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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