The Tor Browser: intl/icu/source/common/utrie2_builder.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/utrie2_builder.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/utrie2_builder.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
 ******************************************************************************
 *
 *   Copyright (C) 2001-2011, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 ******************************************************************************
 *   file name:  utrie2_builder.cpp
 *   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 2008sep26 (split off from utrie2.c)
 *   created by: Markus W. Scherer
 *
 *   This is a common implementation of a Unicode trie.
 *   It is a kind of compressed, serializable table of 16- or 32-bit values associated with
 *   Unicode code points (0..0x10ffff).
 *   This is the second common version of a Unicode trie (hence the name UTrie2).
 *   See utrie2.h for a comparison.
 *
 *   This file contains only the builder code.
 *   See utrie2.c for the runtime and enumeration code.
 */
 #ifdef UTRIE2_DEBUG
 #   include <stdio.h>
 #endif
 #include "unicode/utypes.h"
 #include "cmemory.h"
 #include "utrie2.h"
 #include "utrie2_impl.h"
 #include "utrie.h" /* for utrie2_fromUTrie() and utrie_swap() */
 #define LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0]))
 /* Implementation notes ----------------------------------------------------- */
 /*
  * The UTRIE2_SHIFT_1, UTRIE2_SHIFT_2, UTRIE2_INDEX_SHIFT and other values
  * have been chosen to minimize trie sizes overall.
  * Most of the code is flexible enough to work with a range of values,
  * within certain limits.
  *
  * Exception: Support for separate values for lead surrogate code _units_
  * vs. code _points_ was added after the constants were fixed,
  * and has not been tested nor particularly designed for different constant values.
  * (Especially the utrie2_enum() code that jumps to the special LSCP index-2
  * part and back.)
  *
  * Requires UTRIE2_SHIFT_2<=6. Otherwise 0xc0 which is the top of the ASCII-linear data
  * including the bad-UTF-8-data block is not a multiple of UTRIE2_DATA_BLOCK_LENGTH
  * and map[block>>UTRIE2_SHIFT_2] (used in reference counting and compaction
  * remapping) stops working.
  *
  * Requires UTRIE2_SHIFT_1>=10 because utrie2_enumForLeadSurrogate()
  * assumes that a single index-2 block is used for 0x400 code points
  * corresponding to one lead surrogate.
  *
  * Requires UTRIE2_SHIFT_1<=16. Otherwise one single index-2 block contains
  * more than one Unicode plane, and the split of the index-2 table into a BMP
  * part and a supplementary part, with a gap in between, would not work.
  *
  * Requires UTRIE2_INDEX_SHIFT>=1 not because of the code but because
  * there is data with more than 64k distinct values,
  * for example for Unihan collation with a separate collation weight per
  * Han character.
  */
 /* Building a trie ----------------------------------------------------------*/
 enum {
     /** The null index-2 block, following the gap in the index-2 table. */
     UNEWTRIE2_INDEX_2_NULL_OFFSET=UNEWTRIE2_INDEX_GAP_OFFSET+UNEWTRIE2_INDEX_GAP_LENGTH,
     /** The start of allocated index-2 blocks. */
     UNEWTRIE2_INDEX_2_START_OFFSET=UNEWTRIE2_INDEX_2_NULL_OFFSET+UTRIE2_INDEX_2_BLOCK_LENGTH,
     /**
      * The null data block.
      * Length 64=0x40 even if UTRIE2_DATA_BLOCK_LENGTH is smaller,
      * to work with 6-bit trail bytes from 2-byte UTF-8.
      */
     UNEWTRIE2_DATA_NULL_OFFSET=UTRIE2_DATA_START_OFFSET,
     /** The start of allocated data blocks. */
     UNEWTRIE2_DATA_START_OFFSET=UNEWTRIE2_DATA_NULL_OFFSET+0x40,
     /**
      * The start of data blocks for U+0800 and above.
      * Below, compaction uses a block length of 64 for 2-byte UTF-8.
      * From here on, compaction uses UTRIE2_DATA_BLOCK_LENGTH.
      * Data values for 0x780 code points beyond ASCII.
      */
     UNEWTRIE2_DATA_0800_OFFSET=UNEWTRIE2_DATA_START_OFFSET+0x780
 };
 /* Start with allocation of 16k data entries. */
 #define UNEWTRIE2_INITIAL_DATA_LENGTH ((int32_t)1<<14)
 /* Grow about 8x each time. */
 #define UNEWTRIE2_MEDIUM_DATA_LENGTH ((int32_t)1<<17)
 static int32_t
 allocIndex2Block(UNewTrie2 *trie);
 U_CAPI UTrie2 * U_EXPORT2
 utrie2_open(uint32_t initialValue, uint32_t errorValue, UErrorCode *pErrorCode) {
     UTrie2 *trie;
     UNewTrie2 *newTrie;
     uint32_t *data;
     int32_t i, j;
     if(U_FAILURE(*pErrorCode)) {
         return NULL;
     }
     trie=(UTrie2 *)uprv_malloc(sizeof(UTrie2));
     newTrie=(UNewTrie2 *)uprv_malloc(sizeof(UNewTrie2));
     data=(uint32_t *)uprv_malloc(UNEWTRIE2_INITIAL_DATA_LENGTH*4);
     if(trie==NULL || newTrie==NULL || data==NULL) {
         uprv_free(trie);
         uprv_free(newTrie);
         uprv_free(data);
         *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
         return 0;
     }
     uprv_memset(trie, 0, sizeof(UTrie2));
     trie->initialValue=initialValue;
     trie->errorValue=errorValue;
     trie->highStart=0x110000;
     trie->newTrie=newTrie;
     newTrie->data=data;
     newTrie->dataCapacity=UNEWTRIE2_INITIAL_DATA_LENGTH;
     newTrie->initialValue=initialValue;
     newTrie->errorValue=errorValue;
     newTrie->highStart=0x110000;
     newTrie->firstFreeBlock=0;  /* no free block in the list */
     newTrie->isCompacted=FALSE;
     /*
      * preallocate and reset
      * - ASCII
      * - the bad-UTF-8-data block
      * - the null data block
      */
     for(i=0; i<0x80; ++i) {
         newTrie->data[i]=initialValue;
     }
     for(; i<0xc0; ++i) {
         newTrie->data[i]=errorValue;
     }
     for(i=UNEWTRIE2_DATA_NULL_OFFSET; i<UNEWTRIE2_DATA_START_OFFSET; ++i) {
         newTrie->data[i]=initialValue;
     }
     newTrie->dataNullOffset=UNEWTRIE2_DATA_NULL_OFFSET;
     newTrie->dataLength=UNEWTRIE2_DATA_START_OFFSET;
     /* set the index-2 indexes for the 2=0x80>>UTRIE2_SHIFT_2 ASCII data blocks */
     for(i=0, j=0; j<0x80; ++i, j+=UTRIE2_DATA_BLOCK_LENGTH) {
         newTrie->index2[i]=j;
         newTrie->map[i]=1;
     }
     /* reference counts for the bad-UTF-8-data block */
     for(; j<0xc0; ++i, j+=UTRIE2_DATA_BLOCK_LENGTH) {
         newTrie->map[i]=0;
     }
     /*
      * Reference counts for the null data block: all blocks except for the ASCII blocks.
