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50a541b708
Update to ICU 68.2 by running "update-icu.sh" with "maint/maint-68" as the target. Differential Revision: https://phabricator.services.mozilla.com/D101389
793 lines
30 KiB
C
793 lines
30 KiB
C
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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*
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* Copyright (C) 2001-2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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* file name: utrie.h
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2001nov08
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* created by: Markus W. Scherer
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*/
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#ifndef __UTRIE_H__
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#define __UTRIE_H__
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#include "unicode/utypes.h"
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#include "unicode/utf16.h"
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U_CDECL_BEGIN
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/**
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* \file
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*
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* This is a common implementation of a "folded" trie.
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* It is a kind of compressed, serializable table of 16- or 32-bit values associated with
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* Unicode code points (0..0x10ffff).
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*
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* This implementation is optimized for getting values while walking forward
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* through a UTF-16 string.
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* Therefore, the simplest and fastest access macros are the
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* _FROM_LEAD() and _FROM_OFFSET_TRAIL() macros.
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*
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* The _FROM_BMP() macros are a little more complicated; they get values
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* even for lead surrogate code _points_, while the _FROM_LEAD() macros
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* get special "folded" values for lead surrogate code _units_ if
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* there is relevant data associated with them.
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* From such a folded value, an offset needs to be extracted to supply
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* to the _FROM_OFFSET_TRAIL() macros.
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*
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* Most of the more complex (and more convenient) functions/macros call a callback function
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* to get that offset from the folded value for a lead surrogate unit.
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*/
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/**
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* Trie constants, defining shift widths, index array lengths, etc.
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*/
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enum {
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/** Shift size for shifting right the input index. 1..9 */
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UTRIE_SHIFT=5,
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/** Number of data values in a stage 2 (data array) block. 2, 4, 8, .., 0x200 */
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UTRIE_DATA_BLOCK_LENGTH=1<<UTRIE_SHIFT,
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/** Mask for getting the lower bits from the input index. */
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UTRIE_MASK=UTRIE_DATA_BLOCK_LENGTH-1,
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/**
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* Lead surrogate code points' index displacement in the index array.
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* 0x10000-0xd800=0x2800
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*/
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UTRIE_LEAD_INDEX_DISP=0x2800>>UTRIE_SHIFT,
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/**
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* Shift size for shifting left the index array values.
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* Increases possible data size with 16-bit index values at the cost
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* of compactability.
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* This requires blocks of stage 2 data to be aligned by UTRIE_DATA_GRANULARITY.
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* 0..UTRIE_SHIFT
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*/
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UTRIE_INDEX_SHIFT=2,
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/** The alignment size of a stage 2 data block. Also the granularity for compaction. */
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UTRIE_DATA_GRANULARITY=1<<UTRIE_INDEX_SHIFT,
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/** Number of bits of a trail surrogate that are used in index table lookups. */
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UTRIE_SURROGATE_BLOCK_BITS=10-UTRIE_SHIFT,
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/**
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* Number of index (stage 1) entries per lead surrogate.
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* Same as number of index entries for 1024 trail surrogates,
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* ==0x400>>UTRIE_SHIFT
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*/
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UTRIE_SURROGATE_BLOCK_COUNT=(1<<UTRIE_SURROGATE_BLOCK_BITS),
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/** Length of the BMP portion of the index (stage 1) array. */
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UTRIE_BMP_INDEX_LENGTH=0x10000>>UTRIE_SHIFT
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};
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/**
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* Length of the index (stage 1) array before folding.
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* Maximum number of Unicode code points (0x110000) shifted right by UTRIE_SHIFT.
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*/
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#define UTRIE_MAX_INDEX_LENGTH (0x110000>>UTRIE_SHIFT)
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/**
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* Maximum length of the runtime data (stage 2) array.
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* Limited by 16-bit index values that are left-shifted by UTRIE_INDEX_SHIFT.
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*/
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#define UTRIE_MAX_DATA_LENGTH (0x10000<<UTRIE_INDEX_SHIFT)
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/**
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* Maximum length of the build-time data (stage 2) array.
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* The maximum length is 0x110000+UTRIE_DATA_BLOCK_LENGTH+0x400.
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* (Number of Unicode code points + one all-initial-value block +
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* possible duplicate entries for 1024 lead surrogates.)
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*/
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#define UTRIE_MAX_BUILD_TIME_DATA_LENGTH (0x110000+UTRIE_DATA_BLOCK_LENGTH+0x400)
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/**
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* Number of bytes for a dummy trie.
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* A dummy trie is an empty runtime trie, used when a real data trie cannot
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* be loaded.
