src/common/ipcbase.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/ipcbase.cpp
   3 // Purpose:     IPC base classes
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #ifndef WX_PRECOMP
  20 #endif
  21
  22 #include "wx/ipcbase.h"
  23
  24 IMPLEMENT_CLASS(wxServerBase, wxObject)
  25 IMPLEMENT_CLASS(wxClientBase, wxObject)
  26 IMPLEMENT_CLASS(wxConnectionBase, wxObject)
  27
  28 wxConnectionBase::wxConnectionBase(void *buffer, size_t bytes)
  29     : m_buffer((char *)buffer),
  30       m_buffersize(bytes),
  31       m_deletebufferwhendone(false),
  32       m_connected(true)
  33 {
  34   if ( buffer == NULL )
  35   { // behave like next constructor
  36     m_buffersize = 0;
  37     m_deletebufferwhendone = true;
  38   }
  39 }
  40
  41 wxConnectionBase::wxConnectionBase()
  42     : m_buffer(NULL),
  43       m_buffersize(0),
  44       m_deletebufferwhendone(true),
  45       m_connected(true)
  46 {
  47 }
  48
  49 wxConnectionBase::wxConnectionBase(const wxConnectionBase& copy)
  50     : wxObject(),
  51       m_buffer(copy.m_buffer),
  52       m_buffersize(copy.m_buffersize),
  53       m_deletebufferwhendone(false),
  54       m_connected(copy.m_connected)
  55
  56 {
  57   // copy constructor would require ref-counted pointer to buffer
  58   wxFAIL_MSG( _T("Copy constructor of wxConnectionBase not implemented") );
  59 }
  60
  61
  62 wxConnectionBase::~wxConnectionBase()
  63 {
  64   if ( m_deletebufferwhendone )
  65     delete m_buffer;
  66 }
  67
  68 /* static */
  69 wxString wxConnectionBase::GetTextFromData(const void* data,
  70                                            size_t size,
  71                                            wxIPCFormat fmt)
  72 {
  73     wxString s;
  74     switch ( fmt )
  75     {
  76         case wxIPC_TEXT:
  77             // normally the string should be NUL-terminated and size should
  78             // include the total size of the buffer, including NUL -- but don't
  79             // crash (by trying to access (size_t)-1 bytes) if it doesn't
  80             if ( size )
  81                 size--;
  82
  83             s = wxString(wx_static_cast(const char *, data), size);
  84             break;
  85
  86 #if wxUSE_UNICODE
  87         // TODO: we should handle both wxIPC_UTF16TEXT and wxIPC_UTF32TEXT here
  88         //       for inter-platform IPC
  89         case wxIPC_UNICODETEXT:
  90             wxASSERT_MSG( !(size % sizeof(wchar_t)), "invalid buffer size" );
  91             if ( size )
  92             {
  93                 size /= sizeof(wchar_t);
  94                 size--;
  95             }
  96
  97             s = wxString(wx_static_cast(const wchar_t *, data), size);
  98             break;
  99
 100         case wxIPC_UTF8TEXT:
 101             if ( size )
 102                 size--;
 103
 104             s = wxString::FromUTF8(wx_static_cast(const char *, data), size);
 105             break;
 106 #endif // wxUSE_UNICODE
 107
 108         default:
 109             wxFAIL_MSG( "non-string IPC format in GetTextFromData()" );
 110     }
 111
 112     return s;
 113 }
 114
 115 void *wxConnectionBase::GetBufferAtLeast( size_t bytes )
 116 {
 117   if ( m_buffersize >= bytes )
 118     return m_buffer;
 119   else
 120   {  // need to resize buffer
 121     if ( m_deletebufferwhendone )
 122     { // we're in charge of buffer, increase it
 123       if ( m_buffer )
 124         delete m_buffer;
 125       m_buffer = new char[bytes];
 126       m_buffersize = bytes;
 127       return m_buffer;
 128     } // user-supplied buffer, fail
 129     else
 130       return NULL;
 131   }
 132 }