Add implementation

1 files changed, 953 insertions, 0 deletions

diff --git a/libicuuc/libicu/ucasemap.cpp b/libicuuc/libicu/ucasemap.cpp
new file mode 100644
index 0000000..529566c
--- /dev/null
+++ b/libicuuc/libicu/ucasemap.cpp
@@ -0,0 +1,953 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+*   Copyright (C) 2005-2016, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  ucasemap.cpp
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2005may06
+*   created by: Markus W. Scherer
+*
+*   Case mapping service object and functions using it.
+*/
+
+#include "unicode/utypes.h"
+#include "unicode/brkiter.h"
+#include "unicode/bytestream.h"
+#include "unicode/casemap.h"
+#include "unicode/edits.h"
+#include "unicode/stringoptions.h"
+#include "unicode/stringpiece.h"
+#include "unicode/ubrk.h"
+#include "unicode/uloc.h"
+#include "unicode/ustring.h"
+#include "unicode/ucasemap.h"
+#if !UCONFIG_NO_BREAK_ITERATION
+#include "unicode/utext.h"
+#endif
+#include "unicode/utf.h"
+#include "unicode/utf8.h"
+#include "unicode/utf16.h"
+#include "bytesinkutil.h"
+#include "cmemory.h"
+#include "cstring.h"
+#include "uassert.h"
+#include "ucase.h"
+#include "ucasemap_imp.h"
+#include "ustr_imp.h"
+
+U_NAMESPACE_USE
+
+/* UCaseMap service object -------------------------------------------------- */
+
+UCaseMap::UCaseMap(const char *localeID, uint32_t opts, UErrorCode *pErrorCode) :
+#if !UCONFIG_NO_BREAK_ITERATION
+        iter(NULL),
+#endif
+        caseLocale(UCASE_LOC_UNKNOWN), options(opts) {
+    ucasemap_setLocale(this, localeID, pErrorCode);
+}
+
+UCaseMap::~UCaseMap() {
+#if !UCONFIG_NO_BREAK_ITERATION
+    delete iter;
+#endif
+}
+
+U_CAPI UCaseMap * U_EXPORT2
+ucasemap_open(const char *locale, uint32_t options, UErrorCode *pErrorCode) {
+    if(U_FAILURE(*pErrorCode)) {
+        return NULL;
+    }
+    UCaseMap *csm = new UCaseMap(locale, options, pErrorCode);
+    if(csm==NULL) {
+        *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
+        return NULL;
+    } else if (U_FAILURE(*pErrorCode)) {
+        delete csm;
+        return NULL;
+    }
+    return csm;
+}
+
+U_CAPI void U_EXPORT2
+ucasemap_close(UCaseMap *csm) {
+    delete csm;
+}
+
+U_CAPI const char * U_EXPORT2
+ucasemap_getLocale(const UCaseMap *csm) {
+    return csm->locale;
+}
+
+U_CAPI uint32_t U_EXPORT2
+ucasemap_getOptions(const UCaseMap *csm) {
+    return csm->options;
+}
+
+U_CAPI void U_EXPORT2
+ucasemap_setLocale(UCaseMap *csm, const char *locale, UErrorCode *pErrorCode) {
+    if(U_FAILURE(*pErrorCode)) {
+        return;
+    }
+    if (locale != NULL && *locale == 0) {
+        csm->locale[0] = 0;
+        csm->caseLocale = UCASE_LOC_ROOT;
+        return;
+    }
+
+    int32_t length=uloc_getName(locale, csm->locale, (int32_t)sizeof(csm->locale), pErrorCode);
+    if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR || length==sizeof(csm->locale)) {
+        *pErrorCode=U_ZERO_ERROR;
+        /* we only really need the language code for case mappings */
+        length=uloc_getLanguage(locale, csm->locale, (int32_t)sizeof(csm->locale), pErrorCode);
+    }
+    if(length==sizeof(csm->locale)) {
+        *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
+    }
+    if(U_SUCCESS(*pErrorCode)) {
+        csm->caseLocale=UCASE_LOC_UNKNOWN;
+        csm->caseLocale = ucase_getCaseLocale(csm->locale);
+    } else {
+        csm->locale[0]=0;
+        csm->caseLocale = UCASE_LOC_ROOT;
+    }
+}
+
+U_CAPI void U_EXPORT2
+ucasemap_setOptions(UCaseMap *csm, uint32_t options, UErrorCode *pErrorCode) {
+    if(U_FAILURE(*pErrorCode)) {
+        return;
+    }
+    csm->options=options;
+}
+
+/* UTF-8 string case mappings ----------------------------------------------- */
+
+/* TODO(markus): Move to a new, separate utf8case.cpp file. */
+
+namespace {
+
+/* append a full case mapping result, see UCASE_MAX_STRING_LENGTH */
+inline UBool
+appendResult(int32_t cpLength, int32_t result, const UChar *s,
+             ByteSink &sink, uint32_t options, icu::Edits *edits, UErrorCode &errorCode) {
+    U_ASSERT(U_SUCCESS(errorCode));
+
+    /* decode the result */
+    if(result<0) {
+        /* (not) original code point */
+        if(edits!=NULL) {
+            edits->addUnchanged(cpLength);
+        }
+        if((options & U_OMIT_UNCHANGED_TEXT) == 0) {
+            ByteSinkUtil::appendCodePoint(cpLength, ~result, sink);
+        }
+    } else {
+        if(result<=UCASE_MAX_STRING_LENGTH) {
+            // string: "result" is the UTF-16 length
+            return ByteSinkUtil::appendChange(cpLength, s, result, sink, edits, errorCode);
+        } else {
+            ByteSinkUtil::appendCodePoint(cpLength, result, sink, edits);
+        }
+    }
+    return TRUE;
+}
+
+// See unicode/utf8.h U8_APPEND_UNSAFE().
