/////////////////////////////////////////////////////////////////////////////
// Name: wx/stream.h
-// Purpose: "wxWindows stream" base classes
-// Author: Guilhem Lavaux
+// 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_FWD_BASE wxStreamBase;
+class WXDLLIMPEXP_FWD_BASE wxInputStream;
+class WXDLLIMPEXP_FWD_BASE wxOutputStream;
typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
-WXDLLEXPORT wxOutputStream& wxEndL(wxOutputStream& o_stream);
+WXDLLIMPEXP_BASE wxOutputStream& wxEndL(wxOutputStream& o_stream);
-// ---------------------------------------------------------------------------
-// wxStream: base classes
-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
enum wxStreamError
{
- wxSTREAM_NO_ERROR = 0,
- wxSTREAM_NO_ERR = wxSTREAM_NO_ERROR,
- wxSTREAM_NOERROR = wxSTREAM_NO_ERROR,
+ 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_EOF,
+const int wxEOF = -1;
- wxSTREAM_WRITE_ERROR,
- wxSTREAM_WRITE_ERR = wxSTREAM_WRITE_ERROR,
+// ============================================================================
+// base stream classes: wxInputStream and wxOutputStream
+// ============================================================================
- wxSTREAM_READ_ERROR,
- wxSTREAM_READ_ERR = wxSTREAM_READ_ERROR
-};
-
-// 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
+// ---------------------------------------------------------------------------
+// wxStreamBase: common (but non virtual!) base for all stream classes
+// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxStreamBase
+class WXDLLIMPEXP_BASE wxStreamBase : public wxObject
{
public:
wxStreamBase();
virtual ~wxStreamBase();
// error testing
- wxStreamError LastError() const { return m_lasterror; }
wxStreamError GetLastError() const { return m_lasterror; }
- bool IsOk() const { return LastError() == wxSTREAM_NOERROR; }
- bool operator!() const { return LastError() != wxSTREAM_NOERROR; }
+ virtual bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; }
+ bool operator!() const { return !IsOk(); }
- virtual size_t GetSize() const { return ~((size_t)0); }
- size_t StreamSize() const { return GetSize(); }
+ // reset the stream state
+ void Reset(wxStreamError error = wxSTREAM_NO_ERROR) { m_lasterror = error; }
-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;
+ // this doesn't make sense for all streams, always test its return value
+ virtual size_t GetSize() const;
+ virtual wxFileOffset GetLength() const { return wxInvalidOffset; }
- friend class wxStreamBuffer;
+ // 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);
};
-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();
- // is the stream at EOF?
- virtual bool Eof() const;
// 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();
- char GetC();
+
+ // 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);
- wxInputStream& Read(wxOutputStream& stream_out);
- // Position functions
- virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
- virtual off_t TellI() const;
+ // Read exactly the given number of bytes, unlike Read(), which may read
+ // less than the requested amount of data without returning an error, this
+ // method either reads all the data or returns false.
+ bool ReadAll(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; }
- // 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(void *buf, size_t bsize);
+ friend class wxStreamBuffer;
+
+ DECLARE_ABSTRACT_CLASS(wxInputStream)
+ wxDECLARE_NO_COPY_CLASS(wxInputStream);
};
-class WXDLLEXPORT wxOutputStream: public wxStreamBase
+// ----------------------------------------------------------------------------
+// wxOutputStream: base for the output streams
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxOutputStream : public wxStreamBase
{
public:
wxOutputStream();
void PutC(char c);
virtual wxOutputStream& Write(const void *buffer, size_t size);
+
+ // This is ReadAll() equivalent for Write(): it either writes exactly the
+ // given number of bytes or returns false, unlike Write() which can write
+ // less data than requested but still return without error.
