/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
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**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
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**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qplatformdefs.h"
#include "qfileinfo.h"
#include "qdatetime.h"
#include "qabstractfileengine.h"
#include "qfsfileengine_p.h"
#include "qglobal.h"
#include "qatomic.h"
#include "qhash.h"
#include "qdir.h"

class QFileInfoPrivate
{
public:
    QFileInfoPrivate(const QFileInfo *copy=0);
    ~QFileInfoPrivate();

    void initFileEngine(const QString &);

    enum Access {
        ReadAccess,
        WriteAccess,
        ExecuteAccess
    };
    bool hasAccess(Access access) const;

    uint getFileFlags(QAbstractFileEngine::FileFlags) const;
    QDateTime &getFileTime(QAbstractFileEngine::FileTime) const;
    QString getFileName(QAbstractFileEngine::FileName) const;

    enum { CachedFileFlags=0x01, CachedLinkTypeFlag=0x02,
           CachedMTime=0x10, CachedCTime=0x20, CachedATime=0x40,
           CachedSize =0x08 };
    struct Data {
        inline Data()
            : ref(1), fileEngine(0), cache_enabled(1)
        { clear(); }
        inline Data(const Data &copy)
            : ref(1), fileEngine(QAbstractFileEngine::create(copy.fileName)),
              fileName(copy.fileName), cache_enabled(copy.cache_enabled)
        { clear(); }
        inline ~Data() { delete fileEngine; }
        inline void clear() {
            fileNames.clear();
            fileFlags = 0;
            cachedFlags = 0;
        }
        mutable QAtomic ref;

        QAbstractFileEngine *fileEngine;
        mutable QString fileName;
        mutable QHash<int, QString> fileNames;

        mutable uint cachedFlags : 31;
        mutable uint cache_enabled : 1;
        mutable uint fileFlags;
        mutable qint64 fileSize;
        mutable QDateTime fileTimes[3];
        inline bool getCachedFlag(uint c) const
        { return cache_enabled ? (cachedFlags & c) : 0; }
        inline void setCachedFlag(uint c)
        { if (cache_enabled) cachedFlags |= c; }
    } *data;
    inline void reset() {
        detach();
        data->clear();
    }
    void detach();
};

QFileInfoPrivate::QFileInfoPrivate(const QFileInfo *copy)
{
    if(copy) {
        copy->d_func()->data->ref.ref();
        data = copy->d_func()->data;
    } else {
        data = new QFileInfoPrivate::Data;
        data->clear();
    }
}

QFileInfoPrivate::~QFileInfoPrivate()
{
    if (!data->ref.deref())
        delete data;
    data = 0;
}

void
QFileInfoPrivate::initFileEngine(const QString &file)
{
    detach();
    delete data->fileEngine;
    data->fileEngine = 0;
    data->clear();
    data->fileEngine = QAbstractFileEngine::create(file);
    data->fileName = file;
}

bool QFileInfoPrivate::hasAccess(Access access) const
{
    if (!(data->fileEngine->fileFlags() & QAbstractFileEngine::LocalDiskFlag)) {
        switch (access) {
        case ReadAccess:
            return getFileFlags(QAbstractFileEngine::ReadUserPerm);
        case WriteAccess:
            return getFileFlags(QAbstractFileEngine::WriteUserPerm);
        case ExecuteAccess:
            return getFileFlags(QAbstractFileEngine::ExeUserPerm);
        default:
            return false;
        }
    }

    int mode = 0;
    switch (access) {
    case ReadAccess:
        mode = R_OK;
        break;
    case WriteAccess:
        mode = W_OK;
        break;
    case ExecuteAccess:
        mode = X_OK;
        break;
    };
#ifdef Q_OS_UNIX
    return QT_ACCESS(QFile::encodeName(data->fileName).data(), mode) == 0;
#endif
#ifdef Q_OS_WIN
    if ((access == ReadAccess && !getFileFlags(QAbstractFileEngine::ReadUserPerm))
        || (access == WriteAccess && !getFileFlags(QAbstractFileEngine::WriteUserPerm))) {
        return false;
    }
    if (access == ExecuteAccess)
        return getFileFlags(QAbstractFileEngine::ExeUserPerm);

