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https://issues.apache.org/jira/browse/DERBY-2686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan closed DERBY-2686.
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> The skip method for some InputStreams and Readers return invalid values
> -----------------------------------------------------------------------
>
> Key: DERBY-2686
> URL: https://issues.apache.org/jira/browse/DERBY-2686
> Project: Derby
> Issue Type: Bug
> Components: JDBC, Store
> Affects Versions: 10.3.0.0
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Fix For: 10.3.0.0
>
> Attachments: derby-2686-1a.diff, derby-2686-1a.stat,
> derby-2686-2a-reader.diff, derby-2686-2a-reader.stat, derby-2686-3a.diff,
> derby-2686-3a.stat
>
>
> The Java API docs for InputStream.skip and Reader.skip seem to indicate that
> returning a negative value is breaking the contract.
> The contract for Reader.skip is the more clear one, while I have taken the
> assumption that all Derby InputStreams will return 0 only when EOF has been
> reached or 0 is passed in as the amount of bytes to skip.
> Bad checking in a skip method also caused Derby to enter an infinite loop in
> a skip method.
> It should also be noted that skipping bytes/characters should be done in a
> loop, as skip is free to skip a smaller amount of bytes than requested. This
> is true even if EOF is not reached.
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