{

var $TTF_folder;

var $TTF_RANGE = array('ARIAL.TTF');

var $chars = 5;

var $minsize = 15;

var $maxsize = 15;

var $maxrotation = 30;

var $noise = FALSE;

var $websafecolors = TRUE;

var $debug = FALSE;

var $lx; // width of picture

var $ly; // height of picture

var $jpegquality = 80; // image quality

var $noisefactor = 9; // this will multiplyed with number of chars

var $nb_noise; // number of background-noise-characters

var $TTF_file; // holds the current selected TrueTypeFont

var $gd_version; // holds the Version Number of GD-Library

var $r;

var $g;

var $b;

function masc_captcha( $config )

{

// Test for GD-Library(-Version)

$this->gd_version = get_gd_version();

if($this->gd_version == 0) die("There is no GD-Library-Support enabled. The Captcha-Class cannot be used!");

if($this->debug) echo "\n<br />-Captcha-Debug: The available GD-Library has major version ".$this->gd_version;

// extracts config array

if(is_array($config))

{

if($this->debug) echo "\n<br />-Captcha-Debug: Extracts Config-Array in unsecure-mode!";

foreach($config as $k=>$v) $this->$k = $v;

}

// check vars for maxtry, secretposition and min-max-size

if($this->minsize > $this->maxsize)

{

$temp = $this->minsize;

$this->minsize = $this->maxsize;

$this->maxsize = $temp;

if($this->debug) echo "<br />-Captcha-Debug: Arrghh! What do you think I mean with min and max? Switch minsize with maxsize.";

}

// check TrueTypeFonts

if(is_array($this->TTF_RANGE))

{

if($this->debug) echo "\n<br />-Captcha-Debug: Check given TrueType-Array! (".count($this->TTF_RANGE).")";

$temp = array();

foreach($this->TTF_RANGE as $k=>$v)

{

if(is_readable($this->TTF_folder.$v)) $temp[] = $v;

}

$this->TTF_RANGE = $temp;

if($this->debug) echo "\n<br />-Captcha-Debug: Valid TrueType-files: (".count($this->TTF_RANGE).")";

//if(count($this->TTF_RANGE) < 1) die('No Truetypefont available for the CaptchaClass.');

}

else

{

if($this->debug) echo "\n<br />-Captcha-Debug: Check given TrueType-File! (".$this->TTF_RANGE.")";

if(!is_readable($this->TTF_folder.$this->TTF_RANGE)) die('No Truetypefont available for the CaptchaClass.');

}

// select first TrueTypeFont

$this->change_TTF();

if($this->debug) echo "\n<br />-Captcha-Debug: Set current TrueType-File: (".$this->TTF_file.")";

// get number of noise-chars for background if is enabled

$this->nb_noise = $this->noise ? ($this->chars * $this->noisefactor) : 0;

if($this->debug) echo "\n<br />-Captcha-Debug: Set number of noise characters to: (".$this->nb_noise.")";

// set dimension of image

$this->lx = ($this->chars + 1) * (int)(($this->maxsize + $this->minsize) / 1.5);

$this->ly = (int)(2.4 * $this->maxsize);

if($this->debug) echo "\n<br />-Captcha-Debug: Set image dimension to: (".$this->lx." x ".$this->ly.")";

}

function make_captcha( $private_key )

{

if($this->debug) echo "\n<br />-Captcha-Debug: Generate private key: ($private_key)";

// create Image and set the apropriate function depending on GD-Version & websafecolor-value

if($this->gd_version >= 2 && !$this->websafecolors)

{

$func1 = 'imagecreatetruecolor';

$func2 = 'imagecolorallocate';

}

else

{

$func1 = 'imageCreate';

$func2 = 'imagecolorclosest';

}

$image = $func1($this->lx,$this->ly);

if($this->debug) echo "\n<br />-Captcha-Debug: Generate ImageStream with: ($func1())";

if($this->debug) echo "\n<br />-Captcha-Debug: For colordefinitions we use: ($func2())";

// Set Backgroundcolor

$this->random_color(224, 255);

$back = @imagecolorallocate($image, $this->r, $this->g, $this->b);

@ImageFilledRectangle($image,0,0,$this->lx,$this->ly,$back);

if($this->debug) echo "\n<br />-Captcha-Debug: We allocate one color for Background: (".$this->r."-".$this->g."-".$this->b.")";

// allocates the 216 websafe color palette to the image

if($this->gd_version < 2 || $this->websafecolors) $this->makeWebsafeColors($image);

// fill with noise or grid

if($this->nb_noise > 0)

{

// random characters in background with random position, angle, color

if($this->debug) echo "\n<br />-Captcha-Debug: Fill background with noise: (".$this->nb_noise.")";

for($i=0; $i < $this->nb_noise; $i++)

