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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.
* This filter makes an HDF5 API call to ensure that works correctly.
*/
#include <stdlib.h>
#include <stdio.h>
#include "H5PLextern.h"
#define FILTER3_ID 259
#define PUSH_ERR(func, minor, str) \
H5Epush2(H5E_DEFAULT, __FILE__, func, __LINE__, H5E_ERR_CLS, H5E_PLUGIN, minor, str)
static size_t add_sub_value_hdf5(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 */
FILTER3_ID, /* Filter ID number */
1, /* Encoding enabled */
1, /* Decoding enabled */
"test filter plugin 3", /* Filter name for debugging */
NULL, /* The "can apply" callback */
NULL, /* The "set local" callback */
add_sub_value_hdf5, /* 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_hdf5
*
* Purpose: On write:
* Adds a caller-supplied value to the element
* On read:
* Subtracts a caller-supplied value from the element
*
* NOTE: This filter is identical to filter #1 only it makes
* an HDF5 library call to ensure doing that doesn't
* cause problems.
*
* Return: Success: Data chunk size in bytes
* Failure: 0
*
*-------------------------------------------------------------------------
*/
static size_t
add_sub_value_hdf5(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 */
unsigned majnum = 0; /* Output data from the HDF5 library call */
unsigned minnum = 0;
unsigned relnum = 0;
/* Check for the library version.
* We don't do anything with this information - it's just to ensure that
* HDF5 library calls work properly from inside filter plugins.
*/
if (H5get_libversion(&majnum, &minnum, &relnum) < 0) {
PUSH_ERR("filter plugin 3", H5E_CALLBACK, "H5get_libversion");
return 0;
}
/* Check for the correct number of parameters */
if (cd_nelmts == 0)
return 0;
/* Check that permanent parameters are set correctly */
if (cd_values[0] > 9)
return 0;
/* Ensure that the version numbers match what was passed in.
* Again, this is trivial work, just to ensure that the library calls are
* working properly.
*/
if (majnum != cd_values[1] || minnum != cd_values[2]) {
PUSH_ERR("filter plugin 3", H5E_CALLBACK, "library versions do not match");
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_hdf5() */
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