<?php
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namespace PhpZip\Util;
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/**
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* Convert unix timestamp values to DOS date/time values and vice versa.
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*
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* The DOS date/time format is a bitmask:
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*
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* 24 16 8 0
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* +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
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* |Y|Y|Y|Y|Y|Y|Y|M| |M|M|M|D|D|D|D|D| |h|h|h|h|h|m|m|m| |m|m|m|s|s|s|s|s|
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* +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
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* \___________/\________/\_________/ \________/\____________/\_________/
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* year month day hour minute second
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*
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* The year is stored as an offset from 1980.
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* Seconds are stored in two-second increments.
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* (So if the "second" value is 15, it actually represents 30 seconds.)
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*
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* @see https://docs.microsoft.com/ru-ru/windows/win32/api/winbase/nf-winbase-filetimetodosdatetime?redirectedfrom=MSDN
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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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class DateTimeConverter
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{
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/**
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* Smallest supported DOS date/time value in a ZIP file,
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* which is January 1st, 1980 AD 00:00:00 local time.
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*/
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const MIN_DOS_TIME = 0x210000; // (1 << 21) | (1 << 16)
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/**
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* Largest supported DOS date/time value in a ZIP file,
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* which is December 31st, 2107 AD 23:59:58 local time.
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*/
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const MAX_DOS_TIME = 0xff9fbf7d; // ((2107 - 1980) << 25) | (12 << 21) | (31 << 16) | (23 << 11) | (59 << 5) | (58 >> 1);
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/**
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* Convert a 32 bit integer DOS date/time value to a UNIX timestamp value.
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*
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* @param int $dosTime Dos date/time
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*
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* @return int Unix timestamp
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*/
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public static function msDosToUnix($dosTime)
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{
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if ($dosTime <= self::MIN_DOS_TIME) {
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$dosTime = 0;
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} elseif ($dosTime > self::MAX_DOS_TIME) {
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$dosTime = self::MAX_DOS_TIME;
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}
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// date_default_timezone_set('UTC');
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return mktime(
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(($dosTime >> 11) & 0x1f), // hours
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(($dosTime >> 5) & 0x3f), // minutes
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(($dosTime << 1) & 0x3e), // seconds
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(($dosTime >> 21) & 0x0f), // month
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(($dosTime >> 16) & 0x1f), // day
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((($dosTime >> 25) & 0x7f) + 1980) // year
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);
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}
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/**
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* Converts a UNIX timestamp value to a DOS date/time value.
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*
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* @param int $unixTimestamp the number of seconds since midnight, January 1st,
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* 1970 AD UTC
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*
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* @return int a DOS date/time value reflecting the local time zone and
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* rounded down to even seconds
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* and is in between DateTimeConverter::MIN_DOS_TIME and DateTimeConverter::MAX_DOS_TIME
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*/
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public static function unixToMsDos($unixTimestamp)
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{
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if ($unixTimestamp < 0) {
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throw new \InvalidArgumentException('Negative unix timestamp: ' . $unixTimestamp);
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}
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$date = getdate($unixTimestamp);
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$dosTime = (
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(($date['year'] - 1980) << 25) |
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($date['mon'] << 21) |
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($date['mday'] << 16) |
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($date['hours'] << 11) |
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($date['minutes'] << 5) |
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($date['seconds'] >> 1)
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);
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if ($dosTime <= self::MIN_DOS_TIME) {
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$dosTime = 0;
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}
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return $dosTime;
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}
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}
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