2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
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.
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.
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
38 #include "volume_id.h"
42 void volume_id_set_unicode16(char *str, size_t len, const uint8_t *buf, enum endian endianess, size_t count)
48 for (i = 0; i + 2 <= count; i += 2) {
50 c = (buf[i+1] << 8) | buf[i];
52 c = (buf[i] << 8) | buf[i+1];
56 } else if (c < 0x80) {
59 str[j++] = (uint8_t) c;
60 } else if (c < 0x800) {
63 str[j++] = (uint8_t) (0xc0 | (c >> 6));
64 str[j++] = (uint8_t) (0x80 | (c & 0x3f));
68 str[j++] = (uint8_t) (0xe0 | (c >> 12));
69 str[j++] = (uint8_t) (0x80 | ((c >> 6) & 0x3f));
70 str[j++] = (uint8_t) (0x80 | (c & 0x3f));
76 static char *usage_to_string(enum volume_id_usage usage_id)
79 case VOLUME_ID_FILESYSTEM:
81 case VOLUME_ID_PARTITIONTABLE:
82 return "partitiontable";
87 case VOLUME_ID_DISKLABEL:
89 case VOLUME_ID_CRYPTO:
91 case VOLUME_ID_UNPROBED:
93 case VOLUME_ID_UNUSED:
99 void volume_id_set_usage_part(struct volume_id_partition *part, enum volume_id_usage usage_id)
101 part->usage_id = usage_id;
102 part->usage = usage_to_string(usage_id);
105 void volume_id_set_usage(struct volume_id *id, enum volume_id_usage usage_id)
107 id->usage_id = usage_id;
108 id->usage = usage_to_string(usage_id);
111 void volume_id_set_label_raw(struct volume_id *id, const uint8_t *buf, size_t count)
113 memcpy(id->label_raw, buf, count);
114 id->label_raw_len = count;
117 static size_t my_strnlen(const char *s, size_t max) {
119 for (; *p && max--; ++p);
123 void volume_id_set_label_string(struct volume_id *id, const uint8_t *buf, size_t count)
127 memcpy(id->label, buf, count);
129 /* remove trailing whitespace */
130 i = my_strnlen(id->label, count);
132 if (!isspace(id->label[i]))
135 id->label[i+1] = '\0';
138 void volume_id_set_label_unicode16(struct volume_id *id, const uint8_t *buf, enum endian endianess, size_t count)
140 volume_id_set_unicode16(id->label, sizeof(id->label), buf, endianess, count);
143 void volume_id_set_uuid(struct volume_id *id, const uint8_t *buf, enum uuid_format format)
146 unsigned int count = 0;
159 case UUID_DCE_STRING:
163 memcpy(id->uuid_raw, buf, count);
164 id->uuid_raw_len = count;
166 /* if set, create string in the same format, the native platform uses */
167 for (i = 0; i < count; i++)
175 sprintf(id->uuid, "%02X%02X-%02X%02X",
176 buf[3], buf[2], buf[1], buf[0]);
179 sprintf(id->uuid,"%02X%02X%02X%02X%02X%02X%02X%02X",
180 buf[7], buf[6], buf[5], buf[4],
181 buf[3], buf[2], buf[1], buf[0]);
184 sprintf(id->uuid,"%02X%02X%02X%02X%02X%02X%02X%02X",
185 buf[0], buf[1], buf[2], buf[3],
186 buf[4], buf[5], buf[6], buf[7]);
190 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
191 buf[0], buf[1], buf[2], buf[3],
195 buf[10], buf[11], buf[12], buf[13], buf[14],buf[15]);
197 case UUID_DCE_STRING:
198 memcpy(id->uuid, buf, count);
199 id->uuid[count] = '\0';
204 uint8_t *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len)
208 dbg("get buffer off 0x%llx(%llu), len 0x%zx", (unsigned long long) off, (unsigned long long) off, len);
209 /* check if requested area fits in superblock buffer */
210 if (off + len <= SB_BUFFER_SIZE) {
211 if (id->sbbuf == NULL) {
212 id->sbbuf = malloc(SB_BUFFER_SIZE);
213 if (id->sbbuf == NULL)
217 /* check if we need to read */
218 if ((off + len) > id->sbbuf_len) {
219 dbg("read sbbuf len:0x%llx", (unsigned long long) (off + len));
220 lseek(id->fd, 0, SEEK_SET);
221 buf_len = read(id->fd, id->sbbuf, off + len);
222 dbg("got 0x%zx (%zi) bytes", buf_len, buf_len);
223 id->sbbuf_len = buf_len;
224 if (buf_len < off + len)
228 return &(id->sbbuf[off]);
230 if (len > SEEK_BUFFER_SIZE) {
231 dbg("seek buffer too small %d", SEEK_BUFFER_SIZE);
235 /* get seek buffer */
236 if (id->seekbuf == NULL) {
237 id->seekbuf = malloc(SEEK_BUFFER_SIZE);
238 if (id->seekbuf == NULL)
242 /* check if we need to read */
243 if ((off < id->seekbuf_off) || ((off + len) > (id->seekbuf_off + id->seekbuf_len))) {
244 dbg("read seekbuf off:0x%llx len:0x%zx", (unsigned long long) off, len);
245 if (lseek(id->fd, off, SEEK_SET) == -1)
247 buf_len = read(id->fd, id->seekbuf, len);
248 dbg("got 0x%zx (%zi) bytes", buf_len, buf_len);
249 id->seekbuf_off = off;
250 id->seekbuf_len = buf_len;
252 dbg("requested 0x%zx bytes, got only 0x%zx bytes", len, buf_len);
257 return &(id->seekbuf[off - id->seekbuf_off]);
261 void volume_id_free_buffer(struct volume_id *id)
263 if (id->sbbuf != NULL) {
268 if (id->seekbuf != NULL) {