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diff --git a/intl/icu/source/tools/toolutil/swapimpl.h b/intl/icu/source/tools/toolutil/swapimpl.h
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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+*   Copyright (C) 2005, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  swapimpl.h
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2005jul29
+*   created by: Markus W. Scherer
+*
+*   Declarations for data file swapping functions not declared in internal
+*   library headers.
+*/
+
+#ifndef __SWAPIMPL_H__
+#define __SWAPIMPL_H__
+
+#include "unicode/utypes.h"
+#include "udataswp.h"
+
+/**
+ * Identifies and then transforms the ICU data piece in-place, or determines
+ * its length. See UDataSwapFn.
+ * This function handles single data pieces (but not .dat data packages)
+ * and internally dispatches to per-type swap functions.
+ * Sets a U_UNSUPPORTED_ERROR if the data format is not recognized.
+ *
+ * @see UDataSwapFn
+ * @see udata_openSwapper
+ * @see udata_openSwapperForInputData
+ * @internal ICU 2.8
+ */
+U_CAPI int32_t U_EXPORT2
+udata_swap(const UDataSwapper *ds,
+           const void *inData, int32_t length, void *outData,
+           UErrorCode *pErrorCode);
+
+#endif