1 files changed, 36 insertions, 0 deletions
diff --git a/src/jmh/java/com/code_intelligence/jazzer/instrumentor/DirectByteBufferCoverageMap.java b/src/jmh/java/com/code_intelligence/jazzer/instrumentor/DirectByteBufferCoverageMap.java
new file mode 100644
index 00000000..e5e66abb
--- /dev/null
+++ b/src/jmh/java/com/code_intelligence/jazzer/instrumentor/DirectByteBufferCoverageMap.java
@@ -0,0 +1,36 @@
+// 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.instrumentor;
+
+import java.nio.ByteBuffer;
+
+public final class DirectByteBufferCoverageMap {
+  // The current target, JsonSanitizer, uses less than 2048 coverage counters.
+  private static final int NUM_COUNTERS = 4096;
+  public static final ByteBuffer counters = ByteBuffer.allocateDirect(NUM_COUNTERS);
+
+  public static void enlargeIfNeeded(int nextId) {
+    // Statically sized counters buffer.
+  }
+
+  public static void recordCoverage(final int id) {
+    final byte counter = counters.get(id);
+    if (counter == -1) {
+      counters.put(id, (byte) 1);
+    } else {
+      counters.put(id, (byte) (counter + 1));
+    }
+  }
+}