gzip_trees.c, set_file_type
gzip_trees.c, init_block
gzip_trees.c, build_tree
gzip_trees.c, send_tree
gzip_trees.c, build_bl_tree
gzip_trees.c, send_all_trees
gzip_trees.c, flush_block
gzip_trees.c, ct_init
gzip_trees.c, pqdownheap
gzip_trees.c, gen_bitlen
gzip_trees.c, gen_codes
gzip_trees.c, ct_tally
gzip_trees.c, scan_tree
gzip_trees.c, compress_block
