summaryrefslogtreecommitdiff
path: root/girepository/cmph/chd.c
blob: 7fb3b8bb83c39d3833046f391ee4e1e8beb8d615 (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
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
#include<time.h>
#include<assert.h>
#include<limits.h>

#include "cmph_structs.h"
#include "chd_structs.h"
#include "chd.h"
#include "bitbool.h"
//#define DEBUG
#include "debug.h"

chd_config_data_t *chd_config_new(cmph_config_t *mph)
{
	cmph_io_adapter_t *key_source = mph->key_source;
	chd_config_data_t *chd;
	chd = (chd_config_data_t *)malloc(sizeof(chd_config_data_t));
	assert(chd);
	memset(chd, 0, sizeof(chd_config_data_t));

	chd->chd_ph = cmph_config_new(key_source);
	cmph_config_set_algo(chd->chd_ph, CMPH_CHD_PH);

	return chd;
}

void chd_config_destroy(cmph_config_t *mph)
{
	chd_config_data_t *data = (chd_config_data_t *) mph->data;
	DEBUGP("Destroying algorithm dependent data\n");
	if(data->chd_ph)
	{
		cmph_config_destroy(data->chd_ph);
		data->chd_ph = NULL;
	}
	free(data);
}


void chd_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs)
{
	chd_config_data_t *data = (chd_config_data_t *) mph->data;
	cmph_config_set_hashfuncs(data->chd_ph, hashfuncs);
}


void chd_config_set_b(cmph_config_t *mph, cmph_uint32 keys_per_bucket)
{
	chd_config_data_t *data = (chd_config_data_t *) mph->data;
	cmph_config_set_b(data->chd_ph, keys_per_bucket);
}


void chd_config_set_keys_per_bin(cmph_config_t *mph, cmph_uint32 keys_per_bin)
{
	chd_config_data_t *data = (chd_config_data_t *) mph->data;
	cmph_config_set_keys_per_bin(data->chd_ph, keys_per_bin);
}


cmph_t *chd_new(cmph_config_t *mph, double c)
{
	cmph_t *mphf = NULL;
	chd_data_t *chdf = NULL;
	chd_config_data_t *chd = (chd_config_data_t *)mph->data;
	chd_ph_config_data_t * chd_ph = (chd_ph_config_data_t *)chd->chd_ph->data;
	compressed_rank_t cr;
	
	register cmph_t * chd_phf = NULL;
	register cmph_uint32 packed_chd_phf_size = 0; 
	cmph_uint8 * packed_chd_phf = NULL;
	
	register cmph_uint32 packed_cr_size = 0; 
	cmph_uint8 * packed_cr = NULL;

	register cmph_uint32 i, idx, nkeys, nvals, nbins;
	cmph_uint32 * vals_table = NULL;
	register cmph_uint32 * occup_table = NULL;
	#ifdef CMPH_TIMING
	double construction_time_begin = 0.0;
	double construction_time = 0.0;
	ELAPSED_TIME_IN_SECONDS(&construction_time_begin);
	#endif

	cmph_config_set_verbosity(chd->chd_ph, mph->verbosity);	
	cmph_config_set_graphsize(chd->chd_ph, c);
	
	if (mph->verbosity)
	{
		fprintf(stderr, "Generating a CHD_PH perfect hash function with a load factor equal to %.3f\n", c);
	}
	
	chd_phf = cmph_new(chd->chd_ph);
	
	if(chd_phf == NULL) 
	{
		return NULL;
	}
	
	packed_chd_phf_size = cmph_packed_size(chd_phf); 
	DEBUGP("packed_chd_phf_size = %u\n", packed_chd_phf_size);
	
	/* Make sure that we have enough space to pack the mphf. */
	packed_chd_phf = calloc((size_t)packed_chd_phf_size,(size_t)1);

	/* Pack the mphf. */
	cmph_pack(chd_phf, packed_chd_phf);

	cmph_destroy(chd_phf);
	
	
	if (mph->verbosity)
	{
		fprintf(stderr, "Compressing the range of the resulting CHD_PH perfect hash function\n");
	}

	compressed_rank_init(&cr);
	nbins = chd_ph->n;
	nkeys = chd_ph->m;
	nvals =  nbins - nkeys; 
	
	vals_table = (cmph_uint32 *)calloc(nvals, sizeof(cmph_uint32));
	occup_table = (cmph_uint32 *)chd_ph->occup_table;
	
	for(i = 0, idx = 0; i < nbins; i++)
	{
		if(!GETBIT32(occup_table, i))
		{
			vals_table[idx++] = i;
		}
	}
	
	compressed_rank_generate(&cr, vals_table, nvals);
	free(vals_table);
	
	packed_cr_size = compressed_rank_packed_size(&cr);
	packed_cr = (cmph_uint8 *) calloc(packed_cr_size, sizeof(cmph_uint8));
	compressed_rank_pack(&cr, packed_cr);
	compressed_rank_destroy(&cr);

	mphf = (cmph_t *)malloc(sizeof(cmph_t));
	mphf->algo = mph->algo;
	chdf = (chd_data_t *)malloc(sizeof(chd_data_t));
	
	chdf->packed_cr = packed_cr;
	packed_cr = NULL; //transfer memory ownership

	chdf->packed_chd_phf = packed_chd_phf;
	packed_chd_phf = NULL; //transfer memory ownership
	
	chdf->packed_chd_phf_size = packed_chd_phf_size;
	chdf->packed_cr_size = packed_cr_size;
	
	mphf->data = chdf;
	mphf->size = nkeys;

