[people/ms/u-boot.git] / fs / cramfs / cramfs.c

/*
 * cramfs.c
 *
 * Copyright (C) 1999 Linus Torvalds
 *
 * Copyright (C) 2000-2002 Transmeta Corporation
 *
 * Copyright (C) 2003 Kai-Uwe Bloem,
 * Auerswald GmbH & Co KG, <linux-development@auerswald.de>
 * - adapted from the www.tuxbox.org u-boot tree, added "ls" command
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (Version 2) as
 * published by the Free Software Foundation.
 *
 * Compressed ROM filesystem for Linux.
 *
 * TODO:
 * add support for resolving symbolic links
 */

/*
 * These are the VFS interfaces to the compressed ROM filesystem.
 * The actual compression is based on zlib, see the other files.
 */

#include <common.h>
#include <malloc.h>
#include <asm/byteorder.h>
#include <linux/stat.h>
#include <jffs2/jffs2.h>
#include <jffs2/load_kernel.h>
#include <cramfs/cramfs_fs.h>

/* These two macros may change in future, to provide better st_ino
   semantics. */
#define CRAMINO(x)	(CRAMFS_GET_OFFSET(x) ? CRAMFS_GET_OFFSET(x)<<2 : 1)
#define OFFSET(x)	((x)->i_ino)

struct cramfs_super super;

/* CPU address space offset calculation macro, struct part_info offset is
 * device address space offset, so we need to shift it by a device start address. */
#if defined(CONFIG_MTD_NOR_FLASH)
extern flash_info_t flash_info[];
#define PART_OFFSET(x)	((ulong)x->offset + \
			 flash_info[x->dev->id->num].start[0])
#else
#define PART_OFFSET(x)	((ulong)x->offset)
#endif

static int cramfs_read_super (struct part_info *info)
{
	unsigned long root_offset;

	/* Read the first block and get the superblock from it */
	memcpy (&super, (void *) PART_OFFSET(info), sizeof (super));

	/* Do sanity checks on the superblock */
	if (super.magic != CRAMFS_32 (CRAMFS_MAGIC)) {
		/* check at 512 byte offset */
		memcpy (&super, (void *) PART_OFFSET(info) + 512, sizeof (super));
		if (super.magic != CRAMFS_32 (CRAMFS_MAGIC)) {
			printf ("cramfs: wrong magic\n");
			return -1;
		}
	}

	/* flags is reused several times, so swab it once */
	super.flags = CRAMFS_32 (super.flags);
	super.size = CRAMFS_32 (super.size);

	/* get feature flags first */
	if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
		printf ("cramfs: unsupported filesystem features\n");
		return -1;
	}

	/* Check that the root inode is in a sane state */
	if (!S_ISDIR (CRAMFS_16 (super.root.mode))) {
		printf ("cramfs: root is not a directory\n");
		return -1;
	}
	root_offset = CRAMFS_GET_OFFSET (&(super.root)) << 2;
	if (root_offset == 0) {
		printf ("cramfs: empty filesystem");
	} else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
		   ((root_offset != sizeof (struct cramfs_super)) &&
		    (root_offset != 512 + sizeof (struct cramfs_super)))) {
		printf ("cramfs: bad root offset %lu\n", root_offset);
		return -1;
	}

	return 0;
}

static unsigned long cramfs_resolve (unsigned long begin, unsigned long offset,
				     unsigned long size, int raw,
				     char *filename)
{
	unsigned long inodeoffset = 0, nextoffset;

	while (inodeoffset < size) {
		struct cramfs_inode *inode;
		char *name;
		int namelen;

		inode = (struct cramfs_inode *) (begin + offset +
						 inodeoffset);

