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ffile.cpp
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C/C++ Source or Header
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2001-06-26
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254 lines
/////////////////////////////////////////////////////////////////////////////
// Name: ffile.cpp
// Purpose: wxFFile - encapsulates "FILE *" IO stream
// Author: Vadim Zeitlin
// Modified by:
// Created: 14.07.99
// RCS-ID: $Id: ffile.cpp,v 1.11 2001/06/26 20:59:09 VZ Exp $
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "ffile.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_FFILE
#ifndef WX_PRECOMP
#include "wx/intl.h"
#include "wx/log.h"
#endif
#include "wx/ffile.h"
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// opening the file
// ----------------------------------------------------------------------------
wxFFile::wxFFile(const wxChar *filename, const char *mode)
{
Detach();
(void)Open(filename, mode);
}
bool wxFFile::Open(const wxChar *filename, const char *mode)
{
wxASSERT_MSG( !m_fp, wxT("should close or detach the old file first") );
#if wxUSE_UNICODE
char *tmp_fname;
size_t fname_len;
fname_len = wxStrlen(filename)+1;
tmp_fname = new char[fname_len];
wxWX2MB(tmp_fname, filename, fname_len);
m_fp = fopen(tmp_fname, mode);
delete tmp_fname;
#else
m_fp = fopen(filename, mode);
#endif
if ( !m_fp )
{
wxLogSysError(_("can't open file '%s'"), filename);
return FALSE;
}
m_name = filename;
return TRUE;
}
bool wxFFile::Close()
{
if ( IsOpened() )
{
if ( fclose(m_fp) != 0 )
{
wxLogSysError(_("can't close file '%s'"), m_name.c_str());
return FALSE;
}
Detach();
}
return TRUE;
}
// ----------------------------------------------------------------------------
// read/write
// ----------------------------------------------------------------------------
bool wxFFile::ReadAll(wxString *str)
{
wxCHECK_MSG( str, FALSE, wxT("invalid parameter") );
wxCHECK_MSG( IsOpened(), FALSE, wxT("can't read from closed file") );
clearerr(m_fp);
str->Empty();
str->Alloc(Length());
wxChar buf[1024];
static const size_t nSize = WXSIZEOF(buf) - 1; // -1 for trailing '\0'
while ( !Eof() )
{
size_t nRead = fread(buf, sizeof(wxChar), nSize, m_fp);
if ( (nRead < nSize) && Error() )
{
wxLogSysError(_("Read error on file '%s'"), m_name.c_str());
return FALSE;
}
//else: just EOF
buf[nRead] = 0;
*str += buf;
}
return TRUE;
}
size_t wxFFile::Read(void *pBuf, size_t nCount)
{
wxCHECK_MSG( pBuf, FALSE, wxT("invalid parameter") );
wxCHECK_MSG( IsOpened(), FALSE, wxT("can't read from closed file") );
size_t nRead = fread(pBuf, 1, nCount, m_fp);
if ( (nRead < nCount) && Error() )
{
wxLogSysError(_("Read error on file '%s'"), m_name.c_str());
}
return nRead;
}
size_t wxFFile::Write(const void *pBuf, size_t nCount)
{
wxCHECK_MSG( pBuf, FALSE, wxT("invalid parameter") );
wxCHECK_MSG( IsOpened(), FALSE, wxT("can't write to closed file") );
size_t nWritten = fwrite(pBuf, 1, nCount, m_fp);
if ( nWritten < nCount )
{
wxLogSysError(_("Write error on file '%s'"), m_name.c_str());
}
return nWritten;
}
bool wxFFile::Flush()
{
if ( IsOpened() )
{
// fflush returns non-zero on error
//
if ( fflush(m_fp) )
{
wxLogSysError(_("failed to flush the file '%s'"), m_name.c_str());
return FALSE;
}
}
return TRUE;
}
// ----------------------------------------------------------------------------
// seeking
// ----------------------------------------------------------------------------
bool wxFFile::Seek(long ofs, wxSeekMode mode)
{
wxCHECK_MSG( IsOpened(), FALSE, wxT("can't seek on closed file") );
int origin;
switch ( mode )
{
default:
wxFAIL_MSG(wxT("unknown seek mode"));
// still fall through
case wxFromStart:
origin = SEEK_SET;
break;
case wxFromCurrent:
origin = SEEK_CUR;
break;
case wxFromEnd:
origin = SEEK_END;
break;
}
if ( fseek(m_fp, ofs, origin) != 0 )
{
wxLogSysError(_("Seek error on file '%s'"), m_name.c_str());
return FALSE;
}
return TRUE;
}
size_t wxFFile::Tell() const
{
long rc = ftell(m_fp);
if ( rc == -1 )
{
wxLogSysError(_("Can't find current position in file '%s'"),
m_name.c_str());
}
return (size_t)rc;
}
size_t wxFFile::Length() const
{
wxFFile& self = *(wxFFile *)this; // const_cast
size_t posOld = Tell();
if ( posOld != (size_t)-1 )
{
if ( self.SeekEnd() )
{
size_t len = Tell();
(void)self.Seek(posOld);
return len;
}
}
return (size_t)-1;
}
#endif // wxUSE_FFILE