    QT_WA( {
        return ::_waccess((TCHAR *)QFSFileEnginePrivate::longFileName(data->fileName).utf16(), mode) == 0;
    } , {
        return QT_ACCESS(QFSFileEnginePrivate::win95Name(data->fileName), mode) == 0;
    } );
#endif
    return false;
}

void QFileInfoPrivate::detach()
{ qAtomicDetach(data); }

QString
QFileInfoPrivate::getFileName(QAbstractFileEngine::FileName name) const
{
    if(data->cache_enabled && data->fileNames.contains((int)name))
        return data->fileNames.value(name);
    QString ret = data->fileEngine->fileName(name);
    if(data->cache_enabled)
        data->fileNames.insert((int)name, ret);
    return ret;
}

uint
QFileInfoPrivate::getFileFlags(QAbstractFileEngine::FileFlags request) const
{
    // we split the testing for LinkType and the rest because, in order to
    // determine if a file is a symlink or not, we have to lstat(). If we're not
    // interested in that information, we might as well avoid one extra syscall.

    QAbstractFileEngine::FileFlags flags;
    if (!data->getCachedFlag(CachedFileFlags)) {
        QAbstractFileEngine::FileFlags req = QAbstractFileEngine::FileInfoAll;
        req &= (~QAbstractFileEngine::LinkType);

        flags = data->fileEngine->fileFlags(req);
        data->setCachedFlag(CachedFileFlags);
        data->fileFlags |= uint(flags);
    } else {
        flags = QAbstractFileEngine::FileFlags(data->fileFlags & request);
    }

    if (request & QAbstractFileEngine::LinkType) {
        if (!data->getCachedFlag(CachedLinkTypeFlag)) {
            QAbstractFileEngine::FileFlags linkflag;
            linkflag = data->fileEngine->fileFlags(QAbstractFileEngine::LinkType);

            data->setCachedFlag(CachedLinkTypeFlag);
            data->fileFlags |= uint(linkflag);
            flags |= linkflag;
        }
    }
    // no else branch
    // if we had it cached, it was caught in the previous else branch

    return flags & request;
}

QDateTime
&QFileInfoPrivate::getFileTime(QAbstractFileEngine::FileTime request) const
{
    if(request == QAbstractFileEngine::CreationTime) {
        if(data->getCachedFlag(CachedCTime))
            return data->fileTimes[request];
        data->setCachedFlag(CachedCTime);
        return (data->fileTimes[request] = data->fileEngine->fileTime(request));
    }
    if(request == QAbstractFileEngine::ModificationTime) {
        if(data->getCachedFlag(CachedMTime))
            return data->fileTimes[request];
        data->setCachedFlag(CachedMTime);
        return (data->fileTimes[request] = data->fileEngine->fileTime(request));
    }
    if(request == QAbstractFileEngine::AccessTime) {
        if(data->getCachedFlag(CachedATime))
            return data->fileTimes[request];
        data->setCachedFlag(CachedATime);
        return (data->fileTimes[request] = data->fileEngine->fileTime(request));
    }
    return data->fileTimes[0]; //cannot really happen
}

//************* QFileInfo

/*!
    \class QFileInfo
    \reentrant
    \brief The QFileInfo class provides system-independent file information.

    \ingroup io
    \ingroup shared

    QFileInfo provides information about a file's name and position
    (path) in the file system, its access rights and whether it is a
    directory or symbolic link, etc. The file's size and last
    modified/read times are also available. QFileInfo can also be
    used to obtain information about a Qt \l{resource
    system}{resource}.

    A QFileInfo can point to a file with either a relative or an
    absolute file path. Absolute file paths begin with the directory
    separator "/" (or with a drive specification on Windows). Relative
    file names begin with a directory name or a file name and specify
    a path relative to the current working directory. An example of an
    absolute path is the string "/tmp/quartz". A relative path might
    look like "src/fatlib". You can use the function isRelative() to
    check whether a QFileInfo is using a relative or an absolute file
    path. You can call the function makeAbsolute() to convert a
    relative QFileInfo's path to an absolute path.

    The file that the QFileInfo works on is set in the constructor or
    later with setFile(). Use exists() to see if the file exists and
    size() to get its size.

