Fixed some potential buffer overruns

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

diff --git a/src/common/ffile.cpp b/src/common/ffile.cpp
index 503e5bfa0d886350b3109fc2386bcac90209a2a6..a208dacb3ec124536650a4eb82e72f79bd796045 100644 (file)
--- a/src/common/ffile.cpp
+++ b/src/common/ffile.cpp
@@ -41,6 +41,18 @@
 // implementation
 // ============================================================================
 
+// ----------------------------------------------------------------------------
+// seek and tell with large file support if available
+// ----------------------------------------------------------------------------
+
+#ifdef HAVE_FSEEKO
+#   define wxFseek fseeko
+#   define wxFtell ftello
+#else
+#   define wxFseek fseek
+#   define wxFtell ftell
+#endif
+
 // ----------------------------------------------------------------------------
 // opening the file
 // ----------------------------------------------------------------------------
@@ -62,12 +74,12 @@ bool wxFFile::Open(const wxChar *filename, const wxChar *mode)
     {
         wxLogSysError(_("can't open file '%s'"), filename);
 
-        return FALSE;
+        return false;
     }
 
     m_name = filename;
 
-    return TRUE;
+    return true;
 }
 
 bool wxFFile::Close()
@@ -78,13 +90,13 @@ bool wxFFile::Close()
         {
             wxLogSysError(_("can't close file '%s'"), m_name.c_str());
 
-            return FALSE;
+            return false;
         }
 
         Detach();
     }
 
-    return TRUE;
+    return true;
 }
 
 // ----------------------------------------------------------------------------
@@ -93,8 +105,8 @@ bool wxFFile::Close()
 
 bool wxFFile::ReadAll(wxString *str)
 {
-    wxCHECK_MSG( str, FALSE, wxT("invalid parameter") );
-    wxCHECK_MSG( IsOpened(), FALSE, wxT("can't read from closed file") );
+    wxCHECK_MSG( str, false, wxT("invalid parameter") );
+    wxCHECK_MSG( IsOpened(), false, wxT("can't read from closed file") );
 
     clearerr(m_fp);
 
@@ -110,7 +122,7 @@ bool wxFFile::ReadAll(wxString *str)
         {
             wxLogSysError(_("Read error on file '%s'"), m_name.c_str());
 
-            return FALSE;
+            return false;
         }
         //else: just EOF
 
@@ -118,7 +130,7 @@ bool wxFFile::ReadAll(wxString *str)
         *str += buf;
     }
 
-    return TRUE;
+    return true;
 }
 
 size_t wxFFile::Read(void *pBuf, size_t nCount)
@@ -159,20 +171,20 @@ bool wxFFile::Flush()
         {
             wxLogSysError(_("failed to flush the file '%s'"), m_name.c_str());
 
-            return FALSE;
+            return false;
         }
     }
 
-    return TRUE;
+    return true;
 }
 
 // ----------------------------------------------------------------------------
 // seeking
 // ----------------------------------------------------------------------------
 
-bool wxFFile::Seek(long ofs, wxSeekMode mode)
+bool wxFFile::Seek(wxFileOffset ofs, wxSeekMode mode)
 {
-    wxCHECK_MSG( IsOpened(), FALSE, wxT("can't seek on closed file") );
+    wxCHECK_MSG( IsOpened(), false, wxT("can't seek on closed file") );
 
     int origin;
     switch ( mode )
@@ -194,44 +206,53 @@ bool wxFFile::Seek(long ofs, wxSeekMode mode)
             break;
     }
 
-    if ( fseek(m_fp, ofs, origin) != 0 )
+#ifndef HAVE_FSEEKO 
+    if ((long)ofs != ofs)
+    {
+        wxLogError(_("Seek error on file '%s' (large files not supported by stdio)"), m_name.c_str());
+
+        return false;
+    }
+#endif
+
+    if ( wxFseek(m_fp, ofs, origin) != 0 )
     {
         wxLogSysError(_("Seek error on file '%s'"), m_name.c_str());
 
-        return FALSE;
+        return false;
     }
 
-    return TRUE;
+    return true;
 }
 
-size_t wxFFile::Tell() const
+wxFileOffset wxFFile::Tell() const
 {
-    wxCHECK_MSG( IsOpened(), (size_t)-1,
+    wxCHECK_MSG( IsOpened(), wxInvalidOffset,
                  _T("wxFFile::Tell(): file is closed!") );
 
-    long rc = ftell(m_fp);
-    if ( rc == -1 )
+    wxFileOffset rc = wxFtell(m_fp);
+    if ( rc == wxInvalidOffset )
     {
         wxLogSysError(_("Can't find current position in file '%s'"),
                       m_name.c_str());
     }
 
-    return (size_t)rc;
+    return rc;
 }
 
-size_t wxFFile::Length() const
+wxFileOffset wxFFile::Length() const
 {
-    wxCHECK_MSG( IsOpened(), (size_t)-1,
+    wxCHECK_MSG( IsOpened(), wxInvalidOffset,
                  _T("wxFFile::Length(): file is closed!") );
 
     wxFFile& self = *(wxFFile *)this;   // const_cast
 
-    size_t posOld = Tell();
-    if ( posOld != (size_t)-1 )
+    wxFileOffset posOld = Tell();
+    if ( posOld != wxInvalidOffset )
     {
         if ( self.SeekEnd() )
         {
-            size_t len = Tell();
+            wxFileOffset len = Tell();
 
             (void)self.Seek(posOld);
 
@@ -239,7 +260,7 @@ size_t wxFFile::Length() const
         }
     }
 
-    return (size_t)-1;
+    return wxInvalidOffset; 
 }
 
 #endif // wxUSE_FFILE