If the entry uses a data descriptor, size information is only available after trying to read the next entry.  This doesn't help the jar case as Java7's jar doesn't implement the spec correctly, will file a bug report with OpenJDK and ponder whether a work-around is possible.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1152725 13f79535-47bb-0310-9956-ffa450edef68
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