[COMPRESS-125] BZip2CompressorInputStream throws IOException if underlying stream returns available() == 0

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.1
• Fix Version/s: 1.2
• Component/s: Compressors
• Assignee: Unassigned
• Reporter: Robert Lichtenberger
• Created: 20/Jan/11 10:08
• Updated: 23/Mar/11 11:18
• Resolved: 23/Mar/11 11:18

Description

BZip2CompressorInputStream,init() will throw an IOException, if the passed stream returns 0 for available():

BZip2CompressorInputStream.java

    private void init() throws IOException {
        ...
        if (in.available() == 0) {
            throw new IOException("Empty InputStream");
        }
        ...
     }

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".