[Bugfix]Base: fix implementation of isFile() so it is safe to use

  Current implementation can freeze the app if called on specific files

src/Base/FileInfo.cpp

@@ -367,25 +367,21 @@ bool FileInfo::setPermissions(Permissions perms)
 
 bool FileInfo::isFile() const
 {
-#ifdef FC_OS_WIN32
  if (exists()) {
+#ifdef FC_OS_WIN32
+
  std::wstring wstr = toStdWString();
  FILE* fd = _wfopen(wstr.c_str(), L"rb");
  bool ok = (fd != 0);
  if (fd) fclose(fd);
  return ok;
- }
 #else
- if (exists()) {
- // If we can open it must be an existing file, otherwise we assume it
- // is a directory (which doesn't need to be true for any cases)
- std::ifstream str(FileName.c_str(), std::ios::in | std::ios::binary);
- if (!str)
+ struct stat st;
+ if(stat(FileName.c_str(), &st) != 0)
  return false;
- str.close();
- return true;
- }
+ return S_ISREG(st.st_mode);
 #endif
+ }
 
  // TODO: Check for valid file name
  return true;