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1.\" ----------------------------------------------------------------------------
2.\" "THE BEER-WARE LICENSE" (Revision 42):
3.\" <sobomax@FreeBSD.ORG> wrote this file. As long as you retain this notice you
4.\" can do whatever you want with this stuff. If we meet some day, and you think
5.\" this stuff is worth it, you can buy me a beer in return. Maxim Sobolev
6.\" ----------------------------------------------------------------------------
7.\"
8.\" $FreeBSD: head/usr.bin/mkuzip/mkuzip.8 156818 2006-03-17 20:48:10Z sobomax $
9.\"
10.Dd September 10, 2004
11.Dt MKUZIP 8
12.Os
13.Sh NAME
14.Nm mkuzip
15.Nd compress disk image for use with
16.Xr geom_uzip 4
17class
18.Sh SYNOPSIS

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25The
26.Nm
27utility compresses a disk image file so that the
28.Xr geom_uzip 4
29class will be able to decompress the resulting image at run-time.
30This allows for a significant reduction of size of disk image at
31the expense of some CPU time required to decompress the data each
32time it is read.
33.Nm
34works in two phases:
35.Bl -enum
36.It
37An
38.Ar infile
39image is split into clusters; each cluster is compressed using
40.Xr zlib 3 .
41.It

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69are only 1-2% less than those achieved with
70.Xr gzip 1 .
71However, it should be kept in mind that larger cluster
72sizes lead to higher overhead in the
73.Xr geom_uzip 4
74class, as the class has to decompress the whole cluster even if
75only a few bytes from that cluster have to be read.
76.Pp
77.Nm
78inserts a short shell script at the beginning of the generated image,
79which makes it possible to
80.Dq run
81the image just like any other shell script.
82The script tries to load the
83.Xr geom_uzip 4
84class if it is not loaded, configure the image as an
85.Xr md 4

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