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<?php
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/**
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 * This file is part of FPDI
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 *
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 * @package   setasign\Fpdi
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 * @copyright Copyright (c) 2023 Setasign GmbH & Co. KG (https://www.setasign.com)
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 * @license   http://opensource.org/licenses/mit-license The MIT License
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 */
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namespace setasign\Fpdi\PdfParser\Type;
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use setasign\Fpdi\PdfParser\StreamReader;
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/**
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 * Class representing a hexadecimal encoded PDF string object
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 */
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class PdfHexString extends PdfType
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{
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    /**
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     * Parses a hexadecimal string object from the stream reader.
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     *
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     * @param StreamReader $streamReader
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     * @return false|self
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     */
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    public static function parse(StreamReader $streamReader)
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    {
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        $bufferOffset = $streamReader->getOffset();
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        while (true) {
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            $buffer = $streamReader->getBuffer(false);
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            $pos = \strpos($buffer, '>', $bufferOffset);
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            if ($pos === false) {
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                if (!$streamReader->increaseLength()) {
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                    return false;
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                }
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                continue;
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            }
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            break;
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        }
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        $result = \substr($buffer, $bufferOffset, $pos - $bufferOffset);
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        $streamReader->setOffset($pos + 1);
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        $v = new self();
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        $v->value = $result;
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        return $v;
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    }
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    /**
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     * Helper method to create an instance.
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     *
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     * @param string $string The hex encoded string.
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     * @return self
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     */
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    public static function create($string)
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    {
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        $v = new self();
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        $v->value = $string;
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        return $v;
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    }
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    /**
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     * Ensures that the passed value is a PdfHexString instance.
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     *
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     * @param mixed $hexString
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     * @return self
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     * @throws PdfTypeException
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     */
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    public static function ensure($hexString)
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    {
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        return PdfType::ensureType(self::class, $hexString, 'Hex string value expected.');
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    }
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}