summaryrefslogtreecommitdiff
path: root/girepository/cmph/bdz.c
blob: 81cd7151ce00428dd308f1f4cc4419984338b381 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
#include "bdz.h"
#include "cmph_structs.h"
#include "bdz_structs.h"
#include "hash.h"
#include "bitbool.h"

#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
//#define DEBUG
#include "debug.h"
#define UNASSIGNED 3U
#define NULL_EDGE 0xffffffff

//cmph_uint32 ngrafos = 0;
//cmph_uint32 ngrafos_aciclicos = 0;
// table used for looking up the number of assigned vertices  a 8-bit integer
const cmph_uint8 bdz_lookup_table[] =
{
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 1, 1, 1, 0
};	

typedef struct 
{
	cmph_uint32 vertices[3];
	cmph_uint32 next_edges[3];
}bdz_edge_t;

typedef cmph_uint32 * bdz_queue_t;

static void bdz_alloc_queue(bdz_queue_t * queuep, cmph_uint32 nedges)
{
	(*queuep)=malloc(nedges*sizeof(cmph_uint32));
};
static void bdz_free_queue(bdz_queue_t * queue)
{
	free(*queue);
};

typedef struct 
{
	cmph_uint32 nedges;
	bdz_edge_t * edges;
	cmph_uint32 * first_edge;
	cmph_uint8 * vert_degree;	
}bdz_graph3_t;


static void bdz_alloc_graph3(bdz_graph3_t * graph3, cmph_uint32 nedges, cmph_uint32 nvertices)
{
	graph3->edges=malloc(nedges*sizeof(bdz_edge_t));
	graph3->first_edge=malloc(nvertices*sizeof(cmph_uint32));
	graph3->vert_degree=malloc((size_t)nvertices);	
};
static void bdz_init_graph3(bdz_graph3_t * graph3, cmph_uint32 nedges, cmph_uint32 nvertices)
{
	memset(graph3->first_edge,0xff,nvertices*sizeof(cmph_uint32));
	memset(graph3->vert_degree,0,(size_t)nvertices);
	graph3->nedges=0;
};
static void bdz_free_graph3(bdz_graph3_t *graph3)
{
	free(graph3->edges);
	free(graph3->first_edge);
	free(graph3->vert_degree);
};

static void bdz_partial_free_graph3(bdz_graph3_t *graph3)
{
	free(graph3->first_edge);
	free(graph3->vert_degree);
	graph3->first_edge = NULL;
	graph3->vert_degree = NULL;
};

static void bdz_add_edge(bdz_graph3_t * graph3, cmph_uint32 v0, cmph_uint32 v1, cmph_uint32 v2)
{
	graph3->edges[graph3->nedges].vertices[0]=v0;
	graph3->edges[graph3->nedges].vertices[1]=v1;
	graph3->edges[graph3->nedges].vertices[2]=v2;
	graph3->edges[graph3->nedges].next_edges[0]=graph3->first_edge[v0];
	graph3->edges[graph3->nedges].next_edges[1]=graph3->first_edge[v1];
	graph3->edges[graph3->nedges].next_edges[2]=graph3->first_edge[v2];
	graph3->first_edge[v0]=graph3->first_edge[v1]=graph3->first_edge[v2]=graph3->nedges;
	graph3->vert_degree[v0]++;
	graph3->vert_degree[v1]++;
	graph3->vert_degree[v2]++;
	graph3->nedges++;
};

static void bdz_dump_graph(bdz_graph3_t* graph3, cmph_uint32 nedges, cmph_uint32 nvertices)
{
	cmph_uint32 i;
	for(i=0;i<nedges;i++){
		printf("\nedge %d %d %d %d ",i,graph3->edges[i].vertices[0],
			graph3->edges[i].vertices[1],graph3->edges[i].vertices[2]);
		printf(" nexts %d %d %d",graph3->edges[i].next_edges[0],
				graph3->edges[i].next_edges[1],graph3->edges[i].next_edges[2]);
	};
	
	for(i=0;i<nvertices;i++){
		printf("\nfirst for vertice %d %d ",i,graph3->first_edge[i]);
	
