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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* 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://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Purpose: Tests the plugin module (H5PL)
*/
#include <stdlib.h>
#include <stdio.h>
#include "H5PLextern.h"
#define H5Z_FILTER_DYNLIBUD 300
#define MULTIPLIER 3
static size_t H5Z_filter_dynlibud(unsigned int flags, size_t cd_nelmts, const unsigned int *cd_values,
size_t nbytes, size_t *buf_size, void **buf);
/* This message derives from H5Z */
const H5Z_class2_t H5Z_DYNLIBUD[1] = {{
H5Z_CLASS_T_VERS, /* H5Z_class_t version */
H5Z_FILTER_DYNLIBUD, /* Filter id number */
1, 1, /* Encoding and decoding enabled */
"dynlibud", /* Filter name for debugging */
NULL, /* The "can apply" callback */
NULL, /* The "set local" callback */
(H5Z_func_t)H5Z_filter_dynlibud, /* The actual filter function */
}};
H5PL_type_t
H5PLget_plugin_type(void)
{
return H5PL_TYPE_FILTER;
}
const void *
H5PLget_plugin_info(void)
{
return H5Z_DYNLIBUD;
}
/*-------------------------------------------------------------------------
* Function: H5Z_filter_dynlibud
*
* Purpose: A dynlib2 filter method that multiplies the original value
* during write and divide the original value during read. It
* will be built as a shared library. plugin.c test will load
* and use this filter library.
*
* Return: Success: Data chunk size
*
* Failure: 0
*-------------------------------------------------------------------------
*/
static size_t
H5Z_filter_dynlibud(unsigned int flags, size_t cd_nelmts, const unsigned int *cd_values, size_t nbytes,
size_t *buf_size, void **buf)
{
char * int_ptr = (char *)*buf; /* Pointer to the data values */
size_t buf_left = *buf_size; /* Amount of data buffer left to process */
/* Check for the correct number of parameters */
if (cd_nelmts > 0)
return (0);
/* Assignment to eliminate unused parameter warning. */
cd_values = cd_values;
if (flags & H5Z_FLAG_REVERSE) { /*read*/
/* Subtract the original value with MULTIPLIER */
while (buf_left > 0) {
char temp = *int_ptr;
*int_ptr = temp - MULTIPLIER;
int_ptr++;
buf_left -= sizeof(*int_ptr);
} /* end while */
} /* end if */
else { /*write*/
/* Add the original value with MULTIPLIER */
while (buf_left > 0) {
char temp = *int_ptr;
*int_ptr = temp + MULTIPLIER;
int_ptr++;
buf_left -= sizeof(*int_ptr);
} /* end while */
} /* end else */
return nbytes;
} /* end H5Z_filter_dynlibud() */
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