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<?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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