[TextServer] Add ICU Unicode security and spoofing detection.

11 files changed, 4260 insertions, 1 deletions

diff --git a/thirdparty/README.md b/thirdparty/README.md
index b06d9cec81..6db011d3c6 100644
--- a/thirdparty/README.md
+++ b/thirdparty/README.md
@@ -231,6 +231,8 @@ Files extracted from upstream source:
 Files extracted from upstream source:
 
 - the `common` folder
+- `scriptset.*`, `ucln_in.*`, `uspoof.cpp"` and `uspoof_impl.cpp` from the `i18n` folder
+- `uspoof.h` from the `i18n/unicode` folder
 - `LICENSE`
 
 Files generated from upstream source:
diff --git a/thirdparty/icu4c/godot_data.json b/thirdparty/icu4c/godot_data.json
index 3a9c28af4c..e36e2b078b 100644
--- a/thirdparty/icu4c/godot_data.json
+++ b/thirdparty/icu4c/godot_data.json
@@ -6,5 +6,6 @@
         brkitr_tree: include
         misc: include
         normalization: include
+        confusables: include
     }
-}
\ No newline at end of file
+}
diff --git a/thirdparty/icu4c/i18n/scriptset.cpp b/thirdparty/icu4c/i18n/scriptset.cpp
new file mode 100644
index 0000000000..6a1db8c01c
--- /dev/null
+++ b/thirdparty/icu4c/i18n/scriptset.cpp
@@ -0,0 +1,313 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+*   Copyright (C) 2014, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*
+* scriptset.cpp
+*
+* created on: 2013 Jan 7
+* created by: Andy Heninger
+*/
+
+#include "unicode/utypes.h"
+
+#include "unicode/uchar.h"
+#include "unicode/unistr.h"
+
+#include "scriptset.h"
+#include "uassert.h"
+#include "cmemory.h"
+
+U_NAMESPACE_BEGIN
+
+//----------------------------------------------------------------------------
+//
+//  ScriptSet implementation
+//
+//----------------------------------------------------------------------------
+ScriptSet::ScriptSet() {
+    uprv_memset(bits, 0, sizeof(bits));
+}
+
+ScriptSet::~ScriptSet() {
+}
+
+ScriptSet::ScriptSet(const ScriptSet &other) {
+    *this = other;
+}
+
+ScriptSet & ScriptSet::operator =(const ScriptSet &other) {
+    uprv_memcpy(bits, other.bits, sizeof(bits));
+    return *this;
+}
+
+bool ScriptSet::operator == (const ScriptSet &other) const {
+    for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
+        if (bits[i] != other.bits[i]) {
+            return false;
+        }
+    }
+    return true;
+}
+
+UBool ScriptSet::test(UScriptCode script, UErrorCode &status) const {
+    if (U_FAILURE(status)) {
+        return FALSE;
+    }
+    if (script < 0 || (int32_t)script >= SCRIPT_LIMIT) {
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+        return FALSE;
+    }
+    uint32_t index = script / 32;
+    uint32_t bit   = 1 << (script & 31);
+    return ((bits[index] & bit) != 0);
+}
+
+
+ScriptSet &ScriptSet::set(UScriptCode script, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return *this;
+    }
+    if (script < 0 || (int32_t)script >= SCRIPT_LIMIT) {
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+        return *this;
+    }
+    uint32_t index = script / 32;
+    uint32_t bit   = 1 << (script & 31);
+    bits[index] |= bit;
+    return *this;
+}
+
+ScriptSet &ScriptSet::reset(UScriptCode script, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return *this;
+    }
+    if (script < 0 || (int32_t)script >= SCRIPT_LIMIT) {
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+        return *this;
+    }
+    uint32_t index = script / 32;
+    uint32_t bit   = 1 << (script & 31);
+    bits[index] &= ~bit;
+    return *this;
+}
+
+
+
+ScriptSet &ScriptSet::Union(const ScriptSet &other) {
+    for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
+        bits[i] |= other.bits[i];
+    }
+    return *this;
+}
+
+ScriptSet &ScriptSet::intersect(const ScriptSet &other) {
+    for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
+        bits[i] &= other.bits[i];
+    }
+    return *this;
+}
+
+ScriptSet &ScriptSet::intersect(UScriptCode script, UErrorCode &status) {
+    ScriptSet t;
+    t.set(script, status);
+    if (U_SUCCESS(status)) {
+        this->intersect(t);
+    }
+    return *this;
+}
+
+UBool ScriptSet::intersects(const ScriptSet &other) const {
+    for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
+        if ((bits[i] & other.bits[i]) != 0) {
+            return true;
+        }
+    }
+    return false;
+}
+
+UBool ScriptSet::contains(const ScriptSet &other) const {
+    ScriptSet t(*this);
+    t.intersect(other);
+    return (t == other);
+}
+
+
+ScriptSet &ScriptSet::setAll() {
+    for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
+        bits[i] = 0xffffffffu;
+    }
+    return *this;
+}
+
+
+ScriptSet &ScriptSet::resetAll() {
+    uprv_memset(bits, 0, sizeof(bits));
+    return *this;
+}
+
+int32_t ScriptSet::countMembers() const {
+    // This bit counter is good for sparse numbers of '1's, which is
+    //  very much the case that we will usually have.
+    int32_t count = 0;
+    for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
+        uint32_t x = bits[i];
+        while (x > 0) {
+            count++;
+            x &= (x - 1);    // and off the least significant one bit.
+        }
+    }
+    return count;
+}
+
+int32_t ScriptSet::hashCode() const {
+    int32_t hash = 0;
+    for (int32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
+        hash ^= bits[i];
+    }
+    return hash;
+}
+
+int32_t ScriptSet::nextSetBit(int32_t fromIndex) const {
+    // TODO: Wants a better implementation.
+    if (fromIndex < 0) {
+        return -1;
+    }
+    UErrorCode status = U_ZERO_ERROR;
+    for (int32_t scriptIndex = fromIndex; scriptIndex < SCRIPT_LIMIT; scriptIndex++) {
+        if (test((UScriptCode)scriptIndex, status)) {
+            return scriptIndex;
+        }
+    }
+    return -1;
+}
+
+UBool ScriptSet::isEmpty() const {
+    for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
+        if (bits[i] != 0) {
+            return FALSE;
+        }
+    }
+    return TRUE;
+}
+
+UnicodeString &ScriptSet::displayScripts(UnicodeString &dest) const {
+    UBool firstTime = TRUE;
+    for (int32_t i = nextSetBit(0); i >= 0; i = nextSetBit(i + 1)) {
+        if (!firstTime) {
+            dest.append((UChar)0x20);
+        }
+        firstTime = FALSE;
+        const char *scriptName = uscript_getShortName((UScriptCode(i)));
+        dest.append(UnicodeString(scriptName, -1, US_INV));
+    }
+    return dest;
+}
+
+ScriptSet &ScriptSet::parseScripts(const UnicodeString &scriptString, UErrorCode &status) {
+    resetAll();
+    if (U_FAILURE(status)) {
+        return *this;
+    }
+    UnicodeString oneScriptName;
+    for (int32_t i=0; i<scriptString.length();) {
+        UChar32 c = scriptString.char32At(i);
+        i = scriptString.moveIndex32(i, 1);
+        if (!u_isUWhiteSpace(c)) {
+            oneScriptName.append(c);
+            if (i < scriptString.length()) {
+                continue;
+            }
+        }
+        if (oneScriptName.length() > 0) {
+            char buf[40];
+            oneScriptName.extract(0, oneScriptName.length(), buf, sizeof(buf)-1, US_INV);
+            buf[sizeof(buf)-1] = 0;
+            int32_t sc = u_getPropertyValueEnum(UCHAR_SCRIPT, buf);
+            if (sc == UCHAR_INVALID_CODE) {
+                status = U_ILLEGAL_ARGUMENT_ERROR;
+            } else {
+                this->set((UScriptCode)sc, status);
+            }
+            if (U_FAILURE(status)) {
+                return *this;
+            }
+            oneScriptName.remove();
+        }
+    }
+    return *this;
+}
+
+void ScriptSet::setScriptExtensions(UChar32 codePoint, UErrorCode& status) {
+    if (U_FAILURE(status)) { return; }
+    static const int32_t FIRST_GUESS_SCRIPT_CAPACITY = 20;
+    MaybeStackArray<UScriptCode,FIRST_GUESS_SCRIPT_CAPACITY> scripts;
+    UErrorCode internalStatus = U_ZERO_ERROR;
+    int32_t script_count = -1;
+
+    while (TRUE) {
+        script_count = uscript_getScriptExtensions(
+            codePoint, scripts.getAlias(), scripts.getCapacity(), &internalStatus);
+        if (internalStatus == U_BUFFER_OVERFLOW_ERROR) {
+            // Need to allocate more space
+            if (scripts.resize(script_count) == NULL) {
+                status = U_MEMORY_ALLOCATION_ERROR;
+                return;
+            }
+            internalStatus = U_ZERO_ERROR;
+        } else {
+            break;
+        }
+    }
+
+    // Check if we failed for some reason other than buffer overflow
+    if (U_FAILURE(internalStatus)) {
+        status = internalStatus;
+        return;
+    }
+
+    // Load the scripts into the ScriptSet and return
+    for (int32_t i = 0; i < script_count; i++) {
+        this->set(scripts[i], status);
+        if (U_FAILURE(status)) { return; }
+    }
+}
+
+U_NAMESPACE_END
+
+U_CAPI UBool U_EXPORT2
+uhash_equalsScriptSet(const UElement key1, const UElement key2) {
+    icu::ScriptSet *s1 = static_cast<icu::ScriptSet *>(key1.pointer);
+    icu::ScriptSet *s2 = static_cast<icu::ScriptSet *>(key2.pointer);
+    return (*s1 == *s2);
+}
+
+U_CAPI int8_t U_EXPORT2
+uhash_compareScriptSet(UElement key0, UElement key1) {
+    icu::ScriptSet *s0 = static_cast<icu::ScriptSet *>(key0.pointer);
+    icu::ScriptSet *s1 = static_cast<icu::ScriptSet *>(key1.pointer);
+    int32_t diff = s0->countMembers() - s1->countMembers();
+    if (diff != 0) return static_cast<UBool>(diff);
+    int32_t i0 = s0->nextSetBit(0);
+    int32_t i1 = s1->nextSetBit(0);
+    while ((diff = i0-i1) == 0 && i0 > 0) {
+        i0 = s0->nextSetBit(i0+1);
+        i1 = s1->nextSetBit(i1+1);
+    }
+    return (int8_t)diff;
+}
+
+U_CAPI int32_t U_EXPORT2
+uhash_hashScriptSet(const UElement key) {
+    icu::ScriptSet *s = static_cast<icu::ScriptSet *>(key.pointer);
+    return s->hashCode();
+}
+
+U_CAPI void U_EXPORT2
+uhash_deleteScriptSet(void *obj) {
+    icu::ScriptSet *s = static_cast<icu::ScriptSet *>(obj);
+    delete s;
+}
diff --git a/thirdparty/icu4c/i18n/scriptset.h b/thirdparty/icu4c/i18n/scriptset.h
new file mode 100644
index 0000000000..51980ab7b3
--- /dev/null
+++ b/thirdparty/icu4c/i18n/scriptset.h
@@ -0,0 +1,86 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+*   Copyright (C) 2013, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*
+* scriptset.h
+*
+* created on: 2013 Jan 7
+* created by: Andy Heninger
+*/
+
+#ifndef __SCRIPTSET_H__
+#define __SCRIPTSET_H__
+
+#include "unicode/utypes.h"
+#include "unicode/uobject.h"
+#include "unicode/uscript.h"
+
+#include "uelement.h"
+
+U_NAMESPACE_BEGIN
+
+//-------------------------------------------------------------------------------
+//
+//  ScriptSet - A bit set representing a set of scripts.
+//
+//              This class was originally used exclusively with script sets appearing
+//              as part of the spoof check whole script confusable binary data. Its
+//              use has since become more general, but the continued use to wrap
+//              prebuilt binary data does constrain the design.
+//
+//-------------------------------------------------------------------------------
+class U_I18N_API ScriptSet: public UMemory {
+  public:
+    static constexpr int32_t SCRIPT_LIMIT = 224;  // multiple of 32!
+
+    ScriptSet();
+    ScriptSet(const ScriptSet &other);
+    ~ScriptSet();
+
+    bool operator == (const ScriptSet &other) const;
+    bool operator != (const ScriptSet &other) const {return !(*this == other);}
+    ScriptSet & operator = (const ScriptSet &other);
+
+    UBool      test(UScriptCode script, UErrorCode &status) const;
+    ScriptSet &Union(const ScriptSet &other);
+    ScriptSet &set(UScriptCode script, UErrorCode &status);
+    ScriptSet &reset(UScriptCode script, UErrorCode &status);
+    ScriptSet &intersect(const ScriptSet &other);
+    ScriptSet &intersect(UScriptCode script, UErrorCode &status);
+    UBool      intersects(const ScriptSet &other) const;  // Sets contain at least one script in common.
+    UBool      contains(const ScriptSet &other) const;    // All set bits in other are also set in this.
+
+    ScriptSet &setAll();
+    ScriptSet &resetAll();
+    int32_t countMembers() const;
+    int32_t hashCode() const;
+    int32_t nextSetBit(int32_t script) const;
+
+    UBool isEmpty() const;
+
+    UnicodeString &displayScripts(UnicodeString &dest) const; // append script names to dest string.
+    ScriptSet & parseScripts(const UnicodeString &scriptsString, UErrorCode &status);  // Replaces ScriptSet contents.
+
+    // Wraps around UScript::getScriptExtensions() and adds the corresponding scripts to this instance.
+    void setScriptExtensions(UChar32 codePoint, UErrorCode& status);
+
+  private:
+    uint32_t  bits[SCRIPT_LIMIT / 32];
+};
+
+U_NAMESPACE_END
+
+U_CAPI UBool U_EXPORT2
+uhash_compareScriptSet(const UElement key1, const UElement key2);
+
+U_CAPI int32_t U_EXPORT2
+uhash_hashScriptSet(const UElement key);
+
+U_CAPI void U_EXPORT2
+uhash_deleteScriptSet(void *obj);
+
+#endif // __SCRIPTSET_H__
diff --git a/thirdparty/icu4c/i18n/ucln_in.cpp b/thirdparty/icu4c/i18n/ucln_in.cpp
new file mode 100644
index 0000000000..f29cbe41dd
--- /dev/null
+++ b/thirdparty/icu4c/i18n/ucln_in.cpp
@@ -0,0 +1,65 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+*                                                                            *
+* Copyright (C) 2001-2014, International Business Machines                   *
+*                Corporation and others. All Rights Reserved.                *
+*                                                                            *
+******************************************************************************
+*   file name:  ucln_in.cpp
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2001July05
+*   created by: George Rhoten
+*/
+
+#include "ucln.h"
+#include "ucln_in.h"
+#include "mutex.h"
+#include "uassert.h"
+
+/**  Auto-client for UCLN_I18N **/
+#define UCLN_TYPE UCLN_I18N
+#include "ucln_imp.h"
+
+/* Leave this copyright notice here! It needs to go somewhere in this library. */
+static const char copyright[] = U_COPYRIGHT_STRING;
+
+static cleanupFunc *gCleanupFunctions[UCLN_I18N_COUNT];
+
+static UBool U_CALLCONV i18n_cleanup(void)
+{
+    int32_t libType = UCLN_I18N_START;
+    (void)copyright;   /* Suppress unused variable warning with clang. */
+
+    while (++libType<UCLN_I18N_COUNT) {
+        if (gCleanupFunctions[libType])
+        {
+            gCleanupFunctions[libType]();
+            gCleanupFunctions[libType] = NULL;
+        }
+    }
+#if !UCLN_NO_AUTO_CLEANUP && (defined(UCLN_AUTO_ATEXIT) || defined(UCLN_AUTO_LOCAL))
+    ucln_unRegisterAutomaticCleanup();
+#endif
+    return TRUE;
+}
+
+void ucln_i18n_registerCleanup(ECleanupI18NType type,
+                               cleanupFunc *func) {
+    U_ASSERT(UCLN_I18N_START < type && type < UCLN_I18N_COUNT);
+    {
+        icu::Mutex m;   // See ticket 10295 for discussion.
+        ucln_registerCleanup(UCLN_I18N, i18n_cleanup);
+        if (UCLN_I18N_START < type && type < UCLN_I18N_COUNT) {
+            gCleanupFunctions[type] = func;
+        }
+    }
+#if !UCLN_NO_AUTO_CLEANUP && (defined(UCLN_AUTO_ATEXIT) || defined(UCLN_AUTO_LOCAL))
+    ucln_registerAutomaticCleanup();
+#endif
+}
+
diff --git a/thirdparty/icu4c/i18n/ucln_in.h b/thirdparty/icu4c/i18n/ucln_in.h
new file mode 100644
index 0000000000..765cdd559f
--- /dev/null
+++ b/thirdparty/icu4c/i18n/ucln_in.h
@@ -0,0 +1,74 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+* Copyright (C) 2001-2016, International Business Machines
+*                Corporation and others. All Rights Reserved.
+******************************************************************************
+*   file name:  ucln_in.h
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2001July05
+*   created by: George Rhoten
+*/
+
+#ifndef __UCLN_IN_H__
+#define __UCLN_IN_H__
+
+#include "unicode/utypes.h"
+#include "ucln.h"
+
+/*
+Please keep the order of enums declared in same order
+as the functions are suppose to be called.
+It's usually best to have child dependencies called first. */
+typedef enum ECleanupI18NType {
+    UCLN_I18N_START = -1,
+    UCLN_I18N_UNIT_EXTRAS,
+    UCLN_I18N_NUMBER_SKELETONS,
+    UCLN_I18N_CURRENCY_SPACING,
+    UCLN_I18N_SPOOF,
+    UCLN_I18N_SPOOFDATA,
+    UCLN_I18N_TRANSLITERATOR,
+    UCLN_I18N_REGEX,
+    UCLN_I18N_JAPANESE_CALENDAR,
+    UCLN_I18N_ISLAMIC_CALENDAR,
+    UCLN_I18N_CHINESE_CALENDAR,
+    UCLN_I18N_HEBREW_CALENDAR,
+    UCLN_I18N_ASTRO_CALENDAR,
+    UCLN_I18N_DANGI_CALENDAR,
+    UCLN_I18N_CALENDAR,
+    UCLN_I18N_TIMEZONEFORMAT,
+    UCLN_I18N_TZDBTIMEZONENAMES,
+    UCLN_I18N_TIMEZONEGENERICNAMES,
+    UCLN_I18N_TIMEZONENAMES,
+    UCLN_I18N_ZONEMETA,
+    UCLN_I18N_TIMEZONE,
+    UCLN_I18N_DIGITLIST,
+    UCLN_I18N_DECFMT,
+    UCLN_I18N_NUMFMT,
+    UCLN_I18N_ALLOWED_HOUR_FORMATS,
+    UCLN_I18N_DAYPERIODRULES,
+    UCLN_I18N_SMPDTFMT,
+    UCLN_I18N_USEARCH,
+    UCLN_I18N_COLLATOR,
+    UCLN_I18N_UCOL_RES,
+    UCLN_I18N_CSDET,
+    UCLN_I18N_COLLATION_ROOT,
+    UCLN_I18N_GENDERINFO,
+    UCLN_I18N_CDFINFO,
+    UCLN_I18N_REGION,
+    UCLN_I18N_LIST_FORMATTER,
+    UCLN_I18N_NUMSYS,
+    UCLN_I18N_COUNT /* This must be last */
+} ECleanupI18NType;
+
+/* Main library cleanup registration function. */
+/* See common/ucln.h for details on adding a cleanup function. */
+/* Note: the global mutex must not be held when calling this function. */
+U_CFUNC void U_EXPORT2 ucln_i18n_registerCleanup(ECleanupI18NType type,
+                                                 cleanupFunc *func);
+
+#endif
diff --git a/thirdparty/icu4c/i18n/unicode/uspoof.h b/thirdparty/icu4c/i18n/unicode/uspoof.h
new file mode 100644
index 0000000000..b674c91b2c
--- /dev/null
+++ b/thirdparty/icu4c/i18n/unicode/uspoof.h
@@ -0,0 +1,1577 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+***************************************************************************
+* Copyright (C) 2008-2016, International Business Machines Corporation
+* and others. All Rights Reserved.
+***************************************************************************
+*   file name:  uspoof.h
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2008Feb13
+*   created by: Andy Heninger
+*
+*   Unicode Spoof Detection
+*/
+
+#ifndef USPOOF_H
+#define USPOOF_H
+
+#include "unicode/utypes.h"
+#include "unicode/uset.h"
+#include "unicode/parseerr.h"
+
+#if !UCONFIG_NO_NORMALIZATION
+
+
+#if U_SHOW_CPLUSPLUS_API
+#include "unicode/localpointer.h"
+#include "unicode/unistr.h"
+#include "unicode/uniset.h"
+#endif
+
+
+/**
+ * \file
+ * \brief Unicode Security and Spoofing Detection, C API.
+ *
+ * <p>
+ * This class, based on <a href="http://unicode.org/reports/tr36">Unicode Technical Report #36</a> and
+ * <a href="http://unicode.org/reports/tr39">Unicode Technical Standard #39</a>, has two main functions:
+ *
+ * <ol>
+ * <li>Checking whether two strings are visually <em>confusable</em> with each other, such as "Harvest" and
+ * &quot;&Eta;arvest&quot;, where the second string starts with the Greek capital letter Eta.</li>
+ * <li>Checking whether an individual string is likely to be an attempt at confusing the reader (<em>spoof
+ * detection</em>), such as "paypal" with some Latin characters substituted with Cyrillic look-alikes.</li>
+ * </ol>
+ *
+ * <p>
+ * Although originally designed as a method for flagging suspicious identifier strings such as URLs,
+ * <code>USpoofChecker</code> has a number of other practical use cases, such as preventing attempts to evade bad-word
+ * content filters.
