X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fae05df5a988883e9c6683ccded766dfb7b84b1b..b1d66b5415f7befb45e050d7097571642b8bfa56:/include/wx/stream.h

diff --git a/include/wx/stream.h b/include/wx/stream.h
index 7e0045323c..00bf592d09 100644
--- 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:
@@ -38,260 +38,375 @@ WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream);
 // wxStream: base classes
 // ---------------------------------------------------------------------------
 
-#define wxStream_NOERROR    wxSTR_NOERROR
-#define wxStream_EOF        wxSTR_EOF
-#define wxStream_WRITE_ERR  wxSTR_WRITE_ERROR
-#define wxStream_READ_ERR   wxSTR_READ_ERROR
-  
-typedef enum {
-  wxStream_NOERROR = 0,
-  wxStream_EOF,
-  wxStream_WRITE_ERR,
-  wxStream_READ_ERR
-} wxStreamError;
-
-class WXDLLEXPORT wxStreamBase {
- public:
-  wxStreamBase();
-  virtual ~wxStreamBase();
-
-  wxStreamError LastError() const { return m_lasterror; }
-  virtual size_t StreamSize() const { return ~((size_t)0); }
-
- 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;
-
- protected:
-  friend class wxStreamBuffer;
-
-  size_t m_lastcount;
-  wxStreamError m_lasterror;
+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
+};
+
+// 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 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
+
+    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 wxInputStream: public wxStreamBase {
- public:
-  wxInputStream();
-  virtual ~wxInputStream();
+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);
+    // 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;
+    // 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; }
+    // State functions
+    virtual size_t LastRead() { return wxStreamBase::m_lastcount; }
 
-  // Ungetch
-  size_t Ungetch(void *buffer, size_t size);
-  bool Ungetch(char c);
+    // Ungetch
+    size_t Ungetch(const void *buffer, size_t size);
+    bool Ungetch(char c);
 
-  // Operators
-  wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
+    // Operators
+    wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
 #if wxUSE_SERIAL
-  wxInputStream& operator>>(wxObject *& obj);
+    wxInputStream& operator>>(wxObject *& obj);
 #endif
-  wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
+    wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
 
- protected:
-  // Ungetch managers
-  char *m_wback;
-  size_t m_wbacksize;
-  size_t m_wbackcur;
+protected:
+    // to be implemented in the derived classes (it should have been pure
+    // virtual)
+    virtual size_t OnSysRead(void *buffer, size_t bufsize);
 
-  char *AllocSpaceWBack(size_t needed_size);
-  size_t GetWBack(char *buf, size_t bsize);
+    // 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);
+
+    friend class wxStreamBuffer;
 };
 
-class WXDLLEXPORT wxOutputStream: public wxStreamBase {
- public:
-  wxOutputStream();
-  virtual ~wxOutputStream();
+class WXDLLEXPORT wxOutputStream : /* virtual */ public wxStreamBase
+{
+public:
+    wxOutputStream();
+    virtual ~wxOutputStream();
 
-  virtual wxOutputStream& Write(const void *buffer, size_t size);
-  wxOutputStream& Write(wxInputStream& stream_in);
+    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 off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
+    virtual off_t TellO() const;
 
-  virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; }
+    virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; }
 
-  virtual void Sync();
+    virtual void Sync();
 
-  wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
+    wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
 #if wxUSE_SERIAL
-  wxOutputStream& operator<<(wxObject& obj);
+    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;
+};
+
+// ---------------------------------------------------------------------------
+// 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
 // ---------------------------------------------------------------------------
 
-class WXDLLEXPORT wxFilterInputStream: public 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(); }
 
-  char Peek() { return m_parent_i_stream->Peek(); }
+    size_t GetSize() const { return m_parent_i_stream->GetSize(); }
 
-  wxStreamError LastError() const { return m_parent_i_stream->LastError(); }
-  size_t StreamSize() const { return m_parent_i_stream->StreamSize(); }
+    wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; }
 
- protected:
-  wxInputStream *m_parent_i_stream;
+protected:
+    wxInputStream *m_parent_i_stream;
 };
 
-class WXDLLEXPORT wxFilterOutputStream: public wxOutputStream {
- public:
-  wxFilterOutputStream();
-  wxFilterOutputStream(wxOutputStream& stream);
-  ~wxFilterOutputStream();
+class WXDLLEXPORT wxFilterOutputStream : public wxOutputStream
+{
+public:
+    wxFilterOutputStream();
+    wxFilterOutputStream(wxOutputStream& stream);
+    virtual ~wxFilterOutputStream();
 
