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admin/phpMyAdmin/libraries/classes/Encoding.php
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347
admin/phpMyAdmin/libraries/classes/Encoding.php
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<?php
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declare(strict_types=1);
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namespace PhpMyAdmin;
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use function array_intersect;
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use function array_map;
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use function explode;
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use function fclose;
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use function feof;
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use function fgets;
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use function fopen;
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use function function_exists;
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use function fwrite;
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use function recode_string;
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use function mb_convert_encoding;
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use function mb_convert_kana;
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use function mb_detect_encoding;
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use function mb_list_encodings;
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use function tempnam;
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use function unlink;
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use function iconv;
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/**
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* Encoding conversion helper class
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*/
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class Encoding
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{
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/**
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* None encoding conversion engine
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*/
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public const ENGINE_NONE = 0;
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/**
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* iconv encoding conversion engine
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*/
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public const ENGINE_ICONV = 1;
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/**
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* recode encoding conversion engine
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*/
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public const ENGINE_RECODE = 2;
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/**
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* mbstring encoding conversion engine
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*/
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public const ENGINE_MB = 3;
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/**
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* Chosen encoding engine
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*
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* @var int
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*/
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private static $engine = null;
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/**
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* Map of conversion engine configurations
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*
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* Each entry contains:
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*
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* - function to detect
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* - engine contant
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* - extension name to warn when missing
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*
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* @var array
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*/
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private static $enginemap = [
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'iconv' => [
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'iconv',
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self::ENGINE_ICONV,
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'iconv',
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],
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'recode' => [
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'recode_string',
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self::ENGINE_RECODE,
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'recode',
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],
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'mb' => [
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'mb_convert_encoding',
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self::ENGINE_MB,
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'mbstring',
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],
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'none' => [
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'isset',
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self::ENGINE_NONE,
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'',
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],
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];
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/**
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* Order of automatic detection of engines
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*
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* @var array
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*/
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private static $engineorder = [
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'iconv',
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'mb',
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'recode',
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];
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/**
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* Kanji encodings list
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*
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* @var string
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*/
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private static $kanjiEncodings = 'ASCII,SJIS,EUC-JP,JIS';
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/**
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* Initializes encoding engine detecting available backends.
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*/
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public static function initEngine(): void
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{
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$engine = 'auto';
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if (isset($GLOBALS['cfg']['RecodingEngine'])) {
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$engine = $GLOBALS['cfg']['RecodingEngine'];
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}
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/* Use user configuration */
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if (isset(self::$enginemap[$engine])) {
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if (function_exists(self::$enginemap[$engine][0])) {
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self::$engine = self::$enginemap[$engine][1];
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return;
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}
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Core::warnMissingExtension(self::$enginemap[$engine][2]);
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}
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/* Autodetection */
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foreach (self::$engineorder as $engine) {
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if (function_exists(self::$enginemap[$engine][0])) {
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self::$engine = self::$enginemap[$engine][1];
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return;
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}
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}
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/* Fallback to none conversion */
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self::$engine = self::ENGINE_NONE;
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}
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/**
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* Setter for engine. Use with caution, mostly useful for testing.
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*
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* @param int $engine Engine encoding
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*/
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public static function setEngine(int $engine): void
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{
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self::$engine = $engine;
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}
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/**
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* Checks whether there is any charset conversion supported
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*/
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public static function isSupported(): bool
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{
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if (self::$engine === null) {
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self::initEngine();
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}
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return self::$engine != self::ENGINE_NONE;
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}
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/**
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* Converts encoding of text according to parameters with detected
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* conversion function.
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*
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* @param string $src_charset source charset
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* @param string $dest_charset target charset
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* @param string $what what to convert
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*
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* @return string converted text
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*
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* @access public
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*/
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public static function convertString(
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string $src_charset,
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string $dest_charset,
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string $what
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): string {
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if ($src_charset == $dest_charset) {
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return $what;
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}
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if (self::$engine === null) {
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self::initEngine();
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}
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switch (self::$engine) {
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case self::ENGINE_RECODE:
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return recode_string(
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$src_charset . '..' . $dest_charset,
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$what
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);
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case self::ENGINE_ICONV:
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return iconv(
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$src_charset,
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$dest_charset .
