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<?php declare(strict_types=1); namespace Intervention\Gif\Encoders; use Intervention\Gif\Blocks\PlainTextExtension; class PlainTextExtensionEncoder extends AbstractEncoder { /** * Create new instance * * @param PlainTextExtension $source */ public function __construct(PlainTextExtension $source) { $this->source = $source; } /** * Encode current source * * @return string */ public function encode(): string { if (!$this->source->hasText()) { return ''; } return implode('', [ PlainTextExtension::MARKER, PlainTextExtension::LABEL, $this->encodeHead(), $this->encodeTexts(), PlainTextExtension::TERMINATOR, ]); } /** * Encode head block * * @return string */ protected function encodeHead(): string { return "\x0c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"; } /** * Encode text chunks * * @return string */ protected function encodeTexts(): string { return implode('', array_map(function ($text) { return pack('C', strlen($text)) . $text; }, $this->source->getText())); } }
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