	DEBUGP("Successfully generated minimal perfect hash\n");
	if (mph->verbosity)
	{
		fprintf(stderr, "Successfully generated minimal perfect hash function\n");
	}
	#ifdef CMPH_TIMING	
	ELAPSED_TIME_IN_SECONDS(&construction_time);
	register cmph_uint32 space_usage =  chd_packed_size(mphf)*8;
	construction_time = construction_time - construction_time_begin;
	fprintf(stdout, "%u\t%.2f\t%u\t%.4f\t%.4f\n", nkeys, c, chd_ph->keys_per_bucket, construction_time, space_usage/(double)nkeys);
	#endif	

	return mphf;
}

void chd_load(FILE *fd, cmph_t *mphf)
{
	register size_t nbytes;
	chd_data_t *chd = (chd_data_t *)malloc(sizeof(chd_data_t));

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

	nbytes = fread(&chd->packed_chd_phf_size, sizeof(cmph_uint32), (size_t)1, fd);
	DEBUGP("Loading CHD_PH perfect hash function with %u bytes to disk\n", chd->packed_chd_phf_size);
	chd->packed_chd_phf = (cmph_uint8 *) calloc((size_t)chd->packed_chd_phf_size,(size_t)1);
	nbytes = fread(chd->packed_chd_phf, chd->packed_chd_phf_size, (size_t)1, fd);

	nbytes = fread(&chd->packed_cr_size, sizeof(cmph_uint32), (size_t)1, fd);
	DEBUGP("Loading Compressed rank structure, which has %u bytes\n", chd->packed_cr_size);
	chd->packed_cr = (cmph_uint8 *) calloc((size_t)chd->packed_cr_size, (size_t)1);
	nbytes = fread(chd->packed_cr, chd->packed_cr_size, (size_t)1, fd);
}

int chd_dump(cmph_t *mphf, FILE *fd)
{
	register size_t nbytes;
	chd_data_t *data = (chd_data_t *)mphf->data;
	
	__cmph_dump(mphf, fd);
	// Dumping CHD_PH perfect hash function

	DEBUGP("Dumping CHD_PH perfect hash function with %u bytes to disk\n", data->packed_chd_phf_size);
	nbytes = fwrite(&data->packed_chd_phf_size, sizeof(cmph_uint32), (size_t)1, fd);
	nbytes = fwrite(data->packed_chd_phf, data->packed_chd_phf_size, (size_t)1, fd);

	DEBUGP("Dumping compressed rank structure with %u bytes to disk\n", buflen);
	nbytes = fwrite(&data->packed_cr_size, sizeof(cmph_uint32), (size_t)1, fd);
	nbytes = fwrite(data->packed_cr, data->packed_cr_size, (size_t)1, fd);
	
	return 1;
}

void chd_destroy(cmph_t *mphf)
{
	chd_data_t *data = (chd_data_t *)mphf->data;
	free(data->packed_chd_phf);
	free(data->packed_cr);
	free(data);
	free(mphf);
}

static inline cmph_uint32 _chd_search(void * packed_chd_phf, void * packed_cr, const char *key, cmph_uint32 keylen)
{
	register cmph_uint32 bin_idx = cmph_search_packed(packed_chd_phf, key, keylen);
	register cmph_uint32 rank = compressed_rank_query_packed(packed_cr, bin_idx);
	return bin_idx - rank;
}

cmph_uint32 chd_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
{
	register chd_data_t * chd = mphf->data;
	return _chd_search(chd->packed_chd_phf, chd->packed_cr, key, keylen);
}

void chd_pack(cmph_t *mphf, void *packed_mphf)
{
	chd_data_t *data = (chd_data_t *)mphf->data;
	cmph_uint32 * ptr = packed_mphf;
	cmph_uint8 * ptr8;

	// packing packed_cr_size and packed_cr
	*ptr = data->packed_cr_size;
	ptr8 =  (cmph_uint8 *) (ptr + 1);
	
	memcpy(ptr8, data->packed_cr, data->packed_cr_size);
	ptr8 += data->packed_cr_size;
	
	ptr = (cmph_uint32 *) ptr8;
	*ptr = data->packed_chd_phf_size;

	ptr8 =  (cmph_uint8 *) (ptr + 1);
	memcpy(ptr8, data->packed_chd_phf, data->packed_chd_phf_size);
}

cmph_uint32 chd_packed_size(cmph_t *mphf)
{
	register chd_data_t *data = (chd_data_t *)mphf->data;
	return (cmph_uint32)(sizeof(CMPH_ALGO) + 2*sizeof(cmph_uint32) + data->packed_cr_size + data->packed_chd_phf_size);

}

cmph_uint32 chd_search_packed(void *packed_mphf, const char *key, cmph_uint32 keylen)
{

	register cmph_uint32 * ptr = packed_mphf;
	register cmph_uint32 packed_cr_size = *ptr++;
	register cmph_uint8 * packed_chd_phf = ((cmph_uint8 *) ptr) + packed_cr_size + sizeof(cmph_uint32);
	return _chd_search(packed_chd_phf, ptr, key, keylen);
}