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