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Edit File : ucptrie.h \| Size : 22.29 KB
// © 2017 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html // ucptrie.h (modified from utrie2.h) // created: 2017dec29 Markus W. Scherer #ifndef __UCPTRIE_H__ #define __UCPTRIE_H__ #include "unicode/utypes.h" #ifndef U_HIDE_DRAFT_API #include "unicode/localpointer.h" #include "unicode/ucpmap.h" #include "unicode/utf8.h" U_CDECL_BEGIN /** * \file * * This file defines an immutable Unicode code point trie. * * @see UCPTrie * @see UMutableCPTrie / #ifndef U_IN_DOXYGEN /* @internal / typedef union UCPTrieData { /* @internal / const void ptr0; /** @internal / const uint16_t ptr16; /** @internal / const uint32_t ptr32; /** @internal / const uint8_t ptr8; } UCPTrieData; #endif /** * Immutable Unicode code point trie structure. * Fast, reasonably compact, map from Unicode code points (U+0000..U+10FFFF) to integer values. * For details see http://site.icu-project.org/design/struct/utrie * * Do not access UCPTrie fields directly; use public functions and macros. * Functions are easy to use: They support all trie types and value widths. * * When performance is really important, macros provide faster access. * Most macros are specific to either "fast" or "small" tries, see UCPTrieType. * There are "fast" macros for special optimized use cases. * * The macros will return bogus values, or may crash, if used on the wrong type or value width. * * @see UMutableCPTrie * @draft ICU 63 / struct UCPTrie { #ifndef U_IN_DOXYGEN /* @internal / const uint16_t index; /** @internal / UCPTrieData data; /* @internal / int32_t indexLength; /* @internal / int32_t dataLength; /* Start of the last range which ends at U+10FFFF. @internal / UChar32 highStart; /* highStart>>12 @internal / uint16_t shifted12HighStart; /* @internal / int8_t type; // UCPTrieType /* @internal / int8_t valueWidth; // UCPTrieValueWidth /* padding/reserved @internal / uint32_t reserved32; /* padding/reserved @internal / uint16_t reserved16; /* * Internal index-3 null block offset. * Set to an impossibly high value (e.g., 0xffff) if there is no dedicated index-3 null block. * @internal / uint16_t index3NullOffset; /* * Internal data null block offset, not shifted. * Set to an impossibly high value (e.g., 0xfffff) if there is no dedicated data null block. * @internal / int32_t dataNullOffset; /* @internal / uint32_t nullValue; #ifdef UCPTRIE_DEBUG /* @internal / const char name; #endif #endif }; #ifndef U_IN_DOXYGEN typedef struct UCPTrie UCPTrie; #endif /** * Selectors for the type of a UCPTrie. * Different trade-offs for size vs. speed. * * @see umutablecptrie_buildImmutable * @see ucptrie_openFromBinary * @see ucptrie_getType * @draft ICU 63 / enum UCPTrieType { /* * For ucptrie_openFromBinary() to accept any type. * ucptrie_getType() will return the actual type. * @draft ICU 63 / UCPTRIE_TYPE_ANY = -1, /* * Fast/simple/larger BMP data structure. Use functions and "fast" macros. * @draft ICU 63 / UCPTRIE_TYPE_FAST, /* * Small/slower BMP data structure. Use functions and "small" macros. * @draft ICU 63 / UCPTRIE_TYPE_SMALL }; #ifndef U_IN_DOXYGEN typedef enum UCPTrieType UCPTrieType; #endif /* * Selectors for the number of bits in a UCPTrie data value. * * @see umutablecptrie_buildImmutable * @see ucptrie_openFromBinary * @see ucptrie_getValueWidth * @draft ICU 63 / enum UCPTrieValueWidth { /* * For ucptrie_openFromBinary() to accept any data value width. * ucptrie_getValueWidth() will return the actual data value width. * @draft ICU 63 / UCPTRIE_VALUE_BITS_ANY = -1, /* * The trie stores 16 bits per data value. * It returns them as unsigned values 0..0xffff=65535. * @draft ICU 63 / UCPTRIE_VALUE_BITS_16, /* * The trie stores 32 bits per data value. * @draft ICU 63 / UCPTRIE_VALUE_BITS_32, /* * The trie stores 8 bits per data value. * It returns them as unsigned values 0..0xff=255. * @draft ICU 63 / UCPTRIE_VALUE_BITS_8 }; #ifndef U_IN_DOXYGEN typedef enum UCPTrieValueWidth UCPTrieValueWidth; #endif /* * Opens a trie from its binary form, stored in 32-bit-aligned memory. * Inverse of ucptrie_toBinary(). * * The memory must remain valid and unchanged as long as the trie is used. * You must ucptrie_close() the trie once you are done using it. * * @param type selects the trie type; results in an * U_INVALID_FORMAT_ERROR if it does not match the binary data; * use UCPTRIE_TYPE_ANY to accept any type * @param valueWidth selects the number of bits in a data value; results in an * U_INVALID_FORMAT_ERROR if it does not match the binary data; * use UCPTRIE_VALUE_BITS_ANY to accept any data value width * @param data a pointer to 32-bit-aligned memory containing the binary data of a UCPTrie * @param length the number of bytes available at data; * can be more than necessary * @param pActualLength receives the actual number of bytes at data taken up by the trie data; * can be NULL * @param pErrorCode an in/out ICU UErrorCode * @return the trie * * @see umutablecptrie_open * @see umutablecptrie_buildImmutable * @see ucptrie_toBinary * @draft ICU 63 / U_CAPI UCPTrie U_EXPORT2 