1 54be8251 2018-06-04 stsp /*
  2 54be8251 2018-06-04 stsp  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
  3 54be8251 2018-06-04 stsp  *
  4 54be8251 2018-06-04 stsp  * Permission to use, copy, modify, and distribute this software for any
  5 54be8251 2018-06-04 stsp  * purpose with or without fee is hereby granted, provided that the above
  6 54be8251 2018-06-04 stsp  * copyright notice and this permission notice appear in all copies.
  7 54be8251 2018-06-04 stsp  *
  8 54be8251 2018-06-04 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 54be8251 2018-06-04 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 54be8251 2018-06-04 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 54be8251 2018-06-04 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 54be8251 2018-06-04 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 54be8251 2018-06-04 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 54be8251 2018-06-04 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 54be8251 2018-06-04 stsp  */
 16 54be8251 2018-06-04 stsp 
 17 54be8251 2018-06-04 stsp #include <sys/queue.h>
 18 54be8251 2018-06-04 stsp 
 19 54be8251 2018-06-04 stsp #include <stdlib.h>
 20 54be8251 2018-06-04 stsp #include <string.h>
 21 54be8251 2018-06-04 stsp #include <sha1.h>
 22 54be8251 2018-06-04 stsp #include <stdio.h>
 23 54be8251 2018-06-04 stsp #include <zlib.h>
 24 c6f420bf 2018-06-04 stsp #include <limits.h>
 25 788c352e 2018-06-16 stsp #include <time.h>
 26 54be8251 2018-06-04 stsp 
 27 54be8251 2018-06-04 stsp #include "got_object.h"
 28 54be8251 2018-06-04 stsp #include "got_error.h"
 29 54be8251 2018-06-04 stsp 
 30 54be8251 2018-06-04 stsp #include "got_lib_delta.h"
 31 63581804 2018-07-09 stsp #include "got_lib_inflate.h"
 32 54be8251 2018-06-04 stsp #include "got_lib_object.h"
 33 54be8251 2018-06-04 stsp #include "got_lib_object_idset.h"
 34 54be8251 2018-06-04 stsp 
 35 54be8251 2018-06-04 stsp #ifndef nitems
 36 54be8251 2018-06-04 stsp #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
 37 54be8251 2018-06-04 stsp #endif
 38 54be8251 2018-06-04 stsp 
 39 54be8251 2018-06-04 stsp struct got_object_idset_element {
 40 54be8251 2018-06-04 stsp 	TAILQ_ENTRY(got_object_idset_element) entry;
 41 54be8251 2018-06-04 stsp 	struct got_object_id id;
 42 54be8251 2018-06-04 stsp 	void *data;	/* API user data */
 43 54be8251 2018-06-04 stsp };
 44 54be8251 2018-06-04 stsp 
 45 54be8251 2018-06-04 stsp struct got_object_idset {
 46 54be8251 2018-06-04 stsp 	/*
 47 54be8251 2018-06-04 stsp 	 * A set is implemented as a collection of 256 lists.
 48 54be8251 2018-06-04 stsp 	 * The value of the first byte of an object ID determines
 49 54be8251 2018-06-04 stsp 	 * which of these lists an object ID is stored in.