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* The number of bytes works for Latin-1-linear tries with 32-bit data
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* (worst case).
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*
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* Calculation:
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* BMP index + 1 index block for lead surrogate code points +
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* Latin-1-linear array + 1 data block for lead surrogate code points
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*
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* Latin-1: if(UTRIE_SHIFT<=8) { 256 } else { included in first data block }
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*
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* @see utrie_unserializeDummy
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*/
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#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)
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/**
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* Runtime UTrie callback function.
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* Extract from a lead surrogate's data the
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* index array offset of the indexes for that lead surrogate.
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*
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* @param data data value for a surrogate from the trie, including the folding offset
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* @return offset>=UTRIE_BMP_INDEX_LENGTH, or 0 if there is no data for the lead surrogate
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*/
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typedef int32_t U_CALLCONV
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UTrieGetFoldingOffset(uint32_t data);
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/**
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* Run-time Trie structure.
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*
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* Either the data table is 16 bits wide and accessed via the index
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* pointer, with each index item increased by indexLength;
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* in this case, data32==NULL.
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*
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* Or the data table is 32 bits wide and accessed via the data32 pointer.
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*/
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struct UTrie {
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const uint16_t *index;
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const uint32_t *data32; /* NULL if 16b data is used via index */
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/**
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* This function is not used in _FROM_LEAD, _FROM_BMP, and _FROM_OFFSET_TRAIL macros.
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* If convenience macros like _GET16 or _NEXT32 are used, this function must be set.
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*
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* utrie_unserialize() sets a default function which simply returns
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* the lead surrogate's value itself - which is the inverse of the default
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* folding function used by utrie_serialize().
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*
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* @see UTrieGetFoldingOffset
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*/
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UTrieGetFoldingOffset *getFoldingOffset;
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int32_t indexLength, dataLength;
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uint32_t initialValue;
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UBool isLatin1Linear;
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};
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#ifndef __UTRIE2_H__
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typedef struct UTrie UTrie;
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#endif
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/** Internal trie getter from an offset (0 if c16 is a BMP/lead units) and a 16-bit unit */
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#define _UTRIE_GET_RAW(trie, data, offset, c16) \
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(trie)->data[ \
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((int32_t)((trie)->index[(offset)+((c16)>>UTRIE_SHIFT)])<<UTRIE_INDEX_SHIFT)+ \
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((c16)&UTRIE_MASK) \
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]
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/** Internal trie getter from a pair of surrogates */
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#define _UTRIE_GET_FROM_PAIR(trie, data, c, c2, result, resultType) UPRV_BLOCK_MACRO_BEGIN { \
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int32_t __offset; \
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\
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/* get data for lead surrogate */ \
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(result)=_UTRIE_GET_RAW((trie), data, 0, (c)); \
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__offset=(trie)->getFoldingOffset(result); \
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\
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/* get the real data from the folded lead/trail units */ \
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if(__offset>0) { \
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(result)=_UTRIE_GET_RAW((trie), data, __offset, (c2)&0x3ff); \
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} else { \
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(result)=(resultType)((trie)->initialValue); \
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} \
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} UPRV_BLOCK_MACRO_END
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/** Internal trie getter from a BMP code point, treating a lead surrogate as a normal code point */
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#define _UTRIE_GET_FROM_BMP(trie, data, c16) \
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_UTRIE_GET_RAW(trie, data, 0xd800<=(c16) && (c16)<=0xdbff ? UTRIE_LEAD_INDEX_DISP : 0, c16)
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/**
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* Internal trie getter from a code point.
