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 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 *******************************************************************************
 *
 *   Copyright (C) 2009-2015, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  unorm2.h
 *   encoding:   UTF-8
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 2009dec15
 *   created by: Markus W. Scherer
 */
 
 #ifndef __UNORM2_H__
 #define __UNORM2_H__
 
 /**
  * \file
  * \brief C API: New API for Unicode Normalization.
  *
  * Unicode normalization functionality for standard Unicode normalization or
  * for using custom mapping tables.
  * All instances of UNormalizer2 are unmodifiable/immutable.
  * Instances returned by unorm2_getInstance() are singletons that must not be deleted by the caller.
  * For more details see the Normalizer2 C++ class.
  */
 
 #include "unicode/utypes.h"
 #include "unicode/stringoptions.h"
 #include "unicode/uset.h"
 
 #if U_SHOW_CPLUSPLUS_API
 #include "unicode/localpointer.h"
 #endif   // U_SHOW_CPLUSPLUS_API
 
 /**
  * Constants for normalization modes.
  * For details about standard Unicode normalization forms
  * and about the algorithms which are also used with custom mapping tables
  * see http://www.unicode.org/unicode/reports/tr15/
  * @stable ICU 4.4
  */
 typedef enum {
     /**
      * Decomposition followed by composition.
      * Same as standard NFC when using an "nfc" instance.
      * Same as standard NFKC when using an "nfkc" instance.
      * For details about standard Unicode normalization forms
      * see http://www.unicode.org/unicode/reports/tr15/
      * @stable ICU 4.4
      */
     UNORM2_COMPOSE,
     /**
      * Map, and reorder canonically.
      * Same as standard NFD when using an "nfc" instance.
      * Same as standard NFKD when using an "nfkc" instance.
      * For details about standard Unicode normalization forms
      * see http://www.unicode.org/unicode/reports/tr15/
      * @stable ICU 4.4
      */
     UNORM2_DECOMPOSE,
     /**
      * "Fast C or D" form.
      * If a string is in this form, then further decomposition <i>without reordering</i>
      * would yield the same form as DECOMPOSE.
      * Text in "Fast C or D" form can be processed efficiently with data tables
      * that are "canonically closed", that is, that provide equivalent data for
      * equivalent text, without having to be fully normalized.
      * Not a standard Unicode normalization form.
      * Not a unique form: Different FCD strings can be canonically equivalent.
      * For details see http://www.unicode.org/notes/tn5/#FCD
      * @stable ICU 4.4
      */
     UNORM2_FCD,
     /**
      * Compose only contiguously.
      * Also known as "FCC" or "Fast C Contiguous".
      * The result will often but not always be in NFC.
      * The result will conform to FCD which is useful for processing.
      * Not a standard Unicode normalization form.
      * For details see http://www.unicode.org/notes/tn5/#FCC
      * @stable ICU 4.4
      */
     UNORM2_COMPOSE_CONTIGUOUS
 } UNormalization2Mode;
 
 /**
  * Result values for normalization quick check functions.
  * For details see http://www.unicode.org/reports/tr15/#Detecting_Normalization_Forms
  * @stable ICU 2.0
  */
 typedef enum UNormalizationCheckResult {
   /**
    * The input string is not in the normalization form.
    * @stable ICU 2.0
    */
   UNORM_NO,
   /**
    * The input string is in the normalization form.
    * @stable ICU 2.0
    */
   UNORM_YES,
   /**
    * The input string may or may not be in the normalization form.
    * This value is only returned for composition forms like NFC and FCC,
    * when a backward-combining character is found for which the surrounding text
    * would have to be analyzed further.
    * @stable ICU 2.0
    */
   UNORM_MAYBE
 } UNormalizationCheckResult;
 
 /**
  * Opaque C service object type for the new normalization API.
  * @stable ICU 4.4
  */
 struct UNormalizer2;
 typedef struct UNormalizer2 UNormalizer2;  /**< C typedef for struct UNormalizer2. @stable ICU 4.4 */
 