+ *
+ * <p>
+ * The functions of this class are exposed as C API, with a handful of syntactical conveniences for C++.
+ *
+ * <h2>Confusables</h2>
+ *
+ * <p>
+ * The following example shows how to use <code>USpoofChecker</code> to check for confusability between two strings:
+ *
+ * \code{.c}
+ * UErrorCode status = U_ZERO_ERROR;
+ * UChar* str1 = (UChar*) u"Harvest";
+ * UChar* str2 = (UChar*) u"\u0397arvest";  // with U+0397 GREEK CAPITAL LETTER ETA
+ *
+ * USpoofChecker* sc = uspoof_open(&status);
+ * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status);
+ *
+ * int32_t bitmask = uspoof_areConfusable(sc, str1, -1, str2, -1, &status);
+ * UBool result = bitmask != 0;
+ * // areConfusable: 1 (status: U_ZERO_ERROR)
+ * printf("areConfusable: %d (status: %s)\n", result, u_errorName(status));
+ * uspoof_close(sc);
+ * \endcode
+ *
+ * <p>
+ * The call to {@link uspoof_open} creates a <code>USpoofChecker</code> object; the call to {@link uspoof_setChecks}
+ * enables confusable checking and disables all other checks; the call to {@link uspoof_areConfusable} performs the
+ * confusability test; and the following line extracts the result out of the return value. For best performance,
+ * the instance should be created once (e.g., upon application startup), and the efficient
+ * {@link uspoof_areConfusable} method can be used at runtime.
+ *
+ * <p>
+ * The type {@link LocalUSpoofCheckerPointer} is exposed for C++ programmers.  It will automatically call
+ * {@link uspoof_close} when the object goes out of scope:
+ *
+ * \code{.cpp}
+ * UErrorCode status = U_ZERO_ERROR;
+ * LocalUSpoofCheckerPointer sc(uspoof_open(&status));
+ * uspoof_setChecks(sc.getAlias(), USPOOF_CONFUSABLE, &status);
+ * // ...
+ * \endcode
+ *
+ * UTS 39 defines two strings to be <em>confusable</em> if they map to the same <em>skeleton string</em>. A skeleton can
+ * be thought of as a "hash code". {@link uspoof_getSkeleton} computes the skeleton for a particular string, so
+ * the following snippet is equivalent to the example above:
+ *
+ * \code{.c}
+ * UErrorCode status = U_ZERO_ERROR;
+ * UChar* str1 = (UChar*) u"Harvest";
+ * UChar* str2 = (UChar*) u"\u0397arvest";  // with U+0397 GREEK CAPITAL LETTER ETA
+ *
+ * USpoofChecker* sc = uspoof_open(&status);
+ * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status);
+ *
+ * // Get skeleton 1
+ * int32_t skel1Len = uspoof_getSkeleton(sc, 0, str1, -1, NULL, 0, &status);
+ * UChar* skel1 = (UChar*) malloc(++skel1Len * sizeof(UChar));
+ * status = U_ZERO_ERROR;
+ * uspoof_getSkeleton(sc, 0, str1, -1, skel1, skel1Len, &status);
+ *
+ * // Get skeleton 2
+ * int32_t skel2Len = uspoof_getSkeleton(sc, 0, str2, -1, NULL, 0, &status);
+ * UChar* skel2 = (UChar*) malloc(++skel2Len * sizeof(UChar));
+ * status = U_ZERO_ERROR;
+ * uspoof_getSkeleton(sc, 0, str2, -1, skel2, skel2Len, &status);
+ *
+ * // Are the skeletons the same?
+ * UBool result = u_strcmp(skel1, skel2) == 0;
+ * // areConfusable: 1 (status: U_ZERO_ERROR)
+ * printf("areConfusable: %d (status: %s)\n", result, u_errorName(status));
+ * uspoof_close(sc);
+ * free(skel1);
+ * free(skel2);
+ * \endcode
+ *
+ * If you need to check if a string is confusable with any string in a dictionary of many strings, rather than calling
+ * {@link uspoof_areConfusable} many times in a loop, {@link uspoof_getSkeleton} can be used instead, as shown below:
+ *
+ * \code{.c}
+ * UErrorCode status = U_ZERO_ERROR;
+ * #define DICTIONARY_LENGTH 2
+ * UChar* dictionary[DICTIONARY_LENGTH] = { (UChar*) u"lorem", (UChar*) u"ipsum" };
+ * UChar* skeletons[DICTIONARY_LENGTH];
+ * UChar* str = (UChar*) u"1orern";
+ *
+ * // Setup:
+ * USpoofChecker* sc = uspoof_open(&status);
+ * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status);
+ * for (size_t i=0; i<DICTIONARY_LENGTH; i++) {
+ *     UChar* word = dictionary[i];
+ *     int32_t len = uspoof_getSkeleton(sc, 0, word, -1, NULL, 0, &status);
+ *     skeletons[i] = (UChar*) malloc(++len * sizeof(UChar));
+ *     status = U_ZERO_ERROR;
+ *     uspoof_getSkeleton(sc, 0, word, -1, skeletons[i], len, &status);
+ * }
+ *
+ * // Live Check:
+ * {
+ *     int32_t len = uspoof_getSkeleton(sc, 0, str, -1, NULL, 0, &status);
+ *     UChar* skel = (UChar*) malloc(++len * sizeof(UChar));
+ *     status = U_ZERO_ERROR;
+ *     uspoof_getSkeleton(sc, 0, str, -1, skel, len, &status);
+ *     UBool result = false;
+ *     for (size_t i=0; i<DICTIONARY_LENGTH; i++) {
+ *         result = u_strcmp(skel, skeletons[i]) == 0;
+ *         if (result == true) { break; }
+ *     }
+ *     // Has confusable in dictionary: 1 (status: U_ZERO_ERROR)
+ *     printf("Has confusable in dictionary: %d (status: %s)\n", result, u_errorName(status));
+ *     free(skel);
+ * }
+ *
+ * for (size_t i=0; i<DICTIONARY_LENGTH; i++) {
+ *     free(skeletons[i]);
+ * }
+ * uspoof_close(sc);
+ * \endcode
+ *
+ * <b>Note:</b> Since the Unicode confusables mapping table is frequently updated, confusable skeletons are <em>not</em>
+ * guaranteed to be the same between ICU releases. We therefore recommend that you always compute confusable skeletons
+ * at runtime and do not rely on creating a permanent, or difficult to update, database of skeletons.
+ *
+ * <h2>Spoof Detection</h2>
+ *
+ * The following snippet shows a minimal example of using <code>USpoofChecker</code> to perform spoof detection on a
+ * string:
+ *
+ * \code{.c}
+ * UErrorCode status = U_ZERO_ERROR;
+ * UChar* str = (UChar*) u"p\u0430ypal";  // with U+0430 CYRILLIC SMALL LETTER A
+ *
+ * // Get the default set of allowable characters:
+ * USet* allowed = uset_openEmpty();
+ * uset_addAll(allowed, uspoof_getRecommendedSet(&status));
+ * uset_addAll(allowed, uspoof_getInclusionSet(&status));
+ *
+ * USpoofChecker* sc = uspoof_open(&status);
+ * uspoof_setAllowedChars(sc, allowed, &status);
+ * uspoof_setRestrictionLevel(sc, USPOOF_MODERATELY_RESTRICTIVE);
+ *
+ * int32_t bitmask = uspoof_check(sc, str, -1, NULL, &status);
+ * UBool result = bitmask != 0;
+ * // fails checks: 1 (status: U_ZERO_ERROR)
+ * printf("fails checks: %d (status: %s)\n", result, u_errorName(status));
+ * uspoof_close(sc);
+ * uset_close(allowed);
+ * \endcode
+ *
+ * As in the case for confusability checking, it is good practice to create one <code>USpoofChecker</code> instance at
+ * startup, and call the cheaper {@link uspoof_check} online. We specify the set of
+ * allowed characters to be those with type RECOMMENDED or INCLUSION, according to the recommendation in UTS 39.
+ *
+ * In addition to {@link uspoof_check}, the function {@link uspoof_checkUTF8} is exposed for UTF8-encoded char* strings,
+ * and {@link uspoof_checkUnicodeString} is exposed for C++ programmers.
+ *
+ * If the {@link USPOOF_AUX_INFO} check is enabled, a limited amount of information on why a string failed the checks
+ * is available in the returned bitmask.  For complete information, use the {@link uspoof_check2} class of functions
+ * with a {@link USpoofCheckResult} parameter:
+ *
+ * \code{.c}
+ * UErrorCode status = U_ZERO_ERROR;
+ * UChar* str = (UChar*) u"p\u0430ypal";  // with U+0430 CYRILLIC SMALL LETTER A
+ *
+ * // Get the default set of allowable characters:
+ * USet* allowed = uset_openEmpty();
+ * uset_addAll(allowed, uspoof_getRecommendedSet(&status));
+ * uset_addAll(allowed, uspoof_getInclusionSet(&status));
+ *
+ * USpoofChecker* sc = uspoof_open(&status);
+ * uspoof_setAllowedChars(sc, allowed, &status);
+ * uspoof_setRestrictionLevel(sc, USPOOF_MODERATELY_RESTRICTIVE);
+ *
+ * USpoofCheckResult* checkResult = uspoof_openCheckResult(&status);
+ * int32_t bitmask = uspoof_check2(sc, str, -1, checkResult, &status);
+ *
+ * int32_t failures1 = bitmask;
+ * int32_t failures2 = uspoof_getCheckResultChecks(checkResult, &status);
+ * assert(failures1 == failures2);
+ * // checks that failed: 0x00000010 (status: U_ZERO_ERROR)
+ * printf("checks that failed: %#010x (status: %s)\n", failures1, u_errorName(status));
+ *
+ * // Cleanup:
+ * uspoof_close(sc);
+ * uset_close(allowed);
+ * uspoof_closeCheckResult(checkResult);
+ * \endcode
+ *
+ * C++ users can take advantage of a few syntactical conveniences.  The following snippet is functionally
+ * equivalent to the one above:
+ *
+ * \code{.cpp}
+ * UErrorCode status = U_ZERO_ERROR;
+ * UnicodeString str((UChar*) u"p\u0430ypal");  // with U+0430 CYRILLIC SMALL LETTER A
+ *
+ * // Get the default set of allowable characters:
+ * UnicodeSet allowed;
+ * allowed.addAll(*uspoof_getRecommendedUnicodeSet(&status));
+ * allowed.addAll(*uspoof_getInclusionUnicodeSet(&status));
+ *
+ * LocalUSpoofCheckerPointer sc(uspoof_open(&status));
+ * uspoof_setAllowedChars(sc.getAlias(), allowed.toUSet(), &status);
+ * uspoof_setRestrictionLevel(sc.getAlias(), USPOOF_MODERATELY_RESTRICTIVE);
+ *
+ * LocalUSpoofCheckResultPointer checkResult(uspoof_openCheckResult(&status));
+ * int32_t bitmask = uspoof_check2UnicodeString(sc.getAlias(), str, checkResult.getAlias(), &status);
+ *
+ * int32_t failures1 = bitmask;
+ * int32_t failures2 = uspoof_getCheckResultChecks(checkResult.getAlias(), &status);
+ * assert(failures1 == failures2);
+ * // checks that failed: 0x00000010 (status: U_ZERO_ERROR)
+ * printf("checks that failed: %#010x (status: %s)\n", failures1, u_errorName(status));
+ *
+ * // Explicit cleanup not necessary.
+ * \endcode
+ *
+ * The return value is a bitmask of the checks that failed. In this case, there was one check that failed:
+ * {@link USPOOF_RESTRICTION_LEVEL}, corresponding to the fifth bit (16). The possible checks are:
+ *
+ * <ul>
+ * <li><code>RESTRICTION_LEVEL</code>: flags strings that violate the
+ * <a href="http://unicode.org/reports/tr39/#Restriction_Level_Detection">Restriction Level</a> test as specified in UTS
+ * 39; in most cases, this means flagging strings that contain characters from multiple different scripts.</li>
+ * <li><code>INVISIBLE</code>: flags strings that contain invisible characters, such as zero-width spaces, or character
+ * sequences that are likely not to display, such as multiple occurrences of the same non-spacing mark.</li>
+ * <li><code>CHAR_LIMIT</code>: flags strings that contain characters outside of a specified set of acceptable
+ * characters. See {@link uspoof_setAllowedChars} and {@link uspoof_setAllowedLocales}.</li>
+ * <li><code>MIXED_NUMBERS</code>: flags strings that contain digits from multiple different numbering systems.</li>
+ * </ul>
+ *
+ * <p>
+ * These checks can be enabled independently of each other. For example, if you were interested in checking for only the
+ * INVISIBLE and MIXED_NUMBERS conditions, you could do:
+ *
+ * \code{.c}
+ * UErrorCode status = U_ZERO_ERROR;
+ * UChar* str = (UChar*) u"8\u09EA";  // 8 mixed with U+09EA BENGALI DIGIT FOUR
+ *
+ * USpoofChecker* sc = uspoof_open(&status);
+ * uspoof_setChecks(sc, USPOOF_INVISIBLE | USPOOF_MIXED_NUMBERS, &status);
+ *
+ * int32_t bitmask = uspoof_check2(sc, str, -1, NULL, &status);
+ * UBool result = bitmask != 0;
+ * // fails checks: 1 (status: U_ZERO_ERROR)
+ * printf("fails checks: %d (status: %s)\n", result, u_errorName(status));
+ * uspoof_close(sc);
+ * \endcode
+ *
+ * Here is an example in C++ showing how to compute the restriction level of a string:
+ *
+ * \code{.cpp}
+ * UErrorCode status = U_ZERO_ERROR;
+ * UnicodeString str((UChar*) u"p\u0430ypal");  // with U+0430 CYRILLIC SMALL LETTER A
+ *
+ * // Get the default set of allowable characters:
+ * UnicodeSet allowed;
+ * allowed.addAll(*uspoof_getRecommendedUnicodeSet(&status));
+ * allowed.addAll(*uspoof_getInclusionUnicodeSet(&status));
+ *
+ * LocalUSpoofCheckerPointer sc(uspoof_open(&status));
+ * uspoof_setAllowedChars(sc.getAlias(), allowed.toUSet(), &status);
+ * uspoof_setRestrictionLevel(sc.getAlias(), USPOOF_MODERATELY_RESTRICTIVE);
+ * uspoof_setChecks(sc.getAlias(), USPOOF_RESTRICTION_LEVEL | USPOOF_AUX_INFO, &status);
+ *
+ * LocalUSpoofCheckResultPointer checkResult(uspoof_openCheckResult(&status));
+ * int32_t bitmask = uspoof_check2UnicodeString(sc.getAlias(), str, checkResult.getAlias(), &status);
+ *
+ * URestrictionLevel restrictionLevel = uspoof_getCheckResultRestrictionLevel(checkResult.getAlias(), &status);
+ * // Since USPOOF_AUX_INFO was enabled, the restriction level is also available in the upper bits of the bitmask:
+ * assert((restrictionLevel & bitmask) == restrictionLevel);
+ * // Restriction level: 0x50000000 (status: U_ZERO_ERROR)
+ * printf("Restriction level: %#010x (status: %s)\n", restrictionLevel, u_errorName(status));
+ * \endcode
+ *
+ * The code '0x50000000' corresponds to the restriction level USPOOF_MINIMALLY_RESTRICTIVE.  Since
+ * USPOOF_MINIMALLY_RESTRICTIVE is weaker than USPOOF_MODERATELY_RESTRICTIVE, the string fails the check.
+ *
+ * <b>Note:</b> The Restriction Level is the most powerful of the checks. The full logic is documented in
+ * <a href="http://unicode.org/reports/tr39/#Restriction_Level_Detection">UTS 39</a>, but the basic idea is that strings
+ * are restricted to contain characters from only a single script, <em>except</em> that most scripts are allowed to have
+ * Latin characters interspersed. Although the default restriction level is <code>HIGHLY_RESTRICTIVE</code>, it is
+ * recommended that users set their restriction level to <code>MODERATELY_RESTRICTIVE</code>, which allows Latin mixed
+ * with all other scripts except Cyrillic, Greek, and Cherokee, with which it is often confusable. For more details on
+ * the levels, see UTS 39 or {@link URestrictionLevel}. The Restriction Level test is aware of the set of
+ * allowed characters set in {@link uspoof_setAllowedChars}. Note that characters which have script code
+ * COMMON or INHERITED, such as numbers and punctuation, are ignored when computing whether a string has multiple
+ * scripts.
+ *
+ * <h2>Additional Information</h2>
+ *
+ * A <code>USpoofChecker</code> instance may be used repeatedly to perform checks on any number of identifiers.
+ *
+ * <b>Thread Safety:</b> The test functions for checking a single identifier, or for testing whether
+ * two identifiers are possible confusable, are thread safe. They may called concurrently, from multiple threads,
+ * using the same USpoofChecker instance.
+ *
+ * More generally, the standard ICU thread safety rules apply: functions that take a const USpoofChecker parameter are
+ * thread safe. Those that take a non-const USpoofChecker are not thread safe..
+ *
+ * @stable ICU 4.6
+ */
+
+U_CDECL_BEGIN
+
+struct USpoofChecker;
+/**
+ * @stable ICU 4.2
+ */
+typedef struct USpoofChecker USpoofChecker; /**< typedef for C of USpoofChecker */
+
+struct USpoofCheckResult;
+/**
+ * @see uspoof_openCheckResult
+ * @stable ICU 58
+ */
+typedef struct USpoofCheckResult USpoofCheckResult;
+
+/**
+ * Enum for the kinds of checks that USpoofChecker can perform.
+ * These enum values are used both to select the set of checks that
+ * will be performed, and to report results from the check function.
+ *
+ * @stable ICU 4.2
+ */
+typedef enum USpoofChecks {
+    /**
+     * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates
+     * that the two strings are visually confusable and that they are from the same script, according to UTS 39 section
+     * 4.
+     *
+     * @see uspoof_areConfusable
+     * @stable ICU 4.2
+     */
+    USPOOF_SINGLE_SCRIPT_CONFUSABLE =   1,
+
+    /**
+     * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates
+     * that the two strings are visually confusable and that they are <b>not</b> from the same script, according to UTS
+     * 39 section 4.
+     *
+     * @see uspoof_areConfusable
+     * @stable ICU 4.2
+     */
+    USPOOF_MIXED_SCRIPT_CONFUSABLE  =   2,
+
+    /**
+     * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates
+     * that the two strings are visually confusable and that they are not from the same script but both of them are
+     * single-script strings, according to UTS 39 section 4.
+     *
+     * @see uspoof_areConfusable
+     * @stable ICU 4.2
+     */
+    USPOOF_WHOLE_SCRIPT_CONFUSABLE  =   4,
+
+    /**
+     * Enable this flag in {@link uspoof_setChecks} to turn on all types of confusables.  You may set
+     * the checks to some subset of SINGLE_SCRIPT_CONFUSABLE, MIXED_SCRIPT_CONFUSABLE, or WHOLE_SCRIPT_CONFUSABLE to
+     * make {@link uspoof_areConfusable} return only those types of confusables.
+     *
+     * @see uspoof_areConfusable
+     * @see uspoof_getSkeleton
+     * @stable ICU 58
+     */
+    USPOOF_CONFUSABLE               =   USPOOF_SINGLE_SCRIPT_CONFUSABLE | USPOOF_MIXED_SCRIPT_CONFUSABLE | USPOOF_WHOLE_SCRIPT_CONFUSABLE,
+
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+      * This flag is deprecated and no longer affects the behavior of SpoofChecker.
+      *
+      * @deprecated ICU 58  Any case confusable mappings were removed from UTS 39; the corresponding ICU API was deprecated.
+      */
+    USPOOF_ANY_CASE                 =   8,
+#endif  /* U_HIDE_DEPRECATED_API */
+
+    /**
+      * Check that an identifier is no looser than the specified RestrictionLevel.
+      * The default if {@link uspoof_setRestrictionLevel} is not called is HIGHLY_RESTRICTIVE.
+      *
+      * If USPOOF_AUX_INFO is enabled the actual restriction level of the
+      * identifier being tested will also be returned by uspoof_check().
+      *
+      * @see URestrictionLevel
+      * @see uspoof_setRestrictionLevel
+      * @see USPOOF_AUX_INFO
+      *
+      * @stable ICU 51
+      */
+    USPOOF_RESTRICTION_LEVEL        = 16,
+
+#ifndef U_HIDE_DEPRECATED_API
+    /** Check that an identifier contains only characters from a
+      * single script (plus chars from the common and inherited scripts.)
+      * Applies to checks of a single identifier check only.
+      * @deprecated ICU 51  Use RESTRICTION_LEVEL instead.
+      */
+    USPOOF_SINGLE_SCRIPT            =  USPOOF_RESTRICTION_LEVEL,
+#endif  /* U_HIDE_DEPRECATED_API */
+
+    /** Check an identifier for the presence of invisible characters,
+      * such as zero-width spaces, or character sequences that are
+      * likely not to display, such as multiple occurrences of the same
+      * non-spacing mark.  This check does not test the input string as a whole
+      * for conformance to any particular syntax for identifiers.