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* Could be faster(?) but longer with
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* if((c32)<=0xd7ff) { (result)=_UTRIE_GET_RAW(trie, data, 0, c32); }
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*/
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#define _UTRIE_GET(trie, data, c32, result, resultType) UPRV_BLOCK_MACRO_BEGIN { \
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if((uint32_t)(c32)<=0xffff) { \
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/* BMP code points */ \
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(result)=_UTRIE_GET_FROM_BMP(trie, data, c32); \
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} else if((uint32_t)(c32)<=0x10ffff) { \
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/* supplementary code point */ \
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UChar __lead16=U16_LEAD(c32); \
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_UTRIE_GET_FROM_PAIR(trie, data, __lead16, c32, result, resultType); \
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} else { \
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/* out of range */ \
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(result)=(resultType)((trie)->initialValue); \
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} \
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} UPRV_BLOCK_MACRO_END
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/** Internal next-post-increment: get the next code point (c, c2) and its data */
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#define _UTRIE_NEXT(trie, data, src, limit, c, c2, result, resultType) UPRV_BLOCK_MACRO_BEGIN { \
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(c)=*(src)++; \
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if(!U16_IS_LEAD(c)) { \
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(c2)=0; \
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(result)=_UTRIE_GET_RAW((trie), data, 0, (c)); \
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} else if((src)!=(limit) && U16_IS_TRAIL((c2)=*(src))) { \
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++(src); \
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_UTRIE_GET_FROM_PAIR((trie), data, (c), (c2), (result), resultType); \
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} else { \
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/* unpaired lead surrogate code point */ \
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(c2)=0; \
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(result)=_UTRIE_GET_RAW((trie), data, UTRIE_LEAD_INDEX_DISP, (c)); \
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} \
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} UPRV_BLOCK_MACRO_END
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/** Internal previous: get the previous code point (c, c2) and its data */
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#define _UTRIE_PREVIOUS(trie, data, start, src, c, c2, result, resultType) UPRV_BLOCK_MACRO_BEGIN { \
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(c)=*--(src); \
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if(!U16_IS_SURROGATE(c)) { \
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(c2)=0; \
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(result)=_UTRIE_GET_RAW((trie), data, 0, (c)); \
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} else if(!U16_IS_SURROGATE_LEAD(c)) { \
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/* trail surrogate */ \
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if((start)!=(src) && U16_IS_LEAD((c2)=*((src)-1))) { \
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--(src); \
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(result)=(c); (c)=(c2); (c2)=(UChar)(result); /* swap c, c2 */ \
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_UTRIE_GET_FROM_PAIR((trie), data, (c), (c2), (result), resultType); \
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} else { \
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/* unpaired trail surrogate code point */ \
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(c2)=0; \
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(result)=_UTRIE_GET_RAW((trie), data, 0, (c)); \
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} \
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} else { \
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/* unpaired lead surrogate code point */ \
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(c2)=0; \
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(result)=_UTRIE_GET_RAW((trie), data, UTRIE_LEAD_INDEX_DISP, (c)); \
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} \
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} UPRV_BLOCK_MACRO_END
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/* Public UTrie API ---------------------------------------------------------*/
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/**
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* Get a pointer to the contiguous part of the data array
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* for the Latin-1 range (U+0000..U+00ff).
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* Must be used only if the Latin-1 range is in fact linear
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* (trie->isLatin1Linear).
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @return (const uint16_t *) pointer to values for Latin-1 code points
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*/
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#define UTRIE_GET16_LATIN1(trie) ((trie)->index+(trie)->indexLength+UTRIE_DATA_BLOCK_LENGTH)
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/**
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* Get a pointer to the contiguous part of the data array
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* for the Latin-1 range (U+0000..U+00ff).
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* Must be used only if the Latin-1 range is in fact linear
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* (trie->isLatin1Linear).
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @return (const uint32_t *) pointer to values for Latin-1 code points
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*/
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#define UTRIE_GET32_LATIN1(trie) ((trie)->data32+UTRIE_DATA_BLOCK_LENGTH)
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/**
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* Get a 16-bit trie value from a BMP code point (UChar, <=U+ffff).
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* c16 may be a lead surrogate, which may have a value including a folding offset.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param c16 (UChar, in) the input BMP code point
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* @return (uint16_t) trie lookup result
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*/
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#define UTRIE_GET16_FROM_LEAD(trie, c16) _UTRIE_GET_RAW(trie, index, 0, c16)
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/**
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* Get a 32-bit trie value from a BMP code point (UChar, <=U+ffff).
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* c16 may be a lead surrogate, which may have a value including a folding offset.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param c16 (UChar, in) the input BMP code point
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* @return (uint32_t) trie lookup result
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*/
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#define UTRIE_GET32_FROM_LEAD(trie, c16) _UTRIE_GET_RAW(trie, data32, 0, c16)
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/**
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* Get a 16-bit trie value from a BMP code point (UChar, <=U+ffff).
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* Even lead surrogate code points are treated as normal code points,
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* with unfolded values that may differ from _FROM_LEAD() macro results for them.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param c16 (UChar, in) the input BMP code point
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* @return (uint16_t) trie lookup result
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*/
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#define UTRIE_GET16_FROM_BMP(trie, c16) _UTRIE_GET_FROM_BMP(trie, index, c16)
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/**
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* Get a 32-bit trie value from a BMP code point (UChar, <=U+ffff).
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* Even lead surrogate code points are treated as normal code points,
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* with unfolded values that may differ from _FROM_LEAD() macro results for them.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param c16 (UChar, in) the input BMP code point
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* @return (uint32_t) trie lookup result
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*/
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#define UTRIE_GET32_FROM_BMP(trie, c16) _UTRIE_GET_FROM_BMP(trie, data32, c16)
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/**
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* Get a 16-bit trie value from a code point.
