diff options
Diffstat (limited to 'libblkid/src/superblocks/squashfs.c')
| -rw-r--r-- | libblkid/src/superblocks/squashfs.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/libblkid/src/superblocks/squashfs.c b/libblkid/src/superblocks/squashfs.c new file mode 100644 index 0000000..92ab77a --- /dev/null +++ b/libblkid/src/superblocks/squashfs.c @@ -0,0 +1,121 @@ +/* + * Copyright (C) 2008 Karel Zak <kzak@redhat.com> + * + * Inspired by libvolume_id by + * Kay Sievers <kay.sievers@vrfy.org> + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + */ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <stdint.h> + +#include "bitops.h" /* swab16() */ +#include "superblocks.h" + +struct sqsh_super_block { + uint32_t magic; + uint32_t inode_count; + uint32_t mod_time; + uint32_t block_size; + uint32_t frag_count; + uint16_t compressor; + uint16_t block_log; + uint16_t flags; + uint16_t id_count; + uint16_t version_major; + uint16_t version_minor; + uint64_t root_inode; + uint64_t bytes_used; + uint64_t id_table; + uint64_t xattr_table; + uint64_t inode_table; + uint64_t dir_table; + uint64_t frag_table; + uint64_t export_table; +} __attribute__((packed)); + +static int probe_squashfs(blkid_probe pr, const struct blkid_idmag *mag) +{ + struct sqsh_super_block *sq; + uint16_t vermaj; + uint16_t vermin; + + sq = blkid_probe_get_sb(pr, mag, struct sqsh_super_block); + if (!sq) + return errno ? -errno : 1; + + vermaj = le16_to_cpu(sq->version_major); + vermin = le16_to_cpu(sq->version_minor); + if (vermaj < 4) + return 1; + + blkid_probe_sprintf_version(pr, "%u.%u", vermaj, vermin); + blkid_probe_set_fsblocksize(pr, le32_to_cpu(sq->block_size)); + blkid_probe_set_block_size(pr, le32_to_cpu(sq->block_size)); + blkid_probe_set_fssize(pr, le64_to_cpu(sq->bytes_used)); + + return 0; +} + +static int probe_squashfs3(blkid_probe pr, const struct blkid_idmag *mag) +{ + struct sqsh_super_block *sq; + uint16_t vermaj; + uint16_t vermin; + enum BLKID_ENDIANNESS endianness; + + sq = blkid_probe_get_sb(pr, mag, struct sqsh_super_block); + if (!sq) + return errno ? -errno : 1; + + if (strcmp(mag->magic, "sqsh") == 0) { + vermaj = be16_to_cpu(sq->version_major); + vermin = be16_to_cpu(sq->version_minor); + endianness = BLKID_ENDIANNESS_BIG; + } else { + vermaj = le16_to_cpu(sq->version_major); + vermin = le16_to_cpu(sq->version_minor); + endianness = BLKID_ENDIANNESS_LITTLE; + } + + if (vermaj > 3) + return 1; + + blkid_probe_sprintf_version(pr, "%u.%u", vermaj, vermin); + + blkid_probe_set_fsblocksize(pr, 1024); + blkid_probe_set_block_size(pr, 1024); + blkid_probe_set_fsendianness(pr, endianness); + + return 0; +} + +const struct blkid_idinfo squashfs_idinfo = +{ + .name = "squashfs", + .usage = BLKID_USAGE_FILESYSTEM, + .probefunc = probe_squashfs, + .magics = + { + { .magic = "hsqs", .len = 4 }, + { NULL } + } +}; + +const struct blkid_idinfo squashfs3_idinfo = +{ + .name = "squashfs3", + .usage = BLKID_USAGE_FILESYSTEM, + .probefunc = probe_squashfs3, + .magics = + { + { .magic = "sqsh", .len = 4 }, /* big endian */ + { .magic = "hsqs", .len = 4 }, /* little endian */ + { NULL } + } +}; + |