 #if !UCONFIG_NO_NORMALIZATION
 
 /**
  * Returns a UNormalizer2 instance for Unicode NFC normalization.
  * Same as unorm2_getInstance(NULL, "nfc", UNORM2_COMPOSE, pErrorCode).
  * Returns an unmodifiable singleton instance. Do not delete it.
  * @param pErrorCode Standard ICU error code. Its input value must
  *                  pass the U_SUCCESS() test, or else the function returns
  *                  immediately. Check for U_FAILURE() on output or use with
  *                  function chaining. (See User Guide for details.)
  * @return the requested Normalizer2, if successful
  * @stable ICU 49
  */
 U_CAPI const UNormalizer2 * U_EXPORT2
 unorm2_getNFCInstance(UErrorCode *pErrorCode);
 
 /**
  * Returns a UNormalizer2 instance for Unicode NFD normalization.
  * Same as unorm2_getInstance(NULL, "nfc", UNORM2_DECOMPOSE, pErrorCode).
  * Returns an unmodifiable singleton instance. Do not delete it.
  * @param pErrorCode Standard ICU error code. Its input value must
  *                  pass the U_SUCCESS() test, or else the function returns
  *                  immediately. Check for U_FAILURE() on output or use with
  *                  function chaining. (See User Guide for details.)
  * @return the requested Normalizer2, if successful
  * @stable ICU 49
  */
 U_CAPI const UNormalizer2 * U_EXPORT2
 unorm2_getNFDInstance(UErrorCode *pErrorCode);
 
 /**
  * Returns a UNormalizer2 instance for Unicode NFKC normalization.
  * Same as unorm2_getInstance(NULL, "nfkc", UNORM2_COMPOSE, pErrorCode).
  * Returns an unmodifiable singleton instance. Do not delete it.
  * @param pErrorCode Standard ICU error code. Its input value must
  *                  pass the U_SUCCESS() test, or else the function returns
  *                  immediately. Check for U_FAILURE() on output or use with
  *                  function chaining. (See User Guide for details.)
  * @return the requested Normalizer2, if successful
  * @stable ICU 49
  */
 U_CAPI const UNormalizer2 * U_EXPORT2
 unorm2_getNFKCInstance(UErrorCode *pErrorCode);
 
 /**
  * Returns a UNormalizer2 instance for Unicode NFKD normalization.
  * Same as unorm2_getInstance(NULL, "nfkc", UNORM2_DECOMPOSE, pErrorCode).
  * Returns an unmodifiable singleton instance. Do not delete it.
  * @param pErrorCode Standard ICU error code. Its input value must
  *                  pass the U_SUCCESS() test, or else the function returns
  *                  immediately. Check for U_FAILURE() on output or use with
  *                  function chaining. (See User Guide for details.)
  * @return the requested Normalizer2, if successful
  * @stable ICU 49
  */
 U_CAPI const UNormalizer2 * U_EXPORT2
 unorm2_getNFKDInstance(UErrorCode *pErrorCode);
 
 /**
  * Returns a UNormalizer2 instance for Unicode toNFKC_Casefold() normalization
  * which is equivalent to applying the NFKC_Casefold mappings and then NFC.
  * See https://www.unicode.org/reports/tr44/#NFKC_Casefold
  *
  * Same as unorm2_getInstance(NULL, "nfkc_cf", UNORM2_COMPOSE, pErrorCode).
  * Returns an unmodifiable singleton instance. Do not delete it.
  * @param pErrorCode Standard ICU error code. Its input value must
  *                  pass the U_SUCCESS() test, or else the function returns
  *                  immediately. Check for U_FAILURE() on output or use with
  *                  function chaining. (See User Guide for details.)
  * @return the requested Normalizer2, if successful
  * @stable ICU 49
  */
 U_CAPI const UNormalizer2 * U_EXPORT2
 unorm2_getNFKCCasefoldInstance(UErrorCode *pErrorCode);
 
