353 lines
7.9 KiB
C++
353 lines
7.9 KiB
C++
/*
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*
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* Copyright (c) 2008-2016
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* String Algorithms Research Group
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* Institute of Information Engineering, Chinese Academy of Sciences (IIE-CAS)
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* National Engineering Laboratory for Information Security Technologies (NELIST)
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* All rights reserved
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*
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* Written by: LIU YANBING (liuyanbing@iie.ac.cn)
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* Last modification: 2016-06-03
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*
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* This code is the exclusive and proprietary property of IIE-CAS and NELIST.
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* Usage for direct or indirect commercial advantage is not allowed without
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* written permission from the authors.
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*
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*/
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#include "Int128IntervalIndex.h"
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#include <algorithm>
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#include <set>
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#include <cassert>
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#include <limits.h>
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using namespace std;
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//#define DEBUG_INT128_INTERVAL_INDEX
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bool operator<(const uint128_t& lhs, const uint128_t& rhs)
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{
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int i=1;
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while(i>=0 && lhs.I[i]==rhs.I[i]) --i;
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return (i>=0 && lhs.I[i]<rhs.I[i]);
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}
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bool operator>(const uint128_t& lhs, const uint128_t& rhs)
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{
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return rhs<lhs;
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}
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bool operator>=(const uint128_t& lhs, const uint128_t& rhs)
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{
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return !(lhs<rhs);
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}
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bool operator==(const uint128_t& lhs, const uint128_t& rhs)
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{
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for(int i=0; i<2; i++)
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{
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if(lhs.I[i]!=rhs.I[i]) return false;
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}
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return true;
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}
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bool operator!=(const uint128_t& lhs, const uint128_t& rhs)
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{
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return !(lhs==rhs);
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}
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//执行a-b，a为lhs，b为rhs
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uint128_t operator-(const uint128_t& lhs, const uint128_t& rhs)
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{
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uint128_t l = rhs;
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uint128_t h = lhs;
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unsigned long long I[2] = {0};
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if(h.I[0] < l.I[0])//低位的数更小，需要借位
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{
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I[0] = ULONG_MAX - (l.I[0] - h.I[0]);
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h.I[1]--;//被借位了，高位需要减1
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}
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else
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{
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I[0] = h.I[0] - l.I[0];
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}
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I[1] = h.I[1] - l.I[1];
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unsigned int a[4];
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a[3] = I[0] & 0xFFFFFFFF;
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a[2] = (I[0]>>32) & 0xFFFFFFFF;
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a[1] = I[1] & 0xFFFFFFFF;
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a[0] = (I[1]>>32) & 0xFFFFFFFF;
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uint128_t b(a);
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return b;
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}
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unsigned int ipv6_hash(const uint128_t * ip)
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{
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unsigned long long I=(ip->I[0])^(ip->I[1]);
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return (I&0xFFFFFFFF)^(I>>32);
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}
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CInt128IntervalIndex::CInt128IntervalIndex()
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{
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m_array=NULL;
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m_iEndPointsNum=0;
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m_pEndPoints=NULL;
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m_pIDPtr=NULL;
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m_pIDList=NULL;
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m_IndexForMaxInt=NULL;
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m_IndexForWholeInterval = NULL;
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}
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CInt128IntervalIndex::~CInt128IntervalIndex()
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{
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if(m_array!=NULL) delete [] m_array;
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if(this->m_pEndPoints!=NULL)
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{
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delete [] this->m_pEndPoints;
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}
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if(this->m_pIDList!=NULL)
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{
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delete [] this->m_pIDList;
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}
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if(this->m_pIDPtr!=NULL)
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{
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delete [] this->m_pIDPtr;
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}
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if(this->m_IndexForMaxInt!=NULL)
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{
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delete [] this->m_IndexForMaxInt;
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}