      * Plus 1 so that we don't drop this block during compaction.
      * Plus as many as needed for lead surrogate code points.
      */
     /* i==newTrie->dataNullOffset */
     newTrie->map[i++]=
         (0x110000>>UTRIE2_SHIFT_2)-
         (0x80>>UTRIE2_SHIFT_2)+
 +
         UTRIE2_LSCP_INDEX_2_LENGTH;
     j+=UTRIE2_DATA_BLOCK_LENGTH;
     for(; j<UNEWTRIE2_DATA_START_OFFSET; ++i, j+=UTRIE2_DATA_BLOCK_LENGTH) {
         newTrie->map[i]=0;
     }
     /*
      * set the remaining indexes in the BMP index-2 block
      * to the null data block
      */
     for(i=0x80>>UTRIE2_SHIFT_2; i<UTRIE2_INDEX_2_BMP_LENGTH; ++i) {
         newTrie->index2[i]=UNEWTRIE2_DATA_NULL_OFFSET;
     }
     /*
      * Fill the index gap with impossible values so that compaction
      * does not overlap other index-2 blocks with the gap.
      */
     for(i=0; i<UNEWTRIE2_INDEX_GAP_LENGTH; ++i) {
         newTrie->index2[UNEWTRIE2_INDEX_GAP_OFFSET+i]=-1;
     }
     /* set the indexes in the null index-2 block */
     for(i=0; i<UTRIE2_INDEX_2_BLOCK_LENGTH; ++i) {
         newTrie->index2[UNEWTRIE2_INDEX_2_NULL_OFFSET+i]=UNEWTRIE2_DATA_NULL_OFFSET;
     }
     newTrie->index2NullOffset=UNEWTRIE2_INDEX_2_NULL_OFFSET;
     newTrie->index2Length=UNEWTRIE2_INDEX_2_START_OFFSET;
     /* set the index-1 indexes for the linear index-2 block */
     for(i=0, j=0;
         i<UTRIE2_OMITTED_BMP_INDEX_1_LENGTH;
         ++i, j+=UTRIE2_INDEX_2_BLOCK_LENGTH
     ) {
         newTrie->index1[i]=j;
     }
     /* set the remaining index-1 indexes to the null index-2 block */
     for(; i<UNEWTRIE2_INDEX_1_LENGTH; ++i) {
         newTrie->index1[i]=UNEWTRIE2_INDEX_2_NULL_OFFSET;
     }
     /*
      * Preallocate and reset data for U+0080..U+07ff,
      * for 2-byte UTF-8 which will be compacted in 64-blocks
      * even if UTRIE2_DATA_BLOCK_LENGTH is smaller.
      */
     for(i=0x80; i<0x800; i+=UTRIE2_DATA_BLOCK_LENGTH) {
         utrie2_set32(trie, i, initialValue, pErrorCode);
     }
     return trie;
 }
 static UNewTrie2 *
 cloneBuilder(const UNewTrie2 *other) {
     UNewTrie2 *trie;
     trie=(UNewTrie2 *)uprv_malloc(sizeof(UNewTrie2));
     if(trie==NULL) {
         return NULL;
     }
     trie->data=(uint32_t *)uprv_malloc(other->dataCapacity*4);
     if(trie->data==NULL) {
         uprv_free(trie);
         return NULL;
     }
     trie->dataCapacity=other->dataCapacity;
     /* clone data */
     uprv_memcpy(trie->index1, other->index1, sizeof(trie->index1));
     uprv_memcpy(trie->index2, other->index2, other->index2Length*4);
     trie->index2NullOffset=other->index2NullOffset;
     trie->index2Length=other->index2Length;
     uprv_memcpy(trie->data, other->data, other->dataLength*4);
     trie->dataNullOffset=other->dataNullOffset;
     trie->dataLength=other->dataLength;
     /* reference counters */
     if(other->isCompacted) {
         trie->firstFreeBlock=0;
     } else {
         uprv_memcpy(trie->map, other->map, (other->dataLength>>UTRIE2_SHIFT_2)*4);
         trie->firstFreeBlock=other->firstFreeBlock;
     }
     trie->initialValue=other->initialValue;
     trie->errorValue=other->errorValue;
     trie->highStart=other->highStart;
     trie->isCompacted=other->isCompacted;
     return trie;
 }
 U_CAPI UTrie2 * U_EXPORT2
 utrie2_clone(const UTrie2 *other, UErrorCode *pErrorCode) {
     UTrie2 *trie;
     if(U_FAILURE(*pErrorCode)) {
         return NULL;
     }
     if(other==NULL || (other->memory==NULL && other->newTrie==NULL)) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return NULL;
     }
     trie=(UTrie2 *)uprv_malloc(sizeof(UTrie2));
     if(trie==NULL) {
         return NULL;
     }
     uprv_memcpy(trie, other, sizeof(UTrie2));
     if(other->memory!=NULL) {
         trie->memory=uprv_malloc(other->length);
         if(trie->memory!=NULL) {
             trie->isMemoryOwned=TRUE;
             uprv_memcpy(trie->memory, other->memory, other->length);
             /* make the clone's pointers point to its own memory */
             trie->index=(uint16_t *)trie->memory+(other->index-(uint16_t *)other->memory);
             if(other->data16!=NULL) {
                 trie->data16=(uint16_t *)trie->memory+(other->data16-(uint16_t *)other->memory);
             }
             if(other->data32!=NULL) {
                 trie->data32=(uint32_t *)trie->memory+(other->data32-(uint32_t *)other->memory);
             }
         }
     } else /* other->newTrie!=NULL */ {
         trie->newTrie=cloneBuilder(other->newTrie);
     }
     if(trie->memory==NULL && trie->newTrie==NULL) {
         uprv_free(trie);
         trie=NULL;
     }
     return trie;
 }
 typedef struct NewTrieAndStatus {
     UTrie2 *trie;
     UErrorCode errorCode;
     UBool exclusiveLimit;  /* rather than inclusive range end */
 } NewTrieAndStatus;
 static UBool U_CALLCONV
 copyEnumRange(const void *context, UChar32 start, UChar32 end, uint32_t value) {
     NewTrieAndStatus *nt=(NewTrieAndStatus *)context;
     if(value!=nt->trie->initialValue) {
         if(nt->exclusiveLimit) {
             --end;
         }
         if(start==end) {
             utrie2_set32(nt->trie, start, value, &nt->errorCode);
         } else {
             utrie2_setRange32(nt->trie, start, end, value, TRUE, &nt->errorCode);
         }
         return U_SUCCESS(nt->errorCode);
     } else {
         return TRUE;
     }
 }
 #ifdef UTRIE2_DEBUG
 static void
 utrie_printLengths(const UTrie *trie) {
     long indexLength=trie->indexLength;
     long dataLength=(long)trie->dataLength;
     long totalLength=(long)sizeof(UTrieHeader)+indexLength*2+dataLength*(trie->data32!=NULL ? 4 : 2);
     printf("**UTrieLengths** index:%6ld  data:%6ld  serialized:%6ld\n",
            indexLength, dataLength, totalLength);
 }
 static void
 utrie2_printLengths(const UTrie2 *trie, const char *which) {
