escPath += "/";
escPath += '/';
net_GetURLSpecFromFile(nsIFile *aFile, nsACString &result){  // NOTE: This is identical to the implementation in nsURLHelperUnix.cpp    nsresult rv;  nsCAutoString ePath;  // construct URL spec from native file path  rv = aFile->GetNativePath(ePath);  if (NS_FAILED(rv))    return rv;  nsCAutoString escPath;  NS_NAMED_LITERAL_CSTRING(prefix, "file://");        // Escape the path with the directory mask  if (NS_EscapeURL(ePath.get(), ePath.Length(), esc_Directory+esc_Forced, escPath))    escPath.Insert(prefix, 0);  else    escPath.Assign(prefix + ePath);  // esc_Directory does not escape the semicolons, so if a filename   // contains semicolons we need to manually escape them.  escPath.ReplaceSubstring(";", "%3b");  // if this file references a directory, then we need to ensure that the  // URL ends with a slash.  this is important since it affects the rules  // for relative URL resolution when this URL is used as a base URL.  // if the file does not exist, then we make no assumption about its type,  // and simply leave the URL unmodified.  if (escPath.Last() != '/') {    PRBool dir;    rv = aFile->IsDirectory(&dir);    if (NS_SUCCEEDED(rv) && dir)      escPath += "/";  }    result = escPath;  return NS_OK;}