The Tor Browser: intl/icu/source/common/normalizer2impl.h@129ffea94266 (annotated)

intl/icu/source/common/normalizer2impl.h@129ffea94266 (annotated)

intl/icu/source/common/normalizer2impl.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
 *******************************************************************************
 *
 *   Copyright (C) 2009-2013, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  normalizer2impl.h
 *   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 2009nov22
 *   created by: Markus W. Scherer
 */
 #ifndef __NORMALIZER2IMPL_H__
 #define __NORMALIZER2IMPL_H__
 #include "unicode/utypes.h"
 #if !UCONFIG_NO_NORMALIZATION
 #include "unicode/normalizer2.h"
 #include "unicode/udata.h"
 #include "unicode/unistr.h"
 #include "unicode/unorm.h"
 #include "unicode/utf16.h"
 #include "mutex.h"
 #include "uset_imp.h"
 #include "utrie2.h"
 U_NAMESPACE_BEGIN
 struct CanonIterData;
 class Hangul {
 public:
     /* Korean Hangul and Jamo constants */
     enum {
         JAMO_L_BASE=0x1100,     /* "lead" jamo */
         JAMO_V_BASE=0x1161,     /* "vowel" jamo */
         JAMO_T_BASE=0x11a7,     /* "trail" jamo */
         HANGUL_BASE=0xac00,
         JAMO_L_COUNT=19,
         JAMO_V_COUNT=21,
         JAMO_T_COUNT=28,
         JAMO_VT_COUNT=JAMO_V_COUNT*JAMO_T_COUNT,
         HANGUL_COUNT=JAMO_L_COUNT*JAMO_V_COUNT*JAMO_T_COUNT,
         HANGUL_LIMIT=HANGUL_BASE+HANGUL_COUNT
     };
     static inline UBool isHangul(UChar32 c) {
         return HANGUL_BASE<=c && c<HANGUL_LIMIT;
     }
     static inline UBool
     isHangulWithoutJamoT(UChar c) {
         c-=HANGUL_BASE;
         return c<HANGUL_COUNT && c%JAMO_T_COUNT==0;
     }
     static inline UBool isJamoL(UChar32 c) {
         return (uint32_t)(c-JAMO_L_BASE)<JAMO_L_COUNT;
     }
     static inline UBool isJamoV(UChar32 c) {
         return (uint32_t)(c-JAMO_V_BASE)<JAMO_V_COUNT;
     }
     /**
      * Decomposes c, which must be a Hangul syllable, into buffer
      * and returns the length of the decomposition (2 or 3).
      */
     static inline int32_t decompose(UChar32 c, UChar buffer[3]) {
         c-=HANGUL_BASE;
         UChar32 c2=c%JAMO_T_COUNT;
         c/=JAMO_T_COUNT;
         buffer[0]=(UChar)(JAMO_L_BASE+c/JAMO_V_COUNT);
         buffer[1]=(UChar)(JAMO_V_BASE+c%JAMO_V_COUNT);
         if(c2==0) {
             return 2;
         } else {
             buffer[2]=(UChar)(JAMO_T_BASE+c2);
             return 3;
         }
     }
     /**
      * Decomposes c, which must be a Hangul syllable, into buffer.
      * This is the raw, not recursive, decomposition. Its length is always 2.
      */
     static inline void getRawDecomposition(UChar32 c, UChar buffer[2]) {
         UChar32 orig=c;
         c-=HANGUL_BASE;
         UChar32 c2=c%JAMO_T_COUNT;
         if(c2==0) {
             c/=JAMO_T_COUNT;
             buffer[0]=(UChar)(JAMO_L_BASE+c/JAMO_V_COUNT);
             buffer[1]=(UChar)(JAMO_V_BASE+c%JAMO_V_COUNT);
         } else {
             buffer[0]=orig-c2;  // LV syllable
             buffer[1]=(UChar)(JAMO_T_BASE+c2);
         }
     }
 private:
     Hangul();  // no instantiation
 };
 class Normalizer2Impl;
 class ReorderingBuffer : public UMemory {
 public:
     ReorderingBuffer(const Normalizer2Impl &ni, UnicodeString &dest) :
         impl(ni), str(dest),
         start(NULL), reorderStart(NULL), limit(NULL),
         remainingCapacity(0), lastCC(0) {}
     ~ReorderingBuffer() {
         if(start!=NULL) {
             str.releaseBuffer((int32_t)(limit-start));
         }
     }
     UBool init(int32_t destCapacity, UErrorCode &errorCode);
     UBool isEmpty() const { return start==limit; }
     int32_t length() const { return (int32_t)(limit-start); }
     UChar *getStart() { return start; }
     UChar *getLimit() { return limit; }
     uint8_t getLastCC() const { return lastCC; }
     UBool equals(const UChar *start, const UChar *limit) const;
     // For Hangul composition, replacing the Leading consonant Jamo with the syllable.
