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1 /*
2  * libwebsockets - small server side websockets and web server implementation
3  *
4  * Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to
8  * deal in the Software without restriction, including without limitation the
9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10  * sell copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22  * IN THE SOFTWARE.
23  */
24 
25 #if !defined(__LWS_PRIVATE_LIB_MISC_LWSAC_H__)
26 #define __LWS_PRIVATE_LIB_MISC_LWSAC_H__
27 
28 #if !defined(LWS_PLAT_OPTEE)
29 #include <sys/stat.h>
30 #endif
31 
32 /* under page size of 4096 to allow overhead */
33 #define LWSAC_CHUNK_SIZE 4000
34 
35 /*
36  * the chunk list members all point back to the head themselves so the list
37  * can be detached from the formal head and free itself when its reference
38  * count reaches zero.
39  */
40 
41 /*
42  * One of these per chunk
43  */
44 
45 struct lwsac {
46 	struct lwsac *next;
47 	struct lwsac *head; /* pointer back to the first chunk */
48 	size_t alloc_size; /* alloc size of the whole chunk */
49 	size_t ofs; /* next writeable position inside chunk */
50 };
51 
52 /*
53  * One of these per lwsac, at start of first chunk
54  */
55 
56 struct lwsac_head {
57 	struct lwsac *curr;
58 	size_t total_alloc_size;
59 	int refcount;
60 	int total_blocks;
61 	char detached; /* if our refcount gets to zero, free the chunk list */
62 };
63 
64 #if !defined(LWS_PLAT_OPTEE)
65 struct cached_file_info {
66 	struct stat s;
67 	time_t last_confirm;
68 };
69 #endif
70 #endif
71