535 lines
17 KiB
C
535 lines
17 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: ucol_wgt.c
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2001mar08
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* created by: Markus W. Scherer
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*
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* This file contains code for allocating n collation element weights
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* between two exclusive limits.
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* It is used only internally by ucol_bld.
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*/
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#ifdef UCOL_DEBUG
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# include <stdio.h>
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#endif
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/* we are using qsort() */
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#include <stdlib.h>
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#include "unicode/utypes.h"
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#include "cmemory.h"
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#include "ucol_wgt.h"
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#if defined(UCOL_DEBUG) && defined(WIN32)
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/* turn off "unreferenced formal parameter" */
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# pragma warning(disable: 4100)
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#endif
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/* collation element weight allocation -------------------------------------- */
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/* helper functions for CE weights */
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static int32_t
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lengthOfWeight(uint32_t weight) {
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if((weight&0xffffff)==0) {
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return 1;
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} else if((weight&0xffff)==0) {
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return 2;
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} else if((weight&0xff)==0) {
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return 3;
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} else {
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return 4;
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}
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}
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static uint32_t
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getWeightTrail(uint32_t weight, int32_t length) {
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return (uint32_t)(weight>>(8*(4-length)))&0xff;
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}
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static uint32_t
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setWeightTrail(uint32_t weight, int32_t length, uint32_t trail) {
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length=8*(4-length);
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return (uint32_t)((weight&(0xffffff00<<length))|(trail<<length));
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}
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static uint32_t
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getWeightByte(uint32_t weight, int32_t index) {
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return getWeightTrail(weight, index); /* same calculation */
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}
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static uint32_t
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setWeightByte(uint32_t weight, int32_t index, uint32_t byte) {
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uint32_t mask; /* 0xffffffff except a 00 "hole" for the index-th byte */
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index*=8;
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mask=0xffffffff>>index;
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index=32-index;
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mask|=0xffffff00<<index;
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return (uint32_t)((weight&mask)|(byte<<index));
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}
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static uint32_t
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truncateWeight(uint32_t weight, int32_t length) {
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return (uint32_t)(weight&(0xffffffff<<(8*(4-length))));
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}
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static uint32_t
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incWeightTrail(uint32_t weight, int32_t length) {
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return (uint32_t)(weight+(1UL<<(8*(4-length))));
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}
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static uint32_t
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decWeightTrail(uint32_t weight, int32_t length) {
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return (uint32_t)(weight-(1UL<<(8*(4-length))));
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}
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static uint32_t
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incWeight(uint32_t weight, int32_t length) {
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uint32_t byte;
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for(;;) {
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byte=getWeightByte(weight, length);
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if(byte<0xff) {
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return setWeightByte(weight, length, byte+1);
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} else {
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/* roll over, set this byte to 2 and increment the previous one */
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weight=setWeightByte(weight, length, 2);
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--length;
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}
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}
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}
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static int32_t
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lengthenRange(WeightRange *range) {
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int32_t length;
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length=range->length2+1;
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range->start=setWeightTrail(range->start, length, 2);
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range->end=setWeightTrail(range->end, length, 0xff);
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range->count2*=254;
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range->length2=length;
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return length;
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}
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/* for qsort: sort ranges in weight order */
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static int
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compareRanges(const void *left, const void *right) {
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uint32_t l, r;
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l=((const WeightRange *)left)->start;
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r=((const WeightRange *)right)->start;
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if(l<r) {
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return -1;
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} else if(l>r) {
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return 1;
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} else {
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return 0;
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}
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}
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/*
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* take two CE weights and calculate the
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* possible ranges of weights between the two limits, excluding them
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* for weights with up to 4 bytes there are up to 2*4-1=7 ranges
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*/
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static int32_t
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getWeightRanges(uint32_t lowerLimit, uint32_t upperLimit, WeightRange ranges[7]) {
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WeightRange lower[5], middle, upper[5]; /* [0] and [1] are not used - this simplifies indexing */
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uint32_t weight, trail;
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int32_t length, lowerLength, upperLength, rangeCount;
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/* assume that both lowerLimit & upperLimit are not 0 */
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/* get the lengths of the limits */
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lowerLength=lengthOfWeight(lowerLimit);
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upperLength=lengthOfWeight(upperLimit);
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#ifdef UCOL_DEBUG
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printf("length of lower limit 0x%08lx is %ld\n", lowerLimit, lowerLength);
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printf("length of upper limit 0x%08lx is %ld\n", upperLimit, upperLength);
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#endif
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if(lowerLimit>=upperLimit) {
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#ifdef UCOL_DEBUG
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printf("error: no space between lower & upper limits\n");
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#endif
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return 0;
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}
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/* check that neither is a prefix of the other */
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if(lowerLength<upperLength) {
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if(lowerLimit==truncateWeight(upperLimit, lowerLength)) {
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#ifdef UCOL_DEBUG
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printf("error: lower limit 0x%08lx is a prefix of upper limit 0x%08lx\n", lowerLimit, upperLimit);
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#endif
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return 0;
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}
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}
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/* if the upper limit is a prefix of the lower limit then the earlier test lowerLimit>=upperLimit has caught it */
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/* reset local variables */
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uprv_memset(lower, 0, sizeof(lower));
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uprv_memset(&middle, 0, sizeof(middle));
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uprv_memset(upper, 0, sizeof(upper));
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/*
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* With the limit lengths of 1..4, there are up to 7 ranges for allocation:
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* range minimum length
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* lower[4] 4
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* lower[3] 3
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* lower[2] 2
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* middle 1
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* upper[2] 2
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* upper[3] 3
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* upper[4] 4
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*
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* We are now going to calculate up to 7 ranges.