+      */
+    USPOOF_INVISIBLE                =  32,
+
+    /** Check that an identifier contains only characters from a specified set
+      * of acceptable characters.  See {@link uspoof_setAllowedChars} and
+      * {@link uspoof_setAllowedLocales}.  Note that a string that fails this check
+      * will also fail the {@link USPOOF_RESTRICTION_LEVEL} check.
+      */
+    USPOOF_CHAR_LIMIT               =  64,
+
+    /**
+     * Check that an identifier does not mix numbers from different numbering systems.
+     * For more information, see UTS 39 section 5.3.
+     *
+     * @stable ICU 51
+     */
+    USPOOF_MIXED_NUMBERS            = 128,
+
+    /**
+     * Check that an identifier does not have a combining character following a character in which that
+     * combining character would be hidden; for example 'i' followed by a U+0307 combining dot.
+     *
+     * More specifically, the following characters are forbidden from preceding a U+0307:
+     * <ul>
+     * <li>Those with the Soft_Dotted Unicode property (which includes 'i' and 'j')</li>
+     * <li>Latin lowercase letter 'l'</li>
+     * <li>Dotless 'i' and 'j' ('ı' and 'ȷ', U+0131 and U+0237)</li>
+     * <li>Any character whose confusable prototype ends with such a character
+     * (Soft_Dotted, 'l', 'ı', or 'ȷ')</li>
+     * </ul>
+     * In addition, combining characters are allowed between the above characters and U+0307 except those
+     * with combining class 0 or combining class "Above" (230, same class as U+0307).
+     *
+     * This list and the number of combing characters considered by this check may grow over time.
+     *
+     * @stable ICU 62
+     */
+    USPOOF_HIDDEN_OVERLAY            = 256,
+
+   /**
+     * Enable all spoof checks.
+     *
+     * @stable ICU 4.6
+     */
+    USPOOF_ALL_CHECKS               = 0xFFFF,
+
+    /**
+      * Enable the return of auxiliary (non-error) information in the
+      * upper bits of the check results value.
+      *
+      * If this "check" is not enabled, the results of {@link uspoof_check} will be
+      * zero when an identifier passes all of the enabled checks.
+      *
+      * If this "check" is enabled, (uspoof_check() & {@link USPOOF_ALL_CHECKS}) will
+      * be zero when an identifier passes all checks.
+      *
+      * @stable ICU 51
+      */
+    USPOOF_AUX_INFO                  = 0x40000000
+
+    } USpoofChecks;
+
+
+    /**
+     * Constants from UAX #39 for use in {@link uspoof_setRestrictionLevel}, and
+     * for returned identifier restriction levels in check results.
+     *
+     * @stable ICU 51
+     *
+     * @see uspoof_setRestrictionLevel
+     * @see uspoof_check
+     */
+    typedef enum URestrictionLevel {
+        /**
+         * All characters in the string are in the identifier profile and all characters in the string are in the
+         * ASCII range.
+         *
+         * @stable ICU 51
+         */
+        USPOOF_ASCII = 0x10000000,
+        /**
+         * The string classifies as ASCII-Only, or all characters in the string are in the identifier profile and
+         * the string is single-script, according to the definition in UTS 39 section 5.1.
+         *
+         * @stable ICU 53
+         */
+        USPOOF_SINGLE_SCRIPT_RESTRICTIVE = 0x20000000,
+        /**
+         * The string classifies as Single Script, or all characters in the string are in the identifier profile and
+         * the string is covered by any of the following sets of scripts, according to the definition in UTS 39
+         * section 5.1:
+         * <ul>
+         *   <li>Latin + Han + Bopomofo (or equivalently: Latn + Hanb)</li>
+         *   <li>Latin + Han + Hiragana + Katakana (or equivalently: Latn + Jpan)</li>
+         *   <li>Latin + Han + Hangul (or equivalently: Latn +Kore)</li>
+         * </ul>
+         * This is the default restriction in ICU.
+         *
+         * @stable ICU 51
+         */
+        USPOOF_HIGHLY_RESTRICTIVE = 0x30000000,
+        /**
+         * The string classifies as Highly Restrictive, or all characters in the string are in the identifier profile
+         * and the string is covered by Latin and any one other Recommended or Aspirational script, except Cyrillic,
+         * Greek, and Cherokee.
+         *
+         * @stable ICU 51
+         */
+        USPOOF_MODERATELY_RESTRICTIVE = 0x40000000,
+        /**
+         * All characters in the string are in the identifier profile.  Allow arbitrary mixtures of scripts.
+         *
+         * @stable ICU 51
+         */
+        USPOOF_MINIMALLY_RESTRICTIVE = 0x50000000,
+        /**
+         * Any valid identifiers, including characters outside of the Identifier Profile.
+         *
+         * @stable ICU 51
+         */
+        USPOOF_UNRESTRICTIVE = 0x60000000,
+        /**
+         * Mask for selecting the Restriction Level bits from the return value of {@link uspoof_check}.
+         *
+         * @stable ICU 53
+         */
+        USPOOF_RESTRICTION_LEVEL_MASK = 0x7F000000,
+#ifndef U_HIDE_INTERNAL_API
+        /**
+         * An undefined restriction level.
+         * @internal
+         */
+        USPOOF_UNDEFINED_RESTRICTIVE = -1
+#endif  /* U_HIDE_INTERNAL_API */
+    } URestrictionLevel;
+
+/**
+ *  Create a Unicode Spoof Checker, configured to perform all
+ *  checks except for USPOOF_LOCALE_LIMIT and USPOOF_CHAR_LIMIT.
+ *  Note that additional checks may be added in the future,
+ *  resulting in the changes to the default checking behavior.
+ *
+ *  @param status  The error code, set if this function encounters a problem.
+ *  @return        the newly created Spoof Checker
+ *  @stable ICU 4.2
+ */
+U_CAPI USpoofChecker * U_EXPORT2
+uspoof_open(UErrorCode *status);
+
+
+/**
+ * Open a Spoof checker from its serialized form, stored in 32-bit-aligned memory.
+ * Inverse of uspoof_serialize().
+ * The memory containing the serialized data must remain valid and unchanged
+ * as long as the spoof checker, or any cloned copies of the spoof checker,
+ * are in use.  Ownership of the memory remains with the caller.
+ * The spoof checker (and any clones) must be closed prior to deleting the
+ * serialized data.
+ *
+ * @param data a pointer to 32-bit-aligned memory containing the serialized form of spoof data
+ * @param length the number of bytes available at data;
+ *               can be more than necessary
+ * @param pActualLength receives the actual number of bytes at data taken up by the data;
+ *                      can be NULL
+ * @param pErrorCode ICU error code
+ * @return the spoof checker.
+ *
+ * @see uspoof_open
+ * @see uspoof_serialize
+ * @stable ICU 4.2
+ */
+U_CAPI USpoofChecker * U_EXPORT2
+uspoof_openFromSerialized(const void *data, int32_t length, int32_t *pActualLength,
+                          UErrorCode *pErrorCode);
+
+/**
+  * Open a Spoof Checker from the source form of the spoof data.
+  * The input corresponds to the Unicode data file confusables.txt
+  * as described in Unicode UAX #39.  The syntax of the source data
+  * is as described in UAX #39 for this file, and the content of
+  * this file is acceptable input.
+  *
+  * The character encoding of the (char *) input text is UTF-8.
+  *
+  * @param confusables a pointer to the confusable characters definitions,
+  *                    as found in file confusables.txt from unicode.org.
+  * @param confusablesLen The length of the confusables text, or -1 if the
+  *                    input string is zero terminated.
+  * @param confusablesWholeScript
+  *                    Deprecated in ICU 58.  No longer used.
+  * @param confusablesWholeScriptLen
+  *                    Deprecated in ICU 58.  No longer used.
+  * @param errType     In the event of an error in the input, indicates
+  *                    which of the input files contains the error.
+  *                    The value is one of USPOOF_SINGLE_SCRIPT_CONFUSABLE or
+  *                    USPOOF_WHOLE_SCRIPT_CONFUSABLE, or
+  *                    zero if no errors are found.
+  * @param pe          In the event of an error in the input, receives the position
+  *                    in the input text (line, offset) of the error.
+  * @param status      an in/out ICU UErrorCode.  Among the possible errors is
+  *                    U_PARSE_ERROR, which is used to report syntax errors
+  *                    in the input.
+  * @return            A spoof checker that uses the rules from the input files.
+  * @stable ICU 4.2
+  */
+U_CAPI USpoofChecker * U_EXPORT2
+uspoof_openFromSource(const char *confusables,  int32_t confusablesLen,
+                      const char *confusablesWholeScript, int32_t confusablesWholeScriptLen,
+                      int32_t *errType, UParseError *pe, UErrorCode *status);
+
+
+/**
+  * Close a Spoof Checker, freeing any memory that was being held by
+  *   its implementation.
+  * @stable ICU 4.2
+  */
+U_CAPI void U_EXPORT2
+uspoof_close(USpoofChecker *sc);
+
+/**
+ * Clone a Spoof Checker.  The clone will be set to perform the same checks
+ *   as the original source.
+ *
+ * @param sc       The source USpoofChecker
+ * @param status   The error code, set if this function encounters a problem.
+ * @return
+ * @stable ICU 4.2
+ */
+U_CAPI USpoofChecker * U_EXPORT2
+uspoof_clone(const USpoofChecker *sc, UErrorCode *status);
+
+
+/**
+ * Specify the bitmask of checks that will be performed by {@link uspoof_check}. Calling this method
+ * overwrites any checks that may have already been enabled. By default, all checks are enabled.
+ *
+ * To enable specific checks and disable all others,
+ * OR together only the bit constants for the desired checks.
+ * For example, to fail strings containing characters outside of
+ * the set specified by {@link uspoof_setAllowedChars} and
+ * also strings that contain digits from mixed numbering systems:
+ *
+ * <pre>
+ * {@code
+ * uspoof_setChecks(USPOOF_CHAR_LIMIT | USPOOF_MIXED_NUMBERS);
+ * }
+ * </pre>
+ *
+ * To disable specific checks and enable all others,
+ * start with ALL_CHECKS and "AND away" the not-desired checks.
+ * For example, if you are not planning to use the {@link uspoof_areConfusable} functionality,
+ * it is good practice to disable the CONFUSABLE check:
+ *
+ * <pre>
+ * {@code
+ * uspoof_setChecks(USPOOF_ALL_CHECKS & ~USPOOF_CONFUSABLE);
+ * }
+ * </pre>
+ *
+ * Note that methods such as {@link uspoof_setAllowedChars}, {@link uspoof_setAllowedLocales}, and
+ * {@link uspoof_setRestrictionLevel} will enable certain checks when called. Those methods will OR the check they
+ * enable onto the existing bitmask specified by this method. For more details, see the documentation of those
+ * methods.
+ *
+ * @param sc       The USpoofChecker
+ * @param checks         The set of checks that this spoof checker will perform.
+ *                 The value is a bit set, obtained by OR-ing together
+ *                 values from enum USpoofChecks.
+ * @param status   The error code, set if this function encounters a problem.
+ * @stable ICU 4.2
+ *
+ */
+U_CAPI void U_EXPORT2
+uspoof_setChecks(USpoofChecker *sc, int32_t checks, UErrorCode *status);
+
+/**
+ * Get the set of checks that this Spoof Checker has been configured to perform.
+ *
+ * @param sc       The USpoofChecker
+ * @param status   The error code, set if this function encounters a problem.
+ * @return         The set of checks that this spoof checker will perform.
+ *                 The value is a bit set, obtained by OR-ing together
+ *                 values from enum USpoofChecks.
+ * @stable ICU 4.2
+ *
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_getChecks(const USpoofChecker *sc, UErrorCode *status);
+
+/**
+ * Set the loosest restriction level allowed for strings. The default if this is not called is
+ * {@link USPOOF_HIGHLY_RESTRICTIVE}. Calling this method enables the {@link USPOOF_RESTRICTION_LEVEL} and
+ * {@link USPOOF_MIXED_NUMBERS} checks, corresponding to Sections 5.1 and 5.2 of UTS 39. To customize which checks are
+ * to be performed by {@link uspoof_check}, see {@link uspoof_setChecks}.
+ *
+ * @param sc       The USpoofChecker
+ * @param restrictionLevel The loosest restriction level allowed.
+ * @see URestrictionLevel
+ * @stable ICU 51
+ */
+U_CAPI void U_EXPORT2
+uspoof_setRestrictionLevel(USpoofChecker *sc, URestrictionLevel restrictionLevel);
+
+
+/**
+  * Get the Restriction Level that will be tested if the checks include {@link USPOOF_RESTRICTION_LEVEL}.
+  *
+  * @return The restriction level
+  * @see URestrictionLevel
+  * @stable ICU 51
+  */
+U_CAPI URestrictionLevel U_EXPORT2
+uspoof_getRestrictionLevel(const USpoofChecker *sc);
+
+/**
+ * Limit characters that are acceptable in identifiers being checked to those
+ * normally used with the languages associated with the specified locales.
+ * Any previously specified list of locales is replaced by the new settings.
+ *
+ * A set of languages is determined from the locale(s), and
+ * from those a set of acceptable Unicode scripts is determined.
+ * Characters from this set of scripts, along with characters from
+ * the "common" and "inherited" Unicode Script categories
+ * will be permitted.
+ *
+ * Supplying an empty string removes all restrictions;
+ * characters from any script will be allowed.
+ *
+ * The {@link USPOOF_CHAR_LIMIT} test is automatically enabled for this
+ * USpoofChecker when calling this function with a non-empty list
+ * of locales.
+ *
+ * The Unicode Set of characters that will be allowed is accessible
+ * via the uspoof_getAllowedChars() function.  uspoof_setAllowedLocales()
+ * will <i>replace</i> any previously applied set of allowed characters.
+ *
+ * Adjustments, such as additions or deletions of certain classes of characters,
+ * can be made to the result of uspoof_setAllowedLocales() by
+ * fetching the resulting set with uspoof_getAllowedChars(),
+ * manipulating it with the Unicode Set API, then resetting the
+ * spoof detectors limits with uspoof_setAllowedChars().
+ *
+ * @param sc           The USpoofChecker
+ * @param localesList  A list list of locales, from which the language
+ *                     and associated script are extracted.  The locales
+ *                     are comma-separated if there is more than one.
+ *                     White space may not appear within an individual locale,
+ *                     but is ignored otherwise.
+ *                     The locales are syntactically like those from the
+ *                     HTTP Accept-Language header.
+ *                     If the localesList is empty, no restrictions will be placed on
+ *                     the allowed characters.
+ *
+ * @param status       The error code, set if this function encounters a problem.
+ * @stable ICU 4.2
+ */
+U_CAPI void U_EXPORT2
+uspoof_setAllowedLocales(USpoofChecker *sc, const char *localesList, UErrorCode *status);
+
+/**
+ * Get a list of locales for the scripts that are acceptable in strings
+ *  to be checked.  If no limitations on scripts have been specified,
+ *  an empty string will be returned.
+ *
+ *  uspoof_setAllowedChars() will reset the list of allowed to be empty.
+ *
+ *  The format of the returned list is the same as that supplied to
+ *  uspoof_setAllowedLocales(), but returned list may not be identical
+ *  to the originally specified string; the string may be reformatted,
+ *  and information other than languages from
+ *  the originally specified locales may be omitted.
+ *
+ * @param sc           The USpoofChecker
+ * @param status       The error code, set if this function encounters a problem.
+ * @return             A string containing a list of  locales corresponding
+ *                     to the acceptable scripts, formatted like an
+ *                     HTTP Accept Language value.
+ *
+ * @stable ICU 4.2
+ */
+U_CAPI const char * U_EXPORT2
+uspoof_getAllowedLocales(USpoofChecker *sc, UErrorCode *status);
+
+
+/**
+ * Limit the acceptable characters to those specified by a Unicode Set.
+ *   Any previously specified character limit is
+ *   is replaced by the new settings.  This includes limits on
+ *   characters that were set with the uspoof_setAllowedLocales() function.
+ *
+ * The USPOOF_CHAR_LIMIT test is automatically enabled for this
+ * USpoofChecker by this function.
+ *
+ * @param sc       The USpoofChecker
+ * @param chars    A Unicode Set containing the list of
+ *                 characters that are permitted.  Ownership of the set
+ *                 remains with the caller.  The incoming set is cloned by
+ *                 this function, so there are no restrictions on modifying
+ *                 or deleting the USet after calling this function.
+ * @param status   The error code, set if this function encounters a problem.
+ * @stable ICU 4.2
+ */
+U_CAPI void U_EXPORT2
+uspoof_setAllowedChars(USpoofChecker *sc, const USet *chars, UErrorCode *status);
+
+
+/**
+ * Get a USet for the characters permitted in an identifier.
+ * This corresponds to the limits imposed by the Set Allowed Characters
+ * functions. Limitations imposed by other checks will not be
+ * reflected in the set returned by this function.
+ *
+ * The returned set will be frozen, meaning that it cannot be modified
+ * by the caller.
+ *
+ * Ownership of the returned set remains with the Spoof Detector.  The
+ * returned set will become invalid if the spoof detector is closed,
+ * or if a new set of allowed characters is specified.
+ *
+ *
+ * @param sc       The USpoofChecker
+ * @param status   The error code, set if this function encounters a problem.
+ * @return         A USet containing the characters that are permitted by
+ *                 the USPOOF_CHAR_LIMIT test.
+ * @stable ICU 4.2
+ */
+U_CAPI const USet * U_EXPORT2
+uspoof_getAllowedChars(const USpoofChecker *sc, UErrorCode *status);
+
+
+/**
+ * Check the specified string for possible security issues.
+ * The text to be checked will typically be an identifier of some sort.
+ * The set of checks to be performed is specified with uspoof_setChecks().
+ *
+ * \note
+ *   Consider using the newer API, {@link uspoof_check2}, instead.
+ *   The newer API exposes additional information from the check procedure
+ *   and is otherwise identical to this method.
+ *
+ * @param sc      The USpoofChecker
+ * @param id      The identifier to be checked for possible security issues,
+ *                in UTF-16 format.
+ * @param length  the length of the string to be checked, expressed in
+ *                16 bit UTF-16 code units, or -1 if the string is
+ *                zero terminated.
+ * @param position  Deprecated in ICU 51.  Always returns zero.
+ *                Originally, an out parameter for the index of the first
+ *                string position that failed a check.
+ *                This parameter may be NULL.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Spoofing or security issues detected with the input string are
+ *                not reported here, but through the function's return value.
+ * @return        An integer value with bits set for any potential security
+ *                or spoofing issues detected.  The bits are defined by
+ *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
+ *                will be zero if the input string passes all of the
+ *                enabled checks.
+ * @see uspoof_check2
+ * @stable ICU 4.2
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_check(const USpoofChecker *sc,
+                         const UChar *id, int32_t length,
+                         int32_t *position,
+                         UErrorCode *status);
+
+
+/**
+ * Check the specified string for possible security issues.
+ * The text to be checked will typically be an identifier of some sort.
+ * The set of checks to be performed is specified with uspoof_setChecks().
+ *
+ * \note
+ *   Consider using the newer API, {@link uspoof_check2UTF8}, instead.
+ *   The newer API exposes additional information from the check procedure
+ *   and is otherwise identical to this method.
+ *
+ * @param sc      The USpoofChecker
+ * @param id      A identifier to be checked for possible security issues, in UTF8 format.
+ * @param length  the length of the string to be checked, or -1 if the string is
+ *                zero terminated.
+ * @param position  Deprecated in ICU 51.  Always returns zero.
+ *                Originally, an out parameter for the index of the first
+ *                string position that failed a check.
+ *                This parameter may be NULL.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Spoofing or security issues detected with the input string are
+ *                not reported here, but through the function's return value.
+ *                If the input contains invalid UTF-8 sequences,
+ *                a status of U_INVALID_CHAR_FOUND will be returned.
+ * @return        An integer value with bits set for any potential security
+ *                or spoofing issues detected.  The bits are defined by
+ *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
+ *                will be zero if the input string passes all of the
+ *                enabled checks.
+ * @see uspoof_check2UTF8
+ * @stable ICU 4.2
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_checkUTF8(const USpoofChecker *sc,
+                 const char *id, int32_t length,
+                 int32_t *position,
+                 UErrorCode *status);
+
+
+/**
+ * Check the specified string for possible security issues.
+ * The text to be checked will typically be an identifier of some sort.
+ * The set of checks to be performed is specified with uspoof_setChecks().
+ *
+ * @param sc      The USpoofChecker
+ * @param id      The identifier to be checked for possible security issues,
+ *                in UTF-16 format.
+ * @param length  the length of the string to be checked, or -1 if the string is
+ *                zero terminated.
+ * @param checkResult  An instance of USpoofCheckResult to be filled with
+ *                details about the identifier.  Can be NULL.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Spoofing or security issues detected with the input string are
+ *                not reported here, but through the function's return value.
+ * @return        An integer value with bits set for any potential security
+ *                or spoofing issues detected.  The bits are defined by
+ *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
+ *                will be zero if the input string passes all of the
+ *                enabled checks.  Any information in this bitmask will be
+ *                consistent with the information saved in the optional
+ *                checkResult parameter.
+ * @see uspoof_openCheckResult
+ * @see uspoof_check2UTF8
+ * @see uspoof_check2UnicodeString
+ * @stable ICU 58
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_check2(const USpoofChecker *sc,
+    const UChar* id, int32_t length,
+    USpoofCheckResult* checkResult,
+    UErrorCode *status);
+
+/**
+ * Check the specified string for possible security issues.
+ * The text to be checked will typically be an identifier of some sort.
+ * The set of checks to be performed is specified with uspoof_setChecks().
