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diff --git a/intl/icu/source/tools/gennorm2/extradata.h b/intl/icu/source/tools/gennorm2/extradata.h
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+// © 2017 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+// extradata.h
+// created: 2017jun04 Markus W. Scherer
+// (pulled out of n2builder.cpp)
+
+// Write mappings and compositions in compact form for Normalizer2 "extra data",
+// the data that does not fit into the trie itself.
+
+#ifndef __EXTRADATA_H__
+#define __EXTRADATA_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_NORMALIZATION
+
+#include "unicode/errorcode.h"
+#include "unicode/unistr.h"
+#include "unicode/utf16.h"
+#include "hash.h"
+#include "norms.h"
+#include "toolutil.h"
+#include "utrie2.h"
+#include "uvectr32.h"
+
+U_NAMESPACE_BEGIN
+
+class ExtraData : public Norms::Enumerator {
+public:
+    ExtraData(Norms &n, UBool fast);
+
+    void rangeHandler(UChar32 start, UChar32 end, Norm &norm) override;
+
+    UnicodeString maybeYesCompositions;
+    UnicodeString yesYesCompositions;
+    UnicodeString yesNoMappingsAndCompositions;
+    UnicodeString yesNoMappingsOnly;
+    UnicodeString noNoMappingsCompYes;
+    UnicodeString noNoMappingsCompBoundaryBefore;
+    UnicodeString noNoMappingsCompNoMaybeCC;
+    UnicodeString noNoMappingsEmpty;
+
+private:
+    /**
+     * Requires norm.hasMapping().
+     * Returns the offset of the "first unit" from the beginning of the extraData for c.
+     * That is the same as the length of the optional data
+     * for the raw mapping and the ccc/lccc word.
+     */
+    int32_t writeMapping(UChar32 c, const Norm &norm, UnicodeString &dataString);
+    int32_t writeNoNoMapping(UChar32 c, const Norm &norm,
+                             UnicodeString &dataString, Hashtable &previousMappings);
+    UBool setNoNoDelta(UChar32 c, Norm &norm) const;
+    /** Requires norm.compositions!=nullptr. */
+    void writeCompositions(UChar32 c, const Norm &norm, UnicodeString &dataString);
+    void writeExtraData(UChar32 c, Norm &norm);
+
+    UBool optimizeFast;
+    Hashtable previousNoNoMappingsCompYes;  // If constructed in runtime code, pass in UErrorCode.
+    Hashtable previousNoNoMappingsCompBoundaryBefore;
+    Hashtable previousNoNoMappingsCompNoMaybeCC;
+    Hashtable previousNoNoMappingsEmpty;
+};
+
+U_NAMESPACE_END
+
+#endif // #if !UCONFIG_NO_NORMALIZATION
+
+#endif  // __EXTRADATA_H__