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

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

intl/icu/source/common/utrie.h

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

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

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

 /*
 ******************************************************************************
 *
 *   Copyright (C) 2001-2011, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 ******************************************************************************
 *   file name:  utrie.h
 *   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 2001nov08
 *   created by: Markus W. Scherer
 */
 #ifndef __UTRIE_H__
 #define __UTRIE_H__
 #include "unicode/utypes.h"
 #include "unicode/utf16.h"
 #include "udataswp.h"
 U_CDECL_BEGIN
 /**
  * \file
  *
  * This is a common implementation of a "folded" trie.
  * It is a kind of compressed, serializable table of 16- or 32-bit values associated with
  * Unicode code points (0..0x10ffff).
  *
  * This implementation is optimized for getting values while walking forward
  * through a UTF-16 string.
  * Therefore, the simplest and fastest access macros are the
  * _FROM_LEAD() and _FROM_OFFSET_TRAIL() macros.
  *
  * The _FROM_BMP() macros are a little more complicated; they get values
  * even for lead surrogate code _points_, while the _FROM_LEAD() macros
  * get special "folded" values for lead surrogate code _units_ if
  * there is relevant data associated with them.
  * From such a folded value, an offset needs to be extracted to supply
  * to the _FROM_OFFSET_TRAIL() macros.
  *
  * Most of the more complex (and more convenient) functions/macros call a callback function
  * to get that offset from the folded value for a lead surrogate unit.
  */
 /**
  * Trie constants, defining shift widths, index array lengths, etc.
  */
 enum {
     /** Shift size for shifting right the input index. 1..9 */
     UTRIE_SHIFT=5,
     /** Number of data values in a stage 2 (data array) block. 2, 4, 8, .., 0x200 */
     UTRIE_DATA_BLOCK_LENGTH=1<<UTRIE_SHIFT,
     /** Mask for getting the lower bits from the input index. */
     UTRIE_MASK=UTRIE_DATA_BLOCK_LENGTH-1,
     /**
      * Lead surrogate code points' index displacement in the index array.
      * 0x10000-0xd800=0x2800
      */
     UTRIE_LEAD_INDEX_DISP=0x2800>>UTRIE_SHIFT,
     /**
      * Shift size for shifting left the index array values.
      * Increases possible data size with 16-bit index values at the cost
      * of compactability.
      * This requires blocks of stage 2 data to be aligned by UTRIE_DATA_GRANULARITY.
      * 0..UTRIE_SHIFT
      */
     UTRIE_INDEX_SHIFT=2,
     /** The alignment size of a stage 2 data block. Also the granularity for compaction. */
     UTRIE_DATA_GRANULARITY=1<<UTRIE_INDEX_SHIFT,
     /** Number of bits of a trail surrogate that are used in index table lookups. */
     UTRIE_SURROGATE_BLOCK_BITS=10-UTRIE_SHIFT,
     /**
      * Number of index (stage 1) entries per lead surrogate.
      * Same as number of index entries for 1024 trail surrogates,
      * ==0x400>>UTRIE_SHIFT
      */
     UTRIE_SURROGATE_BLOCK_COUNT=(1<<UTRIE_SURROGATE_BLOCK_BITS),
     /** Length of the BMP portion of the index (stage 1) array. */
     UTRIE_BMP_INDEX_LENGTH=0x10000>>UTRIE_SHIFT
 };
 /**
  * Length of the index (stage 1) array before folding.
  * Maximum number of Unicode code points (0x110000) shifted right by UTRIE_SHIFT.
  */
 #define UTRIE_MAX_INDEX_LENGTH (0x110000>>UTRIE_SHIFT)
 /**
  * Maximum length of the runtime data (stage 2) array.
  * Limited by 16-bit index values that are left-shifted by UTRIE_INDEX_SHIFT.
  */
 #define UTRIE_MAX_DATA_LENGTH (0x10000<<UTRIE_INDEX_SHIFT)
 /**
  * Maximum length of the build-time data (stage 2) array.
  * The maximum length is 0x110000+UTRIE_DATA_BLOCK_LENGTH+0x400.
  * (Number of Unicode code points + one all-initial-value block +
  *  possible duplicate entries for 1024 lead surrogates.)
