cifs: fix potential buffer overrun when composing a new options string
[linux-2.6.git] / fs / nls / nls_ascii.c
1 /*
2  * linux/fs/nls/nls_ascii.c
3  *
4  * Charset ascii translation tables.
5  * Generated automatically from the Unicode and charset
6  * tables from the Unicode Organization (www.unicode.org).
7  * The Unicode to charset table has only exact mappings.
8  */
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/nls.h>
14 #include <linux/errno.h>
15
16 static const wchar_t charset2uni[256] = {
17         /* 0x00*/
18         0x0000, 0x0001, 0x0002, 0x0003,
19         0x0004, 0x0005, 0x0006, 0x0007,
20         0x0008, 0x0009, 0x000a, 0x000b,
21         0x000c, 0x000d, 0x000e, 0x000f,
22         /* 0x10*/
23         0x0010, 0x0011, 0x0012, 0x0013,
24         0x0014, 0x0015, 0x0016, 0x0017,
25         0x0018, 0x0019, 0x001a, 0x001b,
26         0x001c, 0x001d, 0x001e, 0x001f,
27         /* 0x20*/
28         0x0020, 0x0021, 0x0022, 0x0023,
29         0x0024, 0x0025, 0x0026, 0x0027,
30         0x0028, 0x0029, 0x002a, 0x002b,
31         0x002c, 0x002d, 0x002e, 0x002f,
32         /* 0x30*/
33         0x0030, 0x0031, 0x0032, 0x0033,
34         0x0034, 0x0035, 0x0036, 0x0037,
35         0x0038, 0x0039, 0x003a, 0x003b,
36         0x003c, 0x003d, 0x003e, 0x003f,
37         /* 0x40*/
38         0x0040, 0x0041, 0x0042, 0x0043,
39         0x0044, 0x0045, 0x0046, 0x0047,
40         0x0048, 0x0049, 0x004a, 0x004b,
41         0x004c, 0x004d, 0x004e, 0x004f,
42         /* 0x50*/
43         0x0050, 0x0051, 0x0052, 0x0053,
44         0x0054, 0x0055, 0x0056, 0x0057,
45         0x0058, 0x0059, 0x005a, 0x005b,
46         0x005c, 0x005d, 0x005e, 0x005f,
47         /* 0x60*/
48         0x0060, 0x0061, 0x0062, 0x0063,
49         0x0064, 0x0065, 0x0066, 0x0067,
50         0x0068, 0x0069, 0x006a, 0x006b,
51         0x006c, 0x006d, 0x006e, 0x006f,
52         /* 0x70*/
53         0x0070, 0x0071, 0x0072, 0x0073,
54         0x0074, 0x0075, 0x0076, 0x0077,
55         0x0078, 0x0079, 0x007a, 0x007b,
56         0x007c, 0x007d, 0x007e, 0x007f,
57 };
58
59 static const unsigned char page00[256] = {
60         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
61         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
62         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
63         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
64         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
65         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
66         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
67         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
68         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
69         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
70         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
71         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
72         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
73         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
74         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
75         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
76 };
77
78 static const unsigned char *const page_uni2charset[256] = {
79         page00,
80 };
81
82 static const unsigned char charset2lower[256] = {
83         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
84         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
85         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
86         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
87         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
88         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
89         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
90         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
91         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
92         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
93         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
94         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
95         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
96         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
97         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
98         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
99 };
100
101 static const unsigned char charset2upper[256] = {
102         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
103         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
104         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
105         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
106         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
107         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
108         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
109         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
110         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
111         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
112         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
113         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
114         0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
115         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
116         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
117         0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
118 };
119
120 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
121 {
122         const unsigned char *uni2charset;
123         unsigned char cl = uni & 0x00ff;
124         unsigned char ch = (uni & 0xff00) >> 8;
125
126         if (boundlen <= 0)
127                 return -ENAMETOOLONG;
128
129         uni2charset = page_uni2charset[ch];
130         if (uni2charset && uni2charset[cl])
131                 out[0] = uni2charset[cl];
132         else
133                 return -EINVAL;
134         return 1;
135 }
136
137 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
138 {
139         *uni = charset2uni[*rawstring];
140         if (*uni == 0x0000)
141                 return -EINVAL;
142         return 1;
143 }
144
145 static struct nls_table table = {
146         .charset        = "ascii",
147         .uni2char       = uni2char,
148         .char2uni       = char2uni,
149         .charset2lower  = charset2lower,
150         .charset2upper  = charset2upper,
151         .owner          = THIS_MODULE,
152 };
153
154 static int __init init_nls_ascii(void)
155 {
156         return register_nls(&table);
157 }
158
159 static void __exit exit_nls_ascii(void)
160 {
161         unregister_nls(&table);
162 }
163
164 module_init(init_nls_ascii)
165 module_exit(exit_nls_ascii)
166
167 MODULE_LICENSE("Dual BSD/GPL");