[RFC] Compression function for GTAGS

[Shigio YAMAGUCHI]

Hi all,
I have added new compression function to the CVS version of GLOBAL.
You can see the implementation in libutil/compress.c.

You can use the function by specifying -cccc option (four 'c').

        $ gtags -cccc

Here is a result when applying to Linux-2.6 source code.

type            command line    size of GTAGS   elapsed time
------------------------------------------------------------
standard        gtags           98959360(100%)  44:56
compact         gtags -c        39788544(40%)   14:05
pathindex       gtags -cc       80715776(82%)   31:47
new             gtags -ccc      77430784(78%)   15:22
new+compress    gtags -cccc     63782912(64%)   15:51
------------------------------------------------------------

Could you assess the new function?
If there is no problem, I would like to adopt it for the next
version of GLOBAL.

Thank you in advance.
--
Shigio YAMAGUCHI <address@hidden> - Tama Communications Corporation
PGP fingerprint: D1CB 0B89 B346 4AB6 5663  C4B6 3CA5 BBB3 57BE DDA3