  */
 #define UTRIE_MAX_BUILD_TIME_DATA_LENGTH (0x110000+UTRIE_DATA_BLOCK_LENGTH+0x400)
 /**
  * Number of bytes for a dummy trie.
  * A dummy trie is an empty runtime trie, used when a real data trie cannot
  * be loaded.
  * The number of bytes works for Latin-1-linear tries with 32-bit data
  * (worst case).
  *
  * Calculation:
  *   BMP index + 1 index block for lead surrogate code points +
  *   Latin-1-linear array + 1 data block for lead surrogate code points
  *
  * Latin-1: if(UTRIE_SHIFT<=8) { 256 } else { included in first data block }
  *
  * @see utrie_unserializeDummy
  */
 #define UTRIE_DUMMY_SIZE ((UTRIE_BMP_INDEX_LENGTH+UTRIE_SURROGATE_BLOCK_COUNT)*2+(UTRIE_SHIFT<=8?256:UTRIE_DATA_BLOCK_LENGTH)*4+UTRIE_DATA_BLOCK_LENGTH*4)
 /**
  * Runtime UTrie callback function.
  * Extract from a lead surrogate's data the
  * index array offset of the indexes for that lead surrogate.
  *
  * @param data data value for a surrogate from the trie, including the folding offset
  * @return offset>=UTRIE_BMP_INDEX_LENGTH, or 0 if there is no data for the lead surrogate
  */
 typedef int32_t U_CALLCONV
 UTrieGetFoldingOffset(uint32_t data);
 /**
  * Run-time Trie structure.
  *
  * Either the data table is 16 bits wide and accessed via the index
  * pointer, with each index item increased by indexLength;
  * in this case, data32==NULL.
  *
  * Or the data table is 32 bits wide and accessed via the data32 pointer.
  */
 struct UTrie {
     const uint16_t *index;
     const uint32_t *data32; /* NULL if 16b data is used via index */
     /**
      * This function is not used in _FROM_LEAD, _FROM_BMP, and _FROM_OFFSET_TRAIL macros.
      * If convenience macros like _GET16 or _NEXT32 are used, this function must be set.
      *
      * utrie_unserialize() sets a default function which simply returns
      * the lead surrogate's value itself - which is the inverse of the default
      * folding function used by utrie_serialize().
      *
      * @see UTrieGetFoldingOffset
      */
     UTrieGetFoldingOffset *getFoldingOffset;
     int32_t indexLength, dataLength;
     uint32_t initialValue;
     UBool isLatin1Linear;
 };
 #ifndef __UTRIE2_H__
 typedef struct UTrie UTrie;
 #endif
 /** Internal trie getter from an offset (0 if c16 is a BMP/lead units) and a 16-bit unit */
 #define _UTRIE_GET_RAW(trie, data, offset, c16) \
     (trie)->data[ \
         ((int32_t)((trie)->index[(offset)+((c16)>>UTRIE_SHIFT)])<<UTRIE_INDEX_SHIFT)+ \
         ((c16)&UTRIE_MASK) \
     ]
 /** Internal trie getter from a pair of surrogates */
 #define _UTRIE_GET_FROM_PAIR(trie, data, c, c2, result, resultType) { \
     int32_t __offset; \
 \
     /* get data for lead surrogate */ \
     (result)=_UTRIE_GET_RAW((trie), data, 0, (c)); \
     __offset=(trie)->getFoldingOffset(result); \
 \
     /* get the real data from the folded lead/trail units */ \
     if(__offset>0) { \
         (result)=_UTRIE_GET_RAW((trie), data, __offset, (c2)&0x3ff); \
     } else { \
         (result)=(resultType)((trie)->initialValue); \
     } \
 }
 /** Internal trie getter from a BMP code point, treating a lead surrogate as a normal code point */
 #define _UTRIE_GET_FROM_BMP(trie, data, c16) \
     _UTRIE_GET_RAW(trie, data, 0xd800<=(c16) && (c16)<=0xdbff ? UTRIE_LEAD_INDEX_DISP : 0, c16);
 /**
  * Internal trie getter from a code point.
