question: private static Pair < Long , Long > load ( ByteArray a , InputStream stream , long memoryOffset , long count , CommonIndex positions , CRC32 checksum , ByteArray checksums , PrereadHashFunction hf , boolean checksumsLoaded , long currentSeq ) throws IOException { long tmpCurrentSeq = currentSeq ; final byte [ ] buffer = new byte [ 1024 * 1024 ] ; long totalRead = 0 ; int bytesRead ; long pos = memoryOffset ; while ( totalRead < count && ( bytesRead = stream . read ( buffer , 0 , ( int ) Math . min ( count - totalRead , buffer . length ) ) ) != - 1 ) { a . set ( pos , buffer , bytesRead ) ; pos += bytesRead ; int j = 0 ; while ( j < bytesRead ) { if ( positions . get ( tmpCurrentSeq + 1 ) == positions . get ( tmpCurrentSeq ) ) { hf . irvineHash ( 0L ) ; tmpCurrentSeq ++ ; continue ; } final int len = ( int ) ( positions . get ( tmpCurrentSeq + 1 ) - ( memoryOffset + totalRead + j ) ) ; if ( j + len <= bytesRead ) { checksum . update ( buffer , j , len ) ; hf . irvineHash ( buffer , j , len ) ; hf . irvineHash ( positions . get ( tmpCurrentSeq + 1 ) - positions . get ( tmpCurrentSeq ) ) ; if ( checksumsLoaded ) { if ( ( byte ) checksum . getValue ( ) != checksums . get ( tmpCurrentSeq ) ) { throw new CorruptSdfException ( "Sequence: " + tmpCurrentSeq + " failed checksum" ) ; } } else { checksums . set ( tmpCurrentSeq , ( byte ) checksum . getValue ( ) ) ; } tmpCurrentSeq ++ ; checksum . reset ( ) ; } else { hf . irvineHash ( buffer , j , bytesRead - j ) ; checksum . update ( buffer , j , bytesRead - j ) ; } j += len ; } totalRead += bytesRead ; } return new Pair < > ( totalRead , tmpCurrentSeq ) ; }
target:  A private method for loading from a file, then compressing and calculating checksums 