+inline uint8_t getTwoByteLead(UChar32 c) { return (uint8_t)((c >> 6) | 0xc0); }
+inline uint8_t getTwoByteTrail(UChar32 c) { return (uint8_t)((c & 0x3f) | 0x80); }
+
+UChar32 U_CALLCONV
+utf8_caseContextIterator(void *context, int8_t dir) {
+    UCaseContext *csc=(UCaseContext *)context;
+    UChar32 c;
+
+    if(dir<0) {
+        /* reset for backward iteration */
+        csc->index=csc->cpStart;
+        csc->dir=dir;
+    } else if(dir>0) {
+        /* reset for forward iteration */
+        csc->index=csc->cpLimit;
+        csc->dir=dir;
+    } else {
+        /* continue current iteration direction */
+        dir=csc->dir;
+    }
+
+    if(dir<0) {
+        if(csc->start<csc->index) {
+            U8_PREV((const uint8_t *)csc->p, csc->start, csc->index, c);
+            return c;
+        }
+    } else {
+        if(csc->index<csc->limit) {
+            U8_NEXT((const uint8_t *)csc->p, csc->index, csc->limit, c);
+            return c;
+        }
+    }
+    return U_SENTINEL;
+}
+
+/**
+ * caseLocale >= 0: Lowercases [srcStart..srcLimit[ but takes context [0..srcLength[ into account.
+ * caseLocale < 0: Case-folds [srcStart..srcLimit[.
+ */
+void toLower(int32_t caseLocale, uint32_t options,
+             const uint8_t *src, UCaseContext *csc, int32_t srcStart, int32_t srcLimit,
+             icu::ByteSink &sink, icu::Edits *edits, UErrorCode &errorCode) {
+    const int8_t *latinToLower;
+    if (caseLocale == UCASE_LOC_ROOT ||
+            (caseLocale >= 0 ?
+                !(caseLocale == UCASE_LOC_TURKISH || caseLocale == UCASE_LOC_LITHUANIAN) :
+                (options & _FOLD_CASE_OPTIONS_MASK) == U_FOLD_CASE_DEFAULT)) {
+        latinToLower = LatinCase::TO_LOWER_NORMAL;
+    } else {
+        latinToLower = LatinCase::TO_LOWER_TR_LT;
+    }
+    const UTrie2 *trie = ucase_getTrie();
+    int32_t prev = srcStart;
+    int32_t srcIndex = srcStart;
+    for (;;) {
+        // fast path for simple cases
+        int32_t cpStart;
+        UChar32 c;
+        for (;;) {
+            if (U_FAILURE(errorCode) || srcIndex >= srcLimit) {
+                c = U_SENTINEL;
+                break;
+            }
+            uint8_t lead = src[srcIndex++];
+            if (lead <= 0x7f) {
+                int8_t d = latinToLower[lead];
+                if (d == LatinCase::EXC) {
+                    cpStart = srcIndex - 1;
+                    c = lead;
+                    break;
+                }
+                if (d == 0) { continue; }
+                ByteSinkUtil::appendUnchanged(src + prev, srcIndex - 1 - prev,
+                                              sink, options, edits, errorCode);
+                char ascii = (char)(lead + d);
+                sink.Append(&ascii, 1);
+                if (edits != nullptr) {
+                    edits->addReplace(1, 1);
+                }
+                prev = srcIndex;
+                continue;
+            } else if (lead < 0xe3) {
+                uint8_t t;
+                if (0xc2 <= lead && lead <= 0xc5 && srcIndex < srcLimit &&
+                        (t = src[srcIndex] - 0x80) <= 0x3f) {
+                    // U+0080..U+017F
+                    ++srcIndex;
+                    c = ((lead - 0xc0) << 6) | t;
+                    int8_t d = latinToLower[c];
+                    if (d == LatinCase::EXC) {
+                        cpStart = srcIndex - 2;
+                        break;
+                    }
+                    if (d == 0) { continue; }
+                    ByteSinkUtil::appendUnchanged(src + prev, srcIndex - 2 - prev,
+                                                  sink, options, edits, errorCode);
+                    ByteSinkUtil::appendTwoBytes(c + d, sink);
+                    if (edits != nullptr) {
+                        edits->addReplace(2, 2);
+                    }
+                    prev = srcIndex;
+                    continue;
+                }
+            } else if ((lead <= 0xe9 || lead == 0xeb || lead == 0xec) &&
+                    (srcIndex + 2) <= srcLimit &&
+                    U8_IS_TRAIL(src[srcIndex]) && U8_IS_TRAIL(src[srcIndex + 1])) {
+                // most of CJK: no case mappings
+                srcIndex += 2;
+                continue;
+            }
+            cpStart = --srcIndex;
+            U8_NEXT(src, srcIndex, srcLimit, c);
+            if (c < 0) {
+                // ill-formed UTF-8
+                continue;
