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Date: Thu, 20 Jan 2011 05:10:44 -0500 (EST)
From: "Robert Lichtenberger (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Created: (COMPRESS-125) BZip2CompressorInputStream throws
 IOException if underlying stream returns available() == 0
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BZip2CompressorInputStream throws IOException if underlying stream returns available() == 0
-------------------------------------------------------------------------------------------

                 Key: COMPRESS-125
                 URL: https://issues.apache.org/jira/browse/COMPRESS-125
             Project: Commons Compress
          Issue Type: Bug
          Components: Compressors
    Affects Versions: 1.1
            Reporter: Robert Lichtenberger
            Priority: Minor


BzipCompressorInput,init() will throw an IOException, if the passed stream returns 0 for available():
{code:title=BzipCompressorInput,.java|borderStyle=solid}
    private void init() throws IOException {
        ...
        if (in.available() == 0) {
            throw new IOException("Empty InputStream");
        }
        ...
     }
{code} 

I think this is not correct, because the underlying stream may indeed be able to only return 0 bytes without blocking but may be able to block a little and then return some more bytes.
Note also the change in the API documentation from: "Returns the number of bytes that can be read " (1.4.2) to "Returns an estimate of the number of bytes that can be read".


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