src/common/ffile.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        ffile.cpp
   3 // Purpose:     wxFFile - encapsulates "FILE *" IO stream
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     14.07.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "ffile.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28   #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_FILE
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/intl.h"
  35     #include "wx/log.h"
  36 #endif
  37
  38 #include "wx/ffile.h"
  39
  40 // ============================================================================
  41 // implementation
  42 // ============================================================================
  43
  44 // ----------------------------------------------------------------------------
  45 // opening the file
  46 // ----------------------------------------------------------------------------
  47
  48 wxFFile::wxFFile(const wxChar *filename, const char *mode)
  49 {
  50     Detach();
  51
  52     (void)Open(filename, mode);
  53 }
  54
  55 bool wxFFile::Open(const wxChar *filename, const char *mode)
  56 {
  57     wxASSERT_MSG( !m_fp, _T("should close or detach the old file first") );
  58
  59     m_fp = fopen(filename, mode);
  60
  61     if ( !m_fp )
  62     {
  63         wxLogSysError(_("can't open file '%s'"), filename);
  64
  65         return FALSE;
  66     }
  67
  68     m_name = filename;
  69
  70     return TRUE;
  71 }
  72
  73 bool wxFFile::Close()
  74 {
  75     if ( IsOpened() )
  76     {
  77         if ( fclose(m_fp) != 0 )
  78         {
  79             wxLogSysError(_("can't close file '%s'"), m_name.c_str());
  80
  81             return FALSE;
  82         }
  83
  84         Detach();
  85     }
  86
  87     return TRUE;
  88 }
  89
  90 // ----------------------------------------------------------------------------
  91 // read/write
  92 // ----------------------------------------------------------------------------
  93
  94 bool wxFFile::ReadAll(wxString *str)
  95 {
  96     wxCHECK_MSG( str, FALSE, _T("invalid parameter") );
  97     wxCHECK_MSG( IsOpened(), FALSE, _T("can't read from closed file") );
  98
  99     clearerr(m_fp);
 100
 101     str->Empty();
 102     str->Alloc(Length());
 103
 104     wxChar buf[1024];
 105     static const size_t nSize = WXSIZEOF(buf) - 1; // -1 for trailing '\0'
 106     while ( !Eof() )
 107     {
 108         size_t nRead = fread(buf, sizeof(wxChar), nSize, m_fp);
 109         if ( (nRead < nSize) && Error() )
 110         {
 111             wxLogSysError(_("Read error on file '%s'"), m_name.c_str());
 112
 113             return FALSE;
 114         }
 115         //else: just EOF
 116
 117         buf[nRead] = 0;
 118         *str += buf;
 119     }
 120
 121     return TRUE;
 122 }
 123
 124 size_t wxFFile::Read(void *pBuf, size_t nCount)
 125 {
 126     wxCHECK_MSG( pBuf, FALSE, _T("invalid parameter") );
 127     wxCHECK_MSG( IsOpened(), FALSE, _T("can't read from closed file") );
 128
 129     size_t nRead = fread(pBuf, 1, nCount, m_fp);
 130     if ( (nRead < nCount) && Error() )
 131     {
 132         wxLogSysError(_("Read error on file '%s'"), m_name.c_str());
 133     }
 134
 135     return nRead;
 136 }
 137
 138 size_t wxFFile::Write(const void *pBuf, size_t nCount)
 139 {
 140     wxCHECK_MSG( pBuf, FALSE, _T("invalid parameter") );
 141     wxCHECK_MSG( IsOpened(), FALSE, _T("can't write to closed file") );
 142
 143     size_t nWritten = fwrite(pBuf, 1, nCount, m_fp);
 144     if ( nWritten < nCount )
 145     {
 146         wxLogSysError(_("Write error on file '%s'"), m_name.c_str());
 147     }
 148
 149     return nWritten;
 150 }
 151
 152 bool wxFFile::Flush()
 153 {
 154     if ( IsOpened() )
 155     {
 156         if ( !fflush(m_fp) )
 157         {
 158             wxLogSysError(_("failed to flush the file '%s'"), m_name.c_str());
 159
 160             return FALSE;
 161         }
 162     }
 163
 164     return TRUE;
 165 }
 166
 167 // ----------------------------------------------------------------------------
 168 // seeking
 169 // ----------------------------------------------------------------------------
 170
 171 bool wxFFile::Seek(long ofs, wxSeekMode mode)
 172 {
 173     wxCHECK_MSG( IsOpened(), FALSE, _T("can't seek on closed file") );
 174
 175     int origin;
 176     switch ( mode )
 177     {
 178         default:
 179             wxFAIL_MSG(_T("unknown seek mode"));
 180             // still fall through
 181
 182         case wxFromStart:
 183             origin = SEEK_SET;
 184             break;
 185
 186         case wxFromCurrent:
 187             origin = SEEK_CUR;
 188             break;
 189
 190         case wxFromEnd:
 191             origin = SEEK_END;
 192             break;
 193     }
 194
 195     if ( fseek(m_fp, ofs, origin) != 0 )
 196     {
 197         wxLogSysError(_("Seek error on file '%s'"), m_name.c_str());
 198
 199         return FALSE;
 200     }
 201
 202     return TRUE;
 203 }
 204
 205 size_t wxFFile::Tell() const
 206 {
 207     long rc = ftell(m_fp);
 208     if ( rc == -1 )
 209     {
 210         wxLogSysError(_("Can't find current position in file '%s'"),
 211                       m_name.c_str());
 212     }
 213
 214     return (size_t)rc;
 215 }
 216
 217 size_t wxFFile::Length() const
 218 {
 219     wxFFile& self = *(wxFFile *)this;   // const_cast
 220
 221     size_t posOld = Tell();
 222     if ( posOld != (size_t)-1 )
 223     {
 224         if ( self.SeekEnd() )
 225         {
 226             size_t len = Tell();
 227
 228             (void)self.Seek(posOld);
 229
 230             return len;
 231         }
 232     }
 233
 234     return (size_t)-1;
 235 }
 236
 237 #endif // wxUSE_FILE