+            }
+            uint16_t props = UTRIE2_GET16(trie, c);
+            if (UCASE_HAS_EXCEPTION(props)) { break; }
+            int32_t delta;
+            if (!UCASE_IS_UPPER_OR_TITLE(props) || (delta = UCASE_GET_DELTA(props)) == 0) {
+                continue;
+            }
+            ByteSinkUtil::appendUnchanged(src + prev, cpStart - prev,
+                                          sink, options, edits, errorCode);
+            ByteSinkUtil::appendCodePoint(srcIndex - cpStart, c + delta, sink, edits);
+            prev = srcIndex;
+        }
+        if (c < 0) {
+            break;
+        }
+        // slow path
+        const UChar *s;
+        if (caseLocale >= 0) {
+            csc->cpStart = cpStart;
+            csc->cpLimit = srcIndex;
+            c = ucase_toFullLower(c, utf8_caseContextIterator, csc, &s, caseLocale);
+        } else {
+            c = ucase_toFullFolding(c, &s, options);
+        }
+        if (c >= 0) {
+            ByteSinkUtil::appendUnchanged(src + prev, cpStart - prev,
+                                          sink, options, edits, errorCode);
+            appendResult(srcIndex - cpStart, c, s, sink, options, edits, errorCode);
+            prev = srcIndex;
+        }
+    }
+    ByteSinkUtil::appendUnchanged(src + prev, srcIndex - prev,
+                                  sink, options, edits, errorCode);
+}
+
+void toUpper(int32_t caseLocale, uint32_t options,
+             const uint8_t *src, UCaseContext *csc, int32_t srcLength,
+             icu::ByteSink &sink, icu::Edits *edits, UErrorCode &errorCode) {
+    const int8_t *latinToUpper;
+    if (caseLocale == UCASE_LOC_TURKISH) {
+        latinToUpper = LatinCase::TO_UPPER_TR;
+    } else {
+        latinToUpper = LatinCase::TO_UPPER_NORMAL;
+    }
+    const UTrie2 *trie = ucase_getTrie();
+    int32_t prev = 0;
+    int32_t srcIndex = 0;
+    for (;;) {
+        // fast path for simple cases
+        int32_t cpStart;
+        UChar32 c;
+        for (;;) {
+            if (U_FAILURE(errorCode) || srcIndex >= srcLength) {
+                c = U_SENTINEL;
+                break;
+            }
+            uint8_t lead = src[srcIndex++];
+            if (lead <= 0x7f) {
+                int8_t d = latinToUpper[lead];
+                if (d == LatinCase::EXC) {
+                    cpStart = srcIndex - 1;
+                    c = lead;
+                    break;
+                }
+                if (d == 0) { continue; }
+                ByteSinkUtil::appendUnchanged(src + prev, srcIndex - 1 - prev,
+                                              sink, options, edits, errorCode);
+                char ascii = (char)(lead + d);
+                sink.Append(&ascii, 1);
+                if (edits != nullptr) {
+                    edits->addReplace(1, 1);
+                }
+                prev = srcIndex;
+                continue;
+            } else if (lead < 0xe3) {
+                uint8_t t;
+                if (0xc2 <= lead && lead <= 0xc5 && srcIndex < srcLength &&
+                        (t = src[srcIndex] - 0x80) <= 0x3f) {
+                    // U+0080..U+017F
+                    ++srcIndex;
+                    c = ((lead - 0xc0) << 6) | t;
+                    int8_t d = latinToUpper[c];
+                    if (d == LatinCase::EXC) {
+                        cpStart = srcIndex - 2;
+                        break;
+                    }
+                    if (d == 0) { continue; }
+                    ByteSinkUtil::appendUnchanged(src + prev, srcIndex - 2 - prev,
+                                                  sink, options, edits, errorCode);
+                    ByteSinkUtil::appendTwoBytes(c + d, sink);
+                    if (edits != nullptr) {
+                        edits->addReplace(2, 2);
+                    }
+                    prev = srcIndex;
+                    continue;
+                }
+            } else if ((lead <= 0xe9 || lead == 0xeb || lead == 0xec) &&
+                    (srcIndex + 2) <= srcLength &&
+                    U8_IS_TRAIL(src[srcIndex]) && U8_IS_TRAIL(src[srcIndex + 1])) {
+                // most of CJK: no case mappings
+                srcIndex += 2;
+                continue;
+            }
+            cpStart = --srcIndex;
+            U8_NEXT(src, srcIndex, srcLength, c);
+            if (c < 0) {
+                // ill-formed UTF-8
+                continue;
+            }