     long indexLength=trie->indexLength;
     long dataLength=(long)trie->dataLength;
     long totalLength=(long)sizeof(UTrie2Header)+indexLength*2+dataLength*(trie->data32!=NULL ? 4 : 2);
     printf("**UTrie2Lengths(%s)** index:%6ld  data:%6ld  serialized:%6ld\n",
            which, indexLength, dataLength, totalLength);
 }
 #endif
 U_CAPI UTrie2 * U_EXPORT2
 utrie2_cloneAsThawed(const UTrie2 *other, UErrorCode *pErrorCode) {
     NewTrieAndStatus context;
     UChar lead;
     if(U_FAILURE(*pErrorCode)) {
         return NULL;
     }
     if(other==NULL || (other->memory==NULL && other->newTrie==NULL)) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return NULL;
     }
     if(other->newTrie!=NULL && !other->newTrie->isCompacted) {
         return utrie2_clone(other, pErrorCode);  /* clone an unfrozen trie */
     }
     /* Clone the frozen trie by enumerating it and building a new one. */
     context.trie=utrie2_open(other->initialValue, other->errorValue, pErrorCode);
     if(U_FAILURE(*pErrorCode)) {
         return NULL;
     }
     context.exclusiveLimit=FALSE;
     context.errorCode=*pErrorCode;
     utrie2_enum(other, NULL, copyEnumRange, &context);
     *pErrorCode=context.errorCode;
     for(lead=0xd800; lead<0xdc00; ++lead) {
         uint32_t value;
         if(other->data32==NULL) {
             value=UTRIE2_GET16_FROM_U16_SINGLE_LEAD(other, lead);
         } else {
             value=UTRIE2_GET32_FROM_U16_SINGLE_LEAD(other, lead);
         }
         if(value!=other->initialValue) {
             utrie2_set32ForLeadSurrogateCodeUnit(context.trie, lead, value, pErrorCode);
         }
     }
     if(U_FAILURE(*pErrorCode)) {
         utrie2_close(context.trie);
         context.trie=NULL;
     }
     return context.trie;
 }
 /* Almost the same as utrie2_cloneAsThawed() but copies a UTrie and freezes the clone. */
 U_CAPI UTrie2 * U_EXPORT2
 utrie2_fromUTrie(const UTrie *trie1, uint32_t errorValue, UErrorCode *pErrorCode) {
     NewTrieAndStatus context;
     UChar lead;
     if(U_FAILURE(*pErrorCode)) {
         return NULL;
     }
     if(trie1==NULL) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return NULL;
     }
     context.trie=utrie2_open(trie1->initialValue, errorValue, pErrorCode);
     if(U_FAILURE(*pErrorCode)) {
         return NULL;
     }
     context.exclusiveLimit=TRUE;
     context.errorCode=*pErrorCode;
     utrie_enum(trie1, NULL, copyEnumRange, &context);
     *pErrorCode=context.errorCode;
     for(lead=0xd800; lead<0xdc00; ++lead) {
         uint32_t value;
         if(trie1->data32==NULL) {
             value=UTRIE_GET16_FROM_LEAD(trie1, lead);
         } else {
             value=UTRIE_GET32_FROM_LEAD(trie1, lead);
         }
         if(value!=trie1->initialValue) {
             utrie2_set32ForLeadSurrogateCodeUnit(context.trie, lead, value, pErrorCode);
         }
     }
     if(U_SUCCESS(*pErrorCode)) {
         utrie2_freeze(context.trie,
                       trie1->data32!=NULL ? UTRIE2_32_VALUE_BITS : UTRIE2_16_VALUE_BITS,
                       pErrorCode);
     }
 #ifdef UTRIE2_DEBUG
     if(U_SUCCESS(*pErrorCode)) {
         utrie_printLengths(trie1);
         utrie2_printLengths(context.trie, "fromUTrie");
     }
 #endif
     if(U_FAILURE(*pErrorCode)) {
         utrie2_close(context.trie);
         context.trie=NULL;
     }
     return context.trie;
 }
 static inline UBool
 isInNullBlock(UNewTrie2 *trie, UChar32 c, UBool forLSCP) {
     int32_t i2, block;
     if(U_IS_LEAD(c) && forLSCP) {
         i2=(UTRIE2_LSCP_INDEX_2_OFFSET-(0xd800>>UTRIE2_SHIFT_2))+
             (c>>UTRIE2_SHIFT_2);
     } else {
         i2=trie->index1[c>>UTRIE2_SHIFT_1]+
             ((c>>UTRIE2_SHIFT_2)&UTRIE2_INDEX_2_MASK);
     }
     block=trie->index2[i2];
     return (UBool)(block==trie->dataNullOffset);
 }
 static int32_t
 allocIndex2Block(UNewTrie2 *trie) {
     int32_t newBlock, newTop;
     newBlock=trie->index2Length;
     newTop=newBlock+UTRIE2_INDEX_2_BLOCK_LENGTH;
     if(newTop>LENGTHOF(trie->index2)) {
         /*
          * Should never occur.
          * Either UTRIE2_MAX_BUILD_TIME_INDEX_LENGTH is incorrect,
          * or the code writes more values than should be possible.
          */
         return -1;
     }
     trie->index2Length=newTop;
     uprv_memcpy(trie->index2+newBlock, trie->index2+trie->index2NullOffset, UTRIE2_INDEX_2_BLOCK_LENGTH*4);
     return newBlock;
 }
 static int32_t
 getIndex2Block(UNewTrie2 *trie, UChar32 c, UBool forLSCP) {
     int32_t i1, i2;
     if(U_IS_LEAD(c) && forLSCP) {
         return UTRIE2_LSCP_INDEX_2_OFFSET;
     }
     i1=c>>UTRIE2_SHIFT_1;
     i2=trie->index1[i1];
     if(i2==trie->index2NullOffset) {
         i2=allocIndex2Block(trie);
         if(i2<0) {
             return -1;  /* program error */
         }
         trie->index1[i1]=i2;
     }
     return i2;
 }
 static int32_t
 allocDataBlock(UNewTrie2 *trie, int32_t copyBlock) {
     int32_t newBlock, newTop;
     if(trie->firstFreeBlock!=0) {
         /* get the first free block */
         newBlock=trie->firstFreeBlock;
         trie->firstFreeBlock=-trie->map[newBlock>>UTRIE2_SHIFT_2];
     } else {
         /* get a new block from the high end */
         newBlock=trie->dataLength;
         newTop=newBlock+UTRIE2_DATA_BLOCK_LENGTH;
         if(newTop>trie->dataCapacity) {
             /* out of memory in the data array */
             int32_t capacity;
             uint32_t *data;
             if(trie->dataCapacity<UNEWTRIE2_MEDIUM_DATA_LENGTH) {
                 capacity=UNEWTRIE2_MEDIUM_DATA_LENGTH;
             } else if(trie->dataCapacity<UNEWTRIE2_MAX_DATA_LENGTH) {
                 capacity=UNEWTRIE2_MAX_DATA_LENGTH;
             } else {
                 /*
                  * Should never occur.