	};
};

static void bdz_remove_edge(bdz_graph3_t * graph3, cmph_uint32 curr_edge)
{
	cmph_uint32 i,j=0,vert,edge1,edge2;
	for(i=0;i<3;i++){
		vert=graph3->edges[curr_edge].vertices[i];
		edge1=graph3->first_edge[vert];
		edge2=NULL_EDGE;
		while(edge1!=curr_edge&&edge1!=NULL_EDGE){
			edge2=edge1;
			if(graph3->edges[edge1].vertices[0]==vert){
				j=0;
			} else if(graph3->edges[edge1].vertices[1]==vert){
				j=1;
			} else 
				j=2;
			edge1=graph3->edges[edge1].next_edges[j];
		};
		if(edge1==NULL_EDGE){
			printf("\nerror remove edge %d dump graph",curr_edge);
			bdz_dump_graph(graph3,graph3->nedges,graph3->nedges+graph3->nedges/4);
			exit(-1);
		};
		
		if(edge2!=NULL_EDGE){
			graph3->edges[edge2].next_edges[j] = 
				graph3->edges[edge1].next_edges[i];
		} else 
			graph3->first_edge[vert]=
				graph3->edges[edge1].next_edges[i];
		graph3->vert_degree[vert]--;
	};
	
};

static int bdz_generate_queue(cmph_uint32 nedges, cmph_uint32 nvertices, bdz_queue_t queue, bdz_graph3_t* graph3)
{
	cmph_uint32 i,v0,v1,v2;
	cmph_uint32 queue_head=0,queue_tail=0;
	cmph_uint32 curr_edge;
	cmph_uint32 tmp_edge;
	cmph_uint8 * marked_edge =malloc((size_t)(nedges >> 3) + 1);
	memset(marked_edge, 0, (size_t)(nedges >> 3) + 1);

	for(i=0;i<nedges;i++){
		v0=graph3->edges[i].vertices[0];
		v1=graph3->edges[i].vertices[1];
		v2=graph3->edges[i].vertices[2];
		if(graph3->vert_degree[v0]==1 || 
				graph3->vert_degree[v1]==1 ||
				graph3->vert_degree[v2]==1){
			if(!GETBIT(marked_edge,i)) {
				queue[queue_head++]=i;
				SETBIT(marked_edge,i);
			}
		};
	};
	while(queue_tail!=queue_head){
		curr_edge=queue[queue_tail++];
		bdz_remove_edge(graph3,curr_edge);
		v0=graph3->edges[curr_edge].vertices[0];
		v1=graph3->edges[curr_edge].vertices[1];
		v2=graph3->edges[curr_edge].vertices[2];
		if(graph3->vert_degree[v0]==1 ) {
			tmp_edge=graph3->first_edge[v0];
			if(!GETBIT(marked_edge,tmp_edge)) {
				queue[queue_head++]=tmp_edge;
				SETBIT(marked_edge,tmp_edge);
			};
			
		};
		if(graph3->vert_degree[v1]==1) {
			tmp_edge=graph3->first_edge[v1];
			if(!GETBIT(marked_edge,tmp_edge)){
				queue[queue_head++]=tmp_edge;
				SETBIT(marked_edge,tmp_edge);
			};
			
		};
		if(graph3->vert_degree[v2]==1){
			tmp_edge=graph3->first_edge[v2];
			if(!GETBIT(marked_edge,tmp_edge)){
				queue[queue_head++]=tmp_edge;
				SETBIT(marked_edge,tmp_edge);
			};
		};
	};
	free(marked_edge);
	return (int)(queue_head-nedges);/* returns 0 if successful otherwies return negative number*/
};

static int bdz_mapping(cmph_config_t *mph, bdz_graph3_t* graph3, bdz_queue_t queue);
static void assigning(bdz_config_data_t *bdz, bdz_graph3_t* graph3, bdz_queue_t queue);
static void ranking(bdz_config_data_t *bdz);
static cmph_uint32 rank(cmph_uint32 b, cmph_uint32 * ranktable, cmph_uint8 * g, cmph_uint32 vertex);

bdz_config_data_t *bdz_config_new(void)
{
	bdz_config_data_t *bdz;
	bdz = (bdz_config_data_t *)malloc(sizeof(bdz_config_data_t));
	assert(bdz);
	memset(bdz, 0, sizeof(bdz_config_data_t));
	bdz->hashfunc = CMPH_HASH_JENKINS;
	bdz->g = NULL;
	bdz->hl = NULL;
	bdz->k = 0; //kth index in ranktable, $k = log_2(n=3r)/\varepsilon$
	bdz->b = 7; // number of bits of k
	bdz->ranktablesize = 0; //number of entries in ranktable, $n/k +1$
	bdz->ranktable = NULL; // rank table
	return bdz;
}

void bdz_config_destroy(cmph_config_t *mph)
{
	bdz_config_data_t *data = (bdz_config_data_t *)mph->data;
	DEBUGP("Destroying algorithm dependent data\n");
	free(data);
}

void bdz_config_set_b(cmph_config_t *mph, cmph_uint32 b)
{
	bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
	if (b <= 2 || b > 10) b = 7; // validating restrictions over parameter b.
	bdz->b = (cmph_uint8)b;
	DEBUGP("b: %u\n", b);

