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      1 //  2017 and later: Unicode, Inc. and others.
      2 // License & terms of use: http://www.unicode.org/copyright.html
      3 
      4 // ucptrie.cpp (modified from utrie2.cpp)
      5 // created: 2017dec29 Markus W. Scherer
      6 
      7 // #define UCPTRIE_DEBUG
      8 #ifdef UCPTRIE_DEBUG
      9 #   include <stdio.h>
     10 #endif
     11 
     12 #include "unicode/utypes.h"
     13 #include "unicode/ucptrie.h"
     14 #include "unicode/utf.h"
     15 #include "unicode/utf8.h"
     16 #include "unicode/utf16.h"
     17 #include "cmemory.h"
     18 #include "uassert.h"
     19 #include "ucptrie_impl.h"
     20 
     21 U_CAPI UCPTrie * U_EXPORT2
     22 ucptrie_openFromBinary(UCPTrieType type, UCPTrieValueWidth valueWidth,
     23                        const void *data, int32_t length, int32_t *pActualLength,
     24                        UErrorCode *pErrorCode) {
     25     if (U_FAILURE(*pErrorCode)) {
     26         return nullptr;
     27     }
     28 
     29     if (length <= 0 || (U_POINTER_MASK_LSB(data, 3) != 0) ||
     30             type < UCPTRIE_TYPE_ANY || UCPTRIE_TYPE_SMALL < type ||
     31             valueWidth < UCPTRIE_VALUE_BITS_ANY || UCPTRIE_VALUE_BITS_8 < valueWidth) {
     32         *pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
     33         return nullptr;
     34     }
     35 
     36     // Enough data for a trie header?
     37     if (length < (int32_t)sizeof(UCPTrieHeader)) {
     38         *pErrorCode = U_INVALID_FORMAT_ERROR;
     39         return nullptr;
     40     }
     41 
     42     // Check the signature.
     43     const UCPTrieHeader *header = (const UCPTrieHeader *)data;
     44     if (header->signature != UCPTRIE_SIG) {
     45         *pErrorCode = U_INVALID_FORMAT_ERROR;
     46         return nullptr;
     47     }
     48 
     49     int32_t options = header->options;
     50     int32_t typeInt = (options >> 6) & 3;
     51     int32_t valueWidthInt = options & UCPTRIE_OPTIONS_VALUE_BITS_MASK;
     52     if (typeInt > UCPTRIE_TYPE_SMALL || valueWidthInt > UCPTRIE_VALUE_BITS_8 ||
     53             (options & UCPTRIE_OPTIONS_RESERVED_MASK) != 0) {
     54         *pErrorCode = U_INVALID_FORMAT_ERROR;
     55         return nullptr;
     56     }
     57     UCPTrieType actualType = (UCPTrieType)typeInt;
     58     UCPTrieValueWidth actualValueWidth = (UCPTrieValueWidth)valueWidthInt;
     59     if (type < 0) {
     60         type = actualType;
     61     }
     62     if (valueWidth < 0) {
     63         valueWidth = actualValueWidth;
     64     }
     65     if (type != actualType || valueWidth != actualValueWidth) {
     66         *pErrorCode = U_INVALID_FORMAT_ERROR;
     67         return nullptr;
     68     }
     69 
     70     // Get the length values and offsets.
     71     UCPTrie tempTrie;
     72     uprv_memset(&tempTrie, 0, sizeof(tempTrie));
     73     tempTrie.indexLength = header->indexLength;
     74     tempTrie.dataLength =
     75         ((options & UCPTRIE_OPTIONS_DATA_LENGTH_MASK) << 4) | header->dataLength;
     76     tempTrie.index3NullOffset = header->index3NullOffset;
     77     tempTrie.dataNullOffset =
     78         ((options & UCPTRIE_OPTIONS_DATA_NULL_OFFSET_MASK) << 8) | header->dataNullOffset;
     79 
     80     tempTrie.highStart = header->shiftedHighStart << UCPTRIE_SHIFT_2;
     81     tempTrie.shifted12HighStart = (tempTrie.highStart + 0xfff) >> 12;
     82     tempTrie.type = type;
     83     tempTrie.valueWidth = valueWidth;
     84 
     85     // Calculate the actual length.
