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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/invalidDictionaries.c b/deps/libchdr/deps/zstd-1.5.5/tests/invalidDictionaries.c
new file mode 100644
index 00000000..66caa9e9
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/invalidDictionaries.c
@@ -0,0 +1,61 @@
+/*
+ * 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.
+ */
+
+#include <stddef.h>
+#include "zstd.h"
+
+static const char invalidRepCode[] = {
+  0x37, 0xa4, 0x30, 0xec, 0x2a, 0x00, 0x00, 0x00, 0x39, 0x10, 0xc0, 0xc2,
+  0xa6, 0x00, 0x0c, 0x30, 0xc0, 0x00, 0x03, 0x0c, 0x30, 0x20, 0x72, 0xf8,
+  0xb4, 0x6d, 0x4b, 0x9f, 0xfc, 0x97, 0x29, 0x49, 0xb2, 0xdf, 0x4b, 0x29,
+  0x7d, 0x4a, 0xfc, 0x83, 0x18, 0x22, 0x75, 0x23, 0x24, 0x44, 0x4d, 0x02,
+  0xb7, 0x97, 0x96, 0xf6, 0xcb, 0xd1, 0xcf, 0xe8, 0x22, 0xea, 0x27, 0x36,
+  0xb7, 0x2c, 0x40, 0x46, 0x01, 0x08, 0x23, 0x01, 0x00, 0x00, 0x06, 0x1e,
+  0x3c, 0x83, 0x81, 0xd6, 0x18, 0xd4, 0x12, 0x3a, 0x04, 0x00, 0x80, 0x03,
+  0x08, 0x0e, 0x12, 0x1c, 0x12, 0x11, 0x0d, 0x0e, 0x0a, 0x0b, 0x0a, 0x09,
+  0x10, 0x0c, 0x09, 0x05, 0x04, 0x03, 0x06, 0x06, 0x06, 0x02, 0x00, 0x03,
+  0x00, 0x00, 0x02, 0x02, 0x00, 0x04, 0x06, 0x03, 0x06, 0x08, 0x24, 0x6b,
+  0x0d, 0x01, 0x10, 0x04, 0x81, 0x07, 0x00, 0x00, 0x04, 0xb9, 0x58, 0x18,
+  0x06, 0x59, 0x92, 0x43, 0xce, 0x28, 0xa5, 0x08, 0x88, 0xc0, 0x80, 0x88,
+  0x8c, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
+  0x08, 0x00, 0x00, 0x00
+};
+
+typedef struct dictionary_s {
+  const char *data;
+  size_t size;
+} dictionary;
+
+static const dictionary dictionaries[] = {
+  {invalidRepCode, sizeof(invalidRepCode)},
+  {NULL, 0},
+};
+
+int main(int argc, const char** argv) {
+  const dictionary *dict;
+  for (dict = dictionaries; dict->data != NULL; ++dict) {
+    ZSTD_CDict *cdict;
+    ZSTD_DDict *ddict;
+    cdict = ZSTD_createCDict(dict->data, dict->size, 1);
+    if (cdict) {
+      ZSTD_freeCDict(cdict);
+      return 1;
+    }
+    ddict = ZSTD_createDDict(dict->data, dict->size);
+    if (ddict) {
+      ZSTD_freeDDict(ddict);
+      return 2;
+    }
+  }
+
+  (void)argc;
+  (void)argv;
+  return 0;
+}