This source file includes following definitions.
- isofs_name_translate
- get_acorn_filename
- do_isofs_readdir
- isofs_readdir
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14 #include <linux/gfp.h>
15 #include "isofs.h"
16
17 int isofs_name_translate(struct iso_directory_record *de, char *new, struct inode *inode)
18 {
19 char * old = de->name;
20 int len = de->name_len[0];
21 int i;
22
23 for (i = 0; i < len; i++) {
24 unsigned char c = old[i];
25 if (!c)
26 break;
27
28 if (c >= 'A' && c <= 'Z')
29 c |= 0x20;
30
31
32 if (c == '.' && i == len - 3 && old[i + 1] == ';' && old[i + 2] == '1')
33 break;
34
35
36 if (c == ';' && i == len - 2 && old[i + 1] == '1')
37 break;
38
39
40
41 if (c == ';' || c == '/')
42 c = '.';
43
44 new[i] = c;
45 }
46 return i;
47 }
48
49
50 int get_acorn_filename(struct iso_directory_record *de,
51 char *retname, struct inode *inode)
52 {
53 int std;
54 unsigned char *chr;
55 int retnamlen = isofs_name_translate(de, retname, inode);
56
57 if (retnamlen == 0)
58 return 0;
59 std = sizeof(struct iso_directory_record) + de->name_len[0];
60 if (std & 1)
61 std++;
62 if (de->length[0] - std != 32)
63 return retnamlen;
64 chr = ((unsigned char *) de) + std;
65 if (strncmp(chr, "ARCHIMEDES", 10))
66 return retnamlen;
67 if ((*retname == '_') && ((chr[19] & 1) == 1))
68 *retname = '!';
69 if (((de->flags[0] & 2) == 0) && (chr[13] == 0xff)
70 && ((chr[12] & 0xf0) == 0xf0)) {
71 retname[retnamlen] = ',';
72 sprintf(retname+retnamlen+1, "%3.3x",
73 ((chr[12] & 0xf) << 8) | chr[11]);
74 retnamlen += 4;
75 }
76 return retnamlen;
77 }
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81
82 static int do_isofs_readdir(struct inode *inode, struct file *file,
83 struct dir_context *ctx,
84 char *tmpname, struct iso_directory_record *tmpde)
85 {
86 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
87 unsigned char bufbits = ISOFS_BUFFER_BITS(inode);
88 unsigned long block, offset, block_saved, offset_saved;
89 unsigned long inode_number = 0;
90 struct buffer_head *bh = NULL;
91 int len;
92 int map;
93 int first_de = 1;
94 char *p = NULL;
95 struct iso_directory_record *de;
96 struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb);
97
98 offset = ctx->pos & (bufsize - 1);
99 block = ctx->pos >> bufbits;
100
101 while (ctx->pos < inode->i_size) {
102 int de_len;
103
104 if (!bh) {
105 bh = isofs_bread(inode, block);
106 if (!bh)
107 return 0;
108 }
109
110 de = (struct iso_directory_record *) (bh->b_data + offset);
111
112 de_len = *(unsigned char *)de;
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119
120 if (de_len == 0) {
121 brelse(bh);
122 bh = NULL;
123 ctx->pos = (ctx->pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
124 block = ctx->pos >> bufbits;
125 offset = 0;
126 continue;
127 }
128
129 block_saved = block;
130 offset_saved = offset;
131 offset += de_len;
132
133
134 if (offset >= bufsize) {
135 int slop = bufsize - offset + de_len;
136 memcpy(tmpde, de, slop);
137 offset &= bufsize - 1;
138 block++;
139 brelse(bh);
140 bh = NULL;
141 if (offset) {
142 bh = isofs_bread(inode, block);
143 if (!bh)
144 return 0;
145 memcpy((void *) tmpde + slop, bh->b_data, offset);
146 }
147 de = tmpde;
148 }
149
150 if (de_len < de->name_len[0] +
151 sizeof(struct iso_directory_record)) {
152 printk(KERN_NOTICE "iso9660: Corrupted directory entry"
153 " in block %lu of inode %lu\n", block,
154 inode->i_ino);
155 return -EIO;
156 }
157
158 if (first_de) {
159 isofs_normalize_block_and_offset(de,
160 &block_saved,
161 &offset_saved);
162 inode_number = isofs_get_ino(block_saved,
163 offset_saved, bufbits);
164 }
165
166 if (de->flags[-sbi->s_high_sierra] & 0x80) {
167 first_de = 0;
168 ctx->pos += de_len;
169 continue;
170 }
171 first_de = 1;
172
173
174 if (de->name_len[0] == 1 && de->name[0] == 0) {
175 if (!dir_emit_dot(file, ctx))
176 break;
177 ctx->pos += de_len;
178 continue;
179 }
180
181 len = 0;
182
183
184 if (de->name_len[0] == 1 && de->name[0] == 1) {
185 if (!dir_emit_dotdot(file, ctx))
186 break;
187 ctx->pos += de_len;
188 continue;
189 }
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198 if ((sbi->s_hide && (de->flags[-sbi->s_high_sierra] & 1)) ||
199 (!sbi->s_showassoc &&
200 (de->flags[-sbi->s_high_sierra] & 4))) {
201 ctx->pos += de_len;
202 continue;
203 }
204
205 map = 1;
206 if (sbi->s_rock) {
207 len = get_rock_ridge_filename(de, tmpname, inode);
208 if (len != 0) {
209 p = tmpname;
210 map = 0;
211 }
212 }
213 if (map) {
214 #ifdef CONFIG_JOLIET
215 if (sbi->s_joliet_level) {
216 len = get_joliet_filename(de, tmpname, inode);
217 p = tmpname;
218 } else
219 #endif
220 if (sbi->s_mapping == 'a') {
221 len = get_acorn_filename(de, tmpname, inode);
222 p = tmpname;
223 } else
224 if (sbi->s_mapping == 'n') {
225 len = isofs_name_translate(de, tmpname, inode);
226 p = tmpname;
227 } else {
228 p = de->name;
229 len = de->name_len[0];
230 }
231 }
232 if (len > 0) {
233 if (!dir_emit(ctx, p, len, inode_number, DT_UNKNOWN))
234 break;
235 }
236 ctx->pos += de_len;
237
238 continue;
239 }
240 if (bh)
241 brelse(bh);
242 return 0;
243 }
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249
250 static int isofs_readdir(struct file *file, struct dir_context *ctx)
251 {
252 int result;
253 char *tmpname;
254 struct iso_directory_record *tmpde;
255 struct inode *inode = file_inode(file);
256
257 tmpname = (char *)__get_free_page(GFP_KERNEL);
258 if (tmpname == NULL)
259 return -ENOMEM;
260
261 tmpde = (struct iso_directory_record *) (tmpname+1024);
262
263 result = do_isofs_readdir(inode, file, ctx, tmpname, tmpde);
264
265 free_page((unsigned long) tmpname);
266 return result;
267 }
268
269 const struct file_operations isofs_dir_operations =
270 {
271 .llseek = generic_file_llseek,
272 .read = generic_read_dir,
273 .iterate_shared = isofs_readdir,
274 };
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278
279 const struct inode_operations isofs_dir_inode_operations =
280 {
281 .lookup = isofs_lookup,
282 };
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