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diff --git a/thirdparty/icu4c/common/utrie.h b/thirdparty/icu4c/common/utrie.h new file mode 100644 index 0000000000..2fd2c461ff --- /dev/null +++ b/thirdparty/icu4c/common/utrie.h @@ -0,0 +1,793 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +****************************************************************************** +* +* Copyright (C) 2001-2011, International Business Machines +* Corporation and others. All Rights Reserved. +* +****************************************************************************** +* file name: utrie.h +* encoding: UTF-8 +* 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" + +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) UPRV_BLOCK_MACRO_BEGIN { \ + 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); \ + } \ +} UPRV_BLOCK_MACRO_END + +/** 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) UPRV_BLOCK_MACRO_BEGIN { \ + 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); \ + } \ +} UPRV_BLOCK_MACRO_END + +/** 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) UPRV_BLOCK_MACRO_BEGIN { \ + (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)); \ + } \ +} UPRV_BLOCK_MACRO_END + +/** Internal previous: get the previous code point (c, c2) and its data */ +#define _UTRIE_PREVIOUS(trie, data, start, src, c, c2, result, resultType) UPRV_BLOCK_MACRO_BEGIN { \ + (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)); \ + } \ +} UPRV_BLOCK_MACRO_END + +/* 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+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 |