                  * Either UNEWTRIE2_MAX_DATA_LENGTH is incorrect,
                  * or the code writes more values than should be possible.
                  */
                 return -1;
             }
             data=(uint32_t *)uprv_malloc(capacity*4);
             if(data==NULL) {
                 return -1;
             }
             uprv_memcpy(data, trie->data, trie->dataLength*4);
             uprv_free(trie->data);
             trie->data=data;
             trie->dataCapacity=capacity;
         }
         trie->dataLength=newTop;
     }
     uprv_memcpy(trie->data+newBlock, trie->data+copyBlock, UTRIE2_DATA_BLOCK_LENGTH*4);
     trie->map[newBlock>>UTRIE2_SHIFT_2]=0;
     return newBlock;
 }
 /* call when the block's reference counter reaches 0 */
 static void
 releaseDataBlock(UNewTrie2 *trie, int32_t block) {
     /* put this block at the front of the free-block chain */
     trie->map[block>>UTRIE2_SHIFT_2]=-trie->firstFreeBlock;
     trie->firstFreeBlock=block;
 }
 static inline UBool
 isWritableBlock(UNewTrie2 *trie, int32_t block) {
     return (UBool)(block!=trie->dataNullOffset && 1==trie->map[block>>UTRIE2_SHIFT_2]);
 }
 static inline void
 setIndex2Entry(UNewTrie2 *trie, int32_t i2, int32_t block) {
     int32_t oldBlock;
     ++trie->map[block>>UTRIE2_SHIFT_2];  /* increment first, in case block==oldBlock! */
     oldBlock=trie->index2[i2];
     if(0 == --trie->map[oldBlock>>UTRIE2_SHIFT_2]) {
         releaseDataBlock(trie, oldBlock);
     }
     trie->index2[i2]=block;
 }
 /**
  * No error checking for illegal arguments.
  *
  * @return -1 if no new data block available (out of memory in data array)
  * @internal
  */
 static int32_t
 getDataBlock(UNewTrie2 *trie, UChar32 c, UBool forLSCP) {
     int32_t i2, oldBlock, newBlock;
     i2=getIndex2Block(trie, c, forLSCP);
     if(i2<0) {
         return -1;  /* program error */
     }
     i2+=(c>>UTRIE2_SHIFT_2)&UTRIE2_INDEX_2_MASK;
     oldBlock=trie->index2[i2];
     if(isWritableBlock(trie, oldBlock)) {
         return oldBlock;
     }
     /* allocate a new data block */
     newBlock=allocDataBlock(trie, oldBlock);
     if(newBlock<0) {
         /* out of memory in the data array */
         return -1;
     }
     setIndex2Entry(trie, i2, newBlock);
     return newBlock;
 }
 /**
  * @return TRUE if the value was successfully set
  */
 static void
 set32(UNewTrie2 *trie,
       UChar32 c, UBool forLSCP, uint32_t value,
       UErrorCode *pErrorCode) {
     int32_t block;
     if(trie==NULL || trie->isCompacted) {
         *pErrorCode=U_NO_WRITE_PERMISSION;
         return;
     }
     block=getDataBlock(trie, c, forLSCP);
     if(block<0) {
         *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     trie->data[block+(c&UTRIE2_DATA_MASK)]=value;
 }
 U_CAPI void U_EXPORT2
 utrie2_set32(UTrie2 *trie, UChar32 c, uint32_t value, UErrorCode *pErrorCode) {
     if(U_FAILURE(*pErrorCode)) {
         return;
     }
     if((uint32_t)c>0x10ffff) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return;
     }
     set32(trie->newTrie, c, TRUE, value, pErrorCode);
 }
 U_CAPI void U_EXPORT2
 utrie2_set32ForLeadSurrogateCodeUnit(UTrie2 *trie,
                                      UChar32 c, uint32_t value,
                                      UErrorCode *pErrorCode) {
     if(U_FAILURE(*pErrorCode)) {
         return;
     }
     if(!U_IS_LEAD(c)) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return;
     }
     set32(trie->newTrie, c, FALSE, value, pErrorCode);
 }
 static void
 writeBlock(uint32_t *block, uint32_t value) {
     uint32_t *limit=block+UTRIE2_DATA_BLOCK_LENGTH;
     while(block<limit) {
         *block++=value;
     }
 }
 /**
  * initialValue is ignored if overwrite=TRUE
  * @internal
  */
 static void
 fillBlock(uint32_t *block, UChar32 start, UChar32 limit,
           uint32_t value, uint32_t initialValue, UBool overwrite) {
     uint32_t *pLimit;
     pLimit=block+limit;
     block+=start;
     if(overwrite) {
         while(block<pLimit) {
             *block++=value;
         }
     } else {
         while(block<pLimit) {
             if(*block==initialValue) {
                 *block=value;
             }
             ++block;
         }
     }
 }
 U_CAPI void U_EXPORT2
 utrie2_setRange32(UTrie2 *trie,
                   UChar32 start, UChar32 end,
                   uint32_t value, UBool overwrite,
                   UErrorCode *pErrorCode) {
     /*
      * repeat value in [start..end]
      * mark index values for repeat-data blocks by setting bit 31 of the index values
      * fill around existing values if any, if(overwrite)
      */
     UNewTrie2 *newTrie;
     int32_t block, rest, repeatBlock;
     UChar32 limit;
     if(U_FAILURE(*pErrorCode)) {
         return;
     }
     if((uint32_t)start>0x10ffff || (uint32_t)end>0x10ffff || start>end) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return;
     }
     newTrie=trie->newTrie;
     if(newTrie==NULL || newTrie->isCompacted) {
         *pErrorCode=U_NO_WRITE_PERMISSION;
         return;
     }
     if(!overwrite && value==newTrie->initialValue) {
         return; /* nothing to do */
     }
     limit=end+1;
     if(start&UTRIE2_DATA_MASK) {
         UChar32 nextStart;
         /* set partial block at [start..following block boundary[ */
         block=getDataBlock(newTrie, start, TRUE);
         if(block<0) {
             *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
             return;
         }
         nextStart=(start+UTRIE2_DATA_BLOCK_LENGTH)&~UTRIE2_DATA_MASK;
         if(nextStart<=limit) {
             fillBlock(newTrie->data+block, start&UTRIE2_DATA_MASK, UTRIE2_DATA_BLOCK_LENGTH,
                       value, newTrie->initialValue, overwrite);
             start=nextStart;
         } else {
             fillBlock(newTrie->data+block, start&UTRIE2_DATA_MASK, limit&UTRIE2_DATA_MASK,
                       value, newTrie->initialValue, overwrite);
             return;
         }
     }
     /* number of positions in the last, partial block */
     rest=limit&UTRIE2_DATA_MASK;
     /* round down limit to a block boundary */
     limit&=~UTRIE2_DATA_MASK;
     /* iterate over all-value blocks */
     if(value==newTrie->initialValue) {
         repeatBlock=newTrie->dataNullOffset;
     } else {
         repeatBlock=-1;
     }
     while(start<limit) {
         int32_t i2;
         UBool setRepeatBlock=FALSE;
         if(value==newTrie->initialValue && isInNullBlock(newTrie, start, TRUE)) {
             start+=UTRIE2_DATA_BLOCK_LENGTH; /* nothing to do */
             continue;
         }
         /* get index value */
         i2=getIndex2Block(newTrie, start, TRUE);
         if(i2<0) {
             *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
             return;
         }
         i2+=(start>>UTRIE2_SHIFT_2)&UTRIE2_INDEX_2_MASK;
         block=newTrie->index2[i2];
         if(isWritableBlock(newTrie, block)) {
             /* already allocated */
             if(overwrite && block>=UNEWTRIE2_DATA_0800_OFFSET) {
                 /*
                  * We overwrite all values, and it's not a
                  * protected (ASCII-linear or 2-byte UTF-8) block:
                  * replace with the repeatBlock.
