X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fcc6dddd1f1da49f94767ff148eaa3f1d3ca9367..ca77701441e39245dcbfce903049e76f166979e5:/include/wx/stream.h diff --git a/include/wx/stream.h b/include/wx/stream.h index e23ef48a58..80c81bcbdc 100644 --- a/include/wx/stream.h +++ b/include/wx/stream.h @@ -1,245 +1,693 @@ ///////////////////////////////////////////////////////////////////////////// -// 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: $Id$ // Copyright: (c) Guilhem Lavaux -// Licence: wxWindows license +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// #ifndef _WX_WXSTREAM_H__ #define _WX_WXSTREAM_H__ -#ifdef __GNUG__ -#pragma interface -#endif +#include "wx/defs.h" + +#if wxUSE_STREAMS #include #include "wx/object.h" #include "wx/string.h" -#include "wx/filefn.h" // for off_t, wxInvalidOffset and wxSeekMode +#include "wx/filefn.h" // for wxFileOffset, wxInvalidOffset and wxSeekMode -class WXDLLEXPORT wxInputStream; -class WXDLLEXPORT wxOutputStream; +class WXDLLIMPEXP_FWD_BASE wxStreamBase; +class WXDLLIMPEXP_FWD_BASE wxInputStream; +class WXDLLIMPEXP_FWD_BASE wxOutputStream; typedef wxInputStream& (*__wxInputManip)(wxInputStream&); typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&); -wxOutputStream& WXDLLEXPORT wxEndL(wxOutputStream& o_stream); +WXDLLIMPEXP_BASE 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 +}; + +const int wxEOF = -1; + +// ============================================================================ +// base stream classes: wxInputStream and wxOutputStream +// ============================================================================ + +// --------------------------------------------------------------------------- +// wxStreamBase: common (but non virtual!) base for all stream classes +// --------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE wxStreamBase : public wxObject +{ +public: + wxStreamBase(); + virtual ~wxStreamBase(); + + // error testing + wxStreamError GetLastError() const { return m_lasterror; } + virtual bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; } + bool operator!() const { return !IsOk(); } + + // reset the stream state + void Reset(wxStreamError error = wxSTREAM_NO_ERROR) { m_lasterror = error; } + + // this doesn't make sense for all streams, always test its return value + virtual size_t GetSize() const; + virtual wxFileOffset GetLength() const { return wxInvalidOffset; } + + // returns true if the streams supports seeking to arbitrary offsets + virtual bool IsSeekable() const { return false; } + +protected: + virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode); + virtual wxFileOffset OnSysTell() const; + + size_t m_lastcount; + wxStreamError m_lasterror; + + friend class wxStreamBuffer; + + DECLARE_ABSTRACT_CLASS(wxStreamBase) + wxDECLARE_NO_COPY_CLASS(wxStreamBase); +}; + +// ---------------------------------------------------------------------------- +// wxInputStream: base class for the input streams +// ---------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE 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 byte from the stream, blocking until it appears if + // necessary + // + // on success returns a value between 0 - 255, or wxEOF on EOF or error. + int GetC(); + + // 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); + + // copy the entire contents of this stream into streamOut, stopping only + // when EOF is reached or an error occurs + wxInputStream& Read(wxOutputStream& streamOut); + + + // status functions + // ---------------- + + // 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 wxFileOffset SeekI(wxFileOffset pos, wxSeekMode mode = wxFromStart); + + // return the current position of the stream pointer or wxInvalidOffset + virtual wxFileOffset TellI() const; + + + // stream-like operators + // --------------------- + + 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 occurred + // (m_lasterror should be set accordingly as well) or the number of bytes + // read + virtual size_t OnSysRead(void *buffer, size_t size) = 0; + + // 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; + + DECLARE_ABSTRACT_CLASS(wxInputStream) + wxDECLARE_NO_COPY_CLASS(wxInputStream); +}; + +// ---------------------------------------------------------------------------- +// wxOutputStream: base for the output streams +// ---------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE wxOutputStream : public wxStreamBase +{ +public: + wxOutputStream(); + virtual ~wxOutputStream(); + + void PutC(char c); + virtual wxOutputStream& Write(const void *buffer, size_t size); + wxOutputStream& Write(wxInputStream& stream_in); + + virtual wxFileOffset SeekO(wxFileOffset pos, wxSeekMode mode = wxFromStart); + virtual wxFileOffset TellO() const; + + virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; } + + virtual void Sync(); + virtual bool Close() { return true; } + + 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; + + DECLARE_ABSTRACT_CLASS(wxOutputStream) + wxDECLARE_NO_COPY_CLASS(wxOutputStream); +}; + +// ============================================================================ +// helper stream classes +// ============================================================================ // --------------------------------------------------------------------------- -// Stream buffer +// A stream for measuring streamed output // --------------------------------------------------------------------------- -class WXDLLEXPORT wxStreamBuffer { - public: - wxStreamBuffer(wxInputStream& stream); - wxStreamBuffer(wxOutputStream& stream); - ~wxStreamBuffer(); - - void Read(void *buffer, size_t size); - void Write(const void *buffer, size_t size); - void WriteBack(char c); - - void SetBufferIO(char *buffer_start, char *buffer_end); - void SetBufferIO(size_t bufsize); - void ResetBuffer(); - - void SetBufferPosition(char *buffer_position) - { m_buffer_pos = buffer_position; } - void SetIntPosition(size_t pos) - { m_buffer_pos = m_buffer_start + pos; } - char *GetBufferPosition() const { return m_buffer_pos; } - size_t GetIntPosition() const { return m_buffer_pos - m_buffer_start; } - - char *GetBufferStart() const { return m_buffer_start; } - char *GetBufferEnd() const { return m_buffer_end; } - size_t GetBufferSize() const { return m_buffer_size; } - size_t GetLastAccess() const { return m_buffer_end - m_buffer_start; } - - protected: - char *m_buffer_start, *m_buffer_end, *m_buffer_pos; - size_t m_buffer_size; - - wxInputStream *m_istream; - wxOutputStream *m_ostream; +class WXDLLIMPEXP_BASE wxCountingOutputStream : public wxOutputStream +{ +public: + wxCountingOutputStream(); + + wxFileOffset GetLength() const; + bool Ok() const { return IsOk(); } + bool IsOk() const { return true; } + +protected: + virtual size_t OnSysWrite(const void *buffer, size_t size); + virtual wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode); + virtual wxFileOffset OnSysTell() const; + + size_t m_currentPos; + + DECLARE_DYNAMIC_CLASS(wxCountingOutputStream) + wxDECLARE_NO_COPY_CLASS(wxCountingOutputStream); }; // --------------------------------------------------------------------------- -// wxStream: base classes +// "Filter" streams // --------------------------------------------------------------------------- -class WXDLLEXPORT wxInputStream { - public: - wxInputStream(); - virtual ~wxInputStream(); - - // IO functions - virtual char Peek() { return 0; } - virtual 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; - - // State functions - bool Eof() const { return m_eof; } - size_t LastRead() { return m_lastread; } - wxStreamBuffer *InputStreamBuffer() { return m_i_streambuf; } - - // Operators - wxInputStream& operator>>(wxOutputStream& out) { return Read(out); } - wxInputStream& operator>>(wxString& line); - wxInputStream& operator>>(char& c); - wxInputStream& operator>>(short& i); - wxInputStream& operator>>(int& i); - wxInputStream& operator>>(long& i); - wxInputStream& operator>>(float& i); -#if USE_SERIAL - wxInputStream& operator>>(wxObject *& obj); -#endif - - wxInputStream& operator>>(unsigned char& c) { return operator>>((char&)c); } - wxInputStream& operator>>(unsigned short& i) { return operator>>((short&)i); } - wxInputStream& operator>>(unsigned int& i) { return operator>>((int&)i); } - wxInputStream& operator>>(unsigned long& i) { return operator>>((long&)i); } - wxInputStream& operator>>( __wxInputManip func) { return func(*this); } - - protected: - friend class wxStreamBuffer; - friend class wxFilterInputStream; - - wxInputStream(wxStreamBuffer *buffer); - - virtual size_t DoRead(void *buffer, size_t size) { return 0; } - virtual off_t DoSeekInput(off_t pos, wxSeekMode mode) - { return wxInvalidOffset; } - virtual off_t DoTellInput() const - { return wxInvalidOffset; } - - protected: - bool m_eof, m_i_destroybuf; - size_t m_lastread; - wxStreamBuffer *m_i_streambuf; +class WXDLLIMPEXP_BASE wxFilterInputStream : public wxInputStream +{ +public: + wxFilterInputStream(); + wxFilterInputStream(wxInputStream& stream); + wxFilterInputStream(wxInputStream *stream); + virtual ~wxFilterInputStream(); + + char