+ *
+ * This version of {@link uspoof_check} accepts a USpoofCheckResult, which
+ * returns additional information about the identifier.  For more
+ * information, see {@link uspoof_openCheckResult}.
+ *
+ * @param sc      The USpoofChecker
+ * @param id      A identifier to be checked for possible security issues, in UTF8 format.
+ * @param length  the length of the string to be checked, or -1 if the string is
+ *                zero terminated.
+ * @param checkResult  An instance of USpoofCheckResult to be filled with
+ *                details about the identifier.  Can be NULL.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Spoofing or security issues detected with the input string are
+ *                not reported here, but through the function's return value.
+ * @return        An integer value with bits set for any potential security
+ *                or spoofing issues detected.  The bits are defined by
+ *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
+ *                will be zero if the input string passes all of the
+ *                enabled checks.  Any information in this bitmask will be
+ *                consistent with the information saved in the optional
+ *                checkResult parameter.
+ * @see uspoof_openCheckResult
+ * @see uspoof_check2
+ * @see uspoof_check2UnicodeString
+ * @stable ICU 58
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_check2UTF8(const USpoofChecker *sc,
+    const char *id, int32_t length,
+    USpoofCheckResult* checkResult,
+    UErrorCode *status);
+
+/**
+ * Create a USpoofCheckResult, used by the {@link uspoof_check2} class of functions to return
+ * information about the identifier.  Information includes:
+ * <ul>
+ *   <li>A bitmask of the checks that failed</li>
+ *   <li>The identifier's restriction level (UTS 39 section 5.2)</li>
+ *   <li>The set of numerics in the string (UTS 39 section 5.3)</li>
+ * </ul>
+ * The data held in a USpoofCheckResult is cleared whenever it is passed into a new call
+ * of {@link uspoof_check2}.
+ *
+ * @param status  The error code, set if this function encounters a problem.
+ * @return        the newly created USpoofCheckResult
+ * @see uspoof_check2
+ * @see uspoof_check2UTF8
+ * @see uspoof_check2UnicodeString
+ * @stable ICU 58
+ */
+U_CAPI USpoofCheckResult* U_EXPORT2
+uspoof_openCheckResult(UErrorCode *status);
+
+/**
+ * Close a USpoofCheckResult, freeing any memory that was being held by
+ *   its implementation.
+ *
+ * @param checkResult  The instance of USpoofCheckResult to close
+ * @stable ICU 58
+ */
+U_CAPI void U_EXPORT2
+uspoof_closeCheckResult(USpoofCheckResult *checkResult);
+
+/**
+ * Indicates which of the spoof check(s) have failed. The value is a bitwise OR of the constants for the tests
+ * in question: USPOOF_RESTRICTION_LEVEL, USPOOF_CHAR_LIMIT, and so on.
+ *
+ * @param checkResult  The instance of USpoofCheckResult created by {@link uspoof_openCheckResult}
+ * @param status       The error code, set if an error occurred.
+ * @return        An integer value with bits set for any potential security
+ *                or spoofing issues detected.  The bits are defined by
+ *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
+ *                will be zero if the input string passes all of the
+ *                enabled checks.
+ * @see uspoof_setChecks
+ * @stable ICU 58
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_getCheckResultChecks(const USpoofCheckResult *checkResult, UErrorCode *status);
+
+/**
+ * Gets the restriction level that the text meets, if the USPOOF_RESTRICTION_LEVEL check
+ * was enabled; otherwise, undefined.
+ *
+ * @param checkResult  The instance of USpoofCheckResult created by {@link uspoof_openCheckResult}
+ * @param status       The error code, set if an error occurred.
+ * @return             The restriction level contained in the USpoofCheckResult
+ * @see uspoof_setRestrictionLevel
+ * @stable ICU 58
+ */
+U_CAPI URestrictionLevel U_EXPORT2
+uspoof_getCheckResultRestrictionLevel(const USpoofCheckResult *checkResult, UErrorCode *status);
+
+/**
+ * Gets the set of numerics found in the string, if the USPOOF_MIXED_NUMBERS check was enabled;
+ * otherwise, undefined.  The set will contain the zero digit from each decimal number system found
+ * in the input string.  Ownership of the returned USet remains with the USpoofCheckResult.
+ * The USet will be free'd when {@link uspoof_closeCheckResult} is called.
+ *
+ * @param checkResult  The instance of USpoofCheckResult created by {@link uspoof_openCheckResult}
+ * @return             The set of numerics contained in the USpoofCheckResult
+ * @param status       The error code, set if an error occurred.
+ * @stable ICU 58
+ */
+U_CAPI const USet* U_EXPORT2
+uspoof_getCheckResultNumerics(const USpoofCheckResult *checkResult, UErrorCode *status);
+
+
+/**
+ * Check the whether two specified strings are visually confusable.
+ *
+ * If the strings are confusable, the return value will be nonzero, as long as
+ * {@link USPOOF_CONFUSABLE} was enabled in uspoof_setChecks().
+ *
+ * The bits in the return value correspond to flags for each of the classes of
+ * confusables applicable to the two input strings.  According to UTS 39
+ * section 4, the possible flags are:
+ *
+ * <ul>
+ *   <li>{@link USPOOF_SINGLE_SCRIPT_CONFUSABLE}</li>
+ *   <li>{@link USPOOF_MIXED_SCRIPT_CONFUSABLE}</li>
+ *   <li>{@link USPOOF_WHOLE_SCRIPT_CONFUSABLE}</li>
+ * </ul>
+ *
+ * If one or more of the above flags were not listed in uspoof_setChecks(), this
+ * function will never report that class of confusable.  The check
+ * {@link USPOOF_CONFUSABLE} enables all three flags.
+ *
+ *
+ * @param sc      The USpoofChecker
+ * @param id1     The first of the two identifiers to be compared for
+ *                confusability.  The strings are in UTF-16 format.
+ * @param length1 the length of the first identifier, expressed in
+ *                16 bit UTF-16 code units, or -1 if the string is
+ *                nul terminated.
+ * @param id2     The second of the two identifiers to be compared for
+ *                confusability.  The identifiers are in UTF-16 format.
+ * @param length2 The length of the second identifiers, expressed in
+ *                16 bit UTF-16 code units, or -1 if the string is
+ *                nul terminated.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Confusability of the identifiers is not reported here,
+ *                but through this function's return value.
+ * @return        An integer value with bit(s) set corresponding to
+ *                the type of confusability found, as defined by
+ *                enum USpoofChecks.  Zero is returned if the identifiers
+ *                are not confusable.
+ *
+ * @stable ICU 4.2
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_areConfusable(const USpoofChecker *sc,
+                     const UChar *id1, int32_t length1,
+                     const UChar *id2, int32_t length2,
+                     UErrorCode *status);
+
+
+
+/**
+ * A version of {@link uspoof_areConfusable} accepting strings in UTF-8 format.
+ *
+ * @param sc      The USpoofChecker
+ * @param id1     The first of the two identifiers to be compared for
+ *                confusability.  The strings are in UTF-8 format.
+ * @param length1 the length of the first identifiers, in bytes, or -1
+ *                if the string is nul terminated.
+ * @param id2     The second of the two identifiers to be compared for
+ *                confusability.  The strings are in UTF-8 format.
+ * @param length2 The length of the second string in bytes, or -1
+ *                if the string is nul terminated.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Confusability of the strings is not reported here,
+ *                but through this function's return value.
+ * @return        An integer value with bit(s) set corresponding to
+ *                the type of confusability found, as defined by
+ *                enum USpoofChecks.  Zero is returned if the strings
+ *                are not confusable.
+ *
+ * @stable ICU 4.2
+ *
+ * @see uspoof_areConfusable
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_areConfusableUTF8(const USpoofChecker *sc,
+                         const char *id1, int32_t length1,
+                         const char *id2, int32_t length2,
+                         UErrorCode *status);
+
+
+
+
+/**
+ *  Get the "skeleton" for an identifier.
+ *  Skeletons are a transformation of the input identifier;
+ * Two identifiers are confusable if their skeletons are identical.
+ *  See Unicode UAX #39 for additional information.
+ *
+ *  Using skeletons directly makes it possible to quickly check
+ *  whether an identifier is confusable with any of some large
+ *  set of existing identifiers, by creating an efficiently
+ *  searchable collection of the skeletons.
+ *
+ * @param sc      The USpoofChecker
+ * @param type    Deprecated in ICU 58.  You may pass any number.
+ *                Originally, controlled which of the Unicode confusable data
+ *                tables to use.
+ * @param id      The input identifier whose skeleton will be computed.
+ * @param length  The length of the input identifier, expressed in 16 bit
+ *                UTF-16 code units, or -1 if the string is zero terminated.
+ * @param dest    The output buffer, to receive the skeleton string.
+ * @param destCapacity  The length of the output buffer, in 16 bit units.
+ *                The destCapacity may be zero, in which case the function will
+ *                return the actual length of the skeleton.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ * @return        The length of the skeleton string.  The returned length
+ *                is always that of the complete skeleton, even when the
+ *                supplied buffer is too small (or of zero length)
+ *
+ * @stable ICU 4.2
+ * @see uspoof_areConfusable
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_getSkeleton(const USpoofChecker *sc,
+                   uint32_t type,
+                   const UChar *id,  int32_t length,
+                   UChar *dest, int32_t destCapacity,
+                   UErrorCode *status);
+
+/**
+ *  Get the "skeleton" for an identifier.
+ *  Skeletons are a transformation of the input identifier;
+ *  Two identifiers are confusable if their skeletons are identical.
+ *  See Unicode UAX #39 for additional information.
+ *
+ *  Using skeletons directly makes it possible to quickly check
+ *  whether an identifier is confusable with any of some large
+ *  set of existing identifiers, by creating an efficiently
+ *  searchable collection of the skeletons.
+ *
+ * @param sc      The USpoofChecker
+ * @param type    Deprecated in ICU 58.  You may pass any number.
+ *                Originally, controlled which of the Unicode confusable data
+ *                tables to use.
+ * @param id      The UTF-8 format identifier whose skeleton will be computed.
+ * @param length  The length of the input string, in bytes,
+ *                or -1 if the string is zero terminated.
+ * @param dest    The output buffer, to receive the skeleton string.
+ * @param destCapacity  The length of the output buffer, in bytes.
+ *                The destCapacity may be zero, in which case the function will
+ *                return the actual length of the skeleton.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.  Possible Errors include U_INVALID_CHAR_FOUND
+ *                   for invalid UTF-8 sequences, and
+ *                   U_BUFFER_OVERFLOW_ERROR if the destination buffer is too small
+ *                   to hold the complete skeleton.
+ * @return        The length of the skeleton string, in bytes.  The returned length
+ *                is always that of the complete skeleton, even when the
+ *                supplied buffer is too small (or of zero length)
+ *
+ * @stable ICU 4.2
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_getSkeletonUTF8(const USpoofChecker *sc,
+                       uint32_t type,
+                       const char *id,  int32_t length,
+                       char *dest, int32_t destCapacity,
+                       UErrorCode *status);
+
+/**
+  * Get the set of Candidate Characters for Inclusion in Identifiers, as defined
+  * in http://unicode.org/Public/security/latest/xidmodifications.txt
+  * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms.
+  *
+  * The returned set is frozen. Ownership of the set remains with the ICU library; it must not
+  * be deleted by the caller.
+  *
+  * @param status The error code, set if a problem occurs while creating the set.
+  *
+  * @stable ICU 51
+  */
+U_CAPI const USet * U_EXPORT2
+uspoof_getInclusionSet(UErrorCode *status);
+
+/**
+  * Get the set of characters from Recommended Scripts for Inclusion in Identifiers, as defined
+  * in http://unicode.org/Public/security/latest/xidmodifications.txt
+  * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms.
+  *
+  * The returned set is frozen. Ownership of the set remains with the ICU library; it must not
+  * be deleted by the caller.
+  *
+  * @param status The error code, set if a problem occurs while creating the set.
+  *
+  * @stable ICU 51
+  */
+U_CAPI const USet * U_EXPORT2
+uspoof_getRecommendedSet(UErrorCode *status);
+
+/**
+ * Serialize the data for a spoof detector into a chunk of memory.
+ * The flattened spoof detection tables can later be used to efficiently
+ * instantiate a new Spoof Detector.
+ *
+ * The serialized spoof checker includes only the data compiled from the
+ * Unicode data tables by uspoof_openFromSource(); it does not include
+ * include any other state or configuration that may have been set.
+ *
+ * @param sc   the Spoof Detector whose data is to be serialized.
+ * @param data a pointer to 32-bit-aligned memory to be filled with the data,
+ *             can be NULL if capacity==0
+ * @param capacity the number of bytes available at data,
+ *                 or 0 for preflighting
+ * @param status an in/out ICU UErrorCode; possible errors include:
+ * - U_BUFFER_OVERFLOW_ERROR if the data storage block is too small for serialization
+ * - U_ILLEGAL_ARGUMENT_ERROR  the data or capacity parameters are bad
+ * @return the number of bytes written or needed for the spoof data
+ *
+ * @see utrie2_openFromSerialized()
+ * @stable ICU 4.2
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_serialize(USpoofChecker *sc,
+                 void *data, int32_t capacity,
+                 UErrorCode *status);
+
+U_CDECL_END
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * \class LocalUSpoofCheckerPointer
+ * "Smart pointer" class, closes a USpoofChecker via uspoof_close().
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @stable ICU 4.4
+ */
+/**
+ * \cond
+ * Note: Doxygen is giving a bogus warning on this U_DEFINE_LOCAL_OPEN_POINTER.
+ *       For now, suppress with a Doxygen cond
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalUSpoofCheckerPointer, USpoofChecker, uspoof_close);
+/** \endcond */
+
+/**
+ * \class LocalUSpoofCheckResultPointer
+ * "Smart pointer" class, closes a USpoofCheckResult via `uspoof_closeCheckResult()`.
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @stable ICU 58
+ */
+
+/**
+ * \cond
+ * Note: Doxygen is giving a bogus warning on this U_DEFINE_LOCAL_OPEN_POINTER.
+ *       For now, suppress with a Doxygen cond
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalUSpoofCheckResultPointer, USpoofCheckResult, uspoof_closeCheckResult);
+/** \endcond */
+
+U_NAMESPACE_END
+
+/**
+ * Limit the acceptable characters to those specified by a Unicode Set.
+ *   Any previously specified character limit is
+ *   is replaced by the new settings.    This includes limits on
+ *   characters that were set with the uspoof_setAllowedLocales() function.
+ *
+ * The USPOOF_CHAR_LIMIT test is automatically enabled for this
+ * USoofChecker by this function.
+ *
+ * @param sc       The USpoofChecker
+ * @param chars    A Unicode Set containing the list of
+ *                 characters that are permitted.  Ownership of the set
+ *                 remains with the caller.  The incoming set is cloned by
+ *                 this function, so there are no restrictions on modifying
+ *                 or deleting the UnicodeSet after calling this function.
+ * @param status   The error code, set if this function encounters a problem.
+ * @stable ICU 4.2
+ */
+U_CAPI void U_EXPORT2
+uspoof_setAllowedUnicodeSet(USpoofChecker *sc, const icu::UnicodeSet *chars, UErrorCode *status);
+
+
+/**
+ * Get a UnicodeSet for the characters permitted in an identifier.
+ * This corresponds to the limits imposed by the Set Allowed Characters /
+ * UnicodeSet functions. Limitations imposed by other checks will not be
+ * reflected in the set returned by this function.
+ *
+ * The returned set will be frozen, meaning that it cannot be modified
+ * by the caller.
+ *
+ * Ownership of the returned set remains with the Spoof Detector.  The
+ * returned set will become invalid if the spoof detector is closed,
+ * or if a new set of allowed characters is specified.
+ *
+ *
+ * @param sc       The USpoofChecker
+ * @param status   The error code, set if this function encounters a problem.
+ * @return         A UnicodeSet containing the characters that are permitted by
+ *                 the USPOOF_CHAR_LIMIT test.
+ * @stable ICU 4.2
+ */
+U_CAPI const icu::UnicodeSet * U_EXPORT2
+uspoof_getAllowedUnicodeSet(const USpoofChecker *sc, UErrorCode *status);
+
+/**
+ * Check the specified string for possible security issues.
+ * The text to be checked will typically be an identifier of some sort.
+ * The set of checks to be performed is specified with uspoof_setChecks().
+ *
+ * \note
+ *   Consider using the newer API, {@link uspoof_check2UnicodeString}, instead.
+ *   The newer API exposes additional information from the check procedure
+ *   and is otherwise identical to this method.
+ *
+ * @param sc      The USpoofChecker
+ * @param id      A identifier to be checked for possible security issues.
+ * @param position  Deprecated in ICU 51.  Always returns zero.
+ *                Originally, an out parameter for the index of the first
+ *                string position that failed a check.
+ *                This parameter may be NULL.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Spoofing or security issues detected with the input string are
+ *                not reported here, but through the function's return value.
+ * @return        An integer value with bits set for any potential security
+ *                or spoofing issues detected.  The bits are defined by
+ *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
+ *                will be zero if the input string passes all of the
+ *                enabled checks.
+ * @see uspoof_check2UnicodeString
+ * @stable ICU 4.2
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_checkUnicodeString(const USpoofChecker *sc,
+                          const icu::UnicodeString &id,
+                          int32_t *position,
+                          UErrorCode *status);
+
+/**
+ * Check the specified string for possible security issues.
+ * The text to be checked will typically be an identifier of some sort.
+ * The set of checks to be performed is specified with uspoof_setChecks().
+ *
+ * @param sc      The USpoofChecker
+ * @param id      A identifier to be checked for possible security issues.
+ * @param checkResult  An instance of USpoofCheckResult to be filled with
+ *                details about the identifier.  Can be NULL.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Spoofing or security issues detected with the input string are
+ *                not reported here, but through the function's return value.
+ * @return        An integer value with bits set for any potential security
+ *                or spoofing issues detected.  The bits are defined by
+ *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
+ *                will be zero if the input string passes all of the
+ *                enabled checks.  Any information in this bitmask will be
+ *                consistent with the information saved in the optional
+ *                checkResult parameter.
+ * @see uspoof_openCheckResult
+ * @see uspoof_check2
+ * @see uspoof_check2UTF8
+ * @stable ICU 58
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_check2UnicodeString(const USpoofChecker *sc,
+    const icu::UnicodeString &id,
+    USpoofCheckResult* checkResult,
+    UErrorCode *status);
+
+/**
+ * A version of {@link uspoof_areConfusable} accepting UnicodeStrings.
+ *
+ * @param sc      The USpoofChecker
+ * @param s1     The first of the two identifiers to be compared for
+ *                confusability.  The strings are in UTF-8 format.
+ * @param s2     The second of the two identifiers to be compared for
+ *                confusability.  The strings are in UTF-8 format.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ *                Confusability of the identifiers is not reported here,
+ *                but through this function's return value.
+ * @return        An integer value with bit(s) set corresponding to
+ *                the type of confusability found, as defined by
+ *                enum USpoofChecks.  Zero is returned if the identifiers
+ *                are not confusable.
+ *
+ * @stable ICU 4.2
+ *
+ * @see uspoof_areConfusable
+ */
+U_CAPI int32_t U_EXPORT2
+uspoof_areConfusableUnicodeString(const USpoofChecker *sc,
+                                  const icu::UnicodeString &s1,
+                                  const icu::UnicodeString &s2,
+                                  UErrorCode *status);
+
+/**
+ *  Get the "skeleton" for an identifier.
+ *  Skeletons are a transformation of the input identifier;
+ *  Two identifiers are confusable if their skeletons are identical.
+ *  See Unicode UAX #39 for additional information.
+ *
+ *  Using skeletons directly makes it possible to quickly check
+ *  whether an identifier is confusable with any of some large
+ *  set of existing identifiers, by creating an efficiently
+ *  searchable collection of the skeletons.
+ *
+ * @param sc      The USpoofChecker.
+ * @param type    Deprecated in ICU 58.  You may pass any number.
+ *                Originally, controlled which of the Unicode confusable data
+ *                tables to use.
+ * @param id      The input identifier whose skeleton will be computed.
+ * @param dest    The output identifier, to receive the skeleton string.
+ * @param status  The error code, set if an error occurred while attempting to
+ *                perform the check.
+ * @return        A reference to the destination (skeleton) string.
+ *
+ * @stable ICU 4.2
+ */
+U_I18N_API icu::UnicodeString & U_EXPORT2
+uspoof_getSkeletonUnicodeString(const USpoofChecker *sc,
+                                uint32_t type,
+                                const icu::UnicodeString &id,
+                                icu::UnicodeString &dest,
+                                UErrorCode *status);
+
+/**
+  * Get the set of Candidate Characters for Inclusion in Identifiers, as defined
+  * in http://unicode.org/Public/security/latest/xidmodifications.txt
+  * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms.
+  *
+  * The returned set is frozen. Ownership of the set remains with the ICU library; it must not
+  * be deleted by the caller.
+  *
+  * @param status The error code, set if a problem occurs while creating the set.
+  *
+  * @stable ICU 51
+  */
+U_CAPI const icu::UnicodeSet * U_EXPORT2
+uspoof_getInclusionUnicodeSet(UErrorCode *status);
+
+/**
+  * Get the set of characters from Recommended Scripts for Inclusion in Identifiers, as defined
+  * in http://unicode.org/Public/security/latest/xidmodifications.txt
+  * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms.
+  *
+  * The returned set is frozen. Ownership of the set remains with the ICU library; it must not
+  * be deleted by the caller.
+  *
+  * @param status The error code, set if a problem occurs while creating the set.