 /**
  * Returns a UNormalizer2 instance for a variant of Unicode toNFKC_Casefold() normalization
  * which is equivalent to applying the NFKC_Simple_Casefold mappings and then NFC.
  * See https://www.unicode.org/reports/tr44/#NFKC_Simple_Casefold
  *
  * Same as unorm2_getInstance(NULL, "nfkc_scf", UNORM2_COMPOSE, pErrorCode).
  * Returns an unmodifiable singleton instance. Do not delete it.
  * @param pErrorCode Standard ICU error code. Its input value must
  *                  pass the U_SUCCESS() test, or else the function returns
  *                  immediately. Check for U_FAILURE() on output or use with
  *                  function chaining. (See User Guide for details.)
  * @return the requested Normalizer2, if successful
  * @stable ICU 74
  */
 U_CAPI const UNormalizer2 * U_EXPORT2
 unorm2_getNFKCSimpleCasefoldInstance(UErrorCode *pErrorCode);
 
 /**
  * Returns a UNormalizer2 instance which uses the specified data file
  * (packageName/name similar to ucnv_openPackage() and ures_open()/ResourceBundle)
  * and which composes or decomposes text according to the specified mode.
  * Returns an unmodifiable singleton instance. Do not delete it.
  *
  * Use packageName=NULL for data files that are part of ICU's own data.
  * Use name="nfc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFC/NFD.
  * Use name="nfkc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFKC/NFKD.
  * Use name="nfkc_cf" and UNORM2_COMPOSE for Unicode standard NFKC_CF=NFKC_Casefold.
  *
  * @param packageName NULL for ICU built-in data, otherwise application data package name
  * @param name "nfc" or "nfkc" or "nfkc_cf" or "nfkc_scf" or name of custom data file
  * @param mode normalization mode (compose or decompose etc.)
  * @param pErrorCode Standard ICU error code. Its input value must
  *                  pass the U_SUCCESS() test, or else the function returns
  *                  immediately. Check for U_FAILURE() on output or use with
  *                  function chaining. (See User Guide for details.)
  * @return the requested UNormalizer2, if successful
  * @stable ICU 4.4
  */
 U_CAPI const UNormalizer2 * U_EXPORT2
 unorm2_getInstance(const char *packageName,
                    const char *name,
                    UNormalization2Mode mode,
                    UErrorCode *pErrorCode);
 
 /**
  * Constructs a filtered normalizer wrapping any UNormalizer2 instance
  * and a filter set.
  * Both are aliased and must not be modified or deleted while this object
  * is used.
  * The filter set should be frozen; otherwise the performance will suffer greatly.
  * @param norm2 wrapped UNormalizer2 instance
  * @param filterSet USet which determines the characters to be normalized
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return the requested UNormalizer2, if successful
  * @stable ICU 4.4
  */
 U_CAPI UNormalizer2 * U_EXPORT2
 unorm2_openFiltered(const UNormalizer2 *norm2, const USet *filterSet, UErrorCode *pErrorCode);
 
 /**
  * Closes a UNormalizer2 instance from unorm2_openFiltered().
  * Do not close instances from unorm2_getInstance()!
  * @param norm2 UNormalizer2 instance to be closed
  * @stable ICU 4.4
  */
 U_CAPI void U_EXPORT2
 unorm2_close(UNormalizer2 *norm2);
 
 #if U_SHOW_CPLUSPLUS_API
 
 U_NAMESPACE_BEGIN
 
 /**
  * \class LocalUNormalizer2Pointer
  * "Smart pointer" class, closes a UNormalizer2 via unorm2_close().
  * For most methods see the LocalPointerBase base class.
  *
  * @see LocalPointerBase
  * @see LocalPointer
  * @stable ICU 4.4
  */
 U_DEFINE_LOCAL_OPEN_POINTER(LocalUNormalizer2Pointer, UNormalizer2, unorm2_close);
 