     86     int32_t actualLength = (int32_t)sizeof(UCPTrieHeader) + tempTrie.indexLength * 2;
     87     if (valueWidth == UCPTRIE_VALUE_BITS_16) {
     88         actualLength += tempTrie.dataLength * 2;
     89     } else if (valueWidth == UCPTRIE_VALUE_BITS_32) {
     90         actualLength += tempTrie.dataLength * 4;
     91     } else {
     92         actualLength += tempTrie.dataLength;
     93     }
     94     if (length < actualLength) {
     95         *pErrorCode = U_INVALID_FORMAT_ERROR;  // Not enough bytes.
     96         return nullptr;
     97     }
     98 
     99     // Allocate the trie.
    100     UCPTrie *trie = (UCPTrie *)uprv_malloc(sizeof(UCPTrie));
    101     if (trie == nullptr) {
    102         *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
    103         return nullptr;
    104     }
    105     uprv_memcpy(trie, &tempTrie, sizeof(tempTrie));
    106 #ifdef UCPTRIE_DEBUG
    107     trie->name = "fromSerialized";
    108 #endif
    109 
    110     // Set the pointers to its index and data arrays.
    111     const uint16_t *p16 = (const uint16_t *)(header + 1);
    112     trie->index = p16;
    113     p16 += trie->indexLength;
    114 
    115     // Get the data.
    116     int32_t nullValueOffset = trie->dataNullOffset;
    117     if (nullValueOffset >= trie->dataLength) {
    118         nullValueOffset = trie->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET;
    119     }
    120     switch (valueWidth) {
    121     case UCPTRIE_VALUE_BITS_16:
    122         trie->data.ptr16 = p16;
    123         trie->nullValue = trie->data.ptr16[nullValueOffset];
    124         break;
    125     case UCPTRIE_VALUE_BITS_32:
    126         trie->data.ptr32 = (const uint32_t *)p16;
    127         trie->nullValue = trie->data.ptr32[nullValueOffset];
    128         break;
    129     case UCPTRIE_VALUE_BITS_8:
    130         trie->data.ptr8 = (const uint8_t *)p16;
    131         trie->nullValue = trie->data.ptr8[nullValueOffset];
    132         break;
    133     default:
    134         // Unreachable because valueWidth was checked above.
    135         *pErrorCode = U_INVALID_FORMAT_ERROR;
    136         return nullptr;
    137     }
    138 
    139     if (pActualLength != nullptr) {
    140         *pActualLength = actualLength;
    141     }
    142     return trie;
    143 }
    144 
    145 U_CAPI void U_EXPORT2
    146 ucptrie_close(UCPTrie *trie) {
    147     uprv_free(trie);
    148 }
    149 
    150 U_CAPI UCPTrieType U_EXPORT2
    151 ucptrie_getType(const UCPTrie *trie) {
    152     return (UCPTrieType)trie->type;
    153 }
    154 
    155 U_CAPI UCPTrieValueWidth U_EXPORT2
    156 ucptrie_getValueWidth(const UCPTrie *trie) {
    157     return (UCPTrieValueWidth)trie->valueWidth;
    158 }
    159 
    160 U_CAPI int32_t U_EXPORT2
    161 ucptrie_internalSmallIndex(const UCPTrie *trie, UChar32 c) {
    162     int32_t i1 = c >> UCPTRIE_SHIFT_1;
    163     if (trie->type == UCPTRIE_TYPE_FAST) {
    164         U_ASSERT(0xffff < c && c < trie->highStart);
    165         i1 += UCPTRIE_BMP_INDEX_LENGTH - UCPTRIE_OMITTED_BMP_INDEX_1_LENGTH;
    166     } else {
    167         U_ASSERT((uint32_t)c < (uint32_t)trie->highStart && trie->highStart > UCPTRIE_SMALL_LIMIT);
    168         i1 += UCPTRIE_SMALL_INDEX_LENGTH;
    169     }
    170     int32_t i3Block = trie->index[
    171         (int32_t)trie->index[i1] + ((c >> UCPTRIE_SHIFT_2) & UCPTRIE_INDEX_2_MASK)];
    172     int32_t i3 = (c >> UCPTRIE_SHIFT_3) & UCPTRIE_INDEX_3_MASK;
    173     int32_t dataBlock;
    174     if ((i3Block & 0x8000) == 0) {
    175         // 16-bit indexes
    176         dataBlock = trie->index[i3Block + i3];
    177     } else {
    178         // 18-bit indexes stored in groups of 9 entries per 8 indexes.
