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comparison src/libmlk-core/core/vfs-zip.c @ 335:68287c7bcdb5

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core: implement vfs-zip (read-only)
author David Demelier <markand@malikania.fr>
date Wed, 13 Oct 2021 15:58:02 +0200
parents
children 460c78706989
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334:1d3e6108cb99 335:68287c7bcdb5
1 /*
2 * vfs-zip.c -- VFS subsystem for zip archives
3 *
4 * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <assert.h>
20 #include <string.h>
21
22 #include <zip.h>
23
24 #include "error.h"
25 #include "vfs-zip.h"
26 #include "vfs.h"
27
28 static inline int
29 mkflags(const char *mode)
30 {
31 /* TODO: this should check for mutual exclusions. */
32 int flags = 0;
33
34 for (; *mode; ++mode) {
35 switch (*mode) {
36 case 'w':
37 flags |= ZIP_CREATE;
38 break;
39 case 'x':
40 flags |= ZIP_EXCL;
41 break;
42 case '+':
43 flags |= ZIP_TRUNCATE;
44 break;
45 case 'r':
46 flags |= ZIP_RDONLY;
47 break;
48 default:
49 break;
50 }
51 }
52
53 return flags;
54 }
55
56 static size_t
57 file_read(struct vfs_file *file, void *buf, size_t bufsz)
58 {
59 return zip_fread(file->data, buf, bufsz);
60 }
61
62 static size_t
63 file_write(struct vfs_file *file, const void *buf, size_t bufsz)
64 {
65 (void)file;
66 (void)buf;
67 (void)bufsz;
68
69 return errorf("operation not supported");
70 }
71
72 static int
73 file_flush(struct vfs_file *file)
74 {
75 (void)file;
76
77 return 0;
78 }
79
80 static void
81 file_finish(struct vfs_file *file)
82 {
83 zip_fclose(file->data);
84 }
85
86 static int
87 impl_open(struct vfs *vfs, struct vfs_file *file, const char *entry, const char *mode)
88 {
89 (void)mode;
90
91 if (!(file->data = zip_fopen(vfs->data, entry, 0)))
92 return errorf("unable to open file in archive");
93
94 file->read = file_read;
95 file->write = file_write;
96 file->flush = file_flush;
97 file->finish = file_finish;
98
99 return 0;
100 }
101
102 static void
103 impl_finish(struct vfs *vfs)
104 {
105 zip_close(vfs->data);
106 }
107
108 int
109 vfs_zip(struct vfs *vfs, const char *file, const char *mode)
110 {
111 assert(vfs);
112 assert(file);
113
114 memset(vfs, 0, sizeof (*vfs));
115
116 if (!(vfs->data = zip_open(file, mkflags(mode), NULL)))
117 return errorf("%s: unable to open zip file", file);
118
119 vfs->open = impl_open;
120 vfs->finish = impl_finish;
121
122 return 0;
123 }