/ExtLibs/wxWidgets/src/common/filename.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        src/common/filename.cpp
// Purpose:     wxFileName - encapsulates a file path
// Author:      Robert Roebling, Vadim Zeitlin
// Modified by:
// Created:     28.12.2000
// Copyright:   (c) 2000 Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

/*
   Here are brief descriptions of the filename formats supported by this class:

   wxPATH_UNIX: standard Unix format, used under Darwin as well, absolute file
                names have the form:
                /dir1/dir2/.../dirN/filename, "." and ".." stand for the
                current and parent directory respectively, "~" is parsed as the
                user HOME and "~username" as the HOME of that user

   wxPATH_DOS:  DOS/Windows format, absolute file names have the form:
                drive:\dir1\dir2\...\dirN\filename.ext where drive is a single
                letter. "." and ".." as for Unix but no "~".

                There are also UNC names of the form \\share\fullpath and
                MSW unique volume names of the form \\?\Volume{GUID}\fullpath.

                The latter provide a uniform way to access a volume regardless of
                its current mount point, i.e. you can change a volume's mount
                point from D: to E:, or even remove it, and still be able to
                access it through its unique volume name. More on the subject can
                be found in MSDN's article "Naming a Volume" that is currently at
                http://msdn.microsoft.com/en-us/library/aa365248(VS.85).aspx.


   wxPATH_MAC:  Mac OS 8/9 only, not used any longer, absolute file
                names have the form
                    volume:dir1:...:dirN:filename
                and the relative file names are either
                    :dir1:...:dirN:filename
                or just
                    filename
                (although :filename works as well).
                Since the volume is just part of the file path, it is not
                treated like a separate entity as it is done under DOS and
                VMS, it is just treated as another dir.

   wxPATH_VMS:  VMS native format, absolute file names have the form
                    <device>:[dir1.dir2.dir3]file.txt
                or
                    <device>:[000000.dir1.dir2.dir3]file.txt

                the <device> is the physical device (i.e. disk). 000000 is the
                root directory on the device which can be omitted.

                Note that VMS uses different separators unlike Unix:
                 : always after the device. If the path does not contain : than
                   the default (the device of the current directory) is assumed.
                 [ start of directory specification
                 . separator between directory and subdirectory
                 ] between directory and file
 */

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #ifdef __WINDOWS__
        #include "wx/msw/wrapwin.h" // For GetShort/LongPathName
    #endif
    #include "wx/dynarray.h"
    #include "wx/intl.h"
    #include "wx/log.h"
    #include "wx/utils.h"
    #include "wx/crt.h"
#endif

#include "wx/filename.h"
#include "wx/private/filename.h"
#include "wx/tokenzr.h"
#include "wx/config.h"          // for wxExpandEnvVars
#include "wx/dynlib.h"
#include "wx/dir.h"
#include "wx/longlong.h"

#if defined(__WIN32__) && defined(__MINGW32__)
    #include "wx/msw/gccpriv.h"
#endif

#ifdef __WINDOWS__
    #include "wx/msw/private.h"
    #include <shlobj.h>         // for CLSID_ShellLink
    #include "wx/msw/missing.h"
#endif

#if defined(__WXMAC__)
  #include  "wx/osx/private.h"  // includes mac headers
#endif

// utime() is POSIX so should normally be available on all Unices
#ifdef __UNIX_LIKE__
#include <sys/types.h>
#include <utime.h>
#include <sys/stat.h>
#include <unistd.h>
#endif

#ifdef __DJGPP__
#include <unistd.h>
#endif

#ifdef __WATCOMC__
#include <io.h>
#include <sys/utime.h>
#include <sys/stat.h>
#endif

#ifdef __VISAGECPP__
#ifndef MAX_PATH
#define MAX_PATH 256
#endif
#endif

#ifdef __EMX__
#include <os2.h>
#define MAX_PATH _MAX_PATH
#endif

#ifndef S_ISREG
    #define S_ISREG(mode) ((mode) & S_IFREG)
#endif
#ifndef S_ISDIR
    #define S_ISDIR(mode) ((mode) & S_IFDIR)
#endif

#if wxUSE_LONGLONG
extern const wxULongLong wxInvalidSize = (unsigned)-1;
#endif // wxUSE_LONGLONG

namespace
{

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

// small helper class which opens and closes the file - we use it just to get
// a file handle for the given file name to pass it to some Win32 API function
#if defined(__WIN32__) && !defined(__WXMICROWIN__)

class wxFileHandle
{
public:
    enum OpenMode
    {
        ReadAttr,
        WriteAttr
    };

    wxFileHandle(const wxString& filename, OpenMode mode, int flags = 0)
    {
        // be careful and use FILE_{READ,WRITE}_ATTRIBUTES here instead of the
        // usual GENERIC_{READ,WRITE} as we don't want the file access time to
        // be changed when we open it because this class is used for setting
        // access time (see #10567)
        m_hFile = ::CreateFile
                    (
                     filename.t_str(),             // name
                     mode == ReadAttr ? FILE_READ_ATTRIBUTES    // access mask
                                      : FILE_WRITE_ATTRIBUTES,
                     FILE_SHARE_READ |              // sharing mode
                     FILE_SHARE_WRITE,              // (allow everything)
                     NULL,                          // no secutity attr
                     OPEN_EXISTING,                 // creation disposition
                     flags,                         // flags
                     NULL                           // no template file
                    );

        if ( m_hFile == INVALID_HANDLE_VALUE )
        {
            if ( mode == ReadAttr )
            {
                wxLogSysError(_("Failed to open '%s' for reading"),
                              filename.c_str());
            }
            else
            {
                wxLogSysError(_("Failed to open '%s' for writing"),
                              filename.c_str());
            }
        }
    }

    ~wxFileHandle()
    {
        if ( m_hFile != INVALID_HANDLE_VALUE )
        {
            if ( !::CloseHandle(m_hFile) )
            {
                wxLogSysError(_("Failed to close file handle"));
            }
        }
    }

    // return true only if the file could be opened successfully
    bool IsOk() const { return m_hFile != INVALID_HANDLE_VALUE; }

    // get the handle
    operator HANDLE() const { return m_hFile; }

private:
    HANDLE m_hFile;
};