ucptrie_openFromBinary(UCPTrieType type, UCPTrieValueWidth valueWidth, const void data, int32_t length, int32_t pActualLength, UErrorCode pErrorCode); /* * Closes a trie and releases associated memory. * * @param trie the trie * @draft ICU 63 / U_CAPI void U_EXPORT2 ucptrie_close(UCPTrie trie); #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalUCPTriePointer * "Smart pointer" class, closes a UCPTrie via ucptrie_close(). * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @draft ICU 63 / U_DEFINE_LOCAL_OPEN_POINTER(LocalUCPTriePointer, UCPTrie, ucptrie_close); U_NAMESPACE_END #endif /* * Returns the trie type. * * @param trie the trie * @return the trie type * @see ucptrie_openFromBinary * @see UCPTRIE_TYPE_ANY * @draft ICU 63 / U_CAPI UCPTrieType U_EXPORT2 ucptrie_getType(const UCPTrie trie); /** * Returns the number of bits in a trie data value. * * @param trie the trie * @return the number of bits in a trie data value * @see ucptrie_openFromBinary * @see UCPTRIE_VALUE_BITS_ANY * @draft ICU 63 / U_CAPI UCPTrieValueWidth U_EXPORT2 ucptrie_getValueWidth(const UCPTrie trie); /** * Returns the value for a code point as stored in the trie, with range checking. * Returns the trie error value if c is not in the range 0..U+10FFFF. * * Easier to use than UCPTRIE_FAST_GET() and similar macros but slower. * Easier to use because, unlike the macros, this function works on all UCPTrie * objects, for all types and value widths. * * @param trie the trie * @param c the code point * @return the trie value, * or the trie error value if the code point is not in the range 0..U+10FFFF * @draft ICU 63 / U_CAPI uint32_t U_EXPORT2 ucptrie_get(const UCPTrie trie, UChar32 c); /** * Returns the last code point such that all those from start to there have the same value. * Can be used to efficiently iterate over all same-value ranges in a trie. * (This is normally faster than iterating over code points and get()ting each value, * but much slower than a data structure that stores ranges directly.) * * If the UCPMapValueFilter function pointer is not NULL, then * the value to be delivered is passed through that function, and the return value is the end * of the range where all values are modified to the same actual value. * The value is unchanged if that function pointer is NULL. * * Example: * \code * UChar32 start = 0, end; * uint32_t value; * while ((end = ucptrie_getRange(trie, start, UCPMAP_RANGE_NORMAL, 0, * NULL, NULL, &value)) >= 0) { * // Work with the range start..end and its value. * start = end + 1; * } * \endcode * * @param trie the trie * @param start range start * @param option defines whether surrogates are treated normally, * or as having the surrogateValue; usually UCPMAP_RANGE_NORMAL * @param surrogateValue value for surrogates; ignored if option==UCPMAP_RANGE_NORMAL * @param filter a pointer to a function that may modify the trie data value, * or NULL if the values from the trie are to be used unmodified * @param context an opaque pointer that is passed on to the filter function * @param pValue if not NULL, receives the value that every code point start..end has; * may have been modified by filter(context, trie value) * if that function pointer is not NULL * @return the range end code point, or -1 if start is not a valid code point * @draft ICU 63 / U_CAPI UChar32 U_EXPORT2 ucptrie_getRange(const UCPTrie trie, UChar32 start, UCPMapRangeOption option, uint32_t surrogateValue, UCPMapValueFilter filter, const void context, uint32_t pValue); /* * Writes a memory-mappable form of the trie into 32-bit aligned memory. * Inverse of ucptrie_openFromBinary(). * * @param trie the trie * @param data a pointer to 32-bit-aligned memory to be filled with the trie data; * can be NULL if capacity==0 * @param capacity the number of bytes available at data, or 0 for pure preflighting * @param pErrorCode an in/out ICU UErrorCode; * U_BUFFER_OVERFLOW_ERROR if the capacity is too small * @return the number of bytes written or (if buffer overflow) needed for the trie * * @see ucptrie_openFromBinary() * @draft ICU 63 / U_CAPI int32_t U_EXPORT2 ucptrie_toBinary(const UCPTrie trie, void data, int32_t capacity, UErrorCode pErrorCode); /** * Macro parameter value for a trie with 16-bit data values. * Use the name of this macro as a "dataAccess" parameter in other macros. * Do not use this macro in any other way. * * @see UCPTRIE_VALUE_BITS_16 * @draft ICU 63 / #define UCPTRIE_16(trie, i) ((trie)->data.ptr16[i]) /* * Macro parameter value for a trie with 32-bit data values. * Use the name of this macro as a "dataAccess" parameter in other macros. * Do not use this macro in any other way. * * @see UCPTRIE_VALUE_BITS_32 * @draft ICU 63 / #define UCPTRIE_32(trie, i) ((trie)->data.ptr32[i]) /* * Macro parameter value for a trie with 8-bit data values. * Use the name of this macro as a "dataAccess" parameter in other macros. * Do not use this macro in any other way. * * @see UCPTRIE_VALUE_BITS_8 * @draft ICU 63 / #define UCPTRIE_8(trie, i) ((trie)->data.ptr8[i]) /* * Returns a trie value for a code point, with range checking. * Returns the trie error value