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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/regression/data.h b/deps/libchdr/deps/zstd-1.5.5/tests/regression/data.h
new file mode 100644
index 00000000..a4ee9207
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+++ b/deps/libchdr/deps/zstd-1.5.5/tests/regression/data.h
@@ -0,0 +1,121 @@
+/*
+ * 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 DATA_H
+#define DATA_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+typedef enum {
+    data_type_file = 1,  /**< This data is a file. *.zst */
+    data_type_dir = 2,   /**< This data is a directory. *.tar.zst */
+} data_type_t;
+
+typedef struct {
+    char const* url;   /**< Where to get this resource. */
+    uint64_t xxhash64; /**< Hash of the url contents. */
+    char const* path;  /**< The path of the unpacked resource (derived). */
+} data_resource_t;
+
+typedef struct {
+    data_resource_t data;
+    data_resource_t dict;
+    data_type_t type;  /**< The type of the data. */
+    char const* name;  /**< The logical name of the data (no extension). */
+} data_t;
+
+/**
+ * The NULL-terminated list of data objects.
+ */
+extern data_t const* const* data;
+
+
+int data_has_dict(data_t const* data);
+
+/**
+ * Initializes the data module and downloads the data necessary.
+ * Caches the downloads in dir. We add a stamp file in the directory after
+ * a successful download. If a stamp file already exists, and matches our
+ * current data stamp, we will use the cached data without downloading.
+ *
+ * @param dir The directory to cache the downloaded data into.
+ *
+ * @returns 0 on success.
+ */
+int data_init(char const* dir);
+
+/**
+ * Must be called at exit to free resources allocated by data_init().
+ */
+void data_finish(void);
+
+typedef struct {
+    uint8_t* data;
+    size_t size;
+    size_t capacity;
+} data_buffer_t;
+
+/**
+ * Read the file that data points to into a buffer.
+ * NOTE: data must be a file, not a directory.
+ *
+ * @returns The buffer, which is NULL on failure.
+ */
+data_buffer_t data_buffer_get_data(data_t const* data);
+
+/**
+ * Read the dictionary that the data points to into a buffer.
+ *
+ * @returns The buffer, which is NULL on failure.
+ */
+data_buffer_t data_buffer_get_dict(data_t const* data);
+
+/**
+ * Read the contents of filename into a buffer.
+ *
+ * @returns The buffer, which is NULL on failure.
+ */
+data_buffer_t data_buffer_read(char const* filename);
+
+/**
+ * Create a buffer with the specified capacity.
+ *
+ * @returns The buffer, which is NULL on failure.
+ */
+data_buffer_t data_buffer_create(size_t capacity);
+
+/**
+ * Calls memcmp() on the contents [0, size) of both buffers.
+ */
+int data_buffer_compare(data_buffer_t buffer1, data_buffer_t buffer2);
+
+/**
+ * Frees an allocated buffer.
+ */
+void data_buffer_free(data_buffer_t buffer);
+
+
+typedef struct {
+    data_buffer_t const* buffers;
+    size_t size;
+} data_buffers_t;
+
+/**
+ * @returns a list of buffers for every file in data. It is zero sized on error.
+ */
+data_buffers_t data_buffers_get(data_t const* data);
+
+/**
+ * Frees the data buffers.
+ */
+void data_buffers_free(data_buffers_t buffers);
+
+#endif