1. Elena Pourmal
  2. hdf5_ep

Source

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 
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 * Copyright by The HDF Group.                                               *
 
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 * All rights reserved.                                                      *
 
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 *                                                                           *
 
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 * This file is part of HDF5. The full HDF5 copyright notice, including      *
 
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 * terms governing use, modification, and redistribution, is contained in    *
 
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 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 
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 * of the source code distribution tree; Copyright.html can be found at the  *
 
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 * root level of an installed copy of the electronic document set and is     *
 
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 * linked from the top-level documents page.  It can also be found at        *
 
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 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have access   *
 
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 * to either file, you may request a copy from help@hdfgroup.org.            *
 
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 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
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/*
 
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 * Purpose:    Tests the plugin module (H5PL)
 
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 */
 
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​
 
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#include <stdlib.h>
 
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#include <stdio.h>
 
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#include "H5PLextern.h"
 
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​
 
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#define H5Z_FILTER_DYNLIB4      260
 
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​
 
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#define PUSH_ERR(func, minor, str) H5Epush2(H5E_DEFAULT, __FILE__, func, __LINE__, H5E_ERR_CLS, H5E_PLUGIN, minor, str)
 
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​
 
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static size_t H5Z_filter_dynlib4(unsigned int flags, size_t cd_nelmts,
 
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                const unsigned int *cd_values, size_t nbytes, size_t *buf_size, void **buf);
 
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​
 
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/* This message derives from H5Z */
 
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const H5Z_class2_t H5Z_DYNLIB4[1] = {{
 
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    H5Z_CLASS_T_VERS,                /* H5Z_class_t version             */
 
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    H5Z_FILTER_DYNLIB4,             /* Filter id number        */
 
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    1, 1,                            /* Encoding and decoding enabled   */
 
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    "dynlib4",                 /* Filter name for debugging    */
 
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    NULL,                            /* The "can apply" callback        */
 
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    NULL,                            /* The "set local" callback        */
 
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    (H5Z_func_t)H5Z_filter_dynlib4,    /* The actual filter function    */
 
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}};
 
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​
 
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H5PL_type_t   H5PLget_plugin_type(void) {return H5PL_TYPE_FILTER;}
 
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const void    *H5PLget_plugin_info(void) {return H5Z_DYNLIB4;}
 
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​
 
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/*-------------------------------------------------------------------------
 
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 * Function:    H5Z_filter_dynlib4
 
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 *
 
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 * Purpose:    A dynlib4 filter method that adds on and subtract from
 
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 *              the original value with another value.  It will be built
 
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 *              as a shared library.  plugin.c test will load and use
 
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 *              this filter library. Designed to call a HDF function.
 
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 *
 
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 * Return:    Success:    Data chunk size
 
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 *
 
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 *        Failure:    0
 
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 *
 
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 *-------------------------------------------------------------------------
 
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 */
 
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static size_t
 
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H5Z_filter_dynlib4(unsigned int flags, size_t cd_nelmts,
 
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      const unsigned int *cd_values, size_t nbytes,
 
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      size_t *buf_size, void **buf)
 
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{
 
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    int *int_ptr = (int *)*buf;          /* Pointer to the data values */
 
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    size_t buf_left = *buf_size;  /* Amount of data buffer left to process */
 
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    int add_on = 0;
 
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    unsigned ver_info[3];
 
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​
 
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    /* Check for the library version */
 
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    if(H5get_libversion(&ver_info[0], &ver_info[1], &ver_info[2]) < 0) {
 
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        PUSH_ERR("dynlib4", H5E_CALLBACK, "H5get_libversion");
 
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        return(0);
 
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    }
 
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    /* Check for the correct number of parameters */
 
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    if(cd_nelmts == 0)
 
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        return(0);
 
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​
 
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    /* Check that permanent parameters are set correctly */
 
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    if(cd_values[0] > 9)
 
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        return(0);
 
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​
 
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    if(ver_info[0] != cd_values[1] || ver_info[1] != cd_values[2]) {
 
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        PUSH_ERR("dynlib4", H5E_CALLBACK, "H5get_libversion does not match");
 
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        return(0);
 
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    }
 
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​
 
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    add_on = (int)cd_values[0];
 
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​
 
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    if(flags & H5Z_FLAG_REVERSE) { /*read*/
 
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        /* Substract the "add on" value to all the data values */
 
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        while(buf_left > 0) {
 
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            *int_ptr++ -= add_on;
 
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            buf_left -= sizeof(int);
 
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        } /* end while */
 
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    } /* end if */
 
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    else { /*write*/
 
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        /* Add the "add on" value to all the data values */
 
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        while(buf_left > 0) {
 
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            *int_ptr++ += add_on;
 
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            buf_left -= sizeof(int);
 
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        } /* end while */
 
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    } /* end else */
 
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​
 
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    return nbytes;
 
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} /* end H5Z_filter_dynlib4() */
 
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​