/*
   Fuzzing for lzxpress_huffman{_decompress,_compress} round trip
   Copyright (C) Michael Hanselmann 2019
   Copyright (C) Douglas Bagnall 2022 <dbagnall@samba.org>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that 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.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "fuzzing/fuzzing.h"
#include "compression/lzxpress_huffman.h"


int LLVMFuzzerInitialize(int *argc, char ***argv)
{
	return 0;
}


int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len)
{
        /*
	 * we allow compressed to be 25% bigger than decompressed.
	 */
	static uint8_t compressed[1024 * (1024 + 256)];
	static uint8_t decompressed[1024 * 1024];
	ssize_t compressed_size;
	ssize_t decompressed_size;
	struct lzxhuff_compressor_mem cmp;

	if (len > sizeof(decompressed) || len == 0) {
		return 0;
	}

	compressed_size = lzxpress_huffman_compress(&cmp,
						    buf,
						    len,
						    compressed,
						    sizeof(compressed));
	if (compressed_size < 0) {
		abort();
	}

	decompressed_size = lzxpress_huffman_decompress(compressed,
							compressed_size,
							decompressed,
							len);

	if (decompressed_size != len) {
		abort();
	}
	if (memcmp(buf, decompressed, len) != 0) {
		abort();
	}

	return 0;
}