if c is not in the range 0..U+10FFFF. * * @param trie (const UCPTrie , in) the trie; must have type UCPTRIE_TYPE_FAST @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param c (UChar32, in) the input code point * @return The code point's trie value. * @draft ICU 63 / #define UCPTRIE_FAST_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_CP_INDEX(trie, 0xffff, c)) /* * Returns a 16-bit trie value for a code point, with range checking. * Returns the trie error value if c is not in the range U+0000..U+10FFFF. * * @param trie (const UCPTrie , in) the trie; must have type UCPTRIE_TYPE_SMALL @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param c (UChar32, in) the input code point * @return The code point's trie value. * @draft ICU 63 / #define UCPTRIE_SMALL_GET(trie, dataAccess, c) \ dataAccess(trie, _UCPTRIE_CP_INDEX(trie, UCPTRIE_SMALL_MAX, c)) /* * UTF-16: Reads the next code point (UChar32 c, out), post-increments src, * and gets a value from the trie. * Sets the trie error value if c is an unpaired surrogate. * * @param trie (const UCPTrie , in) the trie; must have type UCPTRIE_TYPE_FAST @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param src (const UChar , in/out) the source text pointer @param limit (const UChar , in) the limit pointer for the text, or NULL if NUL-terminated @param c (UChar32, out) variable for the code point * @param result (out) variable for the trie lookup result * @draft ICU 63 / #define UCPTRIE_FAST_U16_NEXT(trie, dataAccess, src, limit, c, result) { \ (c) = (src)++; \ int32_t __index; \ if (!U16_IS_SURROGATE(c)) { \ __index = _UCPTRIE_FAST_INDEX(trie, c); \ } else { \ uint16_t __c2; \ if (U16_IS_SURROGATE_LEAD(c) && (src) != (limit) && U16_IS_TRAIL(__c2 = (src))) { \ ++(src); \ (c) = U16_GET_SUPPLEMENTARY((c), __c2); \ __index = _UCPTRIE_SMALL_INDEX(trie, c); \ } else { \ __index = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET; \ } \ } \ (result) = dataAccess(trie, __index); \ } /* * UTF-16: Reads the previous code point (UChar32 c, out), pre-decrements src, * and gets a value from the trie. * Sets the trie error value if c is an unpaired surrogate. * * @param trie (const UCPTrie , in) the trie; must have type UCPTRIE_TYPE_FAST @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param start (const UChar , in) the start pointer for the text @param src (const UChar , in/out) the source text pointer @param c (UChar32, out) variable for the code point * @param result (out) variable for the trie lookup result * @draft ICU 63 / #define UCPTRIE_FAST_U16_PREV(trie, dataAccess, start, src, c, result) { \ (c) = --(src); \ int32_t __index; \ if (!U16_IS_SURROGATE(c)) { \ __index = _UCPTRIE_FAST_INDEX(trie, c); \ } else { \ uint16_t __c2; \ if (U16_IS_SURROGATE_TRAIL(c) && (src) != (start) && U16_IS_LEAD(__c2 = ((src) - 1))) { \ --(src); \ (c) = U16_GET_SUPPLEMENTARY(__c2, (c)); \ __index = _UCPTRIE_SMALL_INDEX(trie, c); \ } else { \ __index = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET; \ } \ } \ (result) = dataAccess(trie, __index); \ } /* * UTF-8: Post-increments src and gets a value from the trie. * Sets the trie error value for an ill-formed byte sequence. * * Unlike UCPTRIE_FAST_U16_NEXT() this UTF-8 macro does not provide the code point * because it would be more work to do so and is often not needed. * If the trie value differs from the error value, then the byte sequence is well-formed, * and the code point can be assembled without revalidation. * * @param trie (const UCPTrie , in) the trie; must have type UCPTRIE_TYPE_FAST @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param src (const char , in/out) the source text pointer @param limit (const char , in) the limit pointer for the text (must not be NULL) @param result (out) variable for the trie lookup result * @draft ICU 63 / #define UCPTRIE_FAST_U8_NEXT(trie, dataAccess, src, limit, result) { \ int32_t __lead = (uint8_t)(src)++; \ if (!U8_IS_SINGLE(__lead)) { \ uint8_t __t1, __t2, __t3; \ if ((src) != (limit) && \ (__lead >= 0xe0 ? \ __lead < 0xf0 ? /* U+0800..U+FFFF except surrogates / \ U8_LEAD3_T1_BITS[__lead &= 0xf] & (1 << ((__t1 = (src)) >> 5)) && \ ++(src) != (limit) && (__t2 = (src) - 0x80) <= 0x3f && \ (__lead = ((int32_t)(trie)->index[(__lead << 6) + (__t1 & 0x3f)]) + __t2, 1) \ : / U+10000..U+10FFFF / \ (__lead -= 0xf0) <= 4 && \ U8_LEAD4_T1_BITS[(__t1 = (src)) >> 4] & (1 << __lead) && \ (__lead = (__lead << 6) \| (__t1 & 0x3f), ++(src) != (limit)) && \ (__t2 = (src) - 0x80) <= 0x3f && \ ++(src) != (limit) && (__t3 = (src) - 0x80) <= 0x3f && \ (__lead = __lead >= (trie)->shifted12HighStart ? \ (trie)->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET : \ ucptrie_internalSmallU8Index((trie), __lead, __t2, __t3), 1) \ : /* U+0080..U+07FF / \ __lead >= 0xc2 && (__t1 = (src) - 0x80) <= 0x3f && \ (__lead = (int32_t)(trie)->index[__lead & 0x1f] + __t1, 1))) { \ ++(src); \ } else { \ __lead = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET; /* ill-formed/ \ } \ } \ (result) = dataAccess(trie, __lead); \ } /* * UTF-8: Pre-decrements src and gets a value from the trie. * Sets