%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\Text\Service;
class EncodingService {
public const COMMON_ENCODINGS = [ 'UTF-8', 'GB2312', 'GBK', 'BIG-5', 'SJIS-win', 'EUC-JP', 'Windows-1252', 'ISO-8859-15', 'ISO-8859-1', 'ASCII'];
public const UTF_BOMs = [
'UTF-32BE' => "\x00\x00\xfe\xff",
'UTF-32LE' => "\xff\xfe\x00\x00",
'UTF-16BE' => "\xfe\xff",
'UTF-16LE' => "\xff\xfe",
'UTF-8' => "\xef\xbb\xbf"
];
public function encodeToUtf8(string $string): ?string {
$encoding = $this->detectEncoding($string);
if ($encoding === null) {
return null;
}
$encoded = mb_convert_encoding($string, 'UTF-8', $encoding);
return is_string($encoded) ? $encoded : null;
}
public function detectEncoding(string $string): ?string {
$bomDetect = $this->detectUtfBom($string);
if ($bomDetect !== null) {
return $bomDetect;
}
foreach ($this->getEncodings() as $encoding) {
if (mb_check_encoding($string, $encoding)) {
return $encoding;
}
}
return mb_detect_encoding($string, $this->getEncodings(), true) ?: null;
}
private function detectUtfBom(string $string): ?string {
foreach (self::UTF_BOMs as $encoding => $utfBom) {
$bom = substr($string, 0, strlen($utfBom));
if ($bom === $utfBom) {
return $encoding;
}
}
return null;
}
/**
* @return string[]
*/
private function getEncodings(): array {
$mbOrder = mb_detect_order() ?: [];
return array_merge(is_array($mbOrder) ? $mbOrder : [], self::COMMON_ENCODINGS);
}
}
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