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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2F'>php-8.4.5</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2Fext%2F'>ext</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2Fext%2Fmbstring%2F'>mbstring</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2Fext%2Fmbstring%2Ftests%2F'>tests</a>/</p><hr><h3>✏️ Editing: mb_decode_mimeheader_variation4.phpt</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'>--TEST--
Test mb_decode_mimeheader() function: weird variations found by fuzzer
--EXTENSIONS--
mbstring
--FILE--
&lt;?php

// We convert runs of whitespace, including CR, LF, tab, and space, to a single space...
// but ONLY when that run of whitespace does not occur right in the middle between two
// valid MIME encoded words
mb_internal_encoding(&#039;UCS-2&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;2,\rGCG\xb3GS&quot;)));

// We DO convert a run of whitespace to a single space at the very beginning of the input string,
// as long as it is followed by a non-whitespace character
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;\n8i&quot;)));

// But not if it is just a CR or LF at the end of the string
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;\r&quot;)));

// Not if it is a run of whitespace going right up to the end of the string
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;\n &quot;)));

// Handle = which doesn&#039;t initiate a valid encoded word
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;,\x13@=,&quot;)));

// Encoded word which should not be accepted
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?I?B??=&quot;)));

// Encoded word with invalid charset name, and input string ends with whitespace
// The old implementation of mb_decode_mimeheader would get &#039;stuck&#039; on the invalid encoding name
// and could never get out of that state; it would not even try to interpret any other encoded words
// up to the end of the input string
mb_internal_encoding(&#039;ISO-8859-7&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?=\x20?=?R\xb7=?=\x20?\x8b\x00====?===??=\xc5UC-R\xb7=?=\x20?=?=====?=\x20?======?======?=\x20?======?===??=\xc5UC-KR\xb7=?=\x20?=?===?==?\x0a&quot;)));

// While the old implementation would generally trim off whitespace at the end of the input string,
// but there was a bug whereby it would not do this when the whitespace character was the 100th
// byte of an invalid charset name
mb_internal_encoding(&#039;UCS-2&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?\xc2\x86tf7,U\x01\x00`@\x00\x04|\xf1D\x18\x00\x00\x00v\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xff\x13f7,U&amp;\x00S\x01\x00\x17,D\xcb\xcb\xcb\xcb\xcb\xcb\xcb\x01\x00\x00\x14\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\xcb\x00\x11\x00\x00\x00\x00\x00\x00\x0a&quot;)));

// Empty encoded word
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?us?B?&quot;)));

// Encoded word with just one invalid Base64 byte
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?us?B?-&quot;)));

// Encoded word with an invalid Base64 byte followed by a valid Base64 byte
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?us?B?-s&quot;)));

// Empty encoded word with a ? which looks like it should be terminator, but = is missing
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?us?B??&quot;)));

// Encoded word with just one invalid Base64 byte, but this time properly terminated
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?us?B?\x00?=&quot;)));

// Invalid encoded word, followed immediately by valid encoded word
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?=?hz?b?&quot;)));

// Another example of invalid encoded word followed immediately by valid encoded word
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?==?hz?b?&quot;)));

// Yet another example
mb_internal_encoding(&#039;ASCII&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;=?,=?hz?b?&quot;)));

// In PHP 8.0-8.1 this would cause a crash
mb_internal_encoding(&#039;UUENCODE&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;&quot;)));

// The conversion filter for SJIS-Mobile#SOFTBANK did not work correctly when it was
// passed the last buffer of wchars without passing &#039;end&#039; flag, then called one more
// time with an empty buffer and &#039;end&#039; flag to finish up
mb_internal_encoding(&#039;SJIS-Mobile#SOFTBANK&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;6&quot;)));

// Same for SJIS-Mobile#KDDI and SJIS-Mobile#DOCOMO
mb_internal_encoding(&#039;SJIS-Mobile#KDDI&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;6&quot;)));
mb_internal_encoding(&#039;SJIS-Mobile#DOCOMO&#039;);
var_dump(bin2hex(mb_decode_mimeheader(&quot;6&quot;)));

?&gt;
--EXPECT--
string(36) &quot;0032002c0020004700430047003f00470053&quot;
string(6) &quot;203869&quot;
string(0) &quot;&quot;
string(0) &quot;&quot;
string(10) &quot;2c13403d2c&quot;
string(16) &quot;3d3f493f423f3f3d&quot;
string(200) &quot;3d3f3d203f3d3f523f3d3f3d203f3f003d3d3d3d3f3d3d3d3f3f3d3f55432d523f3d3f3d203f3d3f3d3d3d3d3d3f3d203f3d3d3d3d3d3d3f3d3d3d3d3d3d3f3d203f3d3d3d3d3d3d3f3d3d3d3f3f3d3f55432d4b523f3d3f3d203f3d3f3d3d3d3f3d3d3f&quot;
string(400) &quot;003d003f003f003f007400660037002c0055000100000060004000000004007c003f004400180000000000000076003f003f003f003f003f003f003f003f003f003f003f003f001300660037002c0055002600000053000100000017002c0044003f003f003f003f003f003f003f0001000000000014003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f003f00000011000000000000000000000000&quot;
string(0) &quot;&quot;
string(2) &quot;3f&quot;
string(2) &quot;3f&quot;
string(0) &quot;&quot;
string(2) &quot;3f&quot;
string(4) &quot;3d3f&quot;
string(6) &quot;3d3f3d&quot;
string(6) &quot;3d3f2c&quot;
string(42) &quot;626567696e20303634342066696c656e616d650a20&quot;
string(2) &quot;36&quot;
string(2) &quot;36&quot;
string(2) &quot;36&quot;
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