 50 54be8251 2018-06-04 stsp 	 */
 51 54be8251 2018-06-04 stsp 	TAILQ_HEAD(, got_object_idset_element) entries[0xff + 1];
 52 2bd394ff 2018-06-22 stsp 	int nelem[0xff + 1];
 53 2bd394ff 2018-06-22 stsp 	int totelem;
 54 069f84d5 2018-06-11 stsp #define GOT_OBJECT_IDSET_MAX_ELEM INT_MAX
 55 54be8251 2018-06-04 stsp };
 56 54be8251 2018-06-04 stsp 
 57 54be8251 2018-06-04 stsp struct got_object_idset *
 58 60f2eee1 2018-07-08 stsp got_object_idset_alloc(void)
 59 54be8251 2018-06-04 stsp {
 60 54be8251 2018-06-04 stsp 	struct got_object_idset *set;
 61 54be8251 2018-06-04 stsp 	int i;
 62 54be8251 2018-06-04 stsp 
 63 54be8251 2018-06-04 stsp 	set = calloc(1, sizeof(*set));
 64 54be8251 2018-06-04 stsp 	if (set == NULL)
 65 54be8251 2018-06-04 stsp 		return NULL;
 66 54be8251 2018-06-04 stsp 
 67 54be8251 2018-06-04 stsp 	for (i = 0; i < nitems(set->entries); i++)
 68 54be8251 2018-06-04 stsp 		TAILQ_INIT(&set->entries[i]);
 69 54be8251 2018-06-04 stsp 
 70 54be8251 2018-06-04 stsp 	return set;
 71 54be8251 2018-06-04 stsp }
 72 54be8251 2018-06-04 stsp 
 73 54be8251 2018-06-04 stsp void
 74 54be8251 2018-06-04 stsp got_object_idset_free(struct got_object_idset *set)
 75 54be8251 2018-06-04 stsp {
 76 54be8251 2018-06-04 stsp 	struct got_object_idset_element *entry;
 77 54be8251 2018-06-04 stsp 	int i;
 78 54be8251 2018-06-04 stsp 
 79 54be8251 2018-06-04 stsp 	for (i = 0; i < nitems(set->entries); i++) {
 80 54be8251 2018-06-04 stsp 		while (!TAILQ_EMPTY(&set->entries[i])) {
 81 54be8251 2018-06-04 stsp 			entry = TAILQ_FIRST(&set->entries[i]);
 82 54be8251 2018-06-04 stsp 			TAILQ_REMOVE(&set->entries[i], entry, entry);
 83 54be8251 2018-06-04 stsp 			/* User data should be freed by caller. */
 84 54be8251 2018-06-04 stsp 			free(entry);
 85 54be8251 2018-06-04 stsp 		}
 86 54be8251 2018-06-04 stsp 	}
 87 54be8251 2018-06-04 stsp 	free(set);
 88 54be8251 2018-06-04 stsp }
 89 54be8251 2018-06-04 stsp 
 90 54be8251 2018-06-04 stsp const struct got_error *
 91 b36429ab 2018-11-05 stsp got_object_idset_add(struct got_object_idset *set, struct got_object_id *id,
 92 b36429ab 2018-11-05 stsp     void *data)
 93 54be8251 2018-06-04 stsp {
 94 b36429ab 2018-11-05 stsp 	struct got_object_idset_element *new;
 95 54be8251 2018-06-04 stsp 	uint8_t i = id->sha1[0];
 96 54be8251 2018-06-04 stsp 
 97 2bd394ff 2018-06-22 stsp 	if (set->totelem >= GOT_OBJECT_IDSET_MAX_ELEM)
 98 c6f420bf 2018-06-04 stsp 		return got_error(GOT_ERR_NO_SPACE);
 99 c6f420bf 2018-06-04 stsp 
100 294f39b0 2018-11-05 stsp 	new = malloc(sizeof(*new));
101 54be8251 2018-06-04 stsp 	if (new == NULL)
102 54be8251 2018-06-04 stsp 		return got_error_from_errno();
103 54be8251 2018-06-04 stsp 
104 54be8251 2018-06-04 stsp 	memcpy(&new->id, id, sizeof(new->id));
105 54be8251 2018-06-04 stsp 	new->data = data;
106 54be8251 2018-06-04 stsp 
107 b36429ab 2018-11-05 stsp 	TAILQ_INSERT_HEAD(&set->entries[i], new, entry);
108 b36429ab 2018-11-05 stsp 	set->nelem[i]++;
109 b36429ab 2018-11-05 stsp 	set->totelem++;
110 b36429ab 2018-11-05 stsp 	return NULL;
111 54be8251 2018-06-04 stsp }
112 54be8251 2018-06-04 stsp 
113 54be8251 2018-06-04 stsp void *
114 45b73774 2018-06-04 stsp got_object_idset_get(struct got_object_idset *set, struct got_object_id *id)
115 54be8251 2018-06-04 stsp {
116 60f2eee1 2018-07-08 stsp 	struct got_object_idset_element *entry;
117 54be8251 2018-06-04 stsp 	uint8_t i = id->sha1[0];
