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| 1 | <?php declare(strict_types=1); |
| 2 | /** |
| 3 | * VizHash_GD |
| 4 | * |
| 5 | * Visual Hash implementation in php4+GD, |
| 6 | * stripped down from version 0.0.5 beta, modified for PrivateBin |
| 7 | * |
| 8 | * @link https://sebsauvage.net/wiki/doku.php?id=php:vizhash_gd |
| 9 | * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) |
| 10 | * @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License |
| 11 | */ |
| 12 | |
| 13 | namespace PrivateBin; |
| 14 | |
| 15 | /** |
| 16 | * Vizhash16x16 |
| 17 | * |
| 18 | * Example: |
| 19 | * $vz = new Vizhash16x16(); |
| 20 | * $data = $vz->generate(sha512('hello')); |
| 21 | * header('Content-type: image/png'); |
| 22 | * echo $data; |
| 23 | * exit; |
| 24 | */ |
| 25 | class Vizhash16x16 |
| 26 | { |
| 27 | /** |
| 28 | * hash values |
| 29 | * |
| 30 | * @access private |
| 31 | * @var array |
| 32 | */ |
| 33 | private $VALUES; |
| 34 | |
| 35 | /** |
| 36 | * index of current value |
| 37 | * |
| 38 | * @access private |
| 39 | * @var int |
| 40 | */ |
| 41 | private $VALUES_INDEX; |
| 42 | |
| 43 | /** |
| 44 | * image width |
| 45 | * |
| 46 | * @access private |
| 47 | * @var int |
| 48 | */ |
| 49 | private $width; |
| 50 | |
| 51 | /** |
| 52 | * image height |
| 53 | * |
| 54 | * @access private |
| 55 | * @var int |
| 56 | */ |
| 57 | private $height; |
| 58 | |
| 59 | /** |
| 60 | * constructor |
| 61 | * |
| 62 | * @access public |
| 63 | */ |
| 64 | public function __construct() |
| 65 | { |
| 66 | $this->width = 16; |
| 67 | $this->height = 16; |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Generate a 16x16 png corresponding to $text. |
| 72 | * |
| 73 | * The given text should to be 128 to 150 characters long |
| 74 | * |
| 75 | * @access public |
| 76 | * @param string $text |
| 77 | * @return string PNG data. Or empty string if GD is not available. |
| 78 | */ |
| 79 | public function generate($text) |
| 80 | { |
| 81 | if (!function_exists('gd_info')) { |
| 82 | return ''; |
| 83 | } |
| 84 | |
| 85 | $textlen = strlen($text); |
| 86 | |
| 87 | // We convert the hash into an array of integers. |
| 88 | $this->VALUES = []; |
| 89 | for ($i = 0; $i < $textlen; $i = $i + 2) { |
| 90 | array_push($this->VALUES, hexdec(substr($text, $i, 2))); |
| 91 | } |
| 92 | $this->VALUES_INDEX = 0; // to walk the array. |
| 93 | |
| 94 | // Then use these integers to drive the creation of an image. |
| 95 | $image = imagecreatetruecolor($this->width, $this->height); |
| 96 | if ($image === false) { |
| 97 | return ''; |
| 98 | } |
| 99 | |
| 100 | $r = $r0 = $this->getInt(); |
| 101 | $g = $g0 = $this->getInt(); |
| 102 | $b = $b0 = $this->getInt(); |
| 103 | |
| 104 | // First, create an image with a specific gradient background. |
| 105 | $op = 'v'; |
| 106 | if (($this->getInt() % 2) === 0) { |
| 107 | $op = 'h'; |
| 108 | } |
| 109 | $image = $this->degrade($image, $op, [$r0, $g0, $b0], [0, 0, 0]); |
| 110 | |
| 111 | for ($i = 0; $i < 7; ++$i) { |
| 112 | $action = $this->getInt(); |
| 113 | $color = imagecolorallocate($image, $r, $g, $b); |
| 114 | $r = $r0 = (int) ($r0 + $this->getInt() / 25) % 256; |
| 115 | $g = $g0 = (int) ($g0 + $this->getInt() / 25) % 256; |
| 116 | $b = $b0 = (int) ($b0 + $this->getInt() / 25) % 256; |
| 117 | $this->drawshape($image, $action, $color); |
| 118 | } |
| 119 | |
| 120 | $color = imagecolorallocate($image, $this->getInt(), $this->getInt(), $this->getInt()); |
| 121 | $this->drawshape($image, $this->getInt(), $color); |
| 122 | ob_start(); |
| 123 | imagepng($image); |
| 124 | $imagedata = ob_get_contents(); |
| 125 | ob_end_clean(); |
| 126 | if (version_compare(PHP_VERSION, '8.5', '<') && defined('imagedestroy')) { |
