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-.ds p \&\s-1Xdelta\s0
-.if n .ds - \%--
-.if t .ds - \(em
-.if !\n(.g \{\
-.       if !\w|\*(lq| \{\
-.               ds lq ``
-.               if \w'\(lq' .ds lq "\(lq
-.       \}
-.       if !\w|\*(rq| \{\
-.               ds rq ''
-.               if \w'\(rq' .ds rq "\(rq
-.       \}
-.\}
-.de PE
-.sp \\n()Pu
-.ne 2
-.nf
-.IP
-..
-.de EP
-.fi
-.PP
-.sp \\n()Pu
-..
-.TH Xdelta 1
-.SH NAME
-xdelta \- Invoke Xdelta
-.SH SYNOPSIS
-.B xdelta
-.I subcommand
-[
-.IR option ".\|.\|.
-] [
-.IR operand .\|.\|.
-]
-.SH DESCRIPTION
-Xdelta provides the ability to generate deltas between a pair of files
-and later apply those deltas.  It operates similar to the
-.B diff
-and
-.B patch
-commands, but works on binary files and does not produce a human
-readable output.
-.PP
-
-Xdelta has three subcommands, delta, patch, and info.  Delta accepts
-two file versions and produces a delta, while patch accepts the
-original file version and delta and produces the second version.  The
-info command prints useful information about a delta.  Each subcommand
-will be detailed seperately.
-
-.SS Gzip processing
-Attempting to compute a delta between compressed input files usually
-results in poor compression.  This is because small differences
-between the original contents causes changes in the compression of
-whole blocks of data.  To simplify things, Xdelta implements a special
-case for
-.IR gzip (1)
-compressed files.  If any version input to the delta command is
-recognized as having gzip compression, it will be automatically
-decompressed into a temporary location prior to comparison.  This
-temporary location is either the value of the
-.IR TMPDIR
-environment variable, if set, otherwise "/tmp".
-
-The Xdelta patch header contains a flag indicating that the
-reconstructed version should be recompressed after applying the
-patch.  In general, this allows Xdelta to operate transparently on
-gzip compressed inputs.
-
-There is one potential problem when automatically processing gzip
-compressed files, which is that the recompressed content does not
-always match byte-for-byte with the original compressed content.  The
-uncompressed content still matches, but if there is an external
-integrity check such as cryptographic signature verification, it may
-fail.  To prevent this from happening, the --pristine option disables
-automatic gzip processing.
-
-.SS MD5 integrity check
-By default, Xdelta always verifies the MD5 checksum of the files it
-reconstructs.  This prevents you from supplying an incorrect input
-during patch, which would result in corrupt output.  Because of this
-feature, you can feel confident that patch has produced valid results.
-The --noverify option disables MD5 verification, but this is only
-recommended for performance testing.
-
-.SS Compressed patch format
-Xdelta uses a fairly simple encoding for its delta, then applies zlib
-compression to the result.  You should not have to post-compress an
-Xdelta delta.
-
-.SS Delta
-The delta subcommand has the following synopsis:
-
-.B xdelta
-.I delta
-[
-.IR option ".\|.\|.
-]
-.IR fromfile
-.IR tofile
-.IR patchout
-
-Computes a delta from
-.IR fromfile
-to
-.IR tofile
-and writes it to
-.IR patchout
-
-.SS Patch
-The patch subcommand has the following synopsis:
-
-.B xdelta
-.I patch
-[
-.IR option ".\|.\|.
-]
-.IR patchin
-[
-.IR fromfile
-[
-.IR tofile
-]]
-
-Applies
-.IR patchin
-to
-.IR fromfile
-and produces a reconstructed version of
-.IR tofile.
-
-If fromfile was omitted, Xdelta attempts to use the original fromfile
-name, which is stored in the delta.  The from file must be identical
-to the one used to create the delta.  If its length or MD5 checksum
-differs, patch will abort with an error message.
-
-If tofile was omitted, Xdelta attempts to use the original tofile
-name, which is also stored in the delta.  If the original tofile name
-already exists, a unique filename extension will be added to avoid
-destroying any existing data.
-
-.SS Info
-The info subcommand has the following synopsis:
-
-.B xdelta
-.I info
-.IR patchinfo
-
-Prints information about
-.IR patchinfo
-and the version it reconstructs, including file names, lengths, and
-MD5 checksums.
-
-.SS Options
-
-.IP -0..9
-Set the zlib compression level.  Zero indicates no compression.  Nine
-indicates maximum compression.
-
-.IP "-h, --help"
-Print a short help message and exit.
-
-.IP "-q, --quiet"
-Quiet.  Surpresses several warning messages.
-
-.IP "-v, --version"
-Print the Xdelta version number and exit.
-
-.IP "-V, --verbose"
-Verbose.  Prints a bit of extra information.
-
-.IP "-n, --noverify"
-No verify.  Turns off MD5 checksum verification of the input and
-output files.
-
-.IP "-m=SIZE, --maxmem=SIZE"
-Set an upper bound on the size of an in-memory page cache.  For
-example, --maxmem=32M will use a 32 megabyte page cache.
-
-.IP "-s=BLOCK_SIZE"
-Set the block size, unless it was hard coded (20% speed improvement).
-Should be a power of 2.
-
-.IP "-p, --pristine"
-Disable the automatic decompression of gzipped inputs, to prevent
-unexpected differences in the re-compressed content.
-
-.SH RETURN VALUES
-The delta command exits with status 0 to indicate that no differences
-were found, with status 1 to indicate that some differences were
-found, and with status 2 to indicate an error of some kind.  The patch
-and info commands exit with status 0 on success and 2 on failure.
-
-.SH IDENTIFICATION
-Author: Joshua P. MacDonald, jmacd@cs.berkeley.edu
-.br
-.\" $Format: "Manual Page Revision: $Revision$; Release Date: $ProjectDate$."$
-Manual Page Revision: 1.6; Release Date: Sun, 28 Jan 2007 10:02:26 -0800.
-.br
-Copyright \(co 1997, 1998, 1999, 2000, 2001