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Posted to dev@xalan.apache.org by "Lex Spoon (JIRA)" <xa...@xml.apache.org> on 2010/05/17 20:16:42 UTC
[jira] Commented: (XALANJ-2419) Astral characters written as a pair
of NCRs with the surrogate scalar values when using UTF-8
[ https://issues.apache.org/jira/browse/XALANJ-2419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868329#action_12868329 ]
Lex Spoon commented on XALANJ-2419:
-----------------------------------
What are people doing to work around this bug? It appears to make Xalan unsuitable for any documents that might need surrogate characters. Yet, it is left lingering for years, so perhaps it is not as serious as it looks?
> Astral characters written as a pair of NCRs with the surrogate scalar values when using UTF-8
> ---------------------------------------------------------------------------------------------
>
> Key: XALANJ-2419
> URL: https://issues.apache.org/jira/browse/XALANJ-2419
> Project: XalanJ2
> Issue Type: Bug
> Components: Serialization
> Affects Versions: 2.7.1
> Reporter: Henri Sivonen
>
> org.apache.xml.serializer.ToStream contains the following code:
> else if (m_encodingInfo.isInEncoding(ch)) {
> // If the character is in the encoding, and
> // not in the normal ASCII range, we also
> // just leave it get added on to the clean characters
>
> }
> else {
> // This is a fallback plan, we should never get here
> // but if the character wasn't previously handled
> // (i.e. isn't in the encoding, etc.) then what
> // should we do? We choose to write out an entity
> writeOutCleanChars(chars, i, lastDirtyCharProcessed);
> writer.write("&#");
> writer.write(Integer.toString(ch));
> writer.write(';');
> lastDirtyCharProcessed = i;
> }
> This leads to the wrong (latter) if branch running for surrogates, because isInEncoding() for UTF-8 returns false for surrogates. It is always wrong (regardless of encoding) to escape a surrogate as an NCR.
> The practical effect of this bug is that any document with astral characters in it ends up in an ill-formed serialization and does not parse back using an XML parser.
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