    179         i3Block = (i3Block & 0x7fff) + (i3 & ~7) + (i3 >> 3);
    180         i3 &= 7;
    181         dataBlock = ((int32_t)trie->index[i3Block++] << (2 + (2 * i3))) & 0x30000;
    182         dataBlock |= trie->index[i3Block + i3];
    183     }
    184     return dataBlock + (c & UCPTRIE_SMALL_DATA_MASK);
    185 }
    186 
    187 U_CAPI int32_t U_EXPORT2
    188 ucptrie_internalSmallU8Index(const UCPTrie *trie, int32_t lt1, uint8_t t2, uint8_t t3) {
    189     UChar32 c = (lt1 << 12) | (t2 << 6) | t3;
    190     if (c >= trie->highStart) {
    191         // Possible because the UTF-8 macro compares with shifted12HighStart which may be higher.
    192         return trie->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET;
    193     }
    194     return ucptrie_internalSmallIndex(trie, c);
    195 }
    196 
    197 U_CAPI int32_t U_EXPORT2
    198 ucptrie_internalU8PrevIndex(const UCPTrie *trie, UChar32 c,
    199                             const uint8_t *start, const uint8_t *src) {
    200     int32_t i, length;
    201     // Support 64-bit pointers by avoiding cast of arbitrary difference.
    202     if ((src - start) <= 7) {
    203         i = length = (int32_t)(src - start);
    204     } else {
    205         i = length = 7;
    206         start = src - 7;
    207     }
    208     c = utf8_prevCharSafeBody(start, 0, &i, c, -1);
    209     i = length - i;  // Number of bytes read backward from src.
    210     int32_t idx = _UCPTRIE_CP_INDEX(trie, 0xffff, c);
    211     return (idx << 3) | i;
    212 }
    213 
    214 namespace {
    215 
    216 inline uint32_t getValue(UCPTrieData data, UCPTrieValueWidth valueWidth, int32_t dataIndex) {
    217     switch (valueWidth) {
    218     case UCPTRIE_VALUE_BITS_16:
    219         return data.ptr16[dataIndex];
    220     case UCPTRIE_VALUE_BITS_32:
    221         return data.ptr32[dataIndex];
    222     case UCPTRIE_VALUE_BITS_8:
    223         return data.ptr8[dataIndex];
    224     default:
    225         // Unreachable if the trie is properly initialized.