#endif // __WIN32__

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

#if wxUSE_DATETIME && defined(__WIN32__) && !defined(__WXMICROWIN__)

// Convert between wxDateTime and FILETIME which is a 64-bit value representing
// the number of 100-nanosecond intervals since January 1, 1601 UTC.
//
// This is the offset between FILETIME epoch and the Unix/wxDateTime Epoch.
static wxInt64 EPOCH_OFFSET_IN_MSEC = wxLL(11644473600000);

static void ConvertFileTimeToWx(wxDateTime *dt, const FILETIME &ft)
{
    wxLongLong t(ft.dwHighDateTime, ft.dwLowDateTime);
    t /= 10000; // Convert hundreds of nanoseconds to milliseconds.
    t -= EPOCH_OFFSET_IN_MSEC;

    *dt = wxDateTime(t);
}

static void ConvertWxToFileTime(FILETIME *ft, const wxDateTime& dt)
{
    // Undo the conversions above.
    wxLongLong t(dt.GetValue());
    t += EPOCH_OFFSET_IN_MSEC;
    t *= 10000;

    ft->dwHighDateTime = t.GetHi();
    ft->dwLowDateTime = t.GetLo();
}

#endif // wxUSE_DATETIME && __WIN32__

// return a string with the volume par
static wxString wxGetVolumeString(const wxString& volume, wxPathFormat format)
{
    wxString path;

    if ( !volume.empty() )
    {
        format = wxFileName::GetFormat(format);

        // Special Windows UNC paths hack, part 2: undo what we did in
        // SplitPath() and make an UNC path if we have a drive which is not a
        // single letter (hopefully the network shares can't be one letter only
        // although I didn't find any authoritative docs on this)
        if ( format == wxPATH_DOS && volume.length() > 1 )
        {
            // We also have to check for Windows unique volume names here and
            // return it with '\\?\' prepended to it
            if ( wxFileName::IsMSWUniqueVolumeNamePath("\\\\?\\" + volume + "\\",
                                                       format) )
            {
                path << "\\\\?\\" << volume;
            }
            else
            {
                // it must be a UNC path
                path << wxFILE_SEP_PATH_DOS << wxFILE_SEP_PATH_DOS << volume;
            }
        }
        else if  ( format == wxPATH_DOS || format == wxPATH_VMS )
        {
            path << volume << wxFileName::GetVolumeSeparator(format);
        }
        // else ignore
    }

    return path;
}

// return true if the character is a DOS path separator i.e. either a slash or
// a backslash
inline bool IsDOSPathSep(wxUniChar ch)
{
    return ch == wxFILE_SEP_PATH_DOS || ch == wxFILE_SEP_PATH_UNIX;
}

// return true if the format used is the DOS/Windows one and the string looks
// like a UNC path
static bool IsUNCPath(const wxString& path, wxPathFormat format)
{
    return format == wxPATH_DOS &&
                path.length() >= 4 && // "\\a" can't be a UNC path
                    IsDOSPathSep(path[0u]) &&
                        IsDOSPathSep(path[1u]) &&
                            !IsDOSPathSep(path[2u]);
}

// Under Unix-ish systems (basically everything except Windows but we can't
// just test for non-__WIN32__ because Cygwin defines it, yet we want to use
// lstat() under it, so test for all the rest explicitly) we may work either
// with the file itself or its target if it's a symbolic link and we should
// dereference it, as determined by wxFileName::ShouldFollowLink() and the
// absence of the wxFILE_EXISTS_NO_FOLLOW flag. StatAny() can be used to stat
// the appropriate file with an extra twist that it also works when there is no
// wxFileName object at all, as is the case in static methods.

#if defined(__UNIX_LIKE__) || defined(__WXMAC__) || defined(__OS2__) || (defined(__DOS__) && defined(__WATCOMC__))
    #define wxHAVE_LSTAT
#endif

#ifdef wxHAVE_LSTAT

// Private implementation, don't call directly, use one of the overloads below.
bool DoStatAny(wxStructStat& st, wxString path, bool dereference)
{
    // We need to remove any trailing slashes from the path because they could
    // interfere with the symlink following decision: even if we use lstat(),
    // it would still follow the symlink if we pass it a path with a slash at
    // the end because the symlink resolution would happen while following the
    // path and not for the last path element itself.

    while ( wxEndsWithPathSeparator(path) )
    {
        const size_t posLast = path.length() - 1;
        if ( !posLast )
        {
            // Don't turn "/" into empty string.
            break;
        }

        path.erase(posLast);
    }

    int ret = dereference ? wxStat(path, &st) : wxLstat(path, &st);
    return ret == 0;
}

// Overloads to use for a case when we don't have wxFileName object and when we
// do have one.
inline
bool StatAny(wxStructStat& st, const wxString& path, int flags)
{
    return DoStatAny(st, path, !(flags & wxFILE_EXISTS_NO_FOLLOW));
}

inline
bool StatAny(wxStructStat& st, const wxFileName& fn)
{
    return DoStatAny(st, fn.GetFullPath(), fn.ShouldFollowLink());
}

#endif // wxHAVE_LSTAT

// ----------------------------------------------------------------------------
// private constants
// ----------------------------------------------------------------------------

// length of \\?\Volume{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}\ string
static const size_t wxMSWUniqueVolumePrefixLength = 49;

} // anonymous namespace

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// wxFileName construction
// ----------------------------------------------------------------------------

void wxFileName::Assign( const wxFileName &filepath )
{
    m_volume = filepath.GetVolume();
    m_dirs = filepath.GetDirs();
    m_name = filepath.GetName();
    m_ext = filepath.GetExt();
    m_relative = filepath.m_relative;
    m_hasExt = filepath.m_hasExt;
    m_dontFollowLinks = filepath.m_dontFollowLinks;
}

void wxFileName::Assign(const wxString& volume,
                        const wxString& path,
                        const wxString& name,
                        const wxString& ext,
                        bool hasExt,
                        wxPathFormat format)
{
    // we should ignore paths which look like UNC shares because we already
    // have the volume here and the UNC notation (\\server\path) is only valid
    // for paths which don't start with a volume, so prevent SetPath() from
    // recognizing "\\foo\bar" in "c:\\foo\bar" as an UNC path
    //
    // note also that this is a rather ugly way to do what we want (passing
    // some kind of flag telling to ignore UNC paths to SetPath() would be
    // better) but this is the safest thing to do to avoid breaking backwards
    // compatibility in 2.8
    if ( IsUNCPath(path, format) )
    {
        // remove one of the 2 leading backslashes to ensure that it's not
        // recognized as an UNC path by SetPath()
        wxString pathNonUNC(path, 1, wxString::npos);
        SetPath(pathNonUNC, format);
    }
    else // no UNC complications
    {
        SetPath(path, format);
    }

    m_volume = volume;
    m_ext = ext;
    m_name = name;

    m_hasExt = hasExt;
}

void wxFileName::SetPath( const wxString& pathOrig, wxPathFormat format )
{
    m_dirs.Clear();

    if ( pathOrig.empty() )
    {
        // no path at all
        m_relative = true;

        return;
    }

    format = GetFormat( format );