		/*
		 * Namelengths on disk are shifted by two
		 * and the name padded out to 4-byte boundaries
		 * with zeroes.
		 */
		namelen = CRAMFS_GET_NAMELEN (inode) << 2;
		name = (char *) inode + sizeof (struct cramfs_inode);

		nextoffset =
			inodeoffset + sizeof (struct cramfs_inode) + namelen;

		for (;;) {
			if (!namelen)
				return -1;
			if (name[namelen - 1])
				break;
			namelen--;
		}

		if (!strncmp(filename, name, namelen) &&
		    (namelen == strlen(filename))) {
			char *p = strtok (NULL, "/");

			if (raw && (p == NULL || *p == '\0'))
				return offset + inodeoffset;

			if (S_ISDIR (CRAMFS_16 (inode->mode))) {
				return cramfs_resolve (begin,
						       CRAMFS_GET_OFFSET
						       (inode) << 2,
						       CRAMFS_24 (inode->
								  size), raw,
						       p);
			} else if (S_ISREG (CRAMFS_16 (inode->mode))) {
				return offset + inodeoffset;
			} else {
				printf ("%*.*s: unsupported file type (%x)\n",
					namelen, namelen, name,
					CRAMFS_16 (inode->mode));
				return 0;
			}
		}

		inodeoffset = nextoffset;
	}

	printf ("can't find corresponding entry\n");
	return 0;
}

static int cramfs_uncompress (unsigned long begin, unsigned long offset,
			      unsigned long loadoffset)
{
	struct cramfs_inode *inode = (struct cramfs_inode *) (begin + offset);
	unsigned long *block_ptrs = (unsigned long *)
		(begin + (CRAMFS_GET_OFFSET (inode) << 2));
	unsigned long curr_block = (CRAMFS_GET_OFFSET (inode) +
				    (((CRAMFS_24 (inode->size)) +
				      4095) >> 12)) << 2;
	int size, total_size = 0;
	int i;

	cramfs_uncompress_init ();

	for (i = 0; i < ((CRAMFS_24 (inode->size) + 4095) >> 12); i++) {
		size = cramfs_uncompress_block ((void *) loadoffset,
						(void *) (begin + curr_block),
						(CRAMFS_32 (block_ptrs[i]) -
						 curr_block));
		if (size < 0)
			return size;
		loadoffset += size;
		total_size += size;
		curr_block = CRAMFS_32 (block_ptrs[i]);
	}

	cramfs_uncompress_exit ();
	return total_size;
}

int cramfs_load (char *loadoffset, struct part_info *info, char *filename)
{
	unsigned long offset;

	if (cramfs_read_super (info))
		return -1;

	offset = cramfs_resolve (PART_OFFSET(info),
				 CRAMFS_GET_OFFSET (&(super.root)) << 2,
				 CRAMFS_24 (super.root.size), 0,
				 strtok (filename, "/"));

	if (offset <= 0)
		return offset;

	return cramfs_uncompress (PART_OFFSET(info), offset,
				  (unsigned long) loadoffset);
}

static int cramfs_list_inode (struct part_info *info, unsigned long offset)
{
	struct cramfs_inode *inode = (struct cramfs_inode *)
		(PART_OFFSET(info) + offset);
	char *name, str[20];
	int namelen, nextoff;

	/*
	 * Namelengths on disk are shifted by two
	 * and the name padded out to 4-byte boundaries
	 * with zeroes.
	 */
	namelen = CRAMFS_GET_NAMELEN (inode) << 2;
	name = (char *) inode + sizeof (struct cramfs_inode);
	nextoff = namelen;

	for (;;) {
		if (!namelen)
			return namelen;
		if (name[namelen - 1])
			break;
		namelen--;
	}

	printf (" %s %8d %*.*s", mkmodestr (CRAMFS_16 (inode->mode), str),
		CRAMFS_24 (inode->size), namelen, namelen, name);

	if ((CRAMFS_16 (inode->mode) & S_IFMT) == S_IFLNK) {
		/* symbolic link.
		 * Unpack the link target, trusting in the inode's size field.
		 */
		unsigned long size = CRAMFS_24 (inode->size);
		char *link = malloc (size);

		if (link != NULL && cramfs_uncompress (PART_OFFSET(info), offset,
						       (unsigned long) link)
		    == size)
			printf (" -> %*.*s\n", (int) size, (int) size, link);
		else
			printf (" [Error reading link]\n");
		if (link)
			free (link);
	} else
		printf ("\n");

	return nextoff;
}

int cramfs_ls (struct part_info *info, char *filename)
{
	struct cramfs_inode *inode;
	unsigned long inodeoffset = 0, nextoffset;
	unsigned long offset, size;