     void setLastChar(UChar c) {
         *(limit-1)=c;
     }
     UBool append(UChar32 c, uint8_t cc, UErrorCode &errorCode) {
         return (c<=0xffff) ?
             appendBMP((UChar)c, cc, errorCode) :
             appendSupplementary(c, cc, errorCode);
     }
     // s must be in NFD, otherwise change the implementation.
     UBool append(const UChar *s, int32_t length,
                  uint8_t leadCC, uint8_t trailCC,
                  UErrorCode &errorCode);
     UBool appendBMP(UChar c, uint8_t cc, UErrorCode &errorCode) {
         if(remainingCapacity==0 && !resize(1, errorCode)) {
             return FALSE;
         }
         if(lastCC<=cc || cc==0) {
             *limit++=c;
             lastCC=cc;
             if(cc<=1) {
                 reorderStart=limit;
             }
         } else {
             insert(c, cc);
         }
         --remainingCapacity;
         return TRUE;
     }
     UBool appendZeroCC(UChar32 c, UErrorCode &errorCode);
     UBool appendZeroCC(const UChar *s, const UChar *sLimit, UErrorCode &errorCode);
     void remove();
     void removeSuffix(int32_t suffixLength);
     void setReorderingLimit(UChar *newLimit) {
         remainingCapacity+=(int32_t)(limit-newLimit);
         reorderStart=limit=newLimit;
         lastCC=0;
     }
     void copyReorderableSuffixTo(UnicodeString &s) const {
         s.setTo(reorderStart, (int32_t)(limit-reorderStart));
     }
 private:
     /*
      * TODO: Revisit whether it makes sense to track reorderStart.
      * It is set to after the last known character with cc<=1,
      * which stops previousCC() before it reads that character and looks up its cc.
      * previousCC() is normally only called from insert().
      * In other words, reorderStart speeds up the insertion of a combining mark
      * into a multi-combining mark sequence where it does not belong at the end.
      * This might not be worth the trouble.
      * On the other hand, it's not a huge amount of trouble.
      *
      * We probably need it for UNORM_SIMPLE_APPEND.
      */
     UBool appendSupplementary(UChar32 c, uint8_t cc, UErrorCode &errorCode);
     void insert(UChar32 c, uint8_t cc);
     static void writeCodePoint(UChar *p, UChar32 c) {
         if(c<=0xffff) {
             *p=(UChar)c;
         } else {
             p[0]=U16_LEAD(c);
             p[1]=U16_TRAIL(c);
         }
     }
     UBool resize(int32_t appendLength, UErrorCode &errorCode);
     const Normalizer2Impl &impl;
     UnicodeString &str;
     UChar *start, *reorderStart, *limit;
     int32_t remainingCapacity;
     uint8_t lastCC;
     // private backward iterator
     void setIterator() { codePointStart=limit; }
     void skipPrevious();  // Requires start<codePointStart.
     uint8_t previousCC();  // Returns 0 if there is no previous character.