  * Could be faster(?) but longer with
  *   if((c32)<=0xd7ff) { (result)=_UTRIE_GET_RAW(trie, data, 0, c32); }
  */
 #define _UTRIE_GET(trie, data, c32, result, resultType) \
     if((uint32_t)(c32)<=0xffff) { \
         /* BMP code points */ \
         (result)=_UTRIE_GET_FROM_BMP(trie, data, c32); \
     } else if((uint32_t)(c32)<=0x10ffff) { \
         /* supplementary code point */ \
         UChar __lead16=U16_LEAD(c32); \
         _UTRIE_GET_FROM_PAIR(trie, data, __lead16, c32, result, resultType); \
     } else { \
         /* out of range */ \
         (result)=(resultType)((trie)->initialValue); \
     }
 /** Internal next-post-increment: get the next code point (c, c2) and its data */
 #define _UTRIE_NEXT(trie, data, src, limit, c, c2, result, resultType) { \
     (c)=*(src)++; \
     if(!U16_IS_LEAD(c)) { \
         (c2)=0; \
         (result)=_UTRIE_GET_RAW((trie), data, 0, (c)); \
     } else if((src)!=(limit) && U16_IS_TRAIL((c2)=*(src))) { \
         ++(src); \
         _UTRIE_GET_FROM_PAIR((trie), data, (c), (c2), (result), resultType); \
     } else { \
         /* unpaired lead surrogate code point */ \
         (c2)=0; \
         (result)=_UTRIE_GET_RAW((trie), data, UTRIE_LEAD_INDEX_DISP, (c)); \
     } \
 }
 /** Internal previous: get the previous code point (c, c2) and its data */
 #define _UTRIE_PREVIOUS(trie, data, start, src, c, c2, result, resultType) { \
     (c)=*--(src); \
     if(!U16_IS_SURROGATE(c)) { \
         (c2)=0; \
         (result)=_UTRIE_GET_RAW((trie), data, 0, (c)); \
     } else if(!U16_IS_SURROGATE_LEAD(c)) { \
         /* trail surrogate */ \
         if((start)!=(src) && U16_IS_LEAD((c2)=*((src)-1))) { \
             --(src); \
             (result)=(c); (c)=(c2); (c2)=(UChar)(result); /* swap c, c2 */ \
             _UTRIE_GET_FROM_PAIR((trie), data, (c), (c2), (result), resultType); \
         } else { \
             /* unpaired trail surrogate code point */ \
             (c2)=0; \
             (result)=_UTRIE_GET_RAW((trie), data, 0, (c)); \
         } \
     } else { \
         /* unpaired lead surrogate code point */ \
         (c2)=0; \
         (result)=_UTRIE_GET_RAW((trie), data, UTRIE_LEAD_INDEX_DISP, (c)); \
     } \
 }
 /* Public UTrie API ---------------------------------------------------------*/
 /**
  * Get a pointer to the contiguous part of the data array
  * for the Latin-1 range (U+0000..U+00ff).
  * Must be used only if the Latin-1 range is in fact linear
  * (trie->isLatin1Linear).
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @return (const uint16_t *) pointer to values for Latin-1 code points
  */
 #define UTRIE_GET16_LATIN1(trie) ((trie)->index+(trie)->indexLength+UTRIE_DATA_BLOCK_LENGTH)
 /**
  * Get a pointer to the contiguous part of the data array
  * for the Latin-1 range (U+0000..U+00ff).
  * Must be used only if the Latin-1 range is in fact linear
  * (trie->isLatin1Linear).
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @return (const uint32_t *) pointer to values for Latin-1 code points
  */
 #define UTRIE_GET32_LATIN1(trie) ((trie)->data32+UTRIE_DATA_BLOCK_LENGTH)
 /**
  * Get a 16-bit trie value from a BMP code point (UChar, <=U+ffff).
  * c16 may be a lead surrogate, which may have a value including a folding offset.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param c16 (UChar, in) the input BMP code point
  * @return (uint16_t) trie lookup result
  */
 #define UTRIE_GET16_FROM_LEAD(trie, c16) _UTRIE_GET_RAW(trie, index, 0, c16)
 /**
  * Get a 32-bit trie value from a BMP code point (UChar, <=U+ffff).