    // 0) deal with possible volume part first
    wxString volume,
             path;
    SplitVolume(pathOrig, &volume, &path, format);
    if ( !volume.empty() )
    {
        m_relative = false;

        SetVolume(volume);
    }

    // 1) Determine if the path is relative or absolute.

    if ( path.empty() )
    {
        // we had only the volume
        return;
    }

    wxChar leadingChar = path[0u];

    switch (format)
    {
        case wxPATH_MAC:
            m_relative = leadingChar == wxT(':');

            // We then remove a leading ":". The reason is in our
            // storage form for relative paths:
            // ":dir:file.txt" actually means "./dir/file.txt" in
            // DOS notation and should get stored as
            // (relative) (dir) (file.txt)
            // "::dir:file.txt" actually means "../dir/file.txt"
            // stored as (relative) (..) (dir) (file.txt)
            // This is important only for the Mac as an empty dir
            // actually means <UP>, whereas under DOS, double
            // slashes can be ignored: "\\\\" is the same as "\\".
            if (m_relative)
                path.erase( 0, 1 );
            break;

        case wxPATH_VMS:
            // TODO: what is the relative path format here?
            m_relative = false;
            break;

        default:
            wxFAIL_MSG( wxT("Unknown path format") );
            // !! Fall through !!

        case wxPATH_UNIX:
            m_relative = leadingChar != wxT('/');
            break;

        case wxPATH_DOS:
            m_relative = !IsPathSeparator(leadingChar, format);
            break;

    }

    // 2) Break up the path into its members. If the original path
    //    was just "/" or "\\", m_dirs will be empty. We know from
    //    the m_relative field, if this means "nothing" or "root dir".

    wxStringTokenizer tn( path, GetPathSeparators(format) );

    while ( tn.HasMoreTokens() )
    {
        wxString token = tn.GetNextToken();

        // Remove empty token under DOS and Unix, interpret them
        // as .. under Mac.
        if (token.empty())
        {
            if (format == wxPATH_MAC)
                m_dirs.Add( wxT("..") );
            // else ignore
        }
        else
        {
           m_dirs.Add( token );
        }
    }
}

void wxFileName::Assign(const wxString& fullpath,
                        wxPathFormat format)
{
    wxString volume, path, name, ext;
    bool hasExt;
    SplitPath(fullpath, &volume, &path, &name, &ext, &hasExt, format);

    Assign(volume, path, name, ext, hasExt, format);
}

void wxFileName::Assign(const wxString& fullpathOrig,
                        const wxString& fullname,
                        wxPathFormat format)
{
    // always recognize fullpath as directory, even if it doesn't end with a
    // slash
    wxString fullpath = fullpathOrig;
    if ( !fullpath.empty() && !wxEndsWithPathSeparator(fullpath) )
    {
        fullpath += GetPathSeparator(format);
    }

    wxString volume, path, name, ext;
    bool hasExt;

    // do some consistency checks: the name should be really just the filename
    // and the path should be really just a path
    wxString volDummy, pathDummy, nameDummy, extDummy;

    SplitPath(fullname, &volDummy, &pathDummy, &name, &ext, &hasExt, format);

    wxASSERT_MSG( volDummy.empty() && pathDummy.empty(),
                  wxT("the file name shouldn't contain the path") );

    SplitPath(fullpath, &volume, &path, &nameDummy, &extDummy, format);

#ifndef __VMS
   // This test makes no sense on an OpenVMS system.
   wxASSERT_MSG( nameDummy.empty() && extDummy.empty(),
                  wxT("the path shouldn't contain file name nor extension") );
#endif
    Assign(volume, path, name, ext, hasExt, format);
}

void wxFileName::Assign(const wxString& pathOrig,
                        const wxString& name,
                        const wxString& ext,
                        wxPathFormat format)
{
    wxString volume,
             path;
    SplitVolume(pathOrig, &volume, &path, format);

    Assign(volume, path, name, ext, format);
}

void wxFileName::AssignDir(const wxString& dir, wxPathFormat format)
{
    Assign(dir, wxEmptyString, format);
}

void wxFileName::Clear()
{
    m_dirs.clear();
    m_volume.clear();
    m_name.clear();
    m_ext.clear();

    // we don't have any absolute path for now
    m_relative = true;

    // nor any extension
    m_hasExt = false;

    // follow symlinks by default
    m_dontFollowLinks = false;
}

/* static */
wxFileName wxFileName::FileName(const wxString& file, wxPathFormat format)
{
    return wxFileName(file, format);
}

/* static */
wxFileName wxFileName::DirName(const wxString& dir, wxPathFormat format)
{
    wxFileName fn;
    fn.AssignDir(dir, format);
    return fn;
}

// ----------------------------------------------------------------------------
// existence tests
// ----------------------------------------------------------------------------

namespace
{

#if defined(__WINDOWS__) && !defined(__WXMICROWIN__)

void RemoveTrailingSeparatorsFromPath(wxString& strPath)
{
    // Windows fails to find directory named "c:\dir\" even if "c:\dir" exists,
    // so remove all trailing backslashes from the path - but don't do this for
    // the paths "d:\" (which are different from "d:"), for just "\" or for
    // windows unique volume names ("\\?\Volume{GUID}\")
    while ( wxEndsWithPathSeparator( strPath ) )
    {
        size_t len = strPath.length();
        if ( len == 1 || (len == 3 && strPath[len - 2] == wxT(':')) ||
                (len == wxMSWUniqueVolumePrefixLength &&
                 wxFileName::IsMSWUniqueVolumeNamePath(strPath)))
        {
            break;
        }

        strPath.Truncate(len - 1);
    }
}

#endif // __WINDOWS__ || __OS2__

bool
wxFileSystemObjectExists(const wxString& path, int flags)
{

    // Should the existence of file/directory with this name be accepted, i.e.
    // result in the true return value from this function?
    const bool acceptFile = (flags & wxFILE_EXISTS_REGULAR) != 0;
    const bool acceptDir  = (flags & wxFILE_EXISTS_DIR)  != 0;

    wxString strPath(path);

