source: MondoRescue/branches/2.2.9/mindi-busybox/util-linux/volume_id/util.c@ 3320

Last change on this file since 3320 was 3320, checked in by Bruno Cornec, 9 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
  • Property svn:eol-style set to native
File size: 7.0 KB
Line 
1/*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include "volume_id_internal.h"
22
23void volume_id_set_unicode16(char *str, size_t len, const uint8_t *buf, enum endian endianess, size_t count)
24{
25 unsigned i, j;
26 unsigned c;
27
28 j = 0;
29 for (i = 0; i + 2 <= count; i += 2) {
30 if (endianess == LE)
31 c = (buf[i+1] << 8) | buf[i];
32 else
33 c = (buf[i] << 8) | buf[i+1];
34 if (c == 0) {
35 str[j] = '\0';
36 break;
37 } else if (c < 0x80) {
38 if (j+1 >= len)
39 break;
40 str[j++] = (uint8_t) c;
41 } else if (c < 0x800) {
42 if (j+2 >= len)
43 break;
44 str[j++] = (uint8_t) (0xc0 | (c >> 6));
45 str[j++] = (uint8_t) (0x80 | (c & 0x3f));
46 } else {
47 if (j+3 >= len)
48 break;
49 str[j++] = (uint8_t) (0xe0 | (c >> 12));
50 str[j++] = (uint8_t) (0x80 | ((c >> 6) & 0x3f));
51 str[j++] = (uint8_t) (0x80 | (c & 0x3f));
52 }
53 }
54 str[j] = '\0';
55}
56
57#ifdef UNUSED
58static const char *usage_to_string(enum volume_id_usage usage_id)
59{
60 switch (usage_id) {
61 case VOLUME_ID_FILESYSTEM:
62 return "filesystem";
63 case VOLUME_ID_PARTITIONTABLE:
64 return "partitiontable";
65 case VOLUME_ID_OTHER:
66 return "other";
67 case VOLUME_ID_RAID:
68 return "raid";
69 case VOLUME_ID_DISKLABEL:
70 return "disklabel";
71 case VOLUME_ID_CRYPTO:
72 return "crypto";
73 case VOLUME_ID_UNPROBED:
74 return "unprobed";
75 case VOLUME_ID_UNUSED:
76 return "unused";
77 }
78 return NULL;
79}
80
81void volume_id_set_usage_part(struct volume_id_partition *part, enum volume_id_usage usage_id)
82{
83 part->usage_id = usage_id;
84 part->usage = usage_to_string(usage_id);
85}
86
87void volume_id_set_usage(struct volume_id *id, enum volume_id_usage usage_id)
88{
89 id->usage_id = usage_id;
90 id->usage = usage_to_string(usage_id);
91}
92
93void volume_id_set_label_raw(struct volume_id *id, const uint8_t *buf, size_t count)
94{
95 memcpy(id->label_raw, buf, count);
96 id->label_raw_len = count;
97}
98#endif
99
100#ifdef NOT_NEEDED
101static size_t strnlen(const char *s, size_t maxlen)
102{
103 size_t i;
104 if (!maxlen) return 0;
105 if (!s) return 0;
106 for (i = 0; *s && i < maxlen; ++s) ++i;
107 return i;
108}
109#endif
110
111void volume_id_set_label_string(struct volume_id *id, const uint8_t *buf, size_t count)
112{
113 unsigned i;
114
115 memcpy(id->label, buf, count);
116
117 /* remove trailing whitespace */
118 i = strnlen(id->label, count);
119 while (i--) {
120 if (!isspace(id->label[i]))
121 break;
122 }
123 id->label[i+1] = '\0';
124}
125
126void volume_id_set_label_unicode16(struct volume_id *id, const uint8_t *buf, enum endian endianess, size_t count)
127{
128 volume_id_set_unicode16(id->label, sizeof(id->label), buf, endianess, count);
129}
130
131void volume_id_set_uuid(struct volume_id *id, const uint8_t *buf, enum uuid_format format)
132{
133 unsigned i;
134 unsigned count = 0;
135
136 switch (format) {
137 case UUID_DOS:
138 count = 4;
139 break;
140 case UUID_NTFS:
141 case UUID_HFS:
142 count = 8;
143 break;
144 case UUID_DCE:
145 count = 16;
146 break;
147 case UUID_DCE_STRING:
148 /* 36 is ok, id->uuid has one extra byte for NUL */
149 count = VOLUME_ID_UUID_SIZE;
150 break;
151 }
152// memcpy(id->uuid_raw, buf, count);
153// id->uuid_raw_len = count;
154
155 /* if set, create string in the same format, the native platform uses */
156 for (i = 0; i < count; i++)