  * c16 may be a lead surrogate, which may have a value including a folding offset.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param c16 (UChar, in) the input BMP code point
  * @return (uint32_t) trie lookup result
  */
 #define UTRIE_GET32_FROM_LEAD(trie, c16) _UTRIE_GET_RAW(trie, data32, 0, c16)
 /**
  * Get a 16-bit trie value from a BMP code point (UChar, <=U+ffff).
  * Even lead surrogate code points are treated as normal code points,
  * with unfolded values that may differ from _FROM_LEAD() macro results for them.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param c16 (UChar, in) the input BMP code point
  * @return (uint16_t) trie lookup result
  */
 #define UTRIE_GET16_FROM_BMP(trie, c16) _UTRIE_GET_FROM_BMP(trie, index, c16)
 /**
  * Get a 32-bit trie value from a BMP code point (UChar, <=U+ffff).
  * Even lead surrogate code points are treated as normal code points,
  * with unfolded values that may differ from _FROM_LEAD() macro results for them.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param c16 (UChar, in) the input BMP code point
  * @return (uint32_t) trie lookup result
  */
 #define UTRIE_GET32_FROM_BMP(trie, c16) _UTRIE_GET_FROM_BMP(trie, data32, c16)
 /**
  * Get a 16-bit trie value from a code point.
  * Even lead surrogate code points are treated as normal code points,
  * with unfolded values that may differ from _FROM_LEAD() macro results for them.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param c32 (UChar32, in) the input code point
  * @param result (uint16_t, out) uint16_t variable for the trie lookup result
  */
 #define UTRIE_GET16(trie, c32, result) _UTRIE_GET(trie, index, c32, result, uint16_t)
 /**
  * Get a 32-bit trie value from a code point.
  * Even lead surrogate code points are treated as normal code points,
  * with unfolded values that may differ from _FROM_LEAD() macro results for them.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param c32 (UChar32, in) the input code point
  * @param result (uint32_t, out) uint32_t variable for the trie lookup result
  */
 #define UTRIE_GET32(trie, c32, result) _UTRIE_GET(trie, data32, c32, result, uint32_t)
 /**
  * Get the next code point (c, c2), post-increment src,
  * and get a 16-bit value from the trie.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param src (const UChar *, in/out) the source text pointer
  * @param limit (const UChar *, in) the limit pointer for the text, or NULL
  * @param c (UChar, out) variable for the BMP or lead code unit
  * @param c2 (UChar, out) variable for 0 or the trail code unit
  * @param result (uint16_t, out) uint16_t variable for the trie lookup result
  */
 #define UTRIE_NEXT16(trie, src, limit, c, c2, result) _UTRIE_NEXT(trie, index, src, limit, c, c2, result, uint16_t)
 /**
  * Get the next code point (c, c2), post-increment src,
  * and get a 32-bit value from the trie.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param src (const UChar *, in/out) the source text pointer
  * @param limit (const UChar *, in) the limit pointer for the text, or NULL
  * @param c (UChar, out) variable for the BMP or lead code unit
  * @param c2 (UChar, out) variable for 0 or the trail code unit
  * @param result (uint32_t, out) uint32_t variable for the trie lookup result
  */
 #define UTRIE_NEXT32(trie, src, limit, c, c2, result) _UTRIE_NEXT(trie, data32, src, limit, c, c2, result, uint32_t)
 /**
  * Get the previous code point (c, c2), pre-decrement src,
  * and get a 16-bit value from the trie.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param start (const UChar *, in) the start pointer for the text, or NULL
  * @param src (const UChar *, in/out) the source text pointer
  * @param c (UChar, out) variable for the BMP or lead code unit
  * @param c2 (UChar, out) variable for 0 or the trail code unit
  * @param result (uint16_t, out) uint16_t variable for the trie lookup result
  */
 #define UTRIE_PREVIOUS16(trie, start, src, c, c2, result) _UTRIE_PREVIOUS(trie, index, start, src, c, c2, result, uint16_t)
 /**
  * Get the previous code point (c, c2), pre-decrement src,
  * and get a 32-bit value from the trie.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param start (const UChar *, in) the start pointer for the text, or NULL
  * @param src (const UChar *, in/out) the source text pointer
