some != NULL checks

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

/////////////////////////////////////////////////////////////////////////////
// Name:        fstream.cpp
// Purpose:     "File stream" classes
// Author:      Julian Smart
// Modified by:
// Created:     11/07/98
// RCS-ID:      $Id$
// Copyright:   (c) Guilhem Lavaux 
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "wfstream.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

#if wxUSE_STREAMS && wxUSE_FILE

#include <stdio.h>
#include "wx/stream.h"
#include "wx/wfstream.h"

// ----------------------------------------------------------------------------
// wxFileInputStream
// ----------------------------------------------------------------------------

wxFileInputStream::wxFileInputStream(const wxString& fileName)
  : wxInputStream()
{
  m_file = new wxFile(fileName, wxFile::read);
  m_file_destroy = TRUE;
}

wxFileInputStream::wxFileInputStream()
  : wxInputStream()
{
  m_file_destroy = FALSE;
  m_file = NULL;
}

wxFileInputStream::wxFileInputStream(wxFile& file)
{
  m_file = &file;
  m_file_destroy = FALSE;
}

wxFileInputStream::wxFileInputStream(int fd)
{
  m_file = new wxFile(fd);
  m_file_destroy = TRUE;
}

wxFileInputStream::~wxFileInputStream()
{
  if (m_file_destroy)
    delete m_file;
}

size_t wxFileInputStream::GetSize() const
{
  return m_file->Length();
}

size_t wxFileInputStream::OnSysRead(void *buffer, size_t size)
{
  off_t ret;

  ret = m_file->Read(buffer, size);

  m_lasterror = wxStream_NOERROR;
  if (m_file->Eof())
    m_lasterror = wxStream_EOF;
  if (ret == wxInvalidOffset) {
    m_lasterror = wxStream_READ_ERR;
    ret = 0;
  } 

  return ret;
}

off_t wxFileInputStream::OnSysSeek(off_t pos, wxSeekMode mode)
{
  return m_file->Seek(pos, mode);
}

off_t wxFileInputStream::OnSysTell() const
{
  return m_file->Tell();
}

// ----------------------------------------------------------------------------
// wxFileOutputStream
// ----------------------------------------------------------------------------

wxFileOutputStream::wxFileOutputStream(const wxString& fileName)
{
  m_file = new wxFile(fileName, wxFile::write);
  m_file_destroy = TRUE;
}

wxFileOutputStream::wxFileOutputStream(wxFile& file)
{
  m_file = &file;
  m_file_destroy = FALSE;
}

wxFileOutputStream::wxFileOutputStream()
  : wxOutputStream()
{
  m_file_destroy = FALSE;
  m_file = NULL;
}

wxFileOutputStream::wxFileOutputStream(int fd)
{
  m_file = new wxFile(fd);
  m_file_destroy = TRUE;
}

wxFileOutputStream::~wxFileOutputStream()
{
  if (m_file_destroy) {
    Sync();
    delete m_file;
  }
}

size_t wxFileOutputStream::OnSysWrite(const void *buffer, size_t size)
{
  size_t ret = m_file->Write(buffer, size);
  if (m_file->Error())
    m_lasterror = wxStream_WRITE_ERR;
  else
    m_lasterror = wxStream_NOERROR;
  return ret;
}

off_t wxFileOutputStream::OnSysTell() const
{
  return m_file->Tell();
}

off_t wxFileOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
{
  return m_file->Seek(pos, mode);
}

void wxFileOutputStream::Sync()
{
  wxOutputStream::Sync();
  m_file->Flush();
}

size_t wxFileOutputStream::GetSize() const
{
  return m_file->Length();
}

// ----------------------------------------------------------------------------
// wxFileStream
// ----------------------------------------------------------------------------
wxFileStream::wxFileStream(const wxString& fileName)
 : wxFileInputStream(fileName), wxFileOutputStream(*wxFileInputStream::m_file)
{
}

// ----------------------------------------------------------------------------
// wxFFileInputStream
// ----------------------------------------------------------------------------

wxFFileInputStream::wxFFileInputStream(const wxString& fileName)
  : wxInputStream()
{
  m_file = new wxFFile(fileName, "r");
  m_file_destroy = TRUE;
}

wxFFileInputStream::wxFFileInputStream()
  : wxInputStream()
{
  m_file_destroy = FALSE;
  m_file = NULL;
}

wxFFileInputStream::wxFFileInputStream(wxFFile& file)
{
  m_file = &file;
  m_file_destroy = FALSE;
}

wxFFileInputStream::wxFFileInputStream(FILE *file)
{
  m_file = new wxFFile(file);
  m_file_destroy = TRUE;
}

wxFFileInputStream::~wxFFileInputStream()
{
  if (m_file_destroy)
    delete m_file;
}

size_t wxFFileInputStream::GetSize() const
{
  return m_file->Length();
}

size_t wxFFileInputStream::OnSysRead(void *buffer, size_t size)
{
  off_t ret;

  ret = m_file->Read(buffer, size);

  if (m_file->Eof())
    m_lasterror = wxStream_EOF;
  if (ret == wxInvalidOffset) {
    m_lasterror = wxStream_READ_ERR;
    ret = 0;
  } 

  return ret;
}

off_t wxFFileInputStream::OnSysSeek(off_t pos, wxSeekMode mode)
{
  return m_file->Seek(pos, mode);
}

off_t wxFFileInputStream::OnSysTell() const
{
  return m_file->Tell();
}

// ----------------------------------------------------------------------------
// wxFFileOutputStream
// ----------------------------------------------------------------------------

wxFFileOutputStream::wxFFileOutputStream(const wxString& fileName)
{
  m_file = new wxFFile(fileName, "w+");
  m_file_destroy = TRUE;
}

wxFFileOutputStream::wxFFileOutputStream(wxFFile& file)
{
  m_file = &file;
  m_file_destroy = FALSE;
}

wxFFileOutputStream::wxFFileOutputStream()
  : wxOutputStream()
{
  m_file_destroy = FALSE;
  m_file = NULL;
}

wxFFileOutputStream::wxFFileOutputStream(FILE *file)
{
  m_file = new wxFFile(file);
  m_file_destroy = TRUE;
}

wxFFileOutputStream::~wxFFileOutputStream()
{
  if (m_file_destroy) {
    Sync();
    delete m_file;
  }
}

size_t wxFFileOutputStream::OnSysWrite(const void *buffer, size_t size)
{
  size_t ret = m_file->Write(buffer, size);
  if (m_file->Error())
    m_lasterror = wxStream_WRITE_ERR;
  else
    m_lasterror = wxStream_NOERROR;
  return ret;
}

off_t wxFFileOutputStream::OnSysTell() const
{
  return m_file->Tell();
}

off_t wxFFileOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
{
  return m_file->Seek(pos, mode);
}

void wxFFileOutputStream::Sync()
{
  wxOutputStream::Sync();
  m_file->Flush();
}

size_t wxFFileOutputStream::GetSize() const
{
  return m_file->Length();
}

// ----------------------------------------------------------------------------
// wxFFileStream
// ----------------------------------------------------------------------------
wxFFileStream::wxFFileStream(const wxString& fileName)
 : wxFFileInputStream(fileName), wxFFileOutputStream(*wxFFileInputStream::m_file)
{
}
#endif
  // wxUSE_STREAMS && wxUSE_FILE