707 lines
21 KiB
C
Executable File
707 lines
21 KiB
C
Executable File
#include "bdz.h"
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#include "cmph_structs.h"
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#include "bdz_structs.h"
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#include "hash.h"
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#include "bitbool.h"
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#include <math.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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// #define DEBUG
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#include "debug.h"
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#define UNASSIGNED 3U
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#define NULL_EDGE 0xffffffff
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//cmph_uint32 ngrafos = 0;
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//cmph_uint32 ngrafos_aciclicos = 0;
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// table used for looking up the number of assigned vertices a 8-bit integer
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const cmph_uint8 bdz_lookup_table[] =
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{
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
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2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 1, 1, 1, 0
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};
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typedef struct
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{
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cmph_uint32 vertices[3];
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cmph_uint32 next_edges[3];
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}bdz_edge_t;
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typedef cmph_uint32 * bdz_queue_t;
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static void bdz_alloc_queue(bdz_queue_t * queuep, cmph_uint32 nedges)
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{
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(*queuep)=(cmph_uint32 *)malloc(nedges*sizeof(cmph_uint32));
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};
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static void bdz_free_queue(bdz_queue_t * queue)
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{
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free(*queue);
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};
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typedef struct
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{
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cmph_uint32 nedges;
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bdz_edge_t * edges;
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cmph_uint32 * first_edge;
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cmph_uint8 * vert_degree;
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}bdz_graph3_t;
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static void bdz_alloc_graph3(bdz_graph3_t * graph3, cmph_uint32 nedges, cmph_uint32 nvertices)
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{
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graph3->edges=(bdz_edge_t *)malloc(nedges*sizeof(bdz_edge_t));
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graph3->first_edge=(cmph_uint32 *)malloc(nvertices*sizeof(cmph_uint32));
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graph3->vert_degree=(cmph_uint8 *)malloc((size_t)nvertices);
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};
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static void bdz_init_graph3(bdz_graph3_t * graph3, cmph_uint32 nedges, cmph_uint32 nvertices)
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{
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memset(graph3->first_edge,0xff,nvertices*sizeof(cmph_uint32));
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memset(graph3->vert_degree,0,(size_t)nvertices);
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graph3->nedges=0;
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};
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static void bdz_free_graph3(bdz_graph3_t *graph3)
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{
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free(graph3->edges);
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free(graph3->first_edge);
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free(graph3->vert_degree);
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};
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static void bdz_partial_free_graph3(bdz_graph3_t *graph3)
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{
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free(graph3->first_edge);
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free(graph3->vert_degree);
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graph3->first_edge = NULL;
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graph3->vert_degree = NULL;
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};
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static void bdz_add_edge(bdz_graph3_t * graph3, cmph_uint32 v0, cmph_uint32 v1, cmph_uint32 v2)
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{
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graph3->edges[graph3->nedges].vertices[0]=v0;
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graph3->edges[graph3->nedges].vertices[1]=v1;
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graph3->edges[graph3->nedges].vertices[2]=v2;
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graph3->edges[graph3->nedges].next_edges[0]=graph3->first_edge[v0];
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graph3->edges[graph3->nedges].next_edges[1]=graph3->first_edge[v1];
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graph3->edges[graph3->nedges].next_edges[2]=graph3->first_edge[v2];
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graph3->first_edge[v0]=graph3->first_edge[v1]=graph3->first_edge[v2]=graph3->nedges;
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graph3->vert_degree[v0]++;
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graph3->vert_degree[v1]++;
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graph3->vert_degree[v2]++;
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graph3->nedges++;
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};
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static void bdz_dump_graph(bdz_graph3_t* graph3, cmph_uint32 nedges, cmph_uint32 nvertices)
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{
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cmph_uint32 i;
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for(i=0;i<nedges;i++){
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printf("\nedge %d %d %d %d ",i,graph3->edges[i].vertices[0],
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graph3->edges[i].vertices[1],graph3->edges[i].vertices[2]);
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printf(" nexts %d %d %d",graph3->edges[i].next_edges[0],
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graph3->edges[i].next_edges[1],graph3->edges[i].next_edges[2]);
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};
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#ifdef DEBUG
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for(i=0;i<nvertices;i++){
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printf("\nfirst for vertice %d %d ",i,graph3->first_edge[i]);
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};
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#endif
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};
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static void bdz_remove_edge(bdz_graph3_t * graph3, cmph_uint32 curr_edge)
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{
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cmph_uint32 i,j=0,vert,edge1,edge2;
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for(i=0;i<3;i++){
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vert=graph3->edges[curr_edge].vertices[i];
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edge1=graph3->first_edge[vert];
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edge2=NULL_EDGE;
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while(edge1!=curr_edge&&edge1!=NULL_EDGE){
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edge2=edge1;
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if(graph3->edges[edge1].vertices[0]==vert){
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j=0;
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} else if(graph3->edges[edge1].vertices[1]==vert){
