2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2006 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 #include "libvolume_id.h"
32 #include "libvolume_id-private.h"
34 #define SQUASHFS_MAGIC 0x73717368
35 #define SQUASHFS_MAGIC_LZMA 0x71736873
37 struct squashfs_super {
40 uint32_t bytes_used_2;
42 uint32_t guid_start_2;
43 uint32_t inode_table_start_2;
44 uint32_t directory_table_start_2;
49 int volume_id_probe_squashfs(struct volume_id *id, uint64_t off, uint64_t size)
51 struct squashfs_super *sqs;
53 info("probing at offset 0x%" PRIx64 "\n", off);
55 sqs = (struct squashfs_super *) volume_id_get_buffer(id, off, 0x200);
59 if (sqs->s_magic == SQUASHFS_MAGIC || sqs->s_magic == SQUASHFS_MAGIC_LZMA) {
60 snprintf(id->type_version, sizeof(id->type_version), "%u.%u",
61 sqs->s_major, sqs->s_minor);
64 if (sqs->s_magic == bswap_32(SQUASHFS_MAGIC) || sqs->s_magic == bswap_32(SQUASHFS_MAGIC_LZMA)) {
65 snprintf(id->type_version, sizeof(id->type_version), "%u.%u",
66 bswap_16(sqs->s_major), bswap_16(sqs->s_minor));
73 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
74 id->type = "squashfs";