[PATCH 2/2] (g)unzip: Optimize inflate_codes()

[Loïc Grenié]

2010/2/18 Dan Fandrich <dan at coneharvesters.com>:
> On Wed, Feb 17, 2010 at 03:27:10PM -0600, Rob Landley wrote:
>> On ubuntu 9.10 for x86-64, /lib/libz.so.1.2.3.3 is 96,768 bytes (stripped).  I
>> just built busybox with both gzip and gunzip, and it was 30,824 bytes.  Our
>> version, both compression and decompresson, is less than 1/3 the size of the
>> basic zlib library that comes with the system.  (And yes both files are
>> stripped according to the "file" command.)
>>
>> You too could have checked this.
>
> I just hacked busybox to use zlib (dynamically linked) instead of its internal
> compression/decompression routines and got this out of bloatcheck:
>
> (add/remove: 0/38 grow/shrink: 1/4 up/down: 67/-11449)     Total: -11382 bytes
>  text    data     bss     dec     hex filename
>  812761    2444    9288  824493   c94ad busybox_old
>  802011    2464    9288  813763   c6ac3 busybox_unstripped
>
> So, if you have zlib on disk already due to some other application's
> dependency, BusyBox contains over 11KB of bloat.

   In many uses of BB (embedded, ramdisk), zlib is not already on disk.

       Loïc