     UChar *codePointStart, *codePointLimit;
 };
 class U_COMMON_API Normalizer2Impl : public UMemory {
 public:
     Normalizer2Impl() : memory(NULL), normTrie(NULL), fCanonIterData(NULL) {
         fCanonIterDataInitOnce.reset();
     }
     ~Normalizer2Impl();
     void load(const char *packageName, const char *name, UErrorCode &errorCode);
     void addPropertyStarts(const USetAdder *sa, UErrorCode &errorCode) const;
     void addCanonIterPropertyStarts(const USetAdder *sa, UErrorCode &errorCode) const;
     // low-level properties ------------------------------------------------ ***
     const UTrie2 *getNormTrie() const { return normTrie; }
     UBool ensureCanonIterData(UErrorCode &errorCode) const;
     uint16_t getNorm16(UChar32 c) const { return UTRIE2_GET16(normTrie, c); }
     UNormalizationCheckResult getCompQuickCheck(uint16_t norm16) const {
         if(norm16<minNoNo || MIN_YES_YES_WITH_CC<=norm16) {
             return UNORM_YES;
         } else if(minMaybeYes<=norm16) {
             return UNORM_MAYBE;
         } else {
             return UNORM_NO;
         }
     }
     UBool isCompNo(uint16_t norm16) const { return minNoNo<=norm16 && norm16<minMaybeYes; }
     UBool isDecompYes(uint16_t norm16) const { return norm16<minYesNo || minMaybeYes<=norm16; }
     uint8_t getCC(uint16_t norm16) const {
         if(norm16>=MIN_NORMAL_MAYBE_YES) {
             return (uint8_t)norm16;
         }
         if(norm16<minNoNo || limitNoNo<=norm16) {
             return 0;
         }
         return getCCFromNoNo(norm16);
     }
     static uint8_t getCCFromYesOrMaybe(uint16_t norm16) {
         return norm16>=MIN_NORMAL_MAYBE_YES ? (uint8_t)norm16 : 0;
     }
     /**
      * Returns the FCD data for code point c.
      * @param c A Unicode code point.
      * @return The lccc(c) in bits 15..8 and tccc(c) in bits 7..0.
      */
     uint16_t getFCD16(UChar32 c) const {
         if(c<0) {
             return 0;
         } else if(c<0x180) {
             return tccc180[c];
         } else if(c<=0xffff) {
             if(!singleLeadMightHaveNonZeroFCD16(c)) { return 0; }
         }
         return getFCD16FromNormData(c);
     }
     /**
      * Returns the FCD data for the next code point (post-increment).
      * Might skip only a lead surrogate rather than the whole surrogate pair if none of
      * the supplementary code points associated with the lead surrogate have non-zero FCD data.
      * @param s A valid pointer into a string. Requires s!=limit.
      * @param limit The end of the string, or NULL.
      * @return The lccc(c) in bits 15..8 and tccc(c) in bits 7..0.
      */
     uint16_t nextFCD16(const UChar *&s, const UChar *limit) const {
         UChar32 c=*s++;
         if(c<0x180) {
             return tccc180[c];
         } else if(!singleLeadMightHaveNonZeroFCD16(c)) {
             return 0;
         }
         UChar c2;
         if(U16_IS_LEAD(c) && s!=limit && U16_IS_TRAIL(c2=*s)) {
             c=U16_GET_SUPPLEMENTARY(c, c2);
             ++s;
         }
         return getFCD16FromNormData(c);
     }
     /**
      * Returns the FCD data for the previous code point (pre-decrement).
      * @param start The start of the string.
      * @param s A valid pointer into a string. Requires start<s.
      * @return The lccc(c) in bits 15..8 and tccc(c) in bits 7..0.
      */
     uint16_t previousFCD16(const UChar *start, const UChar *&s) const {
         UChar32 c=*--s;
         if(c<0x180) {
             return tccc180[c];
         }
         if(!U16_IS_TRAIL(c)) {
             if(!singleLeadMightHaveNonZeroFCD16(c)) {
                 return 0;
             }
         } else {
             UChar c2;
             if(start<s && U16_IS_LEAD(c2=*(s-1))) {
                 c=U16_GET_SUPPLEMENTARY(c2, c);
                 --s;
             }
         }
         return getFCD16FromNormData(c);
     }
     /** Returns the FCD data for U+0000<=c<U+0180. */
     uint16_t getFCD16FromBelow180(UChar32 c) const { return tccc180[c]; }
     /** Returns TRUE if the single-or-lead code unit c might have non-zero FCD data. */
     UBool singleLeadMightHaveNonZeroFCD16(UChar32 lead) const {
         // 0<=lead<=0xffff
         uint8_t bits=smallFCD[lead>>8];
         if(bits==0) { return false; }
         return (UBool)((bits>>((lead>>5)&7))&1);
     }
     /** Returns the FCD value from the regular normalization data. */
     uint16_t getFCD16FromNormData(UChar32 c) const;
     void makeCanonIterDataFromNorm16(UChar32 start, UChar32 end, uint16_t norm16,
                                      CanonIterData &newData, UErrorCode &errorCode) const;
     /**
      * Gets the decomposition for one code point.
