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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3770) Create a utility class for skipping data in an InputStream
Date Wed, 09 Jul 2008 13:53:32 GMT
Create a utility class for skipping data in an InputStream
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                 Key: DERBY-3770
                 URL: https://issues.apache.org/jira/browse/DERBY-3770
             Project: Derby
          Issue Type: Improvement
          Components: Miscellaneous
    Affects Versions: 10.5.0.0
            Reporter: Kristian Waagan
            Priority: Minor


The contract of InputStream.skip is somewhat difficult, some would even say broken.
See http://java.sun.com/javase/6/docs/api/java/io/InputStream.html#skip(long))

A utility class should be created to ensure that we use the same skip procedure throughout
the Derby code base.
Suggested functionality:
 - long skipFully(InputStream) : skips until EOF, returns number of bytes skipped
 - void skipFully(InputStream,long) : skips requested number of bytes, throws EOFException
if there is too few bytes in the stream

I know of two different approaches, both skipping in a loop:
 a) Verify EOF with a read call when skip returns zero.
 b) Throw EOFException if skip returns zero before requested number of bytes have been skipped.

There's related code in iapi.util.UTF8Util. Maybe this class, say StreamUtil, could be put
in the same package?

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