79 lines
2.4 KiB
PHP
79 lines
2.4 KiB
PHP
<?php
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namespace PhpZip\Util;
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use PhpZip\Exception\ZipException;
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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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* @author Ne-Lexa alexey@nelexa.ru
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* @license MIT
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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 $dosTime Dos date/time
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* @return int Unix timestamp
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*/
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public static function toUnixTimestamp($dosTime)
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{
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if (self::MIN_DOS_TIME > $dosTime) {
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$dosTime = self::MIN_DOS_TIME;
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} elseif (self::MAX_DOS_TIME < $dosTime) {
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$dosTime = self::MAX_DOS_TIME;
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}
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return mktime(
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($dosTime >> 11) & 0x1f, // hour
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($dosTime >> 5) & 0x3f, // minute
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2 * ($dosTime & 0x1f), // second
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($dosTime >> 21) & 0x0f, // month
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($dosTime >> 16) & 0x1f, // day
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1980 + (($dosTime >> 25) & 0x7f) // 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 $unixTimestamp The number of seconds since midnight, January 1st,
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* 1970 AD UTC.
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* @return int A DOS date/time value reflecting the local time zone and
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* rounded down to even seconds
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* and is in between DateTimeConverter::MIN_DOS_TIME and DateTimeConverter::MAX_DOS_TIME.
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* @throws ZipException If unix timestamp is negative.
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*/
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public static function toDosTime($unixTimestamp)
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{
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if (0 > $unixTimestamp) {
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throw new ZipException("Negative unix timestamp: " . $unixTimestamp);
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}
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$date = getdate($unixTimestamp);
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if ($date['year'] < 1980) {
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return self::MIN_DOS_TIME;
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}
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$date['year'] -= 1980;
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return ($date['year'] << 25 | $date['mon'] << 21 |
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$date['mday'] << 16 | $date['hours'] << 11 |
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$date['minutes'] << 5 | $date['seconds'] >> 1);
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}
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}
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