      * @param c code point
      * @param buffer out-only buffer for algorithmic decompositions
      * @param length out-only, takes the length of the decomposition, if any
      * @return pointer to the decomposition, or NULL if none
      */
     const UChar *getDecomposition(UChar32 c, UChar buffer[4], int32_t &length) const;
     /**
      * Gets the raw decomposition for one code point.
      * @param c code point
      * @param buffer out-only buffer for algorithmic decompositions
      * @param length out-only, takes the length of the decomposition, if any
      * @return pointer to the decomposition, or NULL if none
      */
     const UChar *getRawDecomposition(UChar32 c, UChar buffer[30], int32_t &length) const;
     UChar32 composePair(UChar32 a, UChar32 b) const;
     UBool isCanonSegmentStarter(UChar32 c) const;
     UBool getCanonStartSet(UChar32 c, UnicodeSet &set) const;
     enum {
         MIN_CCC_LCCC_CP=0x300
     };
     enum {
         MIN_YES_YES_WITH_CC=0xff01,
         JAMO_VT=0xff00,
         MIN_NORMAL_MAYBE_YES=0xfe00,
         JAMO_L=1,
         MAX_DELTA=0x40
     };
     enum {
         // Byte offsets from the start of the data, after the generic header.
         IX_NORM_TRIE_OFFSET,
         IX_EXTRA_DATA_OFFSET,
         IX_SMALL_FCD_OFFSET,
         IX_RESERVED3_OFFSET,
         IX_RESERVED4_OFFSET,
         IX_RESERVED5_OFFSET,
         IX_RESERVED6_OFFSET,
         IX_TOTAL_SIZE,
         // Code point thresholds for quick check codes.
         IX_MIN_DECOMP_NO_CP,
         IX_MIN_COMP_NO_MAYBE_CP,
         // Norm16 value thresholds for quick check combinations and types of extra data.
         IX_MIN_YES_NO,  // Mappings & compositions in [minYesNo..minYesNoMappingsOnly[.
         IX_MIN_NO_NO,
         IX_LIMIT_NO_NO,
         IX_MIN_MAYBE_YES,
         IX_MIN_YES_NO_MAPPINGS_ONLY,  // Mappings only in [minYesNoMappingsOnly..minNoNo[.
         IX_RESERVED15,
         IX_COUNT
     };
     enum {
         MAPPING_HAS_CCC_LCCC_WORD=0x80,
         MAPPING_HAS_RAW_MAPPING=0x40,
         MAPPING_NO_COMP_BOUNDARY_AFTER=0x20,
         MAPPING_LENGTH_MASK=0x1f
     };
     enum {
         COMP_1_LAST_TUPLE=0x8000,
         COMP_1_TRIPLE=1,
         COMP_1_TRAIL_LIMIT=0x3400,
         COMP_1_TRAIL_MASK=0x7ffe,
         COMP_1_TRAIL_SHIFT=9,  // 10-1 for the "triple" bit
         COMP_2_TRAIL_SHIFT=6,
         COMP_2_TRAIL_MASK=0xffc0
     };
     // higher-level functionality ------------------------------------------ ***
     const UChar *decompose(const UChar *src, const UChar *limit,
                            ReorderingBuffer *buffer, UErrorCode &errorCode) const;
     void decomposeAndAppend(const UChar *src, const UChar *limit,
                             UBool doDecompose,
                             UnicodeString &safeMiddle,
                             ReorderingBuffer &buffer,
                             UErrorCode &errorCode) const;
     UBool compose(const UChar *src, const UChar *limit,
                   UBool onlyContiguous,
                   UBool doCompose,
                   ReorderingBuffer &buffer,
                   UErrorCode &errorCode) const;
     const UChar *composeQuickCheck(const UChar *src, const UChar *limit,
                                    UBool onlyContiguous,
                                    UNormalizationCheckResult *pQCResult) const;
     void composeAndAppend(const UChar *src, const UChar *limit,
                           UBool doCompose,
                           UBool onlyContiguous,
                           UnicodeString &safeMiddle,
                           ReorderingBuffer &buffer,
