source: trunk/src/corelib/io/qfileinfo.cpp@ 595

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#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"
#include "qfileinfo_p.h"

QT_BEGIN_NAMESPACE

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

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 (!(getFileFlags(QAbstractFileEngine::FileInfoAll) & 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_OS2
    if ((access == ReadAccess && !getFileFlags(QAbstractFileEngine::ReadUserPerm))
        || (access == WriteAccess && !getFileFlags(QAbstractFileEngine::WriteUserPerm))) {
        return false;
    }
    if (access == ExecuteAccess)
        return getFileFlags(QAbstractFileEngine::ExeUserPerm);

    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);

    return ::_waccess((wchar_t*)QFSFileEnginePrivate::longFileName(data->fileName).utf16(), mode) == 0;
#endif
    return false;
}

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

QString QFileInfoPrivate::getFileName(QAbstractFileEngine::FileName name) const
{
    if(data->cache_enabled && !data->fileNames[(int)name].isNull())
        return data->fileNames[(int)name];
    QString ret = data->fileEngine->fileName(name);
    if(data->cache_enabled)
        data->fileNames[(int)name] = ret;
    return ret;
}

uint QFileInfoPrivate::getFileFlags(QAbstractFileEngine::FileFlags request) const
{
    // We split the testing into tests for for LinkType, BundleType and the rest.
    // 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. Bundle detecton on Mac can be slow, expecially on network
    // paths, so we separate out that as well.

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

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