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
37 #include <asm/types.h>
39 #include "volume_id.h"
43 void volume_id_set_unicode16(char *str, unsigned int len, const __u8 *buf, enum endian endianess, unsigned int count)
49 for (i = 0; i + 2 <= count; i += 2) {
51 c = (buf[i+1] << 8) | buf[i];
53 c = (buf[i] << 8) | buf[i+1];
57 } else if (c < 0x80) {
61 } else if (c < 0x800) {
64 str[j++] = (__u8) (0xc0 | (c >> 6));
65 str[j++] = (__u8) (0x80 | (c & 0x3f));
69 str[j++] = (__u8) (0xe0 | (c >> 12));
70 str[j++] = (__u8) (0x80 | ((c >> 6) & 0x3f));
71 str[j++] = (__u8) (0x80 | (c & 0x3f));
77 static char *usage_to_string(enum volume_id_usage usage_id)
80 case VOLUME_ID_FILESYSTEM:
82 case VOLUME_ID_PARTITIONTABLE:
83 return "partitiontable";
88 case VOLUME_ID_DISKLABEL:
90 case VOLUME_ID_CRYPTO:
92 case VOLUME_ID_UNPROBED:
94 case VOLUME_ID_UNUSED:
100 void volume_id_set_usage_part(struct volume_id_partition *part, enum volume_id_usage usage_id)
102 part->usage_id = usage_id;
103 part->usage = usage_to_string(usage_id);
106 void volume_id_set_usage(struct volume_id *id, enum volume_id_usage usage_id)
108 id->usage_id = usage_id;
109 id->usage = usage_to_string(usage_id);
112 void volume_id_set_label_raw(struct volume_id *id, const __u8 *buf, unsigned int count)
114 memcpy(id->label_raw, buf, count);
115 id->label_raw_len = count;
118 void volume_id_set_label_string(struct volume_id *id, const __u8 *buf, unsigned int count)
122 memcpy(id->label, buf, count);
124 /* remove trailing whitespace */
125 i = strnlen(id->label, count);
127 if (!isspace(id->label[i]))
130 id->label[i+1] = '\0';
133 void volume_id_set_label_unicode16(struct volume_id *id, const __u8 *buf, enum endian endianess, unsigned int count)
135 volume_id_set_unicode16(id->label, sizeof(id->label), buf, endianess, count);
138 void volume_id_set_uuid(struct volume_id *id, const __u8 *buf, enum uuid_format format)
141 unsigned int count = 0;
154 case UUID_DCE_STRING:
158 memcpy(id->uuid_raw, buf, count);
159 id->uuid_raw_len = count;
161 /* if set, create string in the same format, the native platform uses */
162 for (i = 0; i < count; i++)
170 sprintf(id->uuid, "%02X%02X-%02X%02X",
171 buf[3], buf[2], buf[1], buf[0]);
174 sprintf(id->uuid,"%02X%02X%02X%02X%02X%02X%02X%02X",
175 buf[7], buf[6], buf[5], buf[4],
176 buf[3], buf[2], buf[1], buf[0]);
179 sprintf(id->uuid,"%02X%02X%02X%02X%02X%02X%02X%02X",
180 buf[0], buf[1], buf[2], buf[3],
181 buf[4], buf[5], buf[6], buf[7]);
185 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
186 buf[0], buf[1], buf[2], buf[3],
190 buf[10], buf[11], buf[12], buf[13], buf[14],buf[15]);
192 case UUID_DCE_STRING:
193 memcpy(id->uuid, buf, count);
194 id->uuid[count] = '\0';
199 __u8 *volume_id_get_buffer(struct volume_id *id, __u64 off, unsigned int len)
201 unsigned int buf_len;
203 dbg("get buffer off 0x%llx(%llu), len 0x%x", (unsigned long long) off, (unsigned long long) off, len);
204 /* check if requested area fits in superblock buffer */
205 if (off + len <= SB_BUFFER_SIZE) {
206 if (id->sbbuf == NULL) {
207 id->sbbuf = malloc(SB_BUFFER_SIZE);
208 if (id->sbbuf == NULL)
212 /* check if we need to read */
213 if ((off + len) > id->sbbuf_len) {
214 dbg("read sbbuf len:0x%llx", (unsigned long long) (off + len));
215 lseek(id->fd, 0, SEEK_SET);
216 buf_len = read(id->fd, id->sbbuf, off + len);
217 dbg("got 0x%x (%i) bytes", buf_len, buf_len);
218 id->sbbuf_len = buf_len;
219 if (buf_len < off + len)
223 return &(id->sbbuf[off]);
225 if (len > SEEK_BUFFER_SIZE) {
226 dbg("seek buffer too small %d", SEEK_BUFFER_SIZE);
230 /* get seek buffer */
231 if (id->seekbuf == NULL) {
232 id->seekbuf = malloc(SEEK_BUFFER_SIZE);
233 if (id->seekbuf == NULL)
237 /* check if we need to read */
238 if ((off < id->seekbuf_off) || ((off + len) > (id->seekbuf_off + id->seekbuf_len))) {
239 dbg("read seekbuf off:0x%llx len:0x%x", (unsigned long long) off, len);
240 if (lseek(id->fd, off, SEEK_SET) == -1)
242 buf_len = read(id->fd, id->seekbuf, len);
243 dbg("got 0x%x (%i) bytes", buf_len, buf_len);
244 id->seekbuf_off = off;
245 id->seekbuf_len = buf_len;
247 dbg("requested 0x%x bytes, got only 0x%x bytes", len, buf_len);
252 return &(id->seekbuf[off - id->seekbuf_off]);
256 void volume_id_free_buffer(struct volume_id *id)
258 if (id->sbbuf != NULL) {
263 if (id->seekbuf != NULL) {