upx

Node cross-platform wrapper for UPX

Install

$ npm install --save upx

Usage

const UPX = require('upx')(opts) // see options below

UPX('Hello.exe')
.output('Compressed.exe')
.start().then(function(stats){
  /* stats:
  { cmd: 'compress',
    name: 'Compressed.exe',
    fileSize: { before: '1859072', after: '408064' },
    ratio: '21.95%',
    format: 'win32/pe',
    affected: 1 }
  */
}).catch(function (err) {
  // ...
})

Methods

upx(<path>) : path is the absolute path to the file to compress/decompress.

.output(<output>) : path to the output file.

.start() : Start the compress/decompress process.

Options

The options below can be true or false.

Option	Description
faster	compress faster
better	compress better
best	compress best (can be slow for big files)
decompress	decompress
list	list compressed files
force	force compression of suspicious files
brute	try all available compression methods & filters (slow)
ultraBrute	try even more compression variants (very slow)
overlayCopy	copy any extra data attached to the file (default)
overlayStrip	strip any extra data attached to the file (dangerous)
overlaySkip	don't compress a file with an overlay
8086	make compressed sys work on any 8086 (for dos)
noReloc	put no relocations in to the exe header (for dos)
8bit	uses 8 bit size compression (default: 32 bit)
8mibRam	8 megabyte memory limit (default 2MiB)

Debug

set the env DEBUG: DEBUG=upx node myScript.js

Author

Rocco Musolino (@roccomuso)

License

MIT