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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: Test dataset filter plugin for the filter_pluging.c test.
*/
#include <stdlib.h>
#include <stdio.h>
#include "H5PLextern.h"
#define FILTER1_ID 257
static size_t add_sub_value(unsigned int flags, size_t cd_nelmts, const unsigned int *cd_values,
size_t nbytes, size_t *buf_size, void **buf);
/* Filter class struct */
const H5Z_class2_t FILTER_INFO[1] = {{
H5Z_CLASS_T_VERS, /* H5Z_class_t version */
FILTER1_ID, /* Filter ID number */
1, /* Encoding enabled */
1, /* Decoding enabled */
"test filter plugin 1", /* Filter name for debugging */
NULL, /* The "can apply" callback */
NULL, /* The "set local" callback */
add_sub_value, /* The actual filter function */
}};
H5PL_type_t
H5PLget_plugin_type(void)
{
return H5PL_TYPE_FILTER;
}
const void *
H5PLget_plugin_info(void)
{
return FILTER_INFO;
}
/*-------------------------------------------------------------------------
* Function: add_sub_value
*
* Purpose: On write:
* Adds a caller-supplied value to the element
* On read:
* Subtracts a caller-supplied value from the element
*
* Return: Success: Data chunk size in bytes
* Failure: 0
*
*-------------------------------------------------------------------------
*/
static size_t
add_sub_value(unsigned int flags, size_t cd_nelmts, const unsigned int *cd_values, size_t nbytes,
size_t *buf_size, void **buf)
{
int *int_ptr = (int *)*buf; /* Pointer to the data values */
size_t buf_left = *buf_size; /* Amount of data buffer left to process */
int value = 0; /* Data value to add/subtract */
/* Check for the correct number of parameters */
if (0 == cd_nelmts)
return 0;
/* Check that permanent parameters are set correctly */
if (cd_values[0] > 9)
return 0;
value = (int)cd_values[0];
if (flags & H5Z_FLAG_REVERSE) {
/* READ - Subtract the given value from all the data values */
while (buf_left > 0) {
*int_ptr++ -= value;
buf_left -= sizeof(int);
}
}
else {
/* WRITE - Add the given value to all the data values */
while (buf_left > 0) {
*int_ptr++ += value;
buf_left -= sizeof(int);
}
}
return nbytes;
} /* end add_sub_value() */
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