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e1273106 VM |
1 | /** |
2 | * Copyright 2013, GitHub, Inc | |
3 | * Copyright 2009-2013, Daniel Lemire, Cliff Moon, | |
4 | * David McIntosh, Robert Becho, Google Inc. and Veronika Zenz | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
19 | */ | |
20 | #include "git-compat-util.h" | |
21 | #include "ewok.h" | |
22 | ||
34b935c0 JK |
23 | #define EWAH_MASK(x) ((eword_t)1 << (x % BITS_IN_EWORD)) |
24 | #define EWAH_BLOCK(x) (x / BITS_IN_EWORD) | |
e1273106 VM |
25 | |
26 | struct bitmap *bitmap_new(void) | |
27 | { | |
28 | struct bitmap *bitmap = ewah_malloc(sizeof(struct bitmap)); | |
29 | bitmap->words = ewah_calloc(32, sizeof(eword_t)); | |
30 | bitmap->word_alloc = 32; | |
31 | return bitmap; | |
32 | } | |
33 | ||
34 | void bitmap_set(struct bitmap *self, size_t pos) | |
35 | { | |
414382fb | 36 | size_t block = EWAH_BLOCK(pos); |
e1273106 VM |
37 | |
38 | if (block >= self->word_alloc) { | |
39 | size_t old_size = self->word_alloc; | |
40 | self->word_alloc = block * 2; | |
41 | self->words = ewah_realloc(self->words, | |
42 | self->word_alloc * sizeof(eword_t)); | |
43 | ||
44 | memset(self->words + old_size, 0x0, | |
45 | (self->word_alloc - old_size) * sizeof(eword_t)); | |
46 | } | |
47 | ||
414382fb | 48 | self->words[block] |= EWAH_MASK(pos); |
e1273106 VM |
49 | } |
50 | ||
51 | void bitmap_clear(struct bitmap *self, size_t pos) | |
52 | { | |
414382fb | 53 | size_t block = EWAH_BLOCK(pos); |
e1273106 VM |
54 | |
55 | if (block < self->word_alloc) | |
414382fb | 56 | self->words[block] &= ~EWAH_MASK(pos); |
e1273106 VM |
57 | } |
58 | ||
59 | int bitmap_get(struct bitmap *self, size_t pos) | |
60 | { | |
414382fb | 61 | size_t block = EWAH_BLOCK(pos); |
e1273106 | 62 | return block < self->word_alloc && |
414382fb | 63 | (self->words[block] & EWAH_MASK(pos)) != 0; |
e1273106 VM |
64 | } |
65 | ||
66 | struct ewah_bitmap *bitmap_to_ewah(struct bitmap *bitmap) | |
67 | { | |
68 | struct ewah_bitmap *ewah = ewah_new(); | |
69 | size_t i, running_empty_words = 0; | |
70 | eword_t last_word = 0; | |
71 | ||
72 | for (i = 0; i < bitmap->word_alloc; ++i) { | |
73 | if (bitmap->words[i] == 0) { | |
74 | running_empty_words++; | |
75 | continue; | |
76 | } | |
77 | ||
78 | if (last_word != 0) | |
79 | ewah_add(ewah, last_word); | |
80 | ||
81 | if (running_empty_words > 0) { | |
82 | ewah_add_empty_words(ewah, 0, running_empty_words); | |
83 | running_empty_words = 0; | |
84 | } | |
85 | ||
86 | last_word = bitmap->words[i]; | |
87 | } | |
88 | ||
89 | ewah_add(ewah, last_word); | |
90 | return ewah; | |
91 | } | |
92 | ||
93 | struct bitmap *ewah_to_bitmap(struct ewah_bitmap *ewah) | |
94 | { | |
95 | struct bitmap *bitmap = bitmap_new(); | |
96 | struct ewah_iterator it; | |
97 | eword_t blowup; | |
98 | size_t i = 0; | |
99 | ||
100 | ewah_iterator_init(&it, ewah); | |
101 | ||
102 | while (ewah_iterator_next(&blowup, &it)) { | |
103 | if (i >= bitmap->word_alloc) { | |
104 | bitmap->word_alloc *= 1.5; | |
105 | bitmap->words = ewah_realloc( | |
106 | bitmap->words, bitmap->word_alloc * sizeof(eword_t)); | |
107 | } | |
108 | ||
109 | bitmap->words[i++] = blowup; | |
110 | } | |
111 | ||
112 | bitmap->word_alloc = i; | |