    Some of QFileInfo's functions query the file system, but for
    performance reasons, some functions only operate on the
    file name itself. For example: To return the absolute path of
    a relative file name, absolutePath() has to query the file system.
    The path() function, however, can work on the file name directly,
    and so it is faster. By convention, QFileInfo interprets any path that
    ends with a slash '/' as a directory (e.g., "C:/WINDOWS/"), and
    those without a trailing slash (e.g., "C:/WINDOWS/hosts.txt")
    are treated as files.
    
    To speed up performance, QFileInfo caches information about the
    file. Because files can be changed by other users or programs, or
    even by other parts of the same program, there is a function that
    refreshes the file information: refresh(). If you want to switch
    off a QFileInfo's caching and force it to access the file system
    every time you request information from it call setCaching(false).

    The file's type is obtained with isFile(), isDir() and
    isSymLink(). The symLinkTarget() function provides the name of the file
    the symlink points to.

    On Unix (including Mac OS X), the symlink has the same size() has
    the file it points to, because Unix handles symlinks
    transparently; similarly, opening a symlink using QFile
    effectively opens the link's target. For example:

    \code
        #ifdef Q_OS_UNIX

        QFileInfo info1("/home/bob/bin/untabify");
        info1.isSymLink();          // returns true
        info1.absoluteFilePath();   // returns "/home/bob/bin/untabify"
        info1.size();               // returns 56201
        info1.symLinkTarget();      // returns "/opt/pretty++/bin/untabify"

        QFileInfo info2(info1.symLinkTarget());
        info1.isSymLink();          // returns false
        info1.absoluteFilePath();   // returns "/opt/pretty++/bin/untabify"
        info1.size();               // returns 56201

        #endif
    \endcode

    On Windows, symlinks (shortcuts) are \c .lnk files. The reported
    size() is that of the symlink (not the link's target), and
    opening a symlink using QFile opens the \c .lnk file. For
    example:

    \code
        #ifdef Q_OS_WIN

        QFileInfo info1("C:\\Documents and Settings\\Bob\\untabify.lnk");
        info1.isSymLink();          // returns true
        info1.absoluteFilePath();   // returns "C:/Documents and Settings/Bob/untabify.lnk"
        info1.size();               // returns 743
        info1.symLinkTarget();      // returns "C:/Pretty++/untabify"

        QFileInfo info2(info1.symLinkTarget());
        info1.isSymLink();          // returns false
        info1.absoluteFilePath();   // returns "C:/Pretty++/untabify"
        info1.size();               // returns 63942

        #endif
    \endcode

    Elements of the file's name can be extracted with path() and
    fileName(). The fileName()'s parts can be extracted with
    baseName() and extension().

    The file's dates are returned by created(), lastModified() and
    lastRead(). Information about the file's access permissions is
    obtained with isReadable(), isWritable() and isExecutable(). The
    file's ownership is available from owner(), ownerId(), group() and
    groupId(). You can examine a file's permissions and ownership in a
    single statement using the permission() function.

    \sa QDir, QFile
*/

/*!
    Constructs an empty QFileInfo object.

    Note that an empty QFileInfo object contain no file reference.

    \sa setFile()
*/

QFileInfo::QFileInfo() : d_ptr(new QFileInfoPrivate())
{
}

/*!
    Constructs a new QFileInfo that gives information about the given
    file. The \a file can also include an absolute or relative path.

    \sa setFile(), isRelative(), QDir::setCurrent(), QDir::isRelativePath()
*/

QFileInfo::QFileInfo(const QString &file) : d_ptr(new QFileInfoPrivate())
{
    d_ptr->initFileEngine(file);
}

/*!
    Constructs a new QFileInfo that gives information about file \a
    file.

    If the \a file has a relative path, the QFileInfo will also have a
    relative path.

    \sa isRelative()
*/

QFileInfo::QFileInfo(const QFile &file) : d_ptr(new QFileInfoPrivate())
{
    d_ptr->initFileEngine(file.fileName());
}

/*!
    Constructs a new QFileInfo that gives information about the given
    \a file in the directory \a dir.

    If \a dir has a relative path, the QFileInfo will also have a
    relative path.