    226         return 0xffffffff;
    227     }
    228 }
    229 
    230 }  // namespace
    231 
    232 U_CAPI uint32_t U_EXPORT2
    233 ucptrie_get(const UCPTrie *trie, UChar32 c) {
    234     int32_t dataIndex;
    235     if ((uint32_t)c <= 0x7f) {
    236         // linear ASCII
    237         dataIndex = c;
    238     } else {
    239         UChar32 fastMax = trie->type == UCPTRIE_TYPE_FAST ? 0xffff : UCPTRIE_SMALL_MAX;
    240         dataIndex = _UCPTRIE_CP_INDEX(trie, fastMax, c);
    241     }
    242     return getValue(trie->data, (UCPTrieValueWidth)trie->valueWidth, dataIndex);
    243 }
    244 
    245 namespace {
    246 
    247 constexpr int32_t MAX_UNICODE = 0x10ffff;
    248 
    249 inline uint32_t maybeFilterValue(uint32_t value, uint32_t trieNullValue, uint32_t nullValue,
    250                                  UCPMapValueFilter *filter, const void *context) {
    251     if (value == trieNullValue) {
    252         value = nullValue;
    253     } else if (filter != nullptr) {
    254         value = filter(context, value);
    255     }
    256     return value;
    257 }
    258 
    259 UChar32 getRange(const void *t, UChar32 start,
    260                  UCPMapValueFilter *filter, const void *context, uint32_t *pValue) {
    261     if ((uint32_t)start > MAX_UNICODE) {
    262         return U_SENTINEL;
    263     }
    264     const UCPTrie *trie = reinterpret_cast<const UCPTrie *>(t);
    265     UCPTrieValueWidth valueWidth = (UCPTrieValueWidth)trie->valueWidth;
    266     if (start >= trie->highStart) {
    267         if (pValue != nullptr) {
    268             int32_t di = trie->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET;
    269             uint32_t value = getValue(trie->data, valueWidth, di);
    270             if (filter != nullptr) { value = filter(context, value); }
    271             *pValue = value;
    272         }
    273         return MAX_UNICODE;
    274     }
    275 
    276     uint32_t nullValue = trie->nullValue;
    277     if (filter != nullptr) { nullValue = filter(context, nullValue); }
    278     const uint16_t *index = trie->index;
    279 
    280     int32_t prevI3Block = -1;
    281     int32_t prevBlock = -1;
    282     UChar32 c = start;
    283     uint32_t trieValue, value;
    284     bool haveValue = false;
    285     do {
    286         int32_t i3Block;
    287         int32_t i3;
    288         int32_t i3BlockLength;
    289         int32_t dataBlockLength;
    290         if (c <= 0xffff && (trie->type == UCPTRIE_TYPE_FAST || c <= UCPTRIE_SMALL_MAX)) {
    291             i3Block = 0;
    292             i3 = c >> UCPTRIE_FAST_SHIFT;
    293             i3BlockLength = trie->type == UCPTRIE_TYPE_FAST ?
    294                 UCPTRIE_BMP_INDEX_LENGTH : UCPTRIE_SMALL_INDEX_LENGTH;
    295             dataBlockLength = UCPTRIE_FAST_DATA_BLOCK_LENGTH;
    296         } else {
    297             // Use the multi-stage index.
    298             int32_t i1 = c >> UCPTRIE_SHIFT_1;
    299             if (trie->type == UCPTRIE_TYPE_FAST) {
    300                 U_ASSERT(0xffff < c && c < trie->highStart);
    301                 i1 += UCPTRIE_BMP_INDEX_LENGTH - UCPTRIE_OMITTED_BMP_INDEX_1_LENGTH;
    302             } else {
    303                 U_ASSERT(c < trie->highStart && trie->highStart > UCPTRIE_SMALL_LIMIT);
    304                 i1 += UCPTRIE_SMALL_INDEX_LENGTH;
    305             }
    306             i3Block = trie->index[
    307                 (int32_t)trie->index[i1] + ((c >> UCPTRIE_SHIFT_2) & UCPTRIE_INDEX_2_MASK)];
    308             if (i3Block == prevI3Block && (c - start) >= UCPTRIE_CP_PER_INDEX_2_ENTRY) {
    309                 // The index-3 block is the same as the previous one, and filled with value.
    310                 U_ASSERT((c & (UCPTRIE_CP_PER_INDEX_2_ENTRY - 1)) == 0);
    311                 c += UCPTRIE_CP_PER_INDEX_2_ENTRY;
    312                 continue;
    313             }
    314             prevI3Block = i3Block;
    315             if (i3Block == trie->index3NullOffset) {
    316                 // This is the index-3 null block.
    317                 if (haveValue) {
    318                     if (nullValue != value) {
    319                         return c - 1;
    320                     }
    321                 } else {
    322                     trieValue = trie->nullValue;
    323                     value = nullValue;
    324                     if (pValue != nullptr) { *pValue = nullValue; }
    325                     haveValue = true;
    326                 }
    327                 prevBlock = trie->dataNullOffset;
    328                 c = (c + UCPTRIE_CP_PER_INDEX_2_ENTRY) & ~(UCPTRIE_CP_PER_INDEX_2_ENTRY - 1);
    329                 continue;
    330             }
    331             i3 = (c >> UCPTRIE_SHIFT_3) & UCPTRIE_INDEX_3_MASK;
    332             i3BlockLength = UCPTRIE_INDEX_3_BLOCK_LENGTH;
    333             dataBlockLength = UCPTRIE_SMALL_DATA_BLOCK_LENGTH;
    334         }
    335         // Enumerate data blocks for one index-3 block.