+  *
+  * @stable ICU 51
+  */
+U_CAPI const icu::UnicodeSet * U_EXPORT2
+uspoof_getRecommendedUnicodeSet(UErrorCode *status);
+
+#endif /* U_SHOW_CPLUSPLUS_API */
+
+#endif /* UCONFIG_NO_NORMALIZATION */
+
+#endif   /* USPOOF_H */
diff --git a/thirdparty/icu4c/i18n/uspoof.cpp b/thirdparty/icu4c/i18n/uspoof.cpp
new file mode 100644
index 0000000000..dd4618baa7
--- /dev/null
+++ b/thirdparty/icu4c/i18n/uspoof.cpp
@@ -0,0 +1,839 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+***************************************************************************
+* Copyright (C) 2008-2015, International Business Machines Corporation
+* and others. All Rights Reserved.
+***************************************************************************
+*   file name:  uspoof.cpp
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2008Feb13
+*   created by: Andy Heninger
+*
+*   Unicode Spoof Detection
+*/
+#include "unicode/utypes.h"
+#include "unicode/normalizer2.h"
+#include "unicode/uspoof.h"
+#include "unicode/ustring.h"
+#include "unicode/utf16.h"
+#include "cmemory.h"
+#include "cstring.h"
+#include "mutex.h"
+#include "scriptset.h"
+#include "uassert.h"
+#include "ucln_in.h"
+#include "uspoof_impl.h"
+#include "umutex.h"
+
+
+#if !UCONFIG_NO_NORMALIZATION
+
+U_NAMESPACE_USE
+
+
+//
+// Static Objects used by the spoof impl, their thread safe initialization and their cleanup.
+//
+static UnicodeSet *gInclusionSet = NULL;
+static UnicodeSet *gRecommendedSet = NULL;
+static const Normalizer2 *gNfdNormalizer = NULL;
+static UInitOnce gSpoofInitStaticsOnce = U_INITONCE_INITIALIZER;
+
+namespace {
+
+UBool U_CALLCONV
+uspoof_cleanup(void) {
+    delete gInclusionSet;
+    gInclusionSet = NULL;
+    delete gRecommendedSet;
+    gRecommendedSet = NULL;
+    gNfdNormalizer = NULL;
+    gSpoofInitStaticsOnce.reset();
+    return TRUE;
+}
+
+void U_CALLCONV initializeStatics(UErrorCode &status) {
+    static const char16_t *inclusionPat =
+        u"['\\-.\\:\\u00B7\\u0375\\u058A\\u05F3\\u05F4\\u06FD\\u06FE\\u0F0B\\u200C"
+        u"\\u200D\\u2010\\u2019\\u2027\\u30A0\\u30FB]";
+    gInclusionSet = new UnicodeSet(UnicodeString(inclusionPat), status);
+    if (gInclusionSet == NULL) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+        return;
+    }
+    gInclusionSet->freeze();
+
+    // Note: data from IdentifierStatus.txt & IdentifierType.txt
+    // There is tooling to generate this constant in the unicodetools project:
+    //      org.unicode.text.tools.RecommendedSetGenerator
+    // It will print the Java and C++ code to the console for easy copy-paste into this file.
+    static const char16_t *recommendedPat =
+        u"[0-9A-Z_a-z\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u0131\\u0134-\\u013E"
+        u"\\u0141-\\u0148\\u014A-\\u017E\\u018F\\u01A0\\u01A1\\u01AF\\u01B0\\u01CD-"
+        u"\\u01DC\\u01DE-\\u01E3\\u01E6-\\u01F0\\u01F4\\u01F5\\u01F8-\\u021B\\u021E"
+        u"\\u021F\\u0226-\\u0233\\u0259\\u02BB\\u02BC\\u02EC\\u0300-\\u0304\\u0306-"
+        u"\\u030C\\u030F-\\u0311\\u0313\\u0314\\u031B\\u0323-\\u0328\\u032D\\u032E"
+        u"\\u0330\\u0331\\u0335\\u0338\\u0339\\u0342\\u0345\\u037B-\\u037D\\u0386"
+        u"\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03CE\\u03FC-\\u045F\\u048A-"
+        u"\\u04FF\\u0510-\\u0529\\u052E\\u052F\\u0531-\\u0556\\u0559\\u0561-\\u0586"
+        u"\\u05B4\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0620-\\u063F\\u0641-\\u0655\\u0660-"
+        u"\\u0669\\u0670-\\u0672\\u0674\\u0679-\\u068D\\u068F-\\u06A0\\u06A2-\\u06D3"
+        u"\\u06D5\\u06E5\\u06E6\\u06EE-\\u06FC\\u06FF\\u0750-\\u07B1\\u0870-\\u0887"
+        u"\\u0889-\\u088E\\u08A0-\\u08AC\\u08B2\\u08B5-\\u08C9\\u0901-\\u094D\\u094F"
+        u"\\u0950\\u0956\\u0957\\u0960-\\u0963\\u0966-\\u096F\\u0971-\\u0977\\u0979-"
+        u"\\u097F\\u0981-\\u0983\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-"
+        u"\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BC-\\u09C4\\u09C7\\u09C8\\u09CB-\\u09CE"
+        u"\\u09D7\\u09E0-\\u09E3\\u09E6-\\u09F1\\u09FE\\u0A01-\\u0A03\\u0A05-\\u0A0A"
+        u"\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A35\\u0A38\\u0A39"
+        u"\\u0A3C\\u0A3E-\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A5C\\u0A66-\\u0A74"
+        u"\\u0A81-\\u0A83\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0"
+        u"\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABC-\\u0AC5\\u0AC7-\\u0AC9\\u0ACB-\\u0ACD"
+        u"\\u0AD0\\u0AE0-\\u0AE3\\u0AE6-\\u0AEF\\u0AFA-\\u0AFF\\u0B01-\\u0B03\\u0B05-"
+        u"\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-"
+        u"\\u0B39\\u0B3C-\\u0B43\\u0B47\\u0B48\\u0B4B-\\u0B4D\\u0B55-\\u0B57\\u0B5F-"
+        u"\\u0B61\\u0B66-\\u0B6F\\u0B71\\u0B82\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90"
+        u"\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-"
+        u"\\u0BAA\\u0BAE-\\u0BB9\\u0BBE-\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCD\\u0BD0"
+        u"\\u0BD7\\u0BE6-\\u0BEF\\u0C01-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-"
+        u"\\u0C33\\u0C35-\\u0C39\\u0C3C-\\u0C44\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55"
+        u"\\u0C56\\u0C5D\\u0C60\\u0C61\\u0C66-\\u0C6F\\u0C80\\u0C82\\u0C83\\u0C85-"
+        u"\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBC-"
+        u"\\u0CC4\\u0CC6-\\u0CC8\\u0CCA-\\u0CCD\\u0CD5\\u0CD6\\u0CDD\\u0CE0-\\u0CE3"
+        u"\\u0CE6-\\u0CEF\\u0CF1\\u0CF2\\u0D00\\u0D02\\u0D03\\u0D05-\\u0D0C\\u0D0E-"
+        u"\\u0D10\\u0D12-\\u0D3A\\u0D3D-\\u0D43\\u0D46-\\u0D48\\u0D4A-\\u0D4E\\u0D54-"
+        u"\\u0D57\\u0D60\\u0D61\\u0D66-\\u0D6F\\u0D7A-\\u0D7F\\u0D82\\u0D83\\u0D85-"
+        u"\\u0D8E\\u0D91-\\u0D96\\u0D9A-\\u0DA5\\u0DA7-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD"
+        u"\\u0DC0-\\u0DC6\\u0DCA\\u0DCF-\\u0DD4\\u0DD6\\u0DD8-\\u0DDE\\u0DF2\\u0E01-"
+        u"\\u0E32\\u0E34-\\u0E3A\\u0E40-\\u0E4E\\u0E50-\\u0E59\\u0E81\\u0E82\\u0E84"
+        u"\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EB2\\u0EB4-\\u0EBD\\u0EC0-"
+        u"\\u0EC4\\u0EC6\\u0EC8-\\u0ECD\\u0ED0-\\u0ED9\\u0EDE\\u0EDF\\u0F00\\u0F20-"
+        u"\\u0F29\\u0F35\\u0F37\\u0F3E-\\u0F42\\u0F44-\\u0F47\\u0F49-\\u0F4C\\u0F4E-"
+        u"\\u0F51\\u0F53-\\u0F56\\u0F58-\\u0F5B\\u0F5D-\\u0F68\\u0F6A-\\u0F6C\\u0F71"
+        u"\\u0F72\\u0F74\\u0F7A-\\u0F80\\u0F82-\\u0F84\\u0F86-\\u0F92\\u0F94-\\u0F97"
+        u"\\u0F99-\\u0F9C\\u0F9E-\\u0FA1\\u0FA3-\\u0FA6\\u0FA8-\\u0FAB\\u0FAD-\\u0FB8"
+        u"\\u0FBA-\\u0FBC\\u0FC6\\u1000-\\u1049\\u1050-\\u109D\\u10C7\\u10CD\\u10D0-"
+        u"\\u10F0\\u10F7-\\u10FA\\u10FD-\\u10FF\\u1200-\\u1248\\u124A-\\u124D\\u1250-"
+        u"\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0"
+        u"\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-"
+        u"\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u135D-\\u135F\\u1380-\\u138F\\u1780-"
+        u"\\u17A2\\u17A5-\\u17A7\\u17A9-\\u17B3\\u17B6-\\u17CD\\u17D0\\u17D2\\u17D7"
+        u"\\u17DC\\u17E0-\\u17E9\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1E00-\\u1E99\\u1E9E"
+        u"\\u1EA0-\\u1EF9\\u1F00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D"
+        u"\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F70\\u1F72\\u1F74\\u1F76"
+        u"\\u1F78\\u1F7A\\u1F7C\\u1F80-\\u1FB4\\u1FB6-\\u1FBA\\u1FBC\\u1FC2-\\u1FC4"
+        u"\\u1FC6-\\u1FC8\\u1FCA\\u1FCC\\u1FD0-\\u1FD2\\u1FD6-\\u1FDA\\u1FE0-\\u1FE2"
+        u"\\u1FE4-\\u1FEA\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FF8\\u1FFA\\u1FFC\\u2D27"
+        u"\\u2D2D\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-"
+        u"\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u3005-"
+        u"\\u3007\\u3041-\\u3096\\u3099\\u309A\\u309D\\u309E\\u30A1-\\u30FA\\u30FC-"
+        u"\\u30FE\\u3105-\\u312D\\u312F\\u31A0-\\u31BF\\u3400-\\u4DBF\\u4E00-\\u9FFF"
+        u"\\uA67F\\uA717-\\uA71F\\uA788\\uA78D\\uA792\\uA793\\uA7AA\\uA7AE\\uA7B8"
+        u"\\uA7B9\\uA7C0-\\uA7CA\\uA7D0\\uA7D1\\uA7D3\\uA7D5-\\uA7D9\\uA9E7-\\uA9FE"
+        u"\\uAA60-\\uAA76\\uAA7A-\\uAA7F\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16"
+        u"\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB66\\uAB67\\uAC00-\\uD7A3\\uFA0E\\uFA0F"
+        u"\\uFA11\\uFA13\\uFA14\\uFA1F\\uFA21\\uFA23\\uFA24\\uFA27-\\uFA29\\U00011301"
+        u"\\U00011303\\U0001133B\\U0001133C\\U00016FF0\\U00016FF1\\U0001B11F-"
+        u"\\U0001B122\\U0001B150-\\U0001B152\\U0001B164-\\U0001B167\\U0001DF00-"
+        u"\\U0001DF1E\\U0001E7E0-\\U0001E7E6\\U0001E7E8-\\U0001E7EB\\U0001E7ED"
+        u"\\U0001E7EE\\U0001E7F0-\\U0001E7FE\\U00020000-\\U0002A6DF\\U0002A700-"
+        u"\\U0002B738\\U0002B740-\\U0002B81D\\U0002B820-\\U0002CEA1\\U0002CEB0-"
+        u"\\U0002EBE0\\U00030000-\\U0003134A]";
+
+    gRecommendedSet = new UnicodeSet(UnicodeString(recommendedPat), status);
+    if (gRecommendedSet == NULL) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+        delete gInclusionSet;
+        return;
+    }
+    gRecommendedSet->freeze();
+    gNfdNormalizer = Normalizer2::getNFDInstance(status);
+    ucln_i18n_registerCleanup(UCLN_I18N_SPOOF, uspoof_cleanup);
+}
+
+}  // namespace
+
+U_CFUNC void uspoof_internalInitStatics(UErrorCode *status) {
+    umtx_initOnce(gSpoofInitStaticsOnce, &initializeStatics, *status);
+}
+
+U_CAPI USpoofChecker * U_EXPORT2
+uspoof_open(UErrorCode *status) {
+    umtx_initOnce(gSpoofInitStaticsOnce, &initializeStatics, *status);
+    if (U_FAILURE(*status)) {
+        return NULL;
+    }
+    SpoofImpl *si = new SpoofImpl(*status);
+    if (si == NULL) {
+        *status = U_MEMORY_ALLOCATION_ERROR;
+        return NULL;
+    }
+    if (U_FAILURE(*status)) {
+        delete si;
+        return NULL;
+    }
+    return si->asUSpoofChecker();
+}
+
+
+U_CAPI USpoofChecker * U_EXPORT2
+uspoof_openFromSerialized(const void *data, int32_t length, int32_t *pActualLength,
+                          UErrorCode *status) {
+    if (U_FAILURE(*status)) {
+        return NULL;
+    }
+
+    if (data == NULL) {
+        *status = U_ILLEGAL_ARGUMENT_ERROR;
+        return NULL;
+    }
+
+    umtx_initOnce(gSpoofInitStaticsOnce, &initializeStatics, *status);
+    if (U_FAILURE(*status))
+    {
+        return NULL;
+    }
+
+    SpoofData *sd = new SpoofData(data, length, *status);
+    if (sd == NULL) {
+        *status = U_MEMORY_ALLOCATION_ERROR;
+        return NULL;
+    }
+
+    if (U_FAILURE(*status)) {
+        delete sd;
+        return NULL;
+    }
+
+    SpoofImpl *si = new SpoofImpl(sd, *status);
+    if (si == NULL) {
+        *status = U_MEMORY_ALLOCATION_ERROR;
+        delete sd; // explicit delete as the destructor for si won't be called.
+        return NULL;
+    }
+
+    if (U_FAILURE(*status)) {
+        delete si; // no delete for sd, as the si destructor will delete it.
+        return NULL;
+    }
+
+    if (pActualLength != NULL) {
+        *pActualLength = sd->size();
+    }
+    return si->asUSpoofChecker();
+}
+
+
+U_CAPI USpoofChecker * U_EXPORT2
+uspoof_clone(const USpoofChecker *sc, UErrorCode *status) {
+    const SpoofImpl *src = SpoofImpl::validateThis(sc, *status);
+    if (src == NULL) {
+        return NULL;
+    }
+    SpoofImpl *result = new SpoofImpl(*src, *status);   // copy constructor
+    if (result == NULL) {
+        *status = U_MEMORY_ALLOCATION_ERROR;
+        return NULL;
+    }
+    if (U_FAILURE(*status)) {
+        delete result;
+        result = NULL;
+    }
+    return result->asUSpoofChecker();
+}
+
+
+U_CAPI void U_EXPORT2
+uspoof_close(USpoofChecker *sc) {
+    UErrorCode status = U_ZERO_ERROR;
+    SpoofImpl *This = SpoofImpl::validateThis(sc, status);
+    delete This;
+}
+
+
+U_CAPI void U_EXPORT2
+uspoof_setChecks(USpoofChecker *sc, int32_t checks, UErrorCode *status) {
+    SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        return;
+    }
+
+    // Verify that the requested checks are all ones (bits) that 
+    //   are acceptable, known values.
+    if (checks & ~(USPOOF_ALL_CHECKS | USPOOF_AUX_INFO)) {
+        *status = U_ILLEGAL_ARGUMENT_ERROR; 
+        return;
+    }
+
+    This->fChecks = checks;
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_getChecks(const USpoofChecker *sc, UErrorCode *status) {
+    const SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        return 0;
+    }
+    return This->fChecks;
+}
+
+U_CAPI void U_EXPORT2
+uspoof_setRestrictionLevel(USpoofChecker *sc, URestrictionLevel restrictionLevel) {
+    UErrorCode status = U_ZERO_ERROR;
+    SpoofImpl *This = SpoofImpl::validateThis(sc, status);
+    if (This != NULL) {
+        This->fRestrictionLevel = restrictionLevel;
+        This->fChecks |= USPOOF_RESTRICTION_LEVEL;
+    }
+}
+
+U_CAPI URestrictionLevel U_EXPORT2
+uspoof_getRestrictionLevel(const USpoofChecker *sc) {
+    UErrorCode status = U_ZERO_ERROR;
+    const SpoofImpl *This = SpoofImpl::validateThis(sc, status);
+    if (This == NULL) {
+        return USPOOF_UNRESTRICTIVE;
+    }
+    return This->fRestrictionLevel;
+}
+
+U_CAPI void U_EXPORT2
+uspoof_setAllowedLocales(USpoofChecker *sc, const char *localesList, UErrorCode *status) {
+    SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        return;
+    }
+    This->setAllowedLocales(localesList, *status);
+}
+
+U_CAPI const char * U_EXPORT2
+uspoof_getAllowedLocales(USpoofChecker *sc, UErrorCode *status) {
+    SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        return NULL;
+    }
+    return This->getAllowedLocales(*status);
+}
+
+
+U_CAPI const USet * U_EXPORT2
+uspoof_getAllowedChars(const USpoofChecker *sc, UErrorCode *status) {
+    const UnicodeSet *result = uspoof_getAllowedUnicodeSet(sc, status);
+    return result->toUSet();
+}
+
+U_CAPI const UnicodeSet * U_EXPORT2
+uspoof_getAllowedUnicodeSet(const USpoofChecker *sc, UErrorCode *status) {
+    const SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        return NULL;
+    }
+    return This->fAllowedCharsSet;
+}
+
+
+U_CAPI void U_EXPORT2
+uspoof_setAllowedChars(USpoofChecker *sc, const USet *chars, UErrorCode *status) {
+    const UnicodeSet *set = UnicodeSet::fromUSet(chars);
+    uspoof_setAllowedUnicodeSet(sc, set, status);
+}
+
+
+U_CAPI void U_EXPORT2
+uspoof_setAllowedUnicodeSet(USpoofChecker *sc, const UnicodeSet *chars, UErrorCode *status) {
+    SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        return;
+    }
+    if (chars->isBogus()) {
+        *status = U_ILLEGAL_ARGUMENT_ERROR;
+        return;
+    }
+    UnicodeSet *clonedSet = chars->clone();
+    if (clonedSet == NULL || clonedSet->isBogus()) {
+        *status = U_MEMORY_ALLOCATION_ERROR;
+        return;
+    }
+    clonedSet->freeze();
+    delete This->fAllowedCharsSet;
+    This->fAllowedCharsSet = clonedSet;
+    This->fChecks |= USPOOF_CHAR_LIMIT;
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_check(const USpoofChecker *sc,
+             const UChar *id, int32_t length,
+             int32_t *position,
+             UErrorCode *status) {
+
+    // Backwards compatibility:
+    if (position != NULL) {
+        *position = 0;
+    }
+
+    // Delegate to uspoof_check2
+    return uspoof_check2(sc, id, length, NULL, status);
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_check2(const USpoofChecker *sc,
+    const UChar* id, int32_t length,
+    USpoofCheckResult* checkResult,
+    UErrorCode *status) {
+
+    const SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        return 0;
+    }
+    if (length < -1) {
+        *status = U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+    UnicodeString idStr((length == -1), id, length);  // Aliasing constructor.
+    int32_t result = uspoof_check2UnicodeString(sc, idStr, checkResult, status);
+    return result;
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_checkUTF8(const USpoofChecker *sc,
+                 const char *id, int32_t length,
+                 int32_t *position,
+                 UErrorCode *status) {
+
+    // Backwards compatibility:
+    if (position != NULL) {
+        *position = 0;
+    }
+
+    // Delegate to uspoof_check2
+    return uspoof_check2UTF8(sc, id, length, NULL, status);
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_check2UTF8(const USpoofChecker *sc,
+    const char *id, int32_t length,
+    USpoofCheckResult* checkResult,
+    UErrorCode *status) {
+
+    if (U_FAILURE(*status)) {
+        return 0;
+    }
+    UnicodeString idStr = UnicodeString::fromUTF8(StringPiece(id, length>=0 ? length : static_cast<int32_t>(uprv_strlen(id))));
+    int32_t result = uspoof_check2UnicodeString(sc, idStr, checkResult, status);
+    return result;
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_areConfusable(const USpoofChecker *sc,
+                     const UChar *id1, int32_t length1,
+                     const UChar *id2, int32_t length2,
+                     UErrorCode *status) {
+    SpoofImpl::validateThis(sc, *status);
+    if (U_FAILURE(*status)) {
+        return 0;
+    }
+    if (length1 < -1 || length2 < -1) {
+        *status = U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+        
+    UnicodeString id1Str((length1==-1), id1, length1);  // Aliasing constructor
+    UnicodeString id2Str((length2==-1), id2, length2);  // Aliasing constructor
+    return uspoof_areConfusableUnicodeString(sc, id1Str, id2Str, status);
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_areConfusableUTF8(const USpoofChecker *sc,
+                         const char *id1, int32_t length1,
+                         const char *id2, int32_t length2,
+                         UErrorCode *status) {
+    SpoofImpl::validateThis(sc, *status);
+    if (U_FAILURE(*status)) {
+        return 0;
+    }
+    if (length1 < -1 || length2 < -1) {
+        *status = U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+    UnicodeString id1Str = UnicodeString::fromUTF8(StringPiece(id1, length1>=0? length1 : static_cast<int32_t>(uprv_strlen(id1))));
+    UnicodeString id2Str = UnicodeString::fromUTF8(StringPiece(id2, length2>=0? length2 : static_cast<int32_t>(uprv_strlen(id2))));
+    int32_t results = uspoof_areConfusableUnicodeString(sc, id1Str, id2Str, status);
+    return results;
+}
+ 
+
+U_CAPI int32_t U_EXPORT2
+uspoof_areConfusableUnicodeString(const USpoofChecker *sc,
+                                  const icu::UnicodeString &id1,
+                                  const icu::UnicodeString &id2,
+                                  UErrorCode *status) {
+    const SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (U_FAILURE(*status)) {
+        return 0;
+    }
+    //
+    // See section 4 of UAX 39 for the algorithm for checking whether two strings are confusable,
+    //   and for definitions of the types (single, whole, mixed-script) of confusables.