113 | return bitmap; | |
114 | } | |
115 | ||
116 | void bitmap_and_not(struct bitmap *self, struct bitmap *other) | |
117 | { | |
118 | const size_t count = (self->word_alloc < other->word_alloc) ? | |
119 | self->word_alloc : other->word_alloc; | |
120 | ||
121 | size_t i; | |
122 | ||
123 | for (i = 0; i < count; ++i) | |
124 | self->words[i] &= ~other->words[i]; | |
125 | } | |
126 | ||
127 | void bitmap_or_ewah(struct bitmap *self, struct ewah_bitmap *other) | |
128 | { | |
129 | size_t original_size = self->word_alloc; | |
34b935c0 | 130 | size_t other_final = (other->bit_size / BITS_IN_EWORD) + 1; |
e1273106 VM |
131 | size_t i = 0; |
132 | struct ewah_iterator it; | |
133 | eword_t word; | |
134 | ||
135 | if (self->word_alloc < other_final) { | |
136 | self->word_alloc = other_final; | |
137 | self->words = ewah_realloc(self->words, | |
138 | self->word_alloc * sizeof(eword_t)); | |
139 | memset(self->words + original_size, 0x0, | |
140 | (self->word_alloc - original_size) * sizeof(eword_t)); | |
141 | } | |
142 | ||
143 | ewah_iterator_init(&it, other); | |
144 | ||
145 | while (ewah_iterator_next(&word, &it)) | |
146 | self->words[i++] |= word; | |
147 | } | |
148 | ||
149 | void bitmap_each_bit(struct bitmap *self, ewah_callback callback, void *data) | |
150 | { | |
151 | size_t pos = 0, i; | |
152 | ||
153 | for (i = 0; i < self->word_alloc; ++i) { | |
154 | eword_t word = self->words[i]; | |
155 | uint32_t offset; | |
156 | ||
157 | if (word == (eword_t)~0) { | |
34b935c0 | 158 | for (offset = 0; offset < BITS_IN_EWORD; ++offset) |
e1273106 VM |
159 | callback(pos++, data); |
160 | } else { | |
34b935c0 | 161 | for (offset = 0; offset < BITS_IN_EWORD; ++offset) { |
e1273106 VM |
162 | if ((word >> offset) == 0) |
163 | break; | |
164 | ||
165 | offset += ewah_bit_ctz64(word >> offset); | |
166 | callback(pos + offset, data); | |
167 | } | |
34b935c0 | 168 | pos += BITS_IN_EWORD; |
e1273106 VM |
169 | } |
170 | } | |
171 | } | |
172 | ||
173 | size_t bitmap_popcount(struct bitmap *self) | |
174 | { | |
175 | size_t i, count = 0; | |
176 | ||
177 | for (i = 0; i < self->word_alloc; ++i) | |
178 | count += ewah_bit_popcount64(self->words[i]); | |
179 | ||
180 | return count; | |
181 | } | |
182 | ||
183 | int bitmap_equals(struct bitmap *self, struct bitmap *other) | |
184 | { | |
185 | struct bitmap *big, *small; | |
186 | size_t i; | |
187 | ||
188 | if (self->word_alloc < other->word_alloc) { | |
189 | small = self; | |
190 | big = other; | |
191 | } else { | |
192 | small = other; | |
193 | big = self; | |
194 | } | |
195 | ||
196 | for (i = 0; i < small->word_alloc; ++i) { | |
197 | if (small->words[i] != big->words[i]) | |
198 | return 0; | |
199 | } | |
200 | ||
201 | for (; i < big->word_alloc; ++i) { | |
202 | if (big->words[i] != 0) | |
203 | return 0; | |
204 | } | |
205 | ||
206 | return 1; | |
207 | } | |
208 | ||
209 | void bitmap_reset(struct bitmap *bitmap) | |
210 | { | |
211 | memset(bitmap->words, 0x0, bitmap->word_alloc * sizeof(eword_t)); | |
212 | } | |
213 | ||
214 | void bitmap_free(struct bitmap *bitmap) | |
215 | { | |
216 | if (bitmap == NULL) | |
217 | return; | |
218 | ||
219 | free(bitmap->words); | |
220 | free(bitmap); | |
221 | } |