Derive wxBitmap from wxBitmapBase in wxMotif, with the appropriate

[wxWidgets.git] / include / wx / stream.h

diff --git a/include/wx/stream.h b/include/wx/stream.h
index 4bfdf72aa500ff6f6746c0a99f2ceee85c2b276b..c65ac904a9e410d761609b367a0f63f1b195c7ed 100644 (file)
--- a/include/wx/stream.h
+++ b/include/wx/stream.h
@@ -1,7 +1,7 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        stream.h
-// Purpose:     "wxWindows stream" base classes
-// Author:      Guilhem Lavaux
+// Name:        wx/stream.h
+// Purpose:     stream classes
+// Author:      Guilhem Lavaux, Guillermo Rodriguez Garcia, Vadim Zeitlin

 // Modified by:
 // Created:     11/07/98
 // RCS-ID:      $Id$
 // Modified by:
 // Created:     11/07/98
 // RCS-ID:      $Id$


@@ -12,8 +12,8 @@
 #ifndef _WX_WXSTREAM_H__
 #define _WX_WXSTREAM_H__
 
 #ifndef _WX_WXSTREAM_H__
 #define _WX_WXSTREAM_H__
 

-#ifdef __GNUG__
-#pragma interface
+#if defined(__GNUG__) && !defined(__APPLE__)
+#pragma interface "stream.h"

 #endif
 
 #include "wx/defs.h"
 #endif
 
 #include "wx/defs.h"


@@ -34,94 +34,211 @@ typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
 
 WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream);
 
 
 WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream);
 

+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+enum wxStreamError
+{
+    wxSTREAM_NO_ERROR = 0,      // stream is in good state
+    wxSTREAM_EOF,               // EOF reached in Read() or similar
+    wxSTREAM_WRITE_ERROR,       // generic write error
+    wxSTREAM_READ_ERROR         // generic read error
+};
+
+// compatibility
+#if WXWIN_COMPATIBILITY_2_2
+    #define wxStream_NOERROR    wxSTREAM_NOERROR
+    #define wxStream_EOF        wxSTREAM_EOF
+    #define wxStream_WRITE_ERR  wxSTREAM_WRITE_ERROR
+    #define wxStream_READ_ERR   wxSTREAM_READ_ERROR
+
+    #define wxSTREAM_NO_ERR     wxSTREAM_NO_ERROR
+    #define wxSTREAM_NOERROR    wxSTREAM_NO_ERROR
+    #define wxSTREAM_WRITE_ERR  wxSTREAM_WRITE_ERROR
+    #define wxSTREAM_READ_ERR   wxSTREAM_READ_ERROR
+#endif // WXWIN_COMPATIBILITY_2_2
+
+// ============================================================================
+// base stream classes: wxInputStream and wxOutputStream
+// ============================================================================
+

 // ---------------------------------------------------------------------------
 // ---------------------------------------------------------------------------

-// wxStream: base classes
+// wxStreamBase: common (but non virtual!) base for all stream classes

 // ---------------------------------------------------------------------------
 
 // ---------------------------------------------------------------------------
 

-#define wxStream_NOERROR    wxSTREAM_NOERROR
-#define wxStream_EOF        wxSTREAM_EOF
-#define wxStream_WRITE_ERR  wxSTREAM_WRITE_ERROR
-#define wxStream_READ_ERR   wxSTREAM_READ_ERROR
-  
-typedef enum {
-  wxSTREAM_NO_ERROR = 0,
-  wxSTREAM_NO_ERR = wxSTREAM_NO_ERROR,
-  wxSTREAM_NOERROR = wxSTREAM_NO_ERROR,
-  
-  wxSTREAM_EOF,
-  
-  wxSTREAM_WRITE_ERROR,
-  wxSTREAM_WRITE_ERR = wxSTREAM_WRITE_ERROR,
-  
-  wxSTREAM_READ_ERROR,
-  wxSTREAM_READ_ERR = wxSTREAM_READ_ERROR,
-  
-} wxStreamError;
-
-class WXDLLEXPORT wxStreamBase 
+class WXDLLEXPORT wxStreamBase

 {
 public:
     wxStreamBase();
     virtual ~wxStreamBase();
 
 {
 public:
     wxStreamBase();
     virtual ~wxStreamBase();
 