 U_NAMESPACE_END
 
 #endif
 
 /**
  * Writes the normalized form of the source string to the destination string
  * (replacing its contents) and returns the length of the destination string.
  * The source and destination strings must be different buffers.
  * @param norm2 UNormalizer2 instance
  * @param src source string
  * @param length length of the source string, or -1 if NUL-terminated
  * @param dest destination string; its contents is replaced with normalized src
  * @param capacity number of UChars that can be written to dest
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return dest
  * @stable ICU 4.4
  */
 U_CAPI int32_t U_EXPORT2
 unorm2_normalize(const UNormalizer2 *norm2,
                  const UChar *src, int32_t length,
                  UChar *dest, int32_t capacity,
                  UErrorCode *pErrorCode);
 /**
  * Appends the normalized form of the second string to the first string
  * (merging them at the boundary) and returns the length of the first string.
  * The result is normalized if the first string was normalized.
  * The first and second strings must be different buffers.
  * @param norm2 UNormalizer2 instance
  * @param first string, should be normalized
  * @param firstLength length of the first string, or -1 if NUL-terminated
  * @param firstCapacity number of UChars that can be written to first
  * @param second string, will be normalized
  * @param secondLength length of the source string, or -1 if NUL-terminated
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return first
  * @stable ICU 4.4
  */
 U_CAPI int32_t U_EXPORT2
 unorm2_normalizeSecondAndAppend(const UNormalizer2 *norm2,
                                 UChar *first, int32_t firstLength, int32_t firstCapacity,
                                 const UChar *second, int32_t secondLength,
                                 UErrorCode *pErrorCode);
 /**
  * Appends the second string to the first string
  * (merging them at the boundary) and returns the length of the first string.
  * The result is normalized if both the strings were normalized.
  * The first and second strings must be different buffers.
  * @param norm2 UNormalizer2 instance
  * @param first string, should be normalized
  * @param firstLength length of the first string, or -1 if NUL-terminated
  * @param firstCapacity number of UChars that can be written to first
  * @param second string, should be normalized
  * @param secondLength length of the source string, or -1 if NUL-terminated
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return first
  * @stable ICU 4.4
  */
 U_CAPI int32_t U_EXPORT2
 unorm2_append(const UNormalizer2 *norm2,
               UChar *first, int32_t firstLength, int32_t firstCapacity,
               const UChar *second, int32_t secondLength,
               UErrorCode *pErrorCode);
 
 /**
  * Gets the decomposition mapping of c.
  * Roughly equivalent to normalizing the String form of c
  * on a UNORM2_DECOMPOSE UNormalizer2 instance, but much faster, and except that this function
  * returns a negative value and does not write a string
  * if c does not have a decomposition mapping in this instance's data.
  * This function is independent of the mode of the UNormalizer2.
  * @param norm2 UNormalizer2 instance
  * @param c code point
  * @param decomposition String buffer which will be set to c's
  *                      decomposition mapping, if there is one.
  * @param capacity number of UChars that can be written to decomposition
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return the non-negative length of c's decomposition, if there is one; otherwise a negative value
  * @stable ICU 4.6
  */
 U_CAPI int32_t U_EXPORT2
 unorm2_getDecomposition(const UNormalizer2 *norm2,
                         UChar32 c, UChar *decomposition, int32_t capacity,
                         UErrorCode *pErrorCode);
 
 /**
  * Gets the raw decomposition mapping of c.
  *
  * This is similar to the unorm2_getDecomposition() function but returns the
  * raw decomposition mapping as specified in UnicodeData.txt or
  * (for custom data) in the mapping files processed by the gennorm2 tool.
  * By contrast, unorm2_getDecomposition() returns the processed,
  * recursively-decomposed version of this mapping.
  *
  * When used on a standard NFKC Normalizer2 instance,
  * unorm2_getRawDecomposition() returns the Unicode Decomposition_Mapping (dm) property.
  *
  * When used on a standard NFC Normalizer2 instance,
  * it returns the Decomposition_Mapping only if the Decomposition_Type (dt) is Canonical (Can);
  * in this case, the result contains either one or two code points (=1..4 UChars).
  *
  * This function is independent of the mode of the UNormalizer2.
  * @param norm2 UNormalizer2 instance
  * @param c code point
  * @param decomposition String buffer which will be set to c's
  *                      raw decomposition mapping, if there is one.
  * @param capacity number of UChars that can be written to decomposition
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return the non-negative length of c's raw decomposition, if there is one; otherwise a negative value
  * @stable ICU 49
  */
 U_CAPI int32_t U_EXPORT2
 unorm2_getRawDecomposition(const UNormalizer2 *norm2,
                            UChar32 c, UChar *decomposition, int32_t capacity,
                            UErrorCode *pErrorCode);
 