                           UErrorCode &errorCode) const;
     const UChar *makeFCD(const UChar *src, const UChar *limit,
                          ReorderingBuffer *buffer, UErrorCode &errorCode) const;
     void makeFCDAndAppend(const UChar *src, const UChar *limit,
                           UBool doMakeFCD,
                           UnicodeString &safeMiddle,
                           ReorderingBuffer &buffer,
                           UErrorCode &errorCode) const;
     UBool hasDecompBoundary(UChar32 c, UBool before) const;
     UBool isDecompInert(UChar32 c) const { return isDecompYesAndZeroCC(getNorm16(c)); }
     UBool hasCompBoundaryBefore(UChar32 c) const {
         return c<minCompNoMaybeCP || hasCompBoundaryBefore(c, getNorm16(c));
     }
     UBool hasCompBoundaryAfter(UChar32 c, UBool onlyContiguous, UBool testInert) const;
     UBool hasFCDBoundaryBefore(UChar32 c) const { return c<MIN_CCC_LCCC_CP || getFCD16(c)<=0xff; }
     UBool hasFCDBoundaryAfter(UChar32 c) const {
         uint16_t fcd16=getFCD16(c);
         return fcd16<=1 || (fcd16&0xff)==0;
     }
     UBool isFCDInert(UChar32 c) const { return getFCD16(c)<=1; }
 private:
     static UBool U_CALLCONV
     isAcceptable(void *context, const char *type, const char *name, const UDataInfo *pInfo);
     UBool isMaybe(uint16_t norm16) const { return minMaybeYes<=norm16 && norm16<=JAMO_VT; }
     UBool isMaybeOrNonZeroCC(uint16_t norm16) const { return norm16>=minMaybeYes; }
     static UBool isInert(uint16_t norm16) { return norm16==0; }
     static UBool isJamoL(uint16_t norm16) { return norm16==1; }
     static UBool isJamoVT(uint16_t norm16) { return norm16==JAMO_VT; }
     UBool isHangul(uint16_t norm16) const { return norm16==minYesNo; }
     UBool isCompYesAndZeroCC(uint16_t norm16) const { return norm16<minNoNo; }
     // UBool isCompYes(uint16_t norm16) const {
     //     return norm16>=MIN_YES_YES_WITH_CC || norm16<minNoNo;
     // }
     // UBool isCompYesOrMaybe(uint16_t norm16) const {
     //     return norm16<minNoNo || minMaybeYes<=norm16;
     // }
     // UBool hasZeroCCFromDecompYes(uint16_t norm16) const {
     //     return norm16<=MIN_NORMAL_MAYBE_YES || norm16==JAMO_VT;
     // }
     UBool isDecompYesAndZeroCC(uint16_t norm16) const {
         return norm16<minYesNo ||
                norm16==JAMO_VT ||
                (minMaybeYes<=norm16 && norm16<=MIN_NORMAL_MAYBE_YES);
     }
     /**
      * A little faster and simpler than isDecompYesAndZeroCC() but does not include
      * the MaybeYes which combine-forward and have ccc=0.
      * (Standard Unicode 5.2 normalization does not have such characters.)
      */
     UBool isMostDecompYesAndZeroCC(uint16_t norm16) const {
         return norm16<minYesNo || norm16==MIN_NORMAL_MAYBE_YES || norm16==JAMO_VT;
     }
     UBool isDecompNoAlgorithmic(uint16_t norm16) const { return norm16>=limitNoNo; }
     // For use with isCompYes().
     // Perhaps the compiler can combine the two tests for MIN_YES_YES_WITH_CC.
     // static uint8_t getCCFromYes(uint16_t norm16) {
     //     return norm16>=MIN_YES_YES_WITH_CC ? (uint8_t)norm16 : 0;
     // }
     uint8_t getCCFromNoNo(uint16_t norm16) const {
         const uint16_t *mapping=getMapping(norm16);
         if(*mapping&MAPPING_HAS_CCC_LCCC_WORD) {
             return (uint8_t)*(mapping-1);
         } else {
             return 0;
         }
     }
     // requires that the [cpStart..cpLimit[ character passes isCompYesAndZeroCC()
     uint8_t getTrailCCFromCompYesAndZeroCC(const UChar *cpStart, const UChar *cpLimit) const;
     // Requires algorithmic-NoNo.