    \sa isRelative()
*/

QFileInfo::QFileInfo(const QDir &dir, const QString &file) : d_ptr(new QFileInfoPrivate())
{
    d_ptr->initFileEngine(dir.filePath(file));
}

/*!
    Constructs a new QFileInfo that is a copy of the given \a fileinfo.
*/

QFileInfo::QFileInfo(const QFileInfo &fileinfo) : d_ptr(new QFileInfoPrivate(&fileinfo))
{

}

/*!
    Destroys the QFileInfo and frees its resources.
*/


QFileInfo::~QFileInfo()
{
    delete d_ptr;
    d_ptr = 0;
}

/*!
    \fn bool QFileInfo::operator!=(const QFileInfo &fileinfo)

    Returns true if this QFileInfo object refers to a different file
    than the one specified by \a fileinfo; otherwise returns false.

    \sa operator==()
*/

/*!
    \overload
    \fn bool QFileInfo::operator!=(const QFileInfo &fileinfo) const
*/

/*!
    \overload
*/

bool
QFileInfo::operator==(const QFileInfo &fileinfo) const
{
    Q_D(const QFileInfo);
    // ### Qt 5: understand long and short file names on Windows
    // ### (GetFullPathName()).
    if(fileinfo.d_func()->data == d->data)
        return true;
    if(!d->data->fileEngine || !fileinfo.d_func()->data->fileEngine)
        return false;
    if(d->data->fileEngine->caseSensitive() != fileinfo.d_func()->data->fileEngine->caseSensitive())
        return false;
    if(fileinfo.size() == size()) { //if the size isn't the same...
        QString file1 = absoluteFilePath(),
                file2 = fileinfo.absoluteFilePath();
        if(file1.length() == file2.length()) {
            if(!fileinfo.d_func()->data->fileEngine->caseSensitive()) {
                for(int i = 0; i < file1.length(); i++) {
                    if(file1.at(i).toLower() != file2.at(i).toLower())
                        return false;
                }
                return true;
            }
            return (file1 == file2);
        }
    }
    return false;
}

/*!
    Returns true if this QFileInfo object refers to a file in the same
    location as \a fileinfo; otherwise returns false.

    Note that the result of comparing two empty QFileInfo objects,
    containing no file references, is undefined.

    \warning This will not compare two different symbolic links
    pointing to the same file.

    \warning Long and short file names that refer to the same file on Windows
    are treated as if they referred to different files.

    \sa operator!=()
*/
bool QFileInfo::operator==(const QFileInfo &fileinfo)
{
    return const_cast<const QFileInfo *>(this)->operator==(fileinfo);
}

/*!
    Makes a copy of the given \a fileinfo and assigns it to this QFileInfo.
*/

QFileInfo &QFileInfo::operator=(const QFileInfo &fileinfo)
{
    Q_D(QFileInfo);
    qAtomicAssign(d->data, fileinfo.d_func()->data);
    return *this;
}

/*!
    Sets the file that the QFileInfo provides information about to \a
    file.

    The \a file can also include an absolute or relative file path.
    Absolute paths begin with the directory separator (e.g. "/" under
    Unix) or a drive specification (under Windows). Relative file
    names begin with a directory name or a file name and specify a
    path relative to the current directory.

    Example:
    \code
    QString absolute = "/local/bin";
    QString relative = "local/bin";
    QFileInfo absFile(absolute);
    QFileInfo relFile(relative);

    QDir::setCurrent(QDir::rootPath());
    // absFile and relFile now point to the same file

    QDir::setCurrent("/tmp");
    // absFile now points to "/local/bin",
    // while relFile points to "/tmp/local/bin"
    \endcode

    \sa isRelative(), QDir::setCurrent(), QDir::isRelativePath()
*/

void
QFileInfo::setFile(const QString &file)
{
    Q_D(QFileInfo);
    d->initFileEngine(file);
}

/*!
    \overload

    Sets the file that the QFileInfo provides information about to \a
    file.

    If \a file includes a relative path, the QFileInfo will also have
    a relative path.

    \sa isRelative()
*/

void
QFileInfo::setFile(const QFile &file)
{
    Q_D(QFileInfo);
    d->initFileEngine(file.fileName());
}

/*!
    \overload

    Sets the file that the QFileInfo provides information about to \a
    file in directory \a dir.