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* Some of them will typically overlap, so we will then have to merge and eliminate ranges.
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*/
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weight=lowerLimit;
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for(length=lowerLength; length>=2; --length) {
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trail=getWeightTrail(weight, length);
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if(trail<0xff) {
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lower[length].start=incWeightTrail(weight, length);
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lower[length].end=setWeightTrail(weight, length, 0xff);
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lower[length].length=length;
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lower[length].count=0xff-trail;
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}
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weight=truncateWeight(weight, length-1);
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}
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middle.start=incWeightTrail(weight, 1);
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weight=upperLimit;
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for(length=upperLength; length>=2; --length) {
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trail=getWeightTrail(weight, length);
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if(trail>2) {
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upper[length].start=setWeightTrail(weight, length, 2);
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upper[length].end=decWeightTrail(weight, length);
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upper[length].length=length;
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upper[length].count=trail-2;
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}
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weight=truncateWeight(weight, length-1);
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}
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middle.end=decWeightTrail(weight, 1);
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/* set the middle range */
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middle.length=1;
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if(middle.end>=middle.start) {
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middle.count=(int32_t)((middle.end-middle.start)>>24)+1;
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} else {
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/* eliminate overlaps */
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uint32_t start, end;
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/* remove the middle range */
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middle.count=0;
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/* reduweight or remove the lower ranges that go beyond upperLimit */
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for(length=4; length>=2; --length) {
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if(lower[length].count>0 && upper[length].count>0) {
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start=upper[length].start;
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end=lower[length].end;
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if(end>=start || incWeight(end, length)==start) {
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/* lower and upper ranges collide or are directly adjacent: merge these two and remove all shorter ranges */
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start=lower[length].start;
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end=lower[length].end=upper[length].end;
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/* merging directly adjacent ranges needs to subtract the 0/1 gaps in between; it may result in a range with count>254 */
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lower[length].count=
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(int32_t)(getWeightTrail(end, length)-getWeightTrail(start, length)+1+
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254*(getWeightByte(end, length-1)-getWeightByte(start, length-1)));
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upper[length].count=0;
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while(--length>=2) {
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lower[length].count=upper[length].count=0;
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}
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break;
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}
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}
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}
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}
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#ifdef UCOL_DEBUG
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/* print ranges */
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for(length=4; length>=2; --length) {
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if(lower[length].count>0) {
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printf("lower[%ld] .start=0x%08lx .end=0x%08lx .count=%ld\n", length, lower[length].start, lower[length].end, lower[length].count);
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}
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}
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if(middle.count>0) {
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printf("middle .start=0x%08lx .end=0x%08lx .count=%ld\n", middle.start, middle.end, middle.count);
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}
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for(length=2; length<=4; ++length) {
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if(upper[length].count>0) {
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printf("upper[%ld] .start=0x%08lx .end=0x%08lx .count=%ld\n", length, upper[length].start, upper[length].end, upper[length].count);
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}
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}
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#endif
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/* copy the ranges, shortest first, into the result array */
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rangeCount=0;
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if(middle.count>0) {
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uprv_memcpy(ranges, &middle, sizeof(WeightRange));
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rangeCount=1;
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}
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for(length=2; length<=4; ++length) {
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/* copy upper first so that later the middle range is more likely the first one to use */
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if(upper[length].count>0) {
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uprv_memcpy(ranges+rangeCount, upper+length, sizeof(WeightRange));
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++rangeCount;
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}
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if(lower[length].count>0) {
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uprv_memcpy(ranges+rangeCount, lower+length, sizeof(WeightRange));
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++rangeCount;
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}
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}
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return rangeCount;
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}
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/*
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* call getWeightRanges and then determine heuristically
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* which ranges to use for a given number of weights between (excluding)
