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 /****************************************************************************
 **
 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information (qt-info@nokia.com)
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
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 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU Lesser General Public License version 2.1 requirements
 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain
 ** additional rights. These rights are described in the Nokia Qt LGPL
 ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
 ** package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3.0 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.  Please review the following information to
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 ****************************************************************************/
 
 #ifndef QENDIAN_H
 #define QENDIAN_H
 
 #include <QtCore/qglobal.h>
 
 QT_BEGIN_HEADER
 
 QT_BEGIN_NAMESPACE
 
 QT_MODULE(Core)
 
 /*
  * ENDIAN FUNCTIONS
 */
 inline void qbswap_helper(const uchar *src, uchar *dest, int size)
 {
     for (int i = 0; i < size ; ++i) dest[i] = src[size - 1 - i];
 }
 
 /*
  * qbswap(const T src, const uchar *dest);
  * Changes the byte order of \a src from big endian to little endian or vice versa
  * and stores the result in \a dest.
  * There is no alignment requirements for \a dest.
 */
 template <typename T> inline void qbswap(const T src, uchar *dest)
 {
     qbswap_helper(reinterpret_cast<const uchar *>(&src), dest, sizeof(T));
 }
 
 // Used to implement a type-safe and alignment-safe copy operation
 // If you want to avoid the memcopy, you must write specializations for this function
 template <typename T> inline void qToUnaligned(const T src, uchar *dest)
 {
     qMemCopy(dest, &src, sizeof(T));
 }
 
 /* T qFromLittleEndian(const uchar *src)
  * This function will read a little-endian encoded value from \a src
  * and return the value in host-endian encoding.
  * There is no requirement that \a src must be aligned.
 */
 #if defined Q_CC_MSVC && _MSC_VER < 1300 || defined Q_CC_SUN
 inline quint64 qFromLittleEndian_helper(const uchar *src, quint64 *dest)
 {
     return 0
         | src[0]
         | src[1] * Q_UINT64_C(0x0000000000000100)
         | src[2] * Q_UINT64_C(0x0000000000010000)
         | src[3] * Q_UINT64_C(0x0000000001000000)
         | src[4] * Q_UINT64_C(0x0000000100000000)
         | src[5] * Q_UINT64_C(0x0000010000000000)
         | src[6] * Q_UINT64_C(0x0001000000000000)
         | src[7] * Q_UINT64_C(0x0100000000000000);
 }
 
 inline quint32 qFromLittleEndian_helper(const uchar *src, quint32 *dest)
 {
     return 0
         | src[0]
         | src[1] * quint32(0x00000100)
         | src[2] * quint32(0x00010000)
         | src[3] * quint32(0x01000000);
 }
 
 inline quint16 qFromLittleEndian_helper(const uchar *src, quint16 *dest)
 {
     return 0
         | src[0]
         | src[1] * 0x0100;
 }
 
 inline qint64 qFromLittleEndian_helper(const uchar *src, qint64 * dest)
 { return static_cast<qint64>(qFromLittleEndian_helper(src, reinterpret_cast<quint64*>(0))); }
 inline qint32 qFromLittleEndian_helper(const uchar *src, qint32 * dest)
 { return static_cast<qint32>(qFromLittleEndian_helper(src, reinterpret_cast<quint32*>(0))); }
 inline qint16 qFromLittleEndian_helper(const uchar *src, qint16 * dest)
 { return static_cast<qint16>(qFromLittleEndian_helper(src, reinterpret_cast<quint16*>(0))); }
 
 template <class T> inline T qFromLittleEndian(const uchar *src)
 {
     return qFromLittleEndian_helper(src, reinterpret_cast<T*>(0));
 }
 