 /**
  * Performs pairwise composition of a & b and returns the composite if there is one.
  *
  * Returns a composite code point c only if c has a two-way mapping to a+b.
  * In standard Unicode normalization, this means that
  * c has a canonical decomposition to a+b
  * and c does not have the Full_Composition_Exclusion property.
  *
  * This function is independent of the mode of the UNormalizer2.
  * @param norm2 UNormalizer2 instance
  * @param a A (normalization starter) code point.
  * @param b Another code point.
  * @return The non-negative composite code point if there is one; otherwise a negative value.
  * @stable ICU 49
  */
 U_CAPI UChar32 U_EXPORT2
 unorm2_composePair(const UNormalizer2 *norm2, UChar32 a, UChar32 b);
 
 /**
  * Gets the combining class of c.
  * The default implementation returns 0
  * but all standard implementations return the Unicode Canonical_Combining_Class value.
  * @param norm2 UNormalizer2 instance
  * @param c code point
  * @return c's combining class
  * @stable ICU 49
  */
 U_CAPI uint8_t U_EXPORT2
 unorm2_getCombiningClass(const UNormalizer2 *norm2, UChar32 c);
 
 /**
  * Tests if the string is normalized.
  * Internally, in cases where the quickCheck() method would return "maybe"
  * (which is only possible for the two COMPOSE modes) this method
  * resolves to "yes" or "no" to provide a definitive result,
  * at the cost of doing more work in those cases.
  * @param norm2 UNormalizer2 instance
  * @param s input string
  * @param length length of the string, or -1 if NUL-terminated
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return true if s is normalized
  * @stable ICU 4.4
  */
 U_CAPI UBool U_EXPORT2
 unorm2_isNormalized(const UNormalizer2 *norm2,
                     const UChar *s, int32_t length,
                     UErrorCode *pErrorCode);
 
 /**
  * Tests if the string is normalized.
  * For the two COMPOSE modes, the result could be "maybe" in cases that
  * would take a little more work to resolve definitively.
  * Use spanQuickCheckYes() and normalizeSecondAndAppend() for a faster
  * combination of quick check + normalization, to avoid
  * re-checking the "yes" prefix.
  * @param norm2 UNormalizer2 instance
  * @param s input string
  * @param length length of the string, or -1 if NUL-terminated
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return UNormalizationCheckResult
  * @stable ICU 4.4
  */
 U_CAPI UNormalizationCheckResult U_EXPORT2
 unorm2_quickCheck(const UNormalizer2 *norm2,
                   const UChar *s, int32_t length,
                   UErrorCode *pErrorCode);
 
 /**
  * Returns the end of the normalized substring of the input string.
  * In other words, with <code>end=spanQuickCheckYes(s, ec);</code>
  * the substring <code>UnicodeString(s, 0, end)</code>
  * will pass the quick check with a "yes" result.
  *
  * The returned end index is usually one or more characters before the
  * "no" or "maybe" character: The end index is at a normalization boundary.
  * (See the class documentation for more about normalization boundaries.)
  *
  * When the goal is a normalized string and most input strings are expected
  * to be normalized already, then call this method,
  * and if it returns a prefix shorter than the input string,
  * copy that prefix and use normalizeSecondAndAppend() for the remainder.
  * @param norm2 UNormalizer2 instance
  * @param s input string
  * @param length length of the string, or -1 if NUL-terminated
  * @param pErrorCode Standard ICU error code. Its input value must
  *                   pass the U_SUCCESS() test, or else the function returns
  *                   immediately. Check for U_FAILURE() on output or use with
  *                   function chaining. (See User Guide for details.)
  * @return "yes" span end index
  * @stable ICU 4.4
  */
 U_CAPI int32_t U_EXPORT2
 unorm2_spanQuickCheckYes(const UNormalizer2 *norm2,
                          const UChar *s, int32_t length,
                          UErrorCode *pErrorCode);
 
