qfsfileengine_unix.cpp

奇趣公司比较新的qt/emd版本

QString QFSFileEngine::tempPath()
{
    QString temp = QFile::decodeName(qgetenv("TMPDIR"));
    if (temp.isEmpty())
        temp = QString::fromLatin1("/tmp/");
    return temp;
}

QFileInfoList QFSFileEngine::drives()
{
    QFileInfoList ret;
    ret.append(rootPath());
    return ret;
}

bool QFSFileEnginePrivate::doStat() const
{
    if (tried_stat == 0) {
        QFSFileEnginePrivate *that = const_cast<QFSFileEnginePrivate*>(this);
        if (fh && nativeFilePath.isEmpty()) {
            // ### actually covers two cases: d->fh and when the file is not open
            that->could_stat = (QT_FSTAT(fileno(fh), &st) == 0);
        } else if (fd == -1) {
            // ### actually covers two cases: d->fh and when the file is not open
            that->could_stat = (QT_STAT(nativeFilePath.constData(), &st) == 0);
        } else {
            that->could_stat = (QT_FSTAT(fd, &st) == 0);
        }
	that->tried_stat = 1;
    }
    return could_stat;
}

bool QFSFileEnginePrivate::isSymlink() const
{
    if (need_lstat) {
        QFSFileEnginePrivate *that = const_cast<QFSFileEnginePrivate *>(this);
        that->need_lstat = false;
        QT_STATBUF st;          // don't clobber our main one
        that->is_link = (QT_LSTAT(nativeFilePath.constData(), &st) == 0) ? S_ISLNK(st.st_mode) : false;
    }
    return is_link;
}

#if !defined(QWS) && defined(Q_OS_MAC)
static bool _q_isMacHidden(const QString &path)
{
    OSErr err = noErr;

    FSRef fsRef;

#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4)
    if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_4) {
        err = FSPathMakeRefWithOptions(reinterpret_cast<const UInt8 *>(QFile::encodeName(path).constData()),
                                        kFSPathMakeRefDoNotFollowLeafSymlink, &fsRef, 0);
    } else
#endif
    {
        QFileInfo fi(path);
        FSRef parentRef;
        err = FSPathMakeRef(reinterpret_cast<const UInt8 *>(fi.absoluteDir().canonicalPath().toUtf8().constData()),
                            &parentRef, 0);
        if (err == noErr) {
            QString fileName = fi.fileName();
            err = FSMakeFSRefUnicode(&parentRef, fileName.length(),
                                     reinterpret_cast<const UniChar *>(fileName.unicode()),
                                     kTextEncodingUnknown, &fsRef);
        }
    }
    if (err != noErr)
        return false;

    FSCatalogInfo catInfo;
    err = FSGetCatalogInfo(&fsRef, kFSCatInfoFinderInfo, &catInfo, NULL, NULL, NULL);
    if (err != noErr)
        return false;

    FileInfo * const fileInfo = reinterpret_cast<FileInfo*>(&catInfo.finderInfo);
    bool result = (fileInfo->finderFlags & kIsInvisible);
    return result;
}
#endif

/*!
    \reimp
*/
QAbstractFileEngine::FileFlags QFSFileEngine::fileFlags(FileFlags type) const
{
    Q_D(const QFSFileEngine);
    // Force a stat, so that we're guaranteed to get up-to-date results
    if (type & QAbstractFileEngine::FileFlag(QAbstractFileEngine::Refresh)) {
        d->tried_stat = 0;
        d->need_lstat = 1;
    }

    QAbstractFileEngine::FileFlags ret = 0;
    bool exists = d->doStat();
    if (!exists && !d->isSymlink())
        return ret;