    If \a file includes a relative path, the QFileInfo will also
    have a relative path.

    \sa isRelative()
*/

void
QFileInfo::setFile(const QDir &dir, const QString &file)
{
    Q_D(QFileInfo);
    d->initFileEngine(dir.filePath(file));
}

/*!
    Returns the absolute path including the file name.

    The absolute path name consists of the full path and the file
    name. On Unix this will always begin with the root, '/',
    directory. On Windows this will always begin 'D:/' where D is a
    drive letter, except for network shares that are not mapped to a
    drive letter, in which case the path will begin '//sharename/'.

    This function returns the same as filePath(), unless isRelative()
    is true.

    If the QFileInfo is empty it returns QDir::currentPath().

    This function can be time consuming under Unix (in the order of
    milliseconds).

    \sa isRelative(), filePath()
*/

QString
QFileInfo::absoluteFilePath() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::AbsoluteName);
}

/*!
    Returns the canonical path, i.e. a path without symbolic links or
    redundant "." or ".." elements.

    On systems that do not have symbolic links this function will
    always return the same string that absoluteFilePath() returns. If
    the canonical path does not exist (normally due to dangling
    symbolic links) canonicalFilePath() returns an empty string.

    \sa filePath(), absoluteFilePath()
*/

QString
QFileInfo::canonicalFilePath() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::CanonicalName);
}


/*!
    Returns the file's path absolute path. This doesn't include the
    file name.

    \sa dir(), filePath(), fileName(), isRelative(), path()
*/

QString
QFileInfo::absolutePath() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::AbsolutePathName);
}

/*!
    Returns the canonical path, i.e. a path without symbolic links or
    redundant "." or ".." elements.

    On systems that do not have symbolic links this function will
    always return the same string that absolutePath() returns. If the
    canonical path does not exist (normally due to dangling symbolic
    links) canonicalPath() returns an empty string.

    \sa absolutePath()
*/

QString
QFileInfo::canonicalPath() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::CanonicalPathName);
}


/*!
    Returns the file's path. This doesn't include the file name.

    \sa dir(), filePath(), fileName(), isRelative(), absolutePath()
*/

QString
QFileInfo::path() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::PathName);
}

/*!
    \fn bool QFileInfo::isAbsolute() const

    Returns true if the file path name is absolute, otherwise returns
    false if the path is relative.

    \sa isRelative()
*/

/*!
    Returns true if the file path name is relative, otherwise returns
    false if the path is absolute (e.g. under Unix a path is absolute
    if it begins with a "/").

    \sa isAbsolute()
*/

bool
QFileInfo::isRelative() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return true;
    return d->data->fileEngine->isRelativePath();
}


/*!
    Converts the file's path to an absolute path if it is not already in that form.
    Returns true to indicate that the path was converted; otherwise returns false
    to indicate that the path was already absolute.

    \sa filePath(), isRelative()
*/

bool
QFileInfo::makeAbsolute()
{
    Q_D(QFileInfo);
    if(!d->data->fileEngine || !d->data->fileEngine->isRelativePath())
        return false;
    QString absFileName = d->getFileName(QAbstractFileEngine::AbsoluteName);
    d->initFileEngine(absFileName);
    return true;
}

/*!
    Returns true if the file exists; otherwise returns false.
*/

bool
QFileInfo::exists() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->getFileFlags(QAbstractFileEngine::ExistsFlag);
}

/*!
    Refreshes the information about the file, i.e. reads in information
    from the file system the next time a cached property is fetched.
*/

void
QFileInfo::refresh()
{
    Q_D(QFileInfo);
    d->reset();
}

/*!
    Returns the file name, including the path (which may be absolute
    or relative).

    \sa isRelative(), absoluteFilePath()
*/

QString
QFileInfo::filePath() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::DefaultName);
}

/*!
    Returns the name of the file, excluding the path.

    Example:
    \code
        QFileInfo fi("/tmp/archive.tar.gz");
        QString name = fi.fileName();                // name = "archive.tar.gz"
    \endcode

    \sa isRelative(), filePath(), baseName(), extension()
*/

QString
QFileInfo::fileName() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::BaseName);
}

/*!
    Returns the base name of the file without the path.