	if (cramfs_read_super (info))
		return -1;

	if (strlen (filename) == 0 || !strcmp (filename, "/")) {
		/* Root directory. Use root inode in super block */
		offset = CRAMFS_GET_OFFSET (&(super.root)) << 2;
		size = CRAMFS_24 (super.root.size);
	} else {
		/* Resolve the path */
		offset = cramfs_resolve (PART_OFFSET(info),
					 CRAMFS_GET_OFFSET (&(super.root)) <<
					 2, CRAMFS_24 (super.root.size), 1,
					 strtok (filename, "/"));

		if (offset <= 0)
			return offset;

		/* Resolving was successful. Examine the inode */
		inode = (struct cramfs_inode *) (PART_OFFSET(info) + offset);
		if (!S_ISDIR (CRAMFS_16 (inode->mode))) {
			/* It's not a directory - list it, and that's that */
			return (cramfs_list_inode (info, offset) > 0);
		}

		/* It's a directory. List files within */
		offset = CRAMFS_GET_OFFSET (inode) << 2;
		size = CRAMFS_24 (inode->size);
	}

	/* List the given directory */
	while (inodeoffset < size) {
		inode = (struct cramfs_inode *) (PART_OFFSET(info) + offset +
						 inodeoffset);

		nextoffset = cramfs_list_inode (info, offset + inodeoffset);
		if (nextoffset == 0)
			break;
		inodeoffset += sizeof (struct cramfs_inode) + nextoffset;
	}

	return 1;
}

int cramfs_info (struct part_info *info)
{
	if (cramfs_read_super (info))
		return 0;

	printf ("size: 0x%x (%u)\n", super.size, super.size);

	if (super.flags != 0) {
		printf ("flags:\n");
		if (super.flags & CRAMFS_FLAG_FSID_VERSION_2)
			printf ("\tFSID version 2\n");
		if (super.flags & CRAMFS_FLAG_SORTED_DIRS)
			printf ("\tsorted dirs\n");
		if (super.flags & CRAMFS_FLAG_HOLES)
			printf ("\tholes\n");
		if (super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET)
			printf ("\tshifted root offset\n");
	}

	printf ("fsid:\n\tcrc: 0x%x\n\tedition: 0x%x\n",
		super.fsid.crc, super.fsid.edition);
	printf ("name: %16s\n", super.name);

	return 1;
}

int cramfs_check (struct part_info *info)
{
	struct cramfs_super *sb;

	if (info->dev->id->type != MTD_DEV_TYPE_NOR)
		return 0;