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j=1;
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} else
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j=2;
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edge1=graph3->edges[edge1].next_edges[j];
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};
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if(edge1==NULL_EDGE){
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printf("\nerror remove edge %d dump graph",curr_edge);
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bdz_dump_graph(graph3,graph3->nedges,graph3->nedges+graph3->nedges/4);
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exit(-1);
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};
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if(edge2!=NULL_EDGE){
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graph3->edges[edge2].next_edges[j] =
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graph3->edges[edge1].next_edges[i];
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} else
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graph3->first_edge[vert]=
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graph3->edges[edge1].next_edges[i];
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graph3->vert_degree[vert]--;
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};
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};
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static int bdz_generate_queue(cmph_uint32 nedges, cmph_uint32 nvertices, bdz_queue_t queue, bdz_graph3_t* graph3)
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{
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cmph_uint32 i,v0,v1,v2;
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cmph_uint32 queue_head=0,queue_tail=0;
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cmph_uint32 curr_edge;
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cmph_uint32 tmp_edge;
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cmph_uint8 * marked_edge = (cmph_uint8 *)malloc((size_t)(nedges >> 3) + 1);
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memset(marked_edge, 0, (size_t)(nedges >> 3) + 1);
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for(i=0;i<nedges;i++){
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v0=graph3->edges[i].vertices[0];
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v1=graph3->edges[i].vertices[1];
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v2=graph3->edges[i].vertices[2];
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if(graph3->vert_degree[v0]==1 ||
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graph3->vert_degree[v1]==1 ||
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graph3->vert_degree[v2]==1){
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if(!GETBIT(marked_edge,i)) {
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queue[queue_head++]=i;
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SETBIT(marked_edge,i);
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}
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};
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};
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DEBUGP("Queue head %d Queue tail %d\n", queue_head, queue_tail);
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#ifdef DEBUG
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bdz_dump_graph(graph3,graph3->nedges,graph3->nedges+graph3->nedges/4);
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#endif
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while(queue_tail!=queue_head){
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curr_edge=queue[queue_tail++];
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bdz_remove_edge(graph3,curr_edge);
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DEBUGP("Removing edge %d\n", curr_edge);
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v0=graph3->edges[curr_edge].vertices[0];
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v1=graph3->edges[curr_edge].vertices[1];
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v2=graph3->edges[curr_edge].vertices[2];
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if(graph3->vert_degree[v0]==1 ) {
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tmp_edge=graph3->first_edge[v0];
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if(!GETBIT(marked_edge,tmp_edge)) {
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queue[queue_head++]=tmp_edge;
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SETBIT(marked_edge,tmp_edge);
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};
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};
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if(graph3->vert_degree[v1]==1) {
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tmp_edge=graph3->first_edge[v1];
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if(!GETBIT(marked_edge,tmp_edge)){
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queue[queue_head++]=tmp_edge;
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SETBIT(marked_edge,tmp_edge);
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};
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};
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if(graph3->vert_degree[v2]==1){
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tmp_edge=graph3->first_edge[v2];
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if(!GETBIT(marked_edge,tmp_edge)){
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queue[queue_head++]=tmp_edge;
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SETBIT(marked_edge,tmp_edge);
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};
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};
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};
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free(marked_edge);
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return (int)(queue_head-nedges);/* returns 0 if successful otherwies return negative number*/
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};
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static int bdz_mapping(cmph_config_t *mph, bdz_graph3_t* graph3, bdz_queue_t queue);
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static void assigning(bdz_config_data_t *bdz, bdz_graph3_t* graph3, bdz_queue_t queue);
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static void ranking(bdz_config_data_t *bdz);
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static cmph_uint32 rank(cmph_uint32 b, cmph_uint32 * ranktable, cmph_uint8 * g, cmph_uint32 vertex);
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bdz_config_data_t *bdz_config_new(void)
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{
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bdz_config_data_t *bdz;
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bdz = (bdz_config_data_t *)malloc(sizeof(bdz_config_data_t));
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if (!bdz) return NULL;
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memset(bdz, 0, sizeof(bdz_config_data_t));
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bdz->hashfunc = CMPH_HASH_JENKINS;
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bdz->g = NULL;
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bdz->hl = NULL;
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bdz->k = 0; //kth index in ranktable, $k = log_2(n=3r)/\varepsilon$
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bdz->b = 7; // number of bits of k
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bdz->ranktablesize = 0; //number of entries in ranktable, $n/k +1$
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bdz->ranktable = NULL; // rank table
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return bdz;
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}
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void bdz_config_destroy(cmph_config_t *mph)
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{
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bdz_config_data_t *data = (bdz_config_data_t *)mph->data;
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DEBUGP("Destroying algorithm dependent data\n");
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free(data);
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}
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void bdz_config_set_b(cmph_config_t *mph, cmph_uint32 b)
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{
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bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
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if (b <= 2 || b > 10) b = 7; // validating restrictions over parameter b.
