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<?php
/**
* @file
* This file is part of the PdfParser library.
*
* @author Sébastien MALOT <sebastien@malot.fr>
*
* @date 2017-01-03
*
* @license LGPLv3
*
* @url <https://github.com/smalot/pdfparser>
*
* PdfParser is a pdf library written in PHP, extraction oriented.
* Copyright (C) 2017 - Sébastien MALOT <sebastien@malot.fr>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.
* If not, see <http://www.pdfparser.org/sites/default/LICENSE.txt>.
*/
namespace Smalot\PdfParser\Element;
use Smalot\PdfParser\Document;
/**
* Class ElementHexa
*/
class ElementHexa extends ElementString
{
/**
* @return bool|ElementHexa|ElementDate
*/
public static function parse(string $content, ?Document $document = null, int &$offset = 0)
{
if (preg_match('/^\s*\<(?P<name>[A-F0-9]+)\>/is', $content, $match)) {
$name = $match['name'];
$offset += strpos($content, '<'.$name) + \strlen($name) + 2; // 1 for '>'
// repackage string as standard
$name = '('.self::decode($name).')';
$element = ElementDate::parse($name, $document);
if (!$element) {
$element = ElementString::parse($name, $document);
}
return $element;
}
return false;
}
public static function decode(string $value): string
{
$text = '';
// Filter $value of non-hexadecimal characters
$value = (string) preg_replace('/[^0-9a-f]/i', '', $value);
// Check for leading zeros (4-byte hexadecimal indicator), or
// the BE BOM
if ('00' === substr($value, 0, 2) || 'feff' === strtolower(substr($value, 0, 4))) {
$value = (string) preg_replace('/^feff/i', '', $value);
for ($i = 0, $length = \strlen($value); $i < $length; $i += 4) {
$hex = substr($value, $i, 4);
$text .= '&#'.str_pad(hexdec($hex), 4, '0', \STR_PAD_LEFT).';';
}
} else {
// Otherwise decode this as 2-byte hexadecimal
for ($i = 0, $length = \strlen($value); $i < $length; $i += 2) {
$hex = substr($value, $i, 2);
$text .= \chr(hexdec($hex));
}
}
$text = html_entity_decode($text, \ENT_NOQUOTES, 'UTF-8');
return $text;
}
}
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