| 1 | /**************************************************************************** | 
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| 2 | ** | 
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| 3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). | 
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| 4 | ** Contact: Qt Software Information (qt-info@nokia.com) | 
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| 5 | ** | 
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| 6 | ** This file is part of the documentation of the Qt Toolkit. | 
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| 7 | ** | 
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| 8 | ** $QT_BEGIN_LICENSE:LGPL$ | 
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| 9 | ** Commercial Usage | 
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| 10 | ** Licensees holding valid Qt Commercial licenses may use this file in | 
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| 11 | ** accordance with the Qt Commercial License Agreement provided with the | 
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| 12 | ** Software or, alternatively, in accordance with the terms contained in | 
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| 13 | ** a written agreement between you and Nokia. | 
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| 14 | ** | 
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| 15 | ** GNU Lesser General Public License Usage | 
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| 16 | ** Alternatively, this file may be used under the terms of the GNU Lesser | 
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| 17 | ** General Public License version 2.1 as published by the Free Software | 
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| 18 | ** Foundation and appearing in the file LICENSE.LGPL included in the | 
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| 19 | ** packaging of this file.  Please review the following information to | 
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| 20 | ** ensure the GNU Lesser General Public License version 2.1 requirements | 
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| 21 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. | 
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| 22 | ** | 
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| 23 | ** In addition, as a special exception, Nokia gives you certain | 
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| 24 | ** additional rights. These rights are described in the Nokia Qt LGPL | 
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| 25 | ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this | 
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| 26 | ** package. | 
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| 27 | ** | 
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| 28 | ** GNU General Public License Usage | 
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| 29 | ** Alternatively, this file may be used under the terms of the GNU | 
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| 30 | ** General Public License version 3.0 as published by the Free Software | 
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the | 
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| 32 | ** packaging of this file.  Please review the following information to | 
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be | 
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html. | 
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| 35 | ** | 
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| 36 | ** If you are unsure which license is appropriate for your use, please | 
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| 37 | ** contact the sales department at qt-sales@nokia.com. | 
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| 38 | ** $QT_END_LICENSE$ | 
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| 39 | ** | 
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| 40 | ****************************************************************************/ | 
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| 41 |  | 
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| 42 | /*! | 
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| 43 | \headerfile <QtEndian> | 
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| 44 | \title Endian Conversion Functions | 
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| 45 | \ingroup architecture | 
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| 46 | \brief The <QtEndian> header provides functions to convert between | 
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| 47 | little and big endian representations of numbers. | 
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| 48 | */ | 
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| 49 |  | 
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| 50 | /*! | 
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| 51 | \fn T qFromBigEndian(const uchar *src) | 
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| 52 | \since 4.3 | 
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| 53 | \relates <QtEndian> | 
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| 54 |  | 
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| 55 | Reads a big-endian number from memory location \a src and returns the number in the | 
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| 56 | host byte order representation. | 
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| 57 | On CPU architectures where the host byte order is little-endian (such as x86) this | 
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| 58 | will swap the byte order; otherwise it will just read from \a src. | 
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| 59 |  | 
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| 60 | \note Template type \c{T} can either be a qint16, qint32 or qint64. Other types of | 
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| 61 | integers, e.g., qlong, are not applicable. | 
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| 62 |  | 
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| 63 | There are no data alignment constraints for \a src. | 
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| 64 |  | 
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| 65 | \sa qFromLittleEndian() | 
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| 66 | \sa qToBigEndian() | 
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| 67 | \sa qToLittleEndian() | 
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| 68 | */ | 
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| 69 | /*! | 
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| 70 | \fn T qFromBigEndian(T src) | 
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| 71 | \since 4.3 | 
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| 72 | \relates <QtEndian> | 
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| 73 | \overload | 
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| 74 |  | 
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| 75 | Converts \a src from big-endian byte order and returns the number in host byte order | 
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| 76 | representation of that number. | 
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| 77 | On CPU architectures where the host byte order is little-endian (such as x86) this | 
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| 78 | will return \a src with the byte order swapped; otherwise it will return \a src | 
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| 79 | unmodified. | 
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| 80 | */ | 
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| 81 | /*! | 
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| 82 | \fn T qFromLittleEndian(const uchar *src) | 