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bdz->b = (cmph_uint8)b;
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DEBUGP("b: %u\n", b);
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}
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void bdz_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs)
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{
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bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
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CMPH_HASH *hashptr = hashfuncs;
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cmph_uint32 i = 0;
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while(*hashptr != CMPH_HASH_COUNT)
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{
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if (i >= 1) break; //bdz only uses one linear hash function
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bdz->hashfunc = *hashptr;
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++i, ++hashptr;
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}
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}
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cmph_t *bdz_new(cmph_config_t *mph, double c)
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{
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cmph_t *mphf = NULL;
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bdz_data_t *bdzf = NULL;
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cmph_uint32 iterations;
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bdz_queue_t edges;
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bdz_graph3_t graph3;
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bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
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#ifdef CMPH_TIMING
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double construction_time_begin = 0.0;
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double construction_time = 0.0;
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ELAPSED_TIME_IN_SECONDS(&construction_time_begin);
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#endif
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if (c == 0) c = 1.23; // validating restrictions over parameter c.
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DEBUGP("c: %f\n", c);
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bdz->m = mph->key_source->nkeys;
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bdz->r = (cmph_uint32)ceil((c * mph->key_source->nkeys)/3);
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if ((bdz->r % 2) == 0) bdz->r+=1;
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if (bdz->r == 1) { // workaround for small key sets
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bdz->r = 3;
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}
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bdz->n = 3*bdz->r;
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bdz->k = (1U << bdz->b);
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DEBUGP("b: %u -- k: %u\n", bdz->b, bdz->k);
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bdz->ranktablesize = (cmph_uint32)ceil(bdz->n/(double)bdz->k);
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DEBUGP("ranktablesize: %u\n", bdz->ranktablesize);
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bdz_alloc_graph3(&graph3, bdz->m, bdz->n);
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bdz_alloc_queue(&edges,bdz->m);
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DEBUGP("Created hypergraph\n");
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DEBUGP("m (edges): %u n (vertices): %u r: %u c: %f \n", bdz->m, bdz->n, bdz->r, c);
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// Mapping step
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iterations = 1000;
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if (mph->verbosity)
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{
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fprintf(stderr, "Entering mapping step for mph creation of %u keys with graph sized %u\n", bdz->m, bdz->n);
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}
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while(1)
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{
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int ok;
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DEBUGP("linear hash function \n");
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bdz->hl = hash_state_new(bdz->hashfunc, 15);
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ok = bdz_mapping(mph, &graph3, edges);
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//ok = 0;
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if (!ok)
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{
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--iterations;
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hash_state_destroy(bdz->hl);
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bdz->hl = NULL;
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DEBUGP("%u iterations remaining\n", iterations);
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if (mph->verbosity)
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{
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fprintf(stderr, "acyclic graph creation failure - %u iterations remaining\n", iterations);
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}
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if (iterations == 0) break;
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}
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else break;
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}
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if (iterations == 0)
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{
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bdz_free_queue(&edges);
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bdz_free_graph3(&graph3);
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return NULL;
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}
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bdz_partial_free_graph3(&graph3);
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// Assigning step
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if (mph->verbosity)
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{
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fprintf(stderr, "Entering assigning step for mph creation of %u keys with graph sized %u\n", bdz->m, bdz->n);
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}
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assigning(bdz, &graph3, edges);
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bdz_free_queue(&edges);
