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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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "quuid.h"
+
+#include "qdatastream.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QUuid
+    \brief The QUuid class stores a Universally Unique Identifier (UUID).
+
+    \reentrant
+    \ingroup misc
+
+    Using \e{U}niversally \e{U}nique \e{ID}entifiers (UUID) is a
+    standard way to uniquely identify entities in a distributed
+    computing environment. A UUID is a 16-byte (128-bit) number
+    generated by some algorithm that is meant to guarantee that the
+    UUID will be unique in the distributed computing environment where
+    it is used. The acronym GUID is often used instead, \e{G}lobally
+    \e{U}nique \e{ID}entifiers, but it refers to the same thing.
+
+    \target Variant field
+    Actually, the GUID is one \e{variant} of UUID. Multiple variants
+    are in use. Each UUID contains a bit field that specifies which
+    type (variant) of UUID it is. Call variant() to discover which
+    type of UUID an instance of QUuid contains. It extracts the three
+    most signifcant bits of byte 8 of the 16 bytes. In QUuid, byte 8
+    is \c{QUuid::data4[0]}. If you create instances of QUuid using the
+    constructor that accepts all the numeric values as parameters, use
+    the following table to set the three most significant bits of
+    parameter \c{b1}, which becomes \c{QUuid::data4[0]} and contains
+    the variant field in its three most significant bits. In the
+    table, 'x' means \e {don't care}.
+
+    \table
+    \header
+    \o msb0
+    \o msb1
+    \o msb2
+    \o Variant 
+
+    \row
+    \o 0
+    \o x
+    \o x
+    \o NCS (Network Computing System)
+
+    \row
+    \o 1
+    \o 0
+    \o x
+    \o DCE (Distributed Computing Environment)
+
+    \row
+    \o 1
+    \o 1
+    \o 0
+    \o Microsoft (GUID)
+
+    \row
+    \o 1
+    \o 1
+    \o 1
+    \o Reserved for future expansion
+
+    \endtable
+
+    \target Version field
+    If variant() returns QUuid::DCE, the UUID also contains a
+    \e{version} field in the four most significant bits of
+    \c{QUuid::data3}, and you can call version() to discover which
+    version your QUuid contains. If you create instances of QUuid
+    using the constructor that accepts all the numeric values as
+    parameters, use the following table to set the four most
+    significant bits of parameter \c{w2}, which becomes
+    \c{QUuid::data3} and contains the version field in its four most
+    significant bits.
+
+    \table
+    \header
+    \o msb0
+    \o msb1
+    \o msb2
+    \o msb3
+    \o Version
+
+    \row
+    \o 0
+    \o 0
+    \o 0
+    \o 1
+    \o Time
+
+    \row
+    \o 0
+    \o 0
+    \o 1
+    \o 0
+    \o Embedded POSIX
+
+    \row
+    \o 0
+    \o 0
+    \o 1
+    \o 1
+    \o Name
+
+    \row
+    \o 0
+    \o 1
+    \o 0
+    \o 0
+    \o Random
+
+    \endtable
+
+    The field layouts for the DCE versions listed in the table above
+    are specified in the \l{http://www.ietf.org/rfc/rfc4122.txt}
+    {Network Working Group UUID Specification}.
+    
+    Most platforms provide a tool for generating new UUIDs, e.g. \c
+    uuidgen and \c guidgen. You can also use createUuid().  UUIDs
+    generated by createUuid() are of the random type.  Their
+    QUuid::Version bits are set to QUuid::Random, and their
+    QUuid::Variant bits are set to QUuid::DCE. The rest of the UUID is
+    composed of random numbers. Theoretically, this means there is a
+    small chance that a UUID generated by createUuid() will not be
+    unique. But it is
+    \l{http://en.wikipedia.org/wiki/Universally_Unique_Identifier#Random_UUID_probability_of_duplicates}
+    {a \e{very} small chance}.
+
+    UUIDs can be constructed from numeric values or from strings, or
+    using the static createUuid() function. They can be converted to a
+    string with toString(). UUIDs have a variant() and a version(),
+    and null UUIDs return true from isNull().
+*/
+
+/*!
+    \fn QUuid::QUuid(const GUID &guid)
+
+    Casts a Windows \a guid to a Qt QUuid.
+
+    \warning This function is only for Windows platforms.
+*/
+
+/*!
+    \fn QUuid &QUuid::operator=(const GUID &guid)
+
+    Assigns a Windows \a guid to a Qt QUuid.
+
+    \warning This function is only for Windows platforms.
