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180 lines
5.3 KiB
PHP
180 lines
5.3 KiB
PHP
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<?php
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// *********************
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// * Conversion helper *
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// * Created by: Seven *
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// *********************
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// Since ZIP-files like using Dostime, i've written this small helper function
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// set, making it easier to read and write Dostime
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// clear documentation about Dostime:
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// www.vsft.com/hal/dostime.htm
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// thanks Vilma Software! :)
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// format according to MSDN:
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// 5 bytes for seconds divided by 2, 6 bytes for minutes and 5 bytes for the hours :)
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// write 16bit dostime output
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function dostime_get($offset) {
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// take about 2 kilograms of hours
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$doshour = gmdate("G") + 1;
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$doshour = $doshour + $offset;
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// we won't be worrying about the date, that'll be the next function ;)
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if($doshour > 23) $doshour = $doshour - 24;
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if($doshour < 0) $doshour = $doshour + 24;
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$doshour = $doshour * pow(2,11);
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// mix it with about 250 grams of minutes
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$dosminute = gmdate("i") * pow(2,5);
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// then add a pinch of seconds
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$dossecond = round(gmdate("s") / 2);
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// mix them together and whack them in the oven for about 20 minutes
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$dostime = $doshour+$dosminute+$dossecond;
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// and it's ready to be served! :)
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return $dostime;
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// "whack" is a registered trademark of Jamie Oliver. All rights reserved.
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};
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// format according to MSDN:
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// 5 bytes for days, 4 for month, 7 for years from 1980... can go for 128 years then, so warn me in 2108 ;)
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function dosdate_get($offset) {
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// date
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$dosyear = (gmdate("Y") - 1980);
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$dosmonth = gmdate("m");
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$dosday = gmdate("j");
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// checking if date is valid
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// starting with... is the day too high after applying offset?
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if(gmdate("G") + $offset > 23) {
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$dosday++;
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if($dosday > date("t")) {
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$dosday = 1;
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$dosmonth++;
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if($dosmonth > 12) {
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$dosmonth = 1;
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$dosyear++;
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};
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};
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};
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// then, is the day too low after applying offset?
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if(gmdate("G") + 1 + $offset < 0) { // +1 to fix the erm... standard -1 offset this pc has... strange thou :p
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$dosday = $dosday - 1;
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if($dosday < 1) {
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// ok, little helper array, containing the months that have 30 days:)
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$dirtydays = array(4,6,9,11);
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if(in_array($dirtydays,$dosmonth - 1)) { // is it one month after one of the feared months, added in the array above?
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$dosday = 30;
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} elseif ($dosmonth == 3) { // is it march then?
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$dosday = 28+date("L");
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} else { // then the month before this one must have 31 days :)
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$dosday = 31;
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};
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$dosmonth --;
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if($dosmonth < 1){
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$dosmonth == 12;
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$dosyear --; // i aint checking this one, we're not creating files b4 1980 anyway ;)
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};
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};
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};
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// wow, that took me some thinking, let's go to an easier part, returning!
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$dosyear = $dosyear * pow(2,9);
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$dosmonth = $dosmonth * pow(2,5);
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return $dosyear+$dosmonth+$dosday;
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}
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// Now this process must be reversed aswell. I think the most easy method for this is just returning an array with data.
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function dostime_return($dostime) {
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$dostime = decbin(ascii2dec($dostime)); //looks nasty, but hey, it works ;)
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$dostime = str_pad($dostime,16,"0",STR_PAD_LEFT);
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// retreiving the needed data... 5-6-5 was the format
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// *** Warning! *** Waarschuwing! *** Achtung! ***
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// I don't know if this works on little endian machines the way it works on big-endian ones
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// So let's hope for the best
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$return['hours'] = substr($dostime,0,5);
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$return['minutes'] = substr($dostime,5,6);
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$return['seconds'] = substr($dostime,11,5);
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unset($dostime);
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// now processing the info to the right format
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$return['hours'] = bindec($return['hours']);
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$return['minutes'] = bindec($return['minutes']);
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$return['seconds'] = bindec($return['seconds']) * 2;
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return $return;
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}
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// this is mostly a copy of dostime_return
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function dosdate_return($dosdate) {
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$dosdate = decbin(ascii2dec($dosdate)); //looks nasty, but hey, it works ;)
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$dosdate = str_pad($dosdate,16,"0",STR_PAD_LEFT);
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// retreiving the needed data... 5-4-7 was the format
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// *** Warning! *** Waarschuwing! *** Achtung! ***
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// I don't know if this works on little endian machines the way it works on big-endian ones
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// So let's hope for the best
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$return['year'] = substr($dosdate,0,7);
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$return['month'] = substr($dosdate,7,4);
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$return['day'] = substr($dosdate,11,5);
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unset($dosdate);
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// now processing the info to the right format
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$return['day'] = bindec($return['day']);
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$return['month'] = bindec($return['month']);
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$return['year'] = bindec($return['year']) + 1980;
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return $return;
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}
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// Also useful is this ascii2dec convertor, will be a well used conversion when reading a zipfile
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// simple but powerful :)
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function ascii2dec($input) {
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$end = strlen($input);
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$multiplier = 1;
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for($i=0; $i < $end; $i++) {
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$output = $output + (ord($input[$i]) * $multiplier); // I think Max wants some credit for this [$i] method
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$multiplier = $multiplier * 256;
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}
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unset ($input);
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return $output;
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}
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// Extension to content-type header conversion.
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function ext2cth($filename) {
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$filename = explode(".",$filename);
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$extension = array_pop($filename);
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// I kinda need a gigantic array for this, i'll do this for now by including this array and setting a little var so I know it's
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// been included
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if(!$types_is_included){
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require ("./array_filetypes.php");
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$types_is_included = TRUE;
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}
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$extension = strtolower($extension);
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$filetype = $type[$extension];
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if(empty($filetype)) {
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$filetype = $type['default'];
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}
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return $filetype;
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}
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?>
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