#if defined(__WINDOWS__) && !defined(__WXMICROWIN__)
    if ( acceptDir )
    {
        // Ensure that the path doesn't have any trailing separators when
        // checking for directories.
        RemoveTrailingSeparatorsFromPath(strPath);
    }

    // we must use GetFileAttributes() instead of the ANSI C functions because
    // it can cope with network (UNC) paths unlike them
    DWORD ret = ::GetFileAttributes(strPath.t_str());

    if ( ret == INVALID_FILE_ATTRIBUTES )
        return false;

    if ( ret & FILE_ATTRIBUTE_DIRECTORY )
        return acceptDir;

    // Anything else must be a file (perhaps we should check for
    // FILE_ATTRIBUTE_REPARSE_POINT?)
    return acceptFile;
#elif defined(__OS2__)
    if ( acceptDir )
    {
        // OS/2 can't handle "d:", it wants either "d:\" or "d:."
        if (strPath.length() == 2 && strPath[1u] == wxT(':'))
            strPath << wxT('.');
    }

    FILESTATUS3 Info = {{0}};
    APIRET rc = ::DosQueryPathInfo((PSZ)(WXSTRINGCAST strPath), FIL_STANDARD,
            (void*) &Info, sizeof(FILESTATUS3));

    if ( rc == NO_ERROR )
    {
        if ( Info.attrFile & FILE_DIRECTORY )
            return acceptDir;
        else
            return acceptFile;
    }

    // We consider that the path must exist if we get a sharing violation for
    // it but we don't know what is it in this case.
    if ( rc == ERROR_SHARING_VIOLATION )
        return flags & wxFILE_EXISTS_ANY;

    // Any other error (usually ERROR_PATH_NOT_FOUND), means there is nothing
    // there.
    return false;
#else // Non-MSW, non-OS/2
    wxStructStat st;
    if ( !StatAny(st, strPath, flags) )
        return false;

    if ( S_ISREG(st.st_mode) )
        return acceptFile;
    if ( S_ISDIR(st.st_mode) )
        return acceptDir;
    if ( S_ISLNK(st.st_mode) )
    {
        // Take care to not test for "!= 0" here as this would erroneously
        // return true if only wxFILE_EXISTS_NO_FOLLOW, which is part of
        // wxFILE_EXISTS_SYMLINK, is set too.
        return (flags & wxFILE_EXISTS_SYMLINK) == wxFILE_EXISTS_SYMLINK;
    }
    if ( S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode) )
        return (flags & wxFILE_EXISTS_DEVICE) != 0;
    if ( S_ISFIFO(st.st_mode) )
        return (flags & wxFILE_EXISTS_FIFO) != 0;
    if ( S_ISSOCK(st.st_mode) )
        return (flags & wxFILE_EXISTS_SOCKET) != 0;

    return flags & wxFILE_EXISTS_ANY;
#endif // Platforms
}

} // anonymous namespace

bool wxFileName::FileExists() const
{
    int flags = wxFILE_EXISTS_REGULAR;
    if ( !ShouldFollowLink() )
        flags |= wxFILE_EXISTS_NO_FOLLOW;

    return wxFileSystemObjectExists(GetFullPath(), flags);
}

/* static */
bool wxFileName::FileExists( const wxString &filePath )
{
    return wxFileSystemObjectExists(filePath, wxFILE_EXISTS_REGULAR);
}

bool wxFileName::DirExists() const
{
    int flags = wxFILE_EXISTS_DIR;
    if ( !ShouldFollowLink() )
        flags |= wxFILE_EXISTS_NO_FOLLOW;

    return Exists(GetPath(), flags);
}

/* static */
bool wxFileName::DirExists( const wxString &dirPath )
{
    return wxFileSystemObjectExists(dirPath, wxFILE_EXISTS_DIR);
}

bool wxFileName::Exists(int flags) const
{
    // Notice that wxFILE_EXISTS_NO_FOLLOW may be specified in the flags even
    // if our DontFollowLink() hadn't been called and we do honour it then. But
    // if the user took the care of calling DontFollowLink(), it is always
    // taken into account.
    if ( !ShouldFollowLink() )
        flags |= wxFILE_EXISTS_NO_FOLLOW;

    return wxFileSystemObjectExists(GetFullPath(), flags);
}

/* static */
bool wxFileName::Exists(const wxString& path, int flags)
{
    return wxFileSystemObjectExists(path, flags);
}

// ----------------------------------------------------------------------------
// CWD and HOME stuff
// ----------------------------------------------------------------------------

void wxFileName::AssignCwd(const wxString& volume)
{
    AssignDir(wxFileName::GetCwd(volume));
}

/* static */
wxString wxFileName::GetCwd(const wxString& volume)
{
    // if we have the volume, we must get the current directory on this drive
    // and to do this we have to chdir to this volume - at least under Windows,
    // I don't know how to get the current drive on another volume elsewhere
    // (TODO)
    wxString cwdOld;
    if ( !volume.empty() )
    {
        cwdOld = wxGetCwd();
        SetCwd(volume + GetVolumeSeparator());
    }

    wxString cwd = ::wxGetCwd();

    if ( !volume.empty() )
    {
        SetCwd(cwdOld);
    }

    return cwd;
}

bool wxFileName::SetCwd() const
{
    return wxFileName::SetCwd( GetPath() );
}

bool wxFileName::SetCwd( const wxString &cwd )
{
    return ::wxSetWorkingDirectory( cwd );
}

void wxFileName::AssignHomeDir()
{
    AssignDir(wxFileName::GetHomeDir());
}

wxString wxFileName::GetHomeDir()
{
    return ::wxGetHomeDir();
}


// ----------------------------------------------------------------------------
// CreateTempFileName
// ----------------------------------------------------------------------------

