Fuzzers: Add a fuzzer for roundtrip LZMA compression/decompression

Meta/Lagom/Fuzzers/CMakeLists.txt

@@ -36,6 +36,7 @@ add_simple_fuzzer(FuzzICCProfile LibGfx)
 add_simple_fuzzer(FuzzICOLoader LibGfx)
 add_simple_fuzzer(FuzzJPEGLoader LibGfx)
 add_simple_fuzzer(FuzzLzmaDecompression LibArchive LibCompress)
+add_simple_fuzzer(FuzzLzmaRoundtrip LibCompress)
 add_simple_fuzzer(FuzzMatroskaReader LibVideo)
 add_simple_fuzzer(FuzzMD5 LibCrypto)
 add_simple_fuzzer(FuzzMP3Loader LibAudio)

Meta/Lagom/Fuzzers/FuzzLzmaRoundtrip.cpp

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2023, Tim Schumacher <timschumi@gmx.de>.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/MemoryStream.h>
+#include <LibCompress/Lzma.h>
+
+extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)
+{
+    AllocatingMemoryStream stream {};
+
+    auto compressor = MUST(Compress::LzmaCompressor::create_container(MaybeOwned<Stream> { stream }, {}));
+    MUST(compressor->write_until_depleted({ data, size }));
+    MUST(compressor->flush());
+
+    auto decompressor = MUST(Compress::LzmaDecompressor::create_from_container(MaybeOwned<Stream> { stream }));
+    auto result = MUST(decompressor->read_until_eof());
+
+    VERIFY((ReadonlyBytes { data, size }) == result.span());
+
+    return 0;
+}