                  */
                 setRepeatBlock=TRUE;
             } else {
                 /* !overwrite, or protected block: just write the values into this block */
                 fillBlock(newTrie->data+block,
 , UTRIE2_DATA_BLOCK_LENGTH,
                           value, newTrie->initialValue, overwrite);
             }
         } else if(newTrie->data[block]!=value && (overwrite || block==newTrie->dataNullOffset)) {
             /*
              * Set the repeatBlock instead of the null block or previous repeat block:
              *
              * If !isWritableBlock() then all entries in the block have the same value
              * because it's the null block or a range block (the repeatBlock from a previous
              * call to utrie2_setRange32()).
              * No other blocks are used multiple times before compacting.
              *
              * The null block is the only non-writable block with the initialValue because
              * of the repeatBlock initialization above. (If value==initialValue, then
              * the repeatBlock will be the null data block.)
              *
              * We set our repeatBlock if the desired value differs from the block's value,
              * and if we overwrite any data or if the data is all initial values
              * (which is the same as the block being the null block, see above).
              */
             setRepeatBlock=TRUE;
         }
         if(setRepeatBlock) {
             if(repeatBlock>=0) {
                 setIndex2Entry(newTrie, i2, repeatBlock);
             } else {
                 /* create and set and fill the repeatBlock */
                 repeatBlock=getDataBlock(newTrie, start, TRUE);
                 if(repeatBlock<0) {
                     *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
                     return;
                 }
                 writeBlock(newTrie->data+repeatBlock, value);
             }
         }
         start+=UTRIE2_DATA_BLOCK_LENGTH;
     }
     if(rest>0) {
         /* set partial block at [last block boundary..limit[ */
         block=getDataBlock(newTrie, start, TRUE);
         if(block<0) {
             *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
             return;
         }
         fillBlock(newTrie->data+block, 0, rest, value, newTrie->initialValue, overwrite);
     }
     return;
 }
 /* compaction --------------------------------------------------------------- */
 static inline UBool
 equal_int32(const int32_t *s, const int32_t *t, int32_t length) {
     while(length>0 && *s==*t) {
         ++s;
         ++t;
         --length;
     }
     return (UBool)(length==0);
 }
 static inline UBool
 equal_uint32(const uint32_t *s, const uint32_t *t, int32_t length) {
     while(length>0 && *s==*t) {
         ++s;
         ++t;
         --length;
     }
     return (UBool)(length==0);
 }
 static int32_t
 findSameIndex2Block(const int32_t *idx, int32_t index2Length, int32_t otherBlock) {
     int32_t block;
     /* ensure that we do not even partially get past index2Length */
     index2Length-=UTRIE2_INDEX_2_BLOCK_LENGTH;
     for(block=0; block<=index2Length; ++block) {
         if(equal_int32(idx+block, idx+otherBlock, UTRIE2_INDEX_2_BLOCK_LENGTH)) {
             return block;
         }
     }
     return -1;
 }
 static int32_t
 findSameDataBlock(const uint32_t *data, int32_t dataLength, int32_t otherBlock, int32_t blockLength) {
     int32_t block;
     /* ensure that we do not even partially get past dataLength */
     dataLength-=blockLength;
     for(block=0; block<=dataLength; block+=UTRIE2_DATA_GRANULARITY) {
         if(equal_uint32(data+block, data+otherBlock, blockLength)) {
             return block;
         }
     }
     return -1;
 }
 /*
  * Find the start of the last range in the trie by enumerating backward.
  * Indexes for supplementary code points higher than this will be omitted.
  */
 static UChar32
 findHighStart(UNewTrie2 *trie, uint32_t highValue) {
     const uint32_t *data32;
     uint32_t value, initialValue;
     UChar32 c, prev;
     int32_t i1, i2, j, i2Block, prevI2Block, index2NullOffset, block, prevBlock, nullBlock;
     data32=trie->data;
     initialValue=trie->initialValue;
     index2NullOffset=trie->index2NullOffset;
     nullBlock=trie->dataNullOffset;
     /* set variables for previous range */
     if(highValue==initialValue) {
         prevI2Block=index2NullOffset;
         prevBlock=nullBlock;
     } else {
         prevI2Block=-1;
         prevBlock=-1;
     }
     prev=0x110000;
     /* enumerate index-2 blocks */
     i1=UNEWTRIE2_INDEX_1_LENGTH;
     c=prev;
     while(c>0) {
         i2Block=trie->index1[--i1];
         if(i2Block==prevI2Block) {
             /* the index-2 block is the same as the previous one, and filled with highValue */
             c-=UTRIE2_CP_PER_INDEX_1_ENTRY;
             continue;
         }
         prevI2Block=i2Block;
         if(i2Block==index2NullOffset) {
             /* this is the null index-2 block */
             if(highValue!=initialValue) {
                 return c;
             }
             c-=UTRIE2_CP_PER_INDEX_1_ENTRY;
         } else {
             /* enumerate data blocks for one index-2 block */
             for(i2=UTRIE2_INDEX_2_BLOCK_LENGTH; i2>0;) {
                 block=trie->index2[i2Block+ --i2];
                 if(block==prevBlock) {
                     /* the block is the same as the previous one, and filled with highValue */
                     c-=UTRIE2_DATA_BLOCK_LENGTH;
                     continue;
                 }
                 prevBlock=block;
                 if(block==nullBlock) {
                     /* this is the null data block */
                     if(highValue!=initialValue) {
                         return c;
                     }
                     c-=UTRIE2_DATA_BLOCK_LENGTH;
                 } else {
                     for(j=UTRIE2_DATA_BLOCK_LENGTH; j>0;) {
                         value=data32[block+ --j];
                         if(value!=highValue) {
                             return c;
                         }
                         --c;
                     }
                 }
             }
         }
     }
     /* deliver last range */
     return 0;
 }
 /*
  * Compact a build-time trie.