#if wxUSE_FILE || wxUSE_FFILE


#if !defined wx_fdopen && defined HAVE_FDOPEN
    #define wx_fdopen fdopen
#endif

// NB: GetTempFileName() under Windows creates the file, so using
//     O_EXCL there would fail
#ifdef __WINDOWS__
    #define wxOPEN_EXCL 0
#else
    #define wxOPEN_EXCL O_EXCL
#endif


#ifdef wxOpenOSFHandle
#define WX_HAVE_DELETE_ON_CLOSE
// On Windows create a file with the FILE_FLAGS_DELETE_ON_CLOSE flags.
//
static int wxOpenWithDeleteOnClose(const wxString& filename)
{
    DWORD access = GENERIC_READ | GENERIC_WRITE;

    DWORD disposition = OPEN_ALWAYS;

    DWORD attributes = FILE_ATTRIBUTE_TEMPORARY |
                       FILE_FLAG_DELETE_ON_CLOSE;

    HANDLE h = ::CreateFile(filename.t_str(), access, 0, NULL,
                            disposition, attributes, NULL);

    return wxOpenOSFHandle(h, wxO_BINARY);
}
#endif // wxOpenOSFHandle


// Helper to open the file
//
static int wxTempOpen(const wxString& path, bool *deleteOnClose)
{
#ifdef WX_HAVE_DELETE_ON_CLOSE
    if (*deleteOnClose)
        return wxOpenWithDeleteOnClose(path);
#endif

    *deleteOnClose = false;

    return wxOpen(path, wxO_BINARY | O_RDWR | O_CREAT | wxOPEN_EXCL, 0600);
}


#if wxUSE_FFILE
// Helper to open the file and attach it to the wxFFile
//
static bool wxTempOpen(wxFFile *file, const wxString& path, bool *deleteOnClose)
{
#ifndef wx_fdopen
    *deleteOnClose = false;
    return file->Open(path, wxT("w+b"));
#else // wx_fdopen
    int fd = wxTempOpen(path, deleteOnClose);
    if (fd == -1)
        return false;
    file->Attach(wx_fdopen(fd, "w+b"), path);
    return file->IsOpened();
#endif // wx_fdopen
}
#endif // wxUSE_FFILE


#if !wxUSE_FILE
    #define WXFILEARGS(x, y) y
#elif !wxUSE_FFILE
    #define WXFILEARGS(x, y) x
#else
    #define WXFILEARGS(x, y) x, y
#endif


// Implementation of wxFileName::CreateTempFileName().
//
static wxString wxCreateTempImpl(
        const wxString& prefix,
        WXFILEARGS(wxFile *fileTemp, wxFFile *ffileTemp),
        bool *deleteOnClose = NULL)
{
#if wxUSE_FILE && wxUSE_FFILE
    wxASSERT(fileTemp == NULL || ffileTemp == NULL);
#endif
    wxString path, dir, name;
    bool wantDeleteOnClose = false;

    if (deleteOnClose)
    {
        // set the result to false initially
        wantDeleteOnClose = *deleteOnClose;
        *deleteOnClose = false;
    }
    else
    {
        // easier if it alwasys points to something
        deleteOnClose = &wantDeleteOnClose;
    }

    // use the directory specified by the prefix
    wxFileName::SplitPath(prefix, &dir, &name, NULL /* extension */);

    if (dir.empty())
    {
        dir = wxFileName::GetTempDir();
    }

#if defined(__WXWINCE__)
    path = dir + wxT("\\") + name;
    int i = 1;
    while (wxFileName::FileExists(path))
    {
        path = dir + wxT("\\") + name ;
        path << i;
        i ++;
    }

#elif defined(__WINDOWS__) && !defined(__WXMICROWIN__)
    if (!::GetTempFileName(dir.t_str(), name.t_str(), 0,
                           wxStringBuffer(path, MAX_PATH + 1)))
    {
        wxLogLastError(wxT("GetTempFileName"));

        path.clear();
    }

#else // !Windows
    path = dir;

    if ( !wxEndsWithPathSeparator(dir) &&
            (name.empty() || !wxIsPathSeparator(name[0u])) )
    {
        path += wxFILE_SEP_PATH;
    }

    path += name;

#if defined(HAVE_MKSTEMP)
    // scratch space for mkstemp()
    path += wxT("XXXXXX");

    // we need to copy the path to the buffer in which mkstemp() can modify it
    wxCharBuffer buf(path.fn_str());

    // cast is safe because the string length doesn't change
    int fdTemp = mkstemp( (char*)(const char*) buf );
    if ( fdTemp == -1 )
    {
        // this might be not necessary as mkstemp() on most systems should have
        // already done it but it doesn't hurt neither...
        path.clear();
    }
    else // mkstemp() succeeded
    {
        path = wxConvFile.cMB2WX( (const char*) buf );

    #if wxUSE_FILE
        // avoid leaking the fd
        if ( fileTemp )
        {
            fileTemp->Attach(fdTemp);
        }
        else
    #endif

    #if wxUSE_FFILE
        if ( ffileTemp )
        {
        #ifdef wx_fdopen
            ffileTemp->Attach(wx_fdopen(fdTemp, "r+b"), path);
        #else
            ffileTemp->Open(path, wxT("r+b"));
            close(fdTemp);
        #endif
        }
        else
    #endif

        {
            close(fdTemp);
        }
    }
#else // !HAVE_MKSTEMP

#ifdef HAVE_MKTEMP
    // same as above
    path += wxT("XXXXXX");

    wxCharBuffer buf = wxConvFile.cWX2MB( path );
    if ( !mktemp( (char*)(const char*) buf ) )
    {
        path.clear();
    }
    else
    {
        path = wxConvFile.cMB2WX( (const char*) buf );
    }
#else // !HAVE_MKTEMP (includes __DOS__)
    // generate the unique file name ourselves
    #if !defined(__DOS__)
    path << (unsigned int)getpid();
    #endif

    wxString pathTry;

    static const size_t numTries = 1000;
    for ( size_t n = 0; n < numTries; n++ )
    {
        // 3 hex digits is enough for numTries == 1000 < 4096
        pathTry = path + wxString::Format(wxT("%.03x"), (unsigned int) n);
        if ( !wxFileName::FileExists(pathTry) )
        {
            break;
        }

        pathTry.clear();
    }

    path = pathTry;
#endif // HAVE_MKTEMP/!HAVE_MKTEMP

#endif // HAVE_MKSTEMP/!HAVE_MKSTEMP

#endif // Windows/!Windows

    if ( path.empty() )
    {
        wxLogSysError(_("Failed to create a temporary file name"));
    }
    else
    {
        bool ok = true;

