[jira] Resolved: (DERBY-3735) Incorrect position calculation in PositionedStoreStream with read(byte[],...)

["Kristian Waagan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-3735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kristian Waagan resolved DERBY-3735.
------------------------------------

       Resolution: Fixed
    Fix Version/s: 10.3.3.1

Backported fix to the 10.3 branch with revision 673064.
Tests ran without failures.

This concludes the work on this issue.

> Incorrect position calculation in PositionedStoreStream with read(byte[],...)
> -----------------------------------------------------------------------------
>
>                 Key: DERBY-3735
>                 URL: https://issues.apache.org/jira/browse/DERBY-3735
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Store
>    Affects Versions: 10.3.1.4, 10.4.1.3, 10.5.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>             Fix For: 10.3.3.1, 10.4.1.4, 10.5.0.0
>
>         Attachments: derby-3735-1a.diff, derby-3735-1a.stat, derby-3735-1b.diff, derby-3735-2a.diff
>
>
> A bug in the methods 'read(byte[])' and 'read(byte[],int,int)' in PositionedStoreStream can cause the position variable to be set to an incorrect value.
> The bug is only triggered if one of the two read methods is invoked after EOF of the underlying stream has been reached.
> If the bug is triggered, the position will be decreased by one because the underlying stream returns -1. Subsequent reads will further decrease the position. This can cause EOF-exceptions (during repositioning) or incorrect data being returned in subsequent calls.

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