1 files changed, 46 insertions, 0 deletions
diff --git a/src/jmh/java/com/code_intelligence/jazzer/runtime/FuzzerCallbacksOptimizedCritical.java b/src/jmh/java/com/code_intelligence/jazzer/runtime/FuzzerCallbacksOptimizedCritical.java
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+++ b/src/jmh/java/com/code_intelligence/jazzer/runtime/FuzzerCallbacksOptimizedCritical.java
@@ -0,0 +1,46 @@
+// Copyright 2022 Code Intelligence GmbH
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.code_intelligence.jazzer.runtime;
+
+import com.github.fmeum.rules_jni.RulesJni;
+import java.io.UnsupportedEncodingException;
+
+/**
+ * Optimized implementations of the libFuzzer callbacks that do rely on the deprecated
+ * CriticalJNINatives feature. Methods with `Java` in their name implement some parts in Java.
+ */
+public final class FuzzerCallbacksOptimizedCritical {
+  static {
+    RulesJni.loadLibrary("fuzzer_callbacks", FuzzerCallbacksOptimizedCritical.class);
+  }
+
+  static native void traceCmpInt(int arg1, int arg2, int pc);
+
+  static native void traceSwitch(long val, long[] cases, int pc);
+
+  static native void traceMemcmp(byte[] b1, byte[] b2, int result, int pc);
+
+  static void traceStrstrJava(String haystack, String needle, int pc)
+      throws UnsupportedEncodingException {
+    // Note that we are not encoding as modified UTF-8 here: The FuzzedDataProvider transparently
+    // converts CESU8 into modified UTF-8 by coding null bytes on two bytes. Since the fuzzer is
+    // more likely to insert literal null bytes, having both the fuzzer input and the reported
+    // string comparisons be CESU8 should perform even better than the current implementation using
+    // modified UTF-8.
+    traceStrstrInternal(needle.substring(0, Math.min(needle.length(), 64)).getBytes("CESU8"), pc);
+  }
+
+  private static native void traceStrstrInternal(byte[] needle, int pc);
+}