Carlos Lopez's Firmware LZMA Extractor for Windows.php

<?php

// Carlos Lopez's Firmware LZMA Extractor for Windows
// Requires 7-Zip (http://www.7-zip.org/)
// <3 León, Nicaragua
// facebook.com/carlos.ernesto.1990
// 22/11/2017

if( !function_exists('hex2bin') ) {
	function hex2bin( $input ) {
		return pack("H*" , $input);
	}
}

class CarlosLZMA {
	private $fileContents = '';
	private $prospects = array();
	private $sessionid;
	private $lzma_levels = array();
  private $found = 0;
  
	public function __construct() {
		$this->lzma_levels = array('5d00000100',
						     	   '5d00001000',
						     	   '5d00000800',
						     	   '5d00001000',
						           '5d00002000',
						           '5d00004000',
						     	   '5d00008000',
						     	   '5d00000001',
						     	   '5d00000002');

		$this->sessionid = md5('carloslzma'.session_id().microtime().rand(9, 9999));
	}

	public function readBinaryFileAsHex($filename) {
		$this->fileContents = bin2hex(file_get_contents($filename));
	}

	public function generateProspects() {
		$count = 1;
		foreach($this->lzma_levels as $level) {
			$prospects = preg_split('/'.$level.'[a-z0-9]{0,30}2020/', $this->fileContents);
			$this->prospects[$level] = $prospects;
			print 'Level '.$count.': '.count($this->prospects)." found\n";
			$count++;
		}
	}

	public function addHeaderToProspects() {
		mkdir('./'.$this->sessionid);
		$count = 0;
		foreach($this->lzma_levels as $level) {
			foreach($this->prospects[$level] as $prospect) {
				if( strlen($prospect) > 0 ) {
					$prospect = $level.'0000001000000000002020'.$prospect;
					file_put_contents('./'.$this->sessionid.'/'.$count.'.lzma', hex2bin($prospect));
					$count++;
				}
			}
		}
	}

	public function extractFiles() {
     chdir('./'.$this->sessionid);
		$dir = opendir('./');
		while(($f = readdir($dir))!==false) {
			$fparts = explode('.', $f);
			if( $fparts[1] == 'lzma' ) {
				shell_exec('"C:/Program Files/7-Zip/7z.exe" e ./'.$f.' -y -bb0');
			}
		}
		closedir($dir);
	}
	
	public function removeNonValidProspects() {
    sleep(3);
		$dir = opendir('./');
		while(($f = readdir($dir))!==false) {
      $fparts = explode('.', $f);
			if( ($fparts[1] == 'lzma') || ($fparts[1] != 'lzma' && filesize('./'.$f) < (50 * 1024)) && $f != '.' && $f != '..' )
        unlink('./'.$f);
      else $this->found++;
		}
		closedir($dir);
	}

	public function getValidProspects() {
		$validProspects = array();
		$subdirs = opendir('./'.$this->sessionid);
		foreach($subdirs as $dir) {
			if(is_dir('./'.$this->sessionid.'/'.$dir) && !in_array($dir, array('.', '..')))
				$validProspects[] = $dir;
		}
		return $validProspects;
	}
	
	public function getFound() {
    return $this->found - 2; # . and ..
	}
	
	public function getSession() {
    return $this->sessionid;
	}
}
	
$clzma = new CarlosLZMA();
$clzma->readBinaryFileAsHex( $argv[1] );
$clzma->generateProspects();
$clzma->addHeaderToProspects();
$clzma->extractFiles();
$clzma->removeNonValidProspects();
print "\n Done... ".$clzma->getFound()." files extracted at ".$clzma->getSession();
?>