include/wx/stream.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        stream.h
   3 // Purpose:     "wxWindows stream" base classes
   4 // Author:      Guilhem Lavaux
   5 // Modified by:
   6 // Created:     11/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_WXSTREAM_H__
  13 #define _WX_WXSTREAM_H__
  14
  15 #ifdef __GNUG__
  16 #pragma interface
  17 #endif
  18
  19 #include <stdio.h>
  20 #include "wx/object.h"
  21 #include "wx/string.h"
  22 #include "wx/filefn.h"  // for off_t, wxInvalidOffset and wxSeekMode
  23
  24 class WXDLLEXPORT wxInputStream;
  25 class WXDLLEXPORT wxOutputStream;
  26
  27 typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
  28 typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
  29
  30 wxOutputStream& WXDLLEXPORT wxEndL(wxOutputStream& o_stream);
  31
  32 // ---------------------------------------------------------------------------
  33 // Stream buffer
  34 // ---------------------------------------------------------------------------
  35
  36 class WXDLLEXPORT wxStreamBuffer {
  37  public:
  38   wxStreamBuffer(wxInputStream& stream);
  39   wxStreamBuffer(wxOutputStream& stream);
  40   ~wxStreamBuffer();
  41
  42   void Read(void *buffer, size_t size);
  43   void Write(const void *buffer, size_t size);
  44   void WriteBack(char c);
  45
  46   void SetBufferIO(char *buffer_start, char *buffer_end);
  47   void SetBufferIO(size_t bufsize);
  48   void ResetBuffer();
  49
  50   void SetBufferPosition(char *buffer_position)
  51                                   { m_buffer_pos = buffer_position; }
  52   void SetIntPosition(size_t pos)
  53                      { m_buffer_pos = m_buffer_start + pos; }
  54   char *GetBufferPosition() const { return m_buffer_pos; }
  55   size_t GetIntPosition() const { return m_buffer_pos - m_buffer_start; }
  56
  57   char *GetBufferStart() const    { return m_buffer_start; }
  58   char *GetBufferEnd() const      { return m_buffer_end; }
  59   size_t GetBufferSize() const    { return m_buffer_size; }
  60   size_t GetLastAccess() const      { return m_buffer_end - m_buffer_start; }
  61
  62  protected:
  63   char *m_buffer_start, *m_buffer_end, *m_buffer_pos;
  64   size_t m_buffer_size;
  65
  66   wxInputStream *m_istream;
  67   wxOutputStream *m_ostream;
  68 };
  69
  70 // ---------------------------------------------------------------------------
  71 // wxStream: base classes
  72 // ---------------------------------------------------------------------------
  73
  74 class WXDLLEXPORT wxInputStream {
  75  public:
  76   wxInputStream();
  77   virtual ~wxInputStream();
  78
  79   // IO functions
  80   virtual char Peek() { return 0; }
  81   virtual char GetC();
  82   virtual wxInputStream& Read(void *buffer, size_t size);
  83   wxInputStream& Read(wxOutputStream& stream_out);
  84
  85   // Position functions
  86   virtual off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
  87   virtual off_t TellI() const;
  88
  89   // State functions
  90   bool Eof() const { return m_eof; }
  91   size_t LastRead() { return m_lastread; }
  92   wxStreamBuffer *InputStreamBuffer() { return m_i_streambuf; }
  93
  94   // Operators
  95   wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
  96   wxInputStream& operator>>(wxString& line);
  97   wxInputStream& operator>>(char& c);
  98   wxInputStream& operator>>(short& i);
  99   wxInputStream& operator>>(int& i);
 100   wxInputStream& operator>>(long& i);
 101   wxInputStream& operator>>(float& i);
 102 #if USE_SERIAL
 103   wxInputStream& operator>>(wxObject *& obj);
 104 #endif
 105
 106   wxInputStream& operator>>(unsigned char& c) { return operator>>((char&)c); }
 107   wxInputStream& operator>>(unsigned short& i) { return operator>>((short&)i); }
 108   wxInputStream& operator>>(unsigned int& i) { return operator>>((int&)i); }
 109   wxInputStream& operator>>(unsigned long& i) { return operator>>((long&)i); }
 110   wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
 111
 112  protected:
 113   friend class wxStreamBuffer;
 114   friend class wxFilterInputStream;
 115
 116   wxInputStream(wxStreamBuffer *buffer);
 117
 118   virtual size_t DoRead(void *WXUNUSED(buffer), size_t WXUNUSED(size) )
 119          { return 0; }
 120   virtual off_t DoSeekInput( off_t WXUNUSED(pos), wxSeekMode WXUNUSED(mode) )
 121          { return wxInvalidOffset; }
 122   virtual off_t DoTellInput() const
