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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2686) The skip method for some InputStreams and Readers return invalid values
Date Wed, 23 May 2007 21:44:16 GMT
The skip method for some InputStreams and Readers return invalid values
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                 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
         Assigned To: Kristian Waagan


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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