include/wx/sstream.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/sstream.h
   3 // Purpose:     string-based streams
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     2004-09-19
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2004 Vadim Zeitlin <vadim@wxwindows.org>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_SSTREAM_H_
  13 #define _WX_SSTREAM_H_
  14
  15 #include "wx/stream.h"
  16
  17 #if wxUSE_STREAMS
  18
  19 // ----------------------------------------------------------------------------
  20 // wxStringInputStream is a stream reading from the given (fixed size) string
  21 // ----------------------------------------------------------------------------
  22
  23 class WXDLLIMPEXP_BASE wxStringInputStream : public wxInputStream
  24 {
  25 public:
  26     // ctor associates the stream with the given string which makes a copy of
  27     // it
  28     wxStringInputStream(const wxString& s);
  29
  30     virtual wxFileOffset GetLength() const;
  31
  32 protected:
  33     virtual wxFileOffset OnSysSeek(wxFileOffset ofs, wxSeekMode mode);
  34     virtual wxFileOffset OnSysTell() const;
  35     virtual size_t OnSysRead(void *buffer, size_t size);
  36
  37 private:
  38     // the string that was passed in the ctor
  39     wxString m_str;
  40
  41     // the buffer we're reading from
  42     wxCharBuffer m_buf;
  43
  44     // length of the buffer we're reading from
  45     size_t m_len;
  46
  47     // position in the stream in bytes, *not* in chars
  48     size_t m_pos;
  49
  50     DECLARE_NO_COPY_CLASS(wxStringInputStream)
  51 };
  52
  53 // ----------------------------------------------------------------------------
  54 // wxStringOutputStream writes data to the given string, expanding it as needed
  55 // ----------------------------------------------------------------------------
  56
  57 class WXDLLIMPEXP_BASE wxStringOutputStream : public wxOutputStream
  58 {
  59 public:
  60     // The stream will write data either to the provided string or to an
  61     // internal string which can be retrieved using GetString()
  62     wxStringOutputStream(wxString *pString = NULL)
  63 #if wxUSE_UNICODE_WCHAR
  64         : m_unconv(0)
  65 #endif // wxUSE_UNICODE_WCHAR
  66     {
  67         m_str = pString ? pString : &m_strInternal;
  68         m_pos = m_str->length() / sizeof(wxChar);
  69     }
  70
  71     // get the string containing current output
  72     const wxString& GetString() const { return *m_str; }
  73
  74 protected:
  75     virtual wxFileOffset OnSysTell() const;
  76     virtual size_t OnSysWrite(const void *buffer, size_t size);
  77
  78 private:
  79     // internal string, not used if caller provided his own string
  80     wxString m_strInternal;
  81
  82     // pointer given by the caller or just pointer to m_strInternal
  83     wxString *m_str;
  84
  85     // position in the stream in bytes, *not* in chars
  86     size_t m_pos;
  87
  88 #if wxUSE_WCHAR_T
  89     // string encoding converter (UTF8 is the standard)
  90     wxMBConvUTF8 m_conv;
  91 #else
  92     wxMBConv m_conv;
  93 #endif
  94
  95 #if wxUSE_UNICODE_WCHAR
  96     // unconverted data from the last call to OnSysWrite()
  97     wxMemoryBuffer m_unconv;
  98 #endif // wxUSE_UNICODE_WCHAR
  99
 100     DECLARE_NO_COPY_CLASS(wxStringOutputStream)
 101 };
 102
 103 #endif // wxUSE_STREAMS
 104
 105 #endif // _WX_SSTREAM_H_
 106