5 *   Copyright (C) 2001-2014, International Business Machines
9 *   encoding:   US-ASCII
29  * encode one difference value -0x10ffff..+0x10ffff in 1..4 bytes,
33 u_writeDiff(int32_t diff, uint8_t *p) {  in u_writeDiff()  argument
34     if(diff>=SLOPE_REACH_NEG_1) {  in u_writeDiff()
35         if(diff<=SLOPE_REACH_POS_1) {  in u_writeDiff()
36             *p++=(uint8_t)(SLOPE_MIDDLE+diff);  in u_writeDiff()
37         } else if(diff<=SLOPE_REACH_POS_2) {  in u_writeDiff()
38             *p++=(uint8_t)(SLOPE_START_POS_2+(diff/SLOPE_TAIL_COUNT));  in u_writeDiff()
39             *p++=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);  in u_writeDiff()
40         } else if(diff<=SLOPE_REACH_POS_3) {  in u_writeDiff()
41             p[2]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);  in u_writeDiff()
42             diff/=SLOPE_TAIL_COUNT;  in u_writeDiff()
43             p[1]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);  in u_writeDiff()
44             *p=(uint8_t)(SLOPE_START_POS_3+(diff/SLOPE_TAIL_COUNT));  in u_writeDiff()
47             p[3]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);  in u_writeDiff()
48             diff/=SLOPE_TAIL_COUNT;  in u_writeDiff()
49             p[2]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);  in u_writeDiff()
50             diff/=SLOPE_TAIL_COUNT;  in u_writeDiff()
51             p[1]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);  in u_writeDiff()
58         if(diff>=SLOPE_REACH_NEG_2) {  in u_writeDiff()
59             NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);  in u_writeDiff()
60             *p++=(uint8_t)(SLOPE_START_NEG_2+diff);  in u_writeDiff()
62         } else if(diff>=SLOPE_REACH_NEG_3) {  in u_writeDiff()
63             NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);  in u_writeDiff()
65             NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);  in u_writeDiff()
67             *p=(uint8_t)(SLOPE_START_NEG_3+diff);  in u_writeDiff()
70             NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);  in u_writeDiff()
72             NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);  in u_writeDiff()
74             NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);  in u_writeDiff()
85  * a sequence of byte-encoded differences (slope detection),
88  * Optimize the difference-taking for runs of Unicode text within
91  * Most small scripts are allocated within aligned 128-blocks of Unicode
97  * Note that the identical-level run in a sort key is generated from
98  * NFD text - there are never Hangul characters included.
117         uint8_t *lastSafe=p+capacity-SLOPE_MAX_BYTES;  in u_writeIdenticalLevelRun()
120                 prev=(prev&~0x7f)-SLOPE_REACH_NEG_1;  in u_writeIdenticalLevelRun()
124                  * double-bytes down from the upper end  in u_writeIdenticalLevelRun()
126                 prev=0x9fff-SLOPE_REACH_POS_2;  in u_writeIdenticalLevelRun()
135                 p=u_writeDiff(c-prev, p);  in u_writeIdenticalLevelRun()
139         sink.Append(buffer, (int32_t)(p-reinterpret_cast<uint8_t *>(buffer)));  in u_writeIdenticalLevelRun()