<?php
class wfHelperBin {
/**
* @param string $bin1
* @param string $bin2
* @return mixed
*/
public static function addbin2bin($bin1, $bin2) {
if (strlen($bin1) % 4 != 0) {
$bin1 = str_repeat("\0", 4 - (strlen($bin1) % 4)) . $bin1;
}
if (strlen($bin2) % 4 != 0) {
$bin2 = str_repeat("\0", 4 - (strlen($bin2) % 4)) . $bin2;
}
$bin1_ints = array_reverse(array_values(unpack('N*', $bin1)));
$bin2_ints = array_reverse(array_values(unpack('N*', $bin2)));
$return = array();
$carries = 0;
for ($i=0; $i < max(count($bin1_ints), count($bin2_ints)); $i++) {
$int1 = array_key_exists($i, $bin1_ints) ? $bin1_ints[$i] : 0;
$int2 = array_key_exists($i, $bin2_ints) ? $bin2_ints[$i] : 0;
$val = $int1 + $int2 + $carries;
if ($carries > 0) {
$carries = 0;
}
if ($val >= 0x100000000) {
$val -= 0x100000000;
$carries++;
}
$return[] = $val;
}
if ($carries) {
$return[] += $carries;
}
$return = array_reverse($return);
array_unshift($return, 'N*');
$return = call_user_func_array('pack', $return);
$return = ltrim($return, "\x00");
return strlen($return) == 0 ? "\x00" : $return;
}
/**
* Convert binary string to the 10101's representation.
*
* @param string $string
* @return string
*/
public static function bin2str($string) {
$return = '';
for ($i = 0; $i < strlen($string); $i++) {
$return .= str_pad(decbin(ord($string[$i])), 8, '0', STR_PAD_LEFT);
}
$return = ltrim($return, '0');
return strlen($return) == 0 ? '0' : $return;
}
/**
* Convert 10101's representation back to the binary data.
*
* @param string $string
* @return string
*/
public static function str2bin($string) {
if (strlen($string) % 32 > 0) {
$string = str_repeat('0', 32 - (strlen($string) % 32)) . $string;
}
$ints = str_split($string, 32);
$return = '';
foreach ($ints as $int) {
$return .= pack('N', bindec($int));
}
$return = ltrim($return, "\0");
return strlen($return) == 0 ? "\0" : $return;
}
}
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