157 if (buf[i] != 0)
158 goto set;
159 return; /* all bytes are zero, leave it empty ("") */
160
161set:
162 switch (format) {
163 case UUID_DOS:
164 sprintf(id->uuid, "%02X%02X-%02X%02X",
165 buf[3], buf[2], buf[1], buf[0]);
166 break;
167 case UUID_NTFS:
168 sprintf(id->uuid, "%02X%02X%02X%02X%02X%02X%02X%02X",
169 buf[7], buf[6], buf[5], buf[4],
170 buf[3], buf[2], buf[1], buf[0]);
171 break;
172 case UUID_HFS:
173 sprintf(id->uuid, "%02X%02X%02X%02X%02X%02X%02X%02X",
174 buf[0], buf[1], buf[2], buf[3],
175 buf[4], buf[5], buf[6], buf[7]);
176 break;
177 case UUID_DCE:
178 sprintf(id->uuid,
179 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
180 buf[0], buf[1], buf[2], buf[3],
181 buf[4], buf[5],
182 buf[6], buf[7],
183 buf[8], buf[9],
184 buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
185 break;
186 case UUID_DCE_STRING:
187 memcpy(id->uuid, buf, count);
188 id->uuid[count] = '\0';
189 break;
190 }
191}
192
193/* Do not use xlseek here. With it, single corrupted filesystem
194 * may result in attempt to seek past device -> exit.
195 * It's better to ignore such fs and continue. */
196void *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len)
197{
198 uint8_t *dst;
199 unsigned small_off;
200 ssize_t read_len;
201
202 dbg("get buffer off 0x%llx(%llu), len 0x%zx",
203 (unsigned long long) off, (unsigned long long) off, len);
204
205 /* check if requested area fits in superblock buffer */
206 if (off + len <= SB_BUFFER_SIZE
207 /* && off <= SB_BUFFER_SIZE - want this paranoid overflow check? */
208 ) {
209 if (id->sbbuf == NULL) {
210 id->sbbuf = xmalloc(SB_BUFFER_SIZE);
211 }
212 small_off = off;
213 dst = id->sbbuf;
214
215 /* check if we need to read */
216 len += off;
217 if (len <= id->sbbuf_len)
218 goto ret; /* we already have it */
219
220 dbg("read sbbuf len:0x%x", (unsigned) len);
221 id->sbbuf_len = len;
222 off = 0;
223 goto do_read;
224 }
225
226 if (len > SEEK_BUFFER_SIZE) {
227 dbg("seek buffer too small %d", SEEK_BUFFER_SIZE);
228 return NULL;
229 }
230 dst = id->seekbuf;
231
232 /* check if we need to read */
233 if ((off >= id->seekbuf_off)
234 && ((off + len) <= (id->seekbuf_off + id->seekbuf_len))
235 ) {
236 small_off = off - id->seekbuf_off; /* can't overflow */
237 goto ret; /* we already have it */
238 }
239
240 id->seekbuf_off = off;
241 id->seekbuf_len = len;
242 id->seekbuf = xrealloc(id->seekbuf, len);
243 small_off = 0;
244 dst = id->seekbuf;
245 dbg("read seekbuf off:0x%llx len:0x%zx",
246 (unsigned long long) off, len);
247 do_read:
248 if (lseek(id->fd, off, SEEK_SET) != off) {
249 dbg("seek(0x%llx) failed", (unsigned long long) off);
250 goto err;
251 }
252 read_len = full_read(id->fd, dst, len);
253 if (read_len != len) {
254 dbg("requested 0x%x bytes, got 0x%x bytes",
255 (unsigned) len, (unsigned) read_len);
256 err:
257 /* No filesystem can be this tiny. It's most likely
258 * non-associated loop device, empty drive and so on.
259 * Flag it, making it possible to short circuit future
260 * accesses. Rationale:
261 * users complained of slow blkid due to empty floppy drives.
262 */
263 if (off < 64*1024)
264 id->error = 1;
265 /* id->seekbuf_len or id->sbbuf_len is wrong now! Fixing. */
266 volume_id_free_buffer(id);
267 return NULL;
268 }
269 ret:
270 return dst + small_off;
271}
272
273void volume_id_free_buffer(struct volume_id *id)
274{
275 free(id->sbbuf);
276 id->sbbuf = NULL;
277 id->sbbuf_len = 0;
278 free(id->seekbuf);
279 id->seekbuf = NULL;
280 id->seekbuf_len = 0;
281 id->seekbuf_off = 0; /* paranoia */
282}
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