the trie error value for an ill-formed byte sequence. * * Unlike UCPTRIE_FAST_U16_PREV() this UTF-8 macro does not provide the code point * because it would be more work to do so and is often not needed. * If the trie value differs from the error value, then the byte sequence is well-formed, * and the code point can be assembled without revalidation. * * @param trie (const UCPTrie , in) the trie; must have type UCPTRIE_TYPE_FAST @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param start (const char , in) the start pointer for the text @param src (const char , in/out) the source text pointer @param result (out) variable for the trie lookup result * @draft ICU 63 / #define UCPTRIE_FAST_U8_PREV(trie, dataAccess, start, src, result) { \ int32_t __index = (uint8_t)--(src); \ if (!U8_IS_SINGLE(__index)) { \ __index = ucptrie_internalU8PrevIndex((trie), __index, (const uint8_t )(start), \ (const uint8_t )(src)); \ (src) -= __index & 7; \ __index >>= 3; \ } \ (result) = dataAccess(trie, __index); \ } /** * Returns a trie value for an ASCII code point, without range checking. * * @param trie (const UCPTrie , in) the trie (of either fast or small type) @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param c (UChar32, in) the input code point; must be U+0000..U+007F * @return The ASCII code point's trie value. * @draft ICU 63 / #define UCPTRIE_ASCII_GET(trie, dataAccess, c) dataAccess(trie, c) /* * Returns a trie value for a BMP code point (U+0000..U+FFFF), without range checking. * Can be used to look up a value for a UTF-16 code unit if other parts of * the string processing check for surrogates. * * @param trie (const UCPTrie , in) the trie; must have type UCPTRIE_TYPE_FAST @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param c (UChar32, in) the input code point, must be U+0000..U+FFFF * @return The BMP code point's trie value. * @draft ICU 63 / #define UCPTRIE_FAST_BMP_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_FAST_INDEX(trie, c)) /* * Returns a trie value for a supplementary code point (U+10000..U+10FFFF), * without range checking. * * @param trie (const UCPTrie , in) the trie; must have type UCPTRIE_TYPE_FAST @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width * @param c (UChar32, in) the input code point, must be U+10000..U+10FFFF * @return The supplementary code point's trie value. * @draft ICU 63 / #define UCPTRIE_FAST_SUPP_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_SMALL_INDEX(trie, c)) / Internal definitions ----------------------------------------------------- / #ifndef U_IN_DOXYGEN /* * Internal implementation constants. * These are needed for the API macros, but users should not use these directly. * @internal / enum { /* @internal / UCPTRIE_FAST_SHIFT = 6, /* Number of entries in a data block for code points below the fast limit. 64=0x40 @internal / UCPTRIE_FAST_DATA_BLOCK_LENGTH = 1 << UCPTRIE_FAST_SHIFT, /* Mask for getting the lower bits for the in-fast-data-block offset. @internal / UCPTRIE_FAST_DATA_MASK = UCPTRIE_FAST_DATA_BLOCK_LENGTH - 1, /* @internal / UCPTRIE_SMALL_MAX = 0xfff, /* * Offset from dataLength (to be subtracted) for fetching the * value returned for out-of-range code points and ill-formed UTF-8/16. * @internal / UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET = 1, /* * Offset from dataLength (to be subtracted) for fetching the * value returned for code points highStart..U+10FFFF. * @internal / UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET = 2 }; / Internal functions and macros -------------------------------------------- / // Do not conditionalize with #ifndef U_HIDE_INTERNAL_API, needed for public API /* @internal / U_INTERNAL int32_t U_EXPORT2 ucptrie_internalSmallIndex(const UCPTrie trie, UChar32 c); /** @internal / U_INTERNAL int32_t U_EXPORT2 ucptrie_internalSmallU8Index(const UCPTrie trie, int32_t lt1, uint8_t t2, uint8_t t3); /** * Internal function for part of the UCPTRIE_FAST_U8_PREVxx() macro implementations. * Do not call directly. * @internal / U_INTERNAL int32_t U_EXPORT2 ucptrie_internalU8PrevIndex(const UCPTrie trie, UChar32 c, const uint8_t start, const uint8_t src); /** Internal trie getter for a code point below the fast limit. Returns the data index. @internal / #define _UCPTRIE_FAST_INDEX(trie, c) \ ((int32_t)(trie)->index[(c) >> UCPTRIE_FAST_SHIFT] + ((c) & UCPTRIE_FAST_DATA_MASK)) /* Internal trie getter for a code point at or above the fast limit. Returns the data index. @internal / #define _UCPTRIE_SMALL_INDEX(trie, c) \ ((c) >= (trie)->highStart ? \ (trie)->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET : \ ucptrie_internalSmallIndex(trie, c)) /* * Internal trie getter for a code point, with checking that c is in U+0000..10FFFF. * Returns the data index. * @internal */ #define _UCPTRIE_CP_INDEX(trie, fastMax, c) \ ((uint32_t)(c) <= (uint32_t)(fastMax) ? \ _UCPTRIE_FAST_INDEX(trie, c) : \ (uint32_t)(c) <= 0x10ffff ? \ _UCPTRIE_SMALL_INDEX(trie, c) : \ (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET) U_CDECL_END #endif // U_IN_DOXYGEN #endif // U_HIDE_DRAFT_API #endif Back

