1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 struct got_delta_cache_entry {
18 	off_t data_offset;
19 	uint8_t *delta_buf;
20 	size_t delta_len;
21 };
22 
23 #define GOT_DELTA_CACHE_SIZE	1024
24 
25 struct got_delta_cache {
26 	char *path_packfile;
27 	struct got_delta_cache_entry deltas[GOT_DELTA_CACHE_SIZE];
28 };
29 
30 #define GOT_PACK_CACHE_SIZE	64
31 
32 struct got_pack_cache {
33 	struct got_packidx_v2_hdr *packidx;
34 	char *path_packfile;
35 	FILE *packfile;
36 };
37 
38 struct got_repository {
39 	char *path;
40 	char *path_git_dir;
41 
42 	/* 
43 	 * The pack cache speeds up search for packed objects and
44 	 * avoids duplicate open file handles to pack files.
45 	 */
46 	struct got_pack_cache pack_cache[GOT_PACK_CACHE_SIZE];
47 
48 	/* The delta cache speeds up reconstruction of packed objects. */
49 	struct got_delta_cache delta_cache[GOT_PACK_CACHE_SIZE];
50 };
51