    336         do {
    337             int32_t block;
    338             if ((i3Block & 0x8000) == 0) {
    339                 block = index[i3Block + i3];
    340             } else {
    341                 // 18-bit indexes stored in groups of 9 entries per 8 indexes.
    342                 int32_t group = (i3Block & 0x7fff) + (i3 & ~7) + (i3 >> 3);
    343                 int32_t gi = i3 & 7;
    344                 block = ((int32_t)index[group++] << (2 + (2 * gi))) & 0x30000;
    345                 block |= index[group + gi];
    346             }
    347             if (block == prevBlock && (c - start) >= dataBlockLength) {
    348                 // The block is the same as the previous one, and filled with value.
    349                 U_ASSERT((c & (dataBlockLength - 1)) == 0);
    350                 c += dataBlockLength;
    351             } else {
    352                 int32_t dataMask = dataBlockLength - 1;
    353                 prevBlock = block;
    354                 if (block == trie->dataNullOffset) {
    355                     // This is the data null block.
    356                     if (haveValue) {
    357                         if (nullValue != value) {
    358                             return c - 1;
    359                         }
    360                     } else {
    361                         trieValue = trie->nullValue;
    362                         value = nullValue;
    363                         if (pValue != nullptr) { *pValue = nullValue; }
    364                         haveValue = true;
    365                     }
    366                     c = (c + dataBlockLength) & ~dataMask;
    367                 } else {
    368                     int32_t di = block + (c & dataMask);
    369                     uint32_t trieValue2 = getValue(trie->data, valueWidth, di);
    370                     if (haveValue) {
    371                         if (trieValue2 != trieValue) {
    372                             if (filter == nullptr ||
    373                                     maybeFilterValue(trieValue2, trie->nullValue, nullValue,
    374                                                      filter, context) != value) {
    375                                 return c - 1;
    376                             }
    377                             trieValue = trieValue2;  // may or may not help
    378                         }
    379                     } else {
    380                         trieValue = trieValue2;
    381                         value = maybeFilterValue(trieValue2, trie->nullValue, nullValue,
    382                                                  filter, context);
    383                         if (pValue != nullptr) { *pValue = value; }
    384                         haveValue = true;
    385                     }
    386                     while ((++c & dataMask) != 0) {
    387                         trieValue2 = getValue(trie->data, valueWidth, ++di);
    388                         if (trieValue2 != trieValue) {
    389                             if (filter == nullptr ||
    390                                     maybeFilterValue(trieValue2, trie->nullValue, nullValue,
    391                                                      filter, context) != value) {
    392                                 return c - 1;
    393                             }
    394                             trieValue = trieValue2;  // may or may not help
    395                         }
    396                     }
    397                 }
    398             }
    399         } while (++i3 < i3BlockLength);
    400     } while (c < trie->highStart);
    401     U_ASSERT(haveValue);
    402     int32_t di = trie->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET;
    403     uint32_t highValue = getValue(trie->data, valueWidth, di);
    404     if (maybeFilterValue(highValue, trie->nullValue, nullValue,
    405                          filter, context) != value) {
    406         return c - 1;
    407     } else {
    408         return MAX_UNICODE;
    409     }
    410 }
    411 
    412 }  // namespace
    413 
    414 U_CFUNC UChar32
    415 ucptrie_internalGetRange(UCPTrieGetRange *getRange,
    416                          const void *trie, UChar32 start,
    417                          UCPMapRangeOption option, uint32_t surrogateValue,
    418                          UCPMapValueFilter *filter, const void *context, uint32_t *pValue) {
    419     if (option == UCPMAP_RANGE_NORMAL) {
    420         return getRange(trie, start, filter, context, pValue);
    421     }
    422     uint32_t value;
    423     if (pValue == nullptr) {
    424         // We need to examine the range value even if the caller does not want it.
