1<?php 2 3/** 4 * webtrees: online genealogy 5 * Copyright (C) 2021 webtrees development team 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 3 of the License, or 9 * (at your option) any later version. 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <https://www.gnu.org/licenses/>. 16 */ 17 18declare(strict_types=1); 19 20namespace Fisharebest\Webtrees\Encodings; 21 22use function chr; 23use function intdiv; 24use function ord; 25use function str_split; 26 27/** 28 * Convert between UTF-16LE and UTF-8. 29 */ 30class UTF16LE extends AbstractUTF16Encoding 31{ 32 public const NAME = 'UTF-16LE'; 33 34 public const BYTE_ORDER_MARK = "\xFF\xFE"; 35 public const REPLACEMENT_CHARACTER = "\xFD\xFF"; 36 37 /** 38 * Convert two bytes to a code-point, taking care of byte-order. 39 * 40 * @param string $character 41 * 42 * @return int 43 */ 44 protected function characterToCodePoint(string $character): int 45 { 46 return ord($character[0]) + 256 * ord($character[1]); 47 } 48 49 /** 50 * Convert a code-point to two bytes, taking care of byte-order. 51 * 52 * @param int $code_point 53 * 54 * @return string 55 */ 56 protected function codePointToCharacter(int $code_point): string 57 { 58 if ($code_point >= 0xD800 && $code_point <= 0xDFFF) { 59 return self::REPLACEMENT_CHARACTER; 60 } 61 62 return chr($code_point % 256) . chr(intdiv($code_point, 256)); 63 } 64} 65