src/common/mstream.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        mstream.cpp
   3 // Purpose:     "Memory stream" classes
   4 // Author:      Guilhem Lavaux
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "mstream.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20   #pragma hdrstop
  21 #endif
  22
  23 #if wxUSE_STREAMS
  24
  25 #include <stdlib.h>
  26 #include "wx/stream.h"
  27 #include "wx/mstream.h"
  28
  29 // ----------------------------------------------------------------------------
  30 // wxMemoryInputStream
  31 // ----------------------------------------------------------------------------
  32
  33 wxMemoryInputStream::wxMemoryInputStream(const char *data, size_t len)
  34   : wxInputStream()
  35 {
  36   m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
  37   m_i_streambuf->SetBufferIO((char*) data, (char*) (data+len));
  38   m_i_streambuf->SetIntPosition(0); // seek to start pos
  39   m_i_streambuf->Fixed(TRUE);
  40
  41   m_length = len;
  42 }
  43
  44 wxMemoryInputStream::~wxMemoryInputStream()
  45 {
  46   delete m_i_streambuf;
  47 }
  48
  49 char wxMemoryInputStream::Peek()
  50 {
  51   return m_i_streambuf->GetBufferStart()[m_i_streambuf->GetIntPosition()];
  52 }
  53
  54 size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)
  55 {
  56   m_lastcount = 0;
  57   return m_i_streambuf->Read(buffer, nbytes);
  58 }
  59
  60 off_t wxMemoryInputStream::OnSysSeek(off_t pos, wxSeekMode mode)
  61 {
  62   return m_i_streambuf->Seek(pos, mode);
  63 }
  64
  65 off_t wxMemoryInputStream::OnSysTell() const
  66 {
  67   return m_i_streambuf->Tell();
  68 }
  69
  70 // ----------------------------------------------------------------------------
  71 // wxMemoryOutputStream
  72 // ----------------------------------------------------------------------------
  73
  74 wxMemoryOutputStream::wxMemoryOutputStream(char *data, size_t len)
  75   : wxOutputStream()
  76 {
  77   m_o_streambuf = new wxStreamBuffer(wxStreamBuffer::write);
  78   if (data)
  79     m_o_streambuf->SetBufferIO(data, data+len);
  80   m_o_streambuf->Fixed(FALSE);
  81   m_o_streambuf->Flushable(FALSE);
  82 }
  83
  84 wxMemoryOutputStream::~wxMemoryOutputStream()
  85 {
  86   delete m_o_streambuf;
  87 }
  88
  89 size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes)
  90 {
  91   m_lastcount = 0;
  92   return m_o_streambuf->Write(buffer, nbytes);
  93 }
  94
  95 off_t wxMemoryOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
  96 {
  97   return m_o_streambuf->Seek(pos, mode);
  98 }
  99
 100 off_t wxMemoryOutputStream::OnSysTell() const
 101 {
 102   return m_o_streambuf->Tell();
 103 }
 104
 105 size_t wxMemoryOutputStream::CopyTo(char *buffer, size_t len) const
 106 {
 107   if (!buffer)
 108     return 0;
 109
 110   if (len > GetSize())
 111     len = GetSize();
 112
 113   memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
 114   return len;
 115 }
 116
 117 #endif