| 127 | imagedestroy($image); |
| 128 | } |
| 129 | |
| 130 | return $imagedata; |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Returns a single integer from the $VALUES array (0...255) |
| 135 | * |
| 136 | * @access private |
| 137 | * @return int |
| 138 | */ |
| 139 | private function getInt() |
| 140 | { |
| 141 | $v = $this->VALUES[$this->VALUES_INDEX]; |
| 142 | ++$this->VALUES_INDEX; |
| 143 | $this->VALUES_INDEX %= count($this->VALUES); // Wrap around the array |
| 144 | return $v; |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Returns a single integer from the array (roughly mapped to image width) |
| 149 | * |
| 150 | * @access private |
| 151 | * @return int |
| 152 | */ |
| 153 | private function getX() |
| 154 | { |
| 155 | return (int) ($this->width * $this->getInt() / 256); |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Returns a single integer from the array (roughly mapped to image height) |
| 160 | * |
| 161 | * @access private |
| 162 | * @return int |
| 163 | */ |
| 164 | private function getY() |
| 165 | { |
| 166 | return (int) ($this->height * $this->getInt() / 256); |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Gradient function |
| 171 | * |
| 172 | * taken from: |
| 173 | * @link https://www.supportduweb.com/scripts_tutoriaux-code-source-41-gd-faire-un-degrade-en-php-gd-fonction-degrade-imagerie.html |
| 174 | * |
| 175 | * @access private |
| 176 | * @param resource|\GdImage $img |
| 177 | * @param string $direction |
| 178 | * @param array $color1 |
| 179 | * @param array $color2 |
| 180 | * @return resource|\GdImage |
| 181 | */ |
| 182 | private function degrade($img, $direction, $color1, $color2) |
| 183 | { |
| 184 | if ($direction === 'h') { |
| 185 | $size = imagesx($img); |
| 186 | $sizeinv = imagesy($img); |
| 187 | } else { |
| 188 | $size = imagesy($img); |
| 189 | $sizeinv = imagesx($img); |
| 190 | } |
| 191 | $diffs = [ |
| 192 | ($color2[0] - $color1[0]) / $size, |
| 193 | ($color2[1] - $color1[1]) / $size, |
| 194 | ($color2[2] - $color1[2]) / $size, |
| 195 | ]; |
| 196 | for ($i = 0; $i < $size; ++$i) { |
| 197 | $r = $color1[0] + ((int) $diffs[0] * $i); |
| 198 | $g = $color1[1] + ((int) $diffs[1] * $i); |
| 199 | $b = $color1[2] + ((int) $diffs[2] * $i); |
| 200 | if ($direction === 'h') { |
| 201 | imageline($img, $i, 0, $i, $sizeinv, imagecolorallocate($img, $r, $g, $b)); |
| 202 | } else { |
| 203 | imageline($img, 0, $i, $sizeinv, $i, imagecolorallocate($img, $r, $g, $b)); |
| 204 | } |
| 205 | } |
| 206 | return $img; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Draw a shape |
| 211 | * |
| 212 | * @access private |
| 213 | * @param resource|\GdImage $image |
| 214 | * @param int $action |
| 215 | * @param int $color |
| 216 | */ |
| 217 | private function drawshape($image, $action, $color) |
| 218 | { |
| 219 | switch ($action % 7) { |
| 220 | case 0: |
| 221 | imagefilledrectangle($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $color); |
| 222 | break; |
| 223 | case 1: |
| 224 | case 2: |
| 225 | imagefilledellipse($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $color); |
| 226 | break; |
| 227 | case 3: |
| 228 | $points = [$this->getX(), $this->getY(), $this->getX(), $this->getY(), $this->getX(), $this->getY(), $this->getX(), $this->getY()]; |
| 229 | version_compare(PHP_VERSION, '8.1', '<') ? imagefilledpolygon($image, $points, 4, $color) : imagefilledpolygon($image, $points, $color); |
| 230 | break; |
| 231 | default: |
| 232 | $start = (int) ($this->getInt() * 360 / 256); |
| 233 | $end = (int) ($start + $this->getInt() * 180 / 256); |
| 234 | imagefilledarc($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $start, $end, $color, IMG_ARC_PIE); |
| 235 | } |
| 236 | } |
| 237 | } |