[ http://issues.apache.org/jira/browse/XERCESC-1654?page=all ]
Alberto Massari resolved XERCESC-1654.
--------------------------------------
Resolution: Fixed
Hi Boris,
I have changed the code to use the same computation provided by the Unicode web
site; however, the current code is not wrong as masking with 0x3FF will in any
case discard the bit that the (ch - 0x10000) operation changed.
> Bug in surrogate handling in internal UCS4 transcoder
> -----------------------------------------------------
>
> Key: XERCESC-1654
> URL: http://issues.apache.org/jira/browse/XERCESC-1654
> Project: Xerces-C++
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.7.0
> Environment: any
> Reporter: Boris Kolpackov
>
> In util/XMLUCSTranscoder.cpp there is the following code which handles
> surrogates (line 110):
> const XMLCh ch1 = XMLCh(((nextVal - 0x10000) >> 10) + 0xD800);
> const XMLCh ch2 = XMLCh(((nextVal - 0x10000) & 0x3FF) + 0xDC00);
> I believe the second line should be:
> const XMLCh ch2 = XMLCh((nextVal & 0x3FF) + 0xDC00);
> See http://unicode.org/unicode/faq/utf_bom.html#35 for confirmation. Also,
> while at it, I would suggest renaming XMLUCSTranscoder.cpp to
> XMLUCST4ranscoder.cpp so that it is consistent with XMLUCS4Transcoder.hpp.
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