1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define FILE_DB_HASHSIZE	8192
18
19struct files_db_s {
20	char *filename;
21	int fileno;
22	struct files_db_s *next;
23	size_t	size;
24	int	global_filename_ix;
25};
26
27/* Lifted from Wikipedia Jenkins Hash function page */
28static inline u_int32_t
29jenkins_one_at_a_time_hash(char *key, size_t len)
30{
31	u_int32_t hash, i;
32
33	for(hash = i = 0; i < len; ++i) {
34		hash += key[i];
35		hash += (hash << 10);
36		hash ^= (hash >> 6);
37	}
38	hash += (hash << 3);
39	hash ^= (hash >> 11);
40	hash += (hash << 15);
41	return hash;
42}
43
44static inline void
45files_db_update_size(void *node, u_int64_t new_size)
46{
47	struct files_db_s *db_node = (struct files_db_s *)node;
48
49	if (db_node->size < new_size)
50		db_node->size = new_size;
51}
52
53static inline void
54files_db_add_to_size(void *node, u_int64_t size_incr)
55{
56	((struct files_db_s *)node)->size += size_incr;
57}
58
59static inline int
60files_db_get_fileno(void *node)
61{
62	return (((struct files_db_s *)node)->fileno);
63}
64
65static inline char *
66files_db_get_filename(void *node)
67{
68	return (((struct files_db_s *)node)->filename);
69}
70
71
72void *files_db_create_handle(void);
73void files_db_write_objects(FILE *fp);
74void *files_db_add(char *filename);
75void *files_db_lookup(char *filename);
76int files_db_get_total_obj(void);
77void init_filename_cache(void);
78void store_filename_cache(void);
79
80
81
82