Trying to hide evidence of my negative programming skills...

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

diff --git a/include/wx/stream.h b/include/wx/stream.h
index b467990588641fa6b0c43d9b558a80328a4b7299..00bf592d09905892557b282a10d9c9e694212c7e 100644 (file)
--- a/include/wx/stream.h
+++ b/include/wx/stream.h
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        stream.h
+// Name:        wx/stream.h

 // Purpose:     "wxWindows stream" base classes
 // Author:      Guilhem Lavaux
 // Modified by:
 // Purpose:     "wxWindows stream" base classes
 // Author:      Guilhem Lavaux
 // Modified by:


@@ -16,232 +16,397 @@
 #pragma interface
 #endif
 
 #pragma interface
 #endif
 

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

 #include <stdio.h>
 #include "wx/object.h"
 #include "wx/string.h"
 #include "wx/filefn.h"  // for off_t, wxInvalidOffset and wxSeekMode
 
 #include <stdio.h>
 #include "wx/object.h"
 #include "wx/string.h"
 #include "wx/filefn.h"  // for off_t, wxInvalidOffset and wxSeekMode
 

+class WXDLLEXPORT wxStreamBase;

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

-wxOutputStream& WXDLLEXPORT wxEndL(wxOutputStream& o_stream);
+WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream);

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

-// Stream buffer
+// wxStream: base classes

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

-class WXDLLEXPORT wxStreamBuffer {
- public:
-  wxStreamBuffer(wxInputStream& stream);
-  wxStreamBuffer(wxOutputStream& stream);
-  ~wxStreamBuffer();
-
-  void Read(void *buffer, size_t size);
-  void Write(const void *buffer, size_t size);
-  void WriteBack(char c);
-
-  void SetBufferIO(char *buffer_start, char *buffer_end);
-  void SetBufferIO(size_t bufsize);
-  void ResetBuffer(); 
-
-  void SetBufferPosition(char *buffer_position)
-                                  { m_buffer_pos = buffer_position; }
-  void SetIntPosition(size_t pos)
-                     { m_buffer_pos = m_buffer_start + pos; }
-  char *GetBufferPosition() const { return m_buffer_pos; }
-  size_t GetIntPosition() const { return m_buffer_pos - m_buffer_start; }
-  
-  char *GetBufferStart() const    { return m_buffer_start; }
-  char *GetBufferEnd() const      { return m_buffer_end; }
-  size_t GetBufferSize() const    { return m_buffer_size; }
-  size_t GetLastAccess() const      { return m_buffer_end - m_buffer_start; }
-
- protected:
-  char *m_buffer_start, *m_buffer_end, *m_buffer_pos;
-  size_t m_buffer_size;
-
-  wxInputStream *m_istream;
-  wxOutputStream *m_ostream;
+enum wxStreamError
+{
+    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

 };
 
 };
 

-// ---------------------------------------------------------------------------
-// wxStream: base classes
-// ---------------------------------------------------------------------------
+// compatibility
+#define wxStream_NOERROR    wxSTREAM_NOERROR
+#define wxStream_EOF        wxSTREAM_EOF
+#define wxStream_WRITE_ERR  wxSTREAM_WRITE_ERROR
+#define wxStream_READ_ERR   wxSTREAM_READ_ERROR

 
 