    The base name consists of all characters in the file up to (but
    not including) the \e first '.' character.

    Example:
    \code
        QFileInfo fi("/tmp/archive.tar.gz");
        QString base = fi.baseName();  // base = "archive"
    \endcode


    The base name of a file is computed equally on all platforms, independent
    of file naming conventions (e.g., ".bashrc" on Unix has an empty base
    name, and the suffix is "bashrc").

    \sa fileName(), suffix(), completeSuffix(), completeBaseName()
*/

QString
QFileInfo::baseName() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::BaseName).section(QLatin1Char('.'), 0, 0);
}

/*!
    Returns the complete base name of the file without the path.

    The complete base name consists of all characters in the file up
    to (but not including) the \e last '.' character.

    Example:
    \code
        QFileInfo fi("/tmp/archive.tar.gz");
        QString base = fi.completeBaseName();  // base = "archive.tar"
    \endcode

    \sa fileName(), suffix(), completeSuffix(), baseName()
*/

QString
QFileInfo::completeBaseName() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    QString name = d->getFileName(QAbstractFileEngine::BaseName);
    int index = name.lastIndexOf(QLatin1Char('.'));
    return (index == -1) ? name : name.left(index);
}

/*!
    Returns the complete suffix of the file.

    The complete suffix consists of all characters in the file after
    (but not including) the first '.'.

    Example:
    \code
        QFileInfo fi("/tmp/archive.tar.gz");
        QString ext = fi.completeSuffix();  // ext = "tar.gz"
    \endcode

    \sa fileName(), suffix(), baseName(), completeBaseName()
*/

QString
QFileInfo::completeSuffix() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    QString fileName = d->getFileName(QAbstractFileEngine::BaseName);
    int firstDot = fileName.indexOf(QLatin1Char('.'));
    if (firstDot == -1)
        return QLatin1String("");
    return fileName.mid(firstDot + 1);
}

/*!
    Returns the suffix of the file.

    The suffix consists of all characters in the file after (but not
    including) the last '.'.

    Example:
    \code
        QFileInfo fi("/tmp/archive.tar.gz");
        QString ext = fi.suffix();  // ext = "gz"
    \endcode

    The suffix of a file is computed equally on all platforms, independent of
    file naming conventions (e.g., ".bashrc" on Unix has an empty base name,
    and the suffix is "bashrc").

    \sa fileName(), completeSuffix(), baseName(), completeBaseName()
*/

QString
QFileInfo::suffix() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    QString fileName = d->getFileName(QAbstractFileEngine::BaseName);
    int lastDot = fileName.lastIndexOf(QLatin1Char('.'));
    if (lastDot == -1)
        return QLatin1String("");
    return fileName.mid(lastDot + 1);
}


/*!
    Returns the path of the object's parent directory as a QDir object.

    \bold{Note:} The QDir returned always corresponds to the object's parent
    directory, even if the QFileInfo represents a directory.

    \sa dirPath(), filePath(), fileName(), isRelative(), absoluteDir()
*/

QDir
QFileInfo::dir() const
{
    return QDir(path());
}

/*!
    Returns the file's absolute path as a QDir object.

    \sa filePath(), fileName(), isRelative(), dir()
*/

QDir
QFileInfo::absoluteDir() const
{
    return QDir(absolutePath());
}

#ifdef QT3_SUPPORT
/*!
    Use absoluteDir() or the dir() overload that takes no parameters
    instead.
*/
QDir QFileInfo::dir(bool absPath) const
{
    if(absPath)
        return absoluteDir();
    return dir();
}
#endif //QT3_SUPPORT

/*!
    Returns true if the user can read the file; otherwise returns false.

    \sa isWritable(), isExecutable(), permission()
*/

bool
QFileInfo::isReadable() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->hasAccess(QFileInfoPrivate::ReadAccess);
}

/*!
    Returns true if the user can write to the file; otherwise returns false.

    \sa isReadable(), isExecutable(), permission()
*/


bool
QFileInfo::isWritable() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->hasAccess(QFileInfoPrivate::WriteAccess);
}

/*!
    Returns true if the file is executable; otherwise returns false.