 #else
 template <typename T> inline T qFromLittleEndian(const uchar *src);
 template <> inline quint64 qFromLittleEndian<quint64>(const uchar *src)
 {
     return 0
         | src[0]
         | src[1] * Q_UINT64_C(0x0000000000000100)
         | src[2] * Q_UINT64_C(0x0000000000010000)
         | src[3] * Q_UINT64_C(0x0000000001000000)
         | src[4] * Q_UINT64_C(0x0000000100000000)
         | src[5] * Q_UINT64_C(0x0000010000000000)
         | src[6] * Q_UINT64_C(0x0001000000000000)
         | src[7] * Q_UINT64_C(0x0100000000000000);
 }
 
 template <> inline quint32 qFromLittleEndian<quint32>(const uchar *src)
 {
     return 0
         | src[0]
         | src[1] * quint32(0x00000100)
         | src[2] * quint32(0x00010000)
         | src[3] * quint32(0x01000000);
 }
 
 template <> inline quint16 qFromLittleEndian<quint16>(const uchar *src)
 {
     return 0
         | src[0]
         | src[1] * 0x0100;
 }
 
 // signed specializations
 template <> inline qint64 qFromLittleEndian<qint64>(const uchar *src)
 { return static_cast<qint64>(qFromLittleEndian<quint64>(src)); }
 
 template <> inline qint32 qFromLittleEndian<qint32>(const uchar *src)
 { return static_cast<qint32>(qFromLittleEndian<quint32>(src)); }
 
 template <> inline qint16 qFromLittleEndian<qint16>(const uchar *src)
 { return static_cast<qint16>(qFromLittleEndian<quint16>(src)); }
 #endif
 
 /* This function will read a big-endian (also known as network order) encoded value from \a src
  * and return the value in host-endian encoding.
  * There is no requirement that \a src must be aligned.
 */
 #if defined Q_CC_MSVC && _MSC_VER < 1300 || defined Q_CC_SUN
 inline quint64 qFromBigEndian_helper(const uchar *src, quint64 *dest)
 {
     return 0
         | src[7]
         | src[6] * Q_UINT64_C(0x0000000000000100)
         | src[5] * Q_UINT64_C(0x0000000000010000)
         | src[4] * Q_UINT64_C(0x0000000001000000)
         | src[3] * Q_UINT64_C(0x0000000100000000)
         | src[2] * Q_UINT64_C(0x0000010000000000)
         | src[1] * Q_UINT64_C(0x0001000000000000)
         | src[0] * Q_UINT64_C(0x0100000000000000);
 }
 
 inline quint32 qFromBigEndian_helper(const uchar *src, quint32 * dest)
 {
     return 0
         | src[3]
         | src[2] * quint32(0x00000100)
         | src[1] * quint32(0x00010000)
         | src[0] * quint32(0x01000000);
 }
 
 inline quint16 qFromBigEndian_helper(const uchar *src, quint16 * des)
 {
     return 0
         | src[1]
         | src[0] * 0x0100;
 }
 
 
 inline qint64 qFromBigEndian_helper(const uchar *src, qint64 * dest)
 { return static_cast<qint64>(qFromBigEndian_helper(src, reinterpret_cast<quint64*>(0))); }
 inline qint32 qFromBigEndian_helper(const uchar *src, qint32 * dest)
 { return static_cast<qint32>(qFromBigEndian_helper(src, reinterpret_cast<quint32*>(0))); }
 inline qint16 qFromBigEndian_helper(const uchar *src, qint16 * dest)
 { return static_cast<qint16>(qFromBigEndian_helper(src, reinterpret_cast<quint16*>(0))); }
 
 template <class T> inline T qFromBigEndian(const uchar *src)
 {
     return qFromBigEndian_helper(src, reinterpret_cast<T*>(0));
 }
 
 #else
 template <class T> inline T qFromBigEndian(const uchar *src);
 template<>
 inline quint64 qFromBigEndian<quint64>(const uchar *src)
 {
     return 0
         | src[7]
         | src[6] * Q_UINT64_C(0x0000000000000100)
         | src[5] * Q_UINT64_C(0x0000000000010000)
         | src[4] * Q_UINT64_C(0x0000000001000000)
         | src[3] * Q_UINT64_C(0x0000000100000000)
         | src[2] * Q_UINT64_C(0x0000010000000000)
         | src[1] * Q_UINT64_C(0x0001000000000000)
         | src[0] * Q_UINT64_C(0x0100000000000000);
 }
 
 template<>
 inline quint32 qFromBigEndian<quint32>(const uchar *src)
 {
     return 0
         | src[3]
         | src[2] * quint32(0x00000100)
         | src[1] * quint32(0x00010000)
         | src[0] * quint32(0x01000000);
 }
 
 template<>
 inline quint16 qFromBigEndian<quint16>(const uchar *src)
 {
     return 0
         | src[1]
         | src[0] * quint16(0x0100);
 }
 
