/////////////////////////////////////////////////////////////////////////////
-// Name: stream.h
+// Name: wx/stream.h
// Purpose: "wxWindows stream" base classes
// Author: Guilhem Lavaux
// Modified by:
// wxStream: base 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,
+enum wxStreamError
+{
+ wxSTREAM_NO_ERROR = 0,
+ wxSTREAM_NO_ERR = wxSTREAM_NO_ERROR,
+ wxSTREAM_NOERROR = wxSTREAM_NO_ERROR,
- wxSTREAM_EOF,
+ wxSTREAM_EOF,
- wxSTREAM_WRITE_ERROR,
- wxSTREAM_WRITE_ERR = wxSTREAM_WRITE_ERROR,
+ wxSTREAM_WRITE_ERROR,
+ wxSTREAM_WRITE_ERR = wxSTREAM_WRITE_ERROR,
- wxSTREAM_READ_ERROR,
- wxSTREAM_READ_ERR = wxSTREAM_READ_ERROR
+ wxSTREAM_READ_ERROR,
+ wxSTREAM_READ_ERR = wxSTREAM_READ_ERROR
+};
-} wxStreamError;
+// 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
{
wxStreamBase();
virtual ~wxStreamBase();
- bool operator!() const { return (LastError() != wxSTREAM_NOERROR); }
+ // 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; }
- virtual size_t GetSize() const { return ~((size_t)0); }
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;
wxStreamError m_lasterror;
};
-class WXDLLEXPORT wxInputStream: public wxStreamBase
+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();
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(char *buf, size_t bsize);
+ size_t GetWBack(void *buf, size_t bsize);
+
+ friend class wxStreamBuffer;
};
-class WXDLLEXPORT wxOutputStream: public wxStreamBase
+class WXDLLEXPORT wxOutputStream : /* virtual */ public wxStreamBase
{
public:
wxOutputStream();
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 wxCountingOutputStream: public wxOutputStream
+class WXDLLEXPORT wxCountingOutputStream : public wxOutputStream
{
public:
wxCountingOutputStream();
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;
};
-
// ---------------------------------------------------------------------------
// "Filter" streams
// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxFilterInputStream: public wxInputStream
+class WXDLLEXPORT wxFilterInputStream : public wxInputStream
{
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(); }
+ wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; }
+
protected:
wxInputStream *m_parent_i_stream;
};
-class WXDLLEXPORT wxFilterOutputStream: public wxOutputStream
+class WXDLLEXPORT wxFilterOutputStream : public wxOutputStream
{
public:
wxFilterOutputStream();
wxFilterOutputStream(wxOutputStream& stream);
- ~wxFilterOutputStream();
+ virtual ~wxFilterOutputStream();
size_t GetSize() const { return m_parent_o_stream->GetSize(); }
+ 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;
+ enum BufMode
+ {
+ read,
+ write,
+ read_write
+ };
wxStreamBuffer(wxStreamBase& stream, BufMode mode);
wxStreamBuffer(BufMode mode);
wxStreamBuffer(const wxStreamBuffer& buf);
- ~wxStreamBuffer();
+ virtual ~wxStreamBuffer();
// 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 Write(const void *buffer, size_t size);
+ virtual size_t Write(const void *buffer, size_t size);
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();
- 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);
- 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; }
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; }
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);
+
+ // common part of several ctors
+ void Init();
+
+ // init buffer variables to be empty
+ void InitBuffer();
- bool m_fixed, m_flushable;
+ // 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;
- bool m_destroybuf, m_destroystream;
+
+ // flags
+ bool m_destroybuf, // deallocate buffer?
+ m_destroystream, // delete associated stream?
+ m_fixed,
+ m_flushable;
};
// ---------------------------------------------------------------------------
// wxBufferedStreams
// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxBufferedInputStream: public wxFilterInputStream
+class WXDLLEXPORT wxBufferedInputStream : public wxFilterInputStream
{
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);
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:
- 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;
};
-class WXDLLEXPORT wxBufferedOutputStream: public wxFilterOutputStream
+class WXDLLEXPORT wxBufferedOutputStream : public wxFilterOutputStream
{
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);
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:
- 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;
};
-#endif
- // wxUSE_STREAMS
+#endif // wxUSE_STREAMS
+
+#endif // _WX_WXSTREAM_H__
-#endif
- // _WX_WXSTREAM_H__
projects / wxWidgets.git / blobdiff