Woobscreen.php

<?php
    function getFileAsHexStr($file_name)
    {
        $ret = "";
        $handle = fopen($file_name, "rb");
        if($handle)
        {
            while(!feof($handle))
            {
                $c = fgetc($handle);
                $t = (($c & 0xF0) >> 4) & 0xF;
                $ret .= ((($t >= 0) && ($t <= 9)) ? ('0' + $t) : ('A' + ($t - 0xA)));
                $t = $c & 0xF;
                $ret .= ((($t >= 0) && ($t <= 9)) ? ('0' + $t) : ('A' + ($t - 0xA)));
            }
            fclose($handle);
        }
        return $ret;
    }

    function writeHexStrAsFile($file_name, $str)
    {
        $ret = "";
        $handle = fopen($file_name, "wb");
        $t = '\0';
        $s = false;
        if($handle)
        {
            $str_len = strlen($str);
            for($i = 0; $i < $str_len; $i++)
            {
                switch($str[$i])
                {
                case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':
                    if($s) fputs($handle, $t | ($str[$i] - '0'));
                    else $t = (($str[$i] - '0') << 4);
                    $s = !$s;
                    break;
                case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
                    if($s) fputs($handle, $t | (($str[$i] + 0xA ) - 'a'));
                    else $t = ((($str[$i] + 0xA ) - 'a') << 4);
                    $s = !$s;
                    break;
                case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
                    if($s) fputs($handle, $t | (($str[$i] + 0xA) - 'A'));
                    else $t = ((($str[$i] + 0xA) - 'A') << 4);
                    $s = !$s;
                    break;
                }
            }
            $ret = true;
            fclose($handle);
        }
        return $ret;
    }
?>