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diff --git a/deps/libchdr/deps/zstd-1.5.5/programs/datagen.h b/deps/libchdr/deps/zstd-1.5.5/programs/datagen.h
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index 00000000..ca727000
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+/*
+ * 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 DATAGEN_H
+#define DATAGEN_H
+
+#include <stddef.h>   /* size_t */
+
+void RDG_genStdout(unsigned long long size, double matchProba, double litProba, unsigned seed);
+void RDG_genBuffer(void* buffer, size_t size, double matchProba, double litProba, unsigned seed);
+/*!RDG_genBuffer
+   Generate 'size' bytes of compressible data into 'buffer'.
+   Compressibility can be controlled using 'matchProba', which is floating point value between 0 and 1.
+   'LitProba' is optional, it affect variability of individual bytes. If litProba==0.0, default value will be used.
+   Generated data pattern can be modified using different 'seed'.
+   For a triplet (matchProba, litProba, seed), the function always generate the same content.
+
+   RDG_genStdout
+   Same as RDG_genBuffer, but generates data into stdout
+*/
+
+#endif