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* two limits
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*/
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U_CFUNC int32_t
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ucol_allocWeights(uint32_t lowerLimit, uint32_t upperLimit, uint32_t n, WeightRange ranges[7]) {
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/* 254 to the power of index */
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static const uint32_t powers254[5]={
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1, 254, 254*254, 254UL*254*254, 254UL*254*254*254
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};
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uint32_t lengthCounts[6]; /* [0] unused, [5] to make index checks unnecessary */
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uint32_t maxCount;
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int32_t i, rangeCount, minLength, maxLength;
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#ifdef UCOL_DEBUG
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puts("");
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#endif
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rangeCount=getWeightRanges(lowerLimit, upperLimit, ranges);
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if(rangeCount<=0) {
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#ifdef UCOL_DEBUG
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printf("error: unable to get Weight ranges\n");
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#endif
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return 0;
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}
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/* what is the maximum number of weights with these ranges? */
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maxCount=0;
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for(i=0; i<rangeCount; ++i) {
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maxCount+=(uint32_t)ranges[i].count*powers254[4-ranges[i].length];
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}
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if(maxCount>=n) {
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#ifdef UCOL_DEBUG
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printf("the maximum number of %lu weights is sufficient for n=%lu\n", maxCount, n);
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#endif
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} else {
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#ifdef UCOL_DEBUG
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printf("error: the maximum number of %lu weights is insufficient for n=%lu\n", maxCount, n);
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#endif
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return 0;
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}
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/* set the length2 and count2 fields */
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for(i=0; i<rangeCount; ++i) {
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ranges[i].length2=ranges[i].length;
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ranges[i].count2=(uint32_t)ranges[i].count;
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}
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/* try until we find suitably large ranges */
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for(;;) {
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/* get the smallest number of bytes in a range */
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minLength=ranges[0].length2;
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/* sum up the number of elements that fit into ranges of each byte length */
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uprv_memset(lengthCounts, 0, sizeof(lengthCounts));
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for(i=0; i<rangeCount; ++i) {
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lengthCounts[ranges[i].length2]+=ranges[i].count2;
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}
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/* now try to allocate n elements in the available short ranges */
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if(n<=(lengthCounts[minLength]+lengthCounts[minLength+1])) {
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/* trivial cases, use the first few ranges */
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maxCount=0;
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rangeCount=0;
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do {
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maxCount+=ranges[rangeCount].count2;
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++rangeCount;
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} while(n>maxCount);
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#ifdef UCOL_DEBUG
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printf("take first %ld ranges\n", rangeCount);
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#endif
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break;
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} else if(n<=ranges[0].count2*254) {
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/* easy case, just make this one range large enough by lengthening it once more, possibly split it */
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uint32_t count1, count2, power254_1, power254;
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rangeCount=1;
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maxLength=minLength+1;
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/* calculate how to split the range between maxLength-1 (count1) and maxLength (count2) */
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power254_1=powers254[minLength-ranges[0].length];
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power254=power254_1*254;
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count2=(n+power254-1)/power254;
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count1=ranges[0].count-count2;
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/* split the range */
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#ifdef UCOL_DEBUG
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printf("split the first range %ld:%ld\n", count1, count2);
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#endif
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if(count1<1) {
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/* lengthen the entire range to maxLength */
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lengthenRange(ranges);
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} else {
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/* really split the range */
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uint32_t byte;
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/* create a new range with the end and initial and current length of the old one */
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rangeCount=2;
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ranges[1].end=ranges[0].end;
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ranges[1].length=ranges[0].length;
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ranges[1].length2=minLength;
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/* set the end of the first range according to count1 */
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i=ranges[0].length;
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byte=getWeightByte(ranges[0].start, i)+count1-1;
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/* ranges[0].count and count1 may be >254 from merging adjacent ranges; byte>0xff is possible */
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if(byte<=0xff) {
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ranges[0].end=setWeightByte(ranges[0].start, i, byte);
