vol_id: add --offset option

[elogind.git] / extras / volume_id / lib / squashfs.c

diff --git a/extras/volume_id/lib/squashfs.c b/extras/volume_id/lib/squashfs.c
index 99cc78aa415b6453e01e5c87f387bdd8719d2b58..035d6fb22a2b905f3abbe28dc7f4fc130db99c31 100644 (file)
--- a/extras/volume_id/lib/squashfs.c
+++ b/extras/volume_id/lib/squashfs.c
@@ -27,9 +27,18 @@
 #include "util.h"
 
 #define SQUASHFS_MAGIC         0x73717368
+#define SQUASHFS_MAGIC_LZMA    0x71736873
 
 struct squashfs_super {
-       uint32_t                s_magic;
+       uint32_t        s_magic;
+       uint32_t        inodes;
+       uint32_t        bytes_used_2;
+       uint32_t        uid_start_2;
+       uint32_t        guid_start_2;
+       uint32_t        inode_table_start_2;
+       uint32_t        directory_table_start_2;
+       uint16_t        s_major;
+       uint16_t        s_minor;
 } PACKED;
 
 int volume_id_probe_squashfs(struct volume_id *id, uint64_t off, uint64_t size)
@@ -38,15 +47,25 @@ int volume_id_probe_squashfs(struct volume_id *id, uint64_t off, uint64_t size)
 
        info("probing at offset 0x%llx", (unsigned long long) off);
 
-       sqs = (struct squashfs_super *) volume_id_get_buffer(id, off + 0x200, 0x200);
+       sqs = (struct squashfs_super *) volume_id_get_buffer(id, off, 0x200);
        if (sqs == NULL)
                return -1;
 
-       if (sqs->s_magic == SQUASHFS_MAGIC || sqs->s_magic == bswap_32(SQUASHFS_MAGIC)) {
-               volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
-               id->type = "squashfs";
-               return 0;
+       if (sqs->s_magic == SQUASHFS_MAGIC || sqs->s_magic == SQUASHFS_MAGIC_LZMA) {
+               snprintf(id->type_version, sizeof(id->type_version), "%u.%u",
+                        sqs->s_major, sqs->s_minor);
+               goto found;
+       }
+       if (sqs->s_magic == bswap_32(SQUASHFS_MAGIC) || sqs->s_magic == bswap_32(SQUASHFS_MAGIC_LZMA)) {
+               snprintf(id->type_version, sizeof(id->type_version), "%u.%u",
+                        bswap_16(sqs->s_major), bswap_16(sqs->s_minor));
+               goto found;
        }
 
        return -1;
+
+found:
+       volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+       id->type = "squashfs";
+       return 0;
 }