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 __WXSTREAM_H__
  13 #define __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 class WXDLLEXPORT wxStreamBuffer {
  33  public:
  34   wxStreamBuffer(wxInputStream& stream);
  35   wxStreamBuffer(wxOutputStream& stream);
  36   ~wxStreamBuffer();
  37
  38   void Read(void *buffer, size_t size);
  39   void Write(const void *buffer, size_t size);
  40   void WriteBack(char c);
  41
  42   void SetBufferIO(char *buffer_start, char *buffer_end);
  43   void SetBufferIO(size_t bufsize);
  44   void ResetBuffer();
  45
  46   void SetBufferPosition(char *buffer_position)
  47                                   { m_buffer_pos = buffer_position; }
  48   void SetIntPosition(size_t pos)
  49                      { m_buffer_pos = m_buffer_start + pos; }
  50   char *GetBufferPosition() const { return m_buffer_pos; }
  51   size_t GetIntPosition() const { return m_buffer_pos - m_buffer_start; }
  52
  53   char *GetBufferStart() const    { return m_buffer_start; }
  54   char *GetBufferEnd() const      { return m_buffer_end; }
  55   size_t GetBufferSize() const    { return m_buffer_size; }
  56   size_t GetLastAccess() const      { return m_buffer_end - m_buffer_start; }
  57
  58  protected:
  59   char *m_buffer_start, *m_buffer_end, *m_buffer_pos;
  60   size_t m_buffer_size;
  61
  62   wxInputStream *m_istream;
  63   wxOutputStream *m_ostream;
  64 };
  65
  66 /*
  67  * wxStream: base classes
  68  */
  69 class WXDLLEXPORT wxInputStream {
  70  public:
  71   wxInputStream();
  72   virtual ~wxInputStream();
  73
  74   // IO functions
  75   virtual char Peek() = 0;
  76   virtual char GetC();
  77   virtual wxInputStream& Read(void *buffer, size_t size);
  78   wxInputStream& Read(wxOutputStream& stream_out);
  79
  80   // Position functions
  81   off_t SeekI(off_t pos, wxSeekMode mode = wxFromStart);
  82   off_t TellI() const;
  83
  84   // State functions
  85   bool Eof() const { return m_eof; }
  86   size_t LastRead() { return m_lastread; }
  87   wxStreamBuffer *InputStreamBuffer() { return m_i_streambuf; }
  88
  89   // Operators
  90   wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
  91   wxInputStream& operator>>(wxString& line);
  92   wxInputStream& operator>>(char& c);
  93   wxInputStream& operator>>(short& i);
  94   wxInputStream& operator>>(long& i);
  95   wxInputStream& operator>>(float& i);
  96   wxInputStream& operator>>( __wxInputManip func) { return func(*this); }
  97
  98  protected:
  99   friend class wxStreamBuffer;
 100   friend class wxFilterInputStream;
 101
 102   wxInputStream(wxStreamBuffer *buffer);
 103
 104   virtual size_t DoRead(void *buffer, size_t size) = 0;
 105   virtual off_t DoSeekInput(off_t pos, wxSeekMode mode) = 0;
 106   virtual off_t DoTellInput() const = 0;
 107
 108  protected:
 109   bool m_eof, m_i_destroybuf;
 110   size_t m_lastread;
 111   wxStreamBuffer *m_i_streambuf;
 112 };
 113
 114 class WXDLLEXPORT wxOutputStream {
 115  public:
 116   wxOutputStream();
 117   virtual ~wxOutputStream();
 118
 119   virtual wxOutputStream& Write(const void *buffer, size_t size);
 120   wxOutputStream& Write(wxInputStream& stream_in);
 121
 122   virtual off_t SeekO(off_t pos, wxSeekMode mode = wxFromStart);
 123   virtual off_t TellO() const;
 124
 125   virtual bool Bad() const { return m_bad; }
 126   virtual size_t LastWrite() const { return m_lastwrite; }
 127   wxStreamBuffer *OutputStreamBuffer() { return m_o_streambuf; }
 128
 129   virtual void Sync();
 130
 131   wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
 132   wxOutputStream& operator<<(const char *string);
 133   wxOutputStream& operator<<(wxString& string);
 134   wxOutputStream& operator<<(char c);
 135   wxOutputStream& operator<<(short i);
 136   wxOutputStream& operator<<(int i);
 137   wxOutputStream& operator<<(long i);
 138   wxOutputStream& operator<<(double f);
 139
 140   wxOutputStream& operator<<(float f) { return operator<<((double)f); }
 141   wxOutputStream& operator<<(unsigned char c) { return operator<<((char)c); }
 142   wxOutputStream& operator<<(unsigned short i) { return operator<<((short)i); }
 143   wxOutputStream& operator<<(unsigned int i) { return operator<<((int)i); }
 144   wxOutputStream& operator<<(unsigned long i) { return operator<<((long)i); }
 145
 146   wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); }
 147
 148  protected:
 149   friend class wxStreamBuffer;
 150   friend class wxFilterOutputStream;
 151
 152   wxOutputStream(wxStreamBuffer *buffer);
 153
 154   virtual size_t DoWrite(const void *buffer, size_t size) = 0;
 155   virtual off_t DoSeekOutput(off_t pos, wxSeekMode mode) = 0;
 156   virtual off_t DoTellOutput() const = 0;
 157
 158  protected:
 159   bool m_bad, m_o_destroybuf;
 160   size_t m_lastwrite;
 161   wxStreamBuffer *m_o_streambuf;
 162 };
 163
 164 /*
 165  * "Filter" streams
 166  */
 167
 168 class WXDLLEXPORT wxFilterInputStream: public wxInputStream {
 169  public:
 170   wxFilterInputStream(wxInputStream& stream);
 171   virtual ~wxFilterInputStream();
 172
 173   virtual char Peek() { return m_parent_i_stream->Peek(); }
 174
 175   virtual bool Eof() const { return m_parent_i_stream->Eof(); }
 176   virtual size_t LastRead() const { return m_parent_i_stream->LastRead(); }
 177
 178  protected:
 179   virtual size_t DoRead(void *buffer, size_t size);
 180   virtual off_t DoSeekInput(off_t pos, wxSeekMode mode);
 181   virtual off_t DoTellInput() const;
 182
 183  protected:
 184   wxInputStream *m_parent_i_stream;
 185 };
 186
 187 class WXDLLEXPORT wxFilterOutputStream: public wxOutputStream {
 188  public:
 189   wxFilterOutputStream(wxOutputStream& stream);
 190   virtual ~wxFilterOutputStream();
 191
 192   virtual bool Bad() const { return m_parent_o_stream->Bad(); }
 193   virtual size_t LastWrite() const { return m_parent_o_stream->LastWrite(); }
 194
 195  protected:
 196
 197   // The forward is implicitely done by wxStreamBuffer.
 198
 199   virtual size_t DoWrite(const void *buffer, size_t size);
 200   virtual off_t DoSeekOutput(off_t pos, wxSeekMode mode);
 201   virtual off_t DoTellOutput() const;
 202
 203  protected:
 204   wxOutputStream *m_parent_o_stream;
 205 };
 206
 207 #endif