Add zstd.

3rdparty/zstd-1.5.0/tests/fuzz/fuzz_helpers.c

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#include "fuzz_helpers.h"
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+void* FUZZ_malloc(size_t size)
+{
+    if (size > 0) {
+        void* const mem = malloc(size);
+        FUZZ_ASSERT(mem);
+        return mem;
+    }
+    return NULL;
+}
+
+int FUZZ_memcmp(void const* lhs, void const* rhs, size_t size)
+{
+    if (size == 0) {
+        return 0;
+    }
+    return memcmp(lhs, rhs, size);
+}