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- -*- Text -*-
-
-               Xdelta -- A binary delta generator
-
-Announcing version 1.1.2 of Xdelta.  Xdelta is an application program
-designed to compute changes between files.  These changes (deltas) are
-similar to the output of the "diff" program in that they may be used
-to store and transmit only the changes between files.  However, unlike
-diff, the output of Xdelta is not expressed in a human-readable
-format--Xdelta can also also apply these deltas to a copy of the
-original file.  Xdelta uses a fast, linear algorithm and performs well
-on both binary and text files.
-
-Xdelta 1.1.2 is a stable, maintenence release.  New, ongoing work on
-Xdelta has focused on a new storage system with features similar to
-the RCS command set.  For more information on new development, see the
-Xdelta-2.0 release series at http://xdelta.sourceforge.net.
-
-Xdelta was designed and implemented by Joshua MacDonald.  The delta
-algorithm is based on the Rsync algorithm, though implementation and
-interface considerations leave the two programs quite distinct.  The
-Rsync algorithm is due to Andrew Tridgell and Paul Mackerras.
-
-To compile and install Xdelta, read the instructions in the INSTALL
-file.  Once you have done this, you should at least read the first few
-sections of the documentation.  It is available in info format.  All
-documentation is located in the doc/ subdirectory.
-
-This release, version 1.1.2, and future releases of Xdelta can be
-found at http://xdelta.sourceforge.net.
-
-Xdelta is released under the GNU Library Public License (GPL), see the
-file COPYING for details.
-
-There is mailing list for announcements:
-
-   xdelta-announce@lists.sourceforge.net
-
-you can subscribe to the mailing list or file bug reports through
-Sourceforge at:
-
-   http://sourceforge.net/projects/xdelta/
-
-Comments about Xdelta can be addressed to the following addresses:
-
-   jmacd@cs.berkeley.edu
-
-The man page describes how to use Xdelta in more detail:
-
-NAME
-       xdelta - Invoke Xdelta
-
-SYNOPSIS
-       xdelta subcommand [ option...  ] [ operand...  ]
-
-DESCRIPTION
-
-       Xdelta provides the ability to generate deltas between a pair
-       of files and later apply those deltas.  It operates similar to
-       the diff and patch commands, but works on binary files and does
-       not produce a human readable output.
-
-       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.
-
-   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 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 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.
-
-   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.
-
-   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.
-
-   Delta
-
-       The delta subcommand has the following synopsis:
-
-       xdelta delta [ option...  ] fromfile tofile patchout
-
-       Computes a delta from fromfile to tofile and writes it to patchout
-
-   Patch
-
-       The patch subcommand has the following synopsis:
-
-       xdelta patch [ option...  ] patchin [ fromfile [ tofile ]]
-
-       Applies patchin to fromfile and produces a reconstructed
-       version of 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.
-
-   Info
-       The info subcommand has the following synopsis:
-
-       xdelta info patchinfo
-
-       Prints information about patchinfo and the version it
-       reconstructs, including file names, lengths, and MD5 checksums.
-
-   Options
-       -0..9  Set  the  zlib compression level.  Zero indicates no
-              compression.  Nine indicates maximum compression.
-
-       -h, --help
-              Print a short help message and exit.
-
-       -q, --quiet
-              Quiet.  Surpresses several warning messages.
-
-       -v, --version
-              Print the Xdelta version number and exit.
-
-       -V, --verbose
-              Verbose.  Prints a bit of extra information.
-
-       -n, --noverify
-              No verify.  Turns off MD5 checksum verification of the
-              input and output files.
-
-       -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.
-
-       -s=BLOCK_SIZE
-              Set the block size, unless it was hard coded (20% speed
-              improvement).  Should be a power of 2.
-
-       -p, --pristine
-              Disable  the  automatic  decompression of gzipped
-              inputs,  to prevent unexpected differences in the
-              re-compressed content.