    425         pValue = &value;
    426     }
    427     UChar32 surrEnd = option == UCPMAP_RANGE_FIXED_ALL_SURROGATES ? 0xdfff : 0xdbff;
    428     UChar32 end = getRange(trie, start, filter, context, pValue);
    429     if (end < 0xd7ff || start > surrEnd) {
    430         return end;
    431     }
    432     // The range overlaps with surrogates, or ends just before the first one.
    433     if (*pValue == surrogateValue) {
    434         if (end >= surrEnd) {
    435             // Surrogates followed by a non-surrogateValue range,
    436             // or surrogates are part of a larger surrogateValue range.
    437             return end;
    438         }
    439     } else {
    440         if (start <= 0xd7ff) {
    441             return 0xd7ff;  // Non-surrogateValue range ends before surrogateValue surrogates.
    442         }
    443         // Start is a surrogate with a non-surrogateValue code *unit* value.
    444         // Return a surrogateValue code *point* range.
    445         *pValue = surrogateValue;
    446         if (end > surrEnd) {
    447             return surrEnd;  // Surrogate range ends before non-surrogateValue rest of range.
    448         }
    449     }
    450     // See if the surrogateValue surrogate range can be merged with
    451     // an immediately following range.
    452     uint32_t value2;
    453     UChar32 end2 = getRange(trie, surrEnd + 1, filter, context, &value2);
    454     if (value2 == surrogateValue) {
    455         return end2;
    456     }
    457     return surrEnd;
    458 }
    459 
    460 U_CAPI UChar32 U_EXPORT2
    461 ucptrie_getRange(const UCPTrie *trie, UChar32 start,
    462                  UCPMapRangeOption option, uint32_t surrogateValue,
    463                  UCPMapValueFilter *filter, const void *context, uint32_t *pValue) {
    464     return ucptrie_internalGetRange(getRange, trie, start,
    465                                     option, surrogateValue,
    466                                     filter, context, pValue);
    467 }
    468 
    469 U_CAPI int32_t U_EXPORT2
    470 ucptrie_toBinary(const UCPTrie *trie,
    471                  void *data, int32_t capacity,
    472                  UErrorCode *pErrorCode) {
    473     if (U_FAILURE(*pErrorCode)) {
    474         return 0;
    475     }
    476 
    477     UCPTrieType type = (UCPTrieType)trie->type;
    478     UCPTrieValueWidth valueWidth = (UCPTrieValueWidth)trie->valueWidth;
    479     if (type < UCPTRIE_TYPE_FAST || UCPTRIE_TYPE_SMALL < type ||
    480             valueWidth < UCPTRIE_VALUE_BITS_16 || UCPTRIE_VALUE_BITS_8 < valueWidth ||
    481             capacity < 0 ||
    482             (capacity > 0 && (data == nullptr || (U_POINTER_MASK_LSB(data, 3) != 0)))) {
    483         *pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
    484         return 0;
    485     }
    486 
    487     int32_t length = (int32_t)sizeof(UCPTrieHeader) + trie->indexLength * 2;
    488     switch (valueWidth) {
    489     case UCPTRIE_VALUE_BITS_16:
    490         length += trie->dataLength * 2;
    491         break;
    492     case UCPTRIE_VALUE_BITS_32:
    493         length += trie->dataLength * 4;
    494         break;
    495     case UCPTRIE_VALUE_BITS_8:
    496         length += trie->dataLength;
    497         break;
    498     default:
    499         // unreachable
    500         break;
    501     }
    502     if (capacity < length) {
    503         *pErrorCode = U_BUFFER_OVERFLOW_ERROR;
    504         return length;
    505     }
    506 
    507     char *bytes = (char *)data;
    508     UCPTrieHeader *header = (UCPTrieHeader *)bytes;
    509     header->signature = UCPTRIE_SIG;  // "Tri3"