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bdz_free_graph3(&graph3);
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if (mph->verbosity)
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{
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fprintf(stderr, "Entering ranking step for mph creation of %u keys with graph sized %u\n", bdz->m, bdz->n);
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}
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ranking(bdz);
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#ifdef CMPH_TIMING
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ELAPSED_TIME_IN_SECONDS(&construction_time);
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#endif
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mphf = (cmph_t *)malloc(sizeof(cmph_t));
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mphf->algo = mph->algo;
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bdzf = (bdz_data_t *)malloc(sizeof(bdz_data_t));
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bdzf->g = bdz->g;
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bdz->g = NULL; //transfer memory ownership
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bdzf->hl = bdz->hl;
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bdz->hl = NULL; //transfer memory ownership
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bdzf->ranktable = bdz->ranktable;
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bdz->ranktable = NULL; //transfer memory ownership
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bdzf->ranktablesize = bdz->ranktablesize;
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bdzf->k = bdz->k;
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bdzf->b = bdz->b;
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bdzf->n = bdz->n;
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bdzf->m = bdz->m;
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bdzf->r = bdz->r;
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mphf->data = bdzf;
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mphf->size = bdz->m;
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DEBUGP("Successfully generated minimal perfect hash\n");
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if (mph->verbosity)
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{
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fprintf(stderr, "Successfully generated minimal perfect hash function\n");
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}
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#ifdef CMPH_TIMING
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register cmph_uint32 space_usage = bdz_packed_size(mphf)*8;
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register cmph_uint32 keys_per_bucket = 1;
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construction_time = construction_time - construction_time_begin;
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fprintf(stdout, "%u\t%.2f\t%u\t%.4f\t%.4f\n", bdz->m, bdz->m/(double)bdz->n, keys_per_bucket, construction_time, space_usage/(double)bdz->m);
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#endif
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return mphf;
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}
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static int bdz_mapping(cmph_config_t *mph, bdz_graph3_t* graph3, bdz_queue_t queue)
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{
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cmph_uint32 e;
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int cycles = 0;
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cmph_uint32 hl[3];
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bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
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bdz_init_graph3(graph3, bdz->m, bdz->n);
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mph->key_source->rewind(mph->key_source->data);
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for (e = 0; e < mph->key_source->nkeys; ++e)
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{
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cmph_uint32 h0, h1, h2;
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cmph_uint32 keylen;
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char *key = NULL;
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mph->key_source->read(mph->key_source->data, &key, &keylen);
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hash_vector(bdz->hl, key, keylen,hl);
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h0 = hl[0] % bdz->r;
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h1 = hl[1] % bdz->r + bdz->r;
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h2 = hl[2] % bdz->r + (bdz->r << 1);
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DEBUGP("Key: %.*s (%u %u %u)\n", keylen, key, h0, h1, h2);
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mph->key_source->dispose(mph->key_source->data, key, keylen);
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bdz_add_edge(graph3,h0,h1,h2);
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}
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cycles = bdz_generate_queue(bdz->m, bdz->n, queue, graph3);
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return (cycles == 0);
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}
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static void assigning(bdz_config_data_t *bdz, bdz_graph3_t* graph3, bdz_queue_t queue)
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{
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cmph_uint32 i;
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cmph_uint32 nedges=graph3->nedges;
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cmph_uint32 curr_edge;
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cmph_uint32 v0,v1,v2;
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cmph_uint8 * marked_vertices = (cmph_uint8 *)malloc((size_t)(bdz->n >> 3) + 1);
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cmph_uint32 sizeg = (cmph_uint32)ceil(bdz->n/4.0);
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bdz->g = (cmph_uint8 *)calloc((size_t)(sizeg), sizeof(cmph_uint8));
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memset(marked_vertices, 0, (size_t)(bdz->n >> 3) + 1);
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memset(bdz->g, 0xff, (size_t)(sizeg));
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for(i=nedges-1;i+1>=1;i--){
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curr_edge=queue[i];
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v0=graph3->edges[curr_edge].vertices[0];
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v1=graph3->edges[curr_edge].vertices[1];
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v2=graph3->edges[curr_edge].vertices[2];
