* read_code_lens() function and built using the make_decode_table() function.
* The decode table is not a real tree but rather a table that we can index by
* some number of bits (*_TABLEBITS) of the input to quickly look up the symbol
* read_code_lens() function and built using the make_decode_table() function.
* The decode table is not a real tree but rather a table that we can index by
* some number of bits (*_TABLEBITS) of the input to quickly look up the symbol