make more Init() functions private

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

diff --git a/include/wx/stream.h b/include/wx/stream.h
index d40eb6673327ded74a597bb2301d0c54c387c00c..80c81bcbdc0a8f32bd6aeb1de583dee4cb36fd29 100644 (file)
--- a/include/wx/stream.h
+++ b/include/wx/stream.h
@@ -12,10 +12,6 @@
 #ifndef _WX_WXSTREAM_H__
 #define _WX_WXSTREAM_H__
 
 #ifndef _WX_WXSTREAM_H__
 #define _WX_WXSTREAM_H__
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma interface "stream.h"
-#endif
-

 #include "wx/defs.h"
 
 #if wxUSE_STREAMS
 #include "wx/defs.h"
 
 #if wxUSE_STREAMS


@@ -25,9 +21,9 @@
 #include "wx/string.h"
 #include "wx/filefn.h"  // for wxFileOffset, wxInvalidOffset and wxSeekMode
 
 #include "wx/string.h"
 #include "wx/filefn.h"  // for wxFileOffset, wxInvalidOffset and wxSeekMode
 

-class WXDLLIMPEXP_BASE wxStreamBase;
-class WXDLLIMPEXP_BASE wxInputStream;
-class WXDLLIMPEXP_BASE wxOutputStream;
+class WXDLLIMPEXP_FWD_BASE wxStreamBase;
+class WXDLLIMPEXP_FWD_BASE wxInputStream;
+class WXDLLIMPEXP_FWD_BASE wxOutputStream;

 
 typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
 typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
 
 typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
 typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);


@@ -46,18 +42,7 @@ enum wxStreamError
     wxSTREAM_READ_ERROR         // generic read 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
+const int wxEOF = -1;

 
 // ============================================================================
 // base stream classes: wxInputStream and wxOutputStream
 
 // ============================================================================
 // base stream classes: wxInputStream and wxOutputStream


@@ -67,7 +52,7 @@ enum wxStreamError
 // wxStreamBase: common (but non virtual!) base for all stream classes
 // ---------------------------------------------------------------------------
 
 // wxStreamBase: common (but non virtual!) base for all stream classes
 // ---------------------------------------------------------------------------
 

-class WXDLLIMPEXP_BASE wxStreamBase
+class WXDLLIMPEXP_BASE wxStreamBase : public wxObject

 {
 public:
     wxStreamBase();
 {
 public:
     wxStreamBase();


@@ -75,11 +60,11 @@ public:
 
     // error testing
     wxStreamError GetLastError() const { return m_lasterror; }
 
     // error testing
     wxStreamError GetLastError() const { return m_lasterror; }

-    bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; }
+    virtual bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; }

     bool operator!() const { return !IsOk(); }
 
     // reset the stream state
     bool operator!() const { return !IsOk(); }
 
     // reset the stream state

-    void Reset() { m_lasterror = wxSTREAM_NO_ERROR; }
+    void Reset(wxStreamError error = wxSTREAM_NO_ERROR) { m_lasterror = error; }

 
     // this doesn't make sense for all streams, always test its return value
     virtual size_t GetSize() const;
 
     // this doesn't make sense for all streams, always test its return value
     virtual size_t GetSize() const;


@@ -88,24 +73,6 @@ public:
     // returns true if the streams supports seeking to arbitrary offsets
     virtual bool IsSeekable() const { return false; }
 
     // returns true if the streams supports seeking to arbitrary offsets
     virtual bool IsSeekable() const { return false; }
 

-#if WXWIN_COMPATIBILITY_2_2
-    // deprecated, for compatibility only
-    wxDEPRECATED( wxStreamError LastError() const );
-    wxDEPRECATED( size_t StreamSize() const );
-#endif // WXWIN_COMPATIBILITY_2_2
-
-
-    // Reserved for future use
-    virtual void ReservedStreamFunc1() {}
-    virtual void ReservedStreamFunc2() {}
-    virtual void ReservedStreamFunc3() {}
-    virtual void ReservedStreamFunc4() {}
-    virtual void ReservedStreamFunc5() {}
-    virtual void ReservedStreamFunc6() {}
-    virtual void ReservedStreamFunc7() {}
-    virtual void ReservedStreamFunc8() {}
-    virtual void ReservedStreamFunc9() {}
-

 protected:
     virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode);
     virtual wxFileOffset OnSysTell() const;
 protected:
     virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode);
     virtual wxFileOffset OnSysTell() const;