  *
  * The compaction
  * - removes blocks that are identical with earlier ones
  * - overlaps adjacent blocks as much as possible (if overlap==TRUE)
  * - moves blocks in steps of the data granularity
  * - moves and overlaps blocks that overlap with multiple values in the overlap region
  *
  * It does not
  * - try to move and overlap blocks that are not already adjacent
  */
 static void
 compactData(UNewTrie2 *trie) {
     int32_t start, newStart, movedStart;
     int32_t blockLength, overlap;
     int32_t i, mapIndex, blockCount;
     /* do not compact linear-ASCII data */
     newStart=UTRIE2_DATA_START_OFFSET;
     for(start=0, i=0; start<newStart; start+=UTRIE2_DATA_BLOCK_LENGTH, ++i) {
         trie->map[i]=start;
     }
     /*
      * Start with a block length of 64 for 2-byte UTF-8,
      * then switch to UTRIE2_DATA_BLOCK_LENGTH.
      */
     blockLength=64;
     blockCount=blockLength>>UTRIE2_SHIFT_2;
     for(start=newStart; start<trie->dataLength;) {
         /*
          * start: index of first entry of current block
          * newStart: index where the current block is to be moved
          *           (right after current end of already-compacted data)
          */
         if(start==UNEWTRIE2_DATA_0800_OFFSET) {
             blockLength=UTRIE2_DATA_BLOCK_LENGTH;
             blockCount=1;
         }
         /* skip blocks that are not used */
         if(trie->map[start>>UTRIE2_SHIFT_2]<=0) {
             /* advance start to the next block */
             start+=blockLength;
             /* leave newStart with the previous block! */
             continue;
         }
         /* search for an identical block */
         if( (movedStart=findSameDataBlock(trie->data, newStart, start, blockLength))
              >=0
         ) {
             /* found an identical block, set the other block's index value for the current block */
             for(i=blockCount, mapIndex=start>>UTRIE2_SHIFT_2; i>0; --i) {
                 trie->map[mapIndex++]=movedStart;
                 movedStart+=UTRIE2_DATA_BLOCK_LENGTH;
             }
             /* advance start to the next block */
             start+=blockLength;
             /* leave newStart with the previous block! */
             continue;
         }
         /* see if the beginning of this block can be overlapped with the end of the previous block */
         /* look for maximum overlap (modulo granularity) with the previous, adjacent block */
         for(overlap=blockLength-UTRIE2_DATA_GRANULARITY;
             overlap>0 && !equal_uint32(trie->data+(newStart-overlap), trie->data+start, overlap);
             overlap-=UTRIE2_DATA_GRANULARITY) {}
         if(overlap>0 || newStart<start) {
             /* some overlap, or just move the whole block */
             movedStart=newStart-overlap;
             for(i=blockCount, mapIndex=start>>UTRIE2_SHIFT_2; i>0; --i) {
                 trie->map[mapIndex++]=movedStart;
                 movedStart+=UTRIE2_DATA_BLOCK_LENGTH;
             }
             /* move the non-overlapping indexes to their new positions */
             start+=overlap;
             for(i=blockLength-overlap; i>0; --i) {
                 trie->data[newStart++]=trie->data[start++];
             }
         } else /* no overlap && newStart==start */ {
             for(i=blockCount, mapIndex=start>>UTRIE2_SHIFT_2; i>0; --i) {
                 trie->map[mapIndex++]=start;
                 start+=UTRIE2_DATA_BLOCK_LENGTH;
             }
             newStart=start;
         }
     }
     /* now adjust the index-2 table */
     for(i=0; i<trie->index2Length; ++i) {
         if(i==UNEWTRIE2_INDEX_GAP_OFFSET) {
             /* Gap indexes are invalid (-1). Skip over the gap. */
             i+=UNEWTRIE2_INDEX_GAP_LENGTH;
         }
         trie->index2[i]=trie->map[trie->index2[i]>>UTRIE2_SHIFT_2];
     }
     trie->dataNullOffset=trie->map[trie->dataNullOffset>>UTRIE2_SHIFT_2];
     /* ensure dataLength alignment */
     while((newStart&(UTRIE2_DATA_GRANULARITY-1))!=0) {
         trie->data[newStart++]=trie->initialValue;
     }
 #ifdef UTRIE2_DEBUG
     /* we saved some space */
     printf("compacting UTrie2: count of 32-bit data words %lu->%lu\n",
             (long)trie->dataLength, (long)newStart);
 #endif
     trie->dataLength=newStart;
 }
 static void
 compactIndex2(UNewTrie2 *trie) {
     int32_t i, start, newStart, movedStart, overlap;
     /* do not compact linear-BMP index-2 blocks */
     newStart=UTRIE2_INDEX_2_BMP_LENGTH;
     for(start=0, i=0; start<newStart; start+=UTRIE2_INDEX_2_BLOCK_LENGTH, ++i) {
         trie->map[i]=start;
     }
     /* Reduce the index table gap to what will be needed at runtime. */
     newStart+=UTRIE2_UTF8_2B_INDEX_2_LENGTH+((trie->highStart-0x10000)>>UTRIE2_SHIFT_1);
     for(start=UNEWTRIE2_INDEX_2_NULL_OFFSET; start<trie->index2Length;) {
         /*
          * start: index of first entry of current block
          * newStart: index where the current block is to be moved
          *           (right after current end of already-compacted data)
          */
         /* search for an identical block */
         if( (movedStart=findSameIndex2Block(trie->index2, newStart, start))
              >=0
         ) {
             /* found an identical block, set the other block's index value for the current block */
             trie->map[start>>UTRIE2_SHIFT_1_2]=movedStart;
             /* advance start to the next block */
             start+=UTRIE2_INDEX_2_BLOCK_LENGTH;
             /* leave newStart with the previous block! */
             continue;
         }
         /* see if the beginning of this block can be overlapped with the end of the previous block */
         /* look for maximum overlap with the previous, adjacent block */
         for(overlap=UTRIE2_INDEX_2_BLOCK_LENGTH-1;
             overlap>0 && !equal_int32(trie->index2+(newStart-overlap), trie->index2+start, overlap);
             --overlap) {}
         if(overlap>0 || newStart<start) {
             /* some overlap, or just move the whole block */
             trie->map[start>>UTRIE2_SHIFT_1_2]=newStart-overlap;
             /* move the non-overlapping indexes to their new positions */
             start+=overlap;
             for(i=UTRIE2_INDEX_2_BLOCK_LENGTH-overlap; i>0; --i) {
                 trie->index2[newStart++]=trie->index2[start++];
             }
         } else /* no overlap && newStart==start */ {
             trie->map[start>>UTRIE2_SHIFT_1_2]=start;
             start+=UTRIE2_INDEX_2_BLOCK_LENGTH;
             newStart=start;
         }
     }
     /* now adjust the index-1 table */
     for(i=0; i<UNEWTRIE2_INDEX_1_LENGTH; ++i) {
         trie->index1[i]=trie->map[trie->index1[i]>>UTRIE2_SHIFT_1_2];
     }
     trie->index2NullOffset=trie->map[trie->index2NullOffset>>UTRIE2_SHIFT_1_2];
     /*
      * Ensure data table alignment:
      * Needs to be granularity-aligned for 16-bit trie
      * (so that dataMove will be down-shiftable),
      * and 2-aligned for uint32_t data.