-    bool operator!() const { return (LastError() != wxSTREAM_NOERROR); }
+    // error testing
+    wxStreamError GetLastError() const { return m_lasterror; }
+    bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; }
+    bool operator!() const { return !IsOk(); }
+
+    // reset the stream state
+    void Reset() { m_lasterror = wxSTREAM_NO_ERROR; }
+
+    // deprecated (doesn't make sense!), don't use
+    virtual size_t GetSize() const { return 0; }
+
+#if WXWIN_COMPATIBILITY_2_2
+    // deprecated, for compatibility only

     wxStreamError LastError() const { return m_lasterror; }
     wxStreamError LastError() const { return m_lasterror; }

-    virtual size_t GetSize() const { return ~((size_t)0); }

     size_t StreamSize() const { return GetSize(); }
     size_t StreamSize() const { return GetSize(); }

+#endif // WXWIN_COMPATIBILITY_2_2

 
 protected:
 
 protected:

-    virtual size_t OnSysRead(void *buffer, size_t bufsize);
-    virtual size_t OnSysWrite(const void *buffer, size_t bufsize);

     virtual off_t OnSysSeek(off_t seek, wxSeekMode mode);
     virtual off_t OnSysTell() const;
 
     virtual off_t OnSysSeek(off_t seek, wxSeekMode mode);
     virtual off_t OnSysTell() const;
 

-    friend class wxStreamBuffer;
-

     size_t m_lastcount;
     wxStreamError m_lasterror;
     size_t m_lastcount;
     wxStreamError m_lasterror;

+
+    friend class wxStreamBuffer;
+
+    DECLARE_NO_COPY_CLASS(wxStreamBase)

 };
 
 };
 

-class WXDLLEXPORT wxInputStream: public wxStreamBase 
+// ----------------------------------------------------------------------------
+// wxInputStream: base class for the input streams
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxInputStream : public wxStreamBase

 {
 public:
 {
 public:

+    // ctor and dtor, nothing exciting

     wxInputStream();
     virtual ~wxInputStream();
 
     wxInputStream();
     virtual ~wxInputStream();
 

+

     // IO functions
     // IO functions

+    // ------------
+
+    // return a character from the stream without removing it, i.e. it will
+    // still be returned by the next call to GetC()
+    //
+    // blocks until something appears in the stream if necessary, if nothing
+    // ever does (i.e. EOF) LastRead() will return 0 (and the return value is
+    // undefined), otherwise 1

     virtual char Peek();
     virtual char Peek();

+
+    // return one character from the stream, blocking until it appears if
+    // necessary
+    //
+    // if EOF, return value is undefined and LastRead() will return 0 and not 1

     char GetC();
     char GetC();

+
+    // read at most the given number of bytes from the stream
+    //
+    // there are 2 possible situations here: either there is nothing at all in
+    // the stream right now in which case Read() blocks until something appears
+    // (use CanRead() to avoid this) or there is already some data available in
+    // the stream and then Read() doesn't block but returns just the data it
+    // can read without waiting for more
+    //
+    // in any case, if there are not enough bytes in the stream right now,
+    // LastRead() value will be less than size but greater than 0. If it is 0,
+    // it means that EOF has been reached.

     virtual wxInputStream& Read(void *buffer, size_t size);
     virtual wxInputStream& Read(void *buffer, size_t size);

-    wxInputStream& Read(wxOutputStream& stream_out);

 
 

-    // Position functions
-    virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
-    virtual off_t TellI() const;
+    // copy the entire contents of this stream into streamOut, stopping only
+    // when EOF is reached or an error occurs
+    wxInputStream& Read(wxOutputStream& streamOut);

 
 

-    // State functions
-    virtual size_t LastRead() { return wxStreamBase::m_lastcount; }

 
 

-    // Ungetch
+    // status functions
+    // ----------------
+
+    // returns the number of bytes read by the last call to Read(), GetC() or
+    // Peek()
+    //
+    // this should be used to discover whether that call succeeded in reading
+    // all the requested data or not
+    virtual size_t LastRead() const { return wxStreamBase::m_lastcount; }
+
+    // returns TRUE if some data is available in the stream right now, so that
+    // calling Read() wouldn't block
+    virtual bool CanRead() const;
+
+    // is the stream at EOF?
+    //
+    // note that this cannot be really implemented for all streams and
+    // CanRead() is more reliable than Eof()
+    virtual bool Eof() const;
+
+
+    // write back buffer
+    // -----------------
+
+    // put back the specified number of bytes into the stream, they will be
+    // fetched by the next call to the read functions
+    //
+    // returns the number of bytes really stuffed back

     size_t Ungetch(const void *buffer, size_t size);
     size_t Ungetch(const void *buffer, size_t size);

