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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This file is part of PHPWord - A pure PHP library for reading and writing |
| 5 | * word processing documents. |
| 6 | * |
| 7 | * PHPWord is free software distributed under the terms of the GNU Lesser |
| 8 | * General Public License version 3 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * For the full copyright and license information, please read the LICENSE |
| 11 | * file that was distributed with this source code. For the full list of |
| 12 | * contributors, visit https://github.com/PHPOffice/PHPWord/contributors. |
| 13 | * |
| 14 | * @see https://github.com/PHPOffice/PHPWord |
| 15 | * |
| 16 | * @license http://www.gnu.org/licenses/lgpl.txt LGPL version 3 |
| 17 | */ |
| 18 | |
| 19 | namespace PhpOffice\PhpWord\Shared; |
| 20 | |
| 21 | use Exception; |
| 22 | use PhpOffice\PhpWord\Settings; |
| 23 | use PhpOffice\WMF\Reader\Detector; |
| 24 | use PhpOffice\WMF\Reader\EMF\GD as EMFReader; |
| 25 | use PhpOffice\WMF\Reader\WMF\GD as WMFReader; |
| 26 | |
| 27 | /** |
| 28 | * Windows metafiles (WMF, EMF & EMF+) helper, based on phpoffice/wmf. |
| 29 | * |
| 30 | * The support is optional : it requires the phpoffice/wmf library and the GD extension. |
| 31 | * |
| 32 | * EMF+ files are EMF files containing EMF+ records : they are stored as EMF files. |
| 33 | * The GD readers are used : they are pure PHP and don't depend on external delegates (like Imagick). |
| 34 | */ |
| 35 | class Metafile |
| 36 | { |
| 37 | const MIME_WMF = 'image/x-wmf'; |
| 38 | const MIME_EMF = 'image/x-emf'; |
| 39 | |
| 40 | /** |
| 41 | * Returns if the metafiles are supported : phpoffice/wmf is installed and the GD extension is loaded. |
| 42 | */ |
| 43 | public static function isSupported(): bool |
| 44 | { |
| 45 | return class_exists(Detector::class) && extension_loaded('gd'); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Returns the mime type of a metafile (`image/x-wmf` or `image/x-emf`). |
| 50 | * |
| 51 | * Returns null if the content is not a metafile or if the metafiles are not supported. |
| 52 | */ |
| 53 | public static function getMimeType(string $content): ?string |
| 54 | { |
| 55 | if (!self::isSupported()) { |
| 56 | return null; // @codeCoverageIgnore |
| 57 | } |
| 58 | |
| 59 | switch (Detector::detect($content)) { |
| 60 | case Detector::TYPE_WMF: |
| 61 | return self::MIME_WMF; |
| 62 | case Detector::TYPE_EMF: |
| 63 | case Detector::TYPE_EMFPLUS: |
| 64 | return self::MIME_EMF; |
| 65 | default: |
| 66 | return null; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Returns if the mime type is the one of a metafile. |
| 72 | */ |
| 73 | public static function isMimeType(?string $mimeType): bool |
| 74 | { |
| 75 | return in_array($mimeType, [self::MIME_WMF, self::MIME_EMF], true); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Returns the extension of a metafile mime type (`wmf` or `emf`). |
| 80 | */ |
| 81 | public static function getExtension(string $mimeType): ?string |
| 82 | { |
| 83 | switch ($mimeType) { |
| 84 | case self::MIME_WMF: |
| 85 | return 'wmf'; |
| 86 | case self::MIME_EMF: |
| 87 | return 'emf'; |
| 88 | default: |
| 89 | return null; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Returns the size of a metafile and its mime type, like getimagesize() : [width, height, mimeType]. |
| 95 | * |
| 96 | * Returns null if the content is not a metafile, if it can't be read or if the metafiles are not supported. |
| 97 | * |
| 98 | * @return null|array{0: int, 1: int, 2: string} |
| 99 | */ |
| 100 | public static function getImageSize(string $content): ?array |
| 101 | { |
| 102 | $mimeType = self::getMimeType($content); |
| 103 | if ($mimeType === null) { |
| 104 | return null; |
| 105 | } |
| 106 | $reader = self::load($content, $mimeType); |
| 107 | if ($reader === null) { |
| 108 | return null; |
| 109 | } |
| 110 | |
| 111 | $resource = $reader->getResource(); |
| 112 | |
| 113 | // GdImage since PHP 8.0, resource before |
| 114 | // @phpstan-ignore-next-line |
| 115 | return [imagesx($resource), imagesy($resource), $mimeType]; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Converts a metafile to PNG. |
| 120 | * |
| 121 | * Returns null if the content is not a metafile, if it can't be read or if the metafiles are not supported. |
| 122 | */ |
| 123 | public static function convertToPng(string $content): ?string |
| 124 | { |
| 125 | $mimeType = self::getMimeType($content); |
| 126 | if ($mimeType === null) { |
| 127 | return null; |
| 128 | } |
| 129 | $reader = self::load($content, $mimeType); |
| 130 | if ($reader === null) { |
| 131 | return null; |
| 132 | } |
| 133 | |
| 134 | $tempFilename = tempnam(Settings::getTempDir(), 'PHPWordMetafile'); |
| 135 | if ($tempFilename === false) { |
| 136 | return null; // @codeCoverageIgnore |
| 137 | } |
| 138 | |
| 139 | $png = $reader->save($tempFilename, 'png') ? file_get_contents($tempFilename) : false; |
| 140 | @unlink($tempFilename); |
| 141 | |
| 142 | return $png === false ? null : $png; |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * @return null|EMFReader|WMFReader |
| 147 | */ |
| 148 | private static function load(string $content, string $mimeType) |
| 149 | { |
| 150 | $reader = $mimeType === self::MIME_WMF ? new WMFReader() : new EMFReader(); |
| 151 | |
| 152 | try { |
| 153 | if (!$reader->loadFromString($content)) { |
| 154 | return null; |
| 155 | } |
| 156 | } catch (Exception $e) { |
| 157 | return null; |
| 158 | } |
| 159 | |
| 160 | return $reader; |
| 161 | } |
| 162 | } |