vchoi_fork

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

 * Copyright by The HDF Group.                                               *

 * 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 COPYING file, which can be found at the root of the source code       *

 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *

 * If you do not have access to either file, you may request a copy from     *

 * help@hdfgroup.org.                                                        *

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

​

#include "H5Zmodule.h"          /* This source code file is part of the H5Z module */

​

#include "H5private.h"        /* Generic Functions            */

#include "H5ACprivate.h"    /* Metadata cache            */

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

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

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

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

#include "H5Oprivate.h"         /* Object headers                       */

#include "H5Sprivate.h"        /* Dataspaces                     */

#include "H5Tprivate.h"        /* Datatypes                     */

#include "H5Zpkg.h"        /* Data filters                */

​

/* Struct of parameters needed for compressing/decompressing one atomic datatype */

typedef struct {

   unsigned size;      /* datatype size */

   uint32_t minbits;   /* minimum bits to compress one value of such datatype */

   unsigned mem_order; /* current memory endianness order */

} parms_atomic;

​

enum H5Z_scaleoffset_t {t_bad=0, t_uchar=1, t_ushort, t_uint, t_ulong, t_ulong_long,

                           t_schar, t_short, t_int, t_long, t_long_long,

                           t_float, t_double};

​

/* Local function prototypes */

static htri_t H5Z_can_apply_scaleoffset(hid_t dcpl_id, hid_t type_id, hid_t space_id);

static enum H5Z_scaleoffset_t H5Z_scaleoffset_get_type(unsigned dtype_class,

    unsigned dtype_size, unsigned dtype_sign);

static herr_t H5Z_scaleoffset_set_parms_fillval(H5P_genplist_t *dcpl_plist,

    H5T_t *type, enum H5Z_scaleoffset_t scale_type, unsigned cd_values[],

    int need_convert);

static herr_t H5Z_set_local_scaleoffset(hid_t dcpl_id, hid_t type_id, hid_t space_id);

static size_t H5Z_filter_scaleoffset(unsigned flags, size_t cd_nelmts,

    const unsigned cd_values[], size_t nbytes, size_t *buf_size, void **buf);

static void H5Z_scaleoffset_convert(void *buf, unsigned d_nelmts, unsigned dtype_size);

static H5_ATTR_CONST unsigned H5Z_scaleoffset_log2(unsigned long long num);

static void H5Z_scaleoffset_precompress_i(void *data, unsigned d_nelmts,

    enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[],