X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/90693f47f2893f681b0548fce4f4bdac0f1c6a81..ab67e8874db324fab5223cc8d5dff8a8de3e2b77:/include/wx/stream.h?ds=sidebyside diff --git a/include/wx/stream.h b/include/wx/stream.h index ed07ce61a8..80c81bcbdc 100644 --- a/include/wx/stream.h +++ b/include/wx/stream.h @@ -640,6 +640,54 @@ protected: 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 // wxUSE_STREAMS #endif // _WX_WXSTREAM_H__