tests/fuzzing/fuzz_translate.c

//
// liblouis Braille Translation and Back-Translation Library
//
// Copyright (C) 2022 Anna Stan, Nicolas Morel, Kalilou Mamadou Dramé
//
// This file is part of liblouis.
//
// liblouis is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 2.1 of the License, or
// (at your option) any later version.
//
// liblouis 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with liblouis. If not, see <http://www.gnu.org/licenses/>.
//

#include <config.h>

#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

#include <internal.h>
#include <liblouis.h>
#include <assert.h>

#define LANGUAGE	"en"

static int initialized = 0;

#define BOLDRED(x)	"\x1b[31m\x1b[1m" x "\x1b[0m"

static const char *table_default;

static void __attribute__((destructor))
free_ressources(void) {
	lou_free();
}

void
avoid_log(logLevels level, const char *msg) {
	(void) level;
	(void) msg;
}

extern int LLVMFuzzerRunDriver(int *argc, char ***argv,
			       int (*UserCb)(const uint8_t *Data, size_t Size));


int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
	int inputLen = 0;
	int outputLen = 0;
	char *mutable_data = NULL;
	
	if (!initialized)
	{
		lou_registerLogCallback(avoid_log);
		table_default = getenv("FUZZ_TABLE");
		initialized = 1;
	}

	mutable_data = strndup((char*)data, size);
	if (!mutable_data) 
	{
		perror("malloc");
		exit(1);
	}

	widechar *inputText = malloc((size*16+1)*sizeof(widechar));
	int len = (int)_lou_extParseChars(mutable_data, inputText);
	free(mutable_data);
	if (len <= 0) {
		free(inputText);
		return -1;
	}

	assert(len <= (size*16));
	inputLen = len;
	outputLen = len*16;
	widechar *outputText = malloc((outputLen+1)*sizeof(widechar));
	if (table_default == NULL)
	{
		fprintf(stderr, "\n" BOLDRED("[Please set up FUZZ_TABLE env var before starting fuzzer]")"\nThis environment variable is supposed to contain the table you want to test with lou_translateString()\n\n");
		exit(0);
	}
	lou_translateString(table_default, inputText, &inputLen, outputText, &outputLen, NULL, NULL, ucBrl);
	free(inputText);
	free(outputText);

	return 0;
}

int main(int argc, char *argv[]) {
	LLVMFuzzerRunDriver(&argc, &argv, LLVMFuzzerTestOneInput);
}