     UChar32 mapAlgorithmic(UChar32 c, uint16_t norm16) const {
         return c+norm16-(minMaybeYes-MAX_DELTA-1);
     }
     // Requires minYesNo<norm16<limitNoNo.
     const uint16_t *getMapping(uint16_t norm16) const { return extraData+norm16; }
     const uint16_t *getCompositionsListForDecompYes(uint16_t norm16) const {
         if(norm16==0 || MIN_NORMAL_MAYBE_YES<=norm16) {
             return NULL;
         } else if(norm16<minMaybeYes) {
             return extraData+norm16;  // for yesYes; if Jamo L: harmless empty list
         } else {
             return maybeYesCompositions+norm16-minMaybeYes;
         }
     }
     const uint16_t *getCompositionsListForComposite(uint16_t norm16) const {
         const uint16_t *list=extraData+norm16;  // composite has both mapping & compositions list
         return list+  // mapping pointer
 +  // +1 to skip the first unit with the mapping lenth
             (*list&MAPPING_LENGTH_MASK);  // + mapping length
     }
     /**
      * @param c code point must have compositions
      * @return compositions list pointer
      */
     const uint16_t *getCompositionsList(uint16_t norm16) const {
         return isDecompYes(norm16) ?
                 getCompositionsListForDecompYes(norm16) :
                 getCompositionsListForComposite(norm16);
     }
     const UChar *copyLowPrefixFromNulTerminated(const UChar *src,
                                                 UChar32 minNeedDataCP,
                                                 ReorderingBuffer *buffer,
                                                 UErrorCode &errorCode) const;
     UBool decomposeShort(const UChar *src, const UChar *limit,
                          ReorderingBuffer &buffer, UErrorCode &errorCode) const;
     UBool decompose(UChar32 c, uint16_t norm16,
                     ReorderingBuffer &buffer, UErrorCode &errorCode) const;
     static int32_t combine(const uint16_t *list, UChar32 trail);
     void addComposites(const uint16_t *list, UnicodeSet &set) const;
     void recompose(ReorderingBuffer &buffer, int32_t recomposeStartIndex,
                    UBool onlyContiguous) const;
     UBool hasCompBoundaryBefore(UChar32 c, uint16_t norm16) const;
     const UChar *findPreviousCompBoundary(const UChar *start, const UChar *p) const;
     const UChar *findNextCompBoundary(const UChar *p, const UChar *limit) const;
     const UChar *findPreviousFCDBoundary(const UChar *start, const UChar *p) const;
     const UChar *findNextFCDBoundary(const UChar *p, const UChar *limit) const;
     int32_t getCanonValue(UChar32 c) const;
     const UnicodeSet &getCanonStartSet(int32_t n) const;
     UDataMemory *memory;
     UVersionInfo dataVersion;
     // Code point thresholds for quick check codes.
     UChar32 minDecompNoCP;
     UChar32 minCompNoMaybeCP;
     // Norm16 value thresholds for quick check combinations and types of extra data.
     uint16_t minYesNo;
     uint16_t minYesNoMappingsOnly;
     uint16_t minNoNo;
     uint16_t limitNoNo;
     uint16_t minMaybeYes;
     UTrie2 *normTrie;
     const uint16_t *maybeYesCompositions;
     const uint16_t *extraData;  // mappings and/or compositions for yesYes, yesNo & noNo characters
     const uint8_t *smallFCD;  // [0x100] one bit per 32 BMP code points, set if any FCD!=0
     uint8_t tccc180[0x180];  // tccc values for U+0000..U+017F
   public:           // CanonIterData is public to allow access from C callback functions.
     UInitOnce       fCanonIterDataInitOnce;
     CanonIterData  *fCanonIterData;
 };
 // bits in canonIterData
 #define CANON_NOT_SEGMENT_STARTER 0x80000000
 #define CANON_HAS_COMPOSITIONS 0x40000000
 #define CANON_HAS_SET 0x200000
 #define CANON_VALUE_MASK 0x1fffff
 /**
  * ICU-internal shortcut for quick access to standard Unicode normalization.
  */
 class U_COMMON_API Normalizer2Factory {
 public:
     static const Normalizer2 *getNFCInstance(UErrorCode &errorCode);
     static const Normalizer2 *getNFDInstance(UErrorCode &errorCode);
     static const Normalizer2 *getFCDInstance(UErrorCode &errorCode);
     static const Normalizer2 *getFCCInstance(UErrorCode &errorCode);
     static const Normalizer2 *getNFKCInstance(UErrorCode &errorCode);
     static const Normalizer2 *getNFKDInstance(UErrorCode &errorCode);
     static const Normalizer2 *getNFKC_CFInstance(UErrorCode &errorCode);
     static const Normalizer2 *getNoopInstance(UErrorCode &errorCode);
     static const Normalizer2 *getInstance(UNormalizationMode mode, UErrorCode &errorCode);
     static const Normalizer2Impl *getNFCImpl(UErrorCode &errorCode);
     static const Normalizer2Impl *getNFKCImpl(UErrorCode &errorCode);
     static const Normalizer2Impl *getNFKC_CFImpl(UErrorCode &errorCode);
     // Get the Impl instance of the Normalizer2.