}

void bdz_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs)
{
	bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
	CMPH_HASH *hashptr = hashfuncs;
	cmph_uint32 i = 0;
	while(*hashptr != CMPH_HASH_COUNT)
	{
		if (i >= 1) break; //bdz only uses one linear hash function
		bdz->hashfunc = *hashptr;	
		++i, ++hashptr;
	}
}

cmph_t *bdz_new(cmph_config_t *mph, double c)
{
	cmph_t *mphf = NULL;
	bdz_data_t *bdzf = NULL;
	cmph_uint32 iterations;
	bdz_queue_t edges;
	bdz_graph3_t graph3;
	bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
	#ifdef CMPH_TIMING
	double construction_time_begin = 0.0;
	double construction_time = 0.0;
	ELAPSED_TIME_IN_SECONDS(&construction_time_begin);
	#endif


	if (c == 0) c = 1.23; // validating restrictions over parameter c.
	DEBUGP("c: %f\n", c);
	bdz->m = mph->key_source->nkeys;	
	bdz->r = (cmph_uint32)ceil((c * mph->key_source->nkeys)/3);
	if ((bdz->r % 2) == 0) bdz->r+=1;
	bdz->n = 3*bdz->r;

	bdz->k = (1U << bdz->b);
	DEBUGP("b: %u -- k: %u\n", bdz->b, bdz->k);
	
	bdz->ranktablesize = (cmph_uint32)ceil(bdz->n/(double)bdz->k);
	DEBUGP("ranktablesize: %u\n", bdz->ranktablesize);

	
	bdz_alloc_graph3(&graph3, bdz->m, bdz->n);
	bdz_alloc_queue(&edges,bdz->m);
	DEBUGP("Created hypergraph\n");
	
	DEBUGP("m (edges): %u n (vertices): %u  r: %u c: %f \n", bdz->m, bdz->n, bdz->r, c);

	// Mapping step
	iterations = 1000;
	if (mph->verbosity)
	{
		fprintf(stderr, "Entering mapping step for mph creation of %u keys with graph sized %u\n", bdz->m, bdz->n);
	}
	while(1)
	{
		int ok;
		DEBUGP("linear hash function \n");
		bdz->hl = hash_state_new(bdz->hashfunc, 15);

		ok = bdz_mapping(mph, &graph3, edges);
                //ok = 0;
		if (!ok)
		{
			--iterations;
			hash_state_destroy(bdz->hl);
			bdz->hl = NULL;
			DEBUGP("%u iterations remaining\n", iterations);
			if (mph->verbosity)
			{
				fprintf(stderr, "acyclic graph creation failure - %u iterations remaining\n", iterations);
			}
			if (iterations == 0) break;
		} 
		else break;
	}
	
	if (iterations == 0)
	{
		bdz_free_queue(&edges);
		bdz_free_graph3(&graph3);
		return NULL;
	}
	bdz_partial_free_graph3(&graph3);
	// Assigning step
	if (mph->verbosity)
	{
		fprintf(stderr, "Entering assigning step for mph creation of %u keys with graph sized %u\n", bdz->m, bdz->n);
	}
	assigning(bdz, &graph3, edges);

	bdz_free_queue(&edges);
	bdz_free_graph3(&graph3);
	if (mph->verbosity)
	{
		fprintf(stderr, "Entering ranking step for mph creation of %u keys with graph sized %u\n", bdz->m, bdz->n);
	}
	ranking(bdz);
	#ifdef CMPH_TIMING	
	ELAPSED_TIME_IN_SECONDS(&construction_time);
	#endif
	mphf = (cmph_t *)malloc(sizeof(cmph_t));
	mphf->algo = mph->algo;
	bdzf = (bdz_data_t *)malloc(sizeof(bdz_data_t));
	bdzf->g = bdz->g;
	bdz->g = NULL; //transfer memory ownership
	bdzf->hl = bdz->hl;
	bdz->hl = NULL; //transfer memory ownership
	bdzf->ranktable = bdz->ranktable;
	bdz->ranktable = NULL; //transfer memory ownership
	bdzf->ranktablesize = bdz->ranktablesize;
	bdzf->k = bdz->k;
	bdzf->b = bdz->b;
	bdzf->n = bdz->n;
	bdzf->m = bdz->m;
	bdzf->r = bdz->r;
	mphf->data = bdzf;
	mphf->size = bdz->m;