    \sa isReadable(), isWritable(), permission()
*/

bool
QFileInfo::isExecutable() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->hasAccess(QFileInfoPrivate::ExecuteAccess);
}

/*!
    Returns true if this is a `hidden' file; otherwise returns false.
*/
bool
QFileInfo::isHidden() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->getFileFlags(QAbstractFileEngine::HiddenFlag);
}

/*!
    Returns true if this object points to a file or to a symbolic
    link to a file. Returns false if the
    object points to something which isn't a file, such as a directory.

    \sa isDir(), isSymLink()
*/

bool
QFileInfo::isFile() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->getFileFlags(QAbstractFileEngine::FileType);
}

/*!
    Returns true if this object points to a directory or to a symbolic
    link to a directory; otherwise returns false.

    \sa isFile(), isSymLink()
*/

bool
QFileInfo::isDir() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->getFileFlags(QAbstractFileEngine::DirectoryType);
}

/*!
    Returns true if this object points to a symbolic link (or to a
    shortcut on Windows); otherwise returns false.

    On Unix (including Mac OS X), opening a symlink effectively opens
    the \l{symLinkTarget()}{link's target}. On Windows, it opens the \c
    .lnk file itself.

    Example:

    \code
        QFileInfo info(fileName);
        if (info.isSymLink())
            fileName = info.symLinkTarget();
    \endcode

    \sa isFile(), isDir(), symLinkTarget()
*/

bool
QFileInfo::isSymLink() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->getFileFlags(QAbstractFileEngine::LinkType);
}

/*!
  Returns true if the object points to a directory or to a symbolic
  link to a directory, and that directory is the root directory; otherwise
  returns false.
*/

bool
QFileInfo::isRoot() const
{
    Q_D(const QFileInfo);
    if (!d->data->fileEngine)
        return true;
    return d->getFileFlags(QAbstractFileEngine::RootFlag);
}

/*!
    \fn QString QFileInfo::symLinkTarget() const
    \since 4.2

    Returns the absolute path to the file or directory a symlink (or shortcut
    on Windows) points to, or a an empty string if the object isn't a symbolic
    link.

    This name may not represent an existing file; it is only a string.
    QFileInfo::exists() returns true if the symlink points to an
    existing file.

    \sa exists(), isSymLink(), isDir(), isFile()
*/

/*!
    \obsolete

    Use symLinkTarget() instead.
*/
QString
QFileInfo::readLink() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->getFileName(QAbstractFileEngine::LinkName);
}

/*!
    Returns the owner of the file. On systems where files
    do not have owners, or if an error occurs, an empty string is
    returned.

    This function can be time consuming under Unix (in the order of
    milliseconds).

    \sa ownerId(), group(), groupId()
*/

QString
QFileInfo::owner() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->data->fileEngine->owner(QAbstractFileEngine::OwnerUser);
}

/*!
    Returns the id of the owner of the file.

    On Windows and on systems where files do not have owners this
    function returns ((uint) -2).

    \sa owner(), group(), groupId()
*/

uint
QFileInfo::ownerId() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return 0;
    return d->data->fileEngine->ownerId(QAbstractFileEngine::OwnerUser);
}

/*!
    Returns the group of the file. On Windows, on systems where files
    do not have groups, or if an error occurs, an empty string is
    returned.

    This function can be time consuming under Unix (in the order of
    milliseconds).

    \sa groupId(), owner(), ownerId()
*/

QString
QFileInfo::group() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QLatin1String("");
    return d->data->fileEngine->owner(QAbstractFileEngine::OwnerGroup);
}

/*!
    Returns the id of the group the file belongs to.

    On Windows and on systems where files do not have groups this
    function always returns (uint) -2.

    \sa group(), owner(), ownerId()
*/

uint
QFileInfo::groupId() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return 0;
    return d->data->fileEngine->ownerId(QAbstractFileEngine::OwnerGroup);
}

/*!
    Tests for file permissions. The \a permissions argument can be
    several flags of type QFile::Permissions OR-ed together to check
    for permission combinations.

    On systems where files do not have permissions this function
    always returns true.