 /**
  * Tests if the character always has a normalization boundary before it,
  * regardless of context.
  * For details see the Normalizer2 base class documentation.
  * @param norm2 UNormalizer2 instance
  * @param c character to test
  * @return true if c has a normalization boundary before it
  * @stable ICU 4.4
  */
 U_CAPI UBool U_EXPORT2
 unorm2_hasBoundaryBefore(const UNormalizer2 *norm2, UChar32 c);
 
 /**
  * Tests if the character always has a normalization boundary after it,
  * regardless of context.
  * For details see the Normalizer2 base class documentation.
  * @param norm2 UNormalizer2 instance
  * @param c character to test
  * @return true if c has a normalization boundary after it
  * @stable ICU 4.4
  */
 U_CAPI UBool U_EXPORT2
 unorm2_hasBoundaryAfter(const UNormalizer2 *norm2, UChar32 c);
 
 /**
  * Tests if the character is normalization-inert.
  * For details see the Normalizer2 base class documentation.
  * @param norm2 UNormalizer2 instance
  * @param c character to test
  * @return true if c is normalization-inert
  * @stable ICU 4.4
  */
 U_CAPI UBool U_EXPORT2
 unorm2_isInert(const UNormalizer2 *norm2, UChar32 c);
 
 /**
  * Compares two strings for canonical equivalence.
  * Further options include case-insensitive comparison and
  * code point order (as opposed to code unit order).
  *
  * Canonical equivalence between two strings is defined as their normalized
  * forms (NFD or NFC) being identical.
  * This function compares strings incrementally instead of normalizing
  * (and optionally case-folding) both strings entirely,
  * improving performance significantly.
  *
  * Bulk normalization is only necessary if the strings do not fulfill the FCD
  * conditions. Only in this case, and only if the strings are relatively long,
  * is memory allocated temporarily.
  * For FCD strings and short non-FCD strings there is no memory allocation.
  *
  * Semantically, this is equivalent to
  *   strcmp[CodePointOrder](NFD(foldCase(NFD(s1))), NFD(foldCase(NFD(s2))))
  * where code point order and foldCase are all optional.
  *
  * UAX 21 2.5 Caseless Matching specifies that for a canonical caseless match
  * the case folding must be performed first, then the normalization.
  *
  * @param s1 First source string.
  * @param length1 Length of first source string, or -1 if NUL-terminated.
  *
  * @param s2 Second source string.
  * @param length2 Length of second source string, or -1 if NUL-terminated.
  *
  * @param options A bit set of options:
  *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
  *     Case-sensitive comparison in code unit order, and the input strings
  *     are quick-checked for FCD.
  *
  *   - UNORM_INPUT_IS_FCD
  *     Set if the caller knows that both s1 and s2 fulfill the FCD conditions.
  *     If not set, the function will quickCheck for FCD
  *     and normalize if necessary.
  *
  *   - U_COMPARE_CODE_POINT_ORDER
  *     Set to choose code point order instead of code unit order
  *     (see u_strCompare for details).
  *
  *   - U_COMPARE_IGNORE_CASE
  *     Set to compare strings case-insensitively using case folding,
  *     instead of case-sensitively.
  *     If set, then the following case folding options are used.
  *
  *   - Options as used with case-insensitive comparisons, currently:
  *
  *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
  *    (see u_strCaseCompare for details)
  *
  *   - regular normalization options shifted left by UNORM_COMPARE_NORM_OPTIONS_SHIFT
  *
  * @param pErrorCode ICU error code in/out parameter.
  *                   Must fulfill U_SUCCESS before the function call.
  * @return <0 or 0 or >0 as usual for string comparisons
  *
  * @see unorm_normalize
  * @see UNORM_FCD
  * @see u_strCompare
  * @see u_strCaseCompare
  *
  * @stable ICU 2.2
  */
 U_CAPI int32_t U_EXPORT2
 unorm_compare(const UChar *s1, int32_t length1,
               const UChar *s2, int32_t length2,
               uint32_t options,
               UErrorCode *pErrorCode);
 
 #endif  /* !UCONFIG_NO_NORMALIZATION */
 #endif  /* __UNORM2_H__ */

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