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| 83 | \since 4.3 | 
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| 84 | \relates <QtEndian> | 
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| 85 |  | 
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| 86 | Reads a little-endian number from memory location \a src and returns the number in | 
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| 87 | the host byte order representation. | 
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| 88 | On CPU architectures where the host byte order is big-endian (such as PowerPC) this | 
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| 89 | will swap the byte order; otherwise it will just read from \a src. | 
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| 90 |  | 
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| 91 | \note Template type \c{T} can either be a qint16, qint32 or qint64. Other types of | 
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| 92 | integers, e.g., qlong, are not applicable. | 
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| 93 |  | 
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| 94 | There are no data alignment constraints for \a src. | 
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| 95 |  | 
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| 96 | \sa qFromBigEndian() | 
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| 97 | \sa qToBigEndian() | 
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| 98 | \sa qToLittleEndian() | 
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| 99 | */ | 
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| 100 | /*! | 
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| 101 | \fn T qFromLittleEndian(T src) | 
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| 102 | \since 4.3 | 
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| 103 | \relates <QtEndian> | 
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| 104 | \overload | 
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| 105 |  | 
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| 106 | Converts \a src from little-endian byte order and returns the number in host byte | 
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| 107 | order representation of that number. | 
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| 108 | On CPU architectures where the host byte order is big-endian (such as PowerPC) this | 
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| 109 | will return \a src with the byte order swapped; otherwise it will return \a src | 
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| 110 | unmodified. | 
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| 111 | */ | 
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| 112 | /*! | 
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| 113 | \fn void qToBigEndian(T src, uchar *dest) | 
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| 114 | \since 4.3 | 
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| 115 | \relates <QtEndian> | 
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| 116 |  | 
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| 117 | Writes the number \a src with template type \c{T} to the memory location at \a dest | 
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| 118 | in big-endian byte order. | 
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| 119 |  | 
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| 120 | Note that template type \c{T} can only be an integer data type (signed or unsigned). | 
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| 121 |  | 
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| 122 | There are no data alignment constraints for \a dest. | 
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| 123 |  | 
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| 124 | \sa qFromBigEndian() | 
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| 125 | \sa qFromLittleEndian() | 
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| 126 | \sa qToLittleEndian() | 
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| 127 | */ | 
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| 128 | /*! | 
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| 129 | \fn T qToBigEndian(T src) | 
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| 130 | \since 4.3 | 
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| 131 | \relates <QtEndian> | 
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| 132 | \overload | 
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| 133 |  | 
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| 134 | Converts \a src from host byte order and returns the number in big-endian byte order | 
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| 135 | representation of that number. | 
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| 136 | On CPU architectures where the host byte order is little-endian (such as x86) this | 
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| 137 | will return \a src with the byte order swapped; otherwise it will return \a src | 
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| 138 | unmodified. | 
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| 139 | */ | 
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| 140 | /*! | 
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| 141 | \fn void qToLittleEndian(T src, uchar *dest) | 
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| 142 | \since 4.3 | 
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| 143 | \relates <QtEndian> | 
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| 144 |  | 
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| 145 | Writes the number \a src with template type \c{T} to the memory location at \a dest | 
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| 146 | in little-endian byte order. | 
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| 147 |  | 
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| 148 | Note that template type \c{T} can only be an integer data type (signed or unsigned). | 
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| 149 |  | 
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| 150 | There are no data alignment constraints for \a dest. | 
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| 151 |  | 
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| 152 | \sa qFromBigEndian() | 
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| 153 | \sa qFromLittleEndian() | 
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| 154 | \sa qToBigEndian() | 
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| 155 | */ | 
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| 156 | /*! | 
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| 157 | \fn T qToLittleEndian(T src) | 
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| 158 | \since 4.3 | 
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| 159 | \relates <QtEndian> | 
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| 160 | \overload | 
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| 161 |  | 
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| 162 | Converts \a src from host byte order and returns the number in little-endian byte | 
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| 163 | order representation of that number. | 
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| 164 | On CPU architectures where the host byte order is big-endian (such as PowerPC) this | 
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| 165 | will return \a src with the byte order swapped; otherwise it will return \a src | 
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| 166 | unmodified. | 
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| 167 | */ | 
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| 168 |  | 
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