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https://issues.apache.org/jira/browse/COMPRESS-174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214199#comment-13214199
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Sebb commented on COMPRESS-174:
-------------------------------
The method CompressorStreamFactory.createCompressorInputStream(InputStream) can
be used to autodetect the compression type.
> BZip2CompressorInputStream doesn't handle being given a wrong-format
> compressed file
> ------------------------------------------------------------------------------------
>
> Key: COMPRESS-174
> URL: https://issues.apache.org/jira/browse/COMPRESS-174
> Project: Commons Compress
> Issue Type: Bug
> Components: Compressors
> Affects Versions: 1.3
> Environment: Linux and Windows
> Reporter: Andrew Pavlin
> Priority: Minor
>
> When reading a file through BZip2CompressorInputStream, and the user selects
> a file of the wrong type (such as ZIP or GZIP), the read blows up with a
> strange ArrayIndexOutOfBoundException, instead of reporting immediately that
> the input data is of the wrong format.
> The Bzip2Compressor should be able to identify whether a stream is of BZip2
> format or not, and immediately reject it with a meaningful exception
> (example: "ProtocolException: not a BZip2 compressed file").
> Alternatively, are there functions in commons-compress that can identify the
> compression type of an InputStream by inspection?
> Example stack trace when using a ZIP input file:
> Exception in thread "OSM Decompressor"
> java.lang.ArrayIndexOutOfBoundsException: 900000
> at
> org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream.getAndMoveToFrontDecode(BZip2CompressorInputStream.java:688)
>
> at
> org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream.initBlock(BZip2CompressorInputStream.java:322)
>
> at
> org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream.setupNoRandPartA(BZip2CompressorInputStream.java:880)
>
> at
> org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream.setupNoRandPartB(BZip2CompressorInputStream.java:936)
>
> at
> org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream.read0(BZip2CompressorInputStream.java:228)
>
> at
> org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream.read(BZip2CompressorInputStream.java:180)
>
> at java.io.InputStream.read(InputStream.java:82)
> at
> org.ka2ddo.yaac.osm.OsmXmlSegmenter$1.run(OsmXmlSegmenter.java:129)
> at java.lang.Thread.run(Thread.java:680)
>
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