-class WXDLLEXPORT wxInputStream {
- public:
-  wxInputStream();
-  virtual ~wxInputStream();
-
-  // IO functions
-  virtual char Peek() { return 0; }
-  virtual char GetC();
-  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;
-
-  // State functions
-  bool Eof() const { return m_eof; }
-  size_t LastRead() { return m_lastread; }
-  wxStreamBuffer *InputStreamBuffer() { return m_i_streambuf; }
-
-  // Operators
-  wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
-  wxInputStream& operator>>(wxString& line);
-  wxInputStream& operator>>(char& c);
-  wxInputStream& operator>>(short& i);
-  wxInputStream& operator>>(int& i);
-  wxInputStream& operator>>(long& i);
-  wxInputStream& operator>>(float& i);
-#if USE_SERIAL
-  wxInputStream& operator>>(wxObject *& obj);
+class WXDLLEXPORT wxStreamBase
+{
+public:
+    wxStreamBase();
+    virtual ~wxStreamBase();
+
+    // error testing
+    wxStreamError GetLastError() const { return m_lasterror; }
+    bool IsOk() const { return LastError() == wxSTREAM_NOERROR; }
+    bool operator!() const { return LastError() != wxSTREAM_NOERROR; }
+
+    virtual size_t GetSize() const { return 0; }
+
+    // deprecated, for compatibility only
+    wxStreamError LastError() const { return m_lasterror; }
+    size_t StreamSize() const { return GetSize(); }
+
+protected:
+    // VZ: these functions are really pure virtual and shouldn't be declared
+    //     in the base class because it creates ambiguties in stream classes
+    //     deriving from both wxInputStream and wxOutputStream
+#if 0
+    virtual size_t OnSysRead(void *buffer, size_t bufsize);
+    virtual size_t OnSysWrite(const void *buffer, size_t bufsize);

 #endif
 
 #endif
 

-  wxInputStream& operator>>(unsigned char& c) { return operator>>((char&)c); }
-  wxInputStream& operator>>(unsigned short& i) { return operator>>((short&)i); }
-  wxInputStream& operator>>(unsigned int& i) { return operator>>((int&)i); }
-  wxInputStream& operator>>(unsigned long& i) { return operator>>((long&)i); }
-  wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
-
- protected:
-  friend class wxStreamBuffer;
-  friend class wxFilterInputStream;
-
-  wxInputStream(wxStreamBuffer *buffer);
-
-  virtual size_t DoRead(void *WXUNUSED(buffer), size_t WXUNUSED(size) ) 
-         { return 0; }
-  virtual off_t DoSeekInput( off_t WXUNUSED(pos), wxSeekMode WXUNUSED(mode) )
-         { return wxInvalidOffset; }
-  virtual off_t DoTellInput() const
-         { return wxInvalidOffset; }
-
- protected:
-  bool m_eof, m_i_destroybuf;
-  size_t m_lastread;
-  wxStreamBuffer *m_i_streambuf;
+    virtual off_t OnSysSeek(off_t seek, wxSeekMode mode);
+    virtual off_t OnSysTell() const;
+
+    friend class wxStreamBuffer;
+
+    size_t m_lastcount;
+    wxStreamError m_lasterror;

 };
 
 };
 

-class WXDLLEXPORT wxOutputStream {
- public:
-  wxOutputStream();
-  virtual ~wxOutputStream();
-
-  virtual wxOutputStream& Write(const void *buffer, size_t size);
-  wxOutputStream& Write(wxInputStream& stream_in);
-
-  virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
-  virtual off_t TellO() const;
-
-  virtual bool Bad() const { return m_bad; }
-  virtual size_t LastWrite() const { return m_lastwrite; }
-  wxStreamBuffer *OutputStreamBuffer() { return m_o_streambuf; }
-
-  virtual void Sync();
-
-  wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
-  wxOutputStream& operator<<(const char *string);
-  wxOutputStream& operator<<(wxString& string);
-  wxOutputStream& operator<<(char c);
-  wxOutputStream& operator<<(short i);
-  wxOutputStream& operator<<(int i);
-  wxOutputStream& operator<<(long i);
-  wxOutputStream& operator<<(double f);
-#if USE_SERIAL
-  wxOutputStream& operator<<(wxObject& obj);
+class WXDLLEXPORT wxInputStream : /* virtual */ public wxStreamBase
+{
+public:
+    wxInputStream();
+    virtual ~wxInputStream();
+
+    // is the stream at EOF?
+    virtual bool Eof() const;
+
+    // IO functions
+    virtual char Peek();
+    char GetC();
+    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;
+
+    // State functions
+    virtual size_t LastRead() { return wxStreamBase::m_lastcount; }
+
+    // Ungetch
+    size_t Ungetch(const void *buffer, size_t size);
+    bool Ungetch(char c);
+
+    // Operators
+    wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
+#if wxUSE_SERIAL
+    wxInputStream& operator>>(wxObject *& obj);

