78 lines
No EOL
2 KiB
PHP
78 lines
No EOL
2 KiB
PHP
<?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;
|
|
}
|
|
} |