UPX解压工具 upx-3.96-win64

NAME

upx - compress or expand executable files

SYNOPSIS

upx [ *command* ] [ *options* ] *filename*...

ABSTRACT

The Ultimate Packer for eXecutables

Copyright (c) 1996-2020 Markus Oberhumer, Laszlo Molnar & John

Reiser

https://upx.github.io

While you may use UPX freely for both non-commercial and commercial

executables (for details see the file LICENSE), we would highly

appreciate if you credit UPX and ourselves in the documentation,

possibly including a reference to the UPX home page. Thanks.

[ Using UPX in non-OpenSource applications without proper credits is

considered not politically correct ;-) ]

DISCLAIMER

UPX comes with ABSOLUTELY NO WARRANTY; for details see the file

LICENSE.

This is the first production quality release, and we plan that future

- very fast decompression: about 10 MiB/sec on an ancient Pentium

133,

about 200 MiB/sec on an Athlon XP 2000+.

- no memory overhead for your compressed executables for most of

the

supported formats

- safe: you can list, test and unpack your executables

Also, a checksum of both the compressed and uncompressed file is

maintained internally.

- universal: UPX can pack a number of executable formats:

* atari/tos

* bvmlinuz/386 [bootable Linux kernel]

* djgpp2/coff

* dos/com

* dos/sys

* linux/386

* linux/elf386

* ps1/exe

* linux/elfamd64

* linux/elfppc32

* mach/elfppc32

- extendable: because of the class layout it's very easy to support

new executable formats or add new compression algorithms

- free: UPX can be distributed and used freely. And from version

0.99

the full source code of UPX is released under the GNU General

Public

executable

COMMANDS

file specified on the command line.

Decompress

All UPX supported file formats can be unpacked using the -d switch,

eg.

upx -d yourfile.exe will uncompress the file you've just compressed.

Test

The -t command tests the integrity of the compressed and uncompressed

data, eg. upx -t yourfile.exe check whether your file can be safely

decompressed. Note, that this command doesn't check the whole file,

only

the part that will be uncompressed during program execution. This

that you should not use this command instead of a virus checker.

List

specified on the command line as parameters, eg upx -l yourfile.exe

shows the compressed / uncompressed size and the compression ratio of

* yourfile.exe*.

OPTIONS

--version: print the version of UPX

--exact: when compressing, require to be able to get a byte-identical

file after decompression with option -d. [NOTE: this is work in

and is not supported for all formats yet. If you do care, as a

workaround you can compress and then decompress your program a first

time - any further compress-decompress steps should then yield

byte-identical results as compared to the first decompressed version.]

COMPRESSION LEVELS & TUNING

performance.

* Compression levels 7, 8 and 9 favor compression ratio over speed.

* Compression level --best may take a long time.

Note that compression level --best can be somewhat slow for large

files,

but you definitely should use it when releasing a final version of

your

program.

Quick info for achieving the best compression ratio:

* Try upx --brute myfile.exe or even upx --ultra-brute myfile.exe.

* Try if --overlay=strip works.

* For win32/pe programs there's --strip-relocs=0. See notes below.

OVERLAY HANDLING OPTIONS

Info: An "overlay" means auxiliary data attached after the logical end

of an executable, and it often contains application specific data

(this

is a common practice to avoid an extra data file, though it would be

[DEFAULT]

--overlay=strip Strip any overlay from the program instead of

copying it. Be warned, this may make the

program crash or otherwise unusable.

--overlay=skip Refuse to compress any program which has an

overlay.

The environment variable UPX can hold a set of default options for

UPX.

Not all of the options are valid in the environment variable - UPX

will

tell you.

You can explicitly use the --no-env option to ignore the environment

variable.

NOTES FOR THE SUPPORTED EXECUTABLE FORMATS

NOTES FOR ATARI/TOS

This is the executable format used by the Atari ST/TT, a Motorola

68000

based personal computer which was popular in the late '80s. Support of

this format is only because of nostalgic feelings of one of the

and serves no practical purpose :-). See http://www.freemint.de for

more

info.

Packed programs will be byte-identical to the original after

uncompression. All debug information will be stripped, though.

anyway.

NOTES FOR DOS/COM

Obviously UPX won't work with executables that want to read data from

themselves (like some commandline utilities that ship with

Compressed programs only work on a 286+.

Packed programs will be byte-identical to the original after

uncompression.

Maximum uncompressed size: ~65100 bytes.

anyway.

--all-filters Compress the program several times, using all

improve

anyway.

NOTES FOR DOS/EXE

dos/exe stands for all "normal" 16-bit DOS executables.

Obviously UPX won't work with executables that want to read data from

themselves (like some command line utilities that ship with