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Unified Diff: icu46/source/i18n/bocsu.c

Issue 5516007: Check in the pristine copy of ICU 4.6... (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/
Patch Set: Created 10 years ago
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Index: icu46/source/i18n/bocsu.c
===================================================================
--- icu46/source/i18n/bocsu.c (revision 0)
+++ icu46/source/i18n/bocsu.c (revision 0)
@@ -0,0 +1,191 @@
+/*
+*******************************************************************************
+* Copyright (C) 2001-2003, International Business Machines
+* Corporation and others. All Rights Reserved.
+*******************************************************************************
+* file name: bocsu.c
+* encoding: US-ASCII
+* tab size: 8 (not used)
+* indentation:4
+*
+* Author: Markus W. Scherer
+*
+* Modification history:
+* 05/18/2001 weiv Made into separate module
+*/
+
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+#include "bocsu.h"
+
+/*
+ * encode one difference value -0x10ffff..+0x10ffff in 1..3 bytes,
+ * preserving lexical order
+ */
+U_CFUNC uint8_t *
+u_writeDiff(int32_t diff, uint8_t *p) {
+ if(diff>=SLOPE_REACH_NEG_1) {
+ if(diff<=SLOPE_REACH_POS_1) {
+ *p++=(uint8_t)(SLOPE_MIDDLE+diff);
+ } else if(diff<=SLOPE_REACH_POS_2) {
+ *p++=(uint8_t)(SLOPE_START_POS_2+(diff/SLOPE_TAIL_COUNT));
+ *p++=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);
+ } else if(diff<=SLOPE_REACH_POS_3) {
+ p[2]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);
+ diff/=SLOPE_TAIL_COUNT;
+ p[1]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);
+ *p=(uint8_t)(SLOPE_START_POS_3+(diff/SLOPE_TAIL_COUNT));
+ p+=3;
+ } else {
+ p[3]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);
+ diff/=SLOPE_TAIL_COUNT;
+ p[2]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);
+ diff/=SLOPE_TAIL_COUNT;
+ p[1]=(uint8_t)(SLOPE_MIN+diff%SLOPE_TAIL_COUNT);
+ *p=SLOPE_MAX;
+ p+=4;
+ }
+ } else {
+ int32_t m;
+
+ if(diff>=SLOPE_REACH_NEG_2) {
+ NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);
+ *p++=(uint8_t)(SLOPE_START_NEG_2+diff);
+ *p++=(uint8_t)(SLOPE_MIN+m);
+ } else if(diff>=SLOPE_REACH_NEG_3) {
+ NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);
+ p[2]=(uint8_t)(SLOPE_MIN+m);
+ NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);
+ p[1]=(uint8_t)(SLOPE_MIN+m);
+ *p=(uint8_t)(SLOPE_START_NEG_3+diff);
+ p+=3;
+ } else {
+ NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);
+ p[3]=(uint8_t)(SLOPE_MIN+m);
+ NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);
+ p[2]=(uint8_t)(SLOPE_MIN+m);
+ NEGDIVMOD(diff, SLOPE_TAIL_COUNT, m);
+ p[1]=(uint8_t)(SLOPE_MIN+m);
+ *p=SLOPE_MIN;
+ p+=4;
+ }
+ }
+ return p;
+}
+
+/* How many bytes would writeDiff() write? */
+static int32_t
+lengthOfDiff(int32_t diff) {
+ if(diff>=SLOPE_REACH_NEG_1) {
+ if(diff<=SLOPE_REACH_POS_1) {
+ return 1;
+ } else if(diff<=SLOPE_REACH_POS_2) {
+ return 2;
+ } else if(diff<=SLOPE_REACH_POS_3) {
+ return 3;
+ } else {
+ return 4;
+ }
+ } else {
+ if(diff>=SLOPE_REACH_NEG_2) {
+ return 2;
+ } else if(diff>=SLOPE_REACH_NEG_3) {
+ return 3;
+ } else {
+ return 4;
+ }
+ }
+}
+
+/*
+ * Encode the code points of a string as
+ * a sequence of byte-encoded differences (slope detection),
+ * preserving lexical order.
+ *
+ * Optimize the difference-taking for runs of Unicode text within
+ * small scripts:
+ *
+ * Most small scripts are allocated within aligned 128-blocks of Unicode
+ * code points. Lexical order is preserved if "prev" is always moved
+ * into the middle of such a block.
+ *
+ * Additionally, "prev" is moved from anywhere in the Unihan
+ * area into the middle of that area.
+ * Note that the identical-level run in a sort key is generated from
+ * NFD text - there are never Hangul characters included.
+ */
+U_CFUNC int32_t
+u_writeIdenticalLevelRun(const UChar *s, int32_t length, uint8_t *p) {
+ uint8_t *p0;
+ int32_t c, prev;
+ int32_t i;
+
+ prev=0;
+ p0=p;
+ i=0;
+ while(i<length) {
+ if(prev<0x4e00 || prev>=0xa000) {
+ prev=(prev&~0x7f)-SLOPE_REACH_NEG_1;
+ } else {
+ /*
+ * Unihan U+4e00..U+9fa5:
+ * double-bytes down from the upper end
+ */
+ prev=0x9fff-SLOPE_REACH_POS_2;
+ }
+
+ UTF_NEXT_CHAR(s, i, length, c);
+ p=u_writeDiff(c-prev, p);
+ prev=c;
+ }
+ return (int32_t)(p-p0);
+}
+
+U_CFUNC int32_t
+u_writeIdenticalLevelRunTwoChars(UChar32 first, UChar32 second, uint8_t *p) {
+ uint8_t *p0 = p;
+ if(first<0x4e00 || first>=0xa000) {
+ first=(first&~0x7f)-SLOPE_REACH_NEG_1;
+ } else {
+ /*
+ * Unihan U+4e00..U+9fa5:
+ * double-bytes down from the upper end
+ */
+ first=0x9fff-SLOPE_REACH_POS_2;
+ }
+
+ p=u_writeDiff(second-first, p);
+ return (int32_t)(p-p0);
+}
+
+/* How many bytes would writeIdenticalLevelRun() write? */
+U_CFUNC int32_t
+u_lengthOfIdenticalLevelRun(const UChar *s, int32_t length) {
+ int32_t c, prev;
+ int32_t i, runLength;
+
+ prev=0;
+ runLength=0;
+ i=0;
+ while(i<length) {
+ if(prev<0x4e00 || prev>=0xa000) {
+ prev=(prev&~0x7f)-SLOPE_REACH_NEG_1;
+ } else {
+ /*
+ * Unihan U+4e00..U+9fa5:
+ * double-bytes down from the upper end
+ */
+ prev=0x9fff-SLOPE_REACH_POS_2;
+ }
+
+ UTF_NEXT_CHAR(s, i, length, c);
+ runLength+=lengthOfDiff(c-prev);
+ prev=c;
+ }
+ return runLength;
+}
+
+#endif /* #if !UCONFIG_NO_COLLATION */
Property changes on: icu46/source/i18n/bocsu.c
___________________________________________________________________
Added: svn:eol-style
+ LF
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