Peek() { return m_parent_i_stream->Peek(); } + + wxFileOffset GetLength() const { return m_parent_i_stream->GetLength(); } + + wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; } + +protected: + wxInputStream *m_parent_i_stream; + bool m_owns; + + DECLARE_ABSTRACT_CLASS(wxFilterInputStream) + wxDECLARE_NO_COPY_CLASS(wxFilterInputStream); +}; + +class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream +{ +public: + wxFilterOutputStream(); + wxFilterOutputStream(wxOutputStream& stream); + wxFilterOutputStream(wxOutputStream *stream); + virtual ~wxFilterOutputStream(); + + wxFileOffset GetLength() const { return m_parent_o_stream->GetLength(); } + + wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; } + + bool Close(); + +protected: + wxOutputStream *m_parent_o_stream; + bool m_owns; + + DECLARE_ABSTRACT_CLASS(wxFilterOutputStream) + wxDECLARE_NO_COPY_CLASS(wxFilterOutputStream); }; -class WXDLLEXPORT wxOutputStream { - public: - wxOutputStream(); - virtual ~wxOutputStream(); - - 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 bool Bad() const { return m_bad; } - virtual size_t LastWrite() const { return m_lastwrite; } - wxStreamBuffer *OutputStreamBuffer() { return m_o_streambuf; } - - virtual void Sync(); - - wxOutputStream& operator<<(wxInputStream& out) { return Write(out); } - wxOutputStream& operator<<(const char *string); - wxOutputStream& operator<<(wxString& string); - wxOutputStream& operator<<(char c); - wxOutputStream& operator<<(short i); - wxOutputStream& operator<<(int i); - wxOutputStream& operator<<(long i); - wxOutputStream& operator<<(double f); -#if USE_SERIAL - wxOutputStream& operator<<(wxObject& obj); -#endif - - wxOutputStream& operator<<(float f) { return operator<<((double)f); } - wxOutputStream& operator<<(unsigned char c) { return operator<<((char)c); } - wxOutputStream& operator<<(unsigned short i) { return operator<<((short)i); } - wxOutputStream& operator<<(unsigned int i) { return operator<<((int)i); } - wxOutputStream& operator<<(unsigned long i) { return operator<<((long)i); } - wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); } - - protected: - friend class wxStreamBuffer; - friend class wxFilterOutputStream; - - wxOutputStream(wxStreamBuffer *buffer); - - virtual size_t DoWrite(const void *buffer, size_t size) { return 0; } - virtual off_t DoSeekOutput(off_t pos, wxSeekMode mode) - { return wxInvalidOffset; } - virtual off_t DoTellOutput() const - { return wxInvalidOffset; } - - protected: - bool m_bad, m_o_destroybuf; - size_t m_lastwrite; - wxStreamBuffer *m_o_streambuf; +enum wxStreamProtocolType +{ + wxSTREAM_PROTOCOL, // wxFileSystem protocol (should be only one) + wxSTREAM_MIMETYPE, // MIME types the stream handles + wxSTREAM_ENCODING, // The HTTP Content-Encodings the stream handles + wxSTREAM_FILEEXT // File extensions the stream handles +}; + +void WXDLLIMPEXP_BASE wxUseFilterClasses(); + +class WXDLLIMPEXP_BASE wxFilterClassFactoryBase : public wxObject +{ +public: + virtual ~wxFilterClassFactoryBase() { } + + wxString GetProtocol() const { return wxString(*GetProtocols()); } + wxString PopExtension(const wxString& location) const; + + virtual const wxChar * const *GetProtocols(wxStreamProtocolType type + = wxSTREAM_PROTOCOL) const = 0; + + bool CanHandle(const wxString& protocol, + wxStreamProtocolType type + = wxSTREAM_PROTOCOL) const; + +protected: + wxString::size_type FindExtension(const wxString& location) const; + + DECLARE_ABSTRACT_CLASS(wxFilterClassFactoryBase) +}; + +class WXDLLIMPEXP_BASE wxFilterClassFactory : public wxFilterClassFactoryBase +{ +public: + virtual ~wxFilterClassFactory() { } + + virtual wxFilterInputStream *NewStream(wxInputStream& stream) const = 0; + virtual wxFilterOutputStream *NewStream(wxOutputStream& stream) const = 0; + virtual wxFilterInputStream *NewStream(wxInputStream *stream) const = 0; + virtual wxFilterOutputStream *NewStream(wxOutputStream *stream) const = 0; + + static const wxFilterClassFactory *Find(const wxString& protocol, + wxStreamProtocolType type + = wxSTREAM_PROTOCOL); + + static const wxFilterClassFactory *GetFirst(); + const wxFilterClassFactory *GetNext() const { return m_next; } + + void PushFront() { Remove(); m_next = sm_first; sm_first = this; } + void Remove(); + +protected: + wxFilterClassFactory() : m_next(this) { } + + wxFilterClassFactory& operator=(const wxFilterClassFactory&) + { return *this; } + +private: + static wxFilterClassFactory *sm_first; + wxFilterClassFactory *m_next; + + DECLARE_ABSTRACT_CLASS(wxFilterClassFactory) }; -class