unlimited-download.php downloads 'bilder.zip' with infinite size.

unlimited-download.php

<?php

// Consts
$UNLIMITED_DOWNLOAD_OUTPUT = "unlimited_download_output";
$BUFFER = 1024 * 1024;
$WRITE_BUFFER = 64 * 1024 * 1024;


function writeInformation ($size) {
    $data = "Headers:\n";

    foreach($_SERVER as $key => $value) {
        if (substr($key, 0, 5) <> 'HTTP_' && gettype($value) == "string") {
            $data = $data . $key . ": " . $value . "\n";
        }
    }
    $data = $data . "\nSize:\n" . $size;
    $out = file_put_contents("unlimited_download_output" . DIRECTORY_SEPARATOR . $_SERVER['REMOTE_ADDR'] . ".txt", $data);
    if ($out === false) {
        die("Log function failed: status false.");
    }
}


header('Content-Type: application/zip');
header('Content-Disposition: attachment; filename=bilder.zip');

if (!is_dir($UNLIMITED_DOWNLOAD_OUTPUT)) {
    mkdir($UNLIMITED_DOWNLOAD_OUTPUT);
}

$i = 0;
while(true) {
    echo random_bytes($BUFFER);
    $i += $BUFFER;
    if ($i % $WRITE_BUFFER == 0) {
        writeInformation($i);
    }
    flush();
}


?>