/*
******************************************************************************
*
* 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