X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/657d209757c4ba3ce214e776d4d7ce6a99b321c9..32f8e36335fbd7116593bf57917a9be294cae363:/include/wx/stream.h diff --git a/include/wx/stream.h b/include/wx/stream.h index e4a184619e..d035bde1cf 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: @@ -38,25 +38,26 @@ WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream); // 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 { @@ -64,14 +65,26 @@ public: 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; @@ -81,12 +94,15 @@ protected: 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(); @@ -106,22 +122,25 @@ public: // Operators wxInputStream& operator>>(wxOutputStream& out) { return Read(out); } -#if wxUSE_SERIAL - wxInputStream& operator>>(wxObject *& obj); -#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(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(); @@ -139,17 +158,21 @@ public: 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 wxCountingOutputStream: public wxOutputStream +class WXDLLEXPORT wxCountingOutputStream : public wxOutputStream { public: wxCountingOutputStream(); @@ -158,84 +181,97 @@ public: 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; } @@ -244,32 +280,70 @@ public: 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(); + + // 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; - bool m_fixed, m_flushable; + // 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 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); @@ -278,21 +352,28 @@ public: 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 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); @@ -304,18 +385,22 @@ public: 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__