private static bool IsValidWindowsNameCore( Substring fileName )
{
Substring trimmedFileName = fileName.TrimEnd();
// may not end in period on windows
// (even if period is followed by whitespaces)
if( trimmedFileName[fileName.Length - 1] == '.' )
return false;
// current and parent directory names
// the step above accounts for this
/*if( trimmedFileName.Equals(".", CompareOptions.Ordinal)
|| trimmedFileName.Equals("..", CompareOptions.Ordinal) )
return false;*/
// DOS device names, in any character case
foreach( var dosDevName in DosDeviceNames )
{
if( fileName.Equals(dosDevName, CompareOptions.OrdinalIgnoreCase) )
return false;
}
// DOS device names plus any extension
int extensionAt = fileName.LastIndexOf('.'); // this would not be OK, if we were checking file paths, instead of file names!
if( extensionAt != -1 )
{
fileName = fileName.Substr(startIndex: 0, length: extensionAt);
foreach( var dosDevName in DosDeviceNames )
{
if( fileName.Equals(dosDevName, CompareOptions.OrdinalIgnoreCase) )
return false;
}
}
return true;
}
private Substring FromCsvString( Substring substr )
{
if( substr.Length == 0
|| substr.Equals("\"\"", CompareOptions.Ordinal, CultureInfo.InvariantCulture) )
return Substring.Empty;
if( substr[0] == '"'
&& substr[substr.Length - 1] == '"' )
return substr.Substr(1, substr.Length - 2).ToString().Replace("\"\"", "\"");
else
return substr;
}
