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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
-*******************************************************************************
-*   Copyright (C) 2001-2014, International Business Machines
-*   Corporation and others.  All Rights Reserved.
-*******************************************************************************
-*   file name:  bocsu.h
-*   encoding:   UTF-8
-*   tab size:   8 (not used)
-*   indentation:4
-*
-*   Author: Markus W. Scherer
-*
-*   Modification history:
-*   05/18/2001  weiv    Made into separate module
-*/
-
-#ifndef BOCSU_H
-#define BOCSU_H
-
-#include "unicode/utypes.h"
-
-#if !UCONFIG_NO_COLLATION
-
-U_NAMESPACE_BEGIN
-
-class ByteSink;
-
-U_NAMESPACE_END
-
-/*
- * "BOCSU"
- * Binary Ordered Compression Scheme for Unicode
- *
- * Specific application:
- *
- * Encode a Unicode string for the identical level of a sort key.
- * Restrictions:
- * - byte stream (unsigned 8-bit bytes)
- * - lexical order of the identical-level run must be
- *   the same as code point order for the string
- * - avoid byte values 0, 1, 2
- *
- * Method: Slope Detection
- * Remember the previous code point (initial 0).
- * For each cp in the string, encode the difference to the previous one.
- *
- * With a compact encoding of differences, this yields good results for
- * small scripts and UTF-like results otherwise.
- *
- * Encoding of differences:
- * - Similar to a UTF, encoding the length of the byte sequence in the lead bytes.
- * - Does not need to be friendly for decoding or random access
- *   (trail byte values may overlap with lead/single byte values).
- * - The signedness must be encoded as the most significant part.
- *
- * We encode differences with few bytes if their absolute values are small.
- * For correct ordering, we must treat the entire value range -10ffff..+10ffff
- * in ascending order, which forbids encoding the sign and the absolute value separately.
- * Instead, we split the lead byte range in the middle and encode non-negative values
- * going up and negative values going down.
- *
- * For very small absolute values, the difference is added to a middle byte value
- * for single-byte encoded differences.
- * For somewhat larger absolute values, the difference is divided by the number
- * of byte values available, the modulo is used for one trail byte, and the remainder
- * is added to a lead byte avoiding the single-byte range.
- * For large absolute values, the difference is similarly encoded in three bytes.
- *
- * This encoding does not use byte values 0, 1, 2, but uses all other byte values
- * for lead/single bytes so that the middle range of single bytes is as large
- * as possible.
- * Note that the lead byte ranges overlap some, but that the sequences as a whole
- * are well ordered. I.e., even if the lead byte is the same for sequences of different
- * lengths, the trail bytes establish correct order.
- * It would be possible to encode slightly larger ranges for each length (>1) by
- * subtracting the lower bound of the range. However, that would also slow down the
- * calculation.
- *
- * For the actual string encoding, an optimization moves the previous code point value
- * to the middle of its Unicode script block to minimize the differences in
- * same-script text runs.
- */
-
-/* Do not use byte values 0, 1, 2 because they are separators in sort keys. */
-#define SLOPE_MIN           3
-#define SLOPE_MAX           0xff
-#define SLOPE_MIDDLE        0x81
-
-#define SLOPE_TAIL_COUNT    (SLOPE_MAX-SLOPE_MIN+1)
-
-#define SLOPE_MAX_BYTES     4
-
-/*
- * Number of lead bytes:
- * 1        middle byte for 0
- * 2*80=160 single bytes for !=0
- * 2*42=84  for double-byte values
- * 2*3=6    for 3-byte values
- * 2*1=2    for 4-byte values
- *
- * The sum must be <=SLOPE_TAIL_COUNT.
- *
- * Why these numbers?
- * - There should be >=128 single-byte values to cover 128-blocks
- *   with small scripts.
- * - There should be >=20902 single/double-byte values to cover Unihan.
- * - It helps CJK Extension B some if there are 3-byte values that cover
- *   the distance between them and Unihan.
- *   This also helps to jump among distant places in the BMP.
- * - Four-byte values are necessary to cover the rest of Unicode.
- *
- * Symmetrical lead byte counts are for convenience.
- * With an equal distribution of even and odd differences there is also
- * no advantage to asymmetrical lead byte counts.
- */
-#define SLOPE_SINGLE        80
-#define SLOPE_LEAD_2        42
-#define SLOPE_LEAD_3        3
-#define SLOPE_LEAD_4        1
-
-/* The difference value range for single-byters. */
-#define SLOPE_REACH_POS_1   SLOPE_SINGLE
-#define SLOPE_REACH_NEG_1   (-SLOPE_SINGLE)
-
-/* The difference value range for double-byters. */
-#define SLOPE_REACH_POS_2   (SLOPE_LEAD_2*SLOPE_TAIL_COUNT+(SLOPE_LEAD_2-1))
-#define SLOPE_REACH_NEG_2   (-SLOPE_REACH_POS_2-1)
-
-/* The difference value range for 3-byters. */
-#define SLOPE_REACH_POS_3   (SLOPE_LEAD_3*SLOPE_TAIL_COUNT*SLOPE_TAIL_COUNT+(SLOPE_LEAD_3-1)*SLOPE_TAIL_COUNT+(SLOPE_TAIL_COUNT-1))
-#define SLOPE_REACH_NEG_3   (-SLOPE_REACH_POS_3-1)
-
-/* The lead byte start values. */
-#define SLOPE_START_POS_2   (SLOPE_MIDDLE+SLOPE_SINGLE+1)
-#define SLOPE_START_POS_3   (SLOPE_START_POS_2+SLOPE_LEAD_2)
-
-#define SLOPE_START_NEG_2   (SLOPE_MIDDLE+SLOPE_REACH_NEG_1)
-#define SLOPE_START_NEG_3   (SLOPE_START_NEG_2-SLOPE_LEAD_2)
-
-/*
- * Integer division and modulo with negative numerators
- * yields negative modulo results and quotients that are one more than
- * what we need here.
- */
-#define NEGDIVMOD(n, d, m) { \
-    (m)=(n)%(d); \
-    (n)/=(d); \
-    if((m)<0) { \
-        --(n); \
-        (m)+=(d); \
-    } \
-}
-
-U_CFUNC UChar32
-u_writeIdenticalLevelRun(UChar32 prev, const UChar *s, int32_t length, icu::ByteSink &sink);
-
-#endif /* #if !UCONFIG_NO_COLLATION */
-
-#endif