+
+    // put back the specified character in the stream
+    //
+    // returns TRUE if ok, FALSE on error

     bool Ungetch(char c);
 
     bool Ungetch(char c);
 

-    // Operators
+
+    // position functions
+    // ------------------
+
+    // move the stream pointer to the given position (if the stream supports
+    // it)
+    //
+    // returns wxInvalidOffset on error
+    virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
+
+    // return the current position of the stream pointer or wxInvalidOffset
+    virtual off_t TellI() const;
+
+
+    // stream-like operators
+    // ---------------------
+

     wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
     wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }

-#if wxUSE_SERIAL
-    wxInputStream& operator>>(wxObject *& obj);
-#endif
-    wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
+    wxInputStream& operator>>(__wxInputManip func) { return func(*this); }

 
 protected:
 
 protected:

-    // Ungetch managers
+    // do read up to size bytes of data into the provided buffer
+    //
+    // this method should return 0 if EOF has been reached or an error occured
+    // (m_lasterror should be set accordingly as well) or the number of bytes
+    // read
+    virtual size_t OnSysRead(void *buffer, size_t size) = 0;
+
+    // write-back buffer support
+    // -------------------------
+
+    // return the pointer to a buffer big enough to hold sizeNeeded bytes
+    char *AllocSpaceWBack(size_t sizeNeeded);
+
+    // read up to size data from the write back buffer, return the number of
+    // bytes read
+    size_t GetWBack(void *buf, size_t size);
+
+    // write back buffer or NULL if none

     char *m_wback;
     char *m_wback;

+
+    // the size of the buffer

     size_t m_wbacksize;
     size_t m_wbacksize;

+
+    // the current position in the buffer

     size_t m_wbackcur;
 
     size_t m_wbackcur;
 

-    char *AllocSpaceWBack(size_t needed_size);
-    size_t GetWBack(char *buf, size_t bsize);
+    friend class wxStreamBuffer;

 };
 
 };
 

-class WXDLLEXPORT wxOutputStream: public wxStreamBase 
+// ----------------------------------------------------------------------------
+// wxOutputStream: base for the output streams
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxOutputStream : public wxStreamBase

 {
 public:
     wxOutputStream();
 {
 public:
     wxOutputStream();


@@ -139,17 +256,25 @@ public:
     virtual void Sync();
 
     wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
     virtual void Sync();
 
     wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }

-#if wxUSE_SERIAL
-    wxOutputStream& operator<<(wxObject& obj);
-#endif

     wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); }
     wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); }

+
+protected:
+    // to be implemented in the derived classes (it should have been pure
+    // virtual)
+    virtual size_t OnSysWrite(const void *buffer, size_t bufsize);
+
+    friend class wxStreamBuffer;

 };
 
 };
 

+// ============================================================================
+// helper stream classes
+// ============================================================================
+

 // ---------------------------------------------------------------------------
 // A stream for measuring streamed output
 // ---------------------------------------------------------------------------
 
 // ---------------------------------------------------------------------------
 // A stream for measuring streamed output
 // ---------------------------------------------------------------------------
 

-class wxCountingOutputStream: public wxOutputStream 
+class WXDLLEXPORT wxCountingOutputStream : public wxOutputStream

 {
 public:
     wxCountingOutputStream();
 {
 public:
     wxCountingOutputStream();


@@ -158,84 +283,104 @@ public:
     bool Ok() const { return TRUE; }
 
 protected:
     bool Ok() const { return TRUE; }
 
 protected:

-    size_t OnSysWrite(const void *buffer, size_t size);
-    off_t OnSysSeek(off_t pos, wxSeekMode mode);
-    off_t OnSysTell() const;
+    virtual size_t OnSysWrite(const void *buffer, size_t size);
+    virtual off_t OnSysSeek(off_t pos, wxSeekMode mode);
+    virtual off_t OnSysTell() const;

 
     size_t m_currentPos;
 };
 
 
     size_t m_currentPos;
 };
 