+    
+    // We only care about a few of the check flags.  Ignore the others.
+    // If no tests relevant to this function have been specified, return an error.
+    // TODO:  is this really the right thing to do?  It's probably an error on the caller's part,
+    //        but logically we would just return 0 (no error).
+    if ((This->fChecks & USPOOF_CONFUSABLE) == 0) {
+        *status = U_INVALID_STATE_ERROR;
+        return 0;
+    }
+
+    // Compute the skeletons and check for confusability.
+    UnicodeString id1Skeleton;
+    uspoof_getSkeletonUnicodeString(sc, 0 /* deprecated */, id1, id1Skeleton, status);
+    UnicodeString id2Skeleton;
+    uspoof_getSkeletonUnicodeString(sc, 0 /* deprecated */, id2, id2Skeleton, status);
+    if (U_FAILURE(*status)) { return 0; }
+    if (id1Skeleton != id2Skeleton) {
+        return 0;
+    }
+
+    // If we get here, the strings are confusable.  Now we just need to set the flags for the appropriate classes
+    // of confusables according to UTS 39 section 4.
+    // Start by computing the resolved script sets of id1 and id2.
+    ScriptSet id1RSS;
+    This->getResolvedScriptSet(id1, id1RSS, *status);
+    ScriptSet id2RSS;
+    This->getResolvedScriptSet(id2, id2RSS, *status);
+
+    // Turn on all applicable flags
+    int32_t result = 0;
+    if (id1RSS.intersects(id2RSS)) {
+        result |= USPOOF_SINGLE_SCRIPT_CONFUSABLE;
+    } else {
+        result |= USPOOF_MIXED_SCRIPT_CONFUSABLE;
+        if (!id1RSS.isEmpty() && !id2RSS.isEmpty()) {
+            result |= USPOOF_WHOLE_SCRIPT_CONFUSABLE;
+        }
+    }
+
+    // Turn off flags that the user doesn't want
+    if ((This->fChecks & USPOOF_SINGLE_SCRIPT_CONFUSABLE) == 0) {
+        result &= ~USPOOF_SINGLE_SCRIPT_CONFUSABLE;
+    }
+    if ((This->fChecks & USPOOF_MIXED_SCRIPT_CONFUSABLE) == 0) {
+        result &= ~USPOOF_MIXED_SCRIPT_CONFUSABLE;
+    }
+    if ((This->fChecks & USPOOF_WHOLE_SCRIPT_CONFUSABLE) == 0) {
+        result &= ~USPOOF_WHOLE_SCRIPT_CONFUSABLE;
+    }
+
+    return result;
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_checkUnicodeString(const USpoofChecker *sc,
+                          const icu::UnicodeString &id,
+                          int32_t *position,
+                          UErrorCode *status) {
+
+    // Backwards compatibility:
+    if (position != NULL) {
+        *position = 0;
+    }
+
+    // Delegate to uspoof_check2
+    return uspoof_check2UnicodeString(sc, id, NULL, status);
+}
+
+namespace {
+
+int32_t checkImpl(const SpoofImpl* This, const UnicodeString& id, CheckResult* checkResult, UErrorCode* status) {
+    U_ASSERT(This != NULL);
+    U_ASSERT(checkResult != NULL);
+    checkResult->clear();
+    int32_t result = 0;
+
+    if (0 != (This->fChecks & USPOOF_RESTRICTION_LEVEL)) {
+        URestrictionLevel idRestrictionLevel = This->getRestrictionLevel(id, *status);
+        if (idRestrictionLevel > This->fRestrictionLevel) {
+            result |= USPOOF_RESTRICTION_LEVEL;
+        }
+        checkResult->fRestrictionLevel = idRestrictionLevel;
+    }
+
+    if (0 != (This->fChecks & USPOOF_MIXED_NUMBERS)) {
+        UnicodeSet numerics;
+        This->getNumerics(id, numerics, *status);
+        if (numerics.size() > 1) {
+            result |= USPOOF_MIXED_NUMBERS;
+        }
+        checkResult->fNumerics = numerics;  // UnicodeSet::operator=
+    }
+
+    if (0 != (This->fChecks & USPOOF_HIDDEN_OVERLAY)) {
+        int32_t index = This->findHiddenOverlay(id, *status);
+        if (index != -1) {
+            result |= USPOOF_HIDDEN_OVERLAY;
+        }
+    }
+
+
+    if (0 != (This->fChecks & USPOOF_CHAR_LIMIT)) {
+        int32_t i;
+        UChar32 c;
+        int32_t length = id.length();
+        for (i=0; i<length ;) {
+            c = id.char32At(i);
+            i += U16_LENGTH(c);
+            if (!This->fAllowedCharsSet->contains(c)) {
+                result |= USPOOF_CHAR_LIMIT;
+                break;
+            }
+        }
+    }
+
+    if (0 != (This->fChecks & USPOOF_INVISIBLE)) {
+        // This check needs to be done on NFD input
+        UnicodeString nfdText;
+        gNfdNormalizer->normalize(id, nfdText, *status);
+        int32_t nfdLength = nfdText.length();
+
+        // scan for more than one occurrence of the same non-spacing mark
+        // in a sequence of non-spacing marks.
+        int32_t     i;
+        UChar32     c;
+        UChar32     firstNonspacingMark = 0;
+        UBool       haveMultipleMarks = FALSE;  
+        UnicodeSet  marksSeenSoFar;   // Set of combining marks in a single combining sequence.
+        
+        for (i=0; i<nfdLength ;) {
+            c = nfdText.char32At(i);
+            i += U16_LENGTH(c);
+            if (u_charType(c) != U_NON_SPACING_MARK) {
+                firstNonspacingMark = 0;
+                if (haveMultipleMarks) {
+                    marksSeenSoFar.clear();
+                    haveMultipleMarks = FALSE;
+                }
+                continue;
+            }
+            if (firstNonspacingMark == 0) {
+                firstNonspacingMark = c;
+                continue;
+            }
+            if (!haveMultipleMarks) {
+                marksSeenSoFar.add(firstNonspacingMark);
+                haveMultipleMarks = TRUE;
+            }
+            if (marksSeenSoFar.contains(c)) {
+                // report the error, and stop scanning.
+                // No need to find more than the first failure.
+                result |= USPOOF_INVISIBLE;
+                break;
+            }
+            marksSeenSoFar.add(c);
+        }
+    }
+
+    checkResult->fChecks = result;
+    return checkResult->toCombinedBitmask(This->fChecks);
+}
+
+}  // namespace
+
+U_CAPI int32_t U_EXPORT2
+uspoof_check2UnicodeString(const USpoofChecker *sc,
+                          const icu::UnicodeString &id,
+                          USpoofCheckResult* checkResult,
+                          UErrorCode *status) {
+    const SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        return FALSE;
+    }
+
+    if (checkResult != NULL) {
+        CheckResult* ThisCheckResult = CheckResult::validateThis(checkResult, *status);
+        if (ThisCheckResult == NULL) {
+            return FALSE;
+        }
+        return checkImpl(This, id, ThisCheckResult, status);
+    } else {
+        // Stack-allocate the checkResult since this method doesn't return it
+        CheckResult stackCheckResult;
+        return checkImpl(This, id, &stackCheckResult, status);
+    }
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_getSkeleton(const USpoofChecker *sc,
+                   uint32_t type,
+                   const UChar *id,  int32_t length,
+                   UChar *dest, int32_t destCapacity,
+                   UErrorCode *status) {
+
+    SpoofImpl::validateThis(sc, *status);
+    if (U_FAILURE(*status)) {
+        return 0;
+    }
+    if (length<-1 || destCapacity<0 || (destCapacity==0 && dest!=NULL)) {
+        *status = U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+
+    UnicodeString idStr((length==-1), id, length);  // Aliasing constructor
+    UnicodeString destStr;
+    uspoof_getSkeletonUnicodeString(sc, type, idStr, destStr, status);
+    destStr.extract(dest, destCapacity, *status);
+    return destStr.length();
+}
+
+
+
+U_I18N_API UnicodeString &  U_EXPORT2
+uspoof_getSkeletonUnicodeString(const USpoofChecker *sc,
+                                uint32_t /*type*/,
+                                const UnicodeString &id,
+                                UnicodeString &dest,
+                                UErrorCode *status) {
+    const SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (U_FAILURE(*status)) {
+        return dest;
+    }
+
+    UnicodeString nfdId;
+    gNfdNormalizer->normalize(id, nfdId, *status);
+
+    // Apply the skeleton mapping to the NFD normalized input string
+    // Accumulate the skeleton, possibly unnormalized, in a UnicodeString.
+    int32_t inputIndex = 0;
+    UnicodeString skelStr;
+    int32_t normalizedLen = nfdId.length();
+    for (inputIndex=0; inputIndex < normalizedLen; ) {
+        UChar32 c = nfdId.char32At(inputIndex);
+        inputIndex += U16_LENGTH(c);
+        This->fSpoofData->confusableLookup(c, skelStr);
+    }
+
+    gNfdNormalizer->normalize(skelStr, dest, *status);
+    return dest;
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_getSkeletonUTF8(const USpoofChecker *sc,
+                       uint32_t type,
+                       const char *id,  int32_t length,
+                       char *dest, int32_t destCapacity,
+                       UErrorCode *status) {
+    SpoofImpl::validateThis(sc, *status);
+    if (U_FAILURE(*status)) {
+        return 0;
+    }
+    if (length<-1 || destCapacity<0 || (destCapacity==0 && dest!=NULL)) {
+        *status = U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+
+    UnicodeString srcStr = UnicodeString::fromUTF8(StringPiece(id, length>=0 ? length : static_cast<int32_t>(uprv_strlen(id))));
+    UnicodeString destStr;
+    uspoof_getSkeletonUnicodeString(sc, type, srcStr, destStr, status);
+    if (U_FAILURE(*status)) {
+        return 0;
+    }
+
+    int32_t lengthInUTF8 = 0;
+    u_strToUTF8(dest, destCapacity, &lengthInUTF8,
+                destStr.getBuffer(), destStr.length(), status);
+    return lengthInUTF8;
+}
+
+
+U_CAPI int32_t U_EXPORT2
+uspoof_serialize(USpoofChecker *sc,void *buf, int32_t capacity, UErrorCode *status) {
+    SpoofImpl *This = SpoofImpl::validateThis(sc, *status);
+    if (This == NULL) {
+        U_ASSERT(U_FAILURE(*status));
+        return 0;
+    }
+
+    return This->fSpoofData->serialize(buf, capacity, *status);
+}
+
+U_CAPI const USet * U_EXPORT2
+uspoof_getInclusionSet(UErrorCode *status) {
+    umtx_initOnce(gSpoofInitStaticsOnce, &initializeStatics, *status);
+    return gInclusionSet->toUSet();
+}
+
+U_CAPI const USet * U_EXPORT2
+uspoof_getRecommendedSet(UErrorCode *status) {
+    umtx_initOnce(gSpoofInitStaticsOnce, &initializeStatics, *status);
+    return gRecommendedSet->toUSet();
+}
+
+U_I18N_API const UnicodeSet * U_EXPORT2
+uspoof_getInclusionUnicodeSet(UErrorCode *status) {
+    umtx_initOnce(gSpoofInitStaticsOnce, &initializeStatics, *status);
+    return gInclusionSet;
+}
+
+U_I18N_API const UnicodeSet * U_EXPORT2
+uspoof_getRecommendedUnicodeSet(UErrorCode *status) {
+    umtx_initOnce(gSpoofInitStaticsOnce, &initializeStatics, *status);
+    return gRecommendedSet;
+}
+
+//------------------
+// CheckResult APIs
+//------------------
+
+U_CAPI USpoofCheckResult* U_EXPORT2
+uspoof_openCheckResult(UErrorCode *status) {
+    CheckResult* checkResult = new CheckResult();
+    if (checkResult == NULL) {
+        *status = U_MEMORY_ALLOCATION_ERROR;
+        return NULL;
+    }
+    return checkResult->asUSpoofCheckResult();
+}
+
+U_CAPI void U_EXPORT2
+uspoof_closeCheckResult(USpoofCheckResult* checkResult) {
+    UErrorCode status = U_ZERO_ERROR;
+    CheckResult* This = CheckResult::validateThis(checkResult, status);
+    delete This;
+}
+
+U_CAPI int32_t U_EXPORT2
+uspoof_getCheckResultChecks(const USpoofCheckResult *checkResult, UErrorCode *status) {
+    const CheckResult* This = CheckResult::validateThis(checkResult, *status);
+    if (U_FAILURE(*status)) { return 0; }
+    return This->fChecks;
+}
+
+U_CAPI URestrictionLevel U_EXPORT2
+uspoof_getCheckResultRestrictionLevel(const USpoofCheckResult *checkResult, UErrorCode *status) {
+    const CheckResult* This = CheckResult::validateThis(checkResult, *status);
+    if (U_FAILURE(*status)) { return USPOOF_UNRESTRICTIVE; }
+    return This->fRestrictionLevel;
+}
+
+U_CAPI const USet* U_EXPORT2
+uspoof_getCheckResultNumerics(const USpoofCheckResult *checkResult, UErrorCode *status) {
+    const CheckResult* This = CheckResult::validateThis(checkResult, *status);
+    if (U_FAILURE(*status)) { return NULL; }
+    return This->fNumerics.toUSet();
+}
+
+
+
+#endif // !UCONFIG_NO_NORMALIZATION
diff --git a/thirdparty/icu4c/i18n/uspoof_impl.cpp b/thirdparty/icu4c/i18n/uspoof_impl.cpp
new file mode 100644
index 0000000000..b283d81321
--- /dev/null
+++ b/thirdparty/icu4c/i18n/uspoof_impl.cpp
@@ -0,0 +1,959 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+*   Copyright (C) 2008-2016, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*/
+
+#include "unicode/utypes.h"
+#include "unicode/uspoof.h"
+#include "unicode/uchar.h"
+#include "unicode/uniset.h"
+#include "unicode/utf16.h"
+#include "utrie2.h"
+#include "cmemory.h"
+#include "cstring.h"
+#include "scriptset.h"
+#include "umutex.h"
+#include "udataswp.h"
+#include "uassert.h"
+#include "ucln_in.h"
+#include "uspoof_impl.h"
+
+#if !UCONFIG_NO_NORMALIZATION
+
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(SpoofImpl)
+
+SpoofImpl::SpoofImpl(SpoofData *data, UErrorCode& status) {
+    construct(status);
+    fSpoofData = data;
+}
+
+SpoofImpl::SpoofImpl(UErrorCode& status) {
+    construct(status);
+
+    // TODO: Call this method where it is actually needed, instead of in the
+    // constructor, to allow for lazy data loading.  See #12696.
+    fSpoofData = SpoofData::getDefault(status);
+}
+
+SpoofImpl::SpoofImpl() {
+    UErrorCode status = U_ZERO_ERROR;
+    construct(status);
+
+    // TODO: Call this method where it is actually needed, instead of in the
+    // constructor, to allow for lazy data loading.  See #12696.
+    fSpoofData = SpoofData::getDefault(status);
+}
+
+void SpoofImpl::construct(UErrorCode& status) {
+    fChecks = USPOOF_ALL_CHECKS;
+    fSpoofData = NULL;
+    fAllowedCharsSet = NULL;
+    fAllowedLocales = NULL;
+    fRestrictionLevel = USPOOF_HIGHLY_RESTRICTIVE;
+
+    if (U_FAILURE(status)) { return; }
+
+    UnicodeSet *allowedCharsSet = new UnicodeSet(0, 0x10ffff);
+    fAllowedCharsSet = allowedCharsSet;
+    fAllowedLocales  = uprv_strdup("");
+    if (fAllowedCharsSet == NULL || fAllowedLocales == NULL) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+        return;
+    }
+    allowedCharsSet->freeze();
+}
+
+
+// Copy Constructor, used by the user level clone() function.
+SpoofImpl::SpoofImpl(const SpoofImpl &src, UErrorCode &status)  :
+        fChecks(USPOOF_ALL_CHECKS), fSpoofData(NULL), fAllowedCharsSet(NULL) , 
+        fAllowedLocales(NULL) {
+    if (U_FAILURE(status)) {
+        return;
+    }
+    fChecks = src.fChecks;
+    if (src.fSpoofData != NULL) {
+        fSpoofData = src.fSpoofData->addReference();
+    }
+    fAllowedCharsSet = src.fAllowedCharsSet->clone();
+    fAllowedLocales = uprv_strdup(src.fAllowedLocales);
+    if (fAllowedCharsSet == NULL || fAllowedLocales == NULL) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+    }
+    fRestrictionLevel = src.fRestrictionLevel;
+}
+
+SpoofImpl::~SpoofImpl() {
+    if (fSpoofData != NULL) {
+        fSpoofData->removeReference();   // Will delete if refCount goes to zero.
+    }
+    delete fAllowedCharsSet;
+    uprv_free((void *)fAllowedLocales);
+}
+
+//  Cast this instance as a USpoofChecker for the C API.
+USpoofChecker *SpoofImpl::asUSpoofChecker() {
+    return exportForC();
+}
+
+//
+//  Incoming parameter check on Status and the SpoofChecker object
+//    received from the C API.
+//
+const SpoofImpl *SpoofImpl::validateThis(const USpoofChecker *sc, UErrorCode &status) {
+    auto* This = validate(sc, status);
+    if (U_FAILURE(status)) {
+        return NULL;
+    }
+    if (This->fSpoofData != NULL && !This->fSpoofData->validateDataVersion(status)) {
+        return NULL;
+    }
+    return This;
+}
+
+SpoofImpl *SpoofImpl::validateThis(USpoofChecker *sc, UErrorCode &status) {
+    return const_cast<SpoofImpl *>
+        (SpoofImpl::validateThis(const_cast<const USpoofChecker *>(sc), status));
+}
+
+
+void SpoofImpl::setAllowedLocales(const char *localesList, UErrorCode &status) {
+    UnicodeSet    allowedChars;
+    UnicodeSet    *tmpSet = NULL;
+    const char    *locStart = localesList;
+    const char    *locEnd = NULL;
+    const char    *localesListEnd = localesList + uprv_strlen(localesList);
+    int32_t        localeListCount = 0;   // Number of locales provided by caller.
+
+    // Loop runs once per locale from the localesList, a comma separated list of locales.
+    do {
+        locEnd = uprv_strchr(locStart, ',');
+        if (locEnd == NULL) {
+            locEnd = localesListEnd;
+        }
+        while (*locStart == ' ') {
+            locStart++;
+        }
+        const char *trimmedEnd = locEnd-1;
+        while (trimmedEnd > locStart && *trimmedEnd == ' ') {
+            trimmedEnd--;
+        }
+        if (trimmedEnd <= locStart) {
+            break;
+        }
+        const char *locale = uprv_strndup(locStart, (int32_t)(trimmedEnd + 1 - locStart));
+        localeListCount++;
+
+        // We have one locale from the locales list.
+        // Add the script chars for this locale to the accumulating set of allowed chars.
+        // If the locale is no good, we will be notified back via status.
+        addScriptChars(locale, &allowedChars, status);
+        uprv_free((void *)locale);
+        if (U_FAILURE(status)) {
+            break;
+        }
+        locStart = locEnd + 1;
+    } while (locStart < localesListEnd);
+
+    // If our caller provided an empty list of locales, we disable the allowed characters checking
+    if (localeListCount == 0) {
+        uprv_free((void *)fAllowedLocales);
+        fAllowedLocales = uprv_strdup("");
+        tmpSet = new UnicodeSet(0, 0x10ffff);
+        if (fAllowedLocales == NULL || tmpSet == NULL) {
+            status = U_MEMORY_ALLOCATION_ERROR;
+            return;
+        } 
+        tmpSet->freeze();
+        delete fAllowedCharsSet;
+        fAllowedCharsSet = tmpSet;
+        fChecks &= ~USPOOF_CHAR_LIMIT;
+        return;
+    }
+
+        
+    // Add all common and inherited characters to the set of allowed chars.
+    UnicodeSet tempSet;
+    tempSet.applyIntPropertyValue(UCHAR_SCRIPT, USCRIPT_COMMON, status);
+    allowedChars.addAll(tempSet);
+    tempSet.applyIntPropertyValue(UCHAR_SCRIPT, USCRIPT_INHERITED, status);
+    allowedChars.addAll(tempSet);
+    
+    // If anything went wrong, we bail out without changing
+    // the state of the spoof checker.
+    if (U_FAILURE(status)) {
+        return;
+    }
+
+    // Store the updated spoof checker state.