    if (exists && (type & PermsMask)) {
        if (d->st.st_mode & S_IRUSR)
            ret |= ReadOwnerPerm;
        if (d->st.st_mode & S_IWUSR)
            ret |= WriteOwnerPerm;
        if (d->st.st_mode & S_IXUSR)
            ret |= ExeOwnerPerm;
        if (d->st.st_mode & S_IRUSR)
            ret |= ReadUserPerm;
        if (d->st.st_mode & S_IWUSR)
            ret |= WriteUserPerm;
        if (d->st.st_mode & S_IXUSR)
            ret |= ExeUserPerm;
        if (d->st.st_mode & S_IRGRP)
            ret |= ReadGroupPerm;
        if (d->st.st_mode & S_IWGRP)
            ret |= WriteGroupPerm;
        if (d->st.st_mode & S_IXGRP)
            ret |= ExeGroupPerm;
        if (d->st.st_mode & S_IROTH)
            ret |= ReadOtherPerm;
        if (d->st.st_mode & S_IWOTH)
            ret |= WriteOtherPerm;
        if (d->st.st_mode & S_IXOTH)
            ret |= ExeOtherPerm;
    }
    if (type & TypesMask) {
#if !defined(QWS) && defined(Q_OS_MAC)
        bool foundAlias = false;
        {
            FSRef fref;
            if (FSPathMakeRef((const UInt8 *)QFile::encodeName(QDir::cleanPath(d->filePath)).data(),
                             &fref, NULL) == noErr) {
                Boolean isAlias, isFolder;
                if (FSIsAliasFile(&fref, &isAlias, &isFolder) == noErr && isAlias) {
                    foundAlias = true;
                    ret |= LinkType;
                }
            }
        }
        if (!foundAlias)
#endif
        {
            if ((type & LinkType) && d->isSymlink())
                ret |= LinkType;
            if (exists && (d->st.st_mode & S_IFMT) == S_IFREG)
                ret |= FileType;
            else if (exists && (d->st.st_mode & S_IFMT) == S_IFDIR)
                ret |= DirectoryType;
#if !defined(QWS) && defined(Q_OS_MAC)
            if((ret & DirectoryType) && (type & BundleType)) {
                QCFType<CFURLRef> url = CFURLCreateWithFileSystemPath(0, QCFString(d->filePath),
                                                                      kCFURLPOSIXPathStyle, true);
                UInt32 type, creator;
                if(CFBundleGetPackageInfoInDirectory(url, &type, &creator))
                    ret |= BundleType;
            }
#endif
        }
    }
    if (type & FlagsMask) {
        ret |= LocalDiskFlag;
        if (exists)
            ret |= ExistsFlag;
        if (fileName(BaseName)[0] == QLatin1Char('.')
#if !defined(QWS) && defined(Q_OS_MAC)
            || _q_isMacHidden(d->filePath)
#endif
        )
            ret |= HiddenFlag;
        if (d->filePath == QLatin1String("/"))
            ret |= RootFlag;
    }
    return ret;
}