-

 // ---------------------------------------------------------------------------
 // "Filter" streams
 // ---------------------------------------------------------------------------
 
 // ---------------------------------------------------------------------------
 // "Filter" streams
 // ---------------------------------------------------------------------------
 

-class WXDLLEXPORT wxFilterInputStream: public wxInputStream 
+class WXDLLEXPORT wxFilterInputStream : public wxInputStream

 {
 public:
     wxFilterInputStream();
     wxFilterInputStream(wxInputStream& stream);
 {
 public:
     wxFilterInputStream();
     wxFilterInputStream(wxInputStream& stream);

-    ~wxFilterInputStream();
+    virtual ~wxFilterInputStream();

 
     char Peek() { return m_parent_i_stream->Peek(); }
 
     size_t GetSize() const { return m_parent_i_stream->GetSize(); }
 
 
     char Peek() { return m_parent_i_stream->Peek(); }
 
     size_t GetSize() const { return m_parent_i_stream->GetSize(); }
 

+    wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; }
+

 protected:
     wxInputStream *m_parent_i_stream;
 protected:
     wxInputStream *m_parent_i_stream;

+
+    DECLARE_NO_COPY_CLASS(wxFilterInputStream)

 };
 
 };
 

-class WXDLLEXPORT wxFilterOutputStream: public wxOutputStream 
+class WXDLLEXPORT wxFilterOutputStream : public wxOutputStream

 {
 public:
     wxFilterOutputStream();
     wxFilterOutputStream(wxOutputStream& stream);
 {
 public:
     wxFilterOutputStream();
     wxFilterOutputStream(wxOutputStream& stream);

-    ~wxFilterOutputStream();
+    virtual ~wxFilterOutputStream();

 
     size_t GetSize() const { return m_parent_o_stream->GetSize(); }
 
 
     size_t GetSize() const { return m_parent_o_stream->GetSize(); }
 

+    wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; }
+

 protected:
     wxOutputStream *m_parent_o_stream;
 protected:
     wxOutputStream *m_parent_o_stream;

+
+    DECLARE_NO_COPY_CLASS(wxFilterOutputStream)

 };
 
 };
 

+// ============================================================================
+// buffered streams
+// ============================================================================
+

 // ---------------------------------------------------------------------------
 // ---------------------------------------------------------------------------

-// Stream buffer
+// Stream buffer: this class can be derived from and passed to
+// wxBufferedStreams to implement custom buffering

 // ---------------------------------------------------------------------------
 
 // ---------------------------------------------------------------------------
 

-class WXDLLEXPORT wxStreamBuffer 
+class WXDLLEXPORT wxStreamBuffer

 {
 public:
 {
 public:

-    typedef enum {
-        read = 0, write, read_write
-    } BufMode;
+    enum BufMode
+    {
+        read,
+        write,
+        read_write
+    };

 
     wxStreamBuffer(wxStreamBase& stream, BufMode mode);
 
     wxStreamBuffer(wxStreamBase& stream, BufMode mode);

-    wxStreamBuffer(BufMode mode);

     wxStreamBuffer(const wxStreamBuffer& buf);
     wxStreamBuffer(const wxStreamBuffer& buf);

-    ~wxStreamBuffer();
+    virtual ~wxStreamBuffer();

 
     // Filtered IO
 
     // Filtered IO

-    size_t Read(void *buffer, size_t size);
+    virtual size_t Read(void *buffer, size_t size);

     size_t Read(wxStreamBuffer *buf);
     size_t Read(wxStreamBuffer *buf);

-    size_t Write(const void *buffer, size_t size);
+    virtual size_t Write(const void *buffer, size_t size);

     size_t Write(wxStreamBuffer *buf);
 
     size_t Write(wxStreamBuffer *buf);
 

-    char Peek();
-    char GetChar();
-    void PutChar(char c);
-    off_t Tell() const;
-    off_t Seek(off_t pos, wxSeekMode mode);
+    virtual char Peek();
+    virtual char GetChar();
+    virtual void PutChar(char c);
+    virtual off_t Tell() const;
+    virtual off_t Seek(off_t pos, wxSeekMode mode);

 
     // Buffer control
     void ResetBuffer();
 
     // Buffer control
     void ResetBuffer();

