1 /*
2 * encoding.c --- convert between encoding magic numbers and strings
3 *
4 * Copyright (C) 2018 Collabora Ltd.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12 #include "config.h"
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <ctype.h>
17 #include <errno.h>
18 #include <stdio.h>
19
20 #include "e2p.h"
21
22 #define ARRAY_SIZE(array) \
23 (sizeof(array) / sizeof(array[0]))
24
25 static const struct {
26 const char *name;
27 __u16 encoding_magic;
28 __u16 default_flags;
29
30 } ext4_encoding_map[] = {
31 {
32 .encoding_magic = EXT4_ENC_UTF8_12_1,
33 .name = "utf8-12.1",
34 .default_flags = 0,
35 },
36 {
37 .encoding_magic = EXT4_ENC_UTF8_12_1,
38 .name = "utf8",
39 .default_flags = 0,
40 },
41 };
42
43 static const struct enc_flags {
44 __u16 flag;
45 const char *param;
46 } encoding_flags[] = {
47 { EXT4_ENC_STRICT_MODE_FL, "strict" },
48 };
49
50 /* Return a positive number < 0xff indicating the encoding magic number
51 * or a negative value indicating error. */
e2p_str2encoding(const char * string)52 int e2p_str2encoding(const char *string)
53 {
54 unsigned int i;
55
56 for (i = 0 ; i < ARRAY_SIZE(ext4_encoding_map); i++)
57 if (!strcmp(string, ext4_encoding_map[i].name))
58 return ext4_encoding_map[i].encoding_magic;
59
60 return -EINVAL;
61 }
62
63 /* Return the name of an encoding or NULL */
e2p_encoding2str(int encoding)64 const char *e2p_encoding2str(int encoding)
65 {
66 unsigned int i;
67 static char buf[32];
68
69 for (i = 0 ; i < ARRAY_SIZE(ext4_encoding_map); i++)
70 if (ext4_encoding_map[i].encoding_magic == encoding)
71 return ext4_encoding_map[i].name;
72 sprintf(buf, "UNKNOWN_ENCODING_%d", encoding);
73 return buf;
74 }
75
e2p_get_encoding_flags(int encoding)76 int e2p_get_encoding_flags(int encoding)
77 {
78 unsigned int i;
79
80 for (i = 0 ; i < ARRAY_SIZE(ext4_encoding_map); i++)
81 if (ext4_encoding_map[i].encoding_magic == encoding)
82 return ext4_encoding_map[i].default_flags;
83
84 return 0;
85 }
86
e2p_str2encoding_flags(int encoding,char * param,__u16 * flags)87 int e2p_str2encoding_flags(int encoding, char *param, __u16 *flags)
88 {
89 char *f = strtok(param, "-");
90 const struct enc_flags *fl;
91 unsigned int i, neg = 0;
92
93 if (encoding != EXT4_ENC_UTF8_12_1)
94 return -EINVAL;
95 while (f) {
96 neg = 0;
97 if (!strncmp("no", f, 2)) {
98 neg = 1;
99 f += 2;
100 }
101
102 for (i = 0; i < ARRAY_SIZE(encoding_flags); i++) {
103 fl = &encoding_flags[i];
104 if (!strcmp(fl->param, f)) {
105 if (neg)
106 *flags &= ~fl->flag;
107 else
108 *flags |= fl->flag;
109
110 goto next_flag;
111 }
112 }
113 return -EINVAL;
114 next_flag:
115 f = strtok(NULL, "-");
116 }
117 return 0;
118 }
119