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if(this->m_IndexForWholeInterval != NULL)
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{
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delete [] this->m_IndexForWholeInterval;
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}
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}
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long long CInt128IntervalIndex::PreProcessing(const vector<uint128_t>& a, const vector<uint128_t>& b)
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{
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if(a.size()==0) return -1;
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m_is_single=true;
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for(unsigned int i=0; i<a.size(); i++)
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{
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if(a[i]!=b[i])
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{
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m_is_single=false;
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break;
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}
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}
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if(m_is_single)
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{
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return process_single(a);
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}
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else
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{
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return process_interval(a, b);
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}
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}
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long long CInt128IntervalIndex::process_single(const vector<uint128_t>& a)
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{
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long long mem_bytes=0;
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unsigned int num=a.size();
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unsigned int * keys =new unsigned int[num];
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unsigned int * values=new unsigned int[num];
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m_array=new uint128_t[num];
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mem_bytes+=(2*sizeof(unsigned int)+sizeof(uint128_t))*num;
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for(unsigned int i=0; i<num; i++)
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{
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keys[i]=ipv6_hash(&a[i]);
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values[i]=i;
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m_array[i]=a[i];
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}
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long long ret=m_ip_hash.init(keys, values, num);
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delete [] keys;
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delete [] values;
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if(ret<0) return -1;
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mem_bytes+=ret;
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return mem_bytes;
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}
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long long CInt128IntervalIndex::process_interval(const vector<uint128_t>& a, const vector<uint128_t>& b)
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{
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vector<uint128_t> A=a, B=b;
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long long iMemBytes=0;
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set<uint128_t> s;
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vector<unsigned int> IndexForMaxInt;
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vector<unsigned int> IndexForWholeInterval;
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for(int i=0, n=(int)A.size(); i<n; i++)
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{
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if(A[i]>B[i]) continue;
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if(B[i].is_all_ones())
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{
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IndexForMaxInt.push_back(i);
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--B[i];
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}
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++B[i]; // now A[i], B[i] is half closed interval.
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if(A[i]>=B[i]) continue;
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if(A[i].is_all_zeros() && B[i].is_all_ones())
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{
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IndexForWholeInterval.push_back(i);
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continue;
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}
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s.insert(A[i]);
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s.insert(B[i]);
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}
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m_IndexForWholeInterval=new unsigned int[IndexForWholeInterval.size()+1];
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m_IndexForWholeInterval[0]=IndexForWholeInterval.size();
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copy(IndexForWholeInterval.begin(), IndexForWholeInterval.end(), m_IndexForWholeInterval+1);
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iMemBytes+=(long long)(sizeof(unsigned int)*(IndexForWholeInterval.size()+1));
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m_IndexForMaxInt=new unsigned int[IndexForMaxInt.size()+1];
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m_IndexForMaxInt[0]=IndexForMaxInt.size();
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copy(IndexForMaxInt.begin(), IndexForMaxInt.end(), m_IndexForMaxInt+1);
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iMemBytes+=(long long)(sizeof(unsigned int)*(IndexForMaxInt.size()+1));
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this->m_iEndPointsNum=(long long)s.size();
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this->m_pEndPoints=new uint128_t[m_iEndPointsNum];
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copy(s.begin(), s.end(), m_pEndPoints);
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iMemBytes+=(long long)(m_iEndPointsNum*sizeof(uint128_t));
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vector<long long> count(m_iEndPointsNum, 0);
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for(int i=0, n=(int)A.size(); i<n; i++)
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{
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if(A[i]>=B[i] || (A[i].is_all_zeros() && B[i].is_all_ones())) continue;
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long long l=(int)(lower_bound(m_pEndPoints, m_pEndPoints+m_iEndPointsNum, A[i])-m_pEndPoints);
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long long h=(int)(lower_bound(m_pEndPoints, m_pEndPoints+m_iEndPointsNum, B[i])-m_pEndPoints);
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assert(m_pEndPoints[l]==A[i] && m_pEndPoints[h]==B[i]);
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for(long long j=l; j<h; j++) count[j]++;
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}
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m_pIDPtr=new long long[m_iEndPointsNum+1];
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m_pIDPtr[0]=0;
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for(long long i=0; i<m_iEndPointsNum; i++)
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{
