/////////////////////////////////////////////////////////////////////////////
-// 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: $Id$
#ifndef _WX_WXSTREAM_H__
#define _WX_WXSTREAM_H__
-#ifdef __GNUG__
-#pragma interface
+#if defined(__GNUG__) && !defined(__APPLE__)
+#pragma interface "stream.h"
#endif
+#include "wx/defs.h"
+
+#if wxUSE_STREAMS
+
#include <stdio.h>
#include "wx/object.h"
#include "wx/string.h"
typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
-wxOutputStream& WXDLLEXPORT wxEndL(wxOutputStream& o_stream);
+WXDLLEXPORT 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
+};
+
+// compatibility
+#if WXWIN_COMPATIBILITY_2_2
+ #define wxStream_NOERROR wxSTREAM_NOERROR
+ #define wxStream_EOF wxSTREAM_EOF
+ #define wxStream_WRITE_ERR wxSTREAM_WRITE_ERROR
+ #define wxStream_READ_ERR wxSTREAM_READ_ERROR
+
+ #define wxSTREAM_NO_ERR wxSTREAM_NO_ERROR
+ #define wxSTREAM_NOERROR wxSTREAM_NO_ERROR
+ #define wxSTREAM_WRITE_ERR wxSTREAM_WRITE_ERROR
+ #define wxSTREAM_READ_ERR wxSTREAM_READ_ERROR
+#endif // WXWIN_COMPATIBILITY_2_2
+
+// ============================================================================
+// base stream classes: wxInputStream and wxOutputStream
+// ============================================================================
// ---------------------------------------------------------------------------
-// Stream buffer
+// wxStreamBase: common (but non virtual!) base for all stream classes
// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxStreamBuffer {
- public:
- typedef enum {
- read, write
- } BufMode;
-
- // -----------
- // ctor & dtor
- // -----------
- wxStreamBuffer(wxStreamBase& stream, BufMode mode);
- ~wxStreamBuffer();
-
- // -----------
- // Filtered IO
- // -----------
- void Read(void *buffer, size_t size);
- void Write(const void *buffer, size_t size);
- bool WriteBack(const char *buffer, size_t size);
- bool WriteBack(char c);
- off_t Tell() const;
- off_t Seek(off_t pos, wxSeekMode mode);
-
- // --------------
- // Buffer control
- // --------------
- void ResetBuffer();
- void SetBufferIO(char *buffer_start, char *buffer_end);
- 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 Fixed(bool fixed) { m_fixed = fixed; }
-
- bool FlushBuffer();
- bool FillBuffer();
- size_t GetDataLeft() const;
-
- protected:
- char *AllocSpaceWBack(size_t needed_size);
- size_t GetWBack(char *buf, size_t bsize);
-
- void GetFromBuffer(void *buffer, size_t size);
- void PutToBuffer(const void *buffer, size_t size);
-
- protected:
- char *m_buffer_start, *m_buffer_end, *m_buffer_pos;
- size_t m_buffer_size;
-
- char *m_wback;
- size_t m_wbacksize, m_wbackcur;
-
- bool m_fixed;
-
- wxStreamBase *m_stream;
- BufMode m_mode;
+class WXDLLEXPORT 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; }
+
+ // deprecated (doesn't make sense!), don't use
+ virtual size_t GetSize() const { return 0; }
+
+#if WXWIN_COMPATIBILITY_2_2
+ // deprecated, for compatibility only
+ wxStreamError LastError() const { return m_lasterror; }
+ size_t StreamSize() const { return GetSize(); }
+#endif // WXWIN_COMPATIBILITY_2_2
+
+protected:
+ virtual off_t OnSysSeek(off_t seek, wxSeekMode mode);
+ virtual off_t 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 WXDLLEXPORT 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 off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
+
+ // return the current position of the stream pointer or wxInvalidOffset
+ virtual off_t 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 occured
+ // (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;
+};
+
+// ----------------------------------------------------------------------------
+// wxOutputStream: base for the output streams
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT 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 off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
+ virtual off_t TellO() const;
+
+ 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;
+};
+
+// ============================================================================
+// helper stream classes
+// ============================================================================
+
// ---------------------------------------------------------------------------
-// wxStream: base classes
+// A stream for measuring streamed output
// ---------------------------------------------------------------------------
-typedef enum {
- wxStream_NOERROR,
- wxStream_EOF
-} wxStreamError;
+class WXDLLEXPORT wxCountingOutputStream : public wxOutputStream
+{
+public:
+ wxCountingOutputStream();
-class WXDLLEXPORT wxStreamBase {
- public:
- wxStreamBase();
- virtual ~wxStreamBase();
+ size_t GetSize() const;
+ bool Ok() const { return TRUE; }
- wxStreamError LastError() { return m_lasterror; }
+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;
- protected:
- friend class wxStreamBuffer;
+ size_t m_currentPos;
+};
- 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();
+// ---------------------------------------------------------------------------
+// "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(); }
- protected:
- size_t m_lastcount;
- wxStreamError m_lasterror;
+ wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; }
+
+protected:
+ wxInputStream *m_parent_i_stream;
+
