Chrome/Firefox cache file extractor

cache-extractor.php

<?php
/*
 * Chrome/Firefox cache file extractor
 * Just open cache entry page and copy/paste file data hex section 
 * into "cachefile.txt" file in script working directory and run me.
 * You can run me through CLI or Webserver.
 *
 * Change $is_gzip to false if data is not gzip encoded.
 * 
 * Chrome:		chrome://cache
 * Firefox:		about:cache
 * 
 * @author	Mehran Ahadi
 * @link	http://mehran.ahadi.me/
 * @link	https://medium.com/@zxcmehran/recover-the-past-4b721d73badd
 */

// change to false if it's not gzipped.
$is_gzip = true;

//input file
$cachehexfile = 'cachefile.txt';

// output file, undecompressed
$hexout = 'cachefile.bin';

// output file, decompressed
$gzout = 'cachefile-extracted.txt';




define('LINE_LIMIT', 16);
define('TIME_PERIOD', 3);

$stime = $time = time();
$counter = 0;
$if = fopen($cachehexfile, 'r');
$of = fopen($hexout, 'wb');

while($l = fgets($if)){
	$matches = array();
	preg_match_all('/([0-9a-f]{2}) /', $l, $matches);
	$limit = 0;
	foreach ($matches[1] as $match) {
		if($limit == LINE_LIMIT){
			break;
		}
		fwrite($of, pack('H*', $match));
		$limit++;
	}
	
	$counter += LINE_LIMIT;
	if(time()>=$time+TIME_PERIOD){
		$time = time();
		printf("%0.2f KBytes in %d secs <br>\n", $counter/1024, $time - $stime);
		flush();
	}
}

fclose($if);
fclose($of);

printf("Hex converted in %d secs: %s (%0.2f KBytes) <br>\n", $time-$stime, htmlspecialchars($hexout), $counter/1024);
flush();


// now extract the gzipped file
if($is_gzip){
	echo "Started extracting Gzip data.<br>\n";
	flush();
	
	$sfp = gzopen($hexout, 'rb');
	$fp = fopen($gzout, 'w');
	$stime = $time = time();
	$counter = 0;
	
	while (!gzeof($sfp)) {
		$string = gzread($sfp, 4096);
		fwrite($fp, $string, strlen($string));
		
		$counter += strlen($string);
		
		if(time()>=$time+TIME_PERIOD){
			$time = time();
			printf("%0.2f KBytes in %d secs <br>\n", $counter/1024, $time - $stime);
			flush();
		}
	}

	gzclose($sfp);
	fclose($fp);
	
	printf("Decompressed in %d secs: %s (%0.2f KBytes) <br>\n", $time-$stime, htmlspecialchars($gzout), $counter/1024);
}

Copied from https://gist.github.com/zxcmehran-old/b4cab69b70166187f5cb due to account migration.