XDELTA3

NAME

xdelta3 - VCDIFF (RFC 3284) binary diff tool

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|lzma|none]

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).