+            uint16_t props = UTRIE2_GET16(trie, c);
+            if (UCASE_HAS_EXCEPTION(props)) { break; }
+            int32_t delta;
+            if (UCASE_GET_TYPE(props) != UCASE_LOWER || (delta = UCASE_GET_DELTA(props)) == 0) {
+                continue;
+            }
+            ByteSinkUtil::appendUnchanged(src + prev, cpStart - prev,
+                                          sink, options, edits, errorCode);
+            ByteSinkUtil::appendCodePoint(srcIndex - cpStart, c + delta, sink, edits);
+            prev = srcIndex;
+        }
+        if (c < 0) {
+            break;
+        }
+        // slow path
+        csc->cpStart = cpStart;
+        csc->cpLimit = srcIndex;
+        const UChar *s;
+        c = ucase_toFullUpper(c, utf8_caseContextIterator, csc, &s, caseLocale);
+        if (c >= 0) {
+            ByteSinkUtil::appendUnchanged(src + prev, cpStart - prev,
+                                          sink, options, edits, errorCode);
+            appendResult(srcIndex - cpStart, c, s, sink, options, edits, errorCode);
+            prev = srcIndex;
+        }
+    }
+    ByteSinkUtil::appendUnchanged(src + prev, srcIndex - prev,
+                                  sink, options, edits, errorCode);
+}
+
+}  // namespace
+
+#if !UCONFIG_NO_BREAK_ITERATION
+
+U_CFUNC void U_CALLCONV
+ucasemap_internalUTF8ToTitle(
+        int32_t caseLocale, uint32_t options, BreakIterator *iter,
+        const uint8_t *src, int32_t srcLength,
+        ByteSink &sink, icu::Edits *edits,
+        UErrorCode &errorCode) {
+    if (!ustrcase_checkTitleAdjustmentOptions(options, errorCode)) {
+        return;
+    }
+
+    /* set up local variables */
+    UCaseContext csc=UCASECONTEXT_INITIALIZER;
+    csc.p=(void *)src;
+    csc.limit=srcLength;
+    int32_t prev=0;
+    UBool isFirstIndex=TRUE;
+
+    /* titlecasing loop */
+    while(prev<srcLength) {
+        /* find next index where to titlecase */
+        int32_t index;
+        if(isFirstIndex) {
+            isFirstIndex=FALSE;
+            index=iter->first();
+        } else {
+            index=iter->next();
+        }
+        if(index==UBRK_DONE || index>srcLength) {
+            index=srcLength;
+        }
+
+        /*
+         * Segment [prev..index[ into 3 parts:
+         * a) skipped characters (copy as-is) [prev..titleStart[
+         * b) first letter (titlecase)              [titleStart..titleLimit[
+         * c) subsequent characters (lowercase)                 [titleLimit..index[
+         */
+        if(prev<index) {
+            /* find and copy skipped characters [prev..titleStart[ */
+            int32_t titleStart=prev;
+            int32_t titleLimit=prev;
+            UChar32 c;
+            U8_NEXT(src, titleLimit, index, c);
+            if ((options&U_TITLECASE_NO_BREAK_ADJUSTMENT)==0) {
+                // Adjust the titlecasing index to the next cased character,
+                // or to the next letter/number/symbol/private use.
+                // Stop with titleStart<titleLimit<=index
+                // if there is a character to be titlecased,
+                // or else stop with titleStart==titleLimit==index.
+                UBool toCased = (options&U_TITLECASE_ADJUST_TO_CASED) != 0;
+                while (toCased ? UCASE_NONE==ucase_getType(c) : !ustrcase_isLNS(c)) {
+                    titleStart=titleLimit;
+                    if(titleLimit==index) {
+                        break;
+                    }
+                    U8_NEXT(src, titleLimit, index, c);
+                }
+                if (prev < titleStart) {
+                    if (!ByteSinkUtil::appendUnchanged(src+prev, titleStart-prev,
+                                                       sink, options, edits, errorCode)) {
+                        return;
+                    }
+                }
+            }
+
+            if(titleStart<titleLimit) {
+                /* titlecase c which is from [titleStart..titleLimit[ */
+                if(c>=0) {
+                    csc.cpStart=titleStart;
+                    csc.cpLimit=titleLimit;
+                    const UChar *s;
+                    c=ucase_toFullTitle(c, utf8_caseContextIterator, &csc, &s, caseLocale);
+                    if (!appendResult(titleLimit-titleStart, c, s, sink, options, edits, errorCode)) {
+                        return;
+                    }
+                } else {
+                    // Malformed UTF-8.