	sb = (struct cramfs_super *) PART_OFFSET(info);
	if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC)) {
		/* check at 512 byte offset */
		sb = (struct cramfs_super *) (PART_OFFSET(info) + 512);
		if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC))
			return 0;
	}
	return 1;
}
Commit	Line	Data
dd875c76 WD	1	/*
	2	* cramfs.c
	3	*
	4	* Copyright (C) 1999 Linus Torvalds
	5	*
	6	* Copyright (C) 2000-2002 Transmeta Corporation
	7	*
	8	* Copyright (C) 2003 Kai-Uwe Bloem,
	9	* Auerswald GmbH & Co KG, <linux-development@auerswald.de>
	10	* - adapted from the www.tuxbox.org u-boot tree, added "ls" command
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License (Version 2) as
	14	* published by the Free Software Foundation.
	15	*
	16	* Compressed ROM filesystem for Linux.
	17	*
	18	* TODO:
	19	* add support for resolving symbolic links
	20	*/
	21
	22	/*
	23	* These are the VFS interfaces to the compressed ROM filesystem.
	24	* The actual compression is based on zlib, see the other files.
	25	*/
	26
	27	#include <common.h>
	28	#include <malloc.h>
dd875c76 WD	29	#include <asm/byteorder.h>
dd875c76 WD	30	#include <linux/stat.h>
180d3f74	31	#include <jffs2/jffs2.h>
dd875c76	32	#include <jffs2/load_kernel.h>
180d3f74	33	#include <cramfs/cramfs_fs.h>
dd875c76 WD	34
	35	/* These two macros may change in future, to provide better st_ino
	36	semantics. */
	37	#define CRAMINO(x) (CRAMFS_GET_OFFSET(x) ? CRAMFS_GET_OFFSET(x)<<2 : 1)
	38	#define OFFSET(x) ((x)->i_ino)
	39
	40	struct cramfs_super super;
	41
700a0c64 WD	42	/* CPU address space offset calculation macro, struct part_info offset is
700a0c64 WD	43	* device address space offset, so we need to shift it by a device start address. */
e856bdcf	44	#if defined(CONFIG_MTD_NOR_FLASH)
e6f2e902	45	extern flash_info_t flash_info[];
06503f16 SW	46	#define PART_OFFSET(x) ((ulong)x->offset + \
06503f16 SW	47	flash_info[x->dev->id->num].start[0])
62a813bc	48	#else
06503f16	49	#define PART_OFFSET(x) ((ulong)x->offset)
62a813bc	50	#endif
700a0c64	51
dd875c76 WD	52	static int cramfs_read_super (struct part_info *info)
	53	{
	54	unsigned long root_offset;
	55
	56	/* Read the first block and get the superblock from it */
700a0c64	57	memcpy (&super, (void *) PART_OFFSET(info), sizeof (super));
dd875c76 WD	58
	59	/* Do sanity checks on the superblock */
	60	if (super.magic != CRAMFS_32 (CRAMFS_MAGIC)) {
	61	/* check at 512 byte offset */
700a0c64	62	memcpy (&super, (void *) PART_OFFSET(info) + 512, sizeof (super));
dd875c76 WD	63	if (super.magic != CRAMFS_32 (CRAMFS_MAGIC)) {
	64	printf ("cramfs: wrong magic\n");
	65	return -1;
	66	}
	67	}
	68
	69	/* flags is reused several times, so swab it once */
	70	super.flags = CRAMFS_32 (super.flags);
	71	super.size = CRAMFS_32 (super.size);
	72
	73	/* get feature flags first */
	74	if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
	75	printf ("cramfs: unsupported filesystem features\n");
	76	return -1;
	77	}
	78
	79	/* Check that the root inode is in a sane state */
	80	if (!S_ISDIR (CRAMFS_16 (super.root.mode))) {
	81	printf ("cramfs: root is not a directory\n");
	82	return -1;
	83	}
	84	root_offset = CRAMFS_GET_OFFSET (&(super.root)) << 2;
	85	if (root_offset == 0) {
	86	printf ("cramfs: empty filesystem");
	87	} else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
	88	((root_offset != sizeof (struct cramfs_super)) &&
	89	(root_offset != 512 + sizeof (struct cramfs_super)))) {
	90	printf ("cramfs: bad root offset %lu\n", root_offset);
	91	return -1;
	92	}
	93
	94	return 0;
	95	}
	96
700a0c64	97	static unsigned long cramfs_resolve (unsigned long begin, unsigned long offset,