  * @param c (UChar, out) variable for the BMP or lead code unit
  * @param c2 (UChar, out) variable for 0 or the trail code unit
  * @param result (uint32_t, out) uint32_t variable for the trie lookup result
  */
 #define UTRIE_PREVIOUS32(trie, start, src, c, c2, result) _UTRIE_PREVIOUS(trie, data32, start, src, c, c2, result, uint32_t)
 /**
  * Get a 16-bit trie value from a pair of surrogates.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param c (UChar, in) a lead surrogate
  * @param c2 (UChar, in) a trail surrogate
  * @param result (uint16_t, out) uint16_t variable for the trie lookup result
  */
 #define UTRIE_GET16_FROM_PAIR(trie, c, c2, result) _UTRIE_GET_FROM_PAIR(trie, index, c, c2, result, uint16_t)
 /**
  * Get a 32-bit trie value from a pair of surrogates.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param c (UChar, in) a lead surrogate
  * @param c2 (UChar, in) a trail surrogate
  * @param result (uint32_t, out) uint32_t variable for the trie lookup result
  */
 #define UTRIE_GET32_FROM_PAIR(trie, c, c2, result) _UTRIE_GET_FROM_PAIR(trie, data32, c, c2, result, uint32_t)
 /**
  * Get a 16-bit trie value from a folding offset (from the value of a lead surrogate)
  * and a trail surrogate.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param offset (int32_t, in) the folding offset from the value of a lead surrogate
  * @param c2 (UChar, in) a trail surrogate (only the 10 low bits are significant)
  * @return (uint16_t) trie lookup result
  */
 #define UTRIE_GET16_FROM_OFFSET_TRAIL(trie, offset, c2) _UTRIE_GET_RAW(trie, index, offset, (c2)&0x3ff)
 /**
  * Get a 32-bit trie value from a folding offset (from the value of a lead surrogate)
  * and a trail surrogate.
  *
  * @param trie (const UTrie *, in) a pointer to the runtime trie structure
  * @param offset (int32_t, in) the folding offset from the value of a lead surrogate
  * @param c2 (UChar, in) a trail surrogate (only the 10 low bits are significant)
  * @return (uint32_t) trie lookup result
  */
 #define UTRIE_GET32_FROM_OFFSET_TRAIL(trie, offset, c2) _UTRIE_GET_RAW(trie, data32, offset, (c2)&0x3ff)
 /* enumeration callback types */
 /**
  * Callback from utrie_enum(), extracts a uint32_t value from a
  * trie value. This value will be passed on to the UTrieEnumRange function.
  *
  * @param context an opaque pointer, as passed into utrie_enum()
  * @param value a value from the trie
  * @return the value that is to be passed on to the UTrieEnumRange function
  */
 typedef uint32_t U_CALLCONV
 UTrieEnumValue(const void *context, uint32_t value);
 /**
  * Callback from utrie_enum(), is called for each contiguous range
  * of code points with the same value as retrieved from the trie and
  * transformed by the UTrieEnumValue function.
  *
  * The callback function can stop the enumeration by returning FALSE.
  *
  * @param context an opaque pointer, as passed into utrie_enum()
  * @param start the first code point in a contiguous range with value
  * @param limit one past the last code point in a contiguous range with value
  * @param value the value that is set for all code points in [start..limit[
  * @return FALSE to stop the enumeration
  */
 typedef UBool U_CALLCONV
 UTrieEnumRange(const void *context, UChar32 start, UChar32 limit, uint32_t value);
 /**
  * Enumerate efficiently all values in a trie.
  * For each entry in the trie, the value to be delivered is passed through
  * the UTrieEnumValue function.
  * The value is unchanged if that function pointer is NULL.
  *
  * For each contiguous range of code points with a given value,
  * the UTrieEnumRange function is called.
  *
  * @param trie a pointer to the runtime trie structure
  * @param enumValue a pointer to a function that may transform the trie entry value,
  *                  or NULL if the values from the trie are to be used directly
  * @param enumRange a pointer to a function that is called for each contiguous range
  *                  of code points with the same value
  * @param context an opaque pointer that is passed on to the callback functions
  */
 U_CAPI void U_EXPORT2
 utrie_enum(const UTrie *trie,
            UTrieEnumValue *enumValue, UTrieEnumRange *enumRange, const void *context);
 /**
  * Unserialize a trie from 32-bit-aligned memory.