 123          { return wxInvalidOffset; }
 124
 125  protected:
 126   bool m_eof, m_i_destroybuf;
 127   size_t m_lastread;
 128   wxStreamBuffer *m_i_streambuf;
 129 };
 130
 131 class WXDLLEXPORT wxOutputStream {
 132  public:
 133   wxOutputStream();
 134   virtual ~wxOutputStream();
 135
 136   virtual wxOutputStream& Write(const void *buffer, size_t size);
 137   wxOutputStream& Write(wxInputStream& stream_in);
 138
 139   virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
 140   virtual off_t TellO() const;
 141
 142   virtual bool Bad() const { return m_bad; }
 143   virtual size_t LastWrite() const { return m_lastwrite; }
 144   wxStreamBuffer *OutputStreamBuffer() { return m_o_streambuf; }
 145
 146   virtual void Sync();
 147
 148   wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
 149   wxOutputStream& operator<<(const char *string);
 150   wxOutputStream& operator<<(wxString& string);
 151   wxOutputStream& operator<<(char c);
 152   wxOutputStream& operator<<(short i);
 153   wxOutputStream& operator<<(int i);
 154   wxOutputStream& operator<<(long i);
 155   wxOutputStream& operator<<(double f);
 156 #if USE_SERIAL
 157   wxOutputStream& operator<<(wxObject& obj);
 158 #endif
 159
 160   wxOutputStream& operator<<(float f) { return operator<<((double)f); }
 161   wxOutputStream& operator<<(unsigned char c) { return operator<<((char)c); }
 162   wxOutputStream& operator<<(unsigned short i) { return operator<<((short)i); }
 163   wxOutputStream& operator<<(unsigned int i) { return operator<<((int)i); }
 164   wxOutputStream& operator<<(unsigned long i) { return operator<<((long)i); }
 165   wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); }
 166
 167  protected:
 168   friend class wxStreamBuffer;
 169   friend class wxFilterOutputStream;
 170
 171   wxOutputStream(wxStreamBuffer *buffer);
 172
 173   virtual size_t DoWrite( const void *WXUNUSED(buffer), size_t WXUNUSED(size) )
 174             { return 0; }
 175   virtual off_t DoSeekOutput( off_t WXUNUSED(pos), wxSeekMode WXUNUSED(mode) )
 176             { return wxInvalidOffset; }
 177   virtual off_t DoTellOutput() const
 178             { return wxInvalidOffset; }
 179
 180  protected:
 181   bool m_bad, m_o_destroybuf;
 182   size_t m_lastwrite;
 183   wxStreamBuffer *m_o_streambuf;
 184 };
 185
 186 class wxStream: public virtual wxInputStream,
 187                 public virtual wxOutputStream
 188 {
 189  public:
 190   wxStream();
 191 };
 192
 193 // ---------------------------------------------------------------------------
 194 // "Filter" streams
 195 // ---------------------------------------------------------------------------
 196
 197 class WXDLLEXPORT wxFilterInputStream: public virtual wxInputStream {
 198  public:
 199   wxFilterInputStream();
 200   wxFilterInputStream(wxInputStream& stream);
 201   ~wxFilterInputStream();
 202
 203   char Peek() { return m_parent_i_stream->Peek(); }
 204
 205   bool Eof() const { return m_parent_i_stream->Eof(); }
 206   size_t LastRead() const { return m_parent_i_stream->LastRead(); }
 207   off_t TellI() const { return m_parent_i_stream->TellI(); }
 208
 209  protected:
 210   size_t DoRead(void *buffer, size_t size);
 211   off_t DoSeekInput(off_t pos, wxSeekMode mode);
 212   off_t DoTellInput() const;
 213
 214  protected:
 215   wxInputStream *m_parent_i_stream;
 216 };
 217
 218 class WXDLLEXPORT wxFilterOutputStream: public virtual wxOutputStream {
 219  public:
 220   wxFilterOutputStream();
 221   wxFilterOutputStream(wxOutputStream& stream);
 222   virtual ~wxFilterOutputStream();
 223
 224   bool Bad() const { return m_parent_o_stream->Bad(); }
 225   size_t LastWrite() const { return m_parent_o_stream->LastWrite(); }
 226   off_t TellO() const { return m_parent_o_stream->TellO(); }
 227
 228  protected:
 229   // The forward is implicitely done by wxStreamBuffer.
 230
 231   size_t DoWrite(const void *buffer, size_t size);
 232   off_t DoSeekOutput(off_t pos, wxSeekMode mode);
 233   off_t DoTellOutput() const;
 234
 235  protected:
 236   wxOutputStream *m_parent_o_stream;
 237 };
 238
 239 class WXDLLEXPORT wxFilterStream: public wxStream,
 240                                   public virtual wxFilterInputStream,
 241                                   public virtual wxFilterOutputStream {
 242  public:
 243   wxFilterStream(wxStream& stream);
 244   wxFilterStream();
 245 };
 246
 247 #endif