Add minimal libFuzzer-compatible harness for FfsParser

fuzzing/ffsparser_fuzzer.cpp

@@ -0,0 +1,31 @@
+/* ffsparser_fuzzer.cpp
+ 
+ Copyright (c) 2023, Nikolaj Schlej. All rights reserved.
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution.  The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+ 
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+ 
+ */
+
+#include "../common/ffsparser.h"
+
+#define FUZZING_MIN_INPUT_SIZE 16
+#define FUZZING_MAX_INPUT_SIZE (128 * 1024 * 1024)
+
+extern "C" int LLVMFuzzerTestOneInput(const char *Data, long long Size) {
+    // Do not overblow the inout file size, won't change much in practical sense
+    if (Size > FUZZING_MAX_INPUT_SIZE || Size < FUZZING_MIN_INPUT_SIZE) return 0;
+
+    // Create the FFS parser
+    TreeModel* model = new TreeModel();
+    FfsParser* ffsParser = new FfsParser(model);
+
+    // Parse the image
+    (void)ffsParser->parse(UByteArray(Data, (uint32_t)Size));
+
+    return 0;
+}