dd875c76 WD	98	unsigned long size, int raw,
	99	char *filename)
	100	{
	101	unsigned long inodeoffset = 0, nextoffset;
	102
	103	while (inodeoffset < size) {
	104	struct cramfs_inode *inode;
	105	char *name;
	106	int namelen;
	107
	108	inode = (struct cramfs_inode *) (begin + offset +
	109	inodeoffset);
	110
	111	/*
	112	* Namelengths on disk are shifted by two
	113	* and the name padded out to 4-byte boundaries
	114	* with zeroes.
	115	*/
	116	namelen = CRAMFS_GET_NAMELEN (inode) << 2;
	117	name = (char *) inode + sizeof (struct cramfs_inode);
	118
	119	nextoffset =
	120	inodeoffset + sizeof (struct cramfs_inode) + namelen;
	121
	122	for (;;) {
	123	if (!namelen)
	124	return -1;
	125	if (name[namelen - 1])
	126	break;
	127	namelen--;
	128	}
	129
457dd025 HB	130	if (!strncmp(filename, name, namelen) &&
457dd025 HB	131	(namelen == strlen(filename))) {
dd875c76 WD	132	char *p = strtok (NULL, "/");
	133
	134	if (raw && (p == NULL \|\| *p == '\0'))
	135	return offset + inodeoffset;
	136
	137	if (S_ISDIR (CRAMFS_16 (inode->mode))) {
	138	return cramfs_resolve (begin,
	139	CRAMFS_GET_OFFSET
	140	(inode) << 2,
	141	CRAMFS_24 (inode->
	142	size), raw,
	143	p);
	144	} else if (S_ISREG (CRAMFS_16 (inode->mode))) {
	145	return offset + inodeoffset;
	146	} else {
	147	printf ("%.s: unsupported file type (%x)\n",
	148	namelen, namelen, name,
	149	CRAMFS_16 (inode->mode));
	150	return 0;
	151	}
	152	}
	153
	154	inodeoffset = nextoffset;
	155	}
	156
	157	printf ("can't find corresponding entry\n");
	158	return 0;
	159	}
	160
700a0c64	161	static int cramfs_uncompress (unsigned long begin, unsigned long offset,
dd875c76 WD	162	unsigned long loadoffset)
	163	{
	164	struct cramfs_inode inode = (struct cramfs_inode ) (begin + offset);
	165	unsigned long block_ptrs = (unsigned long )
	166	(begin + (CRAMFS_GET_OFFSET (inode) << 2));
	167	unsigned long curr_block = (CRAMFS_GET_OFFSET (inode) +
	168	(((CRAMFS_24 (inode->size)) +
	169	4095) >> 12)) << 2;
	170	int size, total_size = 0;
	171	int i;
	172
	173	cramfs_uncompress_init ();
	174
	175	for (i = 0; i < ((CRAMFS_24 (inode->size) + 4095) >> 12); i++) {
	176	size = cramfs_uncompress_block ((void *) loadoffset,
	177	(void *) (begin + curr_block),
	178	(CRAMFS_32 (block_ptrs[i]) -
	179	curr_block));
	180	if (size < 0)
	181	return size;
	182	loadoffset += size;
	183	total_size += size;
	184	curr_block = CRAMFS_32 (block_ptrs[i]);
	185	}
	186
	187	cramfs_uncompress_exit ();
	188	return total_size;
	189	}
	190
	191	int cramfs_load (char loadoffset, struct part_info info, char *filename)
	192	{
	193	unsigned long offset;
	194
	195	if (cramfs_read_super (info))
	196	return -1;
	197
700a0c64	198	offset = cramfs_resolve (PART_OFFSET(info),
dd875c76 WD	199	CRAMFS_GET_OFFSET (&(super.root)) << 2,
	200	CRAMFS_24 (super.root.size), 0,
	201	strtok (filename, "/"));
	202
	203	if (offset <= 0)
	204	return offset;
	205
700a0c64	206	return cramfs_uncompress (PART_OFFSET(info), offset,
dd875c76 WD	207	(unsigned long) loadoffset);
	208	}
	209
dd875c76 WD	210	static int cramfs_list_inode (struct part_info *info, unsigned long offset)
	211	{
	212	struct cramfs_inode inode = (struct cramfs_inode )
700a0c64	213	(PART_OFFSET(info) + offset);
dd875c76 WD	214	char *name, str[20];
	215	int namelen, nextoff;
	216
	217	/*
	218	* Namelengths on disk are shifted by two
	219	* and the name padded out to 4-byte boundaries
	220	* with zeroes.
	221	*/
	222	namelen = CRAMFS_GET_NAMELEN (inode) << 2;
	223	name = (char *) inode + sizeof (struct cramfs_inode);
	224	nextoff = namelen;
	225
	226	for (;;) {
	227	if (!namelen)
	228	return namelen;
	229	if (name[namelen - 1])
	230	break;
