Unsafe use of DataInput.skipBytes() in StoredPage and StoredFieldHeader
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Key: DERBY-3941
URL: https://issues.apache.org/jira/browse/DERBY-3941
Project: Derby
Issue Type: Bug
Components: Newcomer, Store
Reporter: Knut Anders Hatlen
Priority: Minor
Some methods in StoredFileHeader and StoredPage call
java.io.DataInput.skipBytes(int) with the assumption that it always skips the
requested number of bytes. According to the javadoc for skipBytes, it may skip
fewer bytes than requested, possibly 0, even if the end of the stream hasn't
been reached.
The problem exists in these methods:
StoredFieldHeader.readFieldDataLength()
StoredPage.readRecordFromStream()
StoredPage.skipField()
StoredPage.readOneColumnFromPage()
StoredPage.readRecordFromArray()
We should change the code so that it works correctly even if skipBytes() were
to skip fewer bytes than requested.
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