X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/7513f9ffc5f8f6e75d55cc32cafe5ea6a111fcfc..461573cc244a194f804e2bf0c8ba6a365e77c95c:/include/wx/stream.h diff --git a/include/wx/stream.h b/include/wx/stream.h index c2f6a3d45c..c65ac904a9 100644 --- a/include/wx/stream.h +++ b/include/wx/stream.h @@ -1,7 +1,7 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: stream.h -// Purpose: "wxWindows stream" base classes -// Author: Guilhem Lavaux +// Name: wx/stream.h +// Purpose: stream classes +// Author: Guilhem Lavaux, Guillermo Rodriguez Garcia, Vadim Zeitlin // Modified by: // Created: 11/07/98 // RCS-ID: $Id$ @@ -12,8 +12,8 @@ #ifndef _WX_WXSTREAM_H__ #define _WX_WXSTREAM_H__ -#ifdef __GNUG__ -#pragma interface +#if defined(__GNUG__) && !defined(__APPLE__) +#pragma interface "stream.h" #endif #include "wx/defs.h" @@ -34,286 +34,501 @@ typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&); WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream); +// ---------------------------------------------------------------------------- +// constants +// ---------------------------------------------------------------------------- + +enum wxStreamError +{ + wxSTREAM_NO_ERROR = 0, // stream is in good state + wxSTREAM_EOF, // EOF reached in Read() or similar + wxSTREAM_WRITE_ERROR, // generic write error + wxSTREAM_READ_ERROR // generic read error +}; + +// compatibility +#if WXWIN_COMPATIBILITY_2_2 + #define wxStream_NOERROR wxSTREAM_NOERROR + #define wxStream_EOF wxSTREAM_EOF + #define wxStream_WRITE_ERR wxSTREAM_WRITE_ERROR + #define wxStream_READ_ERR wxSTREAM_READ_ERROR + + #define wxSTREAM_NO_ERR wxSTREAM_NO_ERROR + #define wxSTREAM_NOERROR wxSTREAM_NO_ERROR + #define wxSTREAM_WRITE_ERR wxSTREAM_WRITE_ERROR + #define wxSTREAM_READ_ERR wxSTREAM_READ_ERROR +#endif // WXWIN_COMPATIBILITY_2_2 + +// ============================================================================ +// base stream classes: wxInputStream and wxOutputStream +// ============================================================================ + // --------------------------------------------------------------------------- -// wxStream: base classes +// wxStreamBase: common (but non virtual!) base for all stream 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_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 GetLastError() == wxSTREAM_NO_ERROR; } + bool operator!() const { return !IsOk(); } + + // reset the stream state + void Reset() { m_lasterror = wxSTREAM_NO_ERROR; } + + // deprecated (doesn't make sense!), don't use + virtual size_t GetSize() const { return 0; } + +#if WXWIN_COMPATIBILITY_2_2 + // deprecated, for compatibility only + wxStreamError LastError() const { return m_lasterror; } + size_t StreamSize() const { return GetSize(); } +#endif // WXWIN_COMPATIBILITY_2_2 + +protected: + virtual off_t OnSysSeek(off_t seek, wxSeekMode mode); + virtual off_t OnSysTell() const; + + size_t m_lastcount; + wxStreamError m_lasterror; + + friend class wxStreamBuffer; + + DECLARE_NO_COPY_CLASS(wxStreamBase) }; -class WXDLLEXPORT wxInputStream: public wxStreamBase { - public: - wxInputStream(); - virtual ~wxInputStream(); +// ---------------------------------------------------------------------------- +// wxInputStream: base class for the input streams +// ---------------------------------------------------------------------------- + +class WXDLLEXPORT wxInputStream : public wxStreamBase +{ +public: + // ctor and dtor, nothing exciting + wxInputStream(); + virtual ~wxInputStream(); + + + // IO functions + // ------------ + + // return a character from the stream without removing it, i.e. it will + // still be returned by the next call to GetC() + // + // blocks until something appears in the stream if necessary, if nothing + // ever does (i.e. EOF) LastRead() will return 0 (and the return value is + // undefined), otherwise 1 + virtual char Peek(); + + // return one character from the stream, blocking until it appears if + // necessary + // + // if EOF, return value is undefined and LastRead() will return 0 and not 1 + char GetC(); - // IO functions - virtual char Peek(); - char GetC(); - virtual wxInputStream& Read(void *buffer, size_t size); - wxInputStream& Read(wxOutputStream& stream_out); + // read at most the given number of bytes from the stream + // + // there are 2 possible situations here: either there is nothing at all in + // the stream right now in which case Read() blocks until something appears + // (use CanRead() to avoid this) or there is already some data available in + // the stream and then Read() doesn't block but returns