cmp_icu.c

/**
 * @file   cmp_icu.c
 * @author Dominik Loidolt (dominik.loidolt@univie.ac.at)
 * @date   2020
 *
 * @copyright GPLv2
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * @brief software compression library
 * @see Data Compression User Manual PLATO-UVIE-PL-UM-0001
 *
 * To compress data, first create a compression configuration with the
 * cmp_cfg_icu_create() function.
 * Then set the different data buffers with the data to compressed, the model
 * data and the compressed data with the cmp_cfg_icu_buffers() function.
 * Then set the compression data type specific compression parameters. For
 * imagette data use the cmp_cfg_icu_imagette() function. For flux and center of
 * brightness data use the cmp_cfg_fx_cob() function. And for background, offset
 * and smearing data use the cmp_cfg_aux() function.
 * Finally, you can compress the data with the icu_compress_data() function.
 */


#include <stdint.h>
#include <string.h>
#include <limits.h>

#include "../common/byteorder.h"
#include "../common/cmp_debug.h"
#include "../common/cmp_data_types.h"
#include "../common/cmp_support.h"
#include "../common/cmp_entity.h"

#include "../cmp_icu.h"
#include "../cmp_chunk.h"


/**
 * @brief default implementation of the get_timestamp() function
 *
 * @returns 0
 */

static uint64_t default_get_timestamp(void)
{
	return 0;
}


/**
 * @brief function pointer to a function returning a current PLATO timestamp
 * initialised with the compress_chunk_init() function
 */

static uint64_t (*get_timestamp)(void) = default_get_timestamp;


/**
 * @brief holding the version_identifier for the compression header
 * initialised with the compress_chunk_init() function
 */

static uint32_t version_identifier;