Unescaping routine, but does not check that the string is
      an URI. The output is a direct unsigned char translation of
      %XX values (no encoding) Note that the length of the result
       can only be smaller or same size as the input string.

def URIUnescapeString(str, len, target):
    """Unescaping routine, but does not check that the string is
      an URI. The output is a direct unsigned char translation of
      %XX values (no encoding) Note that the length of the result
       can only be smaller or same size as the input string. """
    ret = libxml2mod.xmlURIUnescapeString(str, len, target)
    return ret