org.autoplot.hapi.AbstractBinaryRecordReader
read data record-by-record, so the client doesn't need to worry if the file
 is local or coming from the network.
readRecord
readRecord( java.nio.ByteBuffer buf ) → int
read data to fill the buffer, or return null if no more data
 is available.
Parameters
buf - a ByteBuffer
Returns:
the number of bytes read, which will be the length of the buffer or -1.
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