/////////////////////////////////////////////////////////////////////////////
-// 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 <stdio.h>
#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 wxStreamBase;
-class WXDLLEXPORT wxInputStream;
-class WXDLLEXPORT wxOutputStream;
+class WXDLLIMPEXP_BASE wxStreamBase;
+class WXDLLIMPEXP_BASE wxInputStream;
+class WXDLLIMPEXP_BASE wxOutputStream;
typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
-WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream);
-
-// ---------------------------------------------------------------------------
-// wxStream: base 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_NO_ERROR = 0,
- wxSTREAM_NO_ERR = wxSTREAM_NO_ERROR,
- wxSTREAM_NOERROR = wxSTREAM_NO_ERROR,
+WXDLLIMPEXP_BASE wxOutputStream& wxEndL(wxOutputStream& o_stream);
- wxSTREAM_EOF,
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
- wxSTREAM_WRITE_ERROR,
- wxSTREAM_WRITE_ERR = wxSTREAM_WRITE_ERROR,
+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
+};
- wxSTREAM_READ_ERROR,
- wxSTREAM_READ_ERR = wxSTREAM_READ_ERROR
+// ============================================================================
+// base stream classes: wxInputStream and wxOutputStream
+// ============================================================================
-} wxStreamError;
+// ---------------------------------------------------------------------------
+// wxStreamBase: common (but non virtual!) base for all stream classes
+// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxStreamBase
+class WXDLLIMPEXP_BASE 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(); }
+ // error testing
+ wxStreamError GetLastError() const { return m_lasterror; }
+ bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; }
+ bool operator!() const { return !IsOk(); }
-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;
+ // reset the stream state
+ void Reset() { m_lasterror = wxSTREAM_NO_ERROR; }
- friend class wxStreamBuffer;
+ // 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)
};
-class WXDLLEXPORT wxInputStream: public 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);
- wxInputStream& Read(wxOutputStream& stream_out);
- // 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);
+
+
+ // 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; }
- // State functions
- virtual size_t LastRead() { 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;
- // Ungetch
+ // 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);
- // Operators
+
+ // 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); }
-#if wxUSE_SERIAL
- wxInputStream& operator>>(wxObject *& obj);
-#endif
- wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
+ wxInputStream& operator>>(__wxInputManip func) { return func(*this); }
protected:
- // Ungetch managers
+ // 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;
- char *AllocSpaceWBack(size_t needed_size);
- size_t GetWBack(char *buf, size_t bsize);
+ friend class wxStreamBuffer;
+
+ DECLARE_NO_COPY_CLASS(wxInputStream)
};
-class WXDLLEXPORT wxOutputStream: public wxStreamBase
+// ----------------------------------------------------------------------------
+// wxOutputStream: base for the output streams
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxOutputStream : public wxStreamBase
{
public:
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 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); }
-#if wxUSE_SERIAL
- wxOutputStream& operator<<(wxObject& obj);
-#endif
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_NO_COPY_CLASS(wxOutputStream)
};
+// ============================================================================
+// helper stream classes
+// ============================================================================
+
// ---------------------------------------------------------------------------
// A stream for measuring streamed output
// ---------------------------------------------------------------------------
-class wxCountingOutputStream: public wxOutputStream
+class WXDLLIMPEXP_BASE wxCountingOutputStream : public wxOutputStream
{
public:
wxCountingOutputStream();
- size_t GetSize() const;
- bool Ok() const { return TRUE; }
+ wxFileOffset GetLength() const;
+ bool Ok() const { return true; }
protected:
- size_t OnSysWrite(const void *buffer, size_t size);
- off_t OnSysSeek(off_t pos, wxSeekMode mode);
- off_t OnSysTell() const;
+ 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_NO_COPY_CLASS(wxCountingOutputStream)
+};