QString QFSFileEngine::fileName(FileName file) const
{
    Q_D(const QFSFileEngine);
    if (file == BundleName) {
#if !defined(QWS) && defined(Q_OS_MAC)
        QCFType<CFURLRef> url = CFURLCreateWithFileSystemPath(0, QCFString(d->filePath),
                                                              kCFURLPOSIXPathStyle, true);
        if(CFDictionaryRef dict = CFBundleCopyInfoDictionaryForURL(url)) {
            if(CFTypeRef name = (CFTypeRef)CFDictionaryGetValue(dict, kCFBundleNameKey)) {
                if(CFGetTypeID(name) == CFStringGetTypeID())
                    return QCFString::toQString((CFStringRef)name);
            }
        }
#endif
        return QString();
    } else if (file == BaseName) {
        int slash = d->filePath.lastIndexOf(QLatin1Char('/'));
        if (slash != -1)
            return d->filePath.mid(slash + 1);
    } else if (file == PathName) {
        int slash = d->filePath.lastIndexOf(QLatin1Char('/'));
        if (slash == -1)
            return QLatin1String(".");
        else if (!slash)
            return QLatin1String("/");
        return d->filePath.left(slash);
    } else if (file == AbsoluteName || file == AbsolutePathName) {
        QString ret;
        if (d->filePath.isEmpty() || !d->filePath.startsWith(QLatin1Char('/')))
            ret = QDir::currentPath();
        if (!d->filePath.isEmpty() && d->filePath != QLatin1String(".")) {
            if (!ret.isEmpty() && !ret.endsWith(QLatin1Char('/')))
                ret += QLatin1Char('/');
            ret += d->filePath;
        }
        if (ret == QLatin1String("/"))
            return ret;
        bool isDir = ret.endsWith(QLatin1Char('/'));
        ret = QDir::cleanPath(ret);
        if (isDir)
            ret += QLatin1String("/");
        if (file == AbsolutePathName) {
            int slash = ret.lastIndexOf(QLatin1Char('/'));
            if (slash == -1)
                return QDir::currentPath();
            else if (!slash)
                return QLatin1String("/");
            return ret.left(slash);
        }
        return ret;
    } else if (file == CanonicalName || file == CanonicalPathName) {
#if defined(__GLIBC__) && !defined(PATH_MAX)
      char *cur = ::get_current_dir_name();
      if (cur) {
	QString ret;
	char *tmp = ::canonicalize_file_name(d->nativeFilePath.constData());
	if (tmp) {
	  ret = QFile::decodeName(tmp);
	  ::free(tmp);
	}
	::chdir(cur); // always make sure we go back to the current dir
	::free(cur);
#else
        char cur[PATH_MAX+1];
        if (::getcwd(cur, PATH_MAX)) {
            QString ret;
#  ifndef Q_OS_INTEGRITY // INTEGRITY has no realpath
            char real[PATH_MAX+1];
            // need the cast for old solaris versions of realpath that doesn't take
            // a const char*.
            if (::realpath(d->nativeFilePath.constData(), real))
                ret = QFile::decodeName(QByteArray(real));
#  endif
            ::chdir(cur); // always make sure we go back to the current dir
#endif
            //check it
            QT_STATBUF st;
            if (QT_STAT(QFile::encodeName(ret), &st) != 0)
                ret = QString();
            if (!ret.isEmpty() && file == CanonicalPathName) {
                int slash = ret.lastIndexOf(QLatin1Char('/'));
                if (slash == -1)
                    return QDir::currentPath();
                else if (!slash)
                    return QLatin1String("/");
                return ret.left(slash);
            }
            return ret;
        }
        if (file == CanonicalPathName)
            return fileName(AbsolutePathName);
        return fileName(AbsoluteName);
    } else if (file == LinkName) {
        if (d->isSymlink()) {
#if defined(__GLIBC__) && !defined(PATH_MAX)
#define PATH_CHUNK_SIZE 256
            char *s = 0;
            int len = -1;
            int size = PATH_CHUNK_SIZE;

            while (1) {
                s = (char *) ::realloc(s, size);
                if (s == 0) {
                    len = -1;
                    break;
                }
                len = ::readlink(d->nativeFilePath.constData(), s, size);
                if (len < 0) {
                    ::free(s);
                    break;
                }
                if (len < size) {
                    break;
                }
                size *= 2;
            }
#else
            char s[PATH_MAX+1];
            int len = readlink(d->nativeFilePath.constData(), s, PATH_MAX);
#endif
            if (len > 0) {
                QString ret;
                if (S_ISDIR(d->st.st_mode) && s[0] != '/') {
                    QDir parent(d->filePath);
                    parent.cdUp();
                    ret = parent.path();
                    if (!ret.isEmpty() && !ret.endsWith(QLatin1Char('/')))
                        ret += QLatin1Char('/');
                }
                s[len] = '\0';
                ret += QFile::decodeName(QByteArray(s));
#if defined(__GLIBC__) && !defined(PATH_MAX)
		::free(s);
#endif

                if (!ret.startsWith(QLatin1Char('/'))) {
                    if (d->filePath.startsWith(QLatin1Char('/'))) {
                        ret.prepend(d->filePath.left(d->filePath.lastIndexOf(QLatin1Char('/')))
                                    + QLatin1Char('/'));
                    } else {
                        ret.prepend(QDir::currentPath() + QLatin1Char('/'));
                    }
                }
                ret = QDir::cleanPath(ret);
                if (ret.size() > 1 && ret.endsWith(QLatin1Char('/')))
                    ret.chop(1);
                return ret;
            }
        }
#if !defined(QWS) && defined(Q_OS_MAC)
        {
            FSRef fref;
            if (FSPathMakeRef((const UInt8 *)QFile::encodeName(QDir::cleanPath(d->filePath)).data(), &fref, 0) == noErr) {
                Boolean isAlias, isFolder;
                if (FSResolveAliasFile(&fref, true, &isFolder, &isAlias) == noErr && isAlias) {
                    AliasHandle alias;
                    if (FSNewAlias(0, &fref, &alias) == noErr && alias) {
                        CFStringRef cfstr;
                        if (FSCopyAliasInfo(alias, 0, 0, &cfstr, 0, 0) == noErr)
                            return QCFString::toQString(cfstr);
                    }
                }
            }
        }
#endif
        return QString();
    }
    return d->filePath;
}