just the data it + // can read without waiting for more + // + // in any case, if there are not enough bytes in the stream right now, + // LastRead() value will be less than size but greater than 0. If it is 0, + // it means that EOF has been reached. + virtual wxInputStream& Read(void *buffer, size_t size); - // Position functions - virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart); - virtual off_t TellI() const; + // copy the entire contents of this stream into streamOut, stopping only + // when EOF is reached or an error occurs + wxInputStream& Read(wxOutputStream& streamOut); - // State functions - virtual size_t LastRead() { return wxStreamBase::m_lastcount; } - // Ungetch - size_t Ungetch(const void *buffer, size_t size); - bool Ungetch(char c); + // status functions + // ---------------- - // Operators - wxInputStream& operator>>(wxOutputStream& out) { return Read(out); } -#if wxUSE_SERIAL - wxInputStream& operator>>(wxObject *& obj); -#endif - wxInputStream& operator>>( __wxInputManip func) { return func(*this); } + // returns the number of bytes read by the last call to Read(), GetC() or + // Peek() + // + // this should be used to discover whether that call succeeded in reading + // all the requested data or not + virtual size_t LastRead() const { return wxStreamBase::m_lastcount; } + + // returns TRUE if some data is available in the stream right now, so that + // calling Read() wouldn't block + virtual bool CanRead() const; + + // is the stream at EOF? + // + // note that this cannot be really implemented for all streams and + // CanRead() is more reliable than Eof() + virtual bool Eof() const; + + + // write back buffer + // ----------------- + + // put back the specified number of bytes into the stream, they will be + // fetched by the next call to the read functions + // + // returns the number of bytes really stuffed back + size_t Ungetch(const void *buffer, size_t size); + + // put back the specified character in the stream + // + // returns TRUE if ok, FALSE on error + bool Ungetch(char c); + + + // position functions + // ------------------ + + // move the stream pointer to the given position (if the stream supports + // it) + // + // returns wxInvalidOffset on error + virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart); + + // return the current position of the stream pointer or wxInvalidOffset + virtual off_t TellI() const; + + + // stream-like operators + // --------------------- - protected: - // Ungetch managers - char *m_wback; - size_t m_wbacksize; - size_t m_wbackcur; + wxInputStream& operator>>(wxOutputStream& out) { return Read(out); } + wxInputStream& operator>>(__wxInputManip func) { return func(*this); } + +protected: + // do read up to size bytes of data into the provided buffer + // + // this method should return 0 if EOF has been reached or an error occured + // (m_lasterror should be set accordingly as well) or the number of bytes + // read + virtual size_t OnSysRead(void *buffer, size_t size) = 0; - char *AllocSpaceWBack(size_t needed_size); - size_t GetWBack(char *buf, size_t bsize); + // write-back buffer support + // ------------------------- + + // return the pointer to a buffer big enough to hold sizeNeeded bytes + char *AllocSpaceWBack(size_t sizeNeeded); + + // read up to size data from the write back buffer, return the number of + // bytes read + size_t GetWBack(void *buf, size_t size); + // write back buffer or NULL if none + char *m_wback; + + // the size of the buffer + size_t m_wbacksize; + + // the current position in the buffer + size_t m_wbackcur; + + friend class wxStreamBuffer; }; -class WXDLLEXPORT wxOutputStream: public wxStreamBase { - public: - wxOutputStream(); - virtual ~wxOutputStream(); +// ---------------------------------------------------------------------------- +// wxOutputStream: base for the output streams +// ---------------------------------------------------------------------------- - void PutC(char c); - virtual wxOutputStream& Write(const void *buffer, size_t size); - wxOutputStream& Write(wxInputStream& stream_in); +class WXDLLEXPORT wxOutputStream : public wxStreamBase +{ +public: + wxOutputStream(); + virtual ~wxOutputStream(); - virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart); - virtual off_t TellO() const; + void PutC(char c); + virtual wxOutputStream& Write(const void *buffer, size_t size); + wxOutputStream& Write(wxInputStream& stream_in); - virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; } + virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart); + virtual off_t TellO() const; - virtual