Last modified: 2008-08-19 16:50:53 UTC

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Bug 11087 - Image truncated comment chopped UTF-8 character
Image truncated comment chopped UTF-8 character
Status: RESOLVED DUPLICATE of bug 332
Product: MediaWiki
Classification: Unclassified
Uploading (Other open bugs)
All All
: Low trivial (vote)
: ---
Assigned To: Nobody - You can work on this!
Depends on:
Blocks: unicode
  Show dependency treegraph
Reported: 2007-08-27 22:48 UTC by Dan Jacobson
Modified: 2008-08-19 16:50 UTC (History)
2 users (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description Dan Jacobson 2007-08-27 22:48:51 UTC
Observe in the "comment" box on the above URL,
how a UTF-8 3 byte long character has been truncated.

Please consider characters, not bytes, in determining where to truncate.

Else you produce invalid characters: not ASCII, not UTF-8, which show up with the invalid character symbol in browsers.
Comment 1 Dan Jacobson 2007-11-13 00:51:54 UTC
Also please be sure you don't truncate UTF-8 when including snippets which I often see in e.g., my !
Comment 2 Nicolas Dumazet 2008-03-13 23:36:24 UTC
img_description tinyblob NOT NULL

This field is binary and does not store any encoding along with the data. That's why when it comes to truncating the string to fit in the field (255 bytes), SQL do not check if it breaks encoding do so. In my opinion, using a varchar(255), which actually stores in the field the encoding, would solve that problem.
Comment 3 Brion Vibber 2008-03-14 17:17:50 UTC
That's incorrect; VARCHAR would have the same issue.

Note that we do not use MySQL's utterly broken UTF-8 support as it does not actually support UTF-8, but only a limited subset of UTF-8. As a result, we use binary fields for data safety.

As with the related bugs, the correct fix is to apply UTF-8-safe truncation on input data that's destined for short fields.
Comment 4 Marcin Cieślak 2008-08-16 23:53:45 UTC
Isn't this duplicate of bug 332?
Comment 5 Dan Jacobson 2008-08-19 16:50:53 UTC
I guess so.

*** This bug has been marked as a duplicate of bug 332 ***

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