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m_pIDPtr[i+1]=m_pIDPtr[i]+count[i];
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}
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iMemBytes+=(long long)((m_iEndPointsNum+1)*sizeof(unsigned int));
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m_pIDList=new unsigned int[m_pIDPtr[m_iEndPointsNum]];
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for(int i=0, n=(int)A.size(); i<n; i++)
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{
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if(A[i]>=B[i] || (A[i].is_all_zeros() && B[i].is_all_ones())) continue;
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long long l=(int)(lower_bound(m_pEndPoints, m_pEndPoints+m_iEndPointsNum, A[i])-m_pEndPoints);
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long long h=(int)(lower_bound(m_pEndPoints, m_pEndPoints+m_iEndPointsNum, B[i])-m_pEndPoints);
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assert(m_pEndPoints[l]==A[i] && m_pEndPoints[h]==B[i]);
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for(long long j=l; j<h; j++)
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{
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m_pIDList[m_pIDPtr[j]++]=i;
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}
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}
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iMemBytes+=(long long)(m_pIDPtr[m_iEndPointsNum]*sizeof(unsigned int));
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for(long long i=0; i<m_iEndPointsNum; i++)
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{
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m_pIDPtr[i]-=count[i];
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}
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int k=0;
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unsigned int t[4] = {0,0,0,0};
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for(unsigned int i=0; i<65536; i++)
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{
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t[3] = i;
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uint128_t x(t);
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x = x<<112;
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while(k<m_iEndPointsNum && x>=m_pEndPoints[k])
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k++;
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m_L[i] = (k>=1)? k-1 : 0;
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}
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m_L[65536]=m_iEndPointsNum-1;
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iMemBytes+=(long long)sizeof(m_L);
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#ifdef DEBUG_INT128_INTERVAL_INDEX
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printf("Int128 Interval Index membyte=%5.3lf (MB).\n", (double)iMemBytes/(1u<<20));
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#endif
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A.clear();
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B.clear();
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s.clear();
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IndexForMaxInt.clear();
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return iMemBytes;
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}
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int CInt128IntervalIndex::Find(const uint128_t * key, unsigned int * result, unsigned int size)
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{
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if(m_is_single)
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{
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return Find_single(key, result, size);
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}
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else
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{
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return Find_interval(key, result, size);
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}
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}
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int CInt128IntervalIndex::Find_single(const uint128_t * key, unsigned int * result, unsigned int size)
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{
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unsigned int h=ipv6_hash(key);
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int ret=m_ip_hash.find(h, result, size);
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int j=0;
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for(int i=0; i<ret; i++)
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{
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if(*key==m_array[result[i]]) result[j++]=result[i];
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}
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return j;
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}
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int CInt128IntervalIndex::Find_interval(const uint128_t * key, unsigned int * result, unsigned int size)
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{
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if(key->is_all_ones())
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{
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unsigned int s=m_IndexForMaxInt[0];
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if(s>size) s=size;
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for(unsigned int i=1; i<=s; i++) *result++=m_IndexForMaxInt[i];
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return s;
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}
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else
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{
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unsigned int s=m_IndexForWholeInterval[0];
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if(s>size) s=size;
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for(unsigned int i=1; i<=s; i++)
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{
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*result++=m_IndexForWholeInterval[i];
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}
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size-=s;
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uint128_t t = (*key)>>112;
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unsigned int k = t.I[0]&0xffff;
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long long l=m_L[k], h=m_L[k+1];
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long long m=0;
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while(l<=h && m<m_iEndPointsNum)
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{
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m=(l+h)>>1;
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if(*key>=m_pEndPoints[m]) l=m+1;
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else h=m-1;
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}
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if(h>=m_L[k] && h<m_iEndPointsNum)
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{
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long long n=m_pIDPtr[h+1]-m_pIDPtr[h];
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if(n>size) n=size;
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unsigned int * id_list=m_pIDList+m_pIDPtr[h];
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for(unsigned int i=0; i<n; i++) *result++=*id_list++;
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s+=n;
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}
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return s;
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}
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}
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