+ DECLARE_NO_COPY_CLASS(wxFilterInputStream)
};
-class WXDLLEXPORT wxInputStream: public wxStreamBase {
- public:
- wxInputStream();
- wxInputStream(wxStreamBuffer *sbuf);
- virtual ~wxInputStream();
-
- // IO functions
- virtual char Peek();
- char GetC();
- wxInputStream& Read(void *buffer, size_t size);
- wxInputStream& Read(wxOutputStream& stream_out);
-
- // Position functions
- off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
- off_t TellI() const;
-
- // State functions
- wxStreamBuffer *InputStreamBuffer() { return m_i_streambuf; }
- size_t LastRead() { return wxStreamBase::m_lastcount; }
-
- // Operators
- wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
- wxInputStream& operator>>(wxString& line);
- wxInputStream& operator>>(char& c);
- wxInputStream& operator>>(short& i);
- wxInputStream& operator>>(int& i);
- wxInputStream& operator>>(long& i);
- wxInputStream& operator>>(double& i);
-#if wxUSE_SERIAL
- wxInputStream& operator>>(wxObject *& obj);
-#endif
+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; }
- wxInputStream& operator>>(float& f) { double d; operator>>((double&)d); f = (float)d; return *this; }
- wxInputStream& operator>>(unsigned char& c) { return operator>>((char&)c); }
- wxInputStream& operator>>(unsigned short& i) { return operator>>((short&)i); }
- wxInputStream& operator>>(unsigned int& i) { return operator>>((int&)i); }
- wxInputStream& operator>>(unsigned long& i) { return operator>>((long&)i); }
- wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
+protected:
+ wxOutputStream *m_parent_o_stream;
- protected:
- bool m_i_destroybuf;
- wxStreamBuffer *m_i_streambuf;
+ DECLARE_NO_COPY_CLASS(wxFilterOutputStream)
};
-class WXDLLEXPORT wxOutputStream: public wxStreamBase {
- public:
- wxOutputStream();
- wxOutputStream(wxStreamBuffer *sbuf);
- virtual ~wxOutputStream();
-
- wxOutputStream& Write(const void *buffer, size_t size);
- wxOutputStream& Write(wxInputStream& stream_in);
-
- off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
- off_t TellO() const;
-
- size_t LastWrite() const { return wxStreamBase::m_lastcount; }
- wxStreamBuffer *OutputStreamBuffer() { return m_o_streambuf; }
-
- void Sync();
-
- wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
- wxOutputStream& operator<<(const char *string);
- wxOutputStream& operator<<(wxString& string);
- wxOutputStream& operator<<(char c);
- wxOutputStream& operator<<(short i);
- wxOutputStream& operator<<(int i);
- wxOutputStream& operator<<(long i);
- wxOutputStream& operator<<(double f);
-#if wxUSE_SERIAL
- wxOutputStream& operator<<(wxObject& obj);
-#endif
+// ============================================================================
+// buffered streams
+// ============================================================================
- wxOutputStream& operator<<(float f) { return operator<<((double)f); }
- wxOutputStream& operator<<(unsigned char c) { return operator<<((char)c); }
- wxOutputStream& operator<<(unsigned short i) { return operator<<((short)i); }
- wxOutputStream& operator<<(unsigned int i) { return operator<<((int)i); }
- wxOutputStream& operator<<(unsigned long i) { return operator<<((long)i); }
- wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); }
+// ---------------------------------------------------------------------------
+// Stream buffer: this class can be derived from and passed to
+// wxBufferedStreams to implement custom buffering
+// ---------------------------------------------------------------------------
- protected:
- bool m_o_destroybuf;
- wxStreamBuffer *m_o_streambuf;
+class WXDLLEXPORT 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 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; }
+
+ // 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&);
};
// ---------------------------------------------------------------------------
-// "Filter" streams
+// wxBufferedInputStream
// ---------------------------------------------------------------------------
-class WXDLLEXPORT wxFilterInputStream: public wxInputStream {
- public:
- wxFilterInputStream();
- wxFilterInputStream(wxInputStream& stream);
- ~wxFilterInputStream();
+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;
- char Peek() { return m_parent_i_stream->Peek(); }
+ // the buffer given to the stream will be deleted by it
+ void SetInputStreamBuffer(wxStreamBuffer *buffer);
+ wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
- protected:
- wxInputStream *m_parent_i_stream;
+ // 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;
+
+ DECLARE_NO_COPY_CLASS(wxBufferedInputStream)
};
-class WXDLLEXPORT wxFilterOutputStream: public wxOutputStream {
- public:
- wxFilterOutputStream();
- wxFilterOutputStream(wxOutputStream& stream);
- ~wxFilterOutputStream();
+// ----------------------------------------------------------------------------
+// wxBufferedOutputStream
+// ----------------------------------------------------------------------------
+
+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);
- protected:
- wxOutputStream *m_parent_o_stream;
+ // 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;
+
+ DECLARE_NO_COPY_CLASS(wxBufferedOutputStream)
};
-#endif
+#endif // wxUSE_STREAMS
+
+#endif // _WX_WXSTREAM_H__
+
projects / wxWidgets.git / blobdiff