[php-src] Issue #10651: mb_convert_encoding() returns inconsistent output before and after 0x0e 0x0f when converting ISO-2022-JP
| From: | pakutoma | Date: | Tue, 21 Feb 2023 14:41:45 +0000 |
| Subject: | [php-src] Issue #10651: mb_convert_encoding() returns inconsistent output before and after 0x0e 0x0f when converting ISO-2022-JP | ||
| Groups: | php.bugs | ||
| Request: | Send a blank email to php-bugs+get-243766@lists.php.net to get a copy of this message | ||
Issue: https://github.com/php/php-src/issues/10651
Author: pakutoma
### Description
When mb_convert_encoding() interprets ISO-2022-JP byte sequences, the conversion result of 0x5c is
different before and after interpreting 0x0e "Shift out" and 0x0f "Shift in" in
JIS X 0201 mode.
Since these control characters do not have the ability to switch from JIS X 0201 character set to
another, I believe that the same character must be assigned to the same byte sequence before and
after 0x0e 0x0f.
3v4l: https://3v4l.org/XrFGE
The following code:
```php
<?php
$jis_x_0201 = '1b284a';
$yen = '5c';
$shiftout_shiftin = '0e0f';
$ascii = '1b2842';
$byte_seq = $jis_x_0201 . $yen . $shiftout_shiftin . $yen . $ascii;
var_dump($byte_seq);
var_dump(mb_convert_encoding(hex2bin($byte_seq), 'UTF-8', 'JIS'));
```
Resulted in this output:
```
string(20) "1b284a5c0e0f5c1b2842"
string(3) "¥\"
```
But I expected this output instead:
```
string(20) "1b284a5c0e0f5c1b2842"
string(3) "¥¥"
```
### PHP Version
PHP 8.1.16
### Operating System
_No response_