[jira] [Closed] (XERCESC-1987) Transcoding Issue with single XMLCh to utf8

["Alberto Massari (JIRA)" <xe...@xml.apache.org>]

     [ https://issues.apache.org/jira/browse/XERCESC-1987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alberto Massari closed XERCESC-1987.
------------------------------------

    Resolution: Won't Fix

The code in the trunk works correctly; we are not backporting fixes to 2.8 though
                
> Transcoding Issue with single XMLCh to utf8
> -------------------------------------------
>
>                 Key: XERCESC-1987
>                 URL: https://issues.apache.org/jira/browse/XERCESC-1987
>             Project: Xerces-C++
>          Issue Type: Bug
>          Components: Utilities
>    Affects Versions: 2.8.0
>         Environment: Windows XP
>            Reporter: Simon White
>
> There appears to be an issue with transcoding to utf8.  Conditions:
> Input string = Single Chinese Character (XmlCh holds value 27493).
> Problem code in TranscodeToStr::transcode:
>     unsigned int allocSize = len * sizeof(XMLCh);
>     fString = (XMLByte*)fMemoryManager->allocate(allocSize);
> This code sets the output buffer to be two bytes.  The issue here is that the character in question converts to a 3 byte utf8 character.  It therefore hits this in XMLUTF8Transcoder.cpp:
>         //  If we cannot fully get this char into the output buffer,
>         //  then leave it for the next time.
>         //
>         if (outPtr + encodedBytes > outEnd)
>             break;
> Since this is only a single character being converted it returns 0 and then hits this since nothing could be decoded:
>         if(charsRead == 0)
>             ThrowXMLwithMemMgr(TranscodingException, XMLExcepts::Trans_BadSrcSeq, fMemoryManager);
> The sequence is not invalid, only output buffer has been limited to input buffer size.  Is simply adding a few spare characters to allocSize the correct fix?

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