-    void SetBufferIO(char *buffer_start, char *buffer_end);
+
+    // NB: the buffer must always be allocated with malloc() if takeOwn is
+    //     TRUE as it will be deallocated by free()
+    void SetBufferIO(void *start, void *end, bool takeOwnership = FALSE);
+    void SetBufferIO(void *start, size_t len, bool takeOwnership = FALSE);

     void SetBufferIO(size_t bufsize);
     void SetBufferIO(size_t bufsize);

-    char *GetBufferStart() const { return m_buffer_start; }
-    char *GetBufferEnd() const { return m_buffer_end; }
-    char *GetBufferPos() const { return m_buffer_pos; }
-    off_t GetIntPosition() const { return m_buffer_pos-m_buffer_start; }
-    void SetIntPosition(off_t pos) { m_buffer_pos = m_buffer_start+pos; }
-    size_t GetLastAccess() const { return m_buffer_end-m_buffer_start; }
+    void *GetBufferStart() const { return m_buffer_start; }
+    void *GetBufferEnd() const { return m_buffer_end; }
+    void *GetBufferPos() const { return m_buffer_pos; }
+    size_t GetBufferSize() const { return m_buffer_size; }
+    size_t GetIntPosition() const { return m_buffer_pos - m_buffer_start; }
+    void SetIntPosition(size_t pos) { m_buffer_pos = m_buffer_start + pos; }
+    size_t GetLastAccess() const { return m_buffer_end - m_buffer_start; }
+    size_t GetBytesLeft() const { return m_buffer_end - m_buffer_pos; }

 
     void Fixed(bool fixed) { m_fixed = fixed; }
     void Flushable(bool f) { m_flushable = f; }
 
     void Fixed(bool fixed) { m_fixed = fixed; }
     void Flushable(bool f) { m_flushable = f; }


@@ -244,58 +389,120 @@ public:
     bool FillBuffer();
     size_t GetDataLeft();
 
     bool FillBuffer();
     size_t GetDataLeft();
 

-    // Misc.
+    // misc accessors
+    wxStreamBase *GetStream() const { return m_stream; }
+    bool HasBuffer() const { return m_buffer_size != 0; }
+
+    bool IsFixed() const { return m_fixed; }
+    bool IsFlushable() const { return m_flushable; }
+
+    // only for input/output buffers respectively, returns NULL otherwise
+    wxInputStream *GetInputStream() const;
+    wxOutputStream *GetOutputStream() const;
+
+    // deprecated, for compatibility only

     wxStreamBase *Stream() { return m_stream; }
 
     wxStreamBase *Stream() { return m_stream; }
 

+    // this constructs a dummy wxStreamBuffer, used by (and exists for)
+    // wxMemoryStreams only, don't use!
+    wxStreamBuffer(BufMode mode);
+

 protected:
     void GetFromBuffer(void *buffer, size_t size);
     void PutToBuffer(const void *buffer, size_t size);
 
 protected:
     void GetFromBuffer(void *buffer, size_t size);
     void PutToBuffer(const void *buffer, size_t size);
 

-    char *m_buffer_start, *m_buffer_end, *m_buffer_pos;
-    size_t m_buffer_size;
+    // set the last error to the specified value if we didn't have it before
+    void SetError(wxStreamError err);

 
 

-    bool m_fixed, m_flushable;
+    // common part of several ctors
+    void Init();

 
 

+    // init buffer variables to be empty
+    void InitBuffer();
+
+    // free the buffer (always safe to call)
+    void FreeBuffer();
+
+    // the buffer itself: the pointers to its start and end and the current
+    // position in the buffer
+    char *m_buffer_start,
+         *m_buffer_end,
+         *m_buffer_pos;
+
+    // the buffer size
+    // FIXME: isn't it the same as m_buffer_end - m_buffer_start? (VZ)
+    size_t m_buffer_size;
+
+    // the stream we're associated with

     wxStreamBase *m_stream;
     wxStreamBase *m_stream;

+
+    // its mode

     BufMode m_mode;
     BufMode m_mode;

