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| <?php | |
| /** | |
| * VizHash_GD | |
| * | |
| * Visual Hash implementation in php4+GD, | |
| * stripped down and modified version for PrivateBin | |
| * | |
| * @link http://sebsauvage.net/wiki/doku.php?id=php:vizhash_gd | |
| * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) | |
| * @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License | |
| * @version 0.0.5 beta PrivateBin 1.4.0 | |
| */ | |
| namespace PrivateBin; | |
| /** | |
| * Vizhash16x16 | |
| * | |
| * Example: | |
| * $vz = new Vizhash16x16(); | |
| * $data = $vz->generate(sha512('hello')); | |
| * header('Content-type: image/png'); | |
| * echo $data; | |
| * exit; | |
| */ | |
| class Vizhash16x16 | |
| { | |
| /** | |
| * hash values | |
| * | |
| * @access private | |
| * @var array | |
| */ | |
| private $VALUES; | |
| /** | |
| * index of current value | |
| * | |
| * @access private | |
| * @var int | |
| */ | |
| private $VALUES_INDEX; | |
| /** | |
| * image width | |
| * | |
| * @access private | |
| * @var int | |
| */ | |
| private $width; | |
| /** | |
| * image height | |
| * | |
| * @access private | |
| * @var int | |
| */ | |
| private $height; | |
| /** | |
| * constructor | |
| * | |
| * @access public | |
| */ | |
| public function __construct() | |
| { | |
| $this->width = 16; | |
| $this->height = 16; | |
| } | |
| /** | |
| * Generate a 16x16 png corresponding to $text. | |
| * | |
| * The given text should to be 128 to 150 characters long | |
| * | |
| * @access public | |
| * @param string $text | |
| * @return string PNG data. Or empty string if GD is not available. | |
| */ | |
| public function generate($text) | |
| { | |
| if (!function_exists('gd_info')) { | |
| return ''; | |
| } | |
| $textlen = strlen($text); | |
| // We convert the hash into an array of integers. | |
| $this->VALUES = array(); | |
| for ($i = 0; $i < $textlen; $i = $i + 2) { | |
| array_push($this->VALUES, hexdec(substr($text, $i, 2))); | |
| } | |
| $this->VALUES_INDEX = 0; // to walk the array. | |
| // Then use these integers to drive the creation of an image. | |
| $image = imagecreatetruecolor($this->width, $this->height); | |
| $r = $r0 = $this->getInt(); | |
| $g = $g0 = $this->getInt(); | |
| $b = $b0 = $this->getInt(); | |
| // First, create an image with a specific gradient background. | |
| $op = 'v'; | |
| if (($this->getInt() % 2) == 0) { | |
| $op = 'h'; | |
| } | |
| $image = $this->degrade($image, $op, array($r0, $g0, $b0), array(0, 0, 0)); | |
| for ($i = 0; $i < 7; ++$i) { | |
| $action = $this->getInt(); | |
| $color = imagecolorallocate($image, $r, $g, $b); | |
| $r = $r0 = ($r0 + $this->getInt() / 25) % 256; | |
| $g = $g0 = ($g0 + $this->getInt() / 25) % 256; | |
| $b = $b0 = ($b0 + $this->getInt() / 25) % 256; | |
| $this->drawshape($image, $action, $color); | |
| } | |
| $color = imagecolorallocate($image, $this->getInt(), $this->getInt(), $this->getInt()); | |
| $this->drawshape($image, $this->getInt(), $color); | |
| ob_start(); | |
| imagepng($image); | |
| $imagedata = ob_get_contents(); | |
| ob_end_clean(); | |
| imagedestroy($image); | |
| return $imagedata; | |
| } | |
| /** | |
| * Returns a single integer from the $VALUES array (0...255) | |
| * | |
| * @access private | |
| * @return int | |
| */ | |
| private function getInt() | |
| { | |
| $v = $this->VALUES[$this->VALUES_INDEX]; | |
| ++$this->VALUES_INDEX; | |
| $this->VALUES_INDEX %= count($this->VALUES); // Warp around the array | |
| return $v; | |
| } | |
| /** | |
| * Returns a single integer from the array (roughly mapped to image width) | |
| * | |
| * @access private | |
| * @return int | |
| */ | |
| private function getX() | |
| { | |
| return $this->width * $this->getInt() / 256; | |
| } | |
| /** | |
| * Returns a single integer from the array (roughly mapped to image height) | |
| * | |
| * @access private | |
| * @return int | |
| */ | |
| private function getY() | |
| { | |
| return $this->height * $this->getInt() / 256; | |
| } | |
| /** | |
| * Gradient function | |
| * | |
| * taken from: | |
| * http://www.supportduweb.com/scripts_tutoriaux-code-source-41-gd-faire-un-degrade-en-php-gd-fonction-degrade-imagerie.html | |
| * | |
| * @access private | |
| * @param resource $img | |
| * @param string $direction | |
| * @param array $color1 | |
| * @param array $color2 | |
| * @return resource | |
| */ | |
| private function degrade($img, $direction, $color1, $color2) | |
| { | |
| if ($direction == 'h') { | |
| $size = imagesx($img); | |
| $sizeinv = imagesy($img); | |
| } else { | |
| $size = imagesy($img); | |
| $sizeinv = imagesx($img); | |
| } | |
| $diffs = array( | |
| (($color2[0] - $color1[0]) / $size), | |
| (($color2[1] - $color1[1]) / $size), | |
| (($color2[2] - $color1[2]) / $size), | |
| ); | |
| for ($i = 0; $i < $size; ++$i) { | |
| $r = $color1[0] + ($diffs[0] * $i); | |
| $g = $color1[1] + ($diffs[1] * $i); | |
| $b = $color1[2] + ($diffs[2] * $i); | |
| if ($direction == 'h') { | |
| imageline($img, $i, 0, $i, $sizeinv, imagecolorallocate($img, $r, $g, $b)); | |
| } else { | |
| imageline($img, 0, $i, $sizeinv, $i, imagecolorallocate($img, $r, $g, $b)); | |
| } | |
| } | |
| return $img; | |
| } | |
| /** | |
| * Draw a shape | |
| * | |
| * @access private | |
| * @param resource $image | |
| * @param int $action | |
| * @param int $color | |
| */ | |
| private function drawshape($image, $action, $color) | |
| { | |
| switch ($action % 7) { | |
| case 0: | |
| imagefilledrectangle($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $color); | |
| break; | |
| case 1: | |
| case 2: | |
| imagefilledellipse($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $color); | |
| break; | |
| case 3: | |
| $points = array($this->getX(), $this->getY(), $this->getX(), $this->getY(), $this->getX(), $this->getY(), $this->getX(), $this->getY()); | |
| imagefilledpolygon($image, $points, 4, $color); | |
| break; | |
| default: | |
| $start = $this->getInt() * 360 / 256; | |
| $end = $start + $this->getInt() * 180 / 256; | |
| imagefilledarc($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $start, $end, $color, IMG_ARC_PIE); | |
| } | |
| } | |
| } |