[jira] [Resolved] (XERCESJ-1574) Problem with detected encoding for UTF-16 encoded as Unicode Little

["Michael Glavassevich (JIRA)" <xe...@xml.apache.org>]

     [ https://issues.apache.org/jira/browse/XERCESJ-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Glavassevich resolved XERCESJ-1574.
-------------------------------------------

    Resolution: Fixed

There was some code reorganization around Xerces 2.9.1 which would have caused this. I've restored the old behaviour. Thanks for reporting. See SVN rev 1363647 for the fix.
                
> Problem with detected encoding for UTF-16 encoded as Unicode Little
> -------------------------------------------------------------------
>
>                 Key: XERCESJ-1574
>                 URL: https://issues.apache.org/jira/browse/XERCESJ-1574
>             Project: Xerces2-J
>          Issue Type: Bug
>          Components: DOM (Level 3 Core)
>    Affects Versions: 2.11.0
>            Reporter: Radu Coravu
>            Assignee: Michael Glavassevich
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> I have the following test case:
>     ByteArrayInputStream bis = new ByteArrayInputStream(
>           "<?xml version=\"1.0\" encoding=\"UTF-16\"?> <a/>".getBytes("UnicodeLittle"));
>     InputSource is = new InputSource(bis);
>     DOMParser dp = new DOMParser();
>     dp.parse(is);
>     assertEquals("UTF-16LE", dp.getDocument().getInputEncoding());
> The input stream is encoded as "UnicodeLittle" and " dp.getDocument().getInputEncoding()" should return "UTF-16LE" (at least it did so in the previous Xerces version). Right now it returns "UTF-16" regardless of the byte order mark in the input stream.
> So a developer using the information from "dp.getDocument().getInputEncoding()" information does not know how to save the document in order to preserve the same BOM.
> This problem is related to the modifications which were made in the XMLEntityManager related to encoding detection.
> As a proposed modification, in the method:
> org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(String, XMLInputSource, boolean, boolean)
> before the code:
> fCurrentEntity = new ScannedEntity(name,....
> we could add the following code:
>         if("UTF-16".equals(encoding)) {
>           if(isBigEndian != null) {
>             if(isBigEndian) {
>               encoding = "UTF-16BE"; 
>             } else {
>               encoding = "UTF-16LE";
>             }
>           }
>         }

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