nl_tokens: Read keyword summary at the begining of keyword section .
pl_tokens: function read_keyword_summary ( input , offset ) { var scanner = Scanner ( input ) ; scanner . forward ( offset ) ; return { num_blocks : scanner . readNum ( ) , num_entries : scanner . readNum ( ) , key_index_decomp_len : _v2 && scanner . readNum ( ) , // Ver >= 2.0 only key_index_comp_len : scanner . readNum ( ) , key_blocks_len : scanner . readNum ( ) , chksum : scanner . checksum_v2 ( ) , // extra field len : scanner . offset ( ) - <mask> , // actual length of keyword section, varying with engine version attribute } ; }