[jira] [Created] (COMPRESS-334) ArArchiveInputStream.getBSDLongName does increment offset

["Jeremy Gustie (JIRA)" <ji...@apache.org>]

Jeremy Gustie created COMPRESS-334:
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             Summary: ArArchiveInputStream.getBSDLongName does increment offset
                 Key: COMPRESS-334
                 URL: https://issues.apache.org/jira/browse/COMPRESS-334
             Project: Commons Compress
          Issue Type: Bug
          Components: Archivers
    Affects Versions: 1.10
            Reporter: Jeremy Gustie


I have an AR archive which uses the BSD long name convention and I cannot read past the first entry without failing.

I dug into the issue and it appears the problem is with {{getBSDLongName}} which calls {{readFully}} with the underlying stream:

{code}
int read = IOUtils.readFully(input, name);
count(read);
{code}

This does not increment the {{offset}} which is later used by {{read(byte[], int, int)}} to compute the value of {{toRead}}. Since {{offset}} is too small, {{toRead}} ends up too big and the first entry contents end up pulling in the first {{n}} bytes of the next entry header ({{n}} is the BSD long name length).

I think this can be addressed by adding {{offset += read}} or changing the above code to just:
{code}
int read = IOUtils.readFully(this, name);
{code}

(Sorry for posting code in the ticket, I will try and get an environment set up so I can start submitting patches).



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