X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e49f47aa77457548df1a86f74c285ea3226b3cce..f46ad98f0df1e1b073a484cb34a91e2e1278fdb7:/include/wx/stream.h diff --git a/include/wx/stream.h b/include/wx/stream.h index c56b8c6171..ca3b84eb57 100644 --- a/include/wx/stream.h +++ b/include/wx/stream.h @@ -1,104 +1,536 @@ ///////////////////////////////////////////////////////////////////////////// -// 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 __WXSTREAM_H__ -#define __WXSTREAM_H__ +#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 and wxSeekMode +#include "wx/filefn.h" // for wxFileOffset, wxInvalidOffset and wxSeekMode + +class WXDLLIMPEXP_BASE wxStreamBase; +class WXDLLIMPEXP_BASE wxInputStream; +class WXDLLIMPEXP_BASE wxOutputStream; + +typedef wxInputStream& (*__wxInputManip)(wxInputStream&); +typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&); + +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 +}; + +// ============================================================================ +// base stream classes: wxInputStream and wxOutputStream +// ============================================================================ + +// --------------------------------------------------------------------------- +// wxStreamBase: common (but non virtual!) base for all stream classes +// --------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE 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; } + + // 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_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 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(); + + // 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_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; -/* - * wxStream: base classes - */ -class wxOutputStream; -class wxInputStream { - public: - wxInputStream(); - virtual ~wxInputStream(); + virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; } - virtual wxInputStream& Read(void *buffer, size_t size) = 0; - wxInputStream& Read(wxOutputStream& stream_out); + virtual void Sync(); + virtual bool Close() { return true; } - virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart) = 0; - virtual off_t TellI() const = 0; + wxOutputStream& operator<<(wxInputStream& out) { return Write(out); } + wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); } - virtual bool Eof() const = 0; - virtual size_t LastRead() const = 0; +protected: + // to be implemented in the derived classes (it should have been pure + // virtual) + virtual size_t OnSysWrite(const void *buffer, size_t bufsize); - wxInputStream& operator>>(wxOutputStream& out) { return Read(out); } + friend class wxStreamBuffer; + + DECLARE_NO_COPY_CLASS(wxOutputStream) }; -class wxOutputStream { - public: - wxOutputStream(); - virtual ~wxOutputStream(); +// ============================================================================ +// helper stream classes +// ============================================================================ + +// --------------------------------------------------------------------------- +// A stream for measuring streamed output +// --------------------------------------------------------------------------- - virtual wxOutputStream& Write(const void *buffer, size_t size) = 0; - wxOutputStream& Write(wxInputStream& stream_in); +class WXDLLIMPEXP_BASE wxCountingOutputStream : public wxOutputStream +{ +public: + wxCountingOutputStream(); - virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart) = 0; - virtual off_t TellO() const = 0; + wxFileOffset GetLength() const; + bool Ok() const { return true; } - virtual bool Bad() const = 0; - virtual size_t LastWrite() const = 0; +protected: + virtual size_t OnSysWrite(const void *buffer, size_t size); + virtual wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode); + virtual wxFileOffset OnSysTell() const; - virtual void Sync() {} + size_t m_currentPos; + + DECLARE_NO_COPY_CLASS(wxCountingOutputStream) }; -/* - * "Filter" streams - */ +// --------------------------------------------------------------------------- +// "Filter" streams +// --------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE wxFilterInputStream : public wxInputStream +{ +public: + wxFilterInputStream(); + wxFilterInputStream(wxInputStream& stream); + virtual ~wxFilterInputStream(); -class wxFilterInputStream: public wxInputStream { - public: - wxFilterInputStream(wxInputStream& stream); - virtual ~wxFilterInputStream(); + char Peek() { return m_parent_i_stream->Peek(); } - virtual wxInputStream& Read(void *buffer, size_t size) - { return m_parent_i_stream->Read(buffer, size); } - virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart) - { return m_parent_i_stream->SeekI(pos, mode); } - virtual off_t TellI() const - { return m_parent_i_stream->TellI(); } + wxFileOffset GetLength() const { return m_parent_i_stream->GetLength(); } - virtual bool Eof() const { return m_parent_i_stream->Eof(); } - virtual size_t LastRead() const { return m_parent_i_stream->LastRead(); } + wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; } - protected: - wxInputStream *m_parent_i_stream; +protected: + wxInputStream *m_parent_i_stream; + + DECLARE_NO_COPY_CLASS(wxFilterInputStream) }; -class wxFilterOutputStream: public wxOutputStream { - public: - wxFilterOutputStream(wxOutputStream& stream); - virtual ~wxFilterOutputStream(); +class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream +{ +public: + wxFilterOutputStream(); + wxFilterOutputStream(wxOutputStream& stream); + virtual ~wxFilterOutputStream(); + + wxFileOffset GetLength() const { return m_parent_o_stream->GetLength(); } - virtual wxOutputStream& Write(const void *buffer, size_t size) - { return m_parent_o_stream->Write(buffer, size); } - virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart) - { return m_parent_o_stream->SeekO(pos, mode); } - virtual off_t TellO() const - { return m_parent_o_stream->TellO(); } + wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; } - virtual bool Bad() const { return m_parent_o_stream->Bad(); } - virtual size_t LastWrite() const { return m_parent_o_stream->LastWrite(); } +protected: + wxOutputStream *m_parent_o_stream; - protected: - wxOutputStream *m_parent_o_stream; + DECLARE_NO_COPY_CLASS(wxFilterOutputStream) }; -#endif +// ============================================================================ +// buffered streams +// ============================================================================ + +// --------------------------------------------------------------------------- +// Stream buffer: this class can be derived from and passed to +// wxBufferedStreams to implement custom buffering +// --------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE 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 wxFileOffset Tell() const; + virtual wxFileOffset Seek(wxFileOffset 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; + +#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(); + + // 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&); +}; + +// --------------------------------------------------------------------------- +// wxBufferedInputStream +// --------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE 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 + 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; } + +#if WXWIN_COMPATIBILITY_2_6 + // deprecated, for compatibility only + wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const ); +#endif // WXWIN_COMPATIBILITY_2_6 + +protected: + virtual size_t OnSysRead(void *buffer, size_t bufsize); + virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode); + virtual wxFileOffset OnSysTell() const; + + wxStreamBuffer *m_i_streambuf; + + DECLARE_NO_COPY_CLASS(wxBufferedInputStream) +}; + +// ---------------------------------------------------------------------------- +// wxBufferedOutputStream +// ---------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE 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 + 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; } + +#if WXWIN_COMPATIBILITY_2_6 + // deprecated, for compatibility only + wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const ); +#endif // WXWIN_COMPATIBILITY_2_6 + +protected: + virtual size_t OnSysWrite(const void *buffer, size_t bufsize); + virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode); + virtual wxFileOffset OnSysTell() const; + + wxStreamBuffer *m_o_streambuf; + + DECLARE_NO_COPY_CLASS(wxBufferedOutputStream) +}; + +#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 + +#endif // wxUSE_STREAMS + +#endif // _WX_WXSTREAM_H__