Edit File : ucptrie.h | Size : 22.29 KB

// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html

// ucptrie.h (modified from utrie2.h)
// created: 2017dec29 Markus W. Scherer

#ifndef __UCPTRIE_H__
#define __UCPTRIE_H__

#include "unicode/utypes.h"

#ifndef U_HIDE_DRAFT_API

#include "unicode/localpointer.h"
#include "unicode/ucpmap.h"
#include "unicode/utf8.h"

U_CDECL_BEGIN

/**
 * \file
 *
 * This file defines an immutable Unicode code point trie.
 *
 * @see UCPTrie
 * @see UMutableCPTrie
 */

#ifndef U_IN_DOXYGEN
/** @internal */
typedef union UCPTrieData {
    /** @internal */
    const void *ptr0;
    /** @internal */
    const uint16_t *ptr16;
    /** @internal */
    const uint32_t *ptr32;
    /** @internal */
    const uint8_t *ptr8;
} UCPTrieData;
#endif

/**
 * Immutable Unicode code point trie structure.
 * Fast, reasonably compact, map from Unicode code points (U+0000..U+10FFFF) to integer values.
 * For details see http://site.icu-project.org/design/struct/utrie
 *
 * Do not access UCPTrie fields directly; use public functions and macros.
 * Functions are easy to use: They support all trie types and value widths.
 *
 * When performance is really important, macros provide faster access.
 * Most macros are specific to either "fast" or "small" tries, see UCPTrieType.
 * There are "fast" macros for special optimized use cases.
 *
 * The macros will return bogus values, or may crash, if used on the wrong type or value width.
 *
 * @see UMutableCPTrie
 * @draft ICU 63
 */
struct UCPTrie {
#ifndef U_IN_DOXYGEN
    /** @internal */
    const uint16_t *index;
    /** @internal */
    UCPTrieData data;

/** @internal */
    int32_t indexLength;
    /** @internal */
    int32_t dataLength;
    /** Start of the last range which ends at U+10FFFF. @internal */
    UChar32 highStart;
    /** highStart>>12 @internal */
    uint16_t shifted12HighStart;

/** @internal */
    int8_t type;  // UCPTrieType
    /** @internal */
    int8_t valueWidth;  // UCPTrieValueWidth

/** padding/reserved @internal */
    uint32_t reserved32;
    /** padding/reserved @internal */
    uint16_t reserved16;

/**
     * Internal index-3 null block offset.
     * Set to an impossibly high value (e.g., 0xffff) if there is no dedicated index-3 null block.
     * @internal
     */
    uint16_t index3NullOffset;
    /**
     * Internal data null block offset, not shifted.
     * Set to an impossibly high value (e.g., 0xfffff) if there is no dedicated data null block.
     * @internal
     */
    int32_t dataNullOffset;
    /** @internal */
    uint32_t nullValue;

#ifdef UCPTRIE_DEBUG
    /** @internal */
    const char *name;
#endif
#endif
};
#ifndef U_IN_DOXYGEN
typedef struct UCPTrie UCPTrie;
#endif

/**
 * Selectors for the type of a UCPTrie.
 * Different trade-offs for size vs. speed.
 *
 * @see umutablecptrie_buildImmutable
 * @see ucptrie_openFromBinary
 * @see ucptrie_getType
 * @draft ICU 63
 */
enum UCPTrieType {
    /**
     * For ucptrie_openFromBinary() to accept any type.
     * ucptrie_getType() will return the actual type.
     * @draft ICU 63
     */
    UCPTRIE_TYPE_ANY = -1,
    /**
     * Fast/simple/larger BMP data structure. Use functions and "fast" macros.
     * @draft ICU 63
     */
    UCPTRIE_TYPE_FAST,
    /**
     * Small/slower BMP data structure. Use functions and "small" macros.
     * @draft ICU 63
     */
    UCPTRIE_TYPE_SMALL
};
#ifndef U_IN_DOXYGEN
typedef enum UCPTrieType UCPTrieType;
#endif

/**
 * Selectors for the number of bits in a UCPTrie data value.
 *
 * @see umutablecptrie_buildImmutable
 * @see ucptrie_openFromBinary
 * @see ucptrie_getValueWidth
 * @draft ICU 63
 */
enum UCPTrieValueWidth {
    /**
     * For ucptrie_openFromBinary() to accept any data value width.
     * ucptrie_getValueWidth() will return the actual data value width.
     * @draft ICU 63
     */
    UCPTRIE_VALUE_BITS_ANY = -1,
    /**
     * The trie stores 16 bits per data value.
     * It returns them as unsigned values 0..0xffff=65535.
     * @draft ICU 63
     */
    UCPTRIE_VALUE_BITS_16,
    /**
     * The trie stores 32 bits per data value.
     * @draft ICU 63
     */
    UCPTRIE_VALUE_BITS_32,
    /**
     * The trie stores 8 bits per data value.
     * It returns them as unsigned values 0..0xff=255.
     * @draft ICU 63
     */
    UCPTRIE_VALUE_BITS_8
};
#ifndef U_IN_DOXYGEN
typedef enum UCPTrieValueWidth UCPTrieValueWidth;
#endif

/**
 * Opens a trie from its binary form, stored in 32-bit-aligned memory.
 * Inverse of ucptrie_toBinary().
 *
 * The memory must remain valid and unchanged as long as the trie is used.
 * You must ucptrie_close() the trie once you are done using it.
 *
 * @param type selects the trie type; results in an
 *             U_INVALID_FORMAT_ERROR if it does not match the binary data;
 *             use UCPTRIE_TYPE_ANY to accept any type
 * @param valueWidth selects the number of bits in a data value; results in an
 *                  U_INVALID_FORMAT_ERROR if it does not match the binary data;
 *                  use UCPTRIE_VALUE_BITS_ANY to accept any data value width
 * @param data a pointer to 32-bit-aligned memory containing the binary data of a UCPTrie
 * @param length the number of bytes available at data;
 *               can be more than necessary
 * @param pActualLength receives the actual number of bytes at data taken up by the trie data;
 *                      can be NULL
 * @param pErrorCode an in/out ICU UErrorCode
 * @return the trie
 *
 * @see umutablecptrie_open
 * @see umutablecptrie_buildImmutable
 * @see ucptrie_toBinary
 * @draft ICU 63
 */
U_CAPI UCPTrie * U_EXPORT2
ucptrie_openFromBinary(UCPTrieType type, UCPTrieValueWidth valueWidth,
                       const void *data, int32_t length, int32_t *pActualLength,
                       UErrorCode *pErrorCode);