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DEBUGP("B:%u %u %u -- %u %u %u edge %u\n", v0, v1, v2, GETVALUE(bdz->g, v0), GETVALUE(bdz->g, v1), GETVALUE(bdz->g, v2), curr_edge);
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if(!GETBIT(marked_vertices, v0)){
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if(!GETBIT(marked_vertices,v1))
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{
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SETVALUE1(bdz->g, v1, UNASSIGNED);
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SETBIT(marked_vertices, v1);
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}
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if(!GETBIT(marked_vertices,v2))
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{
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SETVALUE1(bdz->g, v2, UNASSIGNED);
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SETBIT(marked_vertices, v2);
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}
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SETVALUE1(bdz->g, v0, (6-(GETVALUE(bdz->g, v1) + GETVALUE(bdz->g,v2)))%3);
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SETBIT(marked_vertices, v0);
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} else if(!GETBIT(marked_vertices, v1)) {
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if(!GETBIT(marked_vertices, v2))
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{
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SETVALUE1(bdz->g, v2, UNASSIGNED);
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SETBIT(marked_vertices, v2);
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}
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SETVALUE1(bdz->g, v1, (7-(GETVALUE(bdz->g, v0)+GETVALUE(bdz->g, v2)))%3);
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SETBIT(marked_vertices, v1);
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}else {
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SETVALUE1(bdz->g, v2, (8-(GETVALUE(bdz->g,v0)+GETVALUE(bdz->g, v1)))%3);
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SETBIT(marked_vertices, v2);
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}
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DEBUGP("A:%u %u %u -- %u %u %u\n", v0, v1, v2, GETVALUE(bdz->g, v0), GETVALUE(bdz->g, v1), GETVALUE(bdz->g, v2));
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};
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free(marked_vertices);
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}
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static void ranking(bdz_config_data_t *bdz)
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{
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cmph_uint32 i, j, offset = 0U, count = 0U, size = (bdz->k >> 2U), nbytes_total = (cmph_uint32)ceil(bdz->n/4.0), nbytes;
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bdz->ranktable = (cmph_uint32 *)calloc((size_t)bdz->ranktablesize, sizeof(cmph_uint32));
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// ranktable computation
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bdz->ranktable[0] = 0;
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i = 1;
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while(1)
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{
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if(i == bdz->ranktablesize) break;
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nbytes = size < nbytes_total? size : nbytes_total;
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for(j = 0; j < nbytes; j++)
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{
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count += bdz_lookup_table[*(bdz->g + offset + j)];
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}
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bdz->ranktable[i] = count;
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offset += nbytes;
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nbytes_total -= size;
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i++;
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}
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}
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int bdz_dump(cmph_t *mphf, FILE *fd)
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{
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char *buf = NULL;
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cmph_uint32 buflen;
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register size_t nbytes;
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bdz_data_t *data = (bdz_data_t *)mphf->data;
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__cmph_dump(mphf, fd);
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hash_state_dump(data->hl, &buf, &buflen);
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DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
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nbytes = fwrite(&buflen, sizeof(cmph_uint32), (size_t)1, fd);
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nbytes = fwrite(buf, (size_t)buflen, (size_t)1, fd);
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free(buf);
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nbytes = fwrite(&(data->n), sizeof(cmph_uint32), (size_t)1, fd);
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nbytes = fwrite(&(data->m), sizeof(cmph_uint32), (size_t)1, fd);
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nbytes = fwrite(&(data->r), sizeof(cmph_uint32), (size_t)1, fd);
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cmph_uint32 sizeg = (cmph_uint32)ceil(data->n/4.0);
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nbytes = fwrite(data->g, sizeof(cmph_uint8)*sizeg, (size_t)1, fd);
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nbytes = fwrite(&(data->k), sizeof(cmph_uint32), (size_t)1, fd);
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nbytes = fwrite(&(data->b), sizeof(cmph_uint8), (size_t)1, fd);
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nbytes = fwrite(&(data->ranktablesize), sizeof(cmph_uint32), (size_t)1, fd);
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nbytes = fwrite(data->ranktable, sizeof(cmph_uint32)*(data->ranktablesize), (size_t)1, fd);
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#ifdef DEBUG
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cmph_uint32 i;
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fprintf(stderr, "G: ");
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for (i = 0; i < data->n; ++i) fprintf(stderr, "%u ", GETVALUE(data->g, i));
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fprintf(stderr, "\n");
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#endif
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return 1;
