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