@@ -115,7 +82,8 @@ protected:
 
     friend class wxStreamBuffer;
 
 
     friend class wxStreamBuffer;
 

-    DECLARE_NO_COPY_CLASS(wxStreamBase)
+    DECLARE_ABSTRACT_CLASS(wxStreamBase)
+    wxDECLARE_NO_COPY_CLASS(wxStreamBase);

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


@@ -141,11 +109,11 @@ public:
     // undefined), otherwise 1
     virtual char Peek();
 
     // undefined), otherwise 1
     virtual char Peek();
 

-    // return one character from the stream, blocking until it appears if
+    // return one byte from the stream, blocking until it appears if

     // necessary
     //
     // necessary
     //

-    // if EOF, return value is undefined and LastRead() will return 0 and not 1
-    char GetC();
+    // on success returns a value between 0 - 255, or wxEOF on EOF or error.
+    int GetC();

 
     // read at most the given number of bytes from the stream
     //
 
     // read at most the given number of bytes from the stream
     //


@@ -249,7 +217,8 @@ protected:
 
     friend class wxStreamBuffer;
 
 
     friend class wxStreamBuffer;
 

-    DECLARE_NO_COPY_CLASS(wxInputStream)
+    DECLARE_ABSTRACT_CLASS(wxInputStream)
+    wxDECLARE_NO_COPY_CLASS(wxInputStream);

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


@@ -284,7 +253,8 @@ protected:
 
     friend class wxStreamBuffer;
 
 
     friend class wxStreamBuffer;
 

-    DECLARE_NO_COPY_CLASS(wxOutputStream)
+    DECLARE_ABSTRACT_CLASS(wxOutputStream)
+    wxDECLARE_NO_COPY_CLASS(wxOutputStream);

 };
 
 // ============================================================================
 };
 
 // ============================================================================


@@ -301,7 +271,8 @@ public:
     wxCountingOutputStream();
 
     wxFileOffset GetLength() const;
     wxCountingOutputStream();
 
     wxFileOffset GetLength() const;

-    bool Ok() const { return true; }
+    bool Ok() const { return IsOk(); }
+    bool IsOk() const { return true; }

 
 protected:
     virtual size_t OnSysWrite(const void *buffer, size_t size);
 
 protected:
     virtual size_t OnSysWrite(const void *buffer, size_t size);


@@ -310,7 +281,8 @@ protected:
 
     size_t m_currentPos;
 
 
     size_t m_currentPos;
 

-    DECLARE_NO_COPY_CLASS(wxCountingOutputStream)
+    DECLARE_DYNAMIC_CLASS(wxCountingOutputStream)
+    wxDECLARE_NO_COPY_CLASS(wxCountingOutputStream);

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


@@ -322,6 +294,7 @@ class WXDLLIMPEXP_BASE wxFilterInputStream : public wxInputStream
 public:
     wxFilterInputStream();
     wxFilterInputStream(wxInputStream& stream);
 public:
     wxFilterInputStream();
     wxFilterInputStream(wxInputStream& stream);

+    wxFilterInputStream(wxInputStream *stream);

     virtual ~wxFilterInputStream();
 
     char Peek() { return m_parent_i_stream->Peek(); }
     virtual ~wxFilterInputStream();
 
     char Peek() { return m_parent_i_stream->Peek(); }


@@ -332,8 +305,10 @@ public:
 
 protected:
     wxInputStream *m_parent_i_stream;
 
 protected:
     wxInputStream *m_parent_i_stream;

+    bool m_owns;

 
 

-    DECLARE_NO_COPY_CLASS(wxFilterInputStream)
+    DECLARE_ABSTRACT_CLASS(wxFilterInputStream)
+    wxDECLARE_NO_COPY_CLASS(wxFilterInputStream);

 };
 
 class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream
 };
 
 class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream


@@ -341,16 +316,85 @@ class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream
 public:
     wxFilterOutputStream();
     wxFilterOutputStream(wxOutputStream& stream);
 public:
     wxFilterOutputStream();
     wxFilterOutputStream(wxOutputStream& stream);

+    wxFilterOutputStream(wxOutputStream *stream);

     virtual ~wxFilterOutputStream();
 
     wxFileOffset GetLength() const { return m_parent_o_stream->GetLength(); }
 
     wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; }
 
     virtual ~wxFilterOutputStream();
 
     wxFileOffset GetLength() const { return m_parent_o_stream->GetLength(); }
 
     wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; }
 

+    bool Close();
+

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

+    bool m_owns;