	DEBUGP("Successfully generated minimal perfect hash\n");
	if (mph->verbosity)
	{
		fprintf(stderr, "Successfully generated minimal perfect hash function\n");
	}


	#ifdef CMPH_TIMING	
	register cmph_uint32 space_usage = bdz_packed_size(mphf)*8;
	register cmph_uint32 keys_per_bucket = 1;
	construction_time = construction_time - construction_time_begin;
	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);
	#endif	

	return mphf;
}

		
static int bdz_mapping(cmph_config_t *mph, bdz_graph3_t* graph3, bdz_queue_t queue)
{
	cmph_uint32 e;
	int cycles = 0;
	cmph_uint32 hl[3];
	bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
	bdz_init_graph3(graph3, bdz->m, bdz->n);
	mph->key_source->rewind(mph->key_source->data);
	for (e = 0; e < mph->key_source->nkeys; ++e)
	{
		cmph_uint32 h0, h1, h2;
		cmph_uint32 keylen;
		char *key = NULL;
		mph->key_source->read(mph->key_source->data, &key, &keylen);		
		hash_vector(bdz->hl, key, keylen,hl);
		h0 = hl[0] % bdz->r;
		h1 = hl[1] % bdz->r + bdz->r;
		h2 = hl[2] % bdz->r + (bdz->r << 1);
		mph->key_source->dispose(mph->key_source->data, key, keylen);
		bdz_add_edge(graph3,h0,h1,h2);
	}
	cycles = bdz_generate_queue(bdz->m, bdz->n, queue, graph3);	
	return (cycles == 0);
}

static void assigning(bdz_config_data_t *bdz, bdz_graph3_t* graph3, bdz_queue_t queue)
{
	cmph_uint32 i;
	cmph_uint32 nedges=graph3->nedges;
	cmph_uint32 curr_edge;
	cmph_uint32 v0,v1,v2;
	cmph_uint8 * marked_vertices =malloc((size_t)(bdz->n >> 3) + 1);
        cmph_uint32 sizeg = (cmph_uint32)ceil(bdz->n/4.0);
	bdz->g = (cmph_uint8 *)calloc((size_t)(sizeg), sizeof(cmph_uint8));	
	memset(marked_vertices, 0, (size_t)(bdz->n >> 3) + 1);
	memset(bdz->g, 0xff, (size_t)(sizeg));

	for(i=nedges-1;i+1>=1;i--){
		curr_edge=queue[i];
		v0=graph3->edges[curr_edge].vertices[0];
		v1=graph3->edges[curr_edge].vertices[1];
		v2=graph3->edges[curr_edge].vertices[2];
		DEBUGP("B:%u %u %u -- %u %u %u\n", v0, v1, v2, GETVALUE(bdz->g, v0), GETVALUE(bdz->g, v1), GETVALUE(bdz->g, v2));
		if(!GETBIT(marked_vertices, v0)){
			if(!GETBIT(marked_vertices,v1))
			{
				SETVALUE1(bdz->g, v1, UNASSIGNED); 
				SETBIT(marked_vertices, v1);
			}
			if(!GETBIT(marked_vertices,v2))
			{
				SETVALUE1(bdz->g, v2, UNASSIGNED);		
				SETBIT(marked_vertices, v2);
			}
			SETVALUE1(bdz->g, v0, (6-(GETVALUE(bdz->g, v1) + GETVALUE(bdz->g,v2)))%3);
			SETBIT(marked_vertices, v0);
		} else if(!GETBIT(marked_vertices, v1)) {
			if(!GETBIT(marked_vertices, v2))
			{
				SETVALUE1(bdz->g, v2, UNASSIGNED);
				SETBIT(marked_vertices, v2);
			}
			SETVALUE1(bdz->g, v1, (7-(GETVALUE(bdz->g, v0)+GETVALUE(bdz->g, v2)))%3);
			SETBIT(marked_vertices, v1);
		}else {
			SETVALUE1(bdz->g, v2, (8-(GETVALUE(bdz->g,v0)+GETVALUE(bdz->g, v1)))%3);
			SETBIT(marked_vertices, v2);
		}		
		DEBUGP("A:%u %u %u -- %u %u %u\n", v0, v1, v2, GETVALUE(bdz->g, v0), GETVALUE(bdz->g, v1), GETVALUE(bdz->g, v2));
	};
	free(marked_vertices);
}


