/////////////////////////////////////////////////////////////////////////////
-// Name: stream.h
+// Name: wx/stream.h
// Purpose: "wxWindows stream" base classes
// Author: Guilhem Lavaux
// Modified by:
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
-#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 <stdio.h>
#include "wx/object.h"
#include "wx/string.h"
-#include "wx/filefn.h" // for off_t and wxSeekMode
+#include "wx/filefn.h" // for off_t, wxInvalidOffset and wxSeekMode
+
+class WXDLLEXPORT wxStreamBase;
+class WXDLLEXPORT wxInputStream;
+class WXDLLEXPORT wxOutputStream;
-/*
- * wxStream: base classes
- */
-class wxOutputStream;
-class wxInputStream: virtual public wxObject {
- DECLARE_ABSTRACT_CLASS(wxInputStream)
- public:
- wxInputStream();
- virtual ~wxInputStream();
+typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
+typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
- virtual wxInputStream& Read(void *buffer, size_t size) = 0;
- wxInputStream& Read(wxOutputStream& stream_out);
+WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream);
- virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart) = 0;
- virtual off_t TellI() const = 0;
+// ---------------------------------------------------------------------------
+// wxStream: base classes
+// ---------------------------------------------------------------------------
- virtual bool Eof() const = 0;
- virtual size_t LastRead() const = 0;
+enum wxStreamError
+{
+ wxSTREAM_NO_ERROR = 0,
+ wxSTREAM_NO_ERR = wxSTREAM_NO_ERROR,
+ wxSTREAM_NOERROR = wxSTREAM_NO_ERROR,
- wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
+ wxSTREAM_EOF,
+
+ wxSTREAM_WRITE_ERROR,
+ wxSTREAM_WRITE_ERR = wxSTREAM_WRITE_ERROR,
+
+ wxSTREAM_READ_ERROR,
+ wxSTREAM_READ_ERR = wxSTREAM_READ_ERROR
};
-class wxOutputStream: virtual public wxObject {
- DECLARE_ABSTRACT_CLASS(wxOutputStream)
- public:
- wxOutputStream();
- virtual ~wxOutputStream();
+// 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
+
+class WXDLLEXPORT wxStreamBase
+{
+public:
+ wxStreamBase();
+ virtual ~wxStreamBase();
- virtual wxOutputStream& Write(const void *buffer, size_t size) = 0;
- wxOutputStream& Write(wxInputStream& stream_in);
+ // error testing
+ wxStreamError GetLastError() const { return m_lasterror; }
+ bool IsOk() const { return LastError() == wxSTREAM_NOERROR; }
+ bool operator!() const { return LastError() != wxSTREAM_NOERROR; }
- virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart) = 0;
- virtual off_t TellO() const = 0;
+ virtual size_t GetSize() const { return 0; }
- virtual bool Bad() const = 0;
- virtual size_t LastWrite() const = 0;
+ // deprecated, for compatibility only
+ wxStreamError LastError() const { return m_lasterror; }
+ size_t StreamSize() const { return GetSize(); }
- virtual void Sync() {}
+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;
};
-/*
- * "Filter" streams
- */
+class WXDLLEXPORT wxInputStream : /* virtual */ public wxStreamBase
+{
+public:
+ wxInputStream();
+ virtual ~wxInputStream();
+
+ // is the stream at EOF?
+ virtual bool Eof() const;
-class wxFilterInputStream: public wxInputStream {
- DECLARE_CLASS(wxFilterInputStream)
- public:
- wxFilterInputStream(wxInputStream& stream);
- virtual ~wxFilterInputStream();
+ // IO functions
+ virtual char Peek();
+ char GetC();
+ virtual wxInputStream& Read(void *buffer, size_t size);
+ wxInputStream& Read(wxOutputStream& stream_out);
- 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(); }
+ // Position functions
+ virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
+ virtual off_t TellI() const;
- virtual bool Eof() const { return m_parent_i_stream->Eof(); }
- virtual size_t LastRead() const { return m_parent_i_stream->LastRead(); }
+ // State functions
+ virtual size_t LastRead() { return wxStreamBase::m_lastcount; }
- protected:
- wxInputStream *m_parent_i_stream;
+ // 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);
+
+ // Ungetch managers
+ char *m_wback;
+ size_t m_wbacksize;
+ size_t m_wbackcur;
+
+ char *AllocSpaceWBack(size_t needed_size);
+ size_t GetWBack(void *buf, size_t bsize);
+
+ friend class wxStreamBuffer;
};
-class wxFilterOutputStream: public wxOutputStream {
- DECLARE_CLASS(wxFilterOutputStream)
- public:
- wxFilterOutputStream(wxOutputStream& stream);
- virtual ~wxFilterOutputStream();
+class WXDLLEXPORT wxOutputStream : /* virtual */ public wxStreamBase
+{
+public:
+ wxOutputStream();
+ virtual ~wxOutputStream();
- 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(); }
+ void PutC(char c);
+ virtual wxOutputStream& Write(const void *buffer, size_t size);
+ wxOutputStream& Write(wxInputStream& stream_in);
- virtual bool Bad() const { return m_parent_o_stream->Bad(); }
- virtual size_t LastWrite() const { return m_parent_o_stream->LastWrite(); }
+ virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
+ virtual off_t TellO() const;
- protected:
- wxOutputStream *m_parent_o_stream;
+ virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; }
+
+ 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;
};
-#endif
+// ---------------------------------------------------------------------------
+// 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);
+ virtual ~wxFilterInputStream();
+
+ char Peek() { return m_parent_i_stream->Peek(); }
+
+ size_t GetSize() const { return m_parent_i_stream->GetSize(); }
+
+ wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; }
+
+protected:
+ wxInputStream *m_parent_i_stream;
+};
+
+class WXDLLEXPORT wxFilterOutputStream : public wxOutputStream
+{
+public:
+ wxFilterOutputStream();
+ wxFilterOutputStream(wxOutputStream& stream);
+ virtual ~wxFilterOutputStream();
+
+ size_t GetSize() const { return m_parent_o_stream->GetSize(); }
+
+ wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; }
+
+protected:
+ wxOutputStream *m_parent_o_stream;
+};
+
+// ---------------------------------------------------------------------------
+// Stream buffer: this class can be derived from and passed to
+// wxBufferedStreams to implement custom buffering
+// ---------------------------------------------------------------------------
+
+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 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;
+
+ // the buffer given to the stream will be deleted by it
+ void SetInputStreamBuffer(wxStreamBuffer *buffer);
+ wxStreamBuffer *GetInputStreamBuffer() const { return 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 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;
+
+ void Sync();
+
+ size_t GetSize() const;
+
+ // the buffer given to the stream will be deleted by it
+ void SetOutputStreamBuffer(wxStreamBuffer *buffer);
+ wxStreamBuffer *GetOutputStreamBuffer() const { return 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;
+};
+
+#endif // wxUSE_STREAMS
+
+#endif // _WX_WXSTREAM_H__
+
projects / wxWidgets.git / blobdiff