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william |
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///////////////////////////////////////////////////////////////////////////// |
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// Name: ffile.cpp |
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// Purpose: wxFFile encapsulates "FILE *" IO stream |
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// Author: Vadim Zeitlin |
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// Modified by: |
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// Created: 14.07.99 |
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// RCS-ID: $Id: ffile.cpp 38570 2006-04-05 14:37:47Z VZ $ |
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// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr> |
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// Licence: wxWindows licence |
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///////////////////////////////////////////////////////////////////////////// |
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// ============================================================================ |
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// declarations |
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// ============================================================================ |
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// ---------------------------------------------------------------------------- |
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// headers |
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// ---------------------------------------------------------------------------- |
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// For compilers that support precompilation, includes "wx.h". |
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#include "wx/wxprec.h" |
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#ifdef __BORLANDC__ |
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#pragma hdrstop |
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#endif |
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#if wxUSE_FFILE |
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#ifndef WX_PRECOMP |
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#include "wx/intl.h" |
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#include "wx/log.h" |
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#endif |
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#ifdef __WINDOWS__ |
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#include "wx/msw/mslu.h" |
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#endif |
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#include "wx/ffile.h" |
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// ============================================================================ |
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// implementation |
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// ============================================================================ |
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// ---------------------------------------------------------------------------- |
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// seek and tell with large file support if available |
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// ---------------------------------------------------------------------------- |
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#ifdef HAVE_FSEEKO |
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# define wxFseek fseeko |
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# define wxFtell ftello |
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#else |
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# define wxFseek fseek |
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# define wxFtell ftell |
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#endif |
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// ---------------------------------------------------------------------------- |
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// opening the file |
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// ---------------------------------------------------------------------------- |
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wxFFile::wxFFile(const wxChar *filename, const wxChar *mode) |
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{ |
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Detach(); |
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(void)Open(filename, mode); |
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} |
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bool wxFFile::Open(const wxChar *filename, const wxChar *mode) |
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{ |
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wxASSERT_MSG( !m_fp, wxT("should close or detach the old file first") ); |
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m_fp = wxFopen(filename, mode); |
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if ( !m_fp ) |
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{ |
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wxLogSysError(_("can't open file '%s'"), filename); |
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return false; |
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} |
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m_name = filename; |
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return true; |
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} |
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bool wxFFile::Close() |
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{ |
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if ( IsOpened() ) |
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{ |
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if ( fclose(m_fp) != 0 ) |
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{ |
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wxLogSysError(_("can't close file '%s'"), m_name.c_str()); |
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return false; |
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} |
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Detach(); |
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} |
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return true; |
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} |
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// ---------------------------------------------------------------------------- |
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// read/write |
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// ---------------------------------------------------------------------------- |
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bool wxFFile::ReadAll(wxString *str, const wxMBConv& conv) |
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{ |
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wxCHECK_MSG( str, false, wxT("invalid parameter") ); |
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wxCHECK_MSG( IsOpened(), false, wxT("can't read from closed file") ); |
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wxCHECK_MSG( Length() >= 0, false, wxT("invalid length") ); |
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size_t length = wx_truncate_cast(size_t, Length()); |
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wxCHECK_MSG( (wxFileOffset)length == Length(), false, wxT("huge file not supported") ); |
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clearerr(m_fp); |
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wxCharBuffer buf(length + 1); |
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// note that real length may be less than file length for text files with DOS EOLs |
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// ('\r's get dropped by CRT when reading which means that we have |
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// realLen = fileLen - numOfLinesInTheFile) |
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length = fread(buf.data(), sizeof(char), length, m_fp); |
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if ( Error() ) |
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{ |
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wxLogSysError(_("Read error on file '%s'"), m_name.c_str()); |
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return false; |
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} |
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buf.data()[length] = 0; |
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*str = wxString(buf, conv); |
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return true; |
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} |
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size_t wxFFile::Read(void *pBuf, size_t nCount) |
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{ |
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wxCHECK_MSG( pBuf, 0, wxT("invalid parameter") ); |
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wxCHECK_MSG( IsOpened(), 0, wxT("can't read from closed file") ); |
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size_t nRead = fread(pBuf, 1, nCount, m_fp); |
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if ( (nRead < nCount) && Error() ) |
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{ |
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wxLogSysError(_("Read error on file '%s'"), m_name.c_str()); |
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} |
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return nRead; |
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} |
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size_t wxFFile::Write(const void *pBuf, size_t nCount) |
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{ |
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wxCHECK_MSG( pBuf, 0, wxT("invalid parameter") ); |
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wxCHECK_MSG( IsOpened(), 0, wxT("can't write to closed file") ); |
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size_t nWritten = fwrite(pBuf, 1, nCount, m_fp); |
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if ( nWritten < nCount ) |
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{ |
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wxLogSysError(_("Write error on file '%s'"), m_name.c_str()); |
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} |
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return nWritten; |
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} |
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bool wxFFile::Flush() |
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{ |
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if ( IsOpened() ) |
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{ |
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// fflush returns non-zero on error |
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// |
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if ( fflush(m_fp) ) |
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{ |
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wxLogSysError(_("failed to flush the file '%s'"), m_name.c_str()); |
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return false; |
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} |
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} |
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return true; |
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} |
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// ---------------------------------------------------------------------------- |
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// seeking |
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// ---------------------------------------------------------------------------- |
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bool wxFFile::Seek(wxFileOffset ofs, wxSeekMode mode) |
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{ |
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wxCHECK_MSG( IsOpened(), false, wxT("can't seek on closed file") ); |
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int origin; |
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switch ( mode ) |
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{ |
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default: |
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wxFAIL_MSG(wxT("unknown seek mode")); |
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// still fall through |
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case wxFromStart: |
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origin = SEEK_SET; |
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break; |
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case wxFromCurrent: |
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origin = SEEK_CUR; |
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break; |
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case wxFromEnd: |
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origin = SEEK_END; |
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break; |
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} |
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#ifndef HAVE_FSEEKO |
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if ((long)ofs != ofs) |
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{ |
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wxLogError(_("Seek error on file '%s' (large files not supported by stdio)"), m_name.c_str()); |
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return false; |
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} |
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if ( wxFseek(m_fp, (long)ofs, origin) != 0 ) |
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#else |
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if ( wxFseek(m_fp, ofs, origin) != 0 ) |
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#endif |
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{ |
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wxLogSysError(_("Seek error on file '%s'"), m_name.c_str()); |
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return false; |
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} |
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return true; |
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} |
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wxFileOffset wxFFile::Tell() const |
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{ |
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wxCHECK_MSG( IsOpened(), wxInvalidOffset, |
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_T("wxFFile::Tell(): file is closed!") ); |
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wxFileOffset rc = wxFtell(m_fp); |
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if ( rc == wxInvalidOffset ) |
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{ |
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wxLogSysError(_("Can't find current position in file '%s'"), |
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m_name.c_str()); |
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} |
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return rc; |
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} |
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wxFileOffset wxFFile::Length() const |
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{ |
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wxCHECK_MSG( IsOpened(), wxInvalidOffset, |
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_T("wxFFile::Length(): file is closed!") ); |
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wxFFile& self = *(wxFFile *)this; // const_cast |
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wxFileOffset posOld = Tell(); |
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if ( posOld != wxInvalidOffset ) |
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{ |
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if ( self.SeekEnd() ) |
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{ |
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wxFileOffset len = Tell(); |
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(void)self.Seek(posOld); |
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return len; |
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} |
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} |
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return wxInvalidOffset; |
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} |
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#endif // wxUSE_FFILE |
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