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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/regression/config.h b/deps/libchdr/deps/zstd-1.5.5/tests/regression/config.h
new file mode 100644
index 00000000..a4b542a9
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/regression/config.h
@@ -0,0 +1,91 @@
+/*
+ * 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 CONFIG_H
+#define CONFIG_H
+
+#include <stddef.h>
+
+#define ZSTD_STATIC_LINKING_ONLY
+#include <zstd.h>
+
+#include "data.h"
+
+typedef struct {
+    ZSTD_cParameter param;
+    int value;
+} param_value_t;
+
+typedef struct {
+    size_t size;
+    param_value_t const* data;
+} param_values_t;
+
+/**
+ * The config tells the compression method what options to use.
+ */
+typedef struct {
+    const char* name;  /**< Identifies the config in the results table */
+    /**
+     * Optional arguments to pass to the CLI. If not set, CLI-based methods
+     * will skip this config.
+     */
+    char const* cli_args;
+    /**
+     * Parameters to pass to the advanced API. If the advanced API isn't used,
+     * the parameters will be derived from these.
+     */
+    param_values_t param_values;
+    /**
+     * Boolean parameter that says if we should use a dictionary. If the data
+     * doesn't have a dictionary, this config is skipped. Defaults to no.
+     */
+    int use_dictionary;
+    /**
+     * Boolean parameter that says if we should pass the pledged source size
+     * when the method allows it. Defaults to yes.
+     */
+    int no_pledged_src_size;
+    /**
+     * Boolean parameter that says that this config should only be used
+     * for methods that use the advanced compression API
+     */
+    int advanced_api_only;
+} config_t;
+
+/**
+ * Returns true if the config should skip this data.
+ * For instance, if the config requires a dictionary but the data doesn't have
+ * one.
+ */
+int config_skip_data(config_t const* config, data_t const* data);
+
+#define CONFIG_NO_LEVEL (-ZSTD_TARGETLENGTH_MAX - 1)
+/**
+ * Returns the compression level specified by the config, or CONFIG_NO_LEVEL if
+ * no level is specified. Note that 0 is a valid compression level, meaning
+ * default.
+ */
+int config_get_level(config_t const* config);
+
+/**
+ * Returns the compression parameters specified by the config.
+ */
+ZSTD_parameters config_get_zstd_params(
+    config_t const* config,
+    uint64_t srcSize,
+    size_t dictSize);
+
+/**
+ * The NULL-terminated list of configs.
+ */
+extern config_t const* const* configs;
+
+#endif