118 54be8251 2018-06-04 stsp 
119 60f2eee1 2018-07-08 stsp 	TAILQ_FOREACH(entry, &set->entries[i], entry) {
120 60f2eee1 2018-07-08 stsp 		if (got_object_id_cmp(&entry->id, id) == 0)
121 60f2eee1 2018-07-08 stsp 			return entry->data;
122 54be8251 2018-06-04 stsp 	}
123 54be8251 2018-06-04 stsp 
124 54be8251 2018-06-04 stsp 	return NULL;
125 54be8251 2018-06-04 stsp }
126 54be8251 2018-06-04 stsp 
127 54be8251 2018-06-04 stsp const struct got_error *
128 e7c810ea 2018-06-22 stsp got_object_idset_remove(void **data, struct got_object_idset *set,
129 54be8251 2018-06-04 stsp     struct got_object_id *id)
130 54be8251 2018-06-04 stsp {
131 54be8251 2018-06-04 stsp 	struct got_object_idset_element *entry, *tmp;
132 ac4e69fb 2018-06-22 stsp 	uint8_t i = id->sha1[0];
133 54be8251 2018-06-04 stsp 
134 441e144c 2018-06-22 stsp 	if (data)
135 441e144c 2018-06-22 stsp 		*data = NULL;
136 441e144c 2018-06-22 stsp 
137 2bd394ff 2018-06-22 stsp 	if (set->nelem[i] == 0)
138 c6f420bf 2018-06-04 stsp 		return got_error(GOT_ERR_NO_OBJ);
139 c6f420bf 2018-06-04 stsp 
140 54be8251 2018-06-04 stsp 	TAILQ_FOREACH_SAFE(entry, &set->entries[i], entry, tmp) {
141 ac4e69fb 2018-06-22 stsp 		if (got_object_id_cmp(&entry->id, id) == 0) {
142 54be8251 2018-06-04 stsp 			TAILQ_REMOVE(&set->entries[i], entry, entry);
143 e7c810ea 2018-06-22 stsp 			if (data)
144 e7c810ea 2018-06-22 stsp 				*data = entry->data;
145 4a9bc5ca 2018-06-22 stsp 			free(entry);
146 2bd394ff 2018-06-22 stsp 			set->nelem[i]--;
147 2bd394ff 2018-06-22 stsp 			set->totelem--;
148 54be8251 2018-06-04 stsp 			return NULL;
149 54be8251 2018-06-04 stsp 		}
150 54be8251 2018-06-04 stsp 	}
151 54be8251 2018-06-04 stsp 
152 54be8251 2018-06-04 stsp 	return got_error(GOT_ERR_NO_OBJ);
153 54be8251 2018-06-04 stsp }
154 54be8251 2018-06-04 stsp 
155 54be8251 2018-06-04 stsp int
156 54be8251 2018-06-04 stsp got_object_idset_contains(struct got_object_idset *set,
157 54be8251 2018-06-04 stsp     struct got_object_id *id)
158 54be8251 2018-06-04 stsp {
159 54be8251 2018-06-04 stsp 	struct got_object_idset_element *entry;
160 54be8251 2018-06-04 stsp 	uint8_t i = id->sha1[0];
161 54be8251 2018-06-04 stsp 
162 54be8251 2018-06-04 stsp 	TAILQ_FOREACH(entry, &set->entries[i], entry) {
163 54be8251 2018-06-04 stsp 		if (got_object_id_cmp(&entry->id, id) == 0)
164 54be8251 2018-06-04 stsp 			return 1;
165 54be8251 2018-06-04 stsp 	}
166 54be8251 2018-06-04 stsp 
167 54be8251 2018-06-04 stsp 	return 0;
168 54be8251 2018-06-04 stsp }
169 54be8251 2018-06-04 stsp 
170 54be8251 2018-06-04 stsp void got_object_idset_for_each(struct got_object_idset *set,
171 917bfd05 2018-06-10 stsp     void (*cb)(struct got_object_id *, void *, void *), void *arg)
172 54be8251 2018-06-04 stsp {
173 956a5d5a 2018-06-04 stsp 	struct got_object_idset_element *entry;
174 54be8251 2018-06-04 stsp 	int i;
175 54be8251 2018-06-04 stsp 
176 54be8251 2018-06-04 stsp 	for (i = 0; i < nitems(set->entries); i++) {
177 956a5d5a 2018-06-04 stsp 		TAILQ_FOREACH(entry, &set->entries[i], entry)
178 917bfd05 2018-06-10 stsp 			cb(&entry->id, entry->data, arg);
179 54be8251 2018-06-04 stsp 	}
180 54be8251 2018-06-04 stsp }
181 c6f420bf 2018-06-04 stsp 
182 069f84d5 2018-06-11 stsp int
183 c6f420bf 2018-06-04 stsp got_object_idset_num_elements(struct got_object_idset *set)
184 c6f420bf 2018-06-04 stsp {
185 2bd394ff 2018-06-22 stsp 	return set->totelem;
186 c6f420bf 2018-06-04 stsp }