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} else /* byte>0xff */ {
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ranges[0].end=setWeightByte(incWeight(ranges[0].start, i-1), i, byte-254);
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}
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/* set the bytes in the end weight at length+1..length2 to 0xff */
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ranges[0].end|=(0xffffffff>>(8*i))&(0xffffffff<<(8*(4-minLength)));
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/* set the start of the second range to immediately follow the end of the first one */
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ranges[1].start=incWeight(ranges[0].end, minLength);
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/* set the count values (informational) */
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ranges[0].count=count1;
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ranges[1].count=count2;
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ranges[0].count2=count1*power254_1;
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ranges[1].count2=count2*power254_1; /* will be *254 when lengthened */
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/* lengthen the second range to maxLength */
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lengthenRange(ranges+1);
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}
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break;
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}
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/* no good match, lengthen all minLength ranges and iterate */
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#ifdef UCOL_DEBUG
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printf("lengthen the short ranges from %ld bytes to %ld and iterate\n", minLength, minLength+1);
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#endif
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for(i=0; ranges[i].length2==minLength; ++i) {
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lengthenRange(ranges+i);
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}
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}
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if(rangeCount>1) {
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/* sort the ranges by weight values */
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qsort(ranges, rangeCount, sizeof(WeightRange), compareRanges);
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}
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#ifdef UCOL_DEBUG
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puts("final ranges:");
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for(i=0; i<rangeCount; ++i) {
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printf("ranges[%ld] .start=0x%08lx .end=0x%08lx .length=%ld .length2=%ld .count=%ld .count2=%lu\n",
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i, ranges[i].start, ranges[i].end, ranges[i].length, ranges[i].length2, ranges[i].count, ranges[i].count2);
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}
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#endif
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return rangeCount;
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}
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/*
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* given a set of ranges calculated by ucol_allocWeights(),
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* iterate through the weights
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*/
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U_CFUNC uint32_t
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ucol_nextWeight(WeightRange ranges[], int32_t *pRangeCount) {
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if(*pRangeCount<=0) {
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return 0xffffffff;
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} else {
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uint32_t weight;
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/* get the next weight */
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weight=ranges[0].start;
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if(weight==ranges[0].end) {
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/* this range is finished, remove it and move the following ones up */
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if(--*pRangeCount>0) {
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uprv_memmove(ranges, ranges+1, *pRangeCount*sizeof(WeightRange));
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}
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} else {
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/* increment the weight for the next value */
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ranges[0].start=incWeight(weight, ranges[0].length2);
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}
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return weight;
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}
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}
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#ifdef UCOL_DEBUG
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static void
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testAlloc(uint32_t lowerLimit, uint32_t upperLimit, uint32_t n, UBool enumerate) {
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WeightRange ranges[8];
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int32_t rangeCount;
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rangeCount=ucol_allocWeights(lowerLimit, upperLimit, n, ranges);
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if(enumerate) {
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uint32_t weight;
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while(n>0) {
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weight=ucol_nextWeight(ranges, &rangeCount);
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if(weight==0xffffffff) {
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printf("error: 0xffffffff with %lu more weights to go\n", n);
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break;
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}
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printf(" 0x%08lx\n", weight);
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--n;
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}
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}
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}
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extern int
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main(int argc, const char *argv[]) {
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#if 0
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#endif
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testAlloc(0x364214fc, 0x44b87d23, 5, FALSE);
|
|
testAlloc(0x36421500, 0x44b87d23, 5, FALSE);
|
|
testAlloc(0x36421500, 0x44b87d23, 20, FALSE);
|
|
testAlloc(0x36421500, 0x44b87d23, 13700, FALSE);
|
|
testAlloc(0x36421500, 0x38b87d23, 1, FALSE);
|
|
testAlloc(0x36421500, 0x38b87d23, 20, FALSE);
|
|
testAlloc(0x36421500, 0x38b87d23, 200, TRUE);
|
|
testAlloc(0x36421500, 0x38b87d23, 13700, FALSE);
|
|
testAlloc(0x36421500, 0x37b87d23, 13700, FALSE);
|
|
testAlloc(0x36ef1500, 0x37b87d23, 13700, FALSE);
|
|
testAlloc(0x36421500, 0x36b87d23, 13700, FALSE);
|
|
testAlloc(0x36b87122, 0x36b87d23, 13700, FALSE);
|
|
testAlloc(0x49000000, 0x4a600000, 13700, FALSE);
|
|
testAlloc(0x9fffffff, 0xd0000000, 13700, FALSE);
|
|
testAlloc(0x9fffffff, 0xd0000000, 67400, FALSE);
|
|
testAlloc(0x9fffffff, 0xa0030000, 67400, FALSE);
|
|
testAlloc(0x9fffffff, 0xa0030000, 40000, FALSE);
|
|
testAlloc(0xa0000000, 0xa0030000, 40000, FALSE);
|
|
testAlloc(0xa0031100, 0xa0030000, 40000, FALSE);
|
|
#if 0
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
#endif
|