+                    if (!ByteSinkUtil::appendUnchanged(src+titleStart, titleLimit-titleStart,
+                                                       sink, options, edits, errorCode)) {
+                        return;
+                    }
+                }
+
+                /* Special case Dutch IJ titlecasing */
+                if (titleStart+1 < index &&
+                        caseLocale == UCASE_LOC_DUTCH &&
+                        (src[titleStart] == 0x0049 || src[titleStart] == 0x0069)) {
+                    if (src[titleStart+1] == 0x006A) {
+                        ByteSinkUtil::appendCodePoint(1, 0x004A, sink, edits);
+                        titleLimit++;
+                    } else if (src[titleStart+1] == 0x004A) {
+                        // Keep the capital J from getting lowercased.
+                        if (!ByteSinkUtil::appendUnchanged(src+titleStart+1, 1,
+                                                           sink, options, edits, errorCode)) {
+                            return;
+                        }
+                        titleLimit++;
+                    }
+                }
+
+                /* lowercase [titleLimit..index[ */
+                if(titleLimit<index) {
+                    if((options&U_TITLECASE_NO_LOWERCASE)==0) {
+                        /* Normal operation: Lowercase the rest of the word. */
+                        toLower(caseLocale, options,
+                                src, &csc, titleLimit, index,
+                                sink, edits, errorCode);
+                        if(U_FAILURE(errorCode)) {
+                            return;
+                        }
+                    } else {
+                        /* Optionally just copy the rest of the word unchanged. */
+                        if (!ByteSinkUtil::appendUnchanged(src+titleLimit, index-titleLimit,
+                                                           sink, options, edits, errorCode)) {
+                            return;
+                        }
+                    }
+                }
+            }
+        }
+
+        prev=index;
+    }
+}
+
+#endif
+
+U_NAMESPACE_BEGIN
+namespace GreekUpper {
+
+UBool isFollowedByCasedLetter(const uint8_t *s, int32_t i, int32_t length) {
+    while (i < length) {
+        UChar32 c;
+        U8_NEXT(s, i, length, c);
+        int32_t type = ucase_getTypeOrIgnorable(c);
+        if ((type & UCASE_IGNORABLE) != 0) {
+            // Case-ignorable, continue with the loop.
+        } else if (type != UCASE_NONE) {
+            return TRUE;  // Followed by cased letter.
+        } else {
+            return FALSE;  // Uncased and not case-ignorable.
+        }
+    }
+    return FALSE;  // Not followed by cased letter.
+}
+
+// Keep this consistent with the UTF-16 version in ustrcase.cpp and the Java version in CaseMap.java.
+void toUpper(uint32_t options,
+             const uint8_t *src, int32_t srcLength,
+             ByteSink &sink, Edits *edits,
+             UErrorCode &errorCode) {
+    uint32_t state = 0;
+    for (int32_t i = 0; i < srcLength;) {
+        int32_t nextIndex = i;
+        UChar32 c;
+        U8_NEXT(src, nextIndex, srcLength, c);
+        uint32_t nextState = 0;
+        int32_t type = ucase_getTypeOrIgnorable(c);
+        if ((type & UCASE_IGNORABLE) != 0) {
+            // c is case-ignorable
+            nextState |= (state & AFTER_CASED);
+        } else if (type != UCASE_NONE) {
+            // c is cased
+            nextState |= AFTER_CASED;
+        }
+        uint32_t data = getLetterData(c);
+        if (data > 0) {
+            uint32_t upper = data & UPPER_MASK;
+            // Add a dialytika to this iota or ypsilon vowel
+            // if we removed a tonos from the previous vowel,
+            // and that previous vowel did not also have (or gain) a dialytika.
+            // Adding one only to the final vowel in a longer sequence
+            // (which does not occur in normal writing) would require lookahead.
+            // Set the same flag as for preserving an existing dialytika.
+            if ((data & HAS_VOWEL) != 0 && (state & AFTER_VOWEL_WITH_ACCENT) != 0 &&
+                    (upper == 0x399 || upper == 0x3A5)) {
+                data |= HAS_DIALYTIKA;
+            }
+            int32_t numYpogegrammeni = 0;  // Map each one to a trailing, spacing, capital iota.
+            if ((data & HAS_YPOGEGRAMMENI) != 0) {
+                numYpogegrammeni = 1;
+            }
+            // Skip combining diacritics after this Greek letter.