+*/
+
+/*!
+    \fn QUuid::operator GUID() const
+
+    Returns a Windows GUID from a QUuid.
+
+    \warning This function is only for Windows platforms.
+*/
+
+/*!
+    \fn QUuid::QUuid()
+
+    Creates the null UUID. toString() will output the null UUID
+    as "{00000000-0000-0000-0000-000000000000}".
+*/
+
+/*!
+    \fn QUuid::QUuid(uint l, ushort w1, ushort w2, uchar b1, uchar b2, uchar b3, uchar b4, uchar b5, uchar b6, uchar b7, uchar b8)
+
+    Creates a UUID with the value specified by the parameters, \a l,
+    \a w1, \a w2, \a b1, \a b2, \a b3, \a b4, \a b5, \a b6, \a b7, \a
+    b8.
+
+    Example:
+    \snippet doc/src/snippets/code/src_corelib_plugin_quuid.cpp 0
+*/
+
+#ifndef QT_NO_QUUID_STRING
+/*!
+  Creates a QUuid object from the string \a text, which must be
+  formatted as five hex fields separated by '-', e.g.,
+  "{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}" where 'x' is a hex
+  digit. The curly braces shown here are optional, but it is normal to
+  include them. If the conversion fails, a null UUID is created.  See
+  toString() for an explanation of how the five hex fields map to the
+  public data members in QUuid.
+
+    \sa toString(), QUuid()
+*/
+QUuid::QUuid(const QString &text)
+{
+    bool ok;
+    if (text.isEmpty()) {
+        *this = QUuid();
+        return;
+    }
+    QString temp = text.toUpper();
+    if (temp[0] != QLatin1Char('{'))
+        temp = QLatin1Char('{') + text;
+    if (text[(int)text.length()-1] != QLatin1Char('}'))
+        temp += QLatin1Char('}');
+
+    data1 = temp.mid(1, 8).toULongLong(&ok, 16);
+    if (!ok) {
+        *this = QUuid();
+        return;
+    }
+
+    data2 = temp.mid(10, 4).toUInt(&ok, 16);
+    if (!ok) {
+        *this = QUuid();
+        return;
+    }
+    data3 = temp.mid(15, 4).toUInt(&ok, 16);
+    if (!ok) {
+        *this = QUuid();
+        return;
+    }
+    data4[0] = temp.mid(20, 2).toUInt(&ok, 16);
+    if (!ok) {
+        *this = QUuid();
+        return;
+    }
+    data4[1] = temp.mid(22, 2).toUInt(&ok, 16);
+    if (!ok) {
+        *this = QUuid();
+        return;
+    }
+    for (int i = 2; i<8; i++) {
+        data4[i] = temp.mid(25 + (i-2)*2, 2).toUShort(&ok, 16);
+        if (!ok) {
+            *this = QUuid();
+            return;
+        }
+    }
+}
+
+/*!
+    \internal
+*/
+QUuid::QUuid(const char *text)
+{
+    *this = QUuid(QString::fromLatin1(text));
+}
+#endif
+
+/*!
+    \fn bool QUuid::operator==(const QUuid &other) const
+
+    Returns true if this QUuid and the \a other QUuid are identical;
+    otherwise returns false.
+*/
+
+/*!
+    \fn bool QUuid::operator!=(const QUuid &other) const
+
+    Returns true if this QUuid and the \a other QUuid are different;
+    otherwise returns false.
+*/
+#ifndef QT_NO_QUUID_STRING
+/*!
+    \fn QUuid::operator QString() const
+
+    Returns the string representation of the uuid.
+
+    \sa toString()
+*/
+
+static QString uuidhex(uint data, int digits)
+{
+    return QString::number(data, 16).rightJustified(digits, QLatin1Char('0'));
+}
+
+/*!
+    Returns the string representation of this QUuid. The string is
+    formatted as five hex fields separated by '-' and enclosed in
+    curly braces, i.e., "{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}" where
+    'x' is a hex digit.  From left to right, the five hex fields are
+    obtained from the four public data members in QUuid as follows:
+
+    \table
+    \header
+    \o Field #
+    \o Source
+    
+    \row
+    \o 1
+    \o data1
+    
+    \row
+    \o 2
+    \o data2
+    
+    \row
+    \o 3
+    \o data3
+    
+    \row
+    \o 4
+    \o data4[0] .. data4[1]
+    
+    \row
+    \o 5
+    \o data4[2] .. data4[7]
+
+    \endtable
+*/
+QString QUuid::toString() const
+{
+    QString result;
+
+    QChar dash = QLatin1Char('-');
+    result = QLatin1Char('{') + uuidhex(data1,8);
+    result += dash;
+    result += uuidhex(data2,4);
+    result += dash;
+    result += uuidhex(data3,4);
+    result += dash;
+    result += uuidhex(data4[0],2);
+    result += uuidhex(data4[1],2);
+    result += dash;
+    for (int i = 2; i < 8; i++)
+        result += uuidhex(data4[i],2);
+
+    return result + QLatin1Char('}');
+}
+#endif
+
+#ifndef QT_NO_DATASTREAM
+/*!
