hdf5_ep

      /*

       * Read the aligned data in file into aligned buffer first, then copy the data

       * into the final buffer.  If the data size is bigger than maximal copy buffer

       * size, do the reading by segment (the outer while loop).  If not, do one step

       * reading.

       */

      do {

         /* Read the aligned data in file first.  Not able to handle interrupted

     * system calls and partial results like sec2 driver does because the

     * file is smaller than ALLOC_SIZE. */

        HDmemset(copy_buf, 0, alloc_size);

​

                /* Calculate how much data we have to read in this iteration

                 * (including unused parts of blocks) */

                if((copy_size + copy_offset) < alloc_size)

                    read_size = ((copy_size + copy_offset - 1) / _fbsize + 1)

                            * _fbsize;

                else

                    read_size = alloc_size;

                 * (including unused parts of blocks) */

                if((copy_size + copy_offset) < alloc_size)

                    write_size = ((copy_size + copy_offset - 1) / _fbsize + 1)

                            * _fbsize;

                else

                    write_size = alloc_size;

​

        /*

          * Read the aligned data first if the aligned region doesn't fall

     * system calls and partial results like sec2 driver does because the

     * file is smaller than ALLOC_SIZE.  Only read the entire section if

                 * both ends are misaligned, otherwise only read the block on the

                 * misaligned end.

         */

        HDmemset(copy_buf, 0, _fbsize);

​

                if(copy_offset > 0) {

                    if((write_addr + write_size) > (addr + size)) {

                        HDassert((write_addr + write_size) - (addr + size) < _fbsize);

                        read_size = write_size;