Gets list of Bin index information.

The location of the first offset in this file for a read from this index

Does this read have meta data associated with it? (number of mapped/unmapped reads?) Note that the meta-data is not standardized yet across implementations

The location of the last offset in this file for a read from this index.

Gets list of Linear file offsets. An array holding the linear offsets to be output

Count of the number of mapped reads, may be inferred from index file.

Count of the number of unmapped reads (Typically those where a read does not align to a reference but its mate does, though this is not guaranteed).