        // open the file - of course, there is a race condition here, this is
        // why we always prefer using mkstemp()...
    #if wxUSE_FILE
        if ( fileTemp && !fileTemp->IsOpened() )
        {
            *deleteOnClose = wantDeleteOnClose;
            int fd = wxTempOpen(path, deleteOnClose);
            if (fd != -1)
                fileTemp->Attach(fd);
            else
                ok = false;
        }
    #endif

    #if wxUSE_FFILE
        if ( ffileTemp && !ffileTemp->IsOpened() )
        {
            *deleteOnClose = wantDeleteOnClose;
            ok = wxTempOpen(ffileTemp, path, deleteOnClose);
        }
    #endif

        if ( !ok )
        {
            // FIXME: If !ok here should we loop and try again with another
            //        file name?  That is the standard recourse if open(O_EXCL)
            //        fails, though of course it should be protected against
            //        possible infinite looping too.

            wxLogError(_("Failed to open temporary file."));

            path.clear();
        }
    }

    return path;
}


static bool wxCreateTempImpl(
        const wxString& prefix,
        WXFILEARGS(wxFile *fileTemp, wxFFile *ffileTemp),
        wxString *name)
{
    bool deleteOnClose = true;

    *name = wxCreateTempImpl(prefix,
                             WXFILEARGS(fileTemp, ffileTemp),
                             &deleteOnClose);

    bool ok = !name->empty();

    if (deleteOnClose)
        name->clear();
#ifdef __UNIX__
    else if (ok && wxRemoveFile(*name))
        name->clear();
#endif

    return ok;
}


static void wxAssignTempImpl(
        wxFileName *fn,
        const wxString& prefix,
        WXFILEARGS(wxFile *fileTemp, wxFFile *ffileTemp))
{
    wxString tempname;
    tempname = wxCreateTempImpl(prefix, WXFILEARGS(fileTemp, ffileTemp));

    if ( tempname.empty() )
    {
        // error, failed to get temp file name
        fn->Clear();
    }
    else // ok
    {
        fn->Assign(tempname);
    }
}


void wxFileName::AssignTempFileName(const wxString& prefix)
{
    wxAssignTempImpl(this, prefix, WXFILEARGS(NULL, NULL));
}

/* static */
wxString wxFileName::CreateTempFileName(const wxString& prefix)
{
    return wxCreateTempImpl(prefix, WXFILEARGS(NULL, NULL));
}

#endif // wxUSE_FILE || wxUSE_FFILE


#if wxUSE_FILE

wxString wxCreateTempFileName(const wxString& prefix,
                              wxFile *fileTemp,
                              bool *deleteOnClose)
{
    return wxCreateTempImpl(prefix, WXFILEARGS(fileTemp, NULL), deleteOnClose);
}

bool wxCreateTempFile(const wxString& prefix,
                      wxFile *fileTemp,
                      wxString *name)
{
    return wxCreateTempImpl(prefix, WXFILEARGS(fileTemp, NULL), name);
}

void wxFileName::AssignTempFileName(const wxString& prefix, wxFile *fileTemp)
{
    wxAssignTempImpl(this, prefix, WXFILEARGS(fileTemp, NULL));
}

/* static */
wxString
wxFileName::CreateTempFileName(const wxString& prefix, wxFile *fileTemp)
{
    return wxCreateTempFileName(prefix, fileTemp);
}

#endif // wxUSE_FILE


#if wxUSE_FFILE

wxString wxCreateTempFileName(const wxString& prefix,
                              wxFFile *fileTemp,
                              bool *deleteOnClose)
{
    return wxCreateTempImpl(prefix, WXFILEARGS(NULL, fileTemp), deleteOnClose);
}

bool wxCreateTempFile(const wxString& prefix,
                      wxFFile *fileTemp,
                      wxString *name)
{
    return wxCreateTempImpl(prefix, WXFILEARGS(NULL, fileTemp), name);

}

void wxFileName::AssignTempFileName(const wxString& prefix, wxFFile *fileTemp)
{
    wxAssignTempImpl(this, prefix, WXFILEARGS(NULL, fileTemp));
}

/* static */
wxString
wxFileName::CreateTempFileName(const wxString& prefix, wxFFile *fileTemp)
{
    return wxCreateTempFileName(prefix, fileTemp);
}

#endif // wxUSE_FFILE


// ----------------------------------------------------------------------------
// directory operations
// ----------------------------------------------------------------------------

// helper of GetTempDir(): check if the given directory exists and return it if
// it does or an empty string otherwise
namespace
{

wxString CheckIfDirExists(const wxString& dir)
{
    return wxFileName::DirExists(dir) ? dir : wxString();
}

} // anonymous namespace

wxString wxFileName::GetTempDir()
{
    // first try getting it from environment: this allows overriding the values
    // used by default if the user wants to create temporary files in another
    // directory
    wxString dir = CheckIfDirExists(wxGetenv("TMPDIR"));
    if ( dir.empty() )
    {
        dir = CheckIfDirExists(wxGetenv("TMP"));
        if ( dir.empty() )
            dir = CheckIfDirExists(wxGetenv("TEMP"));
    }

    // if no environment variables are set, use the system default
    if ( dir.empty() )
    {
#if defined(__WXWINCE__)
        dir = CheckIfDirExists(wxT("\\temp"));
#elif defined(__WINDOWS__) && !defined(__WXMICROWIN__)
        if ( !::GetTempPath(MAX_PATH, wxStringBuffer(dir, MAX_PATH + 1)) )
        {
            wxLogLastError(wxT("GetTempPath"));
        }
#elif defined(__WXMAC__) && wxOSX_USE_CARBON
        dir = wxMacFindFolderNoSeparator(short(kOnSystemDisk), kTemporaryFolderType, kCreateFolder);
#endif // systems with native way
    }
    else // we got directory from an environment variable
    {
        // remove any trailing path separators, we don't want to ever return
        // them from this function for consistency
        const size_t lastNonSep = dir.find_last_not_of(GetPathSeparators());
        if ( lastNonSep == wxString::npos )
        {
            // the string consists entirely of separators, leave only one
            dir = GetPathSeparator();
        }
        else
        {
            dir.erase(lastNonSep + 1);
        }
    }