static void ranking(bdz_config_data_t *bdz)
{
	cmph_uint32 i, j, offset = 0U, count = 0U, size = (bdz->k >> 2U), nbytes_total = (cmph_uint32)ceil(bdz->n/4.0), nbytes;
	bdz->ranktable = (cmph_uint32 *)calloc((size_t)bdz->ranktablesize, sizeof(cmph_uint32));
	// ranktable computation
	bdz->ranktable[0] = 0;	
	i = 1;
	while(1)
	{
		if(i == bdz->ranktablesize) break;
		nbytes = size < nbytes_total? size : nbytes_total;
		for(j = 0; j < nbytes; j++)
		{
			count += bdz_lookup_table[*(bdz->g + offset + j)];
		}
		bdz->ranktable[i] = count;
		offset += nbytes;
		nbytes_total -= size;
		i++;
	}
}


int bdz_dump(cmph_t *mphf, FILE *fd)
{
	char *buf = NULL;
	cmph_uint32 buflen;
	register size_t nbytes;
	bdz_data_t *data = (bdz_data_t *)mphf->data;
	cmph_uint32 sizeg;
#ifdef DEBUG
	cmph_uint32 i;
#endif
	__cmph_dump(mphf, fd);

	hash_state_dump(data->hl, &buf, &buflen);
	DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
	nbytes = fwrite(&buflen, sizeof(cmph_uint32), (size_t)1, fd);
	nbytes = fwrite(buf, (size_t)buflen, (size_t)1, fd);
	free(buf);

	nbytes = fwrite(&(data->n), sizeof(cmph_uint32), (size_t)1, fd);
	nbytes = fwrite(&(data->m), sizeof(cmph_uint32), (size_t)1, fd);
	nbytes = fwrite(&(data->r), sizeof(cmph_uint32), (size_t)1, fd);
	
	sizeg = (cmph_uint32)ceil(data->n/4.0);
	nbytes = fwrite(data->g, sizeof(cmph_uint8)*sizeg, (size_t)1, fd);

	nbytes = fwrite(&(data->k), sizeof(cmph_uint32), (size_t)1, fd);
	nbytes = fwrite(&(data->b), sizeof(cmph_uint8), (size_t)1, fd);
	nbytes = fwrite(&(data->ranktablesize), sizeof(cmph_uint32), (size_t)1, fd);

	nbytes = fwrite(data->ranktable, sizeof(cmph_uint32)*(data->ranktablesize), (size_t)1, fd);
	if (nbytes == 0 && ferror(fd)) {
          fprintf(stderr, "ERROR: %s\n", strerror(errno));
          return 0;
        }
	#ifdef DEBUG
	fprintf(stderr, "G: ");
	for (i = 0; i < data->n; ++i) fprintf(stderr, "%u ", GETVALUE(data->g, i));
	fprintf(stderr, "\n");
	#endif
	return 1;
}

void bdz_load(FILE *f, cmph_t *mphf)
{
	char *buf = NULL;
	cmph_uint32 buflen, sizeg;
	register size_t nbytes;
	bdz_data_t *bdz = (bdz_data_t *)malloc(sizeof(bdz_data_t));
#ifdef DEBUG
	cmph_uint32  i = 0;
#endif

	DEBUGP("Loading bdz mphf\n");
	mphf->data = bdz;

	nbytes = fread(&buflen, sizeof(cmph_uint32), (size_t)1, f);
	DEBUGP("Hash state has %u bytes\n", buflen);
	buf = (char *)malloc((size_t)buflen);
	nbytes = fread(buf, (size_t)buflen, (size_t)1, f);
	bdz->hl = hash_state_load(buf, buflen);
	free(buf);
	

