<s>
Lempel	B-Language
–	I-Language
Ziv	I-Language
–	I-Language
Oberhumer	I-Language
(	O
LZO	B-Language
)	O
is	O
a	O
lossless	B-Algorithm
data	I-Algorithm
compression	I-Algorithm
algorithm	O
that	O
is	O
focused	O
on	O
decompression	O
speed	O
.	O
</s>
<s>
The	O
original	O
"	O
lzop	B-Application
"	O
implementation	O
,	O
released	O
in	O
1996	O
,	O
was	O
developed	O
by	O
Markus	O
Franz	O
Xaver	O
Johannes	O
Oberhumer	O
,	O
based	O
on	O
earlier	O
algorithms	O
by	O
Abraham	O
Lempel	O
and	O
Jacob	O
Ziv	O
.	O
</s>
<s>
The	O
LZO	B-Language
library	O
implements	O
a	O
number	O
of	O
algorithms	O
with	O
the	O
following	O
characteristics	O
:	O
</s>
<s>
LZO	B-Language
supports	O
overlapping	O
compression	O
and	O
in-place	O
decompression	O
.	O
</s>
<s>
As	O
a	O
block	B-General_Concept
compression	I-General_Concept
algorithm	O
,	O
it	O
compresses	O
and	O
decompresses	O
blocks	O
of	O
data	O
.	O
</s>
<s>
LZO	B-Language
compresses	O
a	O
block	O
of	O
data	O
into	O
matches	O
(	O
a	O
sliding	O
dictionary	O
)	O
and	O
runs	O
of	O
non-matching	O
literals	O
to	O
produce	O
good	O
results	O
on	O
highly	O
redundant	O
data	O
and	O
deals	O
acceptably	O
with	O
non-compressible	O
data	O
,	O
only	O
expanding	O
incompressible	O
data	O
by	O
a	O
maximum	O
of	O
1/64	O
of	O
the	O
original	O
size	O
when	O
measured	O
over	O
a	O
block	O
size	O
of	O
at	O
least	O
1kB	O
.	O
</s>
<s>
The	O
reference	O
implementation	O
is	O
written	O
in	O
ANSI	O
C	O
,	O
and	O
it	O
has	O
been	O
made	O
available	O
as	O
free	B-Application
software	I-Application
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
Oberhumer	O
has	O
also	O
written	O
a	O
command-line	O
frontend	O
called	O
lzop	B-Application
.	O
</s>
<s>
Versions	O
of	O
LZO	B-Language
are	O
available	O
for	O
the	O
Perl	B-Language
,	O
Python	B-Language
and	O
Java	B-Language
languages	I-Language
.	O
</s>
<s>
Various	O
LZO	B-Language
implementations	O
are	O
reported	O
to	O
work	O
under	O
Win32	B-Library
,	O
AIX	B-Application
,	O
ConvexOS	O
,	O
IRIX	B-Operating_System
,	O
Mac	B-Application
OS	I-Application
,	O
Palm	B-Operating_System
OS	I-Operating_System
,	O
PlayStation	B-Device
,	O
Nintendo	B-Operating_System
64	I-Operating_System
,	O
Wii	B-Operating_System
,	O
Solaris	B-Application
,	O
SunOS	B-Operating_System
,	O
TOS	B-Application
(	O
Atari	O
ST	O
)	O
,	O
Linux	B-Application
and	O
VxWorks	B-Operating_System
.	O
</s>
<s>
FFmpeg	O
's	O
libavutil	O
library	O
includes	O
its	O
own	O
implementation	O
of	O
LZO	B-Language
as	O
a	O
possible	O
method	O
for	O
lossless	B-Algorithm
video	O
compression	O
.	O
</s>
<s>
FFmpeg	O
's	O
implementation	O
of	O
the	O
decompressor	O
is	O
also	O
used	O
in	O
OpenConnect	B-Application
in	O
order	O
to	O
support	O
LZO-compressed	O
ESP	O
packets	O
sent	O
by	O
Juniper	O
Networks	O
and	O
Pulse	B-Protocol
Secure	I-Protocol
VPN	O
servers	O
.	O
</s>
<s>
The	O
Linux	B-Application
kernel	O
uses	O
its	O
LZO	B-Language
implementation	O
in	O
some	O
of	O
its	O
features	O
:	O
</s>
<s>
btrfs	B-Operating_System
uses	O
LZO	B-Language
as	O
a	O
possible	O
compression	O
method	O
for	O
file	B-Application
system	I-Application
compression	O
.	O
</s>
<s>
initrd	B-Application
and	I-Application
initramfs	I-Application
use	O
LZO	B-Language
as	O
a	O
possible	O
compression	O
method	O
for	O
initial	O
RAM	B-Application
drive	I-Application
compression	O
.	O
</s>
<s>
SquashFS	B-Application
uses	O
LZO	B-Language
as	O
a	O
possible	O
compression	O
method	O
for	O
file	B-Application
system	I-Application
compression	O
.	O
</s>
<s>
zram	B-Application
uses	O
LZO	B-Language
with	O
run-length	B-Algorithm
encoding	I-Algorithm
called	O
LZO-RLE	B-Language
as	O
the	O
default	O
compression	O
method	O
for	O
RAM	B-Application
drive	I-Application
compression	O
.	O
</s>