 
 

-    DECLARE_NO_COPY_CLASS(wxFilterOutputStream)
+    DECLARE_ABSTRACT_CLASS(wxFilterOutputStream)
+    wxDECLARE_NO_COPY_CLASS(wxFilterOutputStream);
+};
+
+enum wxStreamProtocolType
+{
+    wxSTREAM_PROTOCOL,  // wxFileSystem protocol (should be only one)
+    wxSTREAM_MIMETYPE,  // MIME types the stream handles
+    wxSTREAM_ENCODING,  // The HTTP Content-Encodings the stream handles
+    wxSTREAM_FILEEXT    // File extensions the stream handles
+};
+
+void WXDLLIMPEXP_BASE wxUseFilterClasses();
+
+class WXDLLIMPEXP_BASE wxFilterClassFactoryBase : public wxObject
+{
+public:
+    virtual ~wxFilterClassFactoryBase() { }
+
+    wxString GetProtocol() const { return wxString(*GetProtocols()); }
+    wxString PopExtension(const wxString& location) const;
+
+    virtual const wxChar * const *GetProtocols(wxStreamProtocolType type
+                                               = wxSTREAM_PROTOCOL) const = 0;
+
+    bool CanHandle(const wxString& protocol,
+                   wxStreamProtocolType type
+                   = wxSTREAM_PROTOCOL) const;
+
+protected:
+    wxString::size_type FindExtension(const wxString& location) const;
+
+    DECLARE_ABSTRACT_CLASS(wxFilterClassFactoryBase)
+};
+
+class WXDLLIMPEXP_BASE wxFilterClassFactory : public wxFilterClassFactoryBase
+{
+public:
+    virtual ~wxFilterClassFactory() { }
+
+    virtual wxFilterInputStream  *NewStream(wxInputStream& stream)  const = 0;
+    virtual wxFilterOutputStream *NewStream(wxOutputStream& stream) const = 0;
+    virtual wxFilterInputStream  *NewStream(wxInputStream *stream)  const = 0;
+    virtual wxFilterOutputStream *NewStream(wxOutputStream *stream) const = 0;
+
+    static const wxFilterClassFactory *Find(const wxString& protocol,
+                                            wxStreamProtocolType type
+                                            = wxSTREAM_PROTOCOL);
+
+    static const wxFilterClassFactory *GetFirst();
+    const wxFilterClassFactory *GetNext() const { return m_next; }
+
+    void PushFront() { Remove(); m_next = sm_first; sm_first = this; }
+    void Remove();
+
+protected:
+    wxFilterClassFactory() : m_next(this) { }
+
+    wxFilterClassFactory& operator=(const wxFilterClassFactory&)
+        { return *this; }
+
+private:
+    static wxFilterClassFactory *sm_first;
+    wxFilterClassFactory *m_next;
+
+    DECLARE_ABSTRACT_CLASS(wxFilterClassFactory)

 };
 
 // ============================================================================
 };
 
 // ============================================================================


@@ -372,7 +416,23 @@ public:
         read_write
     };
 
         read_write
     };
 

-    wxStreamBuffer(wxStreamBase& stream, BufMode mode);
+    wxStreamBuffer(wxStreamBase& stream, BufMode mode)
+    {
+        InitWithStream(stream, mode);
+    }
+
+    wxStreamBuffer(size_t bufsize, wxInputStream& stream)
+    {
+        InitWithStream(stream, read);
+        SetBufferIO(bufsize);
+    }
+
+    wxStreamBuffer(size_t bufsize, wxOutputStream& stream)
+    {
+        InitWithStream(stream, write);
+        SetBufferIO(bufsize);
+    }
+

     wxStreamBuffer(const wxStreamBuffer& buf);
     virtual ~wxStreamBuffer();
 
     wxStreamBuffer(const wxStreamBuffer& buf);
     virtual ~wxStreamBuffer();
 


@@ -390,6 +450,7 @@ public:
 
     // Buffer control
     void ResetBuffer();
 
     // Buffer control
     void ResetBuffer();

+    void Truncate();

 
     // NB: the buffer must always be allocated with malloc() if takeOwn is
     //     true as it will be deallocated by free()
 
     // NB: the buffer must always be allocated with malloc() if takeOwn is
     //     true as it will be deallocated by free()