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* Even lead surrogate code points are treated as normal code points,
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* with unfolded values that may differ from _FROM_LEAD() macro results for them.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param c32 (UChar32, in) the input code point
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* @param result (uint16_t, out) uint16_t variable for the trie lookup result
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*/
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#define UTRIE_GET16(trie, c32, result) _UTRIE_GET(trie, index, c32, result, uint16_t)
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/**
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* Get a 32-bit trie value from a code point.
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* Even lead surrogate code points are treated as normal code points,
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* with unfolded values that may differ from _FROM_LEAD() macro results for them.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param c32 (UChar32, in) the input code point
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* @param result (uint32_t, out) uint32_t variable for the trie lookup result
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*/
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#define UTRIE_GET32(trie, c32, result) _UTRIE_GET(trie, data32, c32, result, uint32_t)
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/**
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* Get the next code point (c, c2), post-increment src,
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* and get a 16-bit value from the trie.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param src (const UChar *, in/out) the source text pointer
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* @param limit (const UChar *, in) the limit pointer for the text, or NULL
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* @param c (UChar, out) variable for the BMP or lead code unit
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* @param c2 (UChar, out) variable for 0 or the trail code unit
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* @param result (uint16_t, out) uint16_t variable for the trie lookup result
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*/
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#define UTRIE_NEXT16(trie, src, limit, c, c2, result) _UTRIE_NEXT(trie, index, src, limit, c, c2, result, uint16_t)
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/**
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* Get the next code point (c, c2), post-increment src,
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* and get a 32-bit value from the trie.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param src (const UChar *, in/out) the source text pointer
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* @param limit (const UChar *, in) the limit pointer for the text, or NULL
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* @param c (UChar, out) variable for the BMP or lead code unit
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* @param c2 (UChar, out) variable for 0 or the trail code unit
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* @param result (uint32_t, out) uint32_t variable for the trie lookup result
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*/
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#define UTRIE_NEXT32(trie, src, limit, c, c2, result) _UTRIE_NEXT(trie, data32, src, limit, c, c2, result, uint32_t)
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/**
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* Get the previous code point (c, c2), pre-decrement src,
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* and get a 16-bit value from the trie.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param start (const UChar *, in) the start pointer for the text, or NULL
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* @param src (const UChar *, in/out) the source text pointer
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* @param c (UChar, out) variable for the BMP or lead code unit
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* @param c2 (UChar, out) variable for 0 or the trail code unit
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* @param result (uint16_t, out) uint16_t variable for the trie lookup result
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*/
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#define UTRIE_PREVIOUS16(trie, start, src, c, c2, result) _UTRIE_PREVIOUS(trie, index, start, src, c, c2, result, uint16_t)
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/**
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* Get the previous code point (c, c2), pre-decrement src,
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* and get a 32-bit value from the trie.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param start (const UChar *, in) the start pointer for the text, or NULL
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* @param src (const UChar *, in/out) the source text pointer
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* @param c (UChar, out) variable for the BMP or lead code unit
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* @param c2 (UChar, out) variable for 0 or the trail code unit
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* @param result (uint32_t, out) uint32_t variable for the trie lookup result
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*/
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#define UTRIE_PREVIOUS32(trie, start, src, c, c2, result) _UTRIE_PREVIOUS(trie, data32, start, src, c, c2, result, uint32_t)
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/**
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* Get a 16-bit trie value from a pair of surrogates.
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*
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* @param trie (const UTrie *, in) a pointer to the runtime trie structure
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* @param c (UChar, in) a lead surrogate
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* @param c2 (UChar, in) a trail surrogate
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* @param result (uint16_t, out) uint16_t variable for the trie lookup result
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*/
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#define UTRIE_GET16_FROM_PAIR(trie, c, c2, result) _UTRIE_GET_FROM_PAIR(trie, index, c, c2, result, uint16_t)
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/**
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* Get a 32-bit trie value from a pair of surrogates.
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*
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* @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+UTRIE_SURROGATE_BLOCK_COUNT];
|
|
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);
|
|
|
|
/* serialization ------------------------------------------------------------ */
|
|
|
|
// UTrie signature values, in platform endianness and opposite endianness.
|
|
// The UTrie signature ASCII byte values spell "Trie".
|
|
#define UTRIE_SIG 0x54726965
|
|
#define UTRIE_OE_SIG 0x65697254
|
|
|
|
/**
|
|
* 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
|