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