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}
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void bdz_load(FILE *f, cmph_t *mphf)
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{
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char *buf = NULL;
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cmph_uint32 buflen, sizeg;
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register size_t nbytes;
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bdz_data_t *bdz = (bdz_data_t *)malloc(sizeof(bdz_data_t));
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DEBUGP("Loading bdz mphf\n");
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mphf->data = bdz;
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nbytes = fread(&buflen, sizeof(cmph_uint32), (size_t)1, f);
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DEBUGP("Hash state has %u bytes\n", buflen);
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buf = (char *)malloc((size_t)buflen);
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nbytes = fread(buf, (size_t)buflen, (size_t)1, f);
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bdz->hl = hash_state_load(buf, buflen);
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free(buf);
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DEBUGP("Reading m and n\n");
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nbytes = fread(&(bdz->n), sizeof(cmph_uint32), (size_t)1, f);
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nbytes = fread(&(bdz->m), sizeof(cmph_uint32), (size_t)1, f);
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nbytes = fread(&(bdz->r), sizeof(cmph_uint32), (size_t)1, f);
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sizeg = (cmph_uint32)ceil(bdz->n/4.0);
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bdz->g = (cmph_uint8 *)calloc((size_t)(sizeg), sizeof(cmph_uint8));
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nbytes = fread(bdz->g, sizeg*sizeof(cmph_uint8), (size_t)1, f);
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nbytes = fread(&(bdz->k), sizeof(cmph_uint32), (size_t)1, f);
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nbytes = fread(&(bdz->b), sizeof(cmph_uint8), (size_t)1, f);
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nbytes = fread(&(bdz->ranktablesize), sizeof(cmph_uint32), (size_t)1, f);
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bdz->ranktable = (cmph_uint32 *)calloc((size_t)bdz->ranktablesize, sizeof(cmph_uint32));
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nbytes = fread(bdz->ranktable, sizeof(cmph_uint32)*(bdz->ranktablesize), (size_t)1, f);
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#ifdef DEBUG
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cmph_uint32 i = 0;
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fprintf(stderr, "G: ");
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for (i = 0; i < bdz->n; ++i) fprintf(stderr, "%u ", GETVALUE(bdz->g,i));
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fprintf(stderr, "\n");
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#endif
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return;
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}
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static inline cmph_uint32 rank(cmph_uint32 b, cmph_uint32 * ranktable, cmph_uint8 * g, cmph_uint32 vertex)
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{
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register cmph_uint32 index = vertex >> b;
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register cmph_uint32 base_rank = ranktable[index];
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register cmph_uint32 beg_idx_v = index << b;
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register cmph_uint32 beg_idx_b = beg_idx_v >> 2;
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register cmph_uint32 end_idx_b = vertex >> 2;
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while(beg_idx_b < end_idx_b)
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{
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base_rank += bdz_lookup_table[*(g + beg_idx_b++)];
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}
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DEBUGP("base rank %u\n", base_rank);
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beg_idx_v = beg_idx_b << 2;
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DEBUGP("beg_idx_v %u\n", beg_idx_v);
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while(beg_idx_v < vertex)
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{
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if(GETVALUE(g, beg_idx_v) != UNASSIGNED) base_rank++;
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beg_idx_v++;
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}
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return base_rank;
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}
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cmph_uint32 bdz_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
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{
|
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register cmph_uint32 vertex;
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register bdz_data_t *bdz = (bdz_data_t *)mphf->data;
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cmph_uint32 hl[3];
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hash_vector(bdz->hl, key, keylen, hl);
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hl[0] = hl[0] % bdz->r;
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hl[1] = hl[1] % bdz->r + bdz->r;
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hl[2] = hl[2] % bdz->r + (bdz->r << 1);
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vertex = hl[(GETVALUE(bdz->g, hl[0]) + GETVALUE(bdz->g, hl[1]) + GETVALUE(bdz->g, hl[2])) % 3];
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DEBUGP("Search found vertex %u\n", vertex);
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return rank(bdz->b, bdz->ranktable, bdz->g, vertex);
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|
}
|
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|
|
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void bdz_destroy(cmph_t *mphf)
|
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{
|
|
bdz_data_t *data = (bdz_data_t *)mphf->data;
|
|
free(data->g);
|
|
hash_state_destroy(data->hl);
|
|
free(data->ranktable);
|
|
free(data);
|
|
free(mphf);
|
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}
|
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/** \fn void bdz_pack(cmph_t *mphf, void *packed_mphf);
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* \brief Support the ability to pack a perfect hash function into a preallocated contiguous memory space pointed by packed_mphf.
