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package uk.ac.bristol.star.cdf.record;
/**
* Records basic information about the position, extent and type of
* a CDF record.
*
* @author Mark Taylor
* @since 18 Jun 2013
*/
public class RecordPlan {
private final long start_;
private final long recSize_;
private final int recType_;
private final Buf buf_;
/**
* Constructor.
*
* @param start offset into buffer of record start
* @param recSize number of bytes comprising record
* @param recType integer record type field
* @param buf buffer containing record bytes
*/
public RecordPlan( long start, long recSize, int recType, Buf buf ) {
start_ = start;
recSize_ = recSize;
recType_ = recType;
buf_ = buf;
}
/**
* Returns the size of the record in bytes.
*
* @return record size
*/
public long getRecordSize() {
return recSize_;
}
/**
* Returns the type code identifying what kind of CDF record it is.
*
* @return record type
*/
public int getRecordType() {
return recType_;
}
/**
* Returns the buffer containing the record data.
*
* @return buffer
*/
public Buf getBuf() {
return buf_;
}
/**
* Returns a pointer initially pointing at the first content byte of
* the record represented by this plan.
* This is the first item after the RecordSize and RecordType items
* that always appear first in a CDF record, and whose values are
* known by this object.
*
* @return pointer pointing at the start of the record-type-specific
* content
*/
public Pointer createContentPointer() {
long pos = start_;
pos += buf_.isBit64() ? 8 : 4; // record size
pos += 4; // record type
return new Pointer( pos );
}
/**
* Returns the number of bytes in this record read (or skipped) by the
* current state of a given pointer.
*
* @param ptr pointer
* @return number of bytes between record start and pointer value
*/
public long getReadCount( Pointer ptr ) {
return ptr.get() - start_;
}
}
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