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<?php
namespace Bitrix\Main\Text;
use Bitrix\Main\Config\Configuration;
class Encoding
{
/**
* Converts data from a source encoding to a target encoding.
*
* @param string|array|\SplFixedArray $data The data to convert. From main 16.0.10 data can be an array.
* @param string $charsetFrom The source encoding.
* @param string $charsetTo The target encoding.
* @return string|array|\SplFixedArray|bool Returns converted data or false on error.
*/
public static function convertEncoding($data, $charsetFrom, $charsetTo)
{
$charsetFrom = static::resolveAlias($charsetFrom);
$charsetTo = static::resolveAlias($charsetTo);
if ((string)$charsetFrom == '' || (string)$charsetTo == '')
{
// incorrect encoding
return $data;
}
if (strcasecmp($charsetFrom, $charsetTo) == 0)
{
// no need to convert
return $data;
}
try
{
// mb_encoding_aliases emits an E_WARNING level error if encoding is unknown
if (@mb_encoding_aliases($charsetFrom) === false || @mb_encoding_aliases($charsetTo) === false)
{
// unknown encoding
return $data;
}
}
catch (\ValueError)
{
return $data;
}
return self::convert($data, $charsetFrom, $charsetTo);
}
protected static function resolveAlias($alias)
{
static $map = [
'csksc56011987' => 'euc-kr',
'ks_c_5601-1987' => 'euc-kr',
'ks_c_5601-1989' => 'euc-kr',
'ksc5601' => 'euc-kr',
'ksc_5601' => 'euc-kr',
'windows-1257' => 'ISO-8859-13',
];
if (is_string($alias))
{
$alias = strtolower(trim($alias));
if (isset($map[$alias]))
{
return $map[$alias];
}
}
return $alias;
}
protected static function convert($data, $charsetFrom, $charsetTo)
{
if (is_array($data) || $data instanceof \SplFixedArray)
{
//let's do a recursion
if ($data instanceof \SplFixedArray)
{
$result = clone $data;
}
else
{
$result = [];
}
foreach ($data as $key => $value)
{
$newKey = self::convert($key, $charsetFrom, $charsetTo);
$newValue = self::convert($value, $charsetFrom, $charsetTo);
$result[$newKey] = $newValue;
}
return $result;
}
elseif (is_string($data))
{
if ($data == '')
{
return '';
}
return static::convertByMbstring($data, $charsetFrom, $charsetTo);
}
return $data;
}
/**
* @deprecated Deprecated in main 16.0.10. Use Encoding::convertEncoding().
* @param $data
* @param $charsetFrom
* @param $charsetTo
* @return string|array|\SplFixedArray|bool
*/
public static function convertEncodingArray($data, $charsetFrom, $charsetTo)
{
return self::convertEncoding($data, $charsetFrom, $charsetTo);
}
/**
* @param string $string
* @return string
*/
public static function convertEncodingToCurrent($string)
{
return self::convertToUtf($string);
}
/**
* @param string $string
* @return string
*/
public static function convertToUtf($string)
{
if (self::detectUtf8($string))
{
return $string;
}
$from = Configuration::getValue("default_charset");
if (!$from)
{
$from = defined('BX_DEFAULT_CHARSET') ? constant('BX_DEFAULT_CHARSET') : 'Windows-1251';
}
return self::convertEncoding($string, $from, 'UTF-8');
}
/**
* @param string $string
* @param bool $replaceHex
* @return bool
*/
public static function detectUtf8($string, $replaceHex = true)
{
if ($replaceHex)
{
$string = preg_replace_callback(
"/(%)([\\dA-F]{2})/i",
function ($match) {
return chr(hexdec($match[2]));
},
$string
);
}
return (bool)preg_match('//u', $string);
}
protected static function convertByMbstring($data, $charsetFrom, $charsetTo)
{
//For UTF-16 we have to detect the order of bytes
//Default for mbstring extension is Big endian
//Little endian have to pointed explicitly
if (strtoupper($charsetFrom) == "UTF-16")
{
$ch = substr($data, 0, 1);
if ($ch == "\xFF" && substr($data, 1, 1) == "\xFE")
{
//If Little endian found - cutoff BOF bytes and point mbstring to this fact explicitly
$res = mb_convert_encoding(substr($data, 2), $charsetTo, "UTF-16LE");
}
elseif ($ch == "\xFE" && substr($data, 1, 1) == "\xFF")
{
//If it is Big endian, just remove BOF bytes
$res = mb_convert_encoding(substr($data, 2), $charsetTo, $charsetFrom);
}
else
{
//Otherwise, assime Little endian without BOF
$res = mb_convert_encoding($data, $charsetTo, "UTF-16LE");
}
}
else
{
$res = mb_convert_encoding($data, $charsetTo, $charsetFrom);
}
return $res;
}
}