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diff --git a/intl/icu/source/i18n/collationdata.h b/intl/icu/source/i18n/collationdata.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2010-2015, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* collationdata.h
+*
+* created on: 2010oct27
+* created by: Markus W. Scherer
+*/
+
+#ifndef __COLLATIONDATA_H__
+#define __COLLATIONDATA_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+#include "unicode/ucol.h"
+#include "unicode/uniset.h"
+#include "collation.h"
+#include "normalizer2impl.h"
+#include "utrie2.h"
+
+struct UDataMemory;
+
+U_NAMESPACE_BEGIN
+
+class UVector32;
+
+/**
+ * Collation data container.
+ * Immutable data created by a CollationDataBuilder, or loaded from a file,
+ * or deserialized from API-provided binary data.
+ *
+ * Includes data for the collation base (root/default), aliased if this is not the base.
+ */
+struct U_I18N_API CollationData : public UMemory {
+    // Note: The ucadata.icu loader could discover the reserved ranges by setting an array
+    // parallel with the ranges, and resetting ranges that are indexed.
+    // The reordering builder code could clone the resulting template array.
+    static constexpr int32_t REORDER_RESERVED_BEFORE_LATIN = UCOL_REORDER_CODE_FIRST + 14;
+    static constexpr int32_t REORDER_RESERVED_AFTER_LATIN = REORDER_RESERVED_BEFORE_LATIN + 1;
+
+    static constexpr int32_t MAX_NUM_SPECIAL_REORDER_CODES = 8;
+    /** C++ only, data reader check scriptStartsLength. */
+    static constexpr int32_t MAX_NUM_SCRIPT_RANGES = 256;
+
+    CollationData(const Normalizer2Impl &nfc)
+            : trie(nullptr),
+              ce32s(nullptr), ces(nullptr), contexts(nullptr), base(nullptr),
+              jamoCE32s(nullptr),
+              nfcImpl(nfc),
+              numericPrimary(0x12000000),
+              ce32sLength(0), cesLength(0), contextsLength(0),
+              compressibleBytes(nullptr),
+              unsafeBackwardSet(nullptr),
+              fastLatinTable(nullptr), fastLatinTableLength(0),
+              numScripts(0), scriptsIndex(nullptr), scriptStarts(nullptr), scriptStartsLength(0),
+              rootElements(nullptr), rootElementsLength(0) {}
+
+    uint32_t getCE32(UChar32 c) const {
+        return UTRIE2_GET32(trie, c);
+    }
+
+    uint32_t getCE32FromSupplementary(UChar32 c) const {
+        return UTRIE2_GET32_FROM_SUPP(trie, c);
+    }
+
+    UBool isDigit(UChar32 c) const {
+        return c < 0x660 ? c <= 0x39 && 0x30 <= c :
+                Collation::hasCE32Tag(getCE32(c), Collation::DIGIT_TAG);
+    }
+
+    UBool isUnsafeBackward(UChar32 c, UBool numeric) const {
+        return unsafeBackwardSet->contains(c) || (numeric && isDigit(c));
+    }
+
+    UBool isCompressibleLeadByte(uint32_t b) const {
+        return compressibleBytes[b];
+    }
+
+    inline UBool isCompressiblePrimary(uint32_t p) const {
+        return isCompressibleLeadByte(p >> 24);
+    }
+
+    /**
+     * Returns the CE32 from two contexts words.
+     * Access to the defaultCE32 for contraction and prefix matching.
+     */
+    static uint32_t readCE32(const char16_t *p) {
+        return ((uint32_t)p[0] << 16) | p[1];
+    }
+
+    /**
+     * Returns the CE32 for an indirect special CE32 (e.g., with DIGIT_TAG).
+     * Requires that ce32 is special.
+     */
+    uint32_t getIndirectCE32(uint32_t ce32) const;
+    /**
+     * Returns the CE32 for an indirect special CE32 (e.g., with DIGIT_TAG),
+     * if ce32 is special.
+     */
+    uint32_t getFinalCE32(uint32_t ce32) const;
+
+    /**
+     * Computes a CE from c's ce32 which has the OFFSET_TAG.
+     */
+    int64_t getCEFromOffsetCE32(UChar32 c, uint32_t ce32) const {
+        int64_t dataCE = ces[Collation::indexFromCE32(ce32)];
+        return Collation::makeCE(Collation::getThreeBytePrimaryForOffsetData(c, dataCE));
+    }
+
+    /**
+     * Returns the single CE that c maps to.
+     * Sets U_UNSUPPORTED_ERROR if c does not map to a single CE.
+     */
+    int64_t getSingleCE(UChar32 c, UErrorCode &errorCode) const;
+
+    /**
+     * Returns the FCD16 value for code point c. c must be >= 0.
+     */
+    uint16_t getFCD16(UChar32 c) const {
+        return nfcImpl.getFCD16(c);
+    }
+
+    /**
+     * Returns the first primary for the script's reordering group.