    Example:
    \code
        QFileInfo fi("/tmp/archive.tar.gz");
        if (fi.permission(QFile::WriteUser | QFile::ReadGroup))
            qWarning("I can change the file; my group can read the file");
        if (fi.permission(QFile::WriteGroup | QFile::WriteOther))
            qWarning("The group or others can change the file");
    \endcode

    \sa isReadable(), isWritable(), isExecutable()
*/

bool
QFileInfo::permission(QFile::Permissions permissions) const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return false;
    return d->getFileFlags(QAbstractFileEngine::FileFlags((int)permissions)) == (uint)permissions;
}

/*!
    Returns the complete OR-ed together combination of
    QFile::Permissions for the file.
*/

QFile::Permissions
QFileInfo::permissions() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return 0;
    return QFile::Permissions(d->getFileFlags(QAbstractFileEngine::PermsMask) & QAbstractFileEngine::PermsMask);
}


/*!
    Returns the file size in bytes. If the file does not exist or cannot be
    fetched, 0 is returned.

    \sa exists()
*/

qint64
QFileInfo::size() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return 0;
    if(!d->data->getCachedFlag(QFileInfoPrivate::CachedSize)) {
        d->data->setCachedFlag(QFileInfoPrivate::CachedSize);
        d->data->fileSize = d->data->fileEngine->size();
    }
    return d->data->fileSize;
}

/*!
    Returns the date and time when the file was created.

    On most Unix systems, this function returns the time of the last
    status change. A status change occurs when the file is created,
    but it also occurs whenever the user writes or sets inode
    information (for example, changing the file permissions).

    If neither creation time nor "last status change" time are not
    available, returns the same as lastModified().

    \sa lastModified() lastRead()
*/

QDateTime
QFileInfo::created() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QDateTime();
    return d->getFileTime(QAbstractFileEngine::CreationTime);
}

/*!
    Returns the date and time when the file was last modified.

    \sa created() lastRead()
*/

QDateTime
QFileInfo::lastModified() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QDateTime();
    return d->getFileTime(QAbstractFileEngine::ModificationTime);
}

/*!
    Returns the date and time when the file was last read (accessed).

    On platforms where this information is not available, returns the
    same as lastModified().

    \sa created() lastModified()
*/

QDateTime
QFileInfo::lastRead() const
{
    Q_D(const QFileInfo);
    if(!d->data->fileEngine)
        return QDateTime();
    return d->getFileTime(QAbstractFileEngine::AccessTime);
}

/*! \internal
    Detaches all internal data.
*/

void
QFileInfo::detach()
{
    Q_D(QFileInfo);
    d->detach();
}

/*!
    Returns true if caching is enabled; otherwise returns false.

    \sa setCaching(), refresh()
*/

bool QFileInfo::caching() const
{
    Q_D(const QFileInfo);
    return d->data->cache_enabled;
}

/*!
    If \a enable is true, enables caching of file information. If \a
    enable is false caching is disabled.

    When caching is enabled, QFileInfo reads the file information from
    the file system the first time it's needed, but generally not
    later.

    Caching is enabled by default.

    \sa refresh(), caching()
*/

void
QFileInfo::setCaching(bool enable)
{
    Q_D(QFileInfo);
    detach();
    d->data->cache_enabled = enable;
}

/*!
    \fn QString QFileInfo::baseName(bool complete)

    Use completeBaseName() or the baseName() overload that takes no
    parameters instead.
*/

/*!
    \fn QString QFileInfo::extension(bool complete = true) const

    Use completeSuffix() or suffix() instead.
*/

/*!
    \fn QString QFileInfo::absFilePath() const

    Use absoluteFilePath() instead.
*/

/*!
    \fn bool QFileInfo::convertToAbs()

    Use makeAbsolute() instead.
*/

/*!
    \enum QFileInfo::Permission

    \compat

    \value ReadOwner
    \value WriteOwner
    \value ExeOwner
    \value ReadUser
    \value WriteUser
    \value ExeUser
    \value ReadGroup
    \value WriteGroup
    \value ExeGroup
    \value ReadOther
    \value WriteOther
    \value ExeOther
*/

/*!
    \fn bool QFileInfo::permission(PermissionSpec permissions) const
    \compat

    Use permission() instead.
*/

/*!
    \typedef QFileInfoList
    \relates QFileInfo

    Synonym for QList<QFileInfo>.
*/