-  wxStreamError LastError() const { return m_parent_o_stream->LastError(); }
-  size_t StreamSize() const { return m_parent_o_stream->StreamSize(); }
+    size_t GetSize() const { return m_parent_o_stream->GetSize(); }
 
- protected:
-  wxOutputStream *m_parent_o_stream;
+    wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; }
+
+protected:
+    wxOutputStream *m_parent_o_stream;
 };
 
 // ---------------------------------------------------------------------------
-// Stream buffer
+// Stream buffer: this class can be derived from and passed to
+// wxBufferedStreams to implement custom buffering
 // ---------------------------------------------------------------------------
 
-class WXDLLEXPORT wxStreamBuffer {
- public:
-  typedef enum {
-    read = 0, write, read_write
-  } BufMode;
-
-  // -----------
-  // ctor & dtor
-  // -----------
-  wxStreamBuffer(wxStreamBase& stream, BufMode mode);
-  wxStreamBuffer(BufMode mode);
-  wxStreamBuffer(const wxStreamBuffer& buf);
-  ~wxStreamBuffer();
-
-  // -----------
-  // Filtered IO
-  // -----------
-  size_t Read(void *buffer, size_t size);
-  size_t Read(wxStreamBuffer *buf);
-  size_t Write(const void *buffer, size_t size);
-  size_t Write(wxStreamBuffer *buf);
-
-  char GetChar();
-  void PutChar(char c);
-  off_t Tell() const;
-  off_t Seek(off_t pos, wxSeekMode mode);
-
-  // --------------
-  // Buffer control
-  // --------------
-  void ResetBuffer();
-  void SetBufferIO(char *buffer_start, char *buffer_end);
-  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 Fixed(bool fixed) { m_fixed = fixed; }
-  void Flushable(bool f) { m_flushable = f; }
-
-  bool FlushBuffer();
-  bool FillBuffer();
-  size_t GetDataLeft();
-
-  // --------------
-  // Administration
-  // --------------
-  wxStreamBase *Stream() { return m_stream; }
-
- protected:
-  void GetFromBuffer(void *buffer, size_t size);
-  void PutToBuffer(const void *buffer, size_t size);
-
- protected:
-  char *m_buffer_start, *m_buffer_end, *m_buffer_pos;
-  size_t m_buffer_size;
-
-  char *m_wback;
-  size_t m_wbacksize, m_wbackcur;
-
-  bool m_fixed, m_flushable;
-
-  wxStreamBase *m_stream;
-  BufMode m_mode;
-  bool m_destroybuf, m_destroystream;
+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;
 };
 
 // ---------------------------------------------------------------------------
 // wxBufferedStreams
 // ---------------------------------------------------------------------------
 
-class wxBufferedInputStream: public wxFilterInputStream {
- public:
-  wxBufferedInputStream(wxInputStream& stream);
-  ~wxBufferedInputStream();
+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);
 
-  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;
 
-  wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
+    // the buffer given to the stream will be deleted by it
+    void SetInputStreamBuffer(wxStreamBuffer *buffer);
+    wxStreamBuffer *GetInputStreamBuffer() 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;  
+    // deprecated, for compatibility only
+    wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
 
- protected:
-  wxStreamBuffer *m_i_streambuf;
+protected:
+    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;
 };
 
-class wxBufferedOutputStream: public wxFilterOutputStream {
- public:
-  wxBufferedOutputStream(wxOutputStream& stream);
-  ~wxBufferedOutputStream();
+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();
 
-  wxOutputStream& Write(const void *buffer, size_t size);
-  
-  // Position functions
-  off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
-  off_t TellO() const;
+    size_t GetSize() const;
 
-  void Sync();
+    // the buffer given to the stream will be deleted by it
+    void SetOutputStreamBuffer(wxStreamBuffer *buffer);
+    wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
 
-  wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; }
+    // deprecated, for compatibility only
+    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;  
+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;
 
- protected:
-  wxStreamBuffer *m_o_streambuf;
+    wxStreamBuffer *m_o_streambuf;
 };
 
-#endif
-  // wxUSE_STREAMS
+#endif // wxUSE_STREAMS
+
+#endif // _WX_WXSTREAM_H__
 
-#endif
-  // _WX_WXSTREAM_H__