bool QFSFileEngine::isRelativePath() const
{
    Q_D(const QFSFileEngine);
    int len = d->filePath.length();
    if (len == 0)
        return true;
    return d->filePath[0] != QLatin1Char('/');
}

uint QFSFileEngine::ownerId(FileOwner own) const
{
    Q_D(const QFSFileEngine);
    static const uint nobodyID = (uint) -2;
    if (d->doStat()) {
        if (own == OwnerUser)
            return d->st.st_uid;
        else
            return d->st.st_gid;
    }
    return nobodyID;
}

QString QFSFileEngine::owner(FileOwner own) const
{
#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_OPENBSD)
    QVarLengthArray<char, 1024> buf(sysconf(_SC_GETPW_R_SIZE_MAX));
#endif

    if (own == OwnerUser) {
        struct passwd *pw = 0;
#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_OPENBSD)
        struct passwd entry;
        getpwuid_r(ownerId(own), &entry, buf.data(), buf.size(), &pw);
#else
        pw = getpwuid(ownerId(own));
#endif
        if (pw)
            return QFile::decodeName(QByteArray(pw->pw_name));
    } else if (own == OwnerGroup) {
        struct group *gr = 0;
#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_OPENBSD)
        buf.resize(sysconf(_SC_GETGR_R_SIZE_MAX));
        struct group entry;
        getgrgid_r(ownerId(own), &entry, buf.data(), buf.size(), &gr);
#else
        gr = getgrgid(ownerId(own));
#endif
        if (gr)
            return QFile::decodeName(QByteArray(gr->gr_name));
    }
    return QString();
}

bool QFSFileEngine::setPermissions(uint perms)
{
    Q_D(QFSFileEngine);
    mode_t mode = 0;
    if (perms & ReadOwnerPerm)
        mode |= S_IRUSR;
    if (perms & WriteOwnerPerm)
        mode |= S_IWUSR;
    if (perms & ExeOwnerPerm)
        mode |= S_IXUSR;
    if (perms & ReadUserPerm)
        mode |= S_IRUSR;
    if (perms & WriteUserPerm)
        mode |= S_IWUSR;
    if (perms & ExeUserPerm)
        mode |= S_IXUSR;
    if (perms & ReadGroupPerm)
        mode |= S_IRGRP;
    if (perms & WriteGroupPerm)
        mode |= S_IWGRP;
    if (perms & ExeGroupPerm)
        mode |= S_IXGRP;
    if (perms & ReadOtherPerm)
        mode |= S_IROTH;
    if (perms & WriteOtherPerm)
        mode |= S_IWOTH;
    if (perms & ExeOtherPerm)
        mode |= S_IXOTH;
    if (d->fd != -1)
        return !fchmod(d->fd, mode);
    return !::chmod(d->nativeFilePath.constData(), mode);
}

bool QFSFileEngine::setSize(qint64 size)
{
    Q_D(QFSFileEngine);
    if (d->fd != -1)
        return !QT_FTRUNCATE(d->fd, size);
    return !QT_TRUNCATE(d->nativeFilePath.constData(), size);
}

QDateTime QFSFileEngine::fileTime(FileTime time) const
{
    Q_D(const QFSFileEngine);
    QDateTime ret;
    if (d->doStat()) {
        if (time == CreationTime)
            ret.setTime_t(d->st.st_ctime ? d->st.st_ctime : d->st.st_mtime);
        else if (time == ModificationTime)
            ret.setTime_t(d->st.st_mtime);
        else if (time == AccessTime)
            ret.setTime_t(d->st.st_atime);
    }
    return ret;
}