wxStream: virtual public wxInputStream, - virtual public wxOutputStream +// ============================================================================ +// buffered streams +// ============================================================================ + +// --------------------------------------------------------------------------- +// Stream buffer: this class can be derived from and passed to +// wxBufferedStreams to implement custom buffering +// --------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE wxStreamBuffer { - public: - wxStream(); +public: + enum BufMode + { + read, + write, + read_write + }; + + wxStreamBuffer(wxStreamBase& stream, BufMode mode) + { + InitWithStream(stream, mode); + } + + wxStreamBuffer(size_t bufsize, wxInputStream& stream) + { + InitWithStream(stream, read); + SetBufferIO(bufsize); + } + + wxStreamBuffer(size_t bufsize, wxOutputStream& stream) + { + InitWithStream(stream, write); + SetBufferIO(bufsize); + } + + 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 wxFileOffset Tell() const; + virtual wxFileOffset Seek(wxFileOffset pos, wxSeekMode mode); + + // Buffer control + void ResetBuffer(); + void Truncate(); + + // 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_end - m_buffer_start; } + 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_start != m_buffer_end; } + + 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; + +#if WXWIN_COMPATIBILITY_2_6 + // deprecated, for compatibility only + wxDEPRECATED( wxStreamBase *Stream() ); +#endif // WXWIN_COMPATIBILITY_2_6 + + // 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(); + + // common part of ctors taking wxStreamBase parameter + void InitWithStream(wxStreamBase& stream, BufMode mode); + + // 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 stream we're associated with + wxStreamBase *m_stream; + + // its mode + BufMode m_mode; + + // flags + bool m_destroybuf, // deallocate buffer? + m_fixed, + m_flushable; + + + wxDECLARE_NO_ASSIGN_CLASS(wxStreamBuffer); }; // --------------------------------------------------------------------------- -// "Filter" streams +// wxBufferedInputStream // --------------------------------------------------------------------------- -class WXDLLEXPORT wxFilterInputStream: virtual public wxInputStream { - public: - wxFilterInputStream(); - wxFilterInputStream(wxInputStream& stream); - ~wxFilterInputStream(); +class WXDLLIMPEXP_BASE wxBufferedInputStream : public wxFilterInputStream +{ +public: + // create a buffered stream on top of the specified low-level stream + // + // if a non NULL buffer is given to the stream, it will be deleted by it, + // otherwise a default 1KB buffer will be used + wxBufferedInputStream(wxInputStream& stream, + wxStreamBuffer *buffer = NULL); + + // ctor allowing to specify the buffer size, it's just a more convenient + // alternative to creating wxStreamBuffer, calling its SetBufferIO(bufsize) + // and using the ctor above + wxBufferedInputStream(wxInputStream& stream, size_t bufsize); + + + virtual ~wxBufferedInputStream(); + + char Peek(); + wxInputStream& Read(void *buffer, size_t size); + + // Position functions + wxFileOffset SeekI(wxFileOffset pos, wxSeekMode mode = wxFromStart); + wxFileOffset TellI() const; + bool IsSeekable() const { return m_parent_i_stream->IsSeekable(); } + + // the buffer given to the stream will be deleted by it + void SetInputStreamBuffer(wxStreamBuffer *buffer); + wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; } - char Peek() { return m_parent_i_stream->Peek(); } +#if WXWIN_COMPATIBILITY_2_6 + // deprecated, for compatibility only + wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const ); +#endif // WXWIN_COMPATIBILITY_2_6 - bool Eof() const { return m_parent_i_stream->Eof(); } - size_t LastRead() const { return m_parent_i_stream->LastRead(); } - off_t TellI() const { return m_parent_i_stream->TellI(); } +protected: + virtual size_t OnSysRead(void *buffer, size_t bufsize); + virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode); + virtual wxFileOffset OnSysTell() const; - protected: - size_t DoRead(void *buffer, size_t size); - off_t DoSeekInput(off_t pos, wxSeekMode mode); - off_t DoTellInput() const; + wxStreamBuffer *m_i_streambuf; - protected: - wxInputStream *m_parent_i_stream; + wxDECLARE_NO_COPY_CLASS(wxBufferedInputStream); }; -class WXDLLEXPORT wxFilterOutputStream: virtual public wxOutputStream { - public: - wxFilterOutputStream(); - wxFilterOutputStream(wxOutputStream& stream); - virtual ~wxFilterOutputStream(); +// ---------------------------------------------------------------------------- +// wxBufferedOutputStream +// ---------------------------------------------------------------------------- - bool Bad() const { return m_parent_o_stream->Bad(); } - size_t LastWrite() const { return m_parent_o_stream->LastWrite(); } - off_t TellO() const { return m_parent_o_stream->TellO(); } +class WXDLLIMPEXP_BASE wxBufferedOutputStream : public wxFilterOutputStream +{ +public: + // create a buffered stream on top of the specified low-level stream + // + // if a non NULL buffer is given to the stream, it will be deleted by it, + // otherwise a default 1KB buffer will be used + wxBufferedOutputStream(wxOutputStream& stream, + wxStreamBuffer *buffer = NULL); + + // ctor allowing to specify the buffer size, it's just a more convenient + // alternative to creating wxStreamBuffer, calling its SetBufferIO(bufsize) + // and using the ctor above + wxBufferedOutputStream(wxOutputStream& stream, size_t bufsize); + + virtual ~wxBufferedOutputStream(); + + wxOutputStream& Write(const void *buffer, size_t size); + + // Position functions + wxFileOffset SeekO(wxFileOffset pos, wxSeekMode mode = wxFromStart); + wxFileOffset TellO() const; + bool IsSeekable() const { return m_parent_o_stream->IsSeekable(); } + + void Sync(); + bool Close(); + + wxFileOffset GetLength() const; + + // the buffer given to the stream will be deleted by it + void SetOutputStreamBuffer(wxStreamBuffer *buffer); + wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; } - protected: - // The forward is implicitely done by wxStreamBuffer. +#if WXWIN_COMPATIBILITY_2_6 + // deprecated, for compatibility only + wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const ); +#endif // WXWIN_COMPATIBILITY_2_6 - size_t DoWrite(const void *buffer, size_t size); - off_t DoSeekOutput(off_t pos, wxSeekMode mode); - off_t DoTellOutput() const; +protected: + virtual size_t OnSysWrite(const void *buffer, size_t bufsize); + virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode); + virtual wxFileOffset OnSysTell() const; - protected: - wxOutputStream *m_parent_o_stream; + wxStreamBuffer *m_o_streambuf; + + wxDECLARE_NO_COPY_CLASS(wxBufferedOutputStream); }; -class WXDLLEXPORT wxFilterStream: public wxStream, - virtual public wxFilterInputStream, - virtual public wxFilterOutputStream { - public: - wxFilterStream(wxStream& stream); - wxFilterStream(); +#if WXWIN_COMPATIBILITY_2_6 + inline wxStreamBase *wxStreamBuffer::Stream() { return m_stream; } + inline wxStreamBuffer *wxBufferedInputStream::InputStreamBuffer() const { return m_i_streambuf; } + inline wxStreamBuffer *wxBufferedOutputStream::OutputStreamBuffer() const { return m_o_streambuf; } +#endif // WXWIN_COMPATIBILITY_2_6 + +// --------------------------------------------------------------------------- +// wxWrapperInputStream: forwards all IO to another stream. +// --------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE wxWrapperInputStream : public wxFilterInputStream +{ +public: + // Constructor fully initializing the stream. The overload taking pointer + // takes ownership of the parent stream, the one taking reference does not. + // + // Notice that this class also has a default ctor but it's protected as the + // derived class is supposed to take care of calling InitParentStream() if + // it's used. + wxWrapperInputStream(wxInputStream& stream); + wxWrapperInputStream(wxInputStream* stream); + + // Override the base class methods to forward to the wrapped stream. + virtual wxFileOffset GetLength() const; + virtual bool IsSeekable() const; + +protected: + virtual size_t OnSysRead(void *buffer, size_t size); + virtual wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode); + virtual wxFileOffset OnSysTell() const; + + // Ensure that our own last error is the same as that of the real stream. + // + // This method is const because the error must be updated even from const + // methods (in other words, it really should have been mutable in the first + // place). + void SynchronizeLastError() const + { + const_cast(this)-> + Reset(m_parent_i_stream->GetLastError()); + } + + // Default constructor, use InitParentStream() later. + wxWrapperInputStream(); + + // Set up the wrapped stream for an object initialized using the default + // constructor. The ownership logic is the same as above. + void InitParentStream(wxInputStream& stream); + void InitParentStream(wxInputStream* stream); + + wxDECLARE_NO_COPY_CLASS(wxWrapperInputStream); }; -#endif + +#endif // wxUSE_STREAMS + +#endif // _WX_WXSTREAM_H__