1/* 2 * volume_id - reads filesystem label and uuid 3 * 4 * Copyright (C) 2006 Kay Sievers <kay.sievers@vrfy.org> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation version 2 of the License. 9 */ 10 11#ifndef _GNU_SOURCE 12#define _GNU_SOURCE 1 13#endif 14 15#ifdef HAVE_CONFIG_H 16# include <config.h> 17#endif 18 19#include <stdio.h> 20#include <stdlib.h> 21#include <unistd.h> 22#include <string.h> 23#include <errno.h> 24#include <ctype.h> 25 26#include "libvolume_id.h" 27#include "util.h" 28 29#define SQUASHFS_MAGIC 0x73717368 30 31struct squashfs_super { 32 uint32_t s_magic; 33} PACKED; 34 35int volume_id_probe_squashfs(struct volume_id *id, uint64_t off, uint64_t size) 36{ 37 struct squashfs_super *sqs; 38 39 info("probing at offset 0x%llx", (unsigned long long) off); 40 41 sqs = (struct squashfs_super *) volume_id_get_buffer(id, off + 0x200, 0x200); 42 if (sqs == NULL) 43 return -1; 44 45 if (sqs->s_magic == SQUASHFS_MAGIC || sqs->s_magic == bswap_32(SQUASHFS_MAGIC)) { 46 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); 47 id->type = "squashfs"; 48 return 0; 49 } 50 51 return -1; 52} 53