/**
 * Closes a trie and releases associated memory.
 *
 * @param trie the trie
 * @draft ICU 63
 */
U_CAPI void U_EXPORT2
ucptrie_close(UCPTrie *trie);

#if U_SHOW_CPLUSPLUS_API

U_NAMESPACE_BEGIN

/**
 * \class LocalUCPTriePointer
 * "Smart pointer" class, closes a UCPTrie via ucptrie_close().
 * For most methods see the LocalPointerBase base class.
 *
 * @see LocalPointerBase
 * @see LocalPointer
 * @draft ICU 63
 */
U_DEFINE_LOCAL_OPEN_POINTER(LocalUCPTriePointer, UCPTrie, ucptrie_close);

U_NAMESPACE_END

#endif

/**
 * Returns the trie type.
 *
 * @param trie the trie
 * @return the trie type
 * @see ucptrie_openFromBinary
 * @see UCPTRIE_TYPE_ANY
 * @draft ICU 63
 */
U_CAPI UCPTrieType U_EXPORT2
ucptrie_getType(const UCPTrie *trie);

/**
 * Returns the number of bits in a trie data value.
 *
 * @param trie the trie
 * @return the number of bits in a trie data value
 * @see ucptrie_openFromBinary
 * @see UCPTRIE_VALUE_BITS_ANY
 * @draft ICU 63
 */
U_CAPI UCPTrieValueWidth U_EXPORT2
ucptrie_getValueWidth(const UCPTrie *trie);

/**
 * Returns the value for a code point as stored in the trie, with range checking.
 * Returns the trie error value if c is not in the range 0..U+10FFFF.
 *
 * Easier to use than UCPTRIE_FAST_GET() and similar macros but slower.
 * Easier to use because, unlike the macros, this function works on all UCPTrie
 * objects, for all types and value widths.
 *
 * @param trie the trie
 * @param c the code point
 * @return the trie value,
 *         or the trie error value if the code point is not in the range 0..U+10FFFF
 * @draft ICU 63
 */
U_CAPI uint32_t U_EXPORT2
ucptrie_get(const UCPTrie *trie, UChar32 c);

/**
 * Returns the last code point such that all those from start to there have the same value.
 * Can be used to efficiently iterate over all same-value ranges in a trie.
 * (This is normally faster than iterating over code points and get()ting each value,
 * but much slower than a data structure that stores ranges directly.)
 *
 * If the UCPMapValueFilter function pointer is not NULL, then
 * the value to be delivered is passed through that function, and the return value is the end
 * of the range where all values are modified to the same actual value.
 * The value is unchanged if that function pointer is NULL.
 *
 * Example:
 * \code
 * UChar32 start = 0, end;
 * uint32_t value;
 * while ((end = ucptrie_getRange(trie, start, UCPMAP_RANGE_NORMAL, 0,
 *                                NULL, NULL, &value)) >= 0) {
 *     // Work with the range start..end and its value.
 *     start = end + 1;
 * }
 * \endcode
 *
 * @param trie the trie
 * @param start range start
 * @param option defines whether surrogates are treated normally,
 *               or as having the surrogateValue; usually UCPMAP_RANGE_NORMAL
 * @param surrogateValue value for surrogates; ignored if option==UCPMAP_RANGE_NORMAL
 * @param filter a pointer to a function that may modify the trie data value,
 *     or NULL if the values from the trie are to be used unmodified
 * @param context an opaque pointer that is passed on to the filter function
 * @param pValue if not NULL, receives the value that every code point start..end has;
 *     may have been modified by filter(context, trie value)
 *     if that function pointer is not NULL
 * @return the range end code point, or -1 if start is not a valid code point
 * @draft ICU 63
 */
U_CAPI UChar32 U_EXPORT2
ucptrie_getRange(const UCPTrie *trie, UChar32 start,
                 UCPMapRangeOption option, uint32_t surrogateValue,
                 UCPMapValueFilter *filter, const void *context, uint32_t *pValue);

/**
 * Writes a memory-mappable form of the trie into 32-bit aligned memory.
 * Inverse of ucptrie_openFromBinary().
 *
 * @param trie the trie
 * @param data a pointer to 32-bit-aligned memory to be filled with the trie data;
 *             can be NULL if capacity==0
 * @param capacity the number of bytes available at data, or 0 for pure preflighting
 * @param pErrorCode an in/out ICU UErrorCode;
 *                   U_BUFFER_OVERFLOW_ERROR if the capacity is too small
 * @return the number of bytes written or (if buffer overflow) needed for the trie
 *
 * @see ucptrie_openFromBinary()
 * @draft ICU 63
 */
U_CAPI int32_t U_EXPORT2
ucptrie_toBinary(const UCPTrie *trie, void *data, int32_t capacity, UErrorCode *pErrorCode);

/**
 * Macro parameter value for a trie with 16-bit data values.
 * Use the name of this macro as a "dataAccess" parameter in other macros.
 * Do not use this macro in any other way.
 *
 * @see UCPTRIE_VALUE_BITS_16
 * @draft ICU 63
 */
#define UCPTRIE_16(trie, i) ((trie)->data.ptr16[i])

/**
 * Macro parameter value for a trie with 32-bit data values.
 * Use the name of this macro as a "dataAccess" parameter in other macros.
 * Do not use this macro in any other way.
 *
 * @see UCPTRIE_VALUE_BITS_32
 * @draft ICU 63
 */
#define UCPTRIE_32(trie, i) ((trie)->data.ptr32[i])

/**
 * Macro parameter value for a trie with 8-bit data values.
 * Use the name of this macro as a "dataAccess" parameter in other macros.
 * Do not use this macro in any other way.
 *
 * @see UCPTRIE_VALUE_BITS_8
 * @draft ICU 63
 */
#define UCPTRIE_8(trie, i) ((trie)->data.ptr8[i])

