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Man Pages


Manual Reference Pages  -  XDELTA3 (1)

NAME

xdelta3 - VCDIFF (RFC 3284) binary diff tool

CONTENTS

Synopsis
Description
Commands
Options
Notes
Examples
Author

SYNOPSIS

xdelta3 [command] [options] [input [output]]

DESCRIPTION

xdelta3 is a binary diff tool that uses the VCDIFF (RFC 3284) format and compression.

COMMANDS

config prints xdelta3 configuration
decode decompress the input, also set by -d
encode compress the input, also set by -e (default)
test run the builtin tests
printdelta
  print information about the entire delta
printhdr
  print information about the first window
printhdrs
  print information about all windows
recode encode with new application/secondary settings

OPTIONS

standard options:
-0 .. -9 compression level
-c use stdout
-d decompress
-e compress
-f force overwrite
-h show help
-q be quiet
-v be verbose (max 2)
-V show version

memory options:
-B
  bytes source window size
-W bytes input window size
-P size compression duplicates window
-I size instruction buffer size (0 = unlimited)

compression options:
-s
  source source file to copy from (if any)
-S [djw|fgk]
  enable/disable secondary compression
-N disable small string-matching compression
-D disable external decompression (encode/decode)
-R disable external recompression (decode)
-n disable checksum (encode/decode)
-C soft config (encode, undocumented)
-A [apphead]
  disable/provide application header (encode)
-J disable output (check/compute only)
-T use alternate code table (test)

NOTES

The XDELTA environment variable may contain extra args:

XDELTA="-s source-x.y.tar.gz" \
tar --use-compress-program=xdelta3 -cf \
target-x.z.tar.gz.vcdiff target-x.y/

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

AUTHOR

xdelta3 was written by Josh MacDonald <josh.macdonald@gmail.com>.

This manual page was written by Leo ’costela’ Antunes <costela@debian.org> for the Debian project (but may be used by others).

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Xdelta3 XDELTA3 (1) August 2009

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