 
 // signed specializations
 template <> inline qint64 qFromBigEndian<qint64>(const uchar *src)
 { return static_cast<qint64>(qFromBigEndian<quint64>(src)); }
 
 template <> inline qint32 qFromBigEndian<qint32>(const uchar *src)
 { return static_cast<qint32>(qFromBigEndian<quint32>(src)); }
 
 template <> inline qint16 qFromBigEndian<qint16>(const uchar *src)
 { return static_cast<qint16>(qFromBigEndian<quint16>(src)); }
 #endif
 /*
  * T qbswap(T source).
  * Changes the byte order of a value from big endian to little endian or vice versa.
  * This function can be used if you are not concerned about alignment issues,
  * and it is therefore a bit more convenient and in most cases more efficient.
 */
 template <typename T> T qbswap(T source);
 template <> inline quint64 qbswap<quint64>(quint64 source)
 {
     return 0
         | ((source & Q_UINT64_C(0x00000000000000ff)) << 56)
         | ((source & Q_UINT64_C(0x000000000000ff00)) << 40)
         | ((source & Q_UINT64_C(0x0000000000ff0000)) << 24)
         | ((source & Q_UINT64_C(0x00000000ff000000)) << 8)
         | ((source & Q_UINT64_C(0x000000ff00000000)) >> 8)
         | ((source & Q_UINT64_C(0x0000ff0000000000)) >> 24)
         | ((source & Q_UINT64_C(0x00ff000000000000)) >> 40)
         | ((source & Q_UINT64_C(0xff00000000000000)) >> 56);
 }
 
 template <> inline quint32 qbswap<quint32>(quint32 source)
 {
     return 0
         | ((source & 0x000000ff) << 24)
         | ((source & 0x0000ff00) << 8)
         | ((source & 0x00ff0000) >> 8)
         | ((source & 0xff000000) >> 24);
 }
 
 template <> inline quint16 qbswap<quint16>(quint16 source)
 {
     return 0
         | ((source & 0x00ff) << 8)
         | ((source & 0xff00) >> 8);
 }
 
 // signed specializations
 template <> inline qint64 qbswap<qint64>(qint64 source)
 {
     return qbswap<quint64>(quint64(source));
 }
 
 template <> inline qint32 qbswap<qint32>(qint32 source)
 {
     return qbswap<quint32>(quint32(source));
 }
 
 template <> inline qint16 qbswap<qint16>(qint16 source)
 {
     return qbswap<quint16>(quint16(source));
 }
 
 #if Q_BYTE_ORDER == Q_BIG_ENDIAN
 
 template <typename T> inline T qToBigEndian(T source)
 { return source; }
 template <typename T> inline T qFromBigEndian(T source)
 { return source; }
 template <typename T> inline T qToLittleEndian(T source)
 { return qbswap<T>(source); }
 template <typename T> inline T qFromLittleEndian(T source)
 { return qbswap<T>(source); }
 template <typename T> inline void qToBigEndian(T src, uchar *dest)
 { qToUnaligned<T>(src, dest); }
 template <typename T> inline void qToLittleEndian(T src, uchar *dest)
 { qbswap<T>(src, dest); }
 #else // Q_LITTLE_ENDIAN
 
 template <typename T> inline T qToBigEndian(T source)
 { return qbswap<T>(source); }
 template <typename T> inline T qFromBigEndian(T source)
 { return qbswap<T>(source); }
 template <typename T> inline T qToLittleEndian(T source)
 { return source; }
 template <typename T> inline T qFromLittleEndian(T source)
 { return source; }
 template <typename T> inline void qToBigEndian(T src, uchar *dest)
 { qbswap<T>(src, dest); }
 template <typename T> inline void qToLittleEndian(T src, uchar *dest)
 { qToUnaligned<T>(src, dest); }
 
 #endif // Q_BYTE_ORDER == Q_BIG_ENDIAN
 
 QT_END_NAMESPACE
 
 QT_END_HEADER
 
 #endif // QENDIAN_H