/**
 * Returns a trie value for a code point, with range checking.
 * Returns the trie error value if c is not in the range 0..U+10FFFF.
 *
 * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param c (UChar32, in) the input code point
 * @return The code point's trie value.
 * @draft ICU 63
 */
#define UCPTRIE_FAST_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_CP_INDEX(trie, 0xffff, c))

/**
 * Returns a 16-bit trie value for a code point, with range checking.
 * Returns the trie error value if c is not in the range U+0000..U+10FFFF.
 *
 * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_SMALL
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param c (UChar32, in) the input code point
 * @return The code point's trie value.
 * @draft ICU 63
 */
#define UCPTRIE_SMALL_GET(trie, dataAccess, c) \
    dataAccess(trie, _UCPTRIE_CP_INDEX(trie, UCPTRIE_SMALL_MAX, c))

/**
 * UTF-16: Reads the next code point (UChar32 c, out), post-increments src,
 * and gets a value from the trie.
 * Sets the trie error value if c is an unpaired surrogate.
 *
 * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param src (const UChar *, in/out) the source text pointer
 * @param limit (const UChar *, in) the limit pointer for the text, or NULL if NUL-terminated
 * @param c (UChar32, out) variable for the code point
 * @param result (out) variable for the trie lookup result
 * @draft ICU 63
 */
#define UCPTRIE_FAST_U16_NEXT(trie, dataAccess, src, limit, c, result) { \
    (c) = *(src)++; \
    int32_t __index; \
    if (!U16_IS_SURROGATE(c)) { \
        __index = _UCPTRIE_FAST_INDEX(trie, c); \
    } else { \
        uint16_t __c2; \
        if (U16_IS_SURROGATE_LEAD(c) && (src) != (limit) && U16_IS_TRAIL(__c2 = *(src))) { \
            ++(src); \
            (c) = U16_GET_SUPPLEMENTARY((c), __c2); \
            __index = _UCPTRIE_SMALL_INDEX(trie, c); \
        } else { \
            __index = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET; \
        } \
    } \
    (result) = dataAccess(trie, __index); \
}

/**
 * UTF-16: Reads the previous code point (UChar32 c, out), pre-decrements src,
 * and gets a value from the trie.
 * Sets the trie error value if c is an unpaired surrogate.
 *
 * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param start (const UChar *, in) the start pointer for the text
 * @param src (const UChar *, in/out) the source text pointer
 * @param c (UChar32, out) variable for the code point
 * @param result (out) variable for the trie lookup result
 * @draft ICU 63
 */
#define UCPTRIE_FAST_U16_PREV(trie, dataAccess, start, src, c, result) { \
    (c) = *--(src); \
    int32_t __index; \
    if (!U16_IS_SURROGATE(c)) { \
        __index = _UCPTRIE_FAST_INDEX(trie, c); \
    } else { \
        uint16_t __c2; \
        if (U16_IS_SURROGATE_TRAIL(c) && (src) != (start) && U16_IS_LEAD(__c2 = *((src) - 1))) { \
            --(src); \
            (c) = U16_GET_SUPPLEMENTARY(__c2, (c)); \
            __index = _UCPTRIE_SMALL_INDEX(trie, c); \
        } else { \
            __index = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET; \
        } \
    } \
    (result) = dataAccess(trie, __index); \
}

/**
 * UTF-8: Post-increments src and gets a value from the trie.
 * Sets the trie error value for an ill-formed byte sequence.
 *
 * Unlike UCPTRIE_FAST_U16_NEXT() this UTF-8 macro does not provide the code point
 * because it would be more work to do so and is often not needed.
 * If the trie value differs from the error value, then the byte sequence is well-formed,
 * and the code point can be assembled without revalidation.
 *
 * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param src (const char *, in/out) the source text pointer
 * @param limit (const char *, in) the limit pointer for the text (must not be NULL)
 * @param result (out) variable for the trie lookup result
 * @draft ICU 63
 */
#define UCPTRIE_FAST_U8_NEXT(trie, dataAccess, src, limit, result) { \
    int32_t __lead = (uint8_t)*(src)++; \
    if (!U8_IS_SINGLE(__lead)) { \
        uint8_t __t1, __t2, __t3; \
        if ((src) != (limit) && \
            (__lead >= 0xe0 ? \
                __lead < 0xf0 ?  /* U+0800..U+FFFF except surrogates */ \
                    U8_LEAD3_T1_BITS[__lead &= 0xf] & (1 << ((__t1 = *(src)) >> 5)) && \
                    ++(src) != (limit) && (__t2 = *(src) - 0x80) <= 0x3f && \
                    (__lead = ((int32_t)(trie)->index[(__lead << 6) + (__t1 & 0x3f)]) + __t2, 1) \
                :  /* U+10000..U+10FFFF */ \
                    (__lead -= 0xf0) <= 4 && \
                    U8_LEAD4_T1_BITS[(__t1 = *(src)) >> 4] & (1 << __lead) && \
                    (__lead = (__lead << 6) | (__t1 & 0x3f), ++(src) != (limit)) && \
                    (__t2 = *(src) - 0x80) <= 0x3f && \
                    ++(src) != (limit) && (__t3 = *(src) - 0x80) <= 0x3f && \
                    (__lead = __lead >= (trie)->shifted12HighStart ? \
                        (trie)->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET : \
                        ucptrie_internalSmallU8Index((trie), __lead, __t2, __t3), 1) \
            :  /* U+0080..U+07FF */ \
                __lead >= 0xc2 && (__t1 = *(src) - 0x80) <= 0x3f && \
                (__lead = (int32_t)(trie)->index[__lead & 0x1f] + __t1, 1))) { \
            ++(src); \
        } else { \
            __lead = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET;  /* ill-formed*/ \
        } \
    } \
    (result) = dataAccess(trie, __lead); \
}

