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From "Borys Zibrov (JIRA)" <>
Subject [jira] [Created] (IO-537) BOMInputStream shouldn't sort array of BOMs in-place
Date Sat, 03 Jun 2017 10:26:04 GMT
Borys Zibrov created IO-537:

             Summary: BOMInputStream shouldn't sort array of BOMs in-place
                 Key: IO-537
             Project: Commons IO
          Issue Type: Improvement
          Components: Streams/Writers
    Affects Versions: 2.5, 2.4
         Environment: OS: Ubuntu 16.04
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

            Reporter: Borys Zibrov

BOMInputStream constructor code sorts array of BOMs to distinguish between UTF-32LE and UTF-16LE:
    public BOMInputStream(InputStream delegate, boolean include, ByteOrderMark... boms) {
        if (boms == null || boms.length == 0) {
            throw new IllegalArgumentException("No BOMs specified");
        this.include = include;
        // Sort the BOMs to match the longest BOM first because some BOMs have the same starting
two bytes.
        Arrays.sort(boms, ByteOrderMarkLengthComparator);
        this.boms = Arrays.asList(boms);


The problem is the array is sorted in-place so that's 1) not expected by the caller 2) makes
code not safe, if array is shared between threads and all create BOMInputStreams with single
array of BOMs results are unpredictable

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