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package uk.ac.bristol.star.cdf.record;
import java.io.IOException;
/**
* Field data for CDF record of type Unused Internal Record.
*
* @author Mark Taylor
* @since 19 Jun 2013
*/
public class UnusedInternalRecord extends Record {
@CdfField @OffsetField public final long nextUir;
@CdfField @OffsetField public final long prevUir;
/**
* Constructor.
*
* @param plan basic record information
*/
public UnusedInternalRecord( RecordPlan plan ) throws IOException {
super( plan, "UIR", -1 );
Buf buf = plan.getBuf();
Pointer ptr = plan.createContentPointer();
int planHeaderSize = (int) plan.getReadCount( ptr );
// This UIR may be unsociable and too small to contain UIR fields.
// If so, don't attempt to read them (if we are extremely unlucky
// they might be off the end of the file). Check the record size
// is large enough to accommodate these fields before reading them.
int pointerSize = buf.isBit64() ? 8 : 4;
int sociableUirSize = planHeaderSize + 2 * pointerSize;
if ( plan.getRecordSize() >= sociableUirSize ) {
this.nextUir = buf.readOffset( ptr );
this.prevUir = buf.readOffset( ptr );
}
else { // too small to be sociable
this.nextUir = -1L;
this.prevUir = -1L;
}
}
}
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