LibCompress: Upgrade compression fuzzer into a roundtrip fuzzer

Author: https://github.com/Janiczek
Commit: https://github.com/SerenityOS/serenity/commit/0465ba242b
Pull-request: https://github.com/SerenityOS/serenity/pull/21618
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/timschumi ✅

Meta/Lagom/Fuzzers/FuzzGzipRoundtrip.cpp

@@ -10,6 +10,12 @@
 extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)
 {
     AK::set_debug_enabled(false);
-    (void)Compress::GzipCompressor::compress_all(ReadonlyBytes { data, size });
+    auto input = ReadonlyBytes { data, size };
+
+    auto compressed = MUST(Compress::GzipCompressor::compress_all(input));
+    auto decompressed = MUST(Compress::GzipDecompressor::decompress_all(compressed));
+
+    VERIFY(decompressed == input);
+
     return 0;
 }

Meta/Lagom/Fuzzers/fuzzers.cmake

@@ -11,8 +11,8 @@ set(FUZZER_TARGETS
     FlacLoader
     Gemini
     GIFLoader
-    GzipCompression
     GzipDecompression
+    GzipRoundtrip
     HttpRequest
     ICCProfile
     ICOLoader
@@ -83,8 +83,8 @@ set(FUZZER_DEPENDENCIES_ELF LibELF)
 set(FUZZER_DEPENDENCIES_FlacLoader LibAudio)
 set(FUZZER_DEPENDENCIES_Gemini LibGemini)
 set(FUZZER_DEPENDENCIES_GIFLoader LibGfx)
-set(FUZZER_DEPENDENCIES_GzipCompression LibCompress)
 set(FUZZER_DEPENDENCIES_GzipDecompression LibCompress)
+set(FUZZER_DEPENDENCIES_GzipRoundtrip LibCompress)
 set(FUZZER_DEPENDENCIES_HttpRequest LibHTTP)
 set(FUZZER_DEPENDENCIES_ICCProfile LibGfx)
 set(FUZZER_DEPENDENCIES_ICOLoader LibGfx)

Userland/Utilities/test-fuzz.cpp

@@ -25,8 +25,8 @@
     T(FlacLoader)            \
     T(Gemini)                \
     T(GIFLoader)             \
-    T(GzipCompression)       \
     T(GzipDecompression)     \
+    T(GzipRoundtrip)         \
     T(HttpRequest)           \
     T(ICCProfile)            \
     T(ICOLoader)             \