<?php namespace PhpZip\Util; /** * Pack util. * * @author Ne-Lexa alexey@nelexa.ru * @license MIT * * @internal */ final class PackUtil { /** * @param int $longValue * * @return string */ public static function packLongLE($longValue) { if (\PHP_VERSION_ID >= 506030) { return pack('P', $longValue); } $left = 0xffffffff00000000; $right = 0x00000000ffffffff; $r = ($longValue & $left) >> 32; $l = $longValue & $right; return pack('VV', $l, $r); } /** * @param string $value * * @return int */ public static function unpackLongLE($value) { if (\PHP_VERSION_ID >= 506030) { return unpack('P', $value)[1]; } $unpack = unpack('Va/Vb', $value); return $unpack['a'] + ($unpack['b'] << 32); } /** * Cast to signed int 32-bit. * * @param int $int * * @return int */ public static function toSignedInt32($int) { if (\PHP_INT_SIZE === 8) { $int &= 0xffffffff; if ($int & 0x80000000) { return $int - 0x100000000; } } return $int; } }