Replace the GNU gzip with a slightly modified NetBSD gzip. The

NetBSD version is a feature-to-feature re-implementation of GNU
gzip using the freely-redistributable zlib and this version is
expected to be mostly bug-to-bug compatible with the GNU
implementation.

 - Because this is a piece of mature code and we want to make
   changes so it is added directly rather than importing to
   src/contrib.
 - Connect newly added code to src/usr.bin/ and rescue/rescue
   build.
 - Disconnect the GNU gzip code from build for now, they will
   be eventually removed completely.
 - Provide two new src.conf(5) knobs, WITHOUT_BZIP2_SUPPORT and
   WITHOUT_BZIP2.

Tested by:	kris (full exp-7 pointyhat build)
Approved by:	core (importing a 4-clause BSD licensed file)
Approved by:	re (adding new utility during -HEAD code slush)

1 files changed, 109 insertions, 0 deletions

diff --git a/usr.bin/gzip/zdiff.1 b/usr.bin/gzip/zdiff.1
new file mode 100644
index 0000000..2a6a4c8
--- /dev/null
+++ b/usr.bin/gzip/zdiff.1
@@ -0,0 +1,109 @@
+.\"	$NetBSD: zdiff.1,v 1.3 2003/12/28 12:48:03 wiz Exp $
+.\"	$OpenBSD: zdiff.1,v 1.2 2003/07/13 17:39:14 millert Exp $
+.\"
+.\" Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" Sponsored in part by the Defense Advanced Research Projects
+.\" Agency (DARPA) and Air Force Research Laboratory, Air Force
+.\" Materiel Command, USAF, under agreement number F39502-99-1-0512.
+.\"
+.\" $FreeBSD$
+.Dd January 26, 2007
+.Dt ZDIFF 1
+.Os
+.Sh NAME
+.Nm zcmp ,
+.Nm zdiff
+.Nd compare compressed files
+.Sh SYNOPSIS
+.Nm zcmp
+.Op Ar options
+.Ar file
+.Op Ar file2
+.Nm zdiff
+.Op Ar options
+.Ar file
+.Op Ar file2
+.Sh DESCRIPTION
+.Nm zcmp
+and
+.Nm zdiff
+are filters that invoke
+.Xr cmp 1
+or
+.Xr diff 1
+respectively to compare compressed files.
+Such files generally have a
+.Dq Z
+or
+.Dq gz
+extension (both the
+.Xr compress 1
+and
+.Xr gzip 1
+formats are supported).
+Any
+.Ar options
+that are specified are passed to
+.Xr cmp 1
+or
+.Xr diff 1 .
+.Pp
+If only
+.Ar file1
+is specified, it is compared against a file with the same name, but
+with the extension removed.
+When both
+.Ar file1
+or
+.Ar file2
+are specified, either file may be compressed.
+.Sh ENVIRONMENT
+.Bl -tag -width "TMPDIR"
+.It Ev TMPDIR
+Directory in which to place temporary files.
+If unset,
+.Pa /tmp
+is used.
+.El
+.Sh FILES
+.Bl -tag -width "/tmp/zdiff.XXXXXXXXXX" -compact
+.It Pa /tmp/zcmp.XXXXXXXXXX
+Temporary file for
+.Nm zcmp .
+.It Pa /tmp/zdiff.XXXXXXXXXX
+Temporary file for
+.Nm zdiff .
+.El
+.Sh SEE ALSO
+.Xr cmp 1 ,
+.Xr compress 1 ,
+.Xr diff 1
+.Sh CAVEATS
+.Nm zcmp
+and
+.Nm zdiff
+rely solely on the file extension to determine what is, or is not,
+a compressed file.
+Consequently, the following are not supported as arguments:
+.Bl -dash
+.It
+directories
+.It
+device special files
+.It
+filenames indicating the standard input
+.Pq Dq \-
+.El