void Sync(); + virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; } - wxOutputStream& operator<<(wxInputStream& out) { return Write(out); } -#if wxUSE_SERIAL - wxOutputStream& operator<<(wxObject& obj); -#endif - wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); } + virtual void Sync(); + + 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; }; +// ============================================================================ +// helper stream classes +// ============================================================================ + // --------------------------------------------------------------------------- // A stream for measuring streamed output // --------------------------------------------------------------------------- -class wxCountingOutputStream: public wxOutputStream { - public: - wxCountingOutputStream(); - - size_t GetSize() const; - bool Ok() const { return TRUE; } +class WXDLLEXPORT wxCountingOutputStream : public wxOutputStream +{ +public: + wxCountingOutputStream(); - protected: + size_t GetSize() const; + bool Ok() const { return TRUE; } - size_t OnSysWrite(const void *buffer, size_t size); - off_t OnSysSeek(off_t pos, wxSeekMode mode); - off_t OnSysTell() const; +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; - protected: - size_t m_currentPos; + 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(); } + 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; + + DECLARE_NO_COPY_CLASS(wxFilterInputStream) }; -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(); } - 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; + + DECLARE_NO_COPY_CLASS(wxFilterOutputStream) }; +// ============================================================================ +// buffered streams +// ============================================================================ + // --------------------------------------------------------------------------- -// 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 Peek(); - 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; - - 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(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; } + + // this constructs a dummy wxStreamBuffer, used by (and exists for) + // wxMemoryStreams only, don't use! + wxStreamBuffer(BufMode mode); + +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_fixed, + m_flushable; + +private: +// Cannot use +// DECLARE_NO_COPY_CLASS(wxStreamBuffer) +// because copy constructor is explicitly declared above; +// but no copy assignment operator is defined, so declare +// it private to prevent the compiler from defining it: + wxStreamBuffer& operator=(const wxStreamBuffer&); }; // --------------------------------------------------------------------------- -// wxBufferedStreams +// wxBufferedInputStream // --------------------------------------------------------------------------- -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); + + // Position functions + off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart); + off_t TellI() const; - char Peek(); - wxInputStream& Read(void *buffer, size_t size); - - // Position functions - 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; } - wxStreamBuffer *InputStreamBuffer() 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; +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: - wxStreamBuffer *m_i_streambuf; + wxStreamBuffer *m_i_streambuf; + + DECLARE_NO_COPY_CLASS(wxBufferedInputStream) }; -class wxBufferedOutputStream: public wxFilterOutputStream { - public: - wxBufferedOutputStream(wxOutputStream& stream); - ~wxBufferedOutputStream(); +// ---------------------------------------------------------------------------- +// 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); - wxOutputStream& Write(const void *buffer, size_t size); - - // Position functions - off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart); - off_t TellO() const; + // Position functions + off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart); + off_t TellO() const; - void Sync(); + void Sync(); - wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; } + size_t GetSize() const; - protected: - size_t OnSysWrite(const 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 SetOutputStreamBuffer(wxStreamBuffer *buffer); + wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; } - protected: - wxStreamBuffer *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; + + DECLARE_NO_COPY_CLASS(wxBufferedOutputStream) }; -#endif - // wxUSE_STREAMS +#endif // wxUSE_STREAMS + +#endif // _WX_WXSTREAM_H__ -#endif - // _WX_WXSTREAM_H__