// ---------------------------------------------------------------------------
// "Filter" streams
// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxFilterInputStream: public wxInputStream
+class WXDLLIMPEXP_BASE wxFilterInputStream : public wxInputStream
{
public:
wxFilterInputStream();
wxFilterInputStream(wxInputStream& stream);
- ~wxFilterInputStream();
+ virtual ~wxFilterInputStream();
char Peek() { return m_parent_i_stream->Peek(); }
- size_t GetSize() const { return m_parent_i_stream->GetSize(); }
+ wxFileOffset GetLength() const { return m_parent_i_stream->GetLength(); }
+
+ wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; }
protected:
wxInputStream *m_parent_i_stream;
+
+ DECLARE_NO_COPY_CLASS(wxFilterInputStream)
};
-class WXDLLEXPORT wxFilterOutputStream: public wxOutputStream
+class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream
{
public:
wxFilterOutputStream();
wxFilterOutputStream(wxOutputStream& stream);
- ~wxFilterOutputStream();
+ virtual ~wxFilterOutputStream();
+
+ wxFileOffset GetLength() const { return m_parent_o_stream->GetLength(); }
- size_t GetSize() const { return m_parent_o_stream->GetSize(); }
+ wxOutputStream *GetFilterOutputStream() const { return 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
+class WXDLLIMPEXP_BASE wxStreamBuffer
{
public:
- typedef enum {
- read = 0, write, read_write
- } BufMode;
+ enum BufMode
+ {
+ read,
+ write,
+ read_write
+ };
wxStreamBuffer(wxStreamBase& stream, BufMode mode);
- wxStreamBuffer(BufMode mode);
wxStreamBuffer(const wxStreamBuffer& buf);
- ~wxStreamBuffer();
+ virtual ~wxStreamBuffer();
// Filtered IO
- size_t Read(void *buffer, size_t size);
+ virtual size_t Read(void *buffer, size_t size);
size_t Read(wxStreamBuffer *buf);
- size_t Write(const void *buffer, size_t size);
+ virtual 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);
+ 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 SetBufferIO(char *buffer_start, char *buffer_end);
+
+ // 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);
- 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 *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 FillBuffer();
size_t GetDataLeft();
- // Misc.
- wxStreamBase *Stream() { return m_stream; }
+ // 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);
- char *m_buffer_start, *m_buffer_end, *m_buffer_pos;
- size_t m_buffer_size;
+ // set the last error to the specified value if we didn't have it before
+ void SetError(wxStreamError err);
- bool m_fixed, m_flushable;
+ // 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;
- bool m_destroybuf, m_destroystream;
+
+ // 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
+class WXDLLIMPEXP_BASE wxBufferedInputStream : public wxFilterInputStream
{
public:
- wxBufferedInputStream(wxInputStream& stream);
- ~wxBufferedInputStream();
+ // 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;
+ 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; }
- wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
+#if WXWIN_COMPATIBILITY_2_6
+ // deprecated, for compatibility only
+ wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const );
+#endif // WXWIN_COMPATIBILITY_2_6
protected:
- size_t OnSysRead(void *buffer, size_t bufsize);
- off_t OnSysSeek(off_t seek, wxSeekMode mode);
- off_t OnSysTell() const;
+ 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)
};
-class wxBufferedOutputStream: public wxFilterOutputStream
+// ----------------------------------------------------------------------------
+// wxBufferedOutputStream
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxBufferedOutputStream : public wxFilterOutputStream
{
public:
- wxBufferedOutputStream(wxOutputStream& stream);
- ~wxBufferedOutputStream();
+ // 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;
+ 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;
- 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; }
- wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; }
+#if WXWIN_COMPATIBILITY_2_6
+ // deprecated, for compatibility only
+ wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const );
+#endif // WXWIN_COMPATIBILITY_2_6
protected:
- size_t OnSysWrite(const void *buffer, size_t bufsize);
- off_t OnSysSeek(off_t seek, wxSeekMode mode);
- off_t OnSysTell() const;
+ 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)
};
-#endif
- // wxUSE_STREAMS
+#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__
+#endif // _WX_WXSTREAM_H__
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