	DEBUGP("Reading m and n\n");
	nbytes = fread(&(bdz->n), sizeof(cmph_uint32), (size_t)1, f);	
	nbytes = fread(&(bdz->m), sizeof(cmph_uint32), (size_t)1, f);	
	nbytes = fread(&(bdz->r), sizeof(cmph_uint32), (size_t)1, f);	
	sizeg = (cmph_uint32)ceil(bdz->n/4.0);
	bdz->g = (cmph_uint8 *)calloc((size_t)(sizeg), sizeof(cmph_uint8));
	nbytes = fread(bdz->g, sizeg*sizeof(cmph_uint8), (size_t)1, f);

	nbytes = fread(&(bdz->k), sizeof(cmph_uint32), (size_t)1, f);
	nbytes = fread(&(bdz->b), sizeof(cmph_uint8), (size_t)1, f);
	nbytes = fread(&(bdz->ranktablesize), sizeof(cmph_uint32), (size_t)1, f);

	bdz->ranktable = (cmph_uint32 *)calloc((size_t)bdz->ranktablesize, sizeof(cmph_uint32));
	nbytes = fread(bdz->ranktable, sizeof(cmph_uint32)*(bdz->ranktablesize), (size_t)1, f);
	if (nbytes == 0 && ferror(f)) {
          fprintf(stderr, "ERROR: %s\n", strerror(errno));
          return;
        }

	#ifdef DEBUG
	i = 0;
	fprintf(stderr, "G: ");
	for (i = 0; i < bdz->n; ++i) fprintf(stderr, "%u ", GETVALUE(bdz->g,i));
	fprintf(stderr, "\n");
	#endif
	return;
}
		

/*
static cmph_uint32 bdz_search_ph(cmph_t *mphf, const char *key, cmph_uint32 keylen)
{
	bdz_data_t *bdz = mphf->data;
	cmph_uint32 hl[3];
	hash_vector(bdz->hl, key, keylen, hl);
	cmph_uint32 vertex;
	hl[0] = hl[0] % bdz->r;
	hl[1] = hl[1] % bdz->r + bdz->r;
	hl[2] = hl[2] % bdz->r + (bdz->r << 1);
	vertex = hl[(GETVALUE(bdz->g, hl[0]) + GETVALUE(bdz->g, hl[1]) + GETVALUE(bdz->g, hl[2])) % 3];
	return vertex;
}
*/

static inline cmph_uint32 rank(cmph_uint32 b, cmph_uint32 * ranktable, cmph_uint8 * g, cmph_uint32 vertex)
{
	register cmph_uint32 index = vertex >> b;
	register cmph_uint32 base_rank = ranktable[index];
	register cmph_uint32 beg_idx_v = index << b;
	register cmph_uint32 beg_idx_b = beg_idx_v >> 2;
	register cmph_uint32 end_idx_b = vertex >> 2;
	while(beg_idx_b < end_idx_b)
	{
		base_rank += bdz_lookup_table[*(g + beg_idx_b++)];
		
	}
	beg_idx_v = beg_idx_b << 2;
	while(beg_idx_v < vertex) 
	{
		if(GETVALUE(g, beg_idx_v) != UNASSIGNED) base_rank++;
		beg_idx_v++;
	}
	
	return base_rank;
}

cmph_uint32 bdz_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
{
	register cmph_uint32 vertex;
	register bdz_data_t *bdz = mphf->data;
	cmph_uint32 hl[3];
	hash_vector(bdz->hl, key, keylen, hl);
	hl[0] = hl[0] % bdz->r;
	hl[1] = hl[1] % bdz->r + bdz->r;
	hl[2] = hl[2] % bdz->r + (bdz->r << 1);
	vertex = hl[(GETVALUE(bdz->g, hl[0]) + GETVALUE(bdz->g, hl[1]) + GETVALUE(bdz->g, hl[2])) % 3];
	return rank(bdz->b, bdz->ranktable, bdz->g, vertex);
}


void bdz_destroy(cmph_t *mphf)
{
	bdz_data_t *data = (bdz_data_t *)mphf->data;
	free(data->g);	
	hash_state_destroy(data->hl);
	free(data->ranktable);
	free(data);
	free(mphf);
}

/** \fn void bdz_pack(cmph_t *mphf, void *packed_mphf);
 *  \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() 
 */
void bdz_pack(cmph_t *mphf, void *packed_mphf)
{
	bdz_data_t *data = (bdz_data_t *)mphf->data;
	cmph_uint8 * ptr = packed_mphf;
	cmph_uint32 sizeg;

	// 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
	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_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);
}