+    tmpSet = allowedChars.clone();
+    const char *tmpLocalesList = uprv_strdup(localesList);
+    if (tmpSet == NULL || tmpLocalesList == NULL) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+        return;
+    }
+    uprv_free((void *)fAllowedLocales);
+    fAllowedLocales = tmpLocalesList;
+    tmpSet->freeze();
+    delete fAllowedCharsSet;
+    fAllowedCharsSet = tmpSet;
+    fChecks |= USPOOF_CHAR_LIMIT;
+}
+
+
+const char * SpoofImpl::getAllowedLocales(UErrorCode &/*status*/) {
+    return fAllowedLocales;
+}
+
+
+// Given a locale (a language), add all the characters from all of the scripts used with that language
+// to the allowedChars UnicodeSet
+
+void SpoofImpl::addScriptChars(const char *locale, UnicodeSet *allowedChars, UErrorCode &status) {
+    UScriptCode scripts[30];
+
+    int32_t numScripts = uscript_getCode(locale, scripts, UPRV_LENGTHOF(scripts), &status);
+    if (U_FAILURE(status)) {
+        return;
+    }
+    if (status == U_USING_DEFAULT_WARNING) {
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+        return;
+    }
+    UnicodeSet tmpSet;
+    int32_t    i;
+    for (i=0; i<numScripts; i++) {
+        tmpSet.applyIntPropertyValue(UCHAR_SCRIPT, scripts[i], status);
+        allowedChars->addAll(tmpSet);
+    }
+}
+
+// Computes the augmented script set for a code point, according to UTS 39 section 5.1.
+void SpoofImpl::getAugmentedScriptSet(UChar32 codePoint, ScriptSet& result, UErrorCode& status) {
+    result.resetAll();
+    result.setScriptExtensions(codePoint, status);
+    if (U_FAILURE(status)) { return; }
+
+    // Section 5.1 step 1
+    if (result.test(USCRIPT_HAN, status)) {
+        result.set(USCRIPT_HAN_WITH_BOPOMOFO, status);
+        result.set(USCRIPT_JAPANESE, status);
+        result.set(USCRIPT_KOREAN, status);
+    }
+    if (result.test(USCRIPT_HIRAGANA, status)) {
+        result.set(USCRIPT_JAPANESE, status);
+    }
+    if (result.test(USCRIPT_KATAKANA, status)) {
+        result.set(USCRIPT_JAPANESE, status);
+    }
+    if (result.test(USCRIPT_HANGUL, status)) {
+        result.set(USCRIPT_KOREAN, status);
+    }
+    if (result.test(USCRIPT_BOPOMOFO, status)) {
+        result.set(USCRIPT_HAN_WITH_BOPOMOFO, status);
+    }
+
+    // Section 5.1 step 2
+    if (result.test(USCRIPT_COMMON, status) || result.test(USCRIPT_INHERITED, status)) {
+        result.setAll();
+    }
+}
+
+// Computes the resolved script set for a string, according to UTS 39 section 5.1.
+void SpoofImpl::getResolvedScriptSet(const UnicodeString& input, ScriptSet& result, UErrorCode& status) const {
+    getResolvedScriptSetWithout(input, USCRIPT_CODE_LIMIT, result, status);
+}
+
+// Computes the resolved script set for a string, omitting characters having the specified script.
+// If USCRIPT_CODE_LIMIT is passed as the second argument, all characters are included.
+void SpoofImpl::getResolvedScriptSetWithout(const UnicodeString& input, UScriptCode script, ScriptSet& result, UErrorCode& status) const {
+    result.setAll();
+
+    ScriptSet temp;
+    UChar32 codePoint;
+    for (int32_t i = 0; i < input.length(); i += U16_LENGTH(codePoint)) {
+        codePoint = input.char32At(i);
+
+        // Compute the augmented script set for the character
+        getAugmentedScriptSet(codePoint, temp, status);
+        if (U_FAILURE(status)) { return; }
+
+        // Intersect the augmented script set with the resolved script set, but only if the character doesn't
+        // have the script specified in the function call
+        if (script == USCRIPT_CODE_LIMIT || !temp.test(script, status)) {
+            result.intersect(temp);
+        }
+    }
+}
+
+// Computes the set of numerics for a string, according to UTS 39 section 5.3.
+void SpoofImpl::getNumerics(const UnicodeString& input, UnicodeSet& result, UErrorCode& /*status*/) const {
+    result.clear();
+
+    UChar32 codePoint;
+    for (int32_t i = 0; i < input.length(); i += U16_LENGTH(codePoint)) {
+        codePoint = input.char32At(i);
+
+        // Store a representative character for each kind of decimal digit
+        if (u_charType(codePoint) == U_DECIMAL_DIGIT_NUMBER) {
+            // Store the zero character as a representative for comparison.
+            // Unicode guarantees it is codePoint - value
+            result.add(codePoint - (UChar32)u_getNumericValue(codePoint));
+        }
+    }
+}
+
+// Computes the restriction level of a string, according to UTS 39 section 5.2.
+URestrictionLevel SpoofImpl::getRestrictionLevel(const UnicodeString& input, UErrorCode& status) const {
+    // Section 5.2 step 1:
+    if (!fAllowedCharsSet->containsAll(input)) {
+        return USPOOF_UNRESTRICTIVE;
+    }
+
+    // Section 5.2 step 2
+    // Java use a static UnicodeSet for this test.  In C++, avoid the static variable
+    // and just do a simple for loop.
+    UBool allASCII = TRUE;
+    for (int32_t i=0, length=input.length(); i<length; i++) {
+        if (input.charAt(i) > 0x7f) {
+            allASCII = FALSE;
+            break;
+        }
+    }
+    if (allASCII) {
+        return USPOOF_ASCII;
+    }
+
+    // Section 5.2 steps 3:
+    ScriptSet resolvedScriptSet;
+    getResolvedScriptSet(input, resolvedScriptSet, status);
+    if (U_FAILURE(status)) { return USPOOF_UNRESTRICTIVE; }
+
+    // Section 5.2 step 4:
+    if (!resolvedScriptSet.isEmpty()) {
+        return USPOOF_SINGLE_SCRIPT_RESTRICTIVE;
+    }
+
+    // Section 5.2 step 5:
+    ScriptSet resolvedNoLatn;
+    getResolvedScriptSetWithout(input, USCRIPT_LATIN, resolvedNoLatn, status);
+    if (U_FAILURE(status)) { return USPOOF_UNRESTRICTIVE; }
+
+    // Section 5.2 step 6:
+    if (resolvedNoLatn.test(USCRIPT_HAN_WITH_BOPOMOFO, status)
+            || resolvedNoLatn.test(USCRIPT_JAPANESE, status)
+            || resolvedNoLatn.test(USCRIPT_KOREAN, status)) {
+        return USPOOF_HIGHLY_RESTRICTIVE;
+    }
+
+    // Section 5.2 step 7:
+    if (!resolvedNoLatn.isEmpty()
+            && !resolvedNoLatn.test(USCRIPT_CYRILLIC, status)
+            && !resolvedNoLatn.test(USCRIPT_GREEK, status)
+            && !resolvedNoLatn.test(USCRIPT_CHEROKEE, status)) {
+        return USPOOF_MODERATELY_RESTRICTIVE;
+    }
+
+    // Section 5.2 step 8:
+    return USPOOF_MINIMALLY_RESTRICTIVE;
+}
+
+int32_t SpoofImpl::findHiddenOverlay(const UnicodeString& input, UErrorCode&) const {
+    bool sawLeadCharacter = false;
+    for (int32_t i=0; i<input.length();) {
+        UChar32 cp = input.char32At(i);
+        if (sawLeadCharacter && cp == 0x0307) {
+            return i;
+        }
+        uint8_t combiningClass = u_getCombiningClass(cp);
+        // Skip over characters except for those with combining class 0 (non-combining characters) or with
+        // combining class 230 (same class as U+0307)
+        U_ASSERT(u_getCombiningClass(0x0307) == 230);
+        if (combiningClass == 0 || combiningClass == 230) {
+            sawLeadCharacter = isIllegalCombiningDotLeadCharacter(cp);
+        }
+        i += U16_LENGTH(cp);
+    }
+    return -1;
+}
+
+static inline bool isIllegalCombiningDotLeadCharacterNoLookup(UChar32 cp) {
+    return cp == u'i' || cp == u'j' || cp == u'ı' || cp == u'ȷ' || cp == u'l' ||
+           u_hasBinaryProperty(cp, UCHAR_SOFT_DOTTED);
+}
+
+bool SpoofImpl::isIllegalCombiningDotLeadCharacter(UChar32 cp) const {
+    if (isIllegalCombiningDotLeadCharacterNoLookup(cp)) {
+        return true;
+    }
+    UnicodeString skelStr;
+    fSpoofData->confusableLookup(cp, skelStr);
+    UChar32 finalCp = skelStr.char32At(skelStr.moveIndex32(skelStr.length(), -1));
+    if (finalCp != cp && isIllegalCombiningDotLeadCharacterNoLookup(finalCp)) {
+        return true;
+    }
+    return false;
+}
+
+
+
+// Convert a text format hex number.  Utility function used by builder code.  Static.
+// Input: UChar *string text.  Output: a UChar32
+// Input has been pre-checked, and will have no non-hex chars.
+// The number must fall in the code point range of 0..0x10ffff
+// Static Function.
+UChar32 SpoofImpl::ScanHex(const UChar *s, int32_t start, int32_t limit, UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return 0;
+    }
+    U_ASSERT(limit-start > 0);
+    uint32_t val = 0;
+    int i;
+    for (i=start; i<limit; i++) {
+        int digitVal = s[i] - 0x30;
+        if (digitVal>9) {
+            digitVal = 0xa + (s[i] - 0x41);  // Upper Case 'A'
+        }
+        if (digitVal>15) {
+            digitVal = 0xa + (s[i] - 0x61);  // Lower Case 'a'
+        }
+        U_ASSERT(digitVal <= 0xf);
+        val <<= 4;
+        val += digitVal;
+    }
+    if (val > 0x10ffff) {
+        status = U_PARSE_ERROR;
+        val = 0;
+    }
+    return (UChar32)val;
+}
+
+
+//-----------------------------------------
+//
+//   class CheckResult Implementation
+//
+//-----------------------------------------
+
+CheckResult::CheckResult() {
+    clear();
+}
+
+USpoofCheckResult* CheckResult::asUSpoofCheckResult() {
+    return exportForC();
+}
+
+//
+//  Incoming parameter check on Status and the CheckResult object
+//    received from the C API.
+//
+const CheckResult* CheckResult::validateThis(const USpoofCheckResult *ptr, UErrorCode &status) {
+    return validate(ptr, status);
+}
+
+CheckResult* CheckResult::validateThis(USpoofCheckResult *ptr, UErrorCode &status) {
+    return validate(ptr, status);
+}
+
+void CheckResult::clear() {
+    fChecks = 0;
+    fNumerics.clear();
+    fRestrictionLevel = USPOOF_UNDEFINED_RESTRICTIVE;
+}
+
+int32_t CheckResult::toCombinedBitmask(int32_t enabledChecks) {
+    if ((enabledChecks & USPOOF_AUX_INFO) != 0 && fRestrictionLevel != USPOOF_UNDEFINED_RESTRICTIVE) {
+        return fChecks | fRestrictionLevel;
+    } else {
+        return fChecks;
+    }
+}
+
+CheckResult::~CheckResult() {
+}
+
+//----------------------------------------------------------------------------------------------
+//
+//   class SpoofData Implementation
+//
+//----------------------------------------------------------------------------------------------
+
+
+UBool SpoofData::validateDataVersion(UErrorCode &status) const {
+    if (U_FAILURE(status) ||
+        fRawData == NULL ||
+        fRawData->fMagic != USPOOF_MAGIC ||
+        fRawData->fFormatVersion[0] != USPOOF_CONFUSABLE_DATA_FORMAT_VERSION ||
+        fRawData->fFormatVersion[1] != 0 ||
+        fRawData->fFormatVersion[2] != 0 ||
+        fRawData->fFormatVersion[3] != 0) {
+            status = U_INVALID_FORMAT_ERROR;
+            return FALSE;
+    }
+    return TRUE;
+}
+
+static UBool U_CALLCONV
+spoofDataIsAcceptable(void *context,
+                        const char * /* type */, const char * /*name*/,
+                        const UDataInfo *pInfo) {
+    if(
+        pInfo->size >= 20 &&
+        pInfo->isBigEndian == U_IS_BIG_ENDIAN &&
+        pInfo->charsetFamily == U_CHARSET_FAMILY &&
+        pInfo->dataFormat[0] == 0x43 &&  // dataFormat="Cfu "
+        pInfo->dataFormat[1] == 0x66 &&
+        pInfo->dataFormat[2] == 0x75 &&
+        pInfo->dataFormat[3] == 0x20 &&
+        pInfo->formatVersion[0] == USPOOF_CONFUSABLE_DATA_FORMAT_VERSION
+    ) {
+        UVersionInfo *version = static_cast<UVersionInfo *>(context);
+        if(version != NULL) {
+            uprv_memcpy(version, pInfo->dataVersion, 4);
+        }
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+//  Methods for the loading of the default confusables data file.  The confusable
+//  data is loaded only when it is needed.
+//
+//  SpoofData::getDefault() - Return the default confusables data, and call the
+//                            initOnce() if it is not available.  Adds a reference
+//                            to the SpoofData that the caller is responsible for
+//                            decrementing when they are done with the data.
+//
+//  uspoof_loadDefaultData - Called once, from initOnce().  The resulting SpoofData
+//                           is shared by all spoof checkers using the default data.
+//
+//  uspoof_cleanupDefaultData - Called during cleanup.
+//
+
+static UInitOnce gSpoofInitDefaultOnce = U_INITONCE_INITIALIZER;
+static SpoofData* gDefaultSpoofData;
+
+static UBool U_CALLCONV
+uspoof_cleanupDefaultData(void) {
+    if (gDefaultSpoofData) {
+        // Will delete, assuming all user-level spoof checkers were closed.
+        gDefaultSpoofData->removeReference();
+        gDefaultSpoofData = nullptr;
+        gSpoofInitDefaultOnce.reset();
+    }
+    return TRUE;
+}
+
+static void U_CALLCONV uspoof_loadDefaultData(UErrorCode& status) {
+    UDataMemory *udm = udata_openChoice(nullptr, "cfu", "confusables",
+                                        spoofDataIsAcceptable, 
+                                        nullptr,       // context, would receive dataVersion if supplied.
+                                        &status);
+    if (U_FAILURE(status)) { return; }
+    gDefaultSpoofData = new SpoofData(udm, status);
+    if (U_FAILURE(status)) {
+        delete gDefaultSpoofData;
+        gDefaultSpoofData = nullptr;
+        return;
+    }
+    if (gDefaultSpoofData == nullptr) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+        return;
+    }
+    ucln_i18n_registerCleanup(UCLN_I18N_SPOOFDATA, uspoof_cleanupDefaultData);
+}
+
+SpoofData* SpoofData::getDefault(UErrorCode& status) {
+    umtx_initOnce(gSpoofInitDefaultOnce, &uspoof_loadDefaultData, status);
+    if (U_FAILURE(status)) { return NULL; }
+    gDefaultSpoofData->addReference();
+    return gDefaultSpoofData;
+}
+
+
+
+SpoofData::SpoofData(UDataMemory *udm, UErrorCode &status)
+{
+    reset();
+    if (U_FAILURE(status)) {
+        return;
+    }
+    fUDM = udm;
+    // fRawData is non-const because it may be constructed by the data builder.
+    fRawData = reinterpret_cast<SpoofDataHeader *>(
+            const_cast<void *>(udata_getMemory(udm)));
+    validateDataVersion(status);
+    initPtrs(status);
+}
+
+
+SpoofData::SpoofData(const void *data, int32_t length, UErrorCode &status)
+{
+    reset();
+    if (U_FAILURE(status)) {
+        return;
+    }
+    if ((size_t)length < sizeof(SpoofDataHeader)) {
+        status = U_INVALID_FORMAT_ERROR;
+        return;
+    }
+    if (data == NULL) {
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+        return;
+    }
+    void *ncData = const_cast<void *>(data);
+    fRawData = static_cast<SpoofDataHeader *>(ncData);
+    if (length < fRawData->fLength) {
+        status = U_INVALID_FORMAT_ERROR;
+        return;
+    }
+    validateDataVersion(status);
+    initPtrs(status);
+}
+
+
+// Spoof Data constructor for use from data builder.
+//   Initializes a new, empty data area that will be populated later.
+SpoofData::SpoofData(UErrorCode &status) {
+    reset();
+    if (U_FAILURE(status)) {
+        return;
+    }
+    fDataOwned = true;
+
+    // The spoof header should already be sized to be a multiple of 16 bytes.
+    // Just in case it's not, round it up.
+    uint32_t initialSize = (sizeof(SpoofDataHeader) + 15) & ~15;
+    U_ASSERT(initialSize == sizeof(SpoofDataHeader));
+    
+    fRawData = static_cast<SpoofDataHeader *>(uprv_malloc(initialSize));
+    fMemLimit = initialSize;
+    if (fRawData == NULL) {
+        status = U_MEMORY_ALLOCATION_ERROR;
+        return;
+    }
+    uprv_memset(fRawData, 0, initialSize);
+
+    fRawData->fMagic = USPOOF_MAGIC;
+    fRawData->fFormatVersion[0] = USPOOF_CONFUSABLE_DATA_FORMAT_VERSION;
+    fRawData->fFormatVersion[1] = 0;
+    fRawData->fFormatVersion[2] = 0;
+    fRawData->fFormatVersion[3] = 0;
+    initPtrs(status);
+}
+
+// reset() - initialize all fields.
+//           Should be updated if any new fields are added.
+//           Called by constructors to put things in a known initial state.
+void SpoofData::reset() {
+   fRawData = NULL;
+   fDataOwned = FALSE;
+   fUDM      = NULL;
+   fMemLimit = 0;
+   fRefCount = 1;
+   fCFUKeys = NULL;
+   fCFUValues = NULL;
+   fCFUStrings = NULL;
+}
+
+
+//  SpoofData::initPtrs()
+//            Initialize the pointers to the various sections of the raw data.
+//
+//            This function is used both during the Trie building process (multiple
+//            times, as the individual data sections are added), and
+//            during the opening of a Spoof Checker from prebuilt data.
+//
+//            The pointers for non-existent data sections (identified by an offset of 0)
+//            are set to NULL.
+//
+//            Note:  During building the data, adding each new data section
+//            reallocs the raw data area, which likely relocates it, which
+//            in turn requires reinitializing all of the pointers into it, hence
+//            multiple calls to this function during building.
+//
+void SpoofData::initPtrs(UErrorCode &status) {
+    fCFUKeys = NULL;
+    fCFUValues = NULL;
+    fCFUStrings = NULL;
+    if (U_FAILURE(status)) {
+        return;
+    }
+    if (fRawData->fCFUKeys != 0) {
+        fCFUKeys = (int32_t *)((char *)fRawData + fRawData->fCFUKeys);
+    }
+    if (fRawData->fCFUStringIndex != 0) {
+        fCFUValues = (uint16_t *)((char *)fRawData + fRawData->fCFUStringIndex);
+    }
+    if (fRawData->fCFUStringTable != 0) {
+        fCFUStrings = (UChar *)((char *)fRawData + fRawData->fCFUStringTable);
+    }
+}
+
+
+SpoofData::~SpoofData() {
+    if (fDataOwned) {
+        uprv_free(fRawData);
+    }
+    fRawData = NULL;
+    if (fUDM != NULL) {
+        udata_close(fUDM);
+    }
+    fUDM = NULL;
+}
+
+
+void SpoofData::removeReference() {
+    if (umtx_atomic_dec(&fRefCount) == 0) {
+        delete this;
+    }
+}
+
+
+SpoofData *SpoofData::addReference() {
+    umtx_atomic_inc(&fRefCount);
+    return this;
+}
+
+
+void *SpoofData::reserveSpace(int32_t numBytes,  UErrorCode &status) {
+    if (U_FAILURE(status)) {
+        return NULL;
+    }
+    if (!fDataOwned) {
+        UPRV_UNREACHABLE_EXIT;
+    }
+
+    numBytes = (numBytes + 15) & ~15;   // Round up to a multiple of 16
+    uint32_t returnOffset = fMemLimit;
+    fMemLimit += numBytes;
+    fRawData = static_cast<SpoofDataHeader *>(uprv_realloc(fRawData, fMemLimit));
+    fRawData->fLength = fMemLimit;
+    uprv_memset((char *)fRawData + returnOffset, 0, numBytes);
+    initPtrs(status);
+    return (char *)fRawData + returnOffset;
+}
+
+int32_t SpoofData::serialize(void *buf, int32_t capacity, UErrorCode &status) const {
+    int32_t dataSize = fRawData->fLength;
+    if (capacity < dataSize) {
+        status = U_BUFFER_OVERFLOW_ERROR;
+        return dataSize;
+    }
+    uprv_memcpy(buf, fRawData, dataSize);
+    return dataSize;
+}
+
+int32_t SpoofData::size() const {
+    return fRawData->fLength;
+}
+
+//-------------------------------
+//
+// Front-end APIs for SpoofData
+//
+//-------------------------------
+
+int32_t SpoofData::confusableLookup(UChar32 inChar, UnicodeString &dest) const {
+    // Perform a binary search.
+    // [lo, hi), i.e lo is inclusive, hi is exclusive.
+    // The result after the loop will be in lo.
