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base32.php
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base32.php
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<?php
//
// +----------------------------------------------------------------------+
// | Base32 Library |
// +----------------------------------------------------------------------+
// | Copyright (c) 2001 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is dual-licensed. It is available under the terms |
// | of the GNU GPL v2.0 and under the terms of the PHP license version |
// | 2.02, available at through the world-wide-web at |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// +----------------------------------------------------------------------+
// | Minor fixes and additional functions by Allan Hansen. |
// | Moodle porting work by Martin Langhoff |
// +----------------------------------------------------------------------+
// | base32.php - based on race.php - RACE encode and decode strings. |
// +----------------------------------------------------------------------+
// | Authors: Allan Hansen <All@nHansen.dk> |
// | Arjan Wekking <a.wekking@synantics.nl> |
// | Martin Langhoff <martin@catalyst.net.nz> |
// +----------------------------------------------------------------------+
//
/**
* Base32 encode a binary string
*
* @param $inString Binary string to base32 encode
*
* @return $outString Base32 encoded $inString
*
* @access private
*
*/
function base32_encode ($inString)
{
$outString = "";
$compBits = "";
$BASE32_TABLE = array(
'00000' => 0x61,
'00001' => 0x62,
'00010' => 0x63,
'00011' => 0x64,
'00100' => 0x65,
'00101' => 0x66,
'00110' => 0x67,
'00111' => 0x68,
'01000' => 0x69,
'01001' => 0x6a,
'01010' => 0x6b,
'01011' => 0x6c,
'01100' => 0x6d,
'01101' => 0x6e,
'01110' => 0x6f,
'01111' => 0x70,
'10000' => 0x71,
'10001' => 0x72,
'10010' => 0x73,
'10011' => 0x74,
'10100' => 0x75,
'10101' => 0x76,
'10110' => 0x77,
'10111' => 0x78,
'11000' => 0x79,
'11001' => 0x7a,
'11010' => 0x32,
'11011' => 0x33,
'11100' => 0x34,
'11101' => 0x35,
'11110' => 0x36,
'11111' => 0x37,
);
/* Turn the compressed string into a string that represents the bits as 0 and 1. */
for ($i = 0; $i < strlen($inString); $i++) {
$compBits .= str_pad(decbin(ord(substr($inString,$i,1))), 8, '0', STR_PAD_LEFT);
}
/* Pad the value with enough 0's to make it a multiple of 5 */
if((strlen($compBits) % 5) != 0) {
$compBits = str_pad($compBits, strlen($compBits)+(5-(strlen($compBits)%5)), '0', STR_PAD_RIGHT);
}
/* Create an array by chunking it every 5 chars */
$fiveBitsArray = split("\n",rtrim(chunk_split($compBits, 5, "\n")));
/* Look-up each chunk and add it to $outstring */
foreach($fiveBitsArray as $fiveBitsString) {
$outString .= chr($BASE32_TABLE[$fiveBitsString]);
}
return $outString;
}
/**
* Base32 decode to a binary string
*
* @param $inString String to base32 decode
*
* @return $outString Base32 decoded $inString
*
* @access private
*
*/
function Base32_decode($inString) {
/* declaration */
$inputCheck = null;
$deCompBits = null;
$BASE32_TABLE = array(
0x61 => '00000',
0x62 => '00001',
0x63 => '00010',
0x64 => '00011',
0x65 => '00100',
0x66 => '00101',
0x67 => '00110',
0x68 => '00111',
0x69 => '01000',
0x6a => '01001',
0x6b => '01010',
0x6c => '01011',
0x6d => '01100',
0x6e => '01101',
0x6f => '01110',
0x70 => '01111',
0x71 => '10000',
0x72 => '10001',
0x73 => '10010',
0x74 => '10011',
0x75 => '10100',
0x76 => '10101',
0x77 => '10110',
0x78 => '10111',
0x79 => '11000',
0x7a => '11001',
0x32 => '11010',
0x33 => '11011',
0x34 => '11100',
0x35 => '11101',
0x36 => '11110',
0x37 => '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;
//return $this->raiseError('input to Base32Decode was a bad mod length: '.$inputCheck, null,
// PEAR_ERROR_DIE, null, null, 'Net_RACE_Error', false );
}
/* $deCompBits is a string that represents the bits as 0 and 1.*/
for ($i = 0; $i < strlen($inString); $i++) {
$inChar = ord(substr($inString,$i,1));
if(isset($BASE32_TABLE[$inChar])) {
$deCompBits .= $BASE32_TABLE[$inChar];
} else {
trigger_error('input to Base32Decode had a bad character: '.$inChar);
return false;
//return $this->raiseError('input to Base32Decode had a bad character: '.$inChar, null,
// PEAR_ERROR_DIE, null, null, 'Net_RACE_Error', false );
}
}
/* Step 5 */
$padding = strlen($deCompBits) % 8;
$paddingContent = substr($deCompBits, (strlen($deCompBits) - $padding));
if(substr_count($paddingContent, '1')>0) {
trigger_error('found non-zero padding in Base32Decode');
return false;
//return $this->raiseError('found non-zero padding in Base32Decode', null,
// PEAR_ERROR_DIE, null, null, 'Net_RACE_Error', false );
}
/* Break the decompressed string into octets for returning */
$deArr = array();
for($i = 0; $i < (int)(strlen($deCompBits) / 8); $i++) {
$deArr[$i] = chr(bindec(substr($deCompBits, $i*8, 8)));
}
$outString = join('',$deArr);
return $outString;
}
?>