@@ -399,7 +460,7 @@ public:
     void *GetBufferStart() const { return m_buffer_start; }
     void *GetBufferEnd() const { return m_buffer_end; }
     void *GetBufferPos() const { return m_buffer_pos; }
     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 GetBufferSize() const { return m_buffer_end - m_buffer_start; }

     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 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; }


@@ -414,7 +475,7 @@ public:
 
     // misc accessors
     wxStreamBase *GetStream() const { return m_stream; }
 
     // misc accessors
     wxStreamBase *GetStream() const { return m_stream; }

-    bool HasBuffer() const { return m_buffer_size != 0; }
+    bool HasBuffer() const { return m_buffer_start != m_buffer_end; }

 
     bool IsFixed() const { return m_fixed; }
     bool IsFlushable() const { return m_flushable; }
 
     bool IsFixed() const { return m_fixed; }
     bool IsFlushable() const { return m_flushable; }


@@ -423,8 +484,10 @@ public:
     wxInputStream *GetInputStream() const;
     wxOutputStream *GetOutputStream() const;
 
     wxInputStream *GetInputStream() const;
     wxOutputStream *GetOutputStream() const;
 

+#if WXWIN_COMPATIBILITY_2_6

     // deprecated, for compatibility only
     // deprecated, for compatibility only

-    wxStreamBase *Stream() { return m_stream; }
+    wxDEPRECATED( wxStreamBase *Stream() );
+#endif // WXWIN_COMPATIBILITY_2_6

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


@@ -440,6 +503,9 @@ protected:
     // common part of several ctors
     void Init();
 
     // common part of several ctors
     void Init();
 

+    // common part of ctors taking wxStreamBase parameter
+    void InitWithStream(wxStreamBase& stream, BufMode mode);
+

     // init buffer variables to be empty
     void InitBuffer();
 
     // init buffer variables to be empty
     void InitBuffer();
 


@@ -452,10 +518,6 @@ protected:
          *m_buffer_end,
          *m_buffer_pos;
 
          *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;
 
     // the stream we're associated with
     wxStreamBase *m_stream;
 


@@ -467,13 +529,8 @@ protected:
          m_fixed,
          m_flushable;
 
          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&);
+
+    wxDECLARE_NO_ASSIGN_CLASS(wxStreamBuffer);

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


@@ -483,9 +540,19 @@ private:
 class WXDLLIMPEXP_BASE wxBufferedInputStream : public wxFilterInputStream
 {
 public:
 class WXDLLIMPEXP_BASE wxBufferedInputStream : public wxFilterInputStream
 {
 public:

-    // if a non NULL buffer is given to the stream, it will be deleted by it
+    // create a buffered stream on top of the specified low-level stream
+    //
+    // if a non NULL buffer is given to the stream, it will be deleted by it,
+    // otherwise a default 1KB buffer will be used

     wxBufferedInputStream(wxInputStream& stream,
                           wxStreamBuffer *buffer = NULL);
     wxBufferedInputStream(wxInputStream& stream,
                           wxStreamBuffer *buffer = NULL);

+
+    // ctor allowing to specify the buffer size, it's just a more convenient
+    // alternative to creating wxStreamBuffer, calling its SetBufferIO(bufsize)
+    // and using the ctor above
+    wxBufferedInputStream(wxInputStream& stream, size_t bufsize);
+
+

     virtual ~wxBufferedInputStream();
 
     char Peek();
     virtual ~wxBufferedInputStream();
 
     char Peek();


@@ -500,8 +567,10 @@ public:
     void SetInputStreamBuffer(wxStreamBuffer *buffer);
     wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
 
     void SetInputStreamBuffer(wxStreamBuffer *buffer);
     wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
 

+#if WXWIN_COMPATIBILITY_2_6

     // deprecated, for compatibility only
     // deprecated, for compatibility only

-    wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
+    wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const );
+#endif // WXWIN_COMPATIBILITY_2_6

 
 protected:
     virtual size_t OnSysRead(void *buffer, size_t bufsize);
 
 protected:
     virtual size_t OnSysRead(void *buffer, size_t bufsize);


@@ -510,7 +579,7 @@ protected:
 
     wxStreamBuffer *m_i_streambuf;
 
 
     wxStreamBuffer *m_i_streambuf;
 

-    DECLARE_NO_COPY_CLASS(wxBufferedInputStream)
+    wxDECLARE_NO_COPY_CLASS(wxBufferedInputStream);

