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/////////////////////////////////////////////////////////////////////////////
// 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
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_STREAMS
#include "wx/mstream.h"
#ifndef WX_PRECOMP
#include "wx/stream.h"
#endif //WX_PRECOMP
#include <stdlib.h>
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// wxMemoryInputStream
// ----------------------------------------------------------------------------
IMPLEMENT_ABSTRACT_CLASS(wxMemoryInputStream, wxInputStream)
wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len)
{
m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
m_i_streambuf->SetBufferIO(const_cast<void *>(data), len);
m_i_streambuf->SetIntPosition(0); // seek to start pos
m_i_streambuf->Fixed(true);
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), wxT("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;
}
void
wxMemoryInputStream::InitFromStream(wxInputStream& stream, wxFileOffset lenFile)
{
if ( lenFile == wxInvalidOffset )
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( (wxFileOffset)len == lenFile, wxT("huge files not supported") );
m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
m_i_streambuf->SetBufferIO(len); // create buffer
stream.Read(m_i_streambuf->GetBufferStart(), len);
m_i_streambuf->SetIntPosition(0); // seek to start pos
m_i_streambuf->Fixed(true);
m_length = stream.LastRead();
}
bool wxMemoryInputStream::CanRead() const
{
return m_i_streambuf->GetIntPosition() != m_length;
}
wxMemoryInputStream::~wxMemoryInputStream()
{
delete m_i_streambuf;
}
char wxMemoryInputStream::Peek()
{
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)
{
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;
}
wxFileOffset wxMemoryInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
{
return m_i_streambuf->Seek(pos, mode);
}
wxFileOffset wxMemoryInputStream::OnSysTell() const
{
return m_i_streambuf->Tell();
}
// ----------------------------------------------------------------------------
// wxMemoryOutputStream
// ----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxMemoryOutputStream, wxOutputStream)
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;
}
wxFileOffset wxMemoryOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
{
return m_o_streambuf->Seek(pos, mode);
}
wxFileOffset wxMemoryOutputStream::OnSysTell() const
{
return m_o_streambuf->Tell();
}
size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const
{
wxCHECK_MSG( buffer, 0, wxT("must have buffer to CopyTo") );
if ( len > GetSize() )
len = GetSize();
memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
return len;
}
#endif // wxUSE_STREAMS
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