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+.TH XDELTA3 "1" "August 2009" "Xdelta3"
+.SH NAME
+xdelta3 \- VCDIFF (RFC 3284) binary diff tool
+.SH SYNOPSIS
+.B xdelta3 
+.RI [ command ]
+.RI [ options ] 
+.RI [ input 
+.RI [ output ]]
+.SH DESCRIPTION
+.B xdelta3
+is a binary diff tool that uses the VCDIFF (RFC 3284) format and compression.
+.SH COMMANDS
+.TP
+.BI config
+prints xdelta3 configuration
+.TP
+.BI decode
+decompress the input, also set by -d
+.TP
+.BI encode
+compress the input, also set by -e (default)
+.TP
+.BI test
+run the builtin tests
+.TP
+.BI printdelta
+print information about the entire delta
+.TP
+.BI printhdr
+print information about the first window
+.TP
+.BI printhdrs
+print information about all windows
+.TP
+.BI recode
+encode with new application/secondary settings
+
+.SH OPTIONS
+standard options:
+.TP
+.BI "\-0 .. \-9"
+compression level
+.TP
+.BI "\-c"
+use stdout
+.TP
+.BI "\-d"
+decompress
+.TP
+.BI \-e
+compress
+.TP
+.BI \-f
+force overwrite
+.TP
+.BI \-h
+show help
+.TP
+.BI \-q
+be quiet
+.TP
+.BI \-v
+be verbose (max 2)
+.TP
+.BI \-V
+show version
+
+.TP
+memory options:
+.TP
+.BI \-B 
+.RI bytes
+source window size
+.TP
+.BI \-W 
+.RI bytes
+input window size
+.TP
+.BI \-P 
+.RI size
+compression duplicates window
+.TP
+.BI \-I 
+.RI size
+instruction buffer size (0 = unlimited)
+
+.TP
+compression options:
+.TP
+.BI \-s
+.RI source
+source file to copy from (if any)
+.TP
+.BI "\-S " [djw|fgk]
+enable/disable secondary compression
+.TP
+.BI \-N
+disable small string-matching compression
+.TP
+.BI \-D
+disable external decompression (encode/decode)
+.TP
+.BI \-R
+disable external recompression (decode)
+.TP
+.BI \-n
+disable checksum (encode/decode)
+.TP
+.BI \-C 
+soft config (encode, undocumented)
+.TP
+.BI "\-A " [apphead]
+disable/provide application header (encode)
+.TP
+.BI \-J
+disable output (check/compute only)
+.TP
+.BI \-T
+use alternate code table (test)
+
+.SH NOTES
+The 
+.B XDELTA
+environment variable may contain extra args:
+
+.RS
+XDELTA="-s source-x.y.tar.gz" \\
+.br
+tar --use-compress-program=xdelta3 -cf \\
+.br
+target-x.z.tar.gz.vcdiff target-x.y/
+
+.SH EXAMPLES
+
+Compress the differences between SOURCE and TARGET, yielding OUT, 
+using "djw" secondary compression:
+
+xdelta3 -S djw -s SOURCE TARGET OUT
+
+Do the same, using standard input and output:
+
+xdelta3 -S djw -s SOURCE < TARGET > OUT
+
+To decompress OUT, using SOURCE, yielding TARGET:
+
+xdelta3 -d -s SOURCE OUT TARGET
+
+.SH AUTHOR
+xdelta3 was written by Josh MacDonald <josh.macdonald@gmail.com>.
+.PP
+This manual page was written by Leo 'costela' Antunes <costela@debian.org>
+for the Debian project (but may be used by others).