John Davidson

Message:

I am trying to build a function which decodes a CS:GO match sharing code. I have seen enough examples but everyhting is in JS or C# but nothing in PHP.

I took the akiver demo manager as an example and i tried to replicate it in PHP. I am going bit blind because i have no idea what is the output on a certain points so i can only hope that the result will be what i expect it to be. I think i am on the right path, the problem comes when the bytes have to be created/interpeted/converted to the desire outcome.

The code that should be decoded is the following: 'CSGO-oPRbA-uTQuR-UFkiC-hYWMB-syBcO' ($getNextGame variable)

The result should be 3418217537907720662

My code so far:

 /**

 * @param $getNextGame

 * @return array

 */

 public function decodeDemoCode(string $getNextGame): array

 {

     $shareCodePattern = "/CSGO(-?[\w]{5}){5}$/";

     if (preg_match($shareCodePattern, $getNextGame) === 1) {

        $result = [];

        $bigNumber = 0;

        $matchIdBytes = $outcomeIdBytes = $tvPortIdBytes = [];

        $dictionary = "ABCDEFGHJKLMNOPQRSTUVWXYZabcdefhijkmnopqrstuvwxyz23456789";

        $dictionaryLength = strlen($dictionary);



        $changedNextGame = str_replace(array("CSGO", "-"), "", $getNextGame);

        $chars = array_reverse(str_split($changedNextGame));

        foreach ($chars as $char) {

           $bigNumber = ($bigNumber * $dictionaryLength) + strpos($dictionary, $char);

        }

     }

 }

This brings me back something like that:

1.86423701402E+43 (double)

Then i have the following:

$packed = unpack("C*", $bigNumber);

$reversedPacked = array_reverse($packed);

and this brings the following back:

array(17 items)

   0 => 51 (integer)

   1 => 52 (integer)

   2 => 43 (integer)

   3 => 69 (integer)

   4 => 50 (integer)

   5 => 48 (integer)

   6 => 52 (integer)

   7 => 49 (integer)

   8 => 48 (integer)

   9 => 55 (integer)

   10 => 51 (integer)

   11 => 50 (integer)

   12 => 52 (integer)

   13 => 54 (integer)

   14 => 56 (integer)

   15 => 46 (integer)

   16 => 49 (integer)

Now here i am not really sure what to do because i do not completely understand C# and i have never worked with bytes in PHP before.

Generally the return type should be an array and would look something like that:

$result = [

   matchId => 3418217537907720662,

   reservationId => 3418217537907720662,

   tvPort => 55788

];

Thanks in advance. Any help is deeply appreciated

---

My Answer:
. I am not sure how to convert it to PHP. Can someone help me with this?

Here is an example of a CS:GO match sharing code: "CSGO-abcdef-ghijk-lmnop-qrstu-vwxyz"

I need to decode this code and extract the match details such as map, score, players, etc.

Any help would be greatly appreciated. Thank you!