Decode string with % encoding.
This method makes the assumption that the majority of calls
will need no decoding.
@param encoded the encoded string to decode
@param offset the offset in the encoded string to decode from
@param length the length of characters in the encoded string to decode
@param charset the charset to use for decoding
@return the decoded string
Decode string with % encoding. This method makes the assumption that the majority of calls will need no decoding.
@param encoded the encoded string to decode @param offset the offset in the encoded string to decode from @param length the length of characters in the encoded string to decode @param charset the charset to use for decoding @return the decoded string