1 /*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2019 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 #include "private-lib-core.h"
26
27 void
lws_set_fops(struct lws_context * context,const struct lws_plat_file_ops * fops)28 lws_set_fops(struct lws_context *context, const struct lws_plat_file_ops *fops)
29 {
30 context->fops = fops;
31 }
32
33 lws_filepos_t
lws_vfs_tell(lws_fop_fd_t fop_fd)34 lws_vfs_tell(lws_fop_fd_t fop_fd)
35 {
36 return fop_fd->pos;
37 }
38
39 lws_filepos_t
lws_vfs_get_length(lws_fop_fd_t fop_fd)40 lws_vfs_get_length(lws_fop_fd_t fop_fd)
41 {
42 return fop_fd->len;
43 }
44
45 uint32_t
lws_vfs_get_mod_time(lws_fop_fd_t fop_fd)46 lws_vfs_get_mod_time(lws_fop_fd_t fop_fd)
47 {
48 return fop_fd->mod_time;
49 }
50
51 lws_fileofs_t
lws_vfs_file_seek_set(lws_fop_fd_t fop_fd,lws_fileofs_t offset)52 lws_vfs_file_seek_set(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
53 {
54 lws_fileofs_t ofs;
55
56 ofs = fop_fd->fops->LWS_FOP_SEEK_CUR(fop_fd,
57 offset - (lws_fileofs_t)fop_fd->pos);
58
59 return ofs;
60 }
61
62
63 lws_fileofs_t
lws_vfs_file_seek_end(lws_fop_fd_t fop_fd,lws_fileofs_t offset)64 lws_vfs_file_seek_end(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
65 {
66 return fop_fd->fops->LWS_FOP_SEEK_CUR(fop_fd,
67 (lws_fileofs_t)fop_fd->len + (lws_fileofs_t)fop_fd->pos + offset);
68 }
69
70
71 const struct lws_plat_file_ops *
lws_vfs_select_fops(const struct lws_plat_file_ops * fops,const char * vfs_path,const char ** vpath)72 lws_vfs_select_fops(const struct lws_plat_file_ops *fops, const char *vfs_path,
73 const char **vpath)
74 {
75 const struct lws_plat_file_ops *pf;
76 const char *p = vfs_path;
77 int n;
78
79 *vpath = NULL;
80
81 /* no non-platform fops, just use that */
82
83 if (!fops->next)
84 return fops;
85
86 /*
87 * scan the vfs path looking for indications we are to be
88 * handled by a specific fops
89 */
90
91 while (p && *p) {
92 if (*p != '/') {
93 p++;
94 continue;
95 }
96 /* the first one is always platform fops, so skip */
97 pf = fops->next;
98 while (pf) {
99 n = 0;
100 while (n < (int)LWS_ARRAY_SIZE(pf->fi) && pf->fi[n].sig) {
101 if (p >= vfs_path + pf->fi[n].len)
102 if (!strncmp(p - (pf->fi[n].len - 1),
103 pf->fi[n].sig,
104 (unsigned int)(pf->fi[n].len - 1))) {
105 *vpath = p + 1;
106 return pf;
107 }
108
109 n++;
110 }
111 pf = pf->next;
112 }
113 p++;
114 }
115
116 return fops;
117 }
118
119 lws_fop_fd_t LWS_WARN_UNUSED_RESULT
lws_vfs_file_open(const struct lws_plat_file_ops * fops,const char * vfs_path,lws_fop_flags_t * flags)120 lws_vfs_file_open(const struct lws_plat_file_ops *fops, const char *vfs_path,
121 lws_fop_flags_t *flags)
122 {
123 const char *vpath = "";
124 const struct lws_plat_file_ops *selected;
125
126 selected = lws_vfs_select_fops(fops, vfs_path, &vpath);
127
128 return selected->LWS_FOP_OPEN(fops, vfs_path, vpath, flags);
129 }
130
131
132 struct lws_plat_file_ops *
lws_get_fops(struct lws_context * context)133 lws_get_fops(struct lws_context *context)
134 {
135 return (struct lws_plat_file_ops *)context->fops;
136 }
137
138