+    \relates QUuid
+    Writes the UUID \a id to the data stream \a s.
+*/
+QDataStream &operator<<(QDataStream &s, const QUuid &id)
+{
+    s << (quint32)id.data1;
+    s << (quint16)id.data2;
+    s << (quint16)id.data3;
+    for (int i = 0; i < 8; i++)
+        s << (quint8)id.data4[i];
+    return s;
+}
+
+/*!
+    \relates QUuid
+    Reads a UUID from the stream \a s into \a id.
+*/
+QDataStream &operator>>(QDataStream &s, QUuid &id)
+{
+    quint32 u32;
+    quint16 u16;
+    quint8 u8;
+    s >> u32;
+    id.data1 = u32;
+    s >> u16;
+    id.data2 = u16;
+    s >> u16;
+    id.data3 = u16;
+    for (int i = 0; i < 8; i++) {
+        s >> u8;
+        id.data4[i] = u8;
+    }
+    return s;
+}
+#endif
+
+/*!
+    Returns true if this is the null UUID
+    {00000000-0000-0000-0000-000000000000}; otherwise returns false.
+*/
+bool QUuid::isNull() const
+{
+    return data4[0] == 0 && data4[1] == 0 && data4[2] == 0 && data4[3] == 0 &&
+           data4[4] == 0 && data4[5] == 0 && data4[6] == 0 && data4[7] == 0 &&
+           data1 == 0 && data2 == 0 && data3 == 0;
+}
+
+/*!
+    \enum QUuid::Variant
+
+    This enum defines the values used in the \l{Variant field}
+    {variant field} of the UUID. The value in the variant field
+    determines the layout of the 128-bit value.
+
+    \value VarUnknown Variant is unknown
+    \value NCS Reserved for NCS (Network Computing System) backward compatibility
+    \value DCE Distributed Computing Environment, the scheme used by QUuid
+    \value Microsoft Reserved for Microsoft backward compatibility (GUID)
+    \value Reserved Reserved for future definition
+*/
+
+/*!
+    \enum QUuid::Version
+
+    This enum defines the values used in the \l{Version field}
+    {version field} of the UUID. The version field is meaningful
+    only if the value in the \l{Variant field} {variant field}
+    is QUuid::DCE.
+
+    \value VerUnknown Version is unknown
+    \value Time Time-based, by using timestamp, clock sequence, and
+    MAC network card address (if available) for the node sections
+    \value EmbeddedPOSIX DCE Security version, with embedded POSIX UUIDs
+    \value Name Name-based, by using values from a name for all sections
+    \value Random Random-based, by using random numbers for all sections
+*/
+
+/*!
+    \fn QUuid::Variant QUuid::variant() const
+
+    Returns the value in the \l{Variant field} {variant field} of the
+    UUID. If the return value is QUuid::DCE, call version() to see
+    which layout it uses. The null UUID is considered to be of an
+    unknown variant.
+
+    \sa version()
+*/
+QUuid::Variant QUuid::variant() const
+{
+    if (isNull())
+        return VarUnknown;
+    // Check the 3 MSB of data4[0]
+    if ((data4[0] & 0x80) == 0x00) return NCS;
+    else if ((data4[0] & 0xC0) == 0x80) return DCE;
+    else if ((data4[0] & 0xE0) == 0xC0) return Microsoft;
+    else if ((data4[0] & 0xE0) == 0xE0) return Reserved;
+    return VarUnknown;
+}
+
+/*!
+    \fn QUuid::Version QUuid::version() const
+
+    Returns the \l{Version field} {version field} of the UUID, if the
+    UUID's \l{Variant field} {variant field} is QUuid::DCE. Otherwise
+    it returns QUuid::VerUnknown.
+
+    \sa variant()
+*/
+QUuid::Version QUuid::version() const
+{
+    // Check the 4 MSB of data3
+    Version ver = (Version)(data3>>12);
+    if (isNull()
+         || (variant() != DCE)
+         || ver < Time
+         || ver > Random)
+        return VerUnknown;
+    return ver;
+}
+
+/*!