  * Inverse of utrie_serialize().
  * Fills the UTrie runtime trie structure with the settings for the trie data.
  *
  * @param trie a pointer to the runtime trie structure
  * @param data a pointer to 32-bit-aligned memory containing trie data
  * @param length the number of bytes available at data
  * @param pErrorCode an in/out ICU UErrorCode
  * @return the number of bytes at data taken up by the trie data
  */
 U_CAPI int32_t U_EXPORT2
 utrie_unserialize(UTrie *trie, const void *data, int32_t length, UErrorCode *pErrorCode);
 /**
  * "Unserialize" a dummy trie.
  * A dummy trie is an empty runtime trie, used when a real data trie cannot
  * be loaded.
  *
  * The input memory is filled so that the trie always returns the initialValue,
  * or the leadUnitValue for lead surrogate code points.
  * The Latin-1 part is always set up to be linear.
  *
  * @param trie a pointer to the runtime trie structure
  * @param data a pointer to 32-bit-aligned memory to be filled with the dummy trie data
  * @param length the number of bytes available at data (recommended to use UTRIE_DUMMY_SIZE)
  * @param initialValue the initial value that is set for all code points
  * @param leadUnitValue the value for lead surrogate code _units_ that do not
  *                      have associated supplementary data
  * @param pErrorCode an in/out ICU UErrorCode
  *
  * @see UTRIE_DUMMY_SIZE
  * @see utrie_open
  */
 U_CAPI int32_t U_EXPORT2
 utrie_unserializeDummy(UTrie *trie,
                        void *data, int32_t length,
                        uint32_t initialValue, uint32_t leadUnitValue,
                        UBool make16BitTrie,
                        UErrorCode *pErrorCode);
 /**
  * Default implementation for UTrie.getFoldingOffset, set automatically by
  * utrie_unserialize().
  * Simply returns the lead surrogate's value itself - which is the inverse
  * of the default folding function used by utrie_serialize().
  * Exported for static const UTrie structures.
  *
  * @see UTrieGetFoldingOffset
  */
 U_CAPI int32_t U_EXPORT2
 utrie_defaultGetFoldingOffset(uint32_t data);
 /* Building a trie ----------------------------------------------------------*/
 /**
  * Build-time trie structure.
  * Opaque definition, here only to make fillIn parameters possible
  * for utrie_open() and utrie_clone().
  */
 struct UNewTrie {
     /**
      * Index values at build-time are 32 bits wide for easier processing.
      * Bit 31 is set if the data block is used by multiple index values (from utrie_setRange()).
      */
     int32_t index[UTRIE_MAX_INDEX_LENGTH];
     uint32_t *data;
     uint32_t leadUnitValue;
     int32_t indexLength, dataCapacity, dataLength;
     UBool isAllocated, isDataAllocated;
     UBool isLatin1Linear, isCompacted;
     /**
      * Map of adjusted indexes, used in utrie_compact().
      * Maps from original indexes to new ones.
      */
     int32_t map[UTRIE_MAX_BUILD_TIME_DATA_LENGTH>>UTRIE_SHIFT];
 };
 typedef struct UNewTrie UNewTrie;
 /**
  * Build-time trie callback function, used with utrie_serialize().
  * This function calculates a lead surrogate's value including a folding offset
  * from the 1024 supplementary code points [start..start+1024[ .
  * It is U+10000 <= start <= U+10fc00 and (start&0x3ff)==0.
  *
  * The folding offset is provided by the caller.
  * It is offset=UTRIE_BMP_INDEX_LENGTH+n*UTRIE_SURROGATE_BLOCK_COUNT with n=0..1023.
  * Instead of the offset itself, n can be stored in 10 bits -
  * or fewer if it can be assumed that few lead surrogates have associated data.
  *
  * The returned value must be
  * - not zero if and only if there is relevant data
  *   for the corresponding 1024 supplementary code points
  * - such that UTrie.getFoldingOffset(UNewTrieGetFoldedValue(..., offset))==offset
  *
  * @return a folded value, or 0 if there is no relevant data for the lead surrogate.
