This table corresponding to the first 128 chars in ascii table.If the char is not one of "qpzry9x8gf2tvdw0s3jn54khce6mua7l" which is the code table of base32(Only consists of alphanumeric characters excluding "1", "b", "i", and "o"), -1 will be set in the corresponding position.Otherwise, the sequence number of alphanumeric character will be set.