 #endif
 #endif

+    wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
+
+protected:
+    // to be implemented in the derived classes (it should have been pure
+    // virtual)
+    virtual size_t OnSysRead(void *buffer, size_t bufsize);
+
+    // Ungetch managers
+    char *m_wback;
+    size_t m_wbacksize;
+    size_t m_wbackcur;
+
+    char *AllocSpaceWBack(size_t needed_size);
+    size_t GetWBack(void *buf, size_t bsize);

 
 

-  wxOutputStream& operator<<(float f) { return operator<<((double)f); }
-  wxOutputStream& operator<<(unsigned char c) { return operator<<((char)c); }
-  wxOutputStream& operator<<(unsigned short i) { return operator<<((short)i); }
-  wxOutputStream& operator<<(unsigned int i) { return operator<<((int)i); }
-  wxOutputStream& operator<<(unsigned long i) { return operator<<((long)i); }
-  wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); }
-
- protected:
-  friend class wxStreamBuffer;
-  friend class wxFilterOutputStream;
-
-  wxOutputStream(wxStreamBuffer *buffer);
-
-  virtual size_t DoWrite( const void *WXUNUSED(buffer), size_t WXUNUSED(size) ) 
-            { return 0; }
-  virtual off_t DoSeekOutput( off_t WXUNUSED(pos), wxSeekMode WXUNUSED(mode) )
-            { return wxInvalidOffset; }
-  virtual off_t DoTellOutput() const
-            { return wxInvalidOffset; }
-
- protected:
-  bool m_bad, m_o_destroybuf;
-  size_t m_lastwrite;
-  wxStreamBuffer *m_o_streambuf;
+    friend class wxStreamBuffer;

 };
 
 };
 

-class wxStream: public virtual wxInputStream,
-               public virtual wxOutputStream
+class WXDLLEXPORT wxOutputStream : /* virtual */ public wxStreamBase

 {
 {

- public:
-  wxStream();
+public:
+    wxOutputStream();
+    virtual ~wxOutputStream();
+
+    void PutC(char c);
+    virtual wxOutputStream& Write(const void *buffer, size_t size);
+    wxOutputStream& Write(wxInputStream& stream_in);
+
+    virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
+    virtual off_t TellO() const;
+
+    virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; }
+
+    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); }
+
+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;
+};
+
+// ---------------------------------------------------------------------------
+// A stream for measuring streamed output
+// ---------------------------------------------------------------------------
+
+class WXDLLEXPORT wxCountingOutputStream : public wxOutputStream
+{
+public:
+    wxCountingOutputStream();
+
+    size_t GetSize() const;
+    bool Ok() const { return TRUE; }
+
+protected:
+    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;

 };
 
 // ---------------------------------------------------------------------------
 // "Filter" streams
 // ---------------------------------------------------------------------------
 
 };
 
 // ---------------------------------------------------------------------------
 // "Filter" streams
 // ---------------------------------------------------------------------------
 

-class WXDLLEXPORT wxFilterInputStream: public virtual wxInputStream {
- public:
-  wxFilterInputStream();
-  wxFilterInputStream(wxInputStream& stream);
-  ~wxFilterInputStream();
+class WXDLLEXPORT wxFilterInputStream : public wxInputStream
+{
+public:
+    wxFilterInputStream();
+    wxFilterInputStream(wxInputStream& stream);
+    virtual ~wxFilterInputStream();
+
+    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;
+};
+
+class WXDLLEXPORT wxFilterOutputStream : public wxOutputStream
+{
+public:
+    wxFilterOutputStream();
+    wxFilterOutputStream(wxOutputStream& stream);
+    virtual ~wxFilterOutputStream();
+
+    size_t GetSize() const { return m_parent_o_stream->GetSize(); }

 
 

-  char Peek() { return m_parent_i_stream->Peek(); }
+    wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; }

 
 