      */
     while((newStart&((UTRIE2_DATA_GRANULARITY-1)|1))!=0) {
         /* Arbitrary value: 0x3fffc not possible for real data. */
         trie->index2[newStart++]=(int32_t)0xffff<<UTRIE2_INDEX_SHIFT;
     }
 #ifdef UTRIE2_DEBUG
     /* we saved some space */
     printf("compacting UTrie2: count of 16-bit index-2 words %lu->%lu\n",
             (long)trie->index2Length, (long)newStart);
 #endif
     trie->index2Length=newStart;
 }
 static void
 compactTrie(UTrie2 *trie, UErrorCode *pErrorCode) {
     UNewTrie2 *newTrie;
     UChar32 highStart, suppHighStart;
     uint32_t highValue;
     newTrie=trie->newTrie;
     /* find highStart and round it up */
     highValue=utrie2_get32(trie, 0x10ffff);
     highStart=findHighStart(newTrie, highValue);
     highStart=(highStart+(UTRIE2_CP_PER_INDEX_1_ENTRY-1))&~(UTRIE2_CP_PER_INDEX_1_ENTRY-1);
     if(highStart==0x110000) {
         highValue=trie->errorValue;
     }
     /*
      * Set trie->highStart only after utrie2_get32(trie, highStart).
      * Otherwise utrie2_get32(trie, highStart) would try to read the highValue.
      */
     trie->highStart=newTrie->highStart=highStart;
 #ifdef UTRIE2_DEBUG
     printf("UTrie2: highStart U+%04lx  highValue 0x%lx  initialValue 0x%lx\n",
             (long)highStart, (long)highValue, (long)trie->initialValue);
 #endif
     if(highStart<0x110000) {
         /* Blank out [highStart..10ffff] to release associated data blocks. */
         suppHighStart= highStart<=0x10000 ? 0x10000 : highStart;
         utrie2_setRange32(trie, suppHighStart, 0x10ffff, trie->initialValue, TRUE, pErrorCode);
         if(U_FAILURE(*pErrorCode)) {
             return;
         }
     }
     compactData(newTrie);
     if(highStart>0x10000) {
         compactIndex2(newTrie);
 #ifdef UTRIE2_DEBUG
     } else {
         printf("UTrie2: highStart U+%04lx  count of 16-bit index-2 words %lu->%lu\n",
                 (long)highStart, (long)trie->newTrie->index2Length, (long)UTRIE2_INDEX_1_OFFSET);
 #endif
     }
     /*
      * Store the highValue in the data array and round up the dataLength.
      * Must be done after compactData() because that assumes that dataLength
      * is a multiple of UTRIE2_DATA_BLOCK_LENGTH.
      */
     newTrie->data[newTrie->dataLength++]=highValue;
     while((newTrie->dataLength&(UTRIE2_DATA_GRANULARITY-1))!=0) {
         newTrie->data[newTrie->dataLength++]=trie->initialValue;
     }
     newTrie->isCompacted=TRUE;
 }
 /* serialization ------------------------------------------------------------ */
 /**
  * Maximum length of the runtime index array.
  * Limited by its own 16-bit index values, and by uint16_t UTrie2Header.indexLength.
  * (The actual maximum length is lower,
  * (0x110000>>UTRIE2_SHIFT_2)+UTRIE2_UTF8_2B_INDEX_2_LENGTH+UTRIE2_MAX_INDEX_1_LENGTH.)
  */
 #define UTRIE2_MAX_INDEX_LENGTH 0xffff
 /**
  * Maximum length of the runtime data array.
  * Limited by 16-bit index values that are left-shifted by UTRIE2_INDEX_SHIFT,
  * and by uint16_t UTrie2Header.shiftedDataLength.