	231	namelen--;
	232	}
	233
	234	printf (" %s %8d %.s", mkmodestr (CRAMFS_16 (inode->mode), str),
	235	CRAMFS_24 (inode->size), namelen, namelen, name);
	236
	237	if ((CRAMFS_16 (inode->mode) & S_IFMT) == S_IFLNK) {
	238	/* symbolic link.
	239	* Unpack the link target, trusting in the inode's size field.
	240	*/
	241	unsigned long size = CRAMFS_24 (inode->size);
	242	char *link = malloc (size);
	243
700a0c64	244	if (link != NULL && cramfs_uncompress (PART_OFFSET(info), offset,
dd875c76 WD	245	(unsigned long) link)
	246	== size)
	247	printf (" -> %.s\n", (int) size, (int) size, link);
	248	else
	249	printf (" [Error reading link]\n");
	250	if (link)
	251	free (link);
	252	} else
	253	printf ("\n");
	254
	255	return nextoff;
	256	}
	257
	258	int cramfs_ls (struct part_info info, char filename)
	259	{
	260	struct cramfs_inode *inode;
	261	unsigned long inodeoffset = 0, nextoffset;
	262	unsigned long offset, size;
	263
	264	if (cramfs_read_super (info))
	265	return -1;
	266
	267	if (strlen (filename) == 0 \|\| !strcmp (filename, "/")) {
	268	/* Root directory. Use root inode in super block */
	269	offset = CRAMFS_GET_OFFSET (&(super.root)) << 2;
	270	size = CRAMFS_24 (super.root.size);
	271	} else {
	272	/* Resolve the path */
700a0c64	273	offset = cramfs_resolve (PART_OFFSET(info),
dd875c76 WD	274	CRAMFS_GET_OFFSET (&(super.root)) <<
	275	2, CRAMFS_24 (super.root.size), 1,
	276	strtok (filename, "/"));
	277
	278	if (offset <= 0)
	279	return offset;
	280
	281	/* Resolving was successful. Examine the inode */
700a0c64	282	inode = (struct cramfs_inode *) (PART_OFFSET(info) + offset);
dd875c76 WD	283	if (!S_ISDIR (CRAMFS_16 (inode->mode))) {
	284	/* It's not a directory - list it, and that's that */
	285	return (cramfs_list_inode (info, offset) > 0);
	286	}
	287
	288	/* It's a directory. List files within */
	289	offset = CRAMFS_GET_OFFSET (inode) << 2;
	290	size = CRAMFS_24 (inode->size);
	291	}
	292
	293	/* List the given directory */
	294	while (inodeoffset < size) {
700a0c64	295	inode = (struct cramfs_inode *) (PART_OFFSET(info) + offset +
dd875c76 WD	296	inodeoffset);
	297
	298	nextoffset = cramfs_list_inode (info, offset + inodeoffset);
	299	if (nextoffset == 0)
	300	break;
	301	inodeoffset += sizeof (struct cramfs_inode) + nextoffset;
	302	}
	303
	304	return 1;
	305	}
	306
	307	int cramfs_info (struct part_info *info)
	308	{
	309	if (cramfs_read_super (info))
	310	return 0;
	311
	312	printf ("size: 0x%x (%u)\n", super.size, super.size);
	313
	314	if (super.flags != 0) {
	315	printf ("flags:\n");
	316	if (super.flags & CRAMFS_FLAG_FSID_VERSION_2)
	317	printf ("\tFSID version 2\n");
	318	if (super.flags & CRAMFS_FLAG_SORTED_DIRS)
	319	printf ("\tsorted dirs\n");
	320	if (super.flags & CRAMFS_FLAG_HOLES)
	321	printf ("\tholes\n");
	322	if (super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET)
	323	printf ("\tshifted root offset\n");
	324	}
	325
	326	printf ("fsid:\n\tcrc: 0x%x\n\tedition: 0x%x\n",
	327	super.fsid.crc, super.fsid.edition);
	328	printf ("name: %16s\n", super.name);
	329
	330	return 1;
	331	}
	332
	333	int cramfs_check (struct part_info *info)
	334	{
700a0c64 WD	335	struct cramfs_super *sb;
	336
	337	if (info->dev->id->type != MTD_DEV_TYPE_NOR)
	338	return 0;
dd875c76	339
700a0c64	340	sb = (struct cramfs_super *) PART_OFFSET(info);
dd875c76 WD	341	if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC)) {
dd875c76 WD	342	/* check at 512 byte offset */
700a0c64 WD	343	sb = (struct cramfs_super *) (PART_OFFSET(info) + 512);
700a0c64 WD	344	if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC))
dd875c76	345	return 0;
dd875c76 WD	346	}
	347	return 1;
	348	}