     // Must be used only when it is known that norm2 is a Normalizer2WithImpl instance.
     static const Normalizer2Impl *getImpl(const Normalizer2 *norm2);
 private:
     Normalizer2Factory();  // No instantiation.
 };
 U_NAMESPACE_END
 U_CAPI int32_t U_EXPORT2
 unorm2_swap(const UDataSwapper *ds,
             const void *inData, int32_t length, void *outData,
             UErrorCode *pErrorCode);
 /**
  * Get the NF*_QC property for a code point, for u_getIntPropertyValue().
  * @internal
  */
 U_CFUNC UNormalizationCheckResult
 unorm_getQuickCheck(UChar32 c, UNormalizationMode mode);
 /**
  * Gets the 16-bit FCD value (lead & trail CCs) for a code point, for u_getIntPropertyValue().
  * @internal
  */
 U_CFUNC uint16_t
 unorm_getFCD16(UChar32 c);
 /**
  * Format of Normalizer2 .nrm data files.
  * Format version 2.0.
  *
  * Normalizer2 .nrm data files provide data for the Unicode Normalization algorithms.
  * ICU ships with data files for standard Unicode Normalization Forms
  * NFC and NFD (nfc.nrm), NFKC and NFKD (nfkc.nrm) and NFKC_Casefold (nfkc_cf.nrm).
  * Custom (application-specific) data can be built into additional .nrm files
  * with the gennorm2 build tool.
  *
  * Normalizer2.getInstance() causes a .nrm file to be loaded, unless it has been
  * cached already. Internally, Normalizer2Impl.load() reads the .nrm file.
  *
  * A .nrm file begins with a standard ICU data file header
  * (DataHeader, see ucmndata.h and unicode/udata.h).
  * The UDataInfo.dataVersion field usually contains the Unicode version
  * for which the data was generated.
  *
  * After the header, the file contains the following parts.
  * Constants are defined as enum values of the Normalizer2Impl class.
  *
  * Many details of the data structures are described in the design doc
  * which is at http://site.icu-project.org/design/normalization/custom
  *
  * int32_t indexes[indexesLength]; -- indexesLength=indexes[IX_NORM_TRIE_OFFSET]/4;
  *
  *      The first eight indexes are byte offsets in ascending order.
  *      Each byte offset marks the start of the next part in the data file,
  *      and the end of the previous one.
  *      When two consecutive byte offsets are the same, then the corresponding part is empty.
  *      Byte offsets are offsets from after the header,
  *      that is, from the beginning of the indexes[].
  *      Each part starts at an offset with proper alignment for its data.
  *      If necessary, the previous part may include padding bytes to achieve this alignment.
  *
  *      minDecompNoCP=indexes[IX_MIN_DECOMP_NO_CP] is the lowest code point
  *      with a decomposition mapping, that is, with NF*D_QC=No.
  *      minCompNoMaybeCP=indexes[IX_MIN_COMP_NO_MAYBE_CP] is the lowest code point
  *      with NF*C_QC=No (has a one-way mapping) or Maybe (combines backward).
  *
  *      The next five indexes are thresholds of 16-bit trie values for ranges of
  *      values indicating multiple normalization properties.
  *          minYesNo=indexes[IX_MIN_YES_NO];
  *          minNoNo=indexes[IX_MIN_NO_NO];
  *          limitNoNo=indexes[IX_LIMIT_NO_NO];
  *          minMaybeYes=indexes[IX_MIN_MAYBE_YES];
  *          minYesNoMappingsOnly=indexes[IX_MIN_YES_NO_MAPPINGS_ONLY];
  *      See the normTrie description below and the design doc for details.
  *
  * UTrie2 normTrie; -- see utrie2_impl.h and utrie2.h
  *
  *      The trie holds the main normalization data. Each code point is mapped to a 16-bit value.
  *      Rather than using independent bits in the value (which would require more than 16 bits),
  *      information is extracted primarily via range checks.
  *      For example, a 16-bit value norm16 in the range minYesNo<=norm16<minNoNo
  *      means that the character has NF*C_QC=Yes and NF*D_QC=No properties,
  *      which means it has a two-way (round-trip) decomposition mapping.