+    \fn bool QUuid::operator<(const QUuid &other) const
+
+    Returns true if this QUuid has the same \l{Variant field}
+    {variant field} as the \a other QUuid and is lexicographically
+    \e{before} the \a other QUuid. If the \a other QUuid has a
+    different variant field, the return value is determined by
+    comparing the two \l{QUuid::Variant} {variants}.
+
+    \sa variant()
+*/
+#define ISLESS(f1, f2) if (f1!=f2) return (f1<f2);
+bool QUuid::operator<(const QUuid &other) const
+{
+    if (variant() != other.variant())
+        return variant() < other.variant();
+
+    ISLESS(data1, other.data1);
+    ISLESS(data2, other.data2);
+    ISLESS(data3, other.data3);
+    for (int n = 0; n < 8; n++) {
+        ISLESS(data4[n], other.data4[n]);
+    }
+    return false;
+}
+
+/*!
+    \fn bool QUuid::operator>(const QUuid &other) const
+
+    Returns true if this QUuid has the same \l{Variant field}
+    {variant field} as the \a other QUuid and is lexicographically
+    \e{after} the \a other QUuid. If the \a other QUuid has a
+    different variant field, the return value is determined by
+    comparing the two \l{QUuid::Variant} {variants}.
+
+    \sa variant()
+*/
+#define ISMORE(f1, f2) if (f1!=f2) return (f1>f2);
+bool QUuid::operator>(const QUuid &other) const
+{
+    if (variant() != other.variant())
+        return variant() > other.variant();
+
+    ISMORE(data1, other.data1);
+    ISMORE(data2, other.data2);
+    ISMORE(data3, other.data3);
+    for (int n = 0; n < 8; n++) {
+        ISMORE(data4[n], other.data4[n]);
+    }
+    return false;
+}
+
+/*!
+    \fn QUuid QUuid::createUuid()
+
+    On any platform other than Windows, this function returns a new
+    UUID with variant QUuid::DCE and version QUuid::Random. The random
+    numbers used to construct the UUID are obtained from the local
+    pseudo-random generator, which is usually not a cryptographic
+    quality random number generator. Therefore, a UUID generated by
+    this function can't be guaranteed to be unique.
+
+    On a Windows platform, a GUID is generated, which almost certainly
+    \e{will} be unique, on this or any other system, networked or not.
+
+    \sa variant(), version()
+*/
+#if defined(Q_OS_WIN32)
+
+QT_BEGIN_INCLUDE_NAMESPACE
+#include <objbase.h> // For CoCreateGuid
+QT_END_INCLUDE_NAMESPACE
+
+QUuid QUuid::createUuid()
+{
+    GUID guid;
+    CoCreateGuid(&guid);
+    QUuid result = guid;
+    return result;
+}
+
+#else // !Q_OS_WIN32
+
+QT_BEGIN_INCLUDE_NAMESPACE
+#include "qdatetime.h"
+#include "stdlib.h" // For srand/rand
+QT_END_INCLUDE_NAMESPACE
+
+QUuid QUuid::createUuid()
+{
+    static const int intbits = sizeof(int)*8;
+    static int randbits = 0;
+    if (!randbits) {
+        int max = RAND_MAX;
+        do { ++randbits; } while ((max=max>>1));
+        qsrand((uint)QDateTime::currentDateTime().toTime_t());
+        qrand(); // Skip first
+    }
+
+    QUuid result;
+    uint *data = &(result.data1);
+    int chunks = 16 / sizeof(uint);
+    while (chunks--) {
+        uint randNumber = 0;
+        for (int filled = 0; filled < intbits; filled += randbits)
+            randNumber |= qrand()<<filled;
+         *(data+chunks) = randNumber;
+    }
+
+    result.data4[0] = (result.data4[0] & 0x3F) | 0x80;        // UV_DCE
+    result.data3 = (result.data3 & 0x0FFF) | 0x4000;        // UV_Random
+
+    return result;
+}
+#endif // !Q_OS_WIN32
+
+/*!
+    \fn bool QUuid::operator==(const GUID &guid) const
+
+    Returns true if this UUID is equal to the Windows GUID \a guid;
+    otherwise returns false.
+*/
+
+/*!
+    \fn bool QUuid::operator!=(const GUID &guid) const
+
+    Returns true if this UUID is not equal to the Windows GUID \a
+    guid; otherwise returns false.
+*/
+
+QT_END_NAMESPACE