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Bug #50954 iconv_mime_encode fails in Q-encoding
Submitted: 2010-02-07 14:15 UTC Modified: 2010-05-04 15:00 UTC
From: hiroaki dot kawai at gmail dot com Assigned:
Status: Duplicate Package: ICONV related
PHP Version: 5.2.12 OS:
Private report: No CVE-ID: None
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From: hiroaki dot kawai at gmail dot com
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 [2010-02-07 14:15 UTC] hiroaki dot kawai at gmail dot com
iconv_mime_encode fails Q-encoding when encoding non-ascii chars, 
which case is very common. This problem does not happen if line-length 
is long enough to hold the encoded string in a single line. 

The code use unsigned int to capture expected byte. In Q-encoding, the 
value is goes to negative value (at iconv.c line 1295), and fails 
separating the value into multiple lines.

Patch as following:
--- iconv.c.orig	2008-12-31 20:17:49.000000000 +0900
+++ iconv.c	2010-02-07 11:01:54.436000000 +0900
@@ -1217,7 +1217,7 @@
 				prev_in_left = ini_in_left = in_left;
 				ini_in_p = in_p;
-				for (out_size = char_cnt; out_size > 
0;) {
+				for (out_size = (char_cnt-2)/3; 
out_size > 0;) {
 					size_t prev_out_left;
 					nbytes_required = 0;

Reproduce code:
echo iconv_mime_encode('a',"\xE3\x83\x86\xE3\x82\xB9\xE3\x83\x88\xE3\x83\x86\xE3\x82\xB9\xE3\x83\x88",array('output-charset'=>'UTF-8','input-charset'=>'UTF-8','scheme'=>'Q','line-length'=>30));

Expected result:
a: =?UTF-8?Q?=E3=83=86?=

Actual result:
Notice: iconv_mime_encode(): Unknown error (7) in /home/hawk/hoge.php on 
line 3


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 [2010-02-07 17:37 UTC]
Please do not submit the same bug more than once. An existing
bug report already describes this very problem. Even if you feel
that your issue is somewhat different, the resolution is likely
to be the same. 

Thank you for your interest in PHP.

See bug #48289
 [2010-02-08 00:22 UTC] hiroaki dot kawai at gmail dot com
I'm not sure this is a dup of #48289 because I could not reproduce the 
test case. So I created a separete report. If you are sure this is a dup 
of #48289, please mark this as "Duplicate" not "Bogus". Bogus means "the 
report was not a bug at last".
 [2010-04-29 20:58 UTC] softex at kaliningrad dot ru
I have the same problem using non-ascii characters in second argument of the function. 

When to expect this patch to be included in new release?
 [2010-05-04 13:12 UTC] softex at kaliningrad dot ru
This function does not work in Base64 mode too using utf-8 charset.
 [2010-05-04 13:52 UTC]
-Status: Bogus +Status: Duplicate
 [2010-05-04 13:52 UTC]
It does indeed look like a dupe. Changing the status accordingly.
 [2010-05-04 14:34 UTC] softex at kaliningrad dot ru
This function add also space character to the each wrapped line
 [2010-05-04 15:00 UTC]
The spaces aren't a bug; that's part of the folding behaviour specified in section 2.2.3 of RFC 5322.

Also, even if they were a bug, they'd be a separate issue. This is now closed. :)
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