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wxWindows-2.4.0
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mstream.cpp
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C/C++ Source or Header
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2002-11-04
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152 lines
/////////////////////////////////////////////////////////////////////////////
// Name: src/common/mstream.cpp
// Purpose: "Memory stream" classes
// Author: Guilhem Lavaux
// Modified by: VZ (23.11.00): general code review
// Created: 04/01/98
// RCS-ID: $Id: mstream.cpp,v 1.24.2.1 2002/11/04 19:31:55 VZ Exp $
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "mstream.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_STREAMS
#include <stdlib.h>
#include "wx/stream.h"
#include "wx/mstream.h"
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// wxMemoryInputStream
// ----------------------------------------------------------------------------
wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len)
{
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;
}
wxMemoryInputStream::~wxMemoryInputStream()
{
delete m_i_streambuf;
}
char wxMemoryInputStream::Peek()
{
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 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)
{
return m_i_streambuf->Seek(pos, mode);
}
off_t wxMemoryInputStream::OnSysTell() const
{
return m_i_streambuf->Tell();
}
// ----------------------------------------------------------------------------
// wxMemoryOutputStream
// ----------------------------------------------------------------------------
wxMemoryOutputStream::wxMemoryOutputStream(void *data, size_t len)
{
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;
}
size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t 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)
{
return m_o_streambuf->Seek(pos, mode);
}
off_t wxMemoryOutputStream::OnSysTell() const
{
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") );
if ( len > GetSize() )
len = GetSize();
memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
return len;
}
#endif // wxUSE_STREAMS