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90 lines
3.6 KiB
C
90 lines
3.6 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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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 COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
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* If you do not have access to either file, you may request a copy from *
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* 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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#include <stdlib.h>
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#include <stdio.h>
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#include "H5PLextern.h"
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#define H5Z_FILTER_DYNLIBUD 300
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#define MULTIPLIER 3
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static size_t H5Z_filter_dynlibud(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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/* This message derives from H5Z */
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const H5Z_class2_t H5Z_DYNLIBUD[1] = {{
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H5Z_CLASS_T_VERS, /* H5Z_class_t version */
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H5Z_FILTER_DYNLIBUD, /* Filter id number */
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1, 1, /* Encoding and decoding enabled */
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"dynlibud", /* 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_dynlibud, /* The actual filter function */
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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_DYNLIBUD;}
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/*-------------------------------------------------------------------------
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* Function: H5Z_filter_dynlibud
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*
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* Purpose: A dynlib2 filter method that multiplies the original value
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* during write and divide the original value during read. It
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* will be built as a shared library. plugin.c test will load
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* and use this filter library.
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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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static size_t
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H5Z_filter_dynlibud(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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char *int_ptr = (char *)*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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/* 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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/* Assignment to eliminate unused parameter warning. */
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cd_values = cd_values;
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if(flags & H5Z_FLAG_REVERSE) { /*read*/
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/* Subtract the original value with MULTIPLIER */
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while(buf_left > 0) {
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char temp = *int_ptr;
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*int_ptr = (int8_t)(temp - MULTIPLIER);
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int_ptr++;
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buf_left -= sizeof(*int_ptr);
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} /* end while */
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} /* end if */
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else { /*write*/
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/* Add the original value with MULTIPLIER */
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while(buf_left > 0) {
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char temp = *int_ptr;
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*int_ptr = (int8_t)(temp + MULTIPLIER);
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int_ptr++;
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buf_left -= sizeof(*int_ptr);
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} /* end while */
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} /* end else */
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return nbytes;
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} /* end H5Z_filter_dynlibud() */
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