+            int32_t nextNextIndex = nextIndex;
+            while (nextIndex < srcLength) {
+                UChar32 c2;
+                U8_NEXT(src, nextNextIndex, srcLength, c2);
+                uint32_t diacriticData = getDiacriticData(c2);
+                if (diacriticData != 0) {
+                    data |= diacriticData;
+                    if ((diacriticData & HAS_YPOGEGRAMMENI) != 0) {
+                        ++numYpogegrammeni;
+                    }
+                    nextIndex = nextNextIndex;
+                } else {
+                    break;  // not a Greek diacritic
+                }
+            }
+            if ((data & HAS_VOWEL_AND_ACCENT_AND_DIALYTIKA) == HAS_VOWEL_AND_ACCENT) {
+                nextState |= AFTER_VOWEL_WITH_ACCENT;
+            }
+            // Map according to Greek rules.
+            UBool addTonos = FALSE;
+            if (upper == 0x397 &&
+                    (data & HAS_ACCENT) != 0 &&
+                    numYpogegrammeni == 0 &&
+                    (state & AFTER_CASED) == 0 &&
+                    !isFollowedByCasedLetter(src, nextIndex, srcLength)) {
+                // Keep disjunctive "or" with (only) a tonos.
+                // We use the same "word boundary" conditions as for the Final_Sigma test.
+                if (i == nextIndex) {
+                    upper = 0x389;  // Preserve the precomposed form.
+                } else {
+                    addTonos = TRUE;
+                }
+            } else if ((data & HAS_DIALYTIKA) != 0) {
+                // Preserve a vowel with dialytika in precomposed form if it exists.
+                if (upper == 0x399) {
+                    upper = 0x3AA;
+                    data &= ~HAS_EITHER_DIALYTIKA;
+                } else if (upper == 0x3A5) {
+                    upper = 0x3AB;
+                    data &= ~HAS_EITHER_DIALYTIKA;
+                }
+            }
+
+            UBool change;
+            if (edits == nullptr && (options & U_OMIT_UNCHANGED_TEXT) == 0) {
+                change = TRUE;  // common, simple usage
+            } else {
+                // Find out first whether we are changing the text.
+                U_ASSERT(0x370 <= upper && upper <= 0x3ff);  // 2-byte UTF-8, main Greek block
+                change = (i + 2) > nextIndex ||
+                        src[i] != getTwoByteLead(upper) || src[i + 1] != getTwoByteTrail(upper) ||
+                        numYpogegrammeni > 0;
+                int32_t i2 = i + 2;
+                if ((data & HAS_EITHER_DIALYTIKA) != 0) {
+                    change |= (i2 + 2) > nextIndex ||
+                            src[i2] != (uint8_t)u8"\u0308"[0] ||
+                            src[i2 + 1] != (uint8_t)u8"\u0308"[1];
+                    i2 += 2;
+                }
+                if (addTonos) {
+                    change |= (i2 + 2) > nextIndex ||
+                            src[i2] != (uint8_t)u8"\u0301"[0] ||
+                            src[i2 + 1] != (uint8_t)u8"\u0301"[1];
+                    i2 += 2;
+                }
+                int32_t oldLength = nextIndex - i;
+                int32_t newLength = (i2 - i) + numYpogegrammeni * 2;  // 2 bytes per U+0399
+                change |= oldLength != newLength;
+                if (change) {
+                    if (edits != NULL) {
+                        edits->addReplace(oldLength, newLength);
+                    }
+                } else {
+                    if (edits != NULL) {
+                        edits->addUnchanged(oldLength);
+                    }
+                    // Write unchanged text?
+                    change = (options & U_OMIT_UNCHANGED_TEXT) == 0;
+                }
+            }
+
+            if (change) {
+                ByteSinkUtil::appendTwoBytes(upper, sink);
+                if ((data & HAS_EITHER_DIALYTIKA) != 0) {
+                    sink.Append("\u0308", 2);  // restore or add a dialytika
+                }
+                if (addTonos) {
+                    sink.Append("\u0301", 2);
+                }
+                while (numYpogegrammeni > 0) {
+                    sink.Append("\u0399", 2);
+                    --numYpogegrammeni;
+                }
+            }
+        } else if(c>=0) {
+            const UChar *s;
+            c=ucase_toFullUpper(c, NULL, NULL, &s, UCASE_LOC_GREEK);
+            if (!appendResult(nextIndex - i, c, s, sink, options, edits, errorCode)) {
+                return;
+            }
+        } else {
+            // Malformed UTF-8.
