xdelta3 - Online in the Cloud

PROGRAM:

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

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