+     * @return the primary with only the first primary lead byte of the group
+     *         (not necessarily an actual root collator primary weight),
+     *         or 0 if the script is unknown
+     */
+    uint32_t getFirstPrimaryForGroup(int32_t script) const;
+
+    /**
+     * Returns the last primary for the script's reordering group.
+     * @return the last primary of the group
+     *         (not an actual root collator primary weight),
+     *         or 0 if the script is unknown
+     */
+    uint32_t getLastPrimaryForGroup(int32_t script) const;
+
+    /**
+     * Finds the reordering group which contains the primary weight.
+     * @return the first script of the group, or -1 if the weight is beyond the last group
+     */
+    int32_t getGroupForPrimary(uint32_t p) const;
+
+    int32_t getEquivalentScripts(int32_t script,
+                                 int32_t dest[], int32_t capacity, UErrorCode &errorCode) const;
+
+    /**
+     * Writes the permutation of primary-weight ranges
+     * for the given reordering of scripts and groups.
+     * The caller checks for illegal arguments and
+     * takes care of [DEFAULT] and memory allocation.
+     *
+     * Each list element will be a (limit, offset) pair as described
+     * for the CollationSettings::reorderRanges.
+     * The list will be empty if no ranges are reordered.
+     */
+    void makeReorderRanges(const int32_t *reorder, int32_t length,
+                           UVector32 &ranges, UErrorCode &errorCode) const;
+
+    /** @see jamoCE32s */
+    static const int32_t JAMO_CE32S_LENGTH = 19 + 21 + 27;
+
+    /** Main lookup trie. */
+    const UTrie2 *trie;
+    /**
+     * Array of CE32 values.
+     * At index 0 there must be CE32(U+0000)
+     * to support U+0000's special-tag for NUL-termination handling.
+     */
+    const uint32_t *ce32s;
+    /** Array of CE values for expansions and OFFSET_TAG. */
+    const int64_t *ces;
+    /** Array of prefix and contraction-suffix matching data. */
+    const char16_t *contexts;
+    /** Base collation data, or nullptr if this data itself is a base. */
+    const CollationData *base;
+    /**
+     * Simple array of JAMO_CE32S_LENGTH=19+21+27 CE32s, one per canonical Jamo L/V/T.
+     * They are normally simple CE32s, rarely expansions.
+     * For fast handling of HANGUL_TAG.
+     */
+    const uint32_t *jamoCE32s;
+    const Normalizer2Impl &nfcImpl;
+    /** The single-byte primary weight (xx000000) for numeric collation. */
+    uint32_t numericPrimary;
+
+    int32_t ce32sLength;
+    int32_t cesLength;
+    int32_t contextsLength;
+
+    /** 256 flags for which primary-weight lead bytes are compressible. */
+    const UBool *compressibleBytes;
+    /**
+     * Set of code points that are unsafe for starting string comparison after an identical prefix,
+     * or in backwards CE iteration.
+     */
+    const UnicodeSet *unsafeBackwardSet;
+
+    /**
+     * Fast Latin table for common-Latin-text string comparisons.
+     * Data structure see class CollationFastLatin.
+     */
+    const uint16_t *fastLatinTable;
+    int32_t fastLatinTableLength;
+
+    /**
+     * Data for scripts and reordering groups.
+     * Uses include building a reordering permutation table and
+     * providing script boundaries to AlphabeticIndex.
+     */
+    int32_t numScripts;
+    /**
+     * The length of scriptsIndex is numScripts+16.
+     * It maps from a UScriptCode or a special reorder code to an entry in scriptStarts.
+     * 16 special reorder codes (not all used) are mapped starting at numScripts.
+     * Up to MAX_NUM_SPECIAL_REORDER_CODES are codes for special groups like space/punct/digit.
+     * There are special codes at the end for reorder-reserved primary ranges.
+     *
+     * Multiple scripts may share a range and index, for example Hira & Kana.
+     */
+    const uint16_t *scriptsIndex;
+    /**
+     * Start primary weight (top 16 bits only) for a group/script/reserved range
+     * indexed by scriptsIndex.
+     * The first range (separators & terminators) and the last range (trailing weights)
+     * are not reorderable, and no scriptsIndex entry points to them.
+     */
+    const uint16_t *scriptStarts;
+    int32_t scriptStartsLength;
+
+    /**
+     * Collation elements in the root collator.
+     * Used by the CollationRootElements class. The data structure is described there.
+     * nullptr in a tailoring.
+     */
+    const uint32_t *rootElements;
+    int32_t rootElementsLength;
+
+private:
+    int32_t getScriptIndex(int32_t script) const;
+    void makeReorderRanges(const int32_t *reorder, int32_t length,
+                           UBool latinMustMove,
+                           UVector32 &ranges, UErrorCode &errorCode) const;
+    int32_t addLowScriptRange(uint8_t table[], int32_t index, int32_t lowStart) const;
+    int32_t addHighScriptRange(uint8_t table[], int32_t index, int32_t highLimit) const;
+};
+
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_COLLATION
+#endif  // __COLLATIONDATA_H__