Typo fix

[wxWidgets.git] / src / common / mstream.cpp

diff --git a/src/common/mstream.cpp b/src/common/mstream.cpp
index 4555d350620e77356e03dc02ec3edb51ecf61465..f7786777284e9b4c4e24f0a1a116347aba08e98d 100644 (file)
--- a/src/common/mstream.cpp
+++ b/src/common/mstream.cpp
@@ -1,103 +1,174 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        mstream.cpp
+// Name:        src/common/mstream.cpp
 // Purpose:     "Memory stream" classes
 // Author:      Guilhem Lavaux
-// Modified by:
+// Modified by: VZ (23.11.00): general code review
 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Guilhem Lavaux
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
-#pragma implementation "mstream.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-  #pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #if wxUSE_STREAMS
 
+#include "wx/mstream.h"
+
+#ifndef   WX_PRECOMP
+    #include  "wx/stream.h"
+#endif  //WX_PRECOMP
+
 #include <stdlib.h>
-#include <wx/stream.h>
-#include <wx/mstream.h>
+
+// ============================================================================
+// implementation
+// ============================================================================
 
 // ----------------------------------------------------------------------------
 // wxMemoryInputStream
 // ----------------------------------------------------------------------------
 
-wxMemoryInputStream::wxMemoryInputStream(const char *data, size_t len)
-  : wxInputStream()
+wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len)
 {
-  m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
-  m_i_streambuf->SetBufferIO((char*) data, (char*) (data+len));
-  m_i_streambuf->SetIntPosition(0); // seek to start pos
-  m_i_streambuf->Fixed(TRUE);
+    m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
+    m_i_streambuf->SetBufferIO((void *)data, len); // const_cast
+    m_i_streambuf->SetIntPosition(0); // seek to start pos
+    m_i_streambuf->Fixed(true);
+
+    m_length = len;
+}
 
-  m_length = len;
+wxMemoryInputStream::wxMemoryInputStream(const wxMemoryOutputStream& stream)
+{
+    const wxFileOffset lenFile = stream.GetLength();
+    if ( lenFile == wxInvalidOffset )
+    {
+        m_i_streambuf = NULL;
+        m_lasterror = wxSTREAM_EOF;
+        return;
+    }
+
+    const size_t len = wx_truncate_cast(size_t, lenFile);
+    wxASSERT_MSG( len == lenFile + size_t(0), _T("huge files not supported") );
+
+    m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
+    m_i_streambuf->SetBufferIO(len); // create buffer
+    stream.CopyTo(m_i_streambuf->GetBufferStart(), len);
+    m_i_streambuf->SetIntPosition(0); // seek to start pos
+    m_i_streambuf->Fixed(true);
+    m_length = len;
 }
 
 wxMemoryInputStream::~wxMemoryInputStream()
 {
-  delete m_i_streambuf;
+    delete m_i_streambuf;
 }
 
 char wxMemoryInputStream::Peek()
 {
-  return m_i_streambuf->GetBufferStart()[m_i_streambuf->GetIntPosition()];
+    char *buf = (char *)m_i_streambuf->GetBufferStart();
+    size_t pos = m_i_streambuf->GetIntPosition();
+    if ( pos == m_length )
+    {
+        m_lasterror = wxSTREAM_READ_ERROR;
+
+        return 0;
+    }
+
+    return buf[pos];
 }
 
 size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)
 {
-  return m_i_streambuf->Read(buffer, nbytes);
+    size_t pos = m_i_streambuf->GetIntPosition();
+    if ( pos == m_length )
+    {
+        m_lasterror = wxSTREAM_EOF;
+
+        return 0;
+    }
+
+    m_i_streambuf->Read(buffer, nbytes);
+    m_lasterror = wxSTREAM_NO_ERROR;
+
+    return m_i_streambuf->GetIntPosition() - pos;
 }
 
-off_t wxMemoryInputStream::OnSysSeek(off_t pos, wxSeekMode mode)
+wxFileOffset wxMemoryInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
 {
-  return m_i_streambuf->Seek(pos, mode);
+    return m_i_streambuf->Seek(pos, mode);
 }
 
-off_t wxMemoryInputStream::OnSysTell() const
+wxFileOffset wxMemoryInputStream::OnSysTell() const
 {
-  return m_i_streambuf->Tell();
+    return m_i_streambuf->Tell();
 }
 
 // ----------------------------------------------------------------------------
 // wxMemoryOutputStream
 // ----------------------------------------------------------------------------
 
-wxMemoryOutputStream::wxMemoryOutputStream(char *data, size_t len)
-  : wxOutputStream()
+wxMemoryOutputStream::wxMemoryOutputStream(void *data, size_t len)
 {
-  m_o_streambuf = new wxStreamBuffer(wxStreamBuffer::write);
-  if (data)
-    m_o_streambuf->SetBufferIO(data, data+len);
-  m_o_streambuf->Fixed(TRUE);
+    m_o_streambuf = new wxStreamBuffer(wxStreamBuffer::write);
+    if ( data )
+        m_o_streambuf->SetBufferIO(data, len);
+    m_o_streambuf->Fixed(false);
+    m_o_streambuf->Flushable(false);
 }
 
 wxMemoryOutputStream::~wxMemoryOutputStream()
 {
-  delete m_o_streambuf;
+    delete m_o_streambuf;
 }
 
 size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes)
 {
-  return m_o_streambuf->Write(buffer, nbytes);
+    size_t oldpos = m_o_streambuf->GetIntPosition();
+    m_o_streambuf->Write(buffer, nbytes);
+    size_t newpos = m_o_streambuf->GetIntPosition();
+
+    // FIXME can someone please explain what this does? (VZ)
+    if ( !newpos )
+        newpos = m_o_streambuf->GetBufferSize();
+
+    return newpos - oldpos;
 }
 
-off_t wxMemoryOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
+wxFileOffset wxMemoryOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
 {
-  return m_o_streambuf->Seek(pos, mode);
+    return m_o_streambuf->Seek(pos, mode);
 }
 
-off_t wxMemoryOutputStream::OnSysTell() const
+wxFileOffset wxMemoryOutputStream::OnSysTell() const
 {
-  return m_o_streambuf->Tell();
+    return m_o_streambuf->Tell();
 }
 
+size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const
+{
+    wxCHECK_MSG( buffer, 0, _T("must have buffer to CopyTo") );
 
-#endif
+    if ( len > GetSize() )
+        len = GetSize();
+
+    memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
+
+    return len;
+}
+
+#endif // wxUSE_STREAMS