  *      Values in the range 2<=norm16<limitNoNo are also directly indexes into the extraData
  *      pointing to mappings, compositions lists, or both.
  *      Value norm16==0 means that the character is normalization-inert, that is,
  *      it does not have a mapping, does not participate in composition, has a zero
  *      canonical combining class, and forms a boundary where text before it and after it
  *      can be normalized independently.
  *      For details about how multiple properties are encoded in 16-bit values
  *      see the design doc.
  *      Note that the encoding cannot express all combinations of the properties involved;
  *      it only supports those combinations that are allowed by
  *      the Unicode Normalization algorithms. Details are in the design doc as well.
  *      The gennorm2 tool only builds .nrm files for data that conforms to the limitations.
  *
  *      The trie has a value for each lead surrogate code unit representing the "worst case"
  *      properties of the 1024 supplementary characters whose UTF-16 form starts with
  *      the lead surrogate. If all of the 1024 supplementary characters are normalization-inert,
  *      then their lead surrogate code unit has the trie value 0.
  *      When the lead surrogate unit's value exceeds the quick check minimum during processing,
  *      the properties for the full supplementary code point need to be looked up.
  *
  * uint16_t maybeYesCompositions[MIN_NORMAL_MAYBE_YES-minMaybeYes];
  * uint16_t extraData[];
  *
  *      There is only one byte offset for the end of these two arrays.
  *      The split between them is given by the constant and variable mentioned above.
  *
  *      The maybeYesCompositions array contains compositions lists for characters that
  *      combine both forward (as starters in composition pairs)
  *      and backward (as trailing characters in composition pairs).
  *      Such characters do not occur in Unicode 5.2 but are allowed by
  *      the Unicode Normalization algorithms.
  *      If there are no such characters, then minMaybeYes==MIN_NORMAL_MAYBE_YES
  *      and the maybeYesCompositions array is empty.
  *      If there are such characters, then minMaybeYes is subtracted from their norm16 values
  *      to get the index into this array.
  *
  *      The extraData array contains compositions lists for "YesYes" characters,
  *      followed by mappings and optional compositions lists for "YesNo" characters,
  *      followed by only mappings for "NoNo" characters.
  *      (Referring to pairs of NFC/NFD quick check values.)
  *      The norm16 values of those characters are directly indexes into the extraData array.
  *
  *      The data structures for compositions lists and mappings are described in the design doc.
  *
  * uint8_t smallFCD[0x100]; -- new in format version 2
  *
  *      This is a bit set to help speed up FCD value lookups in the absence of a full
  *      UTrie2 or other large data structure with the full FCD value mapping.
  *
  *      Each smallFCD bit is set if any of the corresponding 32 BMP code points
  *      has a non-zero FCD value (lccc!=0 or tccc!=0).
  *      Bit 0 of smallFCD[0] is for U+0000..U+001F. Bit 7 of smallFCD[0xff] is for U+FFE0..U+FFFF.
  *      A bit for 32 lead surrogates is set if any of the 32k corresponding
  *      _supplementary_ code points has a non-zero FCD value.
  *
  *      This bit set is most useful for the large blocks of CJK characters with FCD=0.
  *
  * Changes from format version 1 to format version 2 ---------------------------
  *
  * - Addition of data for raw (not recursively decomposed) mappings.
  *   + The MAPPING_NO_COMP_BOUNDARY_AFTER bit in the extraData is now also set when
  *     the mapping is to an empty string or when the character combines-forward.
  *     This subsumes the one actual use of the MAPPING_PLUS_COMPOSITION_LIST bit which
  *     is then repurposed for the MAPPING_HAS_RAW_MAPPING bit.
  *   + For details see the design doc.
  * - Addition of indexes[IX_MIN_YES_NO_MAPPINGS_ONLY] and separation of the yesNo extraData into
  *   distinct ranges (combines-forward vs. not)
  *   so that a range check can be used to find out if there is a compositions list.
  *   This is fully equivalent with formatVersion 1's MAPPING_PLUS_COMPOSITION_LIST flag.
  *   It is needed for the new (in ICU 49) composePair(), not for other normalization.
  * - Addition of the smallFCD[] bit set.
  */
 #endif  /* !UCONFIG_NO_NORMALIZATION */
 #endif  /* __NORMALIZER2IMPL_H__ */

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