samples/compression/lz4/src/main.c

/*
 * Copyright (c) 2020 Linumiz
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <stdio.h>
#include <zephyr/kernel.h>
#include <string.h>
#include <stdlib.h>
#include "lz4.h"

void main(void)
{
	static const char *src = "Lorem ipsum dolor sit amet, consectetur "
	"adipiscing elit. Quisque sodales lorem lorem, sed congue enim "
	"vehicula a. Sed finibus diam sed odio ultrices pharetra. Nullam "
	"dictum arcu ultricies turpis congue,vel venenatis turpis venenatis. "
	"Nam tempus arcu eros, ac congue libero tristique congue. Proin velit "
	"lectus, euismod sit amet quam in, maximus condimentum urna. Cras vel "
	"erat luctus, mattis orci ut, varius urna. Nam eu lobortis velit."
	"\n"
	"Nullam sit amet diam vel odio sodales cursus vehicula eu arcu. Proin "
	"fringilla, enim nec consectetur mollis, lorem orci interdum nisi, "
	"vitae suscipit nisi mauris eu mi. Proin diam enim, mollis ac rhoncus "
	"vitae, placerat et eros. Suspendisse convallis, ipsum nec rhoncus "
	"aliquam, ex augue ultrices nisl, id aliquet mi diam quis ante. "
	"Pellentesque venenatis ornare ultrices. Quisque et porttitor lectus. "
	"Ut venenatis nunc et urna imperdiet porttitor non laoreet massa."
	"Donec eleifend eros in mi sagittis egestas. Sed et mi nunc. Nunc "
	"vulputate,mauris non ullamcorper viverra, lorem nulla vulputate "
	"diam, et congue dui velit non erat. Duis interdum leo et ipsum "
	"tempor consequat. In faucibus enim quis purus vulputate nullam."
	"\n";

	const int src_size = (int)(strlen(src) + 1);
	const int max_dst_size = LZ4_compressBound(src_size);

	char *compressed_data = malloc((size_t)max_dst_size);

	if (compressed_data == NULL) {
		printk("Failed to allocate memory for compressed data\n");
		return;
	}

	const int compressed_data_size = LZ4_compress_default(src,
					compressed_data, src_size,
					max_dst_size);
	if (compressed_data_size <= 0) {
		printk("Failed to compress the data\n");
		return;
	}

	printk("Original Data size: %d\n", src_size);
	printk("Compressed Data size : %d\n", compressed_data_size);

	compressed_data = (char *)realloc(compressed_data,
					  (size_t)compressed_data_size);
	if (compressed_data == NULL) {
		printk("Failed to re-alloc memory for compressed data\n");
		return;
	}

	char * const decompressed_data = malloc(src_size);

	if (decompressed_data == NULL) {
		printk("Failed to allocate memory to decompress data\n");
		return;
	}

	const int decompressed_size = LZ4_decompress_safe(compressed_data,
				      decompressed_data, compressed_data_size,
				      src_size);
	if (decompressed_size < 0) {
		printk("Failed to decompress the data\n");
		return;
	}

	free(compressed_data);

	if (decompressed_size >= 0) {
		printk("Successfully decompressed some data\n");
	}

	if (decompressed_size != src_size) {
		printk("Decompressed data is different from original\n");
		return;
	}

	if (memcmp(src, decompressed_data, src_size) != 0) {
		printk("Validation failed.\n");
		printk("*src and *new_src are not identical\n");
		return;
	}

	printk("Validation done. The string we ended up with is:\n%s\n",
			decompressed_data);
}