remove unused variable assignment, closes #14928

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

diff --git a/include/wx/stream.h b/include/wx/stream.h
index 62dced04473ba7f5ddaa730d8547d98e2a39cafb..80c81bcbdc0a8f32bd6aeb1de583dee4cb36fd29 100644 (file)
--- a/include/wx/stream.h
+++ b/include/wx/stream.h
@@ -21,9 +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&);


@@ -42,6 +42,8 @@ enum wxStreamError
     wxSTREAM_READ_ERROR         // generic read error
 };
 
     wxSTREAM_READ_ERROR         // generic read error
 };
 

+const int wxEOF = -1;
+

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


@@ -50,7 +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();


@@ -62,7 +64,7 @@ public:
     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;


@@ -80,7 +82,8 @@ protected:
 
     friend class wxStreamBuffer;
 
 
     friend class wxStreamBuffer;
 

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

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


@@ -106,11 +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
     //


@@ -214,7 +217,8 @@ protected:
 
     friend class wxStreamBuffer;
 
 
     friend class wxStreamBuffer;
 

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

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


@@ -249,7 +253,8 @@ protected:
 
     friend class wxStreamBuffer;
 
 
     friend class wxStreamBuffer;
 

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

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


@@ -276,7 +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);

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


@@ -301,7 +307,8 @@ protected:
     wxInputStream *m_parent_i_stream;
     bool m_owns;
 
     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


@@ -322,7 +329,8 @@ protected:
     wxOutputStream *m_parent_o_stream;
     bool m_owns;
 
     wxOutputStream *m_parent_o_stream;
     bool m_owns;
 

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

 };
 
 enum wxStreamProtocolType
 };
 
 enum wxStreamProtocolType


@@ -346,12 +354,12 @@ public:
     virtual const wxChar * const *GetProtocols(wxStreamProtocolType type
                                                = wxSTREAM_PROTOCOL) const = 0;
 
     virtual const wxChar * const *GetProtocols(wxStreamProtocolType type
                                                = wxSTREAM_PROTOCOL) const = 0;
 

-    bool CanHandle(const wxChar *protocol,
+    bool CanHandle(const wxString& protocol,

                    wxStreamProtocolType type
                    = wxSTREAM_PROTOCOL) const;
 
 protected:
                    wxStreamProtocolType type
                    = wxSTREAM_PROTOCOL) const;
 
 protected:

-    wxString::size_type FindExtension(const wxChar *location) const;
+    wxString::size_type FindExtension(const wxString& location) const;

 
     DECLARE_ABSTRACT_CLASS(wxFilterClassFactoryBase)
 };
 
     DECLARE_ABSTRACT_CLASS(wxFilterClassFactoryBase)
 };


@@ -366,7 +374,7 @@ public:
     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 wxChar *protocol,
+    static const wxFilterClassFactory *Find(const wxString& protocol,

                                             wxStreamProtocolType type
                                             = wxSTREAM_PROTOCOL);
 
                                             wxStreamProtocolType type
                                             = wxSTREAM_PROTOCOL);
 


@@ -408,7 +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();
 


@@ -426,6 +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()


@@ -435,7 +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; }


@@ -450,7 +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; }


@@ -478,6 +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();
 


@@ -490,10 +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;
 


@@ -505,13 +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);

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


@@ -521,9 +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();


@@ -550,7 +579,7 @@ protected:
 
     wxStreamBuffer *m_i_streambuf;
 
 
     wxStreamBuffer *m_i_streambuf;
 

-    DECLARE_NO_COPY_CLASS(wxBufferedInputStream)
+    wxDECLARE_NO_COPY_CLASS(wxBufferedInputStream);

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


@@ -560,9 +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);


@@ -593,7 +631,7 @@ protected:
 
     wxStreamBuffer *m_o_streambuf;
 
 
     wxStreamBuffer *m_o_streambuf;
 

-    DECLARE_NO_COPY_CLASS(wxBufferedOutputStream)
+    wxDECLARE_NO_COPY_CLASS(wxBufferedOutputStream);

 };
 
 #if WXWIN_COMPATIBILITY_2_6
 };
 
 #if WXWIN_COMPATIBILITY_2_6


@@ -602,6 +640,54 @@ protected:
     inline wxStreamBuffer *wxBufferedOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
 #endif // WXWIN_COMPATIBILITY_2_6
 
     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__