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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/fuzz/zstd_helpers.h b/deps/libchdr/deps/zstd-1.5.5/tests/fuzz/zstd_helpers.h
new file mode 100644
index 00000000..be3071d2
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/fuzz/zstd_helpers.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * 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.
+ */
+/**
+ * Helper functions for fuzzing.
+ */
+
+#ifndef ZSTD_HELPERS_H
+#define ZSTD_HELPERS_H
+
+#define ZSTD_STATIC_LINKING_ONLY
+
+#include "zstd.h"
+#include "zstd_errors.h"
+#include "fuzz_data_producer.h"
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const int kMinClevel;
+extern const int kMaxClevel;
+
+void FUZZ_setRandomParameters(ZSTD_CCtx *cctx, size_t srcSize, FUZZ_dataProducer_t *producer);
+
+ZSTD_compressionParameters FUZZ_randomCParams(size_t srcSize, FUZZ_dataProducer_t *producer);
+ZSTD_frameParameters FUZZ_randomFParams(FUZZ_dataProducer_t *producer);
+ZSTD_parameters FUZZ_randomParams(size_t srcSize, FUZZ_dataProducer_t *producer);
+
+typedef struct {
+  void* buff;
+  size_t size;
+} FUZZ_dict_t;
+
+/* Quickly train a dictionary from a source for fuzzing.
+ * NOTE: Don't use this to train production dictionaries, it is only optimized
+ * for speed, and doesn't care about dictionary quality.
+ */
+FUZZ_dict_t FUZZ_train(void const* src, size_t srcSize, FUZZ_dataProducer_t *producer);
+
+#ifdef FUZZ_THIRD_PARTY_SEQ_PROD
+extern void* FUZZ_seqProdState;
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZSTD_HELPERS_H */