|
|
* \param mphf pointer to the resulting mphf
|
|
* \param packed_mphf pointer to the contiguous memory area used to store the resulting mphf. The size of packed_mphf must be at least cmph_packed_size()
|
|
*/
|
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void bdz_pack(cmph_t *mphf, void *packed_mphf)
|
|
{
|
|
bdz_data_t *data = (bdz_data_t *)mphf->data;
|
|
cmph_uint8 * ptr = (cmph_uint8 *)packed_mphf;
|
|
|
|
// packing hl type
|
|
CMPH_HASH hl_type = hash_get_type(data->hl);
|
|
*((cmph_uint32 *) ptr) = hl_type;
|
|
ptr += sizeof(cmph_uint32);
|
|
|
|
// packing hl
|
|
hash_state_pack(data->hl, ptr);
|
|
ptr += hash_state_packed_size(hl_type);
|
|
|
|
// packing r
|
|
*((cmph_uint32 *) ptr) = data->r;
|
|
ptr += sizeof(data->r);
|
|
|
|
// packing ranktablesize
|
|
*((cmph_uint32 *) ptr) = data->ranktablesize;
|
|
ptr += sizeof(data->ranktablesize);
|
|
|
|
// packing ranktable
|
|
memcpy(ptr, data->ranktable, sizeof(cmph_uint32)*(data->ranktablesize));
|
|
ptr += sizeof(cmph_uint32)*(data->ranktablesize);
|
|
|
|
// packing b
|
|
*ptr++ = data->b;
|
|
|
|
// packing g
|
|
cmph_uint32 sizeg = (cmph_uint32)ceil(data->n/4.0);
|
|
memcpy(ptr, data->g, sizeof(cmph_uint8)*sizeg);
|
|
}
|
|
|
|
/** \fn cmph_uint32 bdz_packed_size(cmph_t *mphf);
|
|
* \brief Return the amount of space needed to pack mphf.
|
|
* \param mphf pointer to a mphf
|
|
* \return the size of the packed function or zero for failures
|
|
*/
|
|
cmph_uint32 bdz_packed_size(cmph_t *mphf)
|
|
{
|
|
bdz_data_t *data = (bdz_data_t *)mphf->data;
|
|
|
|
CMPH_HASH hl_type = hash_get_type(data->hl);
|
|
|
|
return (cmph_uint32)(sizeof(CMPH_ALGO) + hash_state_packed_size(hl_type) + 3*sizeof(cmph_uint32) + sizeof(cmph_uint32)*(data->ranktablesize) + sizeof(cmph_uint8) + sizeof(cmph_uint8)* (cmph_uint32)(ceil(data->n/4.0)));
|
|
}
|
|
|
|
/** cmph_uint32 bdz_search(void *packed_mphf, const char *key, cmph_uint32 keylen);
|
|
* \brief Use the packed mphf to do a search.
|
|
* \param packed_mphf pointer to the packed mphf
|
|
* \param key key to be hashed
|
|
* \param keylen key legth in bytes
|
|
* \return The mphf value
|
|
*/
|
|
cmph_uint32 bdz_search_packed(void *packed_mphf, const char *key, cmph_uint32 keylen)
|
|
{
|
|
|
|
register cmph_uint32 vertex;
|
|
register CMPH_HASH hl_type = (CMPH_HASH)(*(cmph_uint32 *)packed_mphf);
|
|
register cmph_uint8 *hl_ptr = (cmph_uint8 *)(packed_mphf) + 4;
|
|
|
|
register cmph_uint32 *ranktable = (cmph_uint32*)(hl_ptr + hash_state_packed_size(hl_type));
|
|
|
|
register cmph_uint32 r = *ranktable++;
|
|
register cmph_uint32 ranktablesize = *ranktable++;
|
|
register cmph_uint8 * g = (cmph_uint8 *)(ranktable + ranktablesize);
|
|
register cmph_uint8 b = *g++;
|
|
|
|
cmph_uint32 hl[3];
|
|
hash_vector_packed(hl_ptr, hl_type, key, keylen, hl);
|
|
hl[0] = hl[0] % r;
|
|
hl[1] = hl[1] % r + r;
|
|
hl[2] = hl[2] % r + (r << 1);
|
|
vertex = hl[(GETVALUE(g, hl[0]) + GETVALUE(g, hl[1]) + GETVALUE(g, hl[2])) % 3];
|
|
return rank(b, ranktable, g, vertex);
|
|
}
|