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<?php declare(strict_types=1); namespace Intervention\Gif\Decoders; use Intervention\Gif\Blocks\CommentExtension; class CommentExtensionDecoder extends AbstractDecoder { /** * Decode current source * * @return CommentExtension */ public function decode(): CommentExtension { $this->getNextBytes(2); // skip marker & label $extension = new CommentExtension(); foreach ($this->decodeComments() as $comment) { $extension->addComment($comment); } return $extension; } /** * Decode comment from current source * * @return array */ protected function decodeComments(): array { $comments = []; do { $byte = $this->getNextByte(); $size = $this->decodeBlocksize($byte); if ($size > 0) { $comments[] = $this->getNextBytes($size); } } while ($byte !== CommentExtension::TERMINATOR); return $comments; } /** * Decode blocksize of following comment * * @param string $byte * @return int */ protected function decodeBlocksize(string $byte): int { return (int) @unpack('C', $byte)[1]; } }
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