+            if (!ByteSinkUtil::appendUnchanged(src+i, nextIndex-i,
+                                               sink, options, edits, errorCode)) {
+                return;
+            }
+        }
+        i = nextIndex;
+        state = nextState;
+    }
+}
+
+}  // namespace GreekUpper
+U_NAMESPACE_END
+
+static void U_CALLCONV
+ucasemap_internalUTF8ToLower(int32_t caseLocale, uint32_t options, UCASEMAP_BREAK_ITERATOR_UNUSED
+                             const uint8_t *src, int32_t srcLength,
+                             icu::ByteSink &sink, icu::Edits *edits,
+                             UErrorCode &errorCode) {
+    UCaseContext csc=UCASECONTEXT_INITIALIZER;
+    csc.p=(void *)src;
+    csc.limit=srcLength;
+    toLower(
+        caseLocale, options,
+        src, &csc, 0, srcLength,
+        sink, edits, errorCode);
+}
+
+static void U_CALLCONV
+ucasemap_internalUTF8ToUpper(int32_t caseLocale, uint32_t options, UCASEMAP_BREAK_ITERATOR_UNUSED
+                             const uint8_t *src, int32_t srcLength,
+                             icu::ByteSink &sink, icu::Edits *edits,
+                             UErrorCode &errorCode) {
+    if (caseLocale == UCASE_LOC_GREEK) {
+        GreekUpper::toUpper(options, src, srcLength, sink, edits, errorCode);
+    } else {
+        UCaseContext csc=UCASECONTEXT_INITIALIZER;
+        csc.p=(void *)src;
+        csc.limit=srcLength;
+        toUpper(
+            caseLocale, options,
+            src, &csc, srcLength,
+            sink, edits, errorCode);
+    }
+}
+
+static void U_CALLCONV
+ucasemap_internalUTF8Fold(int32_t /* caseLocale */, uint32_t options, UCASEMAP_BREAK_ITERATOR_UNUSED
+                          const uint8_t *src, int32_t srcLength,
+                          icu::ByteSink &sink, icu::Edits *edits,
+                          UErrorCode &errorCode) {
+    toLower(
+        -1, options,
+        src, nullptr, 0, srcLength,
+        sink, edits, errorCode);
+}
+
+void
+ucasemap_mapUTF8(int32_t caseLocale, uint32_t options, UCASEMAP_BREAK_ITERATOR_PARAM
+                 const char *src, int32_t srcLength,
+                 UTF8CaseMapper *stringCaseMapper,
+                 icu::ByteSink &sink, icu::Edits *edits,
+                 UErrorCode &errorCode) {
+    /* check argument values */
+    if (U_FAILURE(errorCode)) {
+        return;
+    }
+    if ((src == nullptr && srcLength != 0) || srcLength < -1) {
+        errorCode = U_ILLEGAL_ARGUMENT_ERROR;
+        return;
+    }
+
+    // Get the string length.
+    if (srcLength == -1) {
+        srcLength = (int32_t)uprv_strlen((const char *)src);
+    }
+
+    if (edits != nullptr && (options & U_EDITS_NO_RESET) == 0) {
+        edits->reset();
+    }
+    stringCaseMapper(caseLocale, options, UCASEMAP_BREAK_ITERATOR
+                     (const uint8_t *)src, srcLength, sink, edits, errorCode);
+    sink.Flush();
+    if (U_SUCCESS(errorCode)) {
+        if (edits != nullptr) {
+            edits->copyErrorTo(errorCode);
+        }
+    }
+}
+
+int32_t
+ucasemap_mapUTF8(int32_t caseLocale, uint32_t options, UCASEMAP_BREAK_ITERATOR_PARAM
+                 char *dest, int32_t destCapacity,
+                 const char *src, int32_t srcLength,
+                 UTF8CaseMapper *stringCaseMapper,
+                 icu::Edits *edits,
+                 UErrorCode &errorCode) {
+    /* check argument values */
+    if(U_FAILURE(errorCode)) {
+        return 0;
+    }
+    if( destCapacity<0 ||
+        (dest==NULL && destCapacity>0) ||
+        (src==NULL && srcLength!=0) || srcLength<-1
+    ) {
+        errorCode=U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+
+    /* get the string length */
+    if(srcLength==-1) {
+        srcLength=(int32_t)uprv_strlen((const char *)src);
+    }
+
+    /* check for overlapping source and destination */
+    if( dest!=NULL &&
+        ((src>=dest && src<(dest+destCapacity)) ||
+         (dest>=src && dest<(src+srcLength)))
+    ) {
+        errorCode=U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+
+    CheckedArrayByteSink sink(dest, destCapacity);
+    if (edits != nullptr && (options & U_EDITS_NO_RESET) == 0) {
+        edits->reset();
+    }