-  bool Eof() const { return m_parent_i_stream->Eof(); } 
-  size_t LastRead() const { return m_parent_i_stream->LastRead(); } 
-  off_t TellI() const { return m_parent_i_stream->TellI(); }
+protected:
+    wxOutputStream *m_parent_o_stream;
+};

 
 

- protected:
-  size_t DoRead(void *buffer, size_t size);
-  off_t DoSeekInput(off_t pos, wxSeekMode mode);
-  off_t DoTellInput() const;
+// ---------------------------------------------------------------------------
+// Stream buffer: this class can be derived from and passed to
+// wxBufferedStreams to implement custom buffering
+// ---------------------------------------------------------------------------

 
 

- protected:
-  wxInputStream *m_parent_i_stream;
+class WXDLLEXPORT wxStreamBuffer
+{
+public:
+    enum BufMode
+    {
+        read,
+        write,
+        read_write
+    };
+
+    wxStreamBuffer(wxStreamBase& stream, BufMode mode);
+    wxStreamBuffer(BufMode mode);
+    wxStreamBuffer(const wxStreamBuffer& buf);
+    virtual ~wxStreamBuffer();
+
+    // Filtered IO
+    virtual size_t Read(void *buffer, size_t size);
+    size_t Read(wxStreamBuffer *buf);
+    virtual size_t Write(const void *buffer, size_t size);
+    size_t Write(wxStreamBuffer *buf);
+
+    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();
+
+    // 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 *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; }
+
+    bool FlushBuffer();
+    bool FillBuffer();
+    size_t GetDataLeft();
+
+    // 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; }
+
+protected:
+    void GetFromBuffer(void *buffer, size_t size);
+    void PutToBuffer(const void *buffer, size_t size);
+
+    // set the last error to the specified value if we didn't have it before
+    void SetError(wxStreamError err);
+
+    // 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;
+
+    // its mode
+    BufMode m_mode;
+
+    // flags
+    bool m_destroybuf,      // deallocate buffer?
+         m_destroystream,   // delete associated stream?
+         m_fixed,
+         m_flushable;

 };
 
 };
 

-class WXDLLEXPORT wxFilterOutputStream: public virtual wxOutputStream {
- public:
-  wxFilterOutputStream();
-  wxFilterOutputStream(wxOutputStream& stream);
-  virtual ~wxFilterOutputStream();
+// ---------------------------------------------------------------------------
+// wxBufferedStreams
+// ---------------------------------------------------------------------------
+
+class WXDLLEXPORT wxBufferedInputStream : public wxFilterInputStream
+{
+public:
+    // 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);
+
+    // Position functions
+    off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
+    off_t TellI() const;

 
 

-  bool Bad() const { return m_parent_o_stream->Bad(); }
-  size_t LastWrite() const { return m_parent_o_stream->LastWrite(); }
-  off_t TellO() const { return m_parent_o_stream->TellO(); }
+    // the buffer given to the stream will be deleted by it
+    void SetInputStreamBuffer(wxStreamBuffer *buffer);
+    wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }

 
 

- protected:
-  // The forward is implicitely done by wxStreamBuffer.
+    // deprecated, for compatibility only
+    wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }

 
 

-  size_t DoWrite(const void *buffer, size_t size);
-  off_t DoSeekOutput(off_t pos, wxSeekMode mode);
-  off_t DoTellOutput() const;
+protected:
+    virtual size_t OnSysRead(void *buffer, size_t bufsize);
+    virtual off_t OnSysSeek(off_t seek, wxSeekMode mode);
+    virtual off_t OnSysTell() const;

 
 

- protected:
-  wxOutputStream *m_parent_o_stream;
+    wxStreamBuffer *m_i_streambuf;

 };
 
 };
 

-class WXDLLEXPORT wxFilterStream: public wxStream,
-                                 public virtual wxFilterInputStream,
-                                 public virtual wxFilterOutputStream {
- public:
-  wxFilterStream(wxStream& stream);
-  wxFilterStream();
+class WXDLLEXPORT wxBufferedOutputStream : public wxFilterOutputStream
+{
+public:
+    // 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);
+
+    // Position functions
+    off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
+    off_t TellO() 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:
+    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;

 };
 
 };
 

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