    // fall back to hard coded value
    if ( dir.empty() )
    {
#ifdef __UNIX_LIKE__
        dir = CheckIfDirExists("/tmp");
        if ( dir.empty() )
#endif // __UNIX_LIKE__
            dir = ".";
    }

    return dir;
}

bool wxFileName::Mkdir( int perm, int flags ) const
{
    return wxFileName::Mkdir(GetPath(), perm, flags);
}

bool wxFileName::Mkdir( const wxString& dir, int perm, int flags )
{
    if ( flags & wxPATH_MKDIR_FULL )
    {
        // split the path in components
        wxFileName filename;
        filename.AssignDir(dir);

        wxString currPath;
        if ( filename.HasVolume())
        {
            currPath << wxGetVolumeString(filename.GetVolume(), wxPATH_NATIVE);
        }

        wxArrayString dirs = filename.GetDirs();
        size_t count = dirs.GetCount();
        for ( size_t i = 0; i < count; i++ )
        {
            if ( i > 0 || filename.IsAbsolute() )
                currPath += wxFILE_SEP_PATH;
            currPath += dirs[i];

            if (!DirExists(currPath))
            {
                if (!wxMkdir(currPath, perm))
                {
                    // no need to try creating further directories
                    return false;
                }
            }
        }

        return true;

    }

    return ::wxMkdir( dir, perm );
}

bool wxFileName::Rmdir(int flags) const
{
    return wxFileName::Rmdir( GetPath(), flags );
}

bool wxFileName::Rmdir(const wxString& dir, int flags)
{
#ifdef __WINDOWS__
    if ( flags & wxPATH_RMDIR_RECURSIVE )
    {
        // SHFileOperation needs double null termination string
        // but without separator at the end of the path
        wxString path(dir);
        if ( path.Last() == wxFILE_SEP_PATH )
            path.RemoveLast();
        path += wxT('\0');

        SHFILEOPSTRUCT fileop;
        wxZeroMemory(fileop);
        fileop.wFunc = FO_DELETE;
        fileop.pFrom = path.t_str();
        fileop.fFlags = FOF_SILENT | FOF_NOCONFIRMATION;
    #ifndef __WXWINCE__
        // FOF_NOERRORUI is not defined in WinCE
        fileop.fFlags |= FOF_NOERRORUI;
    #endif

        int ret = SHFileOperation(&fileop);
        if ( ret != 0 )
        {
            // SHFileOperation may return non-Win32 error codes, so the error
            // message can be incorrect
            wxLogApiError(wxT("SHFileOperation"), ret);
            return false;
        }

        return true;
    }
    else if ( flags & wxPATH_RMDIR_FULL )
#else // !__WINDOWS__
    if ( flags != 0 )   // wxPATH_RMDIR_FULL or wxPATH_RMDIR_RECURSIVE
#endif // !__WINDOWS__
    {
#ifndef __WINDOWS__
        if ( flags & wxPATH_RMDIR_RECURSIVE )
        {
            // When deleting the tree recursively, we are supposed to delete
            // this directory itself even when it is a symlink -- but without
            // following it. Do it here as wxRmdir() would simply follow if
            // called for a symlink.
            if ( wxFileName::Exists(dir, wxFILE_EXISTS_SYMLINK) )
            {
                return wxRemoveFile(dir);
            }
        }
#endif // !__WINDOWS__

        wxString path(dir);
        if ( path.Last() != wxFILE_SEP_PATH )
            path += wxFILE_SEP_PATH;

        wxDir d(path);

        if ( !d.IsOpened() )
            return false;

        wxString filename;

        // First delete all subdirectories: notice that we don't follow
        // symbolic links, potentially leading outside this directory, to avoid
        // unpleasant surprises.
        bool cont = d.GetFirst(&filename, wxString(),
                               wxDIR_DIRS | wxDIR_HIDDEN | wxDIR_NO_FOLLOW);
        while ( cont )
        {
            wxFileName::Rmdir(path + filename, flags);
            cont = d.GetNext(&filename);
        }

#ifndef __WINDOWS__
        if ( flags & wxPATH_RMDIR_RECURSIVE )
        {
            // Delete all files too and, for the same reasons as above, don't
            // follow symlinks which could refer to the files outside of this
            // directory and just delete the symlinks themselves.
            cont = d.GetFirst(&filename, wxString(),
                              wxDIR_FILES | wxDIR_HIDDEN | wxDIR_NO_FOLLOW);
            while ( cont )
            {
                ::wxRemoveFile(path + filename);
                cont = d.GetNext(&filename);
            }
        }
#endif // !__WINDOWS__
    }

    return ::wxRmdir(dir);
}

// ----------------------------------------------------------------------------
// path normalization
// ----------------------------------------------------------------------------

bool wxFileName::Normalize(int flags,
                           const wxString& cwd,
                           wxPathFormat format)
{
    // deal with env vars renaming first as this may seriously change the path
    if ( flags & wxPATH_NORM_ENV_VARS )
    {
        wxString pathOrig = GetFullPath(format);
        wxString path = wxExpandEnvVars(pathOrig);
        if ( path != pathOrig )
        {
            Assign(path);
        }
    }

    // the existing path components
    wxArrayString dirs = GetDirs();

    // the path to prepend in front to make the path absolute
    wxFileName curDir;

    format = GetFormat(format);

    // set up the directory to use for making the path absolute later
    if ( (flags & wxPATH_NORM_ABSOLUTE) && !IsAbsolute(format) )
    {
        if ( cwd.empty() )
        {
            curDir.AssignCwd(GetVolume());
        }
        else // cwd provided
        {
            curDir.AssignDir(cwd);
        }
    }