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


@@ -520,9 +589,18 @@ protected:
 class WXDLLIMPEXP_BASE wxBufferedOutputStream : public wxFilterOutputStream
 {
 public:
 class WXDLLIMPEXP_BASE wxBufferedOutputStream : public wxFilterOutputStream
 {
 public:

-    // if a non NULL buffer is given to the stream, it will be deleted by it
+    // create a buffered stream on top of the specified low-level stream
+    //
+    // if a non NULL buffer is given to the stream, it will be deleted by it,
+    // otherwise a default 1KB buffer will be used

     wxBufferedOutputStream(wxOutputStream& stream,
                            wxStreamBuffer *buffer = NULL);
     wxBufferedOutputStream(wxOutputStream& stream,
                            wxStreamBuffer *buffer = NULL);

+
+    // ctor allowing to specify the buffer size, it's just a more convenient
+    // alternative to creating wxStreamBuffer, calling its SetBufferIO(bufsize)
+    // and using the ctor above
+    wxBufferedOutputStream(wxOutputStream& stream, size_t bufsize);
+

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


@@ -541,8 +619,10 @@ public:
     void SetOutputStreamBuffer(wxStreamBuffer *buffer);
     wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
 
     void SetOutputStreamBuffer(wxStreamBuffer *buffer);
     wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
 

+#if WXWIN_COMPATIBILITY_2_6

     // deprecated, for compatibility only
     // deprecated, for compatibility only

-    wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; }
+    wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const );
+#endif // WXWIN_COMPATIBILITY_2_6

 
 protected:
     virtual size_t OnSysWrite(const void *buffer, size_t bufsize);
 
 protected:
     virtual size_t OnSysWrite(const void *buffer, size_t bufsize);


@@ -551,10 +631,63 @@ protected:
 
     wxStreamBuffer *m_o_streambuf;
 
 
     wxStreamBuffer *m_o_streambuf;
 

-    DECLARE_NO_COPY_CLASS(wxBufferedOutputStream)
+    wxDECLARE_NO_COPY_CLASS(wxBufferedOutputStream);
+};
+
+#if WXWIN_COMPATIBILITY_2_6
+    inline wxStreamBase *wxStreamBuffer::Stream() { return m_stream; }
+    inline wxStreamBuffer *wxBufferedInputStream::InputStreamBuffer() const { return m_i_streambuf; }
+    inline wxStreamBuffer *wxBufferedOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
+#endif // WXWIN_COMPATIBILITY_2_6
+
+// ---------------------------------------------------------------------------
+// wxWrapperInputStream: forwards all IO to another stream.
+// ---------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxWrapperInputStream : public wxFilterInputStream
+{
+public:
+    // Constructor fully initializing the stream. The overload taking pointer
+    // takes ownership of the parent stream, the one taking reference does not.
+    //
+    // Notice that this class also has a default ctor but it's protected as the
+    // derived class is supposed to take care of calling InitParentStream() if
+    // it's used.
+    wxWrapperInputStream(wxInputStream& stream);
+    wxWrapperInputStream(wxInputStream* stream);
+
+    // Override the base class methods to forward to the wrapped stream.
+    virtual wxFileOffset GetLength() const;
+    virtual bool IsSeekable() const;
+
+protected:
+    virtual size_t OnSysRead(void *buffer, size_t size);
+    virtual wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
+    virtual wxFileOffset OnSysTell() const;
+
+    // Ensure that our own last error is the same as that of the real stream.
+    //
+    // This method is const because the error must be updated even from const
+    // methods (in other words, it really should have been mutable in the first
+    // place).
+    void SynchronizeLastError() const
+    {
+        const_cast<wxWrapperInputStream*>(this)->
+            Reset(m_parent_i_stream->GetLastError());
+    }
+
+    // Default constructor, use InitParentStream() later.
+    wxWrapperInputStream();
+
+    // Set up the wrapped stream for an object initialized using the default
+    // constructor. The ownership logic is the same as above.
+    void InitParentStream(wxInputStream& stream);
+    void InitParentStream(wxInputStream* stream);
+
+    wxDECLARE_NO_COPY_CLASS(wxWrapperInputStream);

 };
 
 };
 

+

 #endif // wxUSE_STREAMS
 
 #endif // _WX_WXSTREAM_H__
 #endif // wxUSE_STREAMS
 
 #endif // _WX_WXSTREAM_H__

-