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Item7747: EDITFORMFIELD garbles some Unicode characters

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AppliesTo: Component: Priority: CurrentState: WaitingFor: TargetRelease ReleasedIn
Engine   Normal Closed   patch 6.1.0

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Applies To:
Current State:
Waiting For:
Target Release:
Released In:


%EDITFORMFIELD{"FIELD" topic="TOPIC"}% garbles some Unicode characters. This is caused by CGI::* functions for form input fields used under the hood. Those functions call HTML::Entities::encode_entities(), which converts an "unsafe" character into an entity representation (&something;).

This may happen with any multi-byte character encoding, but let's take UTF-8 as an example. To this date, TWiki treats characters without setting the UTF-8 flag.

There is a character which is encoded to e3 82 8b in UTF-8. When EDITFORMFIELD handles such a character, CGI::* functions convert the 8b byte into ‹ partly because the UTF-8 flag is not set, which means that three byte sequence is not recognized as a single character but three characters under the hood.

When calling CGI::*, a Unicode string needs to be handed with the UTF-8 flag turned on.

-- TWiki:Main/HideyoImazu - 2016-07-08

Summary EDITFORMFIELD garbles some Unicode characters
ReportedBy TWiki:Main.HideyoImazu
Codebase ~twiki4
SVN Range TWiki-6.0.2-trunk, Thu, 05 May 2016, build 30177
AppliesTo Engine

Priority Normal
CurrentState Closed

Checkins TWikirev:30213 TWikirev:30214 TWikirev:30255 TWikirev:30256
TargetRelease patch
ReleasedIn 6.1.0
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Topic revision: r8 - 2018-07-17 - PeterThoeny
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