X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8f7173abc4a901249df3ae13a91d3f19874ac269..832e44d38a9c283ea1b03a76f80efb52519de21f:/include/wx/stream.h diff --git a/include/wx/stream.h b/include/wx/stream.h index d9fe1b89c0..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: @@ -38,262 +38,369 @@ WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream); // wxStream: base classes // --------------------------------------------------------------------------- +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 - -typedef enum { - wxStream_NOERROR = 0, - wxStream_EOF, - wxStream_WRITE_ERR, - wxStream_READ_ERR -} wxStreamError; - -class WXDLLEXPORT wxStreamBase { - public: - wxStreamBase(); - virtual ~wxStreamBase(); - - bool operator!() const { return (LastError() != wxSTREAM_NOERROR); } - wxStreamError LastError() const { return m_lasterror; } - virtual size_t GetSize() const { return ~((size_t)0); } - size_t StreamSize() const { return GetSize(); } - - 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; + +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(); - // IO functions - virtual char Peek(); - char GetC(); - virtual wxInputStream& Read(void *buffer, size_t size); - wxInputStream& Read(wxOutputStream& stream_out); + // is the stream at EOF? + virtual bool Eof() const; - // Position functions - virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart); - virtual off_t TellI() const; + // IO functions + virtual char Peek(); + char GetC(); + virtual wxInputStream& Read(void *buffer, size_t size); + wxInputStream& Read(wxOutputStream& stream_out); - // State functions - virtual size_t LastRead() { return wxStreamBase::m_lastcount; } + // Position functions + virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart); + virtual off_t TellI() const; - // Ungetch - size_t Ungetch(const void *buffer, size_t size); - bool Ungetch(char c); + // State functions + virtual size_t LastRead() { return wxStreamBase::m_lastcount; } - // Operators - wxInputStream& operator>>(wxOutputStream& out) { return Read(out); } -#if wxUSE_SERIAL - wxInputStream& operator>>(wxObject *& obj); -#endif - wxInputStream& operator>>( __wxInputManip func) { return func(*this); } + // Ungetch + size_t Ungetch(const void *buffer, size_t size); + bool Ungetch(char c); + + // Operators + wxInputStream& operator>>(wxOutputStream& out) { return Read(out); } + 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); - protected: - // Ungetch managers - char *m_wback; - size_t m_wbacksize; - size_t m_wbackcur; + // 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); + 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); } -#if wxUSE_SERIAL - wxOutputStream& operator<<(wxObject& obj); -#endif - wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); } + wxOutputStream& operator<<(wxInputStream& out) { return Write(out); } + 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(); } - wxStreamError LastError() const { return m_parent_i_stream->LastError(); } - size_t GetSize() const { return m_parent_i_stream->GetSize(); } + size_t GetSize() const { return m_parent_i_stream->GetSize(); } - protected: - wxInputStream *m_parent_i_stream; + wxInputStream *GetFilterInputStream() const { return 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(); + + size_t GetSize() const { return m_parent_o_stream->GetSize(); } - wxStreamError LastError() const { return m_parent_o_stream->LastError(); } - size_t GetSize() const { return m_parent_o_stream->GetSize(); } + wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; } - protected: - wxOutputStream *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(); - wxInputStream& Read(void *buffer, size_t size); - - // Position functions - off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart); - off_t TellI() const; + char Peek(); + wxInputStream& Read(void *buffer, size_t size); - wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; } + // Position functions + off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart); + off_t TellI() const; - protected: - size_t OnSysRead(void *buffer, size_t bufsize); - off_t OnSysSeek(off_t seek, wxSeekMode mode); - off_t OnSysTell() const; + // the buffer given to the stream will be deleted by it + void SetInputStreamBuffer(wxStreamBuffer *buffer); + wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; } - protected: - wxStreamBuffer *m_i_streambuf; + // deprecated, for compatibility only + wxStreamBuffer *InputStreamBuffer() const { return 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; - 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(); - void Sync(); + size_t GetSize() const; - wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; } + // the buffer given to the stream will be deleted by it + void SetOutputStreamBuffer(wxStreamBuffer *buffer); + wxStreamBuffer *GetOutputStreamBuffer() 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; + // deprecated, for compatibility only + wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; } - protected: - wxStreamBuffer *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 - // wxUSE_STREAMS +#endif // wxUSE_STREAMS + +#endif // _WX_WXSTREAM_H__ -#endif - // _WX_WXSTREAM_H__