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diff --git a/intl/icu/source/i18n/collationdatawriter.h b/intl/icu/source/i18n/collationdatawriter.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2013-2014, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* collationdatawriter.h
+*
+* created on: 2013aug06
+* created by: Markus W. Scherer
+*/
+
+#ifndef __COLLATIONDATAWRITER_H__
+#define __COLLATIONDATAWRITER_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+U_NAMESPACE_BEGIN
+
+struct CollationData;
+struct CollationSettings;
+struct CollationTailoring;
+
+/**
+ * Collation-related code for tools & demos.
+ */
+class U_I18N_API CollationDataWriter /* all static */ {
+public:
+    static int32_t writeBase(const CollationData &data, const CollationSettings &settings,
+                             const void *rootElements, int32_t rootElementsLength,
+                             int32_t indexes[], uint8_t *dest, int32_t capacity,
+                             UErrorCode &errorCode);
+
+    static int32_t writeTailoring(const CollationTailoring &t, const CollationSettings &settings,
+                                  int32_t indexes[], uint8_t *dest, int32_t capacity,
+                                  UErrorCode &errorCode);
+
+private:
+    CollationDataWriter() = delete;  // no constructor
+
+    static int32_t write(UBool isBase, const UVersionInfo dataVersion,
+                         const CollationData &data, const CollationSettings &settings,
+                         const void *rootElements, int32_t rootElementsLength,
+                         int32_t indexes[], uint8_t *dest, int32_t capacity,
+                         UErrorCode &errorCode);
+
+    static void copyData(const int32_t indexes[], int32_t startIndex,
+                         const void *src, uint8_t *dest);
+};
+
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_COLLATION
+#endif  // __COLLATIONDATAWRITER_H__