+    int32_t lo = 0;
+    int32_t hi = length();
+    do {
+        int32_t mid = (lo + hi) / 2;
+        if (codePointAt(mid) > inChar) {
+            hi = mid;
+        } else if (codePointAt(mid) < inChar) {
+            lo = mid;
+        } else {
+            // Found result.  Break early.
+            lo = mid;
+            break;
+        }
+    } while (hi - lo > 1);
+
+    // Did we find an entry?  If not, the char maps to itself.
+    if (codePointAt(lo) != inChar) {
+        dest.append(inChar);
+        return 1;
+    }
+
+    // Add the element to the string builder and return.
+    return appendValueTo(lo, dest);
+}
+
+int32_t SpoofData::length() const {
+    return fRawData->fCFUKeysSize;
+}
+
+UChar32 SpoofData::codePointAt(int32_t index) const {
+    return ConfusableDataUtils::keyToCodePoint(fCFUKeys[index]);
+}
+
+int32_t SpoofData::appendValueTo(int32_t index, UnicodeString& dest) const {
+    int32_t stringLength = ConfusableDataUtils::keyToLength(fCFUKeys[index]);
+
+    // Value is either a char (for strings of length 1) or
+    // an index into the string table (for longer strings)
+    uint16_t value = fCFUValues[index];
+    if (stringLength == 1) {
+        dest.append((UChar)value);
+    } else {
+        dest.append(fCFUStrings + value, stringLength);
+    }
+
+    return stringLength;
+}
+
+
+U_NAMESPACE_END
+
+U_NAMESPACE_USE
+
+//-----------------------------------------------------------------------------
+//
+//  uspoof_swap   -  byte swap and char encoding swap of spoof data
+//
+//-----------------------------------------------------------------------------
+U_CAPI int32_t U_EXPORT2
+uspoof_swap(const UDataSwapper *ds, const void *inData, int32_t length, void *outData,
+           UErrorCode *status) {
+
+    if (status == NULL || U_FAILURE(*status)) {
+        return 0;
+    }
+    if(ds==NULL || inData==NULL || length<-1 || (length>0 && outData==NULL)) {
+        *status=U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+
+    //
+    //  Check that the data header is for spoof data.
+    //    (Header contents are defined in gencfu.cpp)
+    //
+    const UDataInfo *pInfo = (const UDataInfo *)((const char *)inData+4);
+    if(!(  pInfo->dataFormat[0]==0x43 &&   /* dataFormat="Cfu " */
+           pInfo->dataFormat[1]==0x66 &&
+           pInfo->dataFormat[2]==0x75 &&
+           pInfo->dataFormat[3]==0x20 &&
+           pInfo->formatVersion[0]==USPOOF_CONFUSABLE_DATA_FORMAT_VERSION &&
+           pInfo->formatVersion[1]==0 &&
+           pInfo->formatVersion[2]==0 &&
+           pInfo->formatVersion[3]==0  )) {
+        udata_printError(ds, "uspoof_swap(): data format %02x.%02x.%02x.%02x "
+                             "(format version %02x %02x %02x %02x) is not recognized\n",
+                         pInfo->dataFormat[0], pInfo->dataFormat[1],
+                         pInfo->dataFormat[2], pInfo->dataFormat[3],
+                         pInfo->formatVersion[0], pInfo->formatVersion[1],
+                         pInfo->formatVersion[2], pInfo->formatVersion[3]);
+        *status=U_UNSUPPORTED_ERROR;
+        return 0;
+    }
+
+    //
+    // Swap the data header.  (This is the generic ICU Data Header, not the uspoof Specific
+    //                         header).  This swap also conveniently gets us
+    //                         the size of the ICU d.h., which lets us locate the start
+    //                         of the uspoof specific data.
+    //
+    int32_t headerSize=udata_swapDataHeader(ds, inData, length, outData, status);
+
+
+    //
+    // Get the Spoof Data Header, and check that it appears to be OK.
+    //
+    //
+    const uint8_t   *inBytes =(const uint8_t *)inData+headerSize;
+    SpoofDataHeader *spoofDH = (SpoofDataHeader *)inBytes;
+    if (ds->readUInt32(spoofDH->fMagic)   != USPOOF_MAGIC ||
+        ds->readUInt32(spoofDH->fLength)  <  sizeof(SpoofDataHeader)) 
+    {
+        udata_printError(ds, "uspoof_swap(): Spoof Data header is invalid.\n");
+        *status=U_UNSUPPORTED_ERROR;
+        return 0;
+    }
+
+    //
+    // Prefight operation?  Just return the size
+    //
+    int32_t spoofDataLength = ds->readUInt32(spoofDH->fLength);
+    int32_t totalSize = headerSize + spoofDataLength;
+    if (length < 0) {
+        return totalSize;
+    }
+
+    //
+    // Check that length passed in is consistent with length from Spoof data header.
+    //
+    if (length < totalSize) {
+        udata_printError(ds, "uspoof_swap(): too few bytes (%d after ICU Data header) for spoof data.\n",
+                            spoofDataLength);
+        *status=U_INDEX_OUTOFBOUNDS_ERROR;
+        return 0;
+        }
+
+
+    //
+    // Swap the Data.  Do the data itself first, then the Spoof Data Header, because
+    //                 we need to reference the header to locate the data, and an
+    //                 inplace swap of the header leaves it unusable.
+    //
+    uint8_t          *outBytes = (uint8_t *)outData + headerSize;
+    SpoofDataHeader  *outputDH = (SpoofDataHeader *)outBytes;
+
+    int32_t   sectionStart;
+    int32_t   sectionLength;
+
+    //
+    // If not swapping in place, zero out the output buffer before starting.
+    //    Gaps may exist between the individual sections, and these must be zeroed in
+    //    the output buffer.  The simplest way to do that is to just zero the whole thing.
+    //
+    if (inBytes != outBytes) {
+        uprv_memset(outBytes, 0, spoofDataLength);
+    }
+
+    // Confusables Keys Section   (fCFUKeys)
+    sectionStart  = ds->readUInt32(spoofDH->fCFUKeys);
+    sectionLength = ds->readUInt32(spoofDH->fCFUKeysSize) * 4;
+    ds->swapArray32(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status);
+
+    // String Index Section
+    sectionStart  = ds->readUInt32(spoofDH->fCFUStringIndex);
+    sectionLength = ds->readUInt32(spoofDH->fCFUStringIndexSize) * 2;
+    ds->swapArray16(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status);
+
+    // String Table Section
+    sectionStart  = ds->readUInt32(spoofDH->fCFUStringTable);
+    sectionLength = ds->readUInt32(spoofDH->fCFUStringTableLen) * 2;
+    ds->swapArray16(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status);
+
+    // And, last, swap the header itself.
+    //   int32_t   fMagic             // swap this
+    //   uint8_t   fFormatVersion[4]  // Do not swap this, just copy
+    //   int32_t   fLength and all the rest       // Swap the rest, all is 32 bit stuff.
+    //
+    uint32_t magic = ds->readUInt32(spoofDH->fMagic);
+    ds->writeUInt32((uint32_t *)&outputDH->fMagic, magic);
+
+    if (outputDH->fFormatVersion != spoofDH->fFormatVersion) {
+        uprv_memcpy(outputDH->fFormatVersion, spoofDH->fFormatVersion, sizeof(spoofDH->fFormatVersion));
+    }
+    // swap starting at fLength
+    ds->swapArray32(ds, &spoofDH->fLength, sizeof(SpoofDataHeader)-8 /* minus magic and fFormatVersion[4] */, &outputDH->fLength, status);
+
+    return totalSize;
+}
+
+#endif
+
+
diff --git a/thirdparty/icu4c/i18n/uspoof_impl.h b/thirdparty/icu4c/i18n/uspoof_impl.h
new file mode 100644
index 0000000000..e75ae262bd
--- /dev/null
+++ b/thirdparty/icu4c/i18n/uspoof_impl.h
@@ -0,0 +1,343 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+***************************************************************************
+* Copyright (C) 2008-2013, International Business Machines Corporation
+* and others. All Rights Reserved.
+***************************************************************************
+*
+*  uspoof_impl.h
+*
+*    Implementation header for spoof detection
+*
+*/
+
+#ifndef USPOOFIM_H
+#define USPOOFIM_H
+
+#include "uassert.h"
+#include "unicode/utypes.h"
+#include "unicode/uspoof.h"
+#include "unicode/uscript.h"
+#include "unicode/udata.h"
+#include "udataswp.h"
+#include "utrie2.h"
+
+#if !UCONFIG_NO_NORMALIZATION
+
+#ifdef __cplusplus
+
+#include "capi_helper.h"
+
+U_NAMESPACE_BEGIN
+
+// The maximum length (in UTF-16 UChars) of the skeleton replacement string resulting from
+//   a single input code point.  This is function of the unicode.org data.
+#define USPOOF_MAX_SKELETON_EXPANSION 20
+
+// The default stack buffer size for copies or conversions or normalizations
+// of input strings being checked.  (Used in multiple places.)
+#define USPOOF_STACK_BUFFER_SIZE 100
+
+// Magic number for sanity checking spoof data.
+#define USPOOF_MAGIC 0x3845fdef
+
+// Magic number for sanity checking spoof checkers.
+#define USPOOF_CHECK_MAGIC 0x2734ecde
+
+class ScriptSet;
+class SpoofData;
+struct SpoofDataHeader;
+class ConfusableDataUtils;
+
+/**
+  *  Class SpoofImpl corresponds directly to the plain C API opaque type
+  *  USpoofChecker.  One can be cast to the other.
+  */
+class SpoofImpl : public UObject,
+        public IcuCApiHelper<USpoofChecker, SpoofImpl, USPOOF_MAGIC> {
+public:
+    SpoofImpl(SpoofData *data, UErrorCode& status);
+    SpoofImpl(UErrorCode& status);
+    SpoofImpl();
+    void construct(UErrorCode& status);
+    virtual ~SpoofImpl();
+
+    /** Copy constructor, used by the user level uspoof_clone() function.
+     */
+    SpoofImpl(const SpoofImpl &src, UErrorCode &status);
+    
+    USpoofChecker *asUSpoofChecker();
+    static SpoofImpl *validateThis(USpoofChecker *sc, UErrorCode &status);
+    static const SpoofImpl *validateThis(const USpoofChecker *sc, UErrorCode &status);
+
+    /** Set and Get AllowedLocales, implementations of the corresponding API */
+    void setAllowedLocales(const char *localesList, UErrorCode &status);
+    const char * getAllowedLocales(UErrorCode &status);
+
+    // Add (union) to the UnicodeSet all of the characters for the scripts used for
+    // the specified locale.  Part of the implementation of setAllowedLocales.
+    void addScriptChars(const char *locale, UnicodeSet *allowedChars, UErrorCode &status);
+
+    // Functions implementing the features of UTS 39 section 5.
+    static void getAugmentedScriptSet(UChar32 codePoint, ScriptSet& result, UErrorCode& status);
+    void getResolvedScriptSet(const UnicodeString& input, ScriptSet& result, UErrorCode& status) const;
+    void getResolvedScriptSetWithout(const UnicodeString& input, UScriptCode script, ScriptSet& result, UErrorCode& status) const;
+    void getNumerics(const UnicodeString& input, UnicodeSet& result, UErrorCode& status) const;
+    URestrictionLevel getRestrictionLevel(const UnicodeString& input, UErrorCode& status) const;
+
+    int32_t findHiddenOverlay(const UnicodeString& input, UErrorCode& status) const;
+    bool isIllegalCombiningDotLeadCharacter(UChar32 cp) const;
+
+    /** parse a hex number.  Untility used by the builders.   */
+    static UChar32 ScanHex(const UChar *s, int32_t start, int32_t limit, UErrorCode &status);
+
+    static UClassID U_EXPORT2 getStaticClassID(void);
+    virtual UClassID getDynamicClassID(void) const override;
+
+    //
+    // Data Members
+    //
+
+    int32_t           fChecks;            // Bit vector of checks to perform.
+
+    SpoofData        *fSpoofData;
+    
+    const UnicodeSet *fAllowedCharsSet;   // The UnicodeSet of allowed characters.
+                                          //   for this Spoof Checker.  Defaults to all chars.
+
+    const char       *fAllowedLocales;    // The list of allowed locales.
+    URestrictionLevel fRestrictionLevel;  // The maximum restriction level for an acceptable identifier.
+};
+
+/**
+ *  Class CheckResult corresponds directly to the plain C API opaque type
+ *  USpoofCheckResult.  One can be cast to the other.
+ */
+class CheckResult : public UObject,
+        public IcuCApiHelper<USpoofCheckResult, CheckResult, USPOOF_CHECK_MAGIC> {
+public:
+    CheckResult();
+    virtual ~CheckResult();
+
+    USpoofCheckResult *asUSpoofCheckResult();
+    static CheckResult *validateThis(USpoofCheckResult *ptr, UErrorCode &status);
+    static const CheckResult *validateThis(const USpoofCheckResult *ptr, UErrorCode &status);
+
+    void clear();
+
+    // Used to convert this CheckResult to the older int32_t return value API
+    int32_t toCombinedBitmask(int32_t expectedChecks);
+
+    // Data Members
+    int32_t fChecks;                       // Bit vector of checks that were failed.
+    UnicodeSet fNumerics;                  // Set of numerics found in the string.
+    URestrictionLevel fRestrictionLevel;   // The restriction level of the string.
+};
+
+
+//
+//  Confusable Mappings Data Structures, version 2.0
+//
+//    For the confusable data, we are essentially implementing a map,
+//       key:    a code point
+//       value:  a string.  Most commonly one char in length, but can be more.
+//
+//    The keys are stored as a sorted array of 32 bit ints.
+//             bits 0-23    a code point value
+//             bits 24-31   length of value string, in UChars (between 1 and 256 UChars).
+//        The key table is sorted in ascending code point order.  (not on the
+//        32 bit int value, the flag bits do not participate in the sorting.)
+//
+//        Lookup is done by means of a binary search in the key table.
+//
+//    The corresponding values are kept in a parallel array of 16 bit ints.
+//        If the value string is of length 1, it is literally in the value array.
+//        For longer strings, the value array contains an index into the strings table.
+//
+//    String Table:
+//       The strings table contains all of the value strings (those of length two or greater)
+//       concatenated together into one long UChar (UTF-16) array.
+//
+//       There is no nul character or other mark between adjacent strings.
+//
+//----------------------------------------------------------------------------
+//
+//  Changes from format version 1 to format version 2:
+//      1) Removal of the whole-script confusable data tables.
+//      2) Removal of the SL/SA/ML/MA and multi-table flags in the key bitmask.
+//      3) Expansion of string length value in the key bitmask from 2 bits to 8 bits.
+//      4) Removal of the string lengths table since 8 bits is sufficient for the
+//         lengths of all entries in confusables.txt.
+
+
+
+// Internal functions for manipulating confusable data table keys
+#define USPOOF_CONFUSABLE_DATA_FORMAT_VERSION 2  // version for ICU 58
+class ConfusableDataUtils {
+public:
+    inline static UChar32 keyToCodePoint(int32_t key) {
+        return key & 0x00ffffff;
+    }
+    inline static int32_t keyToLength(int32_t key) {
+        return ((key & 0xff000000) >> 24) + 1;
+    }
+    inline static int32_t codePointAndLengthToKey(UChar32 codePoint, int32_t length) {
+        U_ASSERT((codePoint & 0x00ffffff) == codePoint);
+        U_ASSERT(length <= 256);
+        return codePoint | ((length - 1) << 24);
+    }
+};
+
+
+//-------------------------------------------------------------------------------------
+//
+//  SpoofData
+//
+//    A small class that wraps the raw (usually memory mapped) spoof data.
+//    Serves two primary functions:
+//      1.  Convenience.  Contains real pointers to the data, to avoid dealing with
+//          the offsets in the raw data.
+//      2.  Reference counting.  When a spoof checker is cloned, the raw data is shared
+//          and must be retained until all checkers using the data are closed.
+//    Nothing in this struct includes state that is specific to any particular
+//    USpoofDetector object.
+//
+//---------------------------------------------------------------------------------------
+class SpoofData: public UMemory {
+  public:
+    static SpoofData* getDefault(UErrorCode &status);   // Get standard ICU spoof data.
+    static void releaseDefault();   // Cleanup reference to default spoof data.
+
+    SpoofData(UErrorCode &status);   // Create new spoof data wrapper.
+                                     // Only used when building new data from rules.
+    
+    // Constructor for use when creating from prebuilt default data.
+    //   A UDataMemory is what the ICU internal data loading functions provide.
+    //   The udm is adopted by the SpoofData.
+    SpoofData(UDataMemory *udm, UErrorCode &status);
+
+    // Constructor for use when creating from serialized data.
+    //
+    SpoofData(const void *serializedData, int32_t length, UErrorCode &status);
+
+    //  Check raw Spoof Data Version compatibility.
+    //  Return true it looks good.
+    UBool validateDataVersion(UErrorCode &status) const;
+
+    ~SpoofData();                    // Destructor not normally used.
+                                     // Use removeReference() instead.
+    // Reference Counting functions.
+    //    Clone of a user-level spoof detector increments the ref count on the data.
+    //    Close of a user-level spoof detector decrements the ref count.
+    //    If the data is owned by us, it will be deleted when count goes to zero.
+    SpoofData *addReference(); 
+    void removeReference();
+
+    // Reset all fields to an initial state.
+    // Called from the top of all constructors.
+    void reset();
+
+    // Copy this instance's raw data buffer to the specified address.
+    int32_t serialize(void *buf, int32_t capacity, UErrorCode &status) const;
+
+    // Get the total number of bytes of data backed by this SpoofData.
+    // Not to be confused with length, which returns the number of confusable entries.
+    int32_t size() const;
+
+    // Get the confusable skeleton transform for a single code point.
+    // The result is a string with a length between 1 and 18 as of Unicode 9.
+    // This is the main public endpoint for this class.
+    // @return   The length in UTF-16 code units of the substitution string.
+    int32_t confusableLookup(UChar32 inChar, UnicodeString &dest) const;
+
+    // Get the number of confusable entries in this SpoofData.
+    int32_t length() const;
+
+    // Get the code point (key) at the specified index.
+    UChar32 codePointAt(int32_t index) const;
+
+    // Get the confusable skeleton (value) at the specified index.
+    // Append it to the specified UnicodeString&.
+    // @return   The length in UTF-16 code units of the skeleton string.
+    int32_t appendValueTo(int32_t index, UnicodeString& dest) const;
+
+  private:
+    // Reserve space in the raw data.  For use by builder when putting together a
+    //   new set of data.  Init the new storage to zero, to prevent inconsistent
+    //   results if it is not all otherwise set by the requester.
+    //  Return:
+    //    pointer to the new space that was added by this function.
+    void *reserveSpace(int32_t numBytes, UErrorCode &status);
+
+    // initialize the pointers from this object to the raw data.
+    void initPtrs(UErrorCode &status);
+
+    SpoofDataHeader             *fRawData;          // Ptr to the raw memory-mapped data
+    UBool                       fDataOwned;         // True if the raw data is owned, and needs
+                                                    //  to be deleted when refcount goes to zero.
+    UDataMemory                 *fUDM;              // If not NULL, our data came from a
+                                                    //   UDataMemory, which we must close when
+                                                    //   we are done.
+
+    uint32_t                    fMemLimit;          // Limit of available raw data space
+    u_atomic_int32_t            fRefCount;
+
+    // Confusable data
+    int32_t                     *fCFUKeys;
+    uint16_t                    *fCFUValues;
+    UChar                       *fCFUStrings;
+
+    friend class ConfusabledataBuilder;
+};
+
+//---------------------------------------------------------------------------------------
+//
+//  Raw Binary Data Formats, as loaded from the ICU data file,
+//    or as built by the builder.
+//
+//---------------------------------------------------------------------------------------
+struct SpoofDataHeader {
+    int32_t       fMagic;                // (0x3845fdef)
+    uint8_t       fFormatVersion[4];     // Data Format. Same as the value in struct UDataInfo
+                                         //   if there is one associated with this data.
+    int32_t       fLength;               // Total length in bytes of this spoof data,
+                                         //   including all sections, not just the header.
+
+    // The following four sections refer to data representing the confusable data
+    //   from the Unicode.org data from "confusables.txt"
+
+    int32_t       fCFUKeys;               // byte offset to Keys table (from SpoofDataHeader *)
+    int32_t       fCFUKeysSize;           // number of entries in keys table  (32 bits each)
+
+    // TODO: change name to fCFUValues, for consistency.
+    int32_t       fCFUStringIndex;        // byte offset to String Indexes table
+    int32_t       fCFUStringIndexSize;    // number of entries in String Indexes table (16 bits each)
+                                          //     (number of entries must be same as in Keys table
+
+    int32_t       fCFUStringTable;        // byte offset of String table
+    int32_t       fCFUStringTableLen;     // length of string table (in 16 bit UChars)
+
+    // The following sections are for data from xidmodifications.txt
+
+    int32_t       unused[15];              // Padding, Room for Expansion
+};
+
+
+
+U_NAMESPACE_END
+#endif /* __cplusplus */
+
+/**
+  * Endianness swap function for binary spoof data.
+  * @internal
+  */
+U_CAPI int32_t U_EXPORT2
+uspoof_swap(const UDataSwapper *ds, const void *inData, int32_t length, void *outData,
+            UErrorCode *status);
+
+
+#endif
+
+#endif  /* USPOOFIM_H */
+
diff --git a/thirdparty/icu4c/icudt71l.dat b/thirdparty/icu4c/icudt71l.dat
index 4c2c1c4d16..3fa3af9c23 100644
--- a/thirdparty/icu4c/icudt71l.dat
+++ b/thirdparty/icu4c/icudt71l.dat