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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/regression/result.h b/deps/libchdr/deps/zstd-1.5.5/tests/regression/result.h
new file mode 100644
index 00000000..8a761ea4
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/regression/result.h
@@ -0,0 +1,103 @@
+/*
+ * 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.
+ */
+
+#ifndef RESULT_H
+#define RESULT_H
+
+#include <stddef.h>
+
+/**
+ * The error type enum.
+ */
+typedef enum {
+    result_error_ok,                   /**< No error. */
+    result_error_skip,                 /**< This method was skipped. */
+    result_error_system_error,         /**< Some internal error happened. */
+    result_error_compression_error,    /**< Compression failed. */
+    result_error_decompression_error,  /**< Decompression failed. */
+    result_error_round_trip_error,     /**< Data failed to round trip. */
+} result_error_t;
+
+/**
+ * The success type.
+ */
+typedef struct {
+    size_t total_size;  /**< The total compressed size. */
+} result_data_t;
+
+/**
+ * The result type.
+ * Do not access the member variables directory, use the helper functions.
+ */
+typedef struct {
+    result_error_t internal_error;
+    result_data_t internal_data;
+} result_t;
+
+/**
+ * Create a result of the error type.
+ */
+static result_t result_error(result_error_t error);
+/**
+ * Create a result of the success type.
+ */
+static result_t result_data(result_data_t data);
+
+/**
+ * Check if the result is an error or skip.
+ */
+static int result_is_error(result_t result);
+/**
+ * Check if the result error is skip.
+ */
+static int result_is_skip(result_t result);
+/**
+ * Get the result error or okay.
+ */
+static result_error_t result_get_error(result_t result);
+/**
+ * Get the result data. The result MUST be checked with result_is_error() first.
+ */
+static result_data_t result_get_data(result_t result);
+
+static result_t result_error(result_error_t error) {
+    result_t result = {
+        .internal_error = error,
+    };
+    return result;
+}
+
+static result_t result_data(result_data_t data) {
+    result_t result = {
+        .internal_error = result_error_ok,
+        .internal_data = data,
+    };
+    return result;
+}
+
+static int result_is_error(result_t result) {
+    return result_get_error(result) != result_error_ok;
+}
+
+static int result_is_skip(result_t result) {
+    return result_get_error(result) == result_error_skip;
+}
+
+static result_error_t result_get_error(result_t result) {
+    return result.internal_error;
+}
+
+char const* result_get_error_string(result_t result);
+
+static result_data_t result_get_data(result_t result) {
+    return result.internal_data;
+}
+
+#endif