/////////////////////////////////////////////////////////////////////////////
-// 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
/////////////////////////////////////////////////////////////////////////////
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
#ifdef __GNUG__
#pragma implementation "mstream.h"
#endif
#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()
{
- 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();
+
+ return buf[m_i_streambuf->GetIntPosition()];
+}
+
+bool wxMemoryInputStream::Eof() const
+{
+ return !m_i_streambuf->GetBytesLeft();
}
size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)
-{
- size_t bufsize = m_i_streambuf->GetBufferEnd() - m_i_streambuf->GetBufferStart();
- size_t oldpos = m_i_streambuf->GetIntPosition();
- m_i_streambuf->Read(buffer, nbytes);
- size_t newpos = m_i_streambuf->GetIntPosition();
- if (newpos == 0) return bufsize - oldpos;
- else return newpos - oldpos;
+{
+ 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_NOERROR;
+
+ return m_i_streambuf->GetIntPosition() - pos;
}
off_t wxMemoryInputStream::OnSysSeek(off_t pos, wxSeekMode mode)
{
- return m_i_streambuf->Seek(pos, mode);
+ return m_i_streambuf->Seek(pos, mode);
}
off_t 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(FALSE);
- m_o_streambuf->Flushable(FALSE);
+ 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)
{
- size_t bufsize = m_o_streambuf->GetBufferEnd() - m_o_streambuf->GetBufferStart();
- size_t oldpos = m_o_streambuf->GetIntPosition();
- m_o_streambuf->Write(buffer, nbytes);
- size_t newpos = m_o_streambuf->GetIntPosition();
- if (newpos == 0) return bufsize - oldpos;
- else return newpos - oldpos;
+ 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)
{
- return m_o_streambuf->Seek(pos, mode);
+ return m_o_streambuf->Seek(pos, mode);
}
off_t wxMemoryOutputStream::OnSysTell() const
{
- return m_o_streambuf->Tell();
+ return m_o_streambuf->Tell();
}
-size_t wxMemoryOutputStream::CopyTo(char *buffer, size_t len) const
+size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const
{
- if (!buffer)
- return 0;
+ wxCHECK_MSG( buffer, 0, _T("must have buffer to CopyTo") );
- if (len > GetSize())
- len = GetSize();
+ if ( len > GetSize() )
+ len = GetSize();
- memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
- return len;
+ memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
+
+ return len;
}
-#endif
+#endif // wxUSE_STREAMS