  */
 typedef uint32_t U_CALLCONV
 UNewTrieGetFoldedValue(UNewTrie *trie, UChar32 start, int32_t offset);
 /**
  * Open a build-time trie structure.
  * The size of the build-time data array is specified to avoid allocating a large
  * array in all cases. The array itself can also be passed in.
  *
  * Although the trie is never fully expanded to a linear array, especially when
  * utrie_setRange32() is used, the data array could be large during build time.
  * The maximum length is
  * UTRIE_MAX_BUILD_TIME_DATA_LENGTH=0x110000+UTRIE_DATA_BLOCK_LENGTH+0x400.
  * (Number of Unicode code points + one all-initial-value block +
  *  possible duplicate entries for 1024 lead surrogates.)
  * (UTRIE_DATA_BLOCK_LENGTH<=0x200 in all cases.)
  *
  * @param fillIn a pointer to a UNewTrie structure to be initialized (will not be released), or
  *               NULL if one is to be allocated
  * @param aliasData a pointer to a data array to be used (will not be released), or
  *                  NULL if one is to be allocated
  * @param maxDataLength the capacity of aliasData (if not NULL) or
  *                      the length of the data array to be allocated
  * @param initialValue the initial value that is set for all code points
  * @param leadUnitValue the value for lead surrogate code _units_ that do not
  *                      have associated supplementary data
  * @param latin1Linear a flag indicating whether the Latin-1 range is to be allocated and
  *                     kept in a linear, contiguous part of the data array
  * @return a pointer to the initialized fillIn or the allocated and initialized new UNewTrie
  */
 U_CAPI UNewTrie * U_EXPORT2
 utrie_open(UNewTrie *fillIn,
            uint32_t *aliasData, int32_t maxDataLength,
            uint32_t initialValue, uint32_t leadUnitValue,
            UBool latin1Linear);
 /**
  * Clone a build-time trie structure with all entries.
  *
  * @param fillIn like in utrie_open()
  * @param other the build-time trie structure to clone
  * @param aliasData like in utrie_open(),
  *                  used if aliasDataLength>=(capacity of other's data array)
  * @param aliasDataLength the length of aliasData
  * @return a pointer to the initialized fillIn or the allocated and initialized new UNewTrie
  */
 U_CAPI UNewTrie * U_EXPORT2
 utrie_clone(UNewTrie *fillIn, const UNewTrie *other, uint32_t *aliasData, int32_t aliasDataLength);
 /**
  * Close a build-time trie structure, and release memory
  * that was allocated by utrie_open() or utrie_clone().
  *
  * @param trie the build-time trie
  */
 U_CAPI void U_EXPORT2
 utrie_close(UNewTrie *trie);
 /**
  * Get the data array of a build-time trie.
  * The data may be modified, but entries that are equal before
  * must still be equal after modification.
  *
  * @param trie the build-time trie
  * @param pLength (out) a pointer to a variable that receives the number
  *                of entries in the data array
  * @return the data array
  */
 U_CAPI uint32_t * U_EXPORT2
 utrie_getData(UNewTrie *trie, int32_t *pLength);
 /**
  * Set a value for a code point.
  *
  * @param trie the build-time trie
  * @param c the code point
  * @param value the value
  * @return FALSE if a failure occurred (illegal argument or data array overrun)
  */
 U_CAPI UBool U_EXPORT2
 utrie_set32(UNewTrie *trie, UChar32 c, uint32_t value);
 /**
  * Get a value from a code point as stored in the build-time trie.
  *
  * @param trie the build-time trie
  * @param c the code point
  * @param pInBlockZero if not NULL, then *pInBlockZero is set to TRUE
  *                     iff the value is retrieved from block 0;
  *                     block 0 is the all-initial-value initial block
  * @return the value
  */
 U_CAPI uint32_t U_EXPORT2
 utrie_get32(UNewTrie *trie, UChar32 c, UBool *pInBlockZero);
 /**
  * Set a value in a range of code points [start..limit[.
  * All code points c with start<=c<limit will get the value if
  * overwrite is TRUE or if the old value is 0.
