Base32 consistency check brute forcer. Can be given a shard to run over multiple cores.

base32-consistency-tester.php

<?php
/**
 * This is a brute force script to test all 8-bit, 16-bit and 32-bit byte strings
 * using the new Base32 implementation. 
 * - first ensure both implementations produce the same encoding
 * - then ensure the new implementation can decode the encoding
 *
 * To spread the work over multiple cores, provide a prefix and bit len:
 * eg: Two cores (half CPU time)
 * php tester.php 1 1 # bitlen=1, prefix=1
 * php tester.php 1 1 # bitlen=1, prefix=0
 *
 * eg: Four cores (quarter CPU time)
 * php tester.php 1 1 # bitlen=2, prefix=00
 * php tester.php 1 1 # bitlen=2, prefix=01
 * php tester.php 1 1 # bitlen=2, prefix=10
 * php tester.php 1 1 # bitlen=2, prefix=11
 *
 * See the checkIt function for the main operation.
 *
 * This script refers to 'Base32/Base322', which is
 * a copy of an older implementation for cross testing
 */

use Base32\Base32;
use Base32\Base322;

require "vendor/autoload.php";

$bits = 0;
$prefix = 0;

if ($argc > 2) {
    $bits = (int) $argv[1];
    $prefix = bindec($argv[2]);
}

function checkit($loop, $in, $i) {
    echo "loop $loop, $i\n";
    echo bin2hex($in).PHP_EOL;
    $enc = Base32::encode($in);
    $enc2 = Base322::encode($in);
    if ($enc != $enc2) {
        echo "enc didn't match";
        echo "enc=$enc\n";
        echo "enc2=$enc2\n";
        die();
    }
    $in2 = Base32::decode($enc);
    if ($in != $in2) {
        echo "input: ".bin2hex($in).PHP_EOL;
        echo "got back: ".bin2hex($in2).PHP_EOL;
        die();
    }
}
// increment instead of add?

$a = $prefix << (8-$bits);
for ($i = 0; $i < pow(2, 8-$bits); $i++) {
    $num = $a | $i;
    $in = pack("C", $num);
    checkIt('8', $in, $num);
}
$a = $prefix << (16-$bits);
for ($i = 0; $i < pow(2, 16-$bits); $i++) {
    $in = pack("n", $a | $i);
    checkIt('16', $in, $i);
}
$a = $prefix << (32-$bits);
for ($i = 0; $i < pow(2, 32-$bits); $i++) {
    $in = pack("N", $a | $i);
    checkIt('32', $in, $i);
}