* src/header.c (skip_bytes): newly added.

* src/header.c (skip_bytes): newly added.
(dump_get_byte): newly added for dumpimp the data for debugging.
(dump_skip_bytes): ditto.
(get_word): ditto.
(get_longword): ditto.
(get_bytes): ditto.
(get_extended_header): modified for reading the level 3 header.
(get_header_level3): newly added.

* src/lha.h (struct LzHeader): for level 3 header, added a new
member `size_field_length' and changed type of the `header_size'
from int to long.

git-svn-id: svn+ssh://svn.sourceforge.jp/svnroot/lha/lha/trunk@446 6a8cc165-1e22-0410-a132-eb4e3f353aba