+ bool WriteAll(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_ABSTRACT_CLASS(wxOutputStream)
+ wxDECLARE_NO_COPY_CLASS(wxOutputStream);
};
+// ============================================================================
+// helper stream classes
+// ============================================================================
+
// ---------------------------------------------------------------------------
// A stream for measuring streamed output
// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxCountingOutputStream: public wxOutputStream
+class WXDLLIMPEXP_BASE wxCountingOutputStream : public wxOutputStream
{
public:
wxCountingOutputStream();
- size_t GetSize() const;
- bool Ok() const { return TRUE; }
+ virtual wxFileOffset GetLength() const;
+ bool Ok() const { return IsOk(); }
+ virtual bool IsOk() 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;
+ size_t m_currentPos,
+ m_lastPos;
+
+ DECLARE_DYNAMIC_CLASS(wxCountingOutputStream)
+ wxDECLARE_NO_COPY_CLASS(wxCountingOutputStream);
};
// ---------------------------------------------------------------------------
// "Filter" streams
// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxFilterInputStream: public wxInputStream
+class WXDLLIMPEXP_BASE wxFilterInputStream : public wxInputStream
{
public:
wxFilterInputStream();
wxFilterInputStream(wxInputStream& stream);
- ~wxFilterInputStream();
+ wxFilterInputStream(wxInputStream *stream);
+ 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;
+ bool m_owns;
+
+ DECLARE_ABSTRACT_CLASS(wxFilterInputStream)
+ wxDECLARE_NO_COPY_CLASS(wxFilterInputStream);
};
-class WXDLLEXPORT wxFilterOutputStream: public wxOutputStream
+class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream
{
public:
wxFilterOutputStream();
wxFilterOutputStream(wxOutputStream& stream);
- ~wxFilterOutputStream();
+ wxFilterOutputStream(wxOutputStream *stream);
+ 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; }
+
+ bool Close();
protected:
wxOutputStream *m_parent_o_stream;
+ bool m_owns;
+
+ DECLARE_ABSTRACT_CLASS(wxFilterOutputStream)
+ wxDECLARE_NO_COPY_CLASS(wxFilterOutputStream);
+};
+
+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)
+};
+
+// ============================================================================
+// 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:
enum BufMode
read_write
};
- wxStreamBuffer(wxStreamBase& stream, BufMode mode);
- wxStreamBuffer(BufMode mode);
+ 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);
- ~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 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);
+ // 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 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; }
// misc accessors
wxStreamBase *GetStream() const { return m_stream; }
- bool HasBuffer() const { return m_buffer_size != 0; }
+ 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
- wxStreamBase *Stream() { return m_stream; }
+ 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);
// 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();
*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;
// flags
bool m_destroybuf, // deallocate buffer?
- m_destroystream, // delete associated stream?
m_fixed,
m_flushable;
+
+
+ wxDECLARE_NO_ASSIGN_CLASS(wxStreamBuffer);
};
// ---------------------------------------------------------------------------
-// wxBufferedStreams
+// wxBufferedInputStream
// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxBufferedInputStream: public wxFilterInputStream
+class WXDLLIMPEXP_BASE wxBufferedInputStream : public wxFilterInputStream
{
public:
- wxBufferedInputStream(wxInputStream& stream);
- ~wxBufferedInputStream();
+ // 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
- 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(); }
- wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
+ // 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:
- 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;
+
+ wxDECLARE_NO_COPY_CLASS(wxBufferedInputStream);
};
-class WXDLLEXPORT wxBufferedOutputStream: public wxFilterOutputStream
+// ----------------------------------------------------------------------------
+// wxBufferedOutputStream
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxBufferedOutputStream : public wxFilterOutputStream
{
public:
- wxBufferedOutputStream(wxOutputStream& stream);
- ~wxBufferedOutputStream();
+ // 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
- 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;
+
+ wxDECLARE_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
+
+// ---------------------------------------------------------------------------
+// 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<wxWrapperInputStream*>(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__
+#endif // wxUSE_STREAMS
+
+#endif // _WX_WXSTREAM_H__
projects / wxWidgets.git / blobdiff