  */
 #define UTRIE2_MAX_DATA_LENGTH (0xffff<<UTRIE2_INDEX_SHIFT)
 /* Compact and internally serialize the trie. */
 U_CAPI void U_EXPORT2
 utrie2_freeze(UTrie2 *trie, UTrie2ValueBits valueBits, UErrorCode *pErrorCode) {
     UNewTrie2 *newTrie;
     UTrie2Header *header;
     uint32_t *p;
     uint16_t *dest16;
     int32_t i, length;
     int32_t allIndexesLength;
     int32_t dataMove;  /* >0 if the data is moved to the end of the index array */
     UChar32 highStart;
     /* argument check */
     if(U_FAILURE(*pErrorCode)) {
         return;
     }
     if( trie==NULL ||
         valueBits<0 || UTRIE2_COUNT_VALUE_BITS<=valueBits
     ) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return;
     }
     newTrie=trie->newTrie;
     if(newTrie==NULL) {
         /* already frozen */
         UTrie2ValueBits frozenValueBits=
             trie->data16!=NULL ? UTRIE2_16_VALUE_BITS : UTRIE2_32_VALUE_BITS;
         if(valueBits!=frozenValueBits) {
             *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         }
         return;
     }
     /* compact if necessary */
     if(!newTrie->isCompacted) {
         compactTrie(trie, pErrorCode);
         if(U_FAILURE(*pErrorCode)) {
             return;
         }
     }
     highStart=trie->highStart;
     if(highStart<=0x10000) {
         allIndexesLength=UTRIE2_INDEX_1_OFFSET;
     } else {
         allIndexesLength=newTrie->index2Length;
     }
     if(valueBits==UTRIE2_16_VALUE_BITS) {
         dataMove=allIndexesLength;
     } else {
         dataMove=0;
     }
     /* are indexLength and dataLength within limits? */
     if( /* for unshifted indexLength */
         allIndexesLength>UTRIE2_MAX_INDEX_LENGTH ||
         /* for unshifted dataNullOffset */
         (dataMove+newTrie->dataNullOffset)>0xffff ||
         /* for unshifted 2-byte UTF-8 index-2 values */
         (dataMove+UNEWTRIE2_DATA_0800_OFFSET)>0xffff ||
         /* for shiftedDataLength */
         (dataMove+newTrie->dataLength)>UTRIE2_MAX_DATA_LENGTH
     ) {
         *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
         return;
     }
     /* calculate the total serialized length */
     length=sizeof(UTrie2Header)+allIndexesLength*2;
     if(valueBits==UTRIE2_16_VALUE_BITS) {
         length+=newTrie->dataLength*2;
     } else {
         length+=newTrie->dataLength*4;
     }
     trie->memory=uprv_malloc(length);
     if(trie->memory==NULL) {
         *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     trie->length=length;
     trie->isMemoryOwned=TRUE;
     trie->indexLength=allIndexesLength;
     trie->dataLength=newTrie->dataLength;
     if(highStart<=0x10000) {
         trie->index2NullOffset=0xffff;
     } else {
         trie->index2NullOffset=UTRIE2_INDEX_2_OFFSET+newTrie->index2NullOffset;
     }
     trie->dataNullOffset=(uint16_t)(dataMove+newTrie->dataNullOffset);
     trie->highValueIndex=dataMove+trie->dataLength-UTRIE2_DATA_GRANULARITY;
     /* set the header fields */
     header=(UTrie2Header *)trie->memory;
     header->signature=UTRIE2_SIG; /* "Tri2" */
     header->options=(uint16_t)valueBits;
     header->indexLength=(uint16_t)trie->indexLength;
     header->shiftedDataLength=(uint16_t)(trie->dataLength>>UTRIE2_INDEX_SHIFT);
     header->index2NullOffset=trie->index2NullOffset;
     header->dataNullOffset=trie->dataNullOffset;
     header->shiftedHighStart=(uint16_t)(highStart>>UTRIE2_SHIFT_1);
     /* fill the index and data arrays */
     dest16=(uint16_t *)(header+1);
     trie->index=dest16;
     /* write the index-2 array values shifted right by UTRIE2_INDEX_SHIFT, after adding dataMove */
     p=(uint32_t *)newTrie->index2;
     for(i=UTRIE2_INDEX_2_BMP_LENGTH; i>0; --i) {
         *dest16++=(uint16_t)((dataMove + *p++)>>UTRIE2_INDEX_SHIFT);
     }
     /* write UTF-8 2-byte index-2 values, not right-shifted */
     for(i=0; i<(0xc2-0xc0); ++i) {                                  /* C0..C1 */
         *dest16++=(uint16_t)(dataMove+UTRIE2_BAD_UTF8_DATA_OFFSET);
     }
     for(; i<(0xe0-0xc0); ++i) {                                     /* C2..DF */
         *dest16++=(uint16_t)(dataMove+newTrie->index2[i<<(6-UTRIE2_SHIFT_2)]);
     }
     if(highStart>0x10000) {
         int32_t index1Length=(highStart-0x10000)>>UTRIE2_SHIFT_1;
         int32_t index2Offset=UTRIE2_INDEX_2_BMP_LENGTH+UTRIE2_UTF8_2B_INDEX_2_LENGTH+index1Length;
         /* write 16-bit index-1 values for supplementary code points */
         p=(uint32_t *)newTrie->index1+UTRIE2_OMITTED_BMP_INDEX_1_LENGTH;
         for(i=index1Length; i>0; --i) {
             *dest16++=(uint16_t)(UTRIE2_INDEX_2_OFFSET + *p++);
         }
         /*
          * write the index-2 array values for supplementary code points,
          * shifted right by UTRIE2_INDEX_SHIFT, after adding dataMove
          */
         p=(uint32_t *)newTrie->index2+index2Offset;
         for(i=newTrie->index2Length-index2Offset; i>0; --i) {
             *dest16++=(uint16_t)((dataMove + *p++)>>UTRIE2_INDEX_SHIFT);
         }
     }
     /* write the 16/32-bit data array */
     switch(valueBits) {
     case UTRIE2_16_VALUE_BITS:
         /* write 16-bit data values */
         trie->data16=dest16;
         trie->data32=NULL;
         p=newTrie->data;
         for(i=newTrie->dataLength; i>0; --i) {
             *dest16++=(uint16_t)*p++;
         }
         break;
     case UTRIE2_32_VALUE_BITS:
         /* write 32-bit data values */
         trie->data16=NULL;
         trie->data32=(uint32_t *)dest16;
         uprv_memcpy(dest16, newTrie->data, newTrie->dataLength*4);
         break;
     default:
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return;
     }
     /* Delete the UNewTrie2. */
     uprv_free(newTrie->data);
     uprv_free(newTrie);
     trie->newTrie=NULL;
 }
 U_CAPI UBool U_EXPORT2
 utrie2_isFrozen(const UTrie2 *trie) {
     return (UBool)(trie->newTrie==NULL);
 }
 U_CAPI int32_t U_EXPORT2
 utrie2_serialize(UTrie2 *trie,
                  void *data, int32_t capacity,
                  UErrorCode *pErrorCode) {
     /* argument check */
     if(U_FAILURE(*pErrorCode)) {
         return 0;
     }
     if( trie==NULL || trie->memory==NULL || trie->newTrie!=NULL ||
         capacity<0 || (capacity>0 && (data==NULL || (U_POINTER_MASK_LSB(data, 3)!=0)))
     ) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }
     if(capacity>=trie->length) {
         uprv_memcpy(data, trie->memory, trie->length);
     } else {
         *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
     }
     return trie->length;
 }
 /*
  * This is here to avoid a dependency from utrie2.cpp on utrie.c.
  * This file already depends on utrie.c.
  * Otherwise, this should be in utrie2.cpp right after utrie2_swap().
  */
 U_CAPI int32_t U_EXPORT2
 utrie2_swapAnyVersion(const UDataSwapper *ds,
                       const void *inData, int32_t length, void *outData,
                       UErrorCode *pErrorCode) {
     if(U_SUCCESS(*pErrorCode)) {
         switch(utrie2_getVersion(inData, length, TRUE)) {
         case 1:
             return utrie_swap(ds, inData, length, outData, pErrorCode);
         case 2:
             return utrie2_swap(ds, inData, length, outData, pErrorCode);
         default:
             *pErrorCode=U_INVALID_FORMAT_ERROR;
             return 0;
         }
     }
     return 0;
 }

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intl/icu/source/common/utrie2_builder.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/utrie2_builder.cpp