+    stringCaseMapper(caseLocale, options, UCASEMAP_BREAK_ITERATOR
+                     (const uint8_t *)src, srcLength, sink, edits, errorCode);
+    sink.Flush();
+    if (U_SUCCESS(errorCode)) {
+        if (sink.Overflowed()) {
+            errorCode = U_BUFFER_OVERFLOW_ERROR;
+        } else if (edits != nullptr) {
+            edits->copyErrorTo(errorCode);
+        }
+    }
+    return u_terminateChars(dest, destCapacity, sink.NumberOfBytesAppended(), &errorCode);
+}
+
+/* public API functions */
+
+U_CAPI int32_t U_EXPORT2
+ucasemap_utf8ToLower(const UCaseMap *csm,
+                     char *dest, int32_t destCapacity,
+                     const char *src, int32_t srcLength,
+                     UErrorCode *pErrorCode) {
+    return ucasemap_mapUTF8(
+        csm->caseLocale, csm->options, UCASEMAP_BREAK_ITERATOR_NULL
+        dest, destCapacity,
+        src, srcLength,
+        ucasemap_internalUTF8ToLower, NULL, *pErrorCode);
+}
+
+U_CAPI int32_t U_EXPORT2
+ucasemap_utf8ToUpper(const UCaseMap *csm,
+                     char *dest, int32_t destCapacity,
+                     const char *src, int32_t srcLength,
+                     UErrorCode *pErrorCode) {
+    return ucasemap_mapUTF8(
+        csm->caseLocale, csm->options, UCASEMAP_BREAK_ITERATOR_NULL
+        dest, destCapacity,
+        src, srcLength,
+        ucasemap_internalUTF8ToUpper, NULL, *pErrorCode);
+}
+
+U_CAPI int32_t U_EXPORT2
+ucasemap_utf8FoldCase(const UCaseMap *csm,
+                      char *dest, int32_t destCapacity,
+                      const char *src, int32_t srcLength,
+                      UErrorCode *pErrorCode) {
+    return ucasemap_mapUTF8(
+        UCASE_LOC_ROOT, csm->options, UCASEMAP_BREAK_ITERATOR_NULL
+        dest, destCapacity,
+        src, srcLength,
+        ucasemap_internalUTF8Fold, NULL, *pErrorCode);
+}
+
+U_NAMESPACE_BEGIN
+
+void CaseMap::utf8ToLower(
+        const char *locale, uint32_t options,
+        StringPiece src, ByteSink &sink, Edits *edits,
+        UErrorCode &errorCode) {
+    ucasemap_mapUTF8(
+        ustrcase_getCaseLocale(locale), options, UCASEMAP_BREAK_ITERATOR_NULL
+        src.data(), src.length(),
+        ucasemap_internalUTF8ToLower, sink, edits, errorCode);
+}
+
+void CaseMap::utf8ToUpper(
+        const char *locale, uint32_t options,
+        StringPiece src, ByteSink &sink, Edits *edits,
+        UErrorCode &errorCode) {
+    ucasemap_mapUTF8(
+        ustrcase_getCaseLocale(locale), options, UCASEMAP_BREAK_ITERATOR_NULL
+        src.data(), src.length(),
+        ucasemap_internalUTF8ToUpper, sink, edits, errorCode);
+}
+
+void CaseMap::utf8Fold(
+        uint32_t options,
+        StringPiece src, ByteSink &sink, Edits *edits,
+        UErrorCode &errorCode) {
+    ucasemap_mapUTF8(
+        UCASE_LOC_ROOT, options, UCASEMAP_BREAK_ITERATOR_NULL
+        src.data(), src.length(),
+        ucasemap_internalUTF8Fold, sink, edits, errorCode);
+}
+
+int32_t CaseMap::utf8ToLower(
+        const char *locale, uint32_t options,
+        const char *src, int32_t srcLength,
+        char *dest, int32_t destCapacity, Edits *edits,
+        UErrorCode &errorCode) {
+    return ucasemap_mapUTF8(
+        ustrcase_getCaseLocale(locale), options, UCASEMAP_BREAK_ITERATOR_NULL
+        dest, destCapacity,
+        src, srcLength,
+        ucasemap_internalUTF8ToLower, edits, errorCode);
+}
+
+int32_t CaseMap::utf8ToUpper(
+        const char *locale, uint32_t options,
+        const char *src, int32_t srcLength,
+        char *dest, int32_t destCapacity, Edits *edits,
+        UErrorCode &errorCode) {
+    return ucasemap_mapUTF8(
+        ustrcase_getCaseLocale(locale), options, UCASEMAP_BREAK_ITERATOR_NULL
+        dest, destCapacity,
+        src, srcLength,
+        ucasemap_internalUTF8ToUpper, edits, errorCode);
+}
+
+int32_t CaseMap::utf8Fold(
+        uint32_t options,
+        const char *src, int32_t srcLength,
+        char *dest, int32_t destCapacity, Edits *edits,
+        UErrorCode &errorCode) {
+    return ucasemap_mapUTF8(
+        UCASE_LOC_ROOT, options, UCASEMAP_BREAK_ITERATOR_NULL
+        dest, destCapacity,
+        src, srcLength,
+        ucasemap_internalUTF8Fold, edits, errorCode);
+}
+
+U_NAMESPACE_END