key.php

key.php

<?php

//echo "\033[23\033[;H";

function is_little_endian() {
    $testint = 0x00FF;
    $p = pack('S', $testint);
    return $testint === current(unpack('v', $p));
}

function to_little_endian(string $input) : string {

    if (!is_little_endian()) {
        return $input;
    }

    return implode(array_reverse(str_split($input,2)));
}

$buffer_size = 144;
$buffer_part = 48;

while(true) {

    //3a54f36400000000aeca050000000000040004001e000000   
    $event = @fopen("/dev/input/event4", "rb");

    if ($event) {
        
        
        while (($buffer = fread($event, $buffer_size)) !== false) {
            
            system("clear");
            //echo substr($buffer, 0,8).PHP_EOL;  
            $hex = bin2hex($buffer);
            $start = 0;
            //echo $hex.PHP_EOL;

            while($start < $buffer_size*2) {

                $buffer_hex = substr($hex, $start, $buffer_part);
                echo $buffer_hex.PHP_EOL;
                
                $seconds = substr($buffer_hex,0,8); 
                $seconds = hexdec(to_little_endian($seconds)); 
                
                $microseconds = substr($buffer_hex, 8,16);
                $microseconds = hexdec(to_little_endian($microseconds));

                // 2 bytes = 4hex chars
                $type = substr($buffer_hex, 16, 4); 
                $type = hexdec(to_little_endian($type));
                echo $type.PHP_EOL; 
                
                $code = 1; // 2 bytes = 4hex
                $value = 2; // 4 bytes = 8hex chars
                
                //echo $seconds.' - '.$microseconds.' | time: '.time().' microtime: '.microtime().PHP_EOL;

                $start += $buffer_part;
            }

            //$timeFull = substr($hex,0, 16);
            //$sec = hexdec(substr($timeFull,0,8));
            //$microsec = substr($timeFull,8,16);
            //echo $sec.' - '.$microsec.PHP_EOL;
            //echo strlen($buffer);
            //echo "|";
            //var_dump($hex).PHP_EOL;
            //var_dump($buffer).PHP_EOL;
            //echo $hex.PHP_EOL;
        }

        if (!feof($event)) {
            echo "EOF".PHP_EOL;
        }

        echo "Closing handle";

        fclose($event);
    }

}