USB_badblocks.php

<?php
declare (strict_types = 1);
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402
// INSTEAD USE https://gist.github.com/divinity76/605547aa19d244c5bd6016cc5d7f2402

const SECTOR_SIZE=512;
if ($argc !== 2) {
    die("usage: {$argv[0]} '/dev/usb'\n");
}
$handle = fopen($argv[1], "r+b");
if (!$handle) {
    die("error: unable to open input file \"{$argv[1]}\"");
}
$error_count = 0;
$size = get_size($argv[1]);
$mb = $size / 1024 / 1024;
$gb = $mb / 1024;
echo "apparent size: {$mb} megabytes aka {$gb} gigabytes, i hope that is correct. - ", PHP_EOL;
if (true) {
    echo "first running overwrite-everything:\n";
    mt_srand(1337);
    $starttime=microtime(true);
    for ($i = 0; $i < $size;) {
        $start=microtime(true);
        $buf = '';
        for ($bsize = 0, $count = min(SECTOR_SIZE, $size - $i); $bsize < $count; ++$bsize) {
            $buf .= chr(mt_rand(0, 255));
        }
        fwrite_all($handle, $buf);
        $i += strlen($buf);
        echo "\r",number_format($i/1024/1024,3),"MB total, ",number_format(($i/$size)*100,5),"% - right now: ", number_format((strlen($buf)/(microtime(true)-$start)) /1024/1024,3),"MB/s, total average: ",number_format(($i/(microtime(true)-$starttime))/1024/1024,3),"MB/s";
    }
    echo "\n";
}
echo "all data written! ... flushing..";
fflush($handle);
rewind($handle);
echo ". done. attempting dropcaches..";
if (!is_writable('/proc/sys/vm/drop_caches')) {
    echo " failed because /proc/sys/vm/drop_caches is not writable.\n";
} elseif (2 !== file_put_contents("/proc/sys/vm/drop_caches", "3\n")) {
    echo "failed because could not write 3.\n";
} else {
    echo ". success!\n";
}
if (true) {
    echo "now verifying..";
    mt_srand(1337);
    $starttime=microtime(true);
    $corrupted_bytes=0;
    $corrupted_bytes_total=0;
    $corrupted_sectors=array();
    for ($i = 0; $i < $size;) {
        $start=microtime(true);
        $buf = '';
        for ($bsize = 0, $count = min(SECTOR_SIZE, $size - $i); $bsize < $count; ++$bsize) {
            $buf .= chr(mt_rand(0, 255));
        }
        $read = fread_all($handle, strlen($buf));
        if (!my_compare($buf,$read,$corrupted_bytes)) {
            echo "\rERROR at sector ".floor($i/512).": {$corrupted_bytes} corrupted bytes!                           \n";
            ++$error_count;
            $corrupted_bytes_total+=$corrupted_bytes;
            $corrupted_sectors[(int)floor($i/512)]=true;
        }
        $i += strlen($read);
        assert(strlen($read) === strlen($buf));
        echo "\r",number_format($i/1024/1024,3),"MB total, ",number_format(($i/$size)*100,5),"% - right now: ", number_format((strlen($buf)/(microtime(true)-$start)) /1024/1024,3),"MB/s, total average: ",number_format(($i/(microtime(true)-$starttime))/1024/1024,3),"MB/s";
    }
    echo "\n";
}
$corrupted_sectors=array_keys($corrupted_sectors);
echo "verification finished! total corrupted sectors: {$error_count} total corrupted bytes: {$corrupted_bytes}\n";
echo "list of corrupted sectors: ";
print_r($corrupted_sectors);
var_dump($error_count);
function my_compare(string $s1,string $s2, int &$incorrect_bytes=0):bool{
    $incorrect_bytes=0;
    $s1len=strlen($s1);
    $s2len=strlen($s2);
    $max=min($s1len,$s2len);
    if($s1len!==$s2len){
        $incorrect_bytes+=abs($s1len-$s2len);
    }
    for($i=0;$i<$max;++$i){
        if($s1[$i]!==$s2[$i]){
            ++$incorrect_bytes;
        }
    }
    return ($incorrect_bytes===0);
}
    /**
     * writes all data or throws
     *
     * @param mixed $handle
     * @param string $data
     * @throws \RuntimeException when fwrite returned <1 but still more data to write
     * @return void
     */
     function fwrite_all($handle, string $data): void
    {
        $original_len = strlen($data);
        if ($original_len > 0) {
            $len = $original_len;
            $written_total = 0;
            for (;;) {
                $written_now = fwrite($handle, $data);
                if ($written_now === $len) {
                    return;
                }
                if ($written_now < 1) {
                    throw new \RuntimeException("could only write {$written_total}/{$original_len} bytes!");
                }
                $written_total += $written_now;
                $data = substr($data, $written_now);
                $len -= $written_now;
                // assert($len > 0);
                // assert($len === strlen($data));
            }
        }
    }
function get_size(string $path): int
{
    $fp = fopen($path, "rb");
    if (!$fp) {
        throw new \RuntimeException("error: unable to open input file \"{$path[1]}\" for reading!");
    }
    fseek($fp, 0, SEEK_END);
    $ret = ftell($fp);
    fclose($fp);
    if (empty($ret) || $ret < 2) {
        throw new \RuntimeException("unable to get size of file! (ftell() returned bogus value {$ret})");
    }
    return $ret;
}