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($GLOBALS['cfg']['IconvExtraParams'] ?? ''),
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$what
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);
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case self::ENGINE_MB:
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return mb_convert_encoding(
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$what,
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$dest_charset,
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$src_charset
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);
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default:
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return $what;
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}
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}
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/**
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* Detects whether Kanji encoding is available
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*/
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public static function canConvertKanji(): bool
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{
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return $GLOBALS['lang'] === 'ja';
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}
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/**
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* Setter for Kanji encodings. Use with caution, mostly useful for testing.
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*/
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public static function getKanjiEncodings(): string
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{
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return self::$kanjiEncodings;
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}
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/**
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* Setter for Kanji encodings. Use with caution, mostly useful for testing.
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*
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* @param string $value Kanji encodings list
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*/
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public static function setKanjiEncodings(string $value): void
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{
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self::$kanjiEncodings = $value;
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}
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/**
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* Reverses SJIS & EUC-JP position in the encoding codes list
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*/
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public static function kanjiChangeOrder(): void
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{
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$parts = explode(',', self::$kanjiEncodings);
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if ($parts[1] === 'EUC-JP') {
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self::$kanjiEncodings = 'ASCII,SJIS,EUC-JP,JIS';
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} else {
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self::$kanjiEncodings = 'ASCII,EUC-JP,SJIS,JIS';
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}
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}
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/**
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* Kanji string encoding convert
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*
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* @param string $str the string to convert
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* @param string $enc the destination encoding code
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* @param string $kana set 'kana' convert to JIS-X208-kana
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*
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* @return string the converted string
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*/
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public static function kanjiStrConv(string $str, string $enc, string $kana): string
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{
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if ($enc == '' && $kana == '') {
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return $str;
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}
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$string_encoding = mb_detect_encoding($str, self::$kanjiEncodings);
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if ($string_encoding === false) {
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$string_encoding = 'utf-8';
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}
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if ($kana === 'kana') {
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$dist = mb_convert_kana($str, 'KV', $string_encoding);
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$str = $dist;
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}
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if ($string_encoding != $enc && $enc != '') {
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$dist = mb_convert_encoding($str, $enc, $string_encoding);
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} else {
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$dist = $str;
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}
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return $dist;
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}
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/**
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* Kanji file encoding convert
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*
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* @param string $file the name of the file to convert
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* @param string $enc the destination encoding code
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* @param string $kana set 'kana' convert to JIS-X208-kana
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*
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* @return string the name of the converted file
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*/
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public static function kanjiFileConv(string $file, string $enc, string $kana): string
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{
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if ($enc == '' && $kana == '') {
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return $file;
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}
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$tmpfname = (string) tempnam($GLOBALS['PMA_Config']->getUploadTempDir(), $enc);
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$fpd = fopen($tmpfname, 'wb');
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$fps = fopen($file, 'r');
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self::kanjiChangeOrder();
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while (! feof($fps)) {
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$line = fgets($fps, 4096);
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$dist = self::kanjiStrConv($line, $enc, $kana);
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fwrite($fpd, $dist);
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}
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self::kanjiChangeOrder();
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fclose($fps);
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fclose($fpd);
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unlink($file);
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return $tmpfname;
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}
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/**
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* Defines radio form fields to switch between encoding modes
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*
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* @return string HTML code for the radio controls
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*/
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public static function kanjiEncodingForm(): string
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{
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$template = new Template();
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return $template->render('encoding/kanji_encoding_form');
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}
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/**
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* Lists available encodings.
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*
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* @return array
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*/
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public static function listEncodings(): array
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{
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if (self::$engine === null) {
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self::initEngine();
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}
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/* Most engines do not support listing */
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if (self::$engine != self::ENGINE_MB) {
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return $GLOBALS['cfg']['AvailableCharsets'];
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}
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return array_intersect(
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array_map('strtolower', mb_list_encodings()),
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$GLOBALS['cfg']['AvailableCharsets']
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);
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}
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}
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