vchoi_fork

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 * Copyright by the Board of Trustees of the University of Illinois.         *

 * All rights reserved.                                                      *

 *                                                                           *

 * This file is part of HDF5.  The full HDF5 copyright notice, including     *

 * terms governing use, modification, and redistribution, is contained in    *

 * the files COPYING and Copyright.html.  COPYING can be found at the root   *

 * of the source code distribution tree; Copyright.html can be found at the  *

 * root level of an installed copy of the electronic HDF5 document set and   *

 * is linked from the top-level documents page.  It can also be found at     *

 * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *

 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *

 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

​

/*

 * Programmer:  Saurabh Bagchi (bagchi@uiuc.edu)

 *              Thursday, August 12 -Tuesday, August 17, 1999

 *

 * Purpose: This is the GASS I/O driver.

 *

 */

#include "H5private.h"      /*library functions         */

#include "H5Eprivate.h"     /*error handling            */

#include "H5Fprivate.h"     /*files                 */

#include "H5FDprivate.h"    /*file driver                 */

#include "H5FDgass.h"           /* Core file driver */

#include "H5Iprivate.h"     /*object IDs                  */

#include "H5MMprivate.h"        /* Memory allocation */

#include "H5Pprivate.h"     /*property lists            */

​

#ifdef H5_HAVE_GASS

​

/* The driver identification number, initialized at runtime */

static hid_t H5FD_GASS_g = 0;

​

/* File operations */

#define OP_UNKNOWN  0

#define OP_READ     1

#define OP_WRITE    2

​

/*

 * The description of a file belonging to this driver. The `eoa' and `eof'

 * determine the amount of hdf5 address space in use and the high-water mark

 * of the file (the current size of the underlying Unix file). The `pos'

 * value is used to eliminate file position updates when they would be a

 * no-op. Unfortunately we've found systems that use separate file position

 * indicators for reading and writing so the lseek can only be eliminated if

 * the current operation is the same as the previous operation.  When opening

 * a file the `eof' will be set to the current file size, `eoa' will be set

 * to zero, `pos' will be set to H5F_ADDR_UNDEF (as it is when an error

 * occurs), and `op' will be set to H5F_OP_UNKNOWN.