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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3735) Incorrect position calculation in PositionedStoreStream with read(byte[],...)
Date Thu, 26 Jun 2008 10:04:45 GMT

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

Kristian Waagan updated DERBY-3735:
-----------------------------------

    Attachment: derby-3735-1b.diff

Thanks for the review Knut Anders.

Committed 'derby-3735-1b.diff' to trunk with revision 671840.
Will backport to 10.4 and maybe 10.3.

Made a revision b of the patch due to a conflicting change in _Suite, and also addressed Knut
Anders' nit (both methods now use the same condition).

> 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
>         Attachments: derby-3735-1a.diff, derby-3735-1a.stat, derby-3735-1b.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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