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121 lines
4.1 KiB
121 lines
4.1 KiB
<?php
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/*
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* Base32 encoder/decoder
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*
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* Jared Hancock <jared@osticket.com>
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* Copyright (c) osTicket.com
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*/
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class Base32 {
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/**
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* encode a binary string
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*
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* @param $inString Binary string to base32 encode
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* @return $outString Base32 encoded $inString
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*
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* Original code from
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* http://www.phpkode.com/source/p/moodle/moodle/lib/base32.php. Optimized
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* to double performance
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*/
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function encode($inString)
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{
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$outString = "";
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$compBits = "";
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static $BASE32_TABLE = array(
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'00000' => 'a', '00001' => 'b', '00010' => 'c', '00011' => 'd',
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'00100' => 'e', '00101' => 'f', '00110' => 'g', '00111' => 'h',
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'01000' => 'i', '01001' => 'j', '01010' => 'k', '01011' => 'l',
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'01100' => 'm', '01101' => 'n', '01110' => 'o', '01111' => 'p',
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'10000' => 'q', '10001' => 'r', '10010' => 's', '10011' => 't',
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'10100' => 'u', '10101' => 'v', '10110' => 'w', '10111' => 'x',
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'11000' => 'y', '11001' => 'z', '11010' => '0', '11011' => '1',
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'11100' => '2', '11101' => '3', '11110' => '4', '11111' => '5');
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/* Turn the compressed string into a string that represents the bits as 0 and 1. */
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for ($i = 0, $k = strlen($inString); $i < $k; $i++) {
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$compBits .= str_pad(decbin(ord($inString[$i])), 8, '0', STR_PAD_LEFT);
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}
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/* Pad the value with enough 0's to make it a multiple of 5 */
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if ((($len = strlen($compBits)) % 5) != 0) {
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$compBits = str_pad($compBits, $len+(5-($len % 5)), '0', STR_PAD_RIGHT);
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}
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/* Create an array by chunking it every 5 chars */
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$fiveBitsArray = str_split($compBits, 5);
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/* Look-up each chunk and add it to $outstring */
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foreach ($fiveBitsArray as $fiveBitsString) {
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$outString .= $BASE32_TABLE[$fiveBitsString];
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}
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return $outString;
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}
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/**
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* decode to a binary string
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*
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* @param $inString String to base32 decode
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*
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* @return $outString Base32 decoded $inString
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*
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* @access private
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*
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*/
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function decode($inString) {
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/* declaration */
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$deCompBits = '';
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$outString = '';
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static $BASE32_TABLE = array(
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'a' => '00000', 'b' => '00001', 'c' => '00010', 'd' => '00011',
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'e' => '00100', 'f' => '00101', 'g' => '00110', 'h' => '00111',
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'i' => '01000', 'j' => '01001', 'k' => '01010', 'l' => '01011',
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'm' => '01100', 'n' => '01101', 'o' => '01110', 'p' => '01111',
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'q' => '10000', 'r' => '10001', 's' => '10010', 't' => '10011',
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'u' => '10100', 'v' => '10101', 'w' => '10110', 'x' => '10111',
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'y' => '11000', 'z' => '11001', '0' => '11010', '1' => '11011',
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'2' => '11100', '3' => '11101', '4' => '11110', '5' => '11111');
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/* Step 1 */
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$inputCheck = strlen($inString) % 8;
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if(($inputCheck == 1)||($inputCheck == 3)||($inputCheck == 6)) {
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trigger_error('input to Base32Decode was a bad mod length: '.$inputCheck);
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return false;
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}
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/* $deCompBits is a string that represents the bits as 0 and 1.*/
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for ($i = 0, $k = strlen($inString); $i < $k; $i++) {
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$inChar = $inString[$i];
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if(isset($BASE32_TABLE[$inChar])) {
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$deCompBits .= $BASE32_TABLE[$inChar];
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} else {
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trigger_error('input to Base32Decode had a bad character: '.$inChar);
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return false;
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}
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}
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/* Break the decompressed string into octets for returning */
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foreach (str_split($deCompBits, 8) as $chunk) {
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if (strlen($chunk) != 8) {
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// Ensure correct padding
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if (substr_count($chunk, '1')>0) {
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trigger_error('found non-zero padding in Base32Decode');
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return false;
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}
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break;
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}
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$outString .= chr(bindec($chunk));
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}
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return $outString;
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}
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}
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?>
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