/**
 * UTF-8: Pre-decrements src and gets a value from the trie.
 * Sets the trie error value for an ill-formed byte sequence.
 *
 * Unlike UCPTRIE_FAST_U16_PREV() this UTF-8 macro does not provide the code point
 * because it would be more work to do so and is often not needed.
 * If the trie value differs from the error value, then the byte sequence is well-formed,
 * and the code point can be assembled without revalidation.
 *
 * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param start (const char *, in) the start pointer for the text
 * @param src (const char *, in/out) the source text pointer
 * @param result (out) variable for the trie lookup result
 * @draft ICU 63
 */
#define UCPTRIE_FAST_U8_PREV(trie, dataAccess, start, src, result) { \
    int32_t __index = (uint8_t)*--(src); \
    if (!U8_IS_SINGLE(__index)) { \
        __index = ucptrie_internalU8PrevIndex((trie), __index, (const uint8_t *)(start), \
                                              (const uint8_t *)(src)); \
        (src) -= __index & 7; \
        __index >>= 3; \
    } \
    (result) = dataAccess(trie, __index); \
}

/**
 * Returns a trie value for an ASCII code point, without range checking.
 *
 * @param trie (const UCPTrie *, in) the trie (of either fast or small type)
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param c (UChar32, in) the input code point; must be U+0000..U+007F
 * @return The ASCII code point's trie value.
 * @draft ICU 63
 */
#define UCPTRIE_ASCII_GET(trie, dataAccess, c) dataAccess(trie, c)

/**
 * Returns a trie value for a BMP code point (U+0000..U+FFFF), without range checking.
 * Can be used to look up a value for a UTF-16 code unit if other parts of
 * the string processing check for surrogates.
 *
 * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param c (UChar32, in) the input code point, must be U+0000..U+FFFF
 * @return The BMP code point's trie value.
 * @draft ICU 63
 */
#define UCPTRIE_FAST_BMP_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_FAST_INDEX(trie, c))

/**
 * Returns a trie value for a supplementary code point (U+10000..U+10FFFF),
 * without range checking.
 *
 * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
 * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
 * @param c (UChar32, in) the input code point, must be U+10000..U+10FFFF
 * @return The supplementary code point's trie value.
 * @draft ICU 63
 */
#define UCPTRIE_FAST_SUPP_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_SMALL_INDEX(trie, c))

/* Internal definitions ----------------------------------------------------- */

#ifndef U_IN_DOXYGEN

/**
 * Internal implementation constants.
 * These are needed for the API macros, but users should not use these directly.
 * @internal
 */
enum {
    /** @internal */
    UCPTRIE_FAST_SHIFT = 6,

/** Number of entries in a data block for code points below the fast limit. 64=0x40 @internal */
    UCPTRIE_FAST_DATA_BLOCK_LENGTH = 1 << UCPTRIE_FAST_SHIFT,

/** Mask for getting the lower bits for the in-fast-data-block offset. @internal */
    UCPTRIE_FAST_DATA_MASK = UCPTRIE_FAST_DATA_BLOCK_LENGTH - 1,

/** @internal */
    UCPTRIE_SMALL_MAX = 0xfff,

/**
     * Offset from dataLength (to be subtracted) for fetching the
     * value returned for out-of-range code points and ill-formed UTF-8/16.
     * @internal
     */
    UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET = 1,
    /**
     * Offset from dataLength (to be subtracted) for fetching the
     * value returned for code points highStart..U+10FFFF.
     * @internal
     */
    UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET = 2
};

/* Internal functions and macros -------------------------------------------- */
// Do not conditionalize with #ifndef U_HIDE_INTERNAL_API, needed for public API

/** @internal */
U_INTERNAL int32_t U_EXPORT2
ucptrie_internalSmallIndex(const UCPTrie *trie, UChar32 c);

/** @internal */
U_INTERNAL int32_t U_EXPORT2
ucptrie_internalSmallU8Index(const UCPTrie *trie, int32_t lt1, uint8_t t2, uint8_t t3);

/**
 * Internal function for part of the UCPTRIE_FAST_U8_PREVxx() macro implementations.
 * Do not call directly.
 * @internal
 */
U_INTERNAL int32_t U_EXPORT2
ucptrie_internalU8PrevIndex(const UCPTrie *trie, UChar32 c,
                            const uint8_t *start, const uint8_t *src);

/** Internal trie getter for a code point below the fast limit. Returns the data index. @internal */
#define _UCPTRIE_FAST_INDEX(trie, c) \
    ((int32_t)(trie)->index[(c) >> UCPTRIE_FAST_SHIFT] + ((c) & UCPTRIE_FAST_DATA_MASK))

/** Internal trie getter for a code point at or above the fast limit. Returns the data index. @internal */
#define _UCPTRIE_SMALL_INDEX(trie, c) \
    ((c) >= (trie)->highStart ? \
        (trie)->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET : \
        ucptrie_internalSmallIndex(trie, c))

/**
 * Internal trie getter for a code point, with checking that c is in U+0000..10FFFF.
 * Returns the data index.
 * @internal
 */
#define _UCPTRIE_CP_INDEX(trie, fastMax, c) \
    ((uint32_t)(c) <= (uint32_t)(fastMax) ? \
        _UCPTRIE_FAST_INDEX(trie, c) : \
        (uint32_t)(c) <= 0x10ffff ? \
            _UCPTRIE_SMALL_INDEX(trie, c) : \
            (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET)

U_CDECL_END

#endif  // U_IN_DOXYGEN
#endif  // U_HIDE_DRAFT_API
#endif

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