  *
  * @param trie the build-time trie
  * @param start the first code point to get the value
  * @param limit one past the last code point to get the value
  * @param value the value
  * @param overwrite flag for whether old non-initial values are to be overwritten
  * @return FALSE if a failure occurred (illegal argument or data array overrun)
  */
 U_CAPI UBool U_EXPORT2
 utrie_setRange32(UNewTrie *trie, UChar32 start, UChar32 limit, uint32_t value, UBool overwrite);
 /**
  * Compact the build-time trie after all values are set, and then
  * serialize it into 32-bit aligned memory.
  *
  * After this, the trie can only be serizalized again and/or closed;
  * no further values can be added.
  *
  * @see utrie_unserialize()
  *
  * @param trie the build-time trie
  * @param data a pointer to 32-bit-aligned memory for the trie data
  * @param capacity the number of bytes available at data
  * @param getFoldedValue a callback function that calculates the value for
  *                       a lead surrogate from all of its supplementary code points
  *                       and the folding offset;
  *                       if NULL, then a default function is used which returns just
  *                       the input offset when there are any non-initial-value entries
  * @param reduceTo16Bits flag for whether the values are to be reduced to a
  *                       width of 16 bits for serialization and runtime
  * @param pErrorCode a UErrorCode argument; among other possible error codes:
  * - U_BUFFER_OVERFLOW_ERROR if the data storage block is too small for serialization
  * - U_MEMORY_ALLOCATION_ERROR if the trie data array is too small
  * - U_INDEX_OUTOFBOUNDS_ERROR if the index or data arrays are too long after compaction for serialization
  *
  * @return the number of bytes written for the trie
  */
 U_CAPI int32_t U_EXPORT2
 utrie_serialize(UNewTrie *trie, void *data, int32_t capacity,
                 UNewTrieGetFoldedValue *getFoldedValue,
                 UBool reduceTo16Bits,
                 UErrorCode *pErrorCode);
 /**
  * Swap a serialized UTrie.
  * @internal
  */
 U_CAPI int32_t U_EXPORT2
 utrie_swap(const UDataSwapper *ds,
            const void *inData, int32_t length, void *outData,
            UErrorCode *pErrorCode);
 /* serialization ------------------------------------------------------------ */
 /**
  * Trie data structure in serialized form:
  *
  * UTrieHeader header;
  * uint16_t index[header.indexLength];
  * uint16_t data[header.dataLength];
  * @internal
  */
 typedef struct UTrieHeader {
     /** "Trie" in big-endian US-ASCII (0x54726965) */
     uint32_t signature;
     /**
      * options bit field:
      *     9    1=Latin-1 data is stored linearly at data+UTRIE_DATA_BLOCK_LENGTH
      *     8    0=16-bit data, 1=32-bit data
      *  7..4    UTRIE_INDEX_SHIFT   // 0..UTRIE_SHIFT
      *  3..0    UTRIE_SHIFT         // 1..9
      */
     uint32_t options;
     /** indexLength is a multiple of UTRIE_SURROGATE_BLOCK_COUNT */
     int32_t indexLength;
     /** dataLength>=UTRIE_DATA_BLOCK_LENGTH */
     int32_t dataLength;
 } UTrieHeader;
 /**
  * Constants for use with UTrieHeader.options.
  * @internal
  */
 enum {
     /** Mask to get the UTRIE_SHIFT value from options. */
     UTRIE_OPTIONS_SHIFT_MASK=0xf,
     /** Shift options right this much to get the UTRIE_INDEX_SHIFT value. */
     UTRIE_OPTIONS_INDEX_SHIFT=4,
     /** If set, then the data (stage 2) array is 32 bits wide. */
     UTRIE_OPTIONS_DATA_IS_32_BIT=0x100,
     /**
      * If set, then Latin-1 data (for U+0000..U+00ff) is stored in the data (stage 2) array
      * as a simple, linear array at data+UTRIE_DATA_BLOCK_LENGTH.
      */
     UTRIE_OPTIONS_LATIN1_IS_LINEAR=0x200
 };
 U_CDECL_END
 #endif

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intl/icu/source/common/utrie.h