    510     header->options = (uint16_t)(
    511         ((trie->dataLength & 0xf0000) >> 4) |
    512         ((trie->dataNullOffset & 0xf0000) >> 8) |
    513         (trie->type << 6) |
    514         valueWidth);
    515     header->indexLength = (uint16_t)trie->indexLength;
    516     header->dataLength = (uint16_t)trie->dataLength;
    517     header->index3NullOffset = trie->index3NullOffset;
    518     header->dataNullOffset = (uint16_t)trie->dataNullOffset;
    519     header->shiftedHighStart = trie->highStart >> UCPTRIE_SHIFT_2;
    520     bytes += sizeof(UCPTrieHeader);
    521 
    522     uprv_memcpy(bytes, trie->index, trie->indexLength * 2);
    523     bytes += trie->indexLength * 2;
    524 
    525     switch (valueWidth) {
    526     case UCPTRIE_VALUE_BITS_16:
    527         uprv_memcpy(bytes, trie->data.ptr16, trie->dataLength * 2);
    528         break;
    529     case UCPTRIE_VALUE_BITS_32:
    530         uprv_memcpy(bytes, trie->data.ptr32, trie->dataLength * 4);
    531         break;
    532     case UCPTRIE_VALUE_BITS_8:
    533         uprv_memcpy(bytes, trie->data.ptr8, trie->dataLength);
    534         break;
    535     default:
    536         // unreachable
    537         break;
    538     }
    539     return length;
    540 }
    541 
    542 namespace {
    543 
    544 #ifdef UCPTRIE_DEBUG
    545 long countNull(const UCPTrie *trie) {
    546     uint32_t nullValue=trie->nullValue;
    547     int32_t length=trie->dataLength;
    548     long count=0;
    549     switch (trie->valueWidth) {
    550     case UCPTRIE_VALUE_BITS_16:
    551         for(int32_t i=0; i<length; ++i) {
    552             if(trie->data.ptr16[i]==nullValue) { ++count; }
    553         }
    554         break;
    555     case UCPTRIE_VALUE_BITS_32:
    556         for(int32_t i=0; i<length; ++i) {
    557             if(trie->data.ptr32[i]==nullValue) { ++count; }
    558         }
    559         break;
    560     case UCPTRIE_VALUE_BITS_8:
    561         for(int32_t i=0; i<length; ++i) {
    562             if(trie->data.ptr8[i]==nullValue) { ++count; }
    563         }
    564         break;
    565     default:
    566         // unreachable
    567         break;
    568     }
    569     return count;
    570 }
    571 
    572 U_CFUNC void
    573 ucptrie_printLengths(const UCPTrie *trie, const char *which) {
    574     long indexLength=trie->indexLength;
    575     long dataLength=(long)trie->dataLength;
    576     long totalLength=(long)sizeof(UCPTrieHeader)+indexLength*2+
    577             dataLength*(trie->valueWidth==UCPTRIE_VALUE_BITS_16 ? 2 :
    578                         trie->valueWidth==UCPTRIE_VALUE_BITS_32 ? 4 : 1);
    579     printf("**UCPTrieLengths(%s %s)** index:%6ld  data:%6ld  countNull:%6ld  serialized:%6ld\n",
    580            which, trie->name, indexLength, dataLength, countNull(trie), totalLength);
    581 }
    582 #endif
    583 
    584 }  // namespace
    585 
    586 // UCPMap ----
    587 // Initially, this is the same as UCPTrie. This may well change.
    588 
    589 U_CAPI uint32_t U_EXPORT2
    590 ucpmap_get(const UCPMap *map, UChar32 c) {
    591     return ucptrie_get(reinterpret_cast<const UCPTrie *>(map), c);
    592 }
    593 
    594 U_CAPI UChar32 U_EXPORT2
    595 ucpmap_getRange(const UCPMap *map, UChar32 start,
    596                 UCPMapRangeOption option, uint32_t surrogateValue,
    597                 UCPMapValueFilter *filter, const void *context, uint32_t *pValue) {
    598     return ucptrie_getRange(reinterpret_cast<const UCPTrie *>(map), start,
    599                             option, surrogateValue,
    600                             filter, context, pValue);
    601 }
    602