-    bool m_destroybuf, m_destroystream;
+
+    // flags
+    bool m_destroybuf,      // deallocate buffer?
+         m_fixed,
+         m_flushable;
+
+private:
+// Cannot use
+//  DECLARE_NO_COPY_CLASS(wxStreamBuffer)
+// because copy constructor is explicitly declared above;
+// but no copy assignment operator is defined, so declare
+// it private to prevent the compiler from defining it:
+    wxStreamBuffer& operator=(const wxStreamBuffer&);

 };
 
 // ---------------------------------------------------------------------------
 };
 
 // ---------------------------------------------------------------------------

-// wxBufferedStreams
+// wxBufferedInputStream

 // ---------------------------------------------------------------------------
 
 // ---------------------------------------------------------------------------
 

-class wxBufferedInputStream: public wxFilterInputStream 
+class WXDLLEXPORT wxBufferedInputStream : public wxFilterInputStream

 {
 public:
 {
 public:

-    wxBufferedInputStream(wxInputStream& stream);
-    ~wxBufferedInputStream();
+    // if a non NULL buffer is given to the stream, it will be deleted by it
+    wxBufferedInputStream(wxInputStream& stream,
+                          wxStreamBuffer *buffer = NULL);
+    virtual ~wxBufferedInputStream();

 
     char Peek();
     wxInputStream& Read(void *buffer, size_t size);
 
     char Peek();
     wxInputStream& Read(void *buffer, size_t size);

-  
+

     // Position functions
     off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
     off_t TellI() const;
 
     // Position functions
     off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
     off_t TellI() const;
 

+    // the buffer given to the stream will be deleted by it
+    void SetInputStreamBuffer(wxStreamBuffer *buffer);
+    wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
+
+    // deprecated, for compatibility only

     wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
 
 protected:
     wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
 
 protected:

-    size_t OnSysRead(void *buffer, size_t bufsize);
-    off_t OnSysSeek(off_t seek, wxSeekMode mode);
-    off_t OnSysTell() const;  
+    virtual size_t OnSysRead(void *buffer, size_t bufsize);
+    virtual off_t OnSysSeek(off_t seek, wxSeekMode mode);
+    virtual off_t OnSysTell() const;

 
     wxStreamBuffer *m_i_streambuf;
 
     wxStreamBuffer *m_i_streambuf;

+
+    DECLARE_NO_COPY_CLASS(wxBufferedInputStream)

 };
 
 };
 

-class wxBufferedOutputStream: public wxFilterOutputStream 
+// ----------------------------------------------------------------------------
+// wxBufferedOutputStream
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxBufferedOutputStream : public wxFilterOutputStream

 {
 public:
 {
 public:

-    wxBufferedOutputStream(wxOutputStream& stream);
-    ~wxBufferedOutputStream();
+    // if a non NULL buffer is given to the stream, it will be deleted by it
+    wxBufferedOutputStream(wxOutputStream& stream,
+                           wxStreamBuffer *buffer = NULL);
+    virtual ~wxBufferedOutputStream();

 
     wxOutputStream& Write(const void *buffer, size_t size);
 
     wxOutputStream& Write(const void *buffer, size_t size);

-  
+

     // Position functions
     off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
     off_t TellO() const;
     // Position functions
     off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
     off_t TellO() const;


@@ -303,19 +510,25 @@ public:
     void Sync();
 
     size_t GetSize() const;
     void Sync();
 
     size_t GetSize() const;

-  
+
+    // the buffer given to the stream will be deleted by it
+    void SetOutputStreamBuffer(wxStreamBuffer *buffer);
+    wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
+
+    // deprecated, for compatibility only

     wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; }
 
 protected:
     wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; }
 
 protected:

-    size_t OnSysWrite(const void *buffer, size_t bufsize);
-    off_t OnSysSeek(off_t seek, wxSeekMode mode);
-    off_t OnSysTell() const;  
+    virtual size_t OnSysWrite(const void *buffer, size_t bufsize);
+    virtual off_t OnSysSeek(off_t seek, wxSeekMode mode);
+    virtual off_t OnSysTell() const;

 
     wxStreamBuffer *m_o_streambuf;
 
     wxStreamBuffer *m_o_streambuf;

+
+    DECLARE_NO_COPY_CLASS(wxBufferedOutputStream)

 };
 
 };
 

-#endif
-  // wxUSE_STREAMS
+#endif // wxUSE_STREAMS
+
+#endif // _WX_WXSTREAM_H__

 
 

-#endif
-  // _WX_WXSTREAM_H__