    // handle ~ stuff under Unix only
    if ( (format == wxPATH_UNIX) && (flags & wxPATH_NORM_TILDE) && m_relative )
    {
        if ( !dirs.IsEmpty() )
        {
            wxString dir = dirs[0u];
            if ( !dir.empty() && dir[0u] == wxT('~') )
            {
                // to make the path absolute use the home directory
                curDir.AssignDir(wxGetUserHome(dir.c_str() + 1));
                dirs.RemoveAt(0u);
            }
        }
    }

    // transform relative path into abs one
    if ( curDir.IsOk() )
    {
        // this path may be relative because it doesn't have the volume name
        // and still have m_relative=true; in this case we shouldn't modify
        // our directory components but just set the current volume
        if ( !HasVolume() && curDir.HasVolume() )
        {
            SetVolume(curDir.GetVolume());

            if ( !m_relative )
        {
                // yes, it was the case - we don't need curDir then
                curDir.Clear();
            }
        }

        // finally, prepend curDir to the dirs array
        wxArrayString dirsNew = curDir.GetDirs();
        WX_PREPEND_ARRAY(dirs, dirsNew);

        // if we used e.g. tilde expansion previously and wxGetUserHome didn't
        // return for some reason an absolute path, then curDir maybe not be absolute!
        if ( !curDir.m_relative )
        {
            // we have prepended an absolute path and thus we are now an absolute
            // file name too
            m_relative = false;
        }
        // else if (flags & wxPATH_NORM_ABSOLUTE):
        //   should we warn the user that we didn't manage to make the path absolute?
    }

    // now deal with ".", ".." and the rest
    m_dirs.Empty();
    size_t count = dirs.GetCount();
    for ( size_t n = 0; n < count; n++ )
    {
        wxString dir = dirs[n];

        if ( flags & wxPATH_NORM_DOTS )
        {
            if ( dir == wxT(".") )
            {
                // just ignore
                continue;
            }

            if ( dir == wxT("..") )
            {
                if ( m_dirs.empty() )
                {
                    // We have more ".." than directory components so far.
                    // Don't treat this as an error as the path could have been
                    // entered by user so try to handle it reasonably: if the
                    // path is absolute, just ignore the extra ".." because
                    // "/.." is the same as "/". Otherwise, i.e. for relative
                    // paths, keep ".." unchanged because removing it would
                    // modify the file a relative path refers to.
                    if ( !m_relative )
                        continue;

                }
                else // Normal case, go one step up.
                {
                    m_dirs.pop_back();
                    continue;
                }
            }
        }

        m_dirs.Add(dir);
    }

#if defined(__WIN32__) && !defined(__WXWINCE__) && wxUSE_OLE
    if ( (flags & wxPATH_NORM_SHORTCUT) )
    {
        wxString filename;
        if (GetShortcutTarget(GetFullPath(format), filename))
        {
            m_relative = false;
            Assign(filename);
        }
    }
#endif

#if defined(__WIN32__)
    if ( (flags & wxPATH_NORM_LONG) && (format == wxPATH_DOS) )
    {
        Assign(GetLongPath());
    }
#endif // Win32

    // Change case  (this should be kept at the end of the function, to ensure
    // that the path doesn't change any more after we normalize its case)
    if ( (flags & wxPATH_NORM_CASE) && !IsCaseSensitive(format) )
    {
        m_volume.MakeLower();
        m_name.MakeLower();
        m_ext.MakeLower();

        // directory entries must be made lower case as well
        count = m_dirs.GetCount();
        for ( size_t i = 0; i < count; i++ )
        {
            m_dirs[i].MakeLower();
        }
    }

    return true;
}

#ifndef __WXWINCE__
bool wxFileName::ReplaceEnvVariable(const wxString& envname,
                                    const wxString& replacementFmtString,
                                    wxPathFormat format)
{
    // look into stringForm for the contents of the given environment variable
    wxString val;
    if (envname.empty() ||
        !wxGetEnv(envname, &val))
        return false;
    if (val.empty())
        return false;

    wxString stringForm = GetPath(wxPATH_GET_VOLUME, format);
        // do not touch the file name and the extension

    wxString replacement = wxString::Format(replacementFmtString, envname);
    stringForm.Replace(val, replacement);

    // Now assign ourselves the modified path:
    Assign(stringForm, GetFullName(), format);

    return true;
}
#endif

bool wxFileName::ReplaceHomeDir(wxPathFormat format)
{
    wxString homedir = wxGetHomeDir();
    if (homedir.empty())
        return false;

    wxString stringForm = GetPath(wxPATH_GET_VOLUME, format);
        // do not touch the file name and the extension

    stringForm.Replace(homedir, "~");

    // Now assign ourselves the modified path:
    Assign(stringForm, GetFullName(), format);

    return true;
}

// ----------------------------------------------------------------------------
// get the shortcut target
// ----------------------------------------------------------------------------

// WinCE (3) doesn't have CLSID_ShellLink, IID_IShellLink definitions.
// The .lnk file is a plain text file so it should be easy to
// make it work. Hint from Google Groups:
// "If you open up a lnk file, you'll see a
// number, followed by a pound sign (#), followed by more text. The
// number is the number of characters that follows the pound sign. The
// characters after the pound sign are the command line (which _can_
// include arguments) to be executed. Any path (e.g. \windows\program
// files\myapp.exe) that includes spaces needs to be enclosed in
// quotation marks."

#if defined(__WIN32__) && !defined(__WXWINCE__) && wxUSE_OLE

bool wxFileName::GetShortcutTarget(const wxString& shortcutPath,
                                   wxString& targetFilename,
                                   wxString* arguments) const
{
    wxString path, file, ext;
    wxFileName::SplitPath(shortcutPath, & path, & file, & ext);

    HRESULT hres;
    IShellLink* psl;
    bool success = false;

    // Assume it's not a shortcut if it doesn't end with lnk
    if (ext.CmpNoCase(wxT("lnk"))!=0)
        return false;

    // create a ShellLink object
    hres = CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER,
                            IID_IShellLink, (LPVOID*) &psl);

    if (SUCCEEDED(hres))
    {
        IPersistFile* ppf;
        hres = psl->QueryInterface( IID_IPersistFile, (LPVOID *) &ppf);
        if (SUCCEEDED(hres))
        {
            WCHAR wsz[MAX_PATH];

   …

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