Hackers Magazine 57/CdHackersMagazineNr57.iso/Software/Programming/dhtmlxMenu.exe/dhtmlxMenu/libCompiler/convert.php

PHP Script | 2008-08-04 | 5.4 KB | 180 lines

<?php
// *********************
// * Conversion helper *
// * Created by: Seven *
// *********************

// Since ZIP-files like using Dostime, i've written this small helper function
// set, making it easier to read and write Dostime

// clear documentation about Dostime:
// www.vsft.com/hal/dostime.htm
// thanks Vilma Software! :)


// format according to MSDN:
// 5 bytes for seconds divided by 2, 6 bytes for minutes and 5 bytes for the hours :)

// write 16bit dostime output

function dostime_get($offset) {

    // take about 2 kilograms of hours
    $doshour = gmdate("G") + 1;
    $doshour = $doshour + $offset;

        // we won't be worrying about the date, that'll be the next function ;)
    if($doshour > 23) $doshour = $doshour - 24;
    if($doshour < 0) $doshour = $doshour + 24;

    $doshour = $doshour * pow(2,11);

    // mix it with about 250 grams of minutes
    $dosminute = gmdate("i") * pow(2,5);

    // then add a pinch of seconds
    $dossecond = round(gmdate("s") / 2);

    // mix them together and whack them in the oven for about 20 minutes
    $dostime = $doshour+$dosminute+$dossecond;

    // and it's ready to be served! :)
    return $dostime;

    // "whack" is a registered trademark of Jamie Oliver. All rights reserved.
};

// format according to MSDN:
// 5 bytes for days, 4 for month, 7 for years from 1980... can go for 128 years then, so warn me in 2108 ;)

function dosdate_get($offset) {
    // date
    $dosyear = (gmdate("Y") - 1980);
    $dosmonth = gmdate("m");
    $dosday = gmdate("j");

    // checking if date is valid
    // starting with... is the day too high after applying offset?
    if(gmdate("G") + $offset > 23) {
        $dosday++;
        if($dosday > date("t")) {
            $dosday = 1;
            $dosmonth++;
            if($dosmonth > 12) {
                $dosmonth = 1;
                $dosyear++;
            };
        };
    };

    // then, is the day too low after applying offset?
    if(gmdate("G") + 1 + $offset < 0) { // +1 to fix the erm... standard -1 offset this pc has... strange thou :p
        $dosday = $dosday - 1;
        if($dosday < 1) {
            // ok, little helper array, containing the months that have 30 days:)
            $dirtydays = array(4,6,9,11);
            if(in_array($dirtydays,$dosmonth - 1)) {     // is it one month after one of the feared months, added in the array above?
                $dosday = 30;
            } elseif ($dosmonth == 3) {             // is it march then?
                $dosday = 28+date("L");
            } else {                    // then the month before this one must have 31 days :)
                $dosday = 31;
            };

            $dosmonth --;
            if($dosmonth < 1){
                $dosmonth == 12;
                $dosyear --; // i aint checking this one, we're not creating files b4 1980 anyway ;)
            };
        };
    };

    // wow, that took me some thinking, let's go to an easier part, returning!
    $dosyear = $dosyear * pow(2,9);
    $dosmonth = $dosmonth * pow(2,5);
    return $dosyear+$dosmonth+$dosday;
}

// Now this process must be reversed aswell. I think the most easy method for this is just returning an array with data.

function dostime_return($dostime) {
    $dostime = decbin(ascii2dec($dostime)); //looks nasty, but hey, it works ;)
    $dostime = str_pad($dostime,16,"0",STR_PAD_LEFT);

    // retreiving the needed data... 5-6-5 was the format
    // *** Warning! *** Waarschuwing! *** Achtung! ***
    // I don't know if this works on little endian machines the way it works on big-endian ones
    // So let's hope for the best

    $return['hours'] = substr($dostime,0,5);
    $return['minutes'] = substr($dostime,5,6);
    $return['seconds'] = substr($dostime,11,5);

    unset($dostime);

    // now processing the info to the right format
    $return['hours'] = bindec($return['hours']);
    $return['minutes'] = bindec($return['minutes']);
    $return['seconds'] = bindec($return['seconds']) * 2;
    return $return;
}

// this is mostly a copy of dostime_return
function dosdate_return($dosdate) {
    $dosdate = decbin(ascii2dec($dosdate)); //looks nasty, but hey, it works ;)
    $dosdate = str_pad($dosdate,16,"0",STR_PAD_LEFT);

    // retreiving the needed data... 5-4-7 was the format
    // *** Warning! *** Waarschuwing! *** Achtung! ***
    // I don't know if this works on little endian machines the way it works on big-endian ones
    // So let's hope for the best

    $return['year'] = substr($dosdate,0,7);
    $return['month'] = substr($dosdate,7,4);
    $return['day'] = substr($dosdate,11,5);

    unset($dosdate);

    // now processing the info to the right format
    $return['day'] = bindec($return['day']);
    $return['month'] = bindec($return['month']);
    $return['year'] = bindec($return['year']) + 1980;
    return $return;
}

// Also useful is this ascii2dec convertor, will be a well used conversion when reading a zipfile
// simple but powerful :)

function ascii2dec($input) {
    $end = strlen($input);
    $multiplier = 1;
    for($i=0; $i < $end; $i++) {
        $output = $output + (ord($input[$i]) * $multiplier); // I think Max wants some credit for this [$i] method
        $multiplier = $multiplier * 256;
    }
    unset ($input);
    return $output;
}

// Extension to content-type header conversion.
function ext2cth($filename) {
    $filename = explode(".",$filename);
    $extension = array_pop($filename);

    // 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
    // been included

    if(!$types_is_included){
        require ("./array_filetypes.php");
        $types_is_included = TRUE;
    }

    $extension = strtolower($extension);
    $filetype = $type[$extension];
    if(empty($filetype)) {
        $filetype = $type['default'];
    }
    return $filetype;
}
?>