{

srand((double)microtime()*1000000);

$size = intval(rand((int)($this->minsize / 2.3), (int)($this->maxsize / 1.7)));

srand((double)microtime()*1000000);

$angle = intval(rand(0, 360));

srand((double)microtime()*1000000);

$x = intval(rand(0, $this->lx));

srand((double)microtime()*1000000);

$y = intval(rand(0, (int)($this->ly - ($size / 5))));

$this->random_color(160, 224);

$color = $func2($image, $this->r, $this->g, $this->b);

srand((double)microtime()*1000000);

$text = chr(intval(rand(45,250)));

if(count ($this->TTF_RANGE)>0){

@ImageTTFText($image, $size, $angle, $x, $y, $color, $this->change_TTF(), $text);

} else {

imagestring($image,5,$x,$y,$text,$color);

}

}

}

else

{

// generate grid

if($this->debug) echo "\n<br />-Captcha-Debug: Fill background with x-gridlines: (".(int)($this->lx / (int)($this->minsize / 1.5)).")";

for($i=0; $i < $this->lx; $i += (int)($this->minsize / 1.5))

{

$this->random_color(160, 224);

$color = $func2($image, $this->r, $this->g, $this->b);

@imageline($image, $i, 0, $i, $this->ly, $color);

}

if($this->debug) echo "\n<br />-Captcha-Debug: Fill background with y-gridlines: (".(int)($this->ly / (int)(($this->minsize / 1.8))).")";

for($i=0 ; $i < $this->ly; $i += (int)($this->minsize / 1.8))

{

$this->random_color(160, 224);

$color = $func2($image, $this->r, $this->g, $this->b);

@imageline($image, 0, $i, $this->lx, $i, $color);

}

}

// generate Text

if($this->debug) echo "\n<br />-Captcha-Debug: Fill forground with chars and shadows: (".$this->chars.")";

for($i=0, $x = intval(rand($this->minsize,$this->maxsize)); $i < $this->chars; $i++)

{

$text = utf8_strtoupper(substr($private_key, $i, 1));

srand((double)microtime()*1000000);

$angle = intval(rand(($this->maxrotation * -1), $this->maxrotation));

srand((double)microtime()*1000000);

$size = intval(rand($this->minsize, $this->maxsize));

srand((double)microtime()*1000000);

$y = intval(rand((int)($size * 1.5), (int)($this->ly - ($size / 7))));

$this->random_color(0, 127);

$color = $func2($image, $this->r, $this->g, $this->b);

$this->random_color(0, 127);

$shadow = $func2($image, $this->r + 127, $this->g + 127, $this->b + 127);

if(count($this->TTF_RANGE) > 0){

@ImageTTFText($image, $size, $angle, $x + (int)($size / 15), $y, $shadow, $this->change_TTF(), $text);

@ImageTTFText($image, $size, $angle, $x, $y - (int)($size / 15), $color, $this->TTF_file, $text);

} else {

$t_font = rand(3,5);

imagestring($image,$t_font,$x + (int)($size / 15),$y-20,$text,$color);

imagestring($image,$t_font,$x,$y - (int)($size / 15)-20,$text,$color);

}

$x += (int)($size + ($this->minsize / 5));

}

header('Content-type: image/jpeg');

@ImageJPEG($image, '', $this->jpegquality);

@ImageDestroy($image);

if($this->debug) echo "\n<br />-Captcha-Debug: Destroy Imagestream.";

}

/** @private **/

function makeWebsafeColors(&$image)

{

for($r = 0; $r <= 255; $r += 51)

{

for($g = 0; $g <= 255; $g += 51)

{

for($b = 0; $b <= 255; $b += 51)

{

$color = imagecolorallocate($image, $r, $g, $b);

//$a[$color] = array('r'=>$r,'g'=>$g,'b'=>$b);

}

}

}

if($this->debug) echo "\n<br />-Captcha-Debug: Allocate 216 websafe colors to image: (".imagecolorstotal($image).")";

}

function random_color($min,$max)

{

srand((double)microtime() * 1000000);

$this->r = intval(rand($min,$max));

srand((double)microtime() * 1000000);

$this->g = intval(rand($min,$max));

srand((double)microtime() * 1000000);

$this->b = intval(rand($min,$max));

}

function change_TTF()

{

if(count($this->TTF_RANGE) > 0){

if(is_array($this->TTF_RANGE))

{

srand((float)microtime() * 10000000);

$key = array_rand($this->TTF_RANGE);

$this->TTF_file = $this->TTF_folder.$this->TTF_RANGE[$key];

}

else

{

$this->TTF_file = $this->TTF_folder.$this->TTF_RANGE;

}

return $this->TTF_file;

}

}