[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_uncompress (unsigned long begin, unsigned long offset,
			      unsigned long loadoffset);

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;
}

/* Unpack to an allocated buffer, trusting in the inode's size field. */
static char *cramfs_uncompress_link (unsigned long begin, unsigned long offset)
{
	struct cramfs_inode *inode = (struct cramfs_inode *)(begin + offset);
	unsigned long size = CRAMFS_24 (inode->size);
	char *link = malloc (size + 1);

	if (!link || cramfs_uncompress (begin, offset, (unsigned long)link) != size) {
		free (link);
		link = NULL;
	} else {
		link[size] = '\0';
	}
	return link;
}

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 if (S_ISLNK (CRAMFS_16 (inode->mode))) {
				unsigned long ret;
				char *link;
				if (p && strlen(p)) {
					printf ("unsupported symlink to \
						 non-terminal path\n");
					return 0;
				}
				link = cramfs_uncompress_link (begin,
						offset + inodeoffset);
				if (!link) {
					printf ("%*.*s: Error reading link\n",
						namelen, namelen, name);
					return 0;
				} else if (link[0] == '/') {
					printf ("unsupported symlink to \
						 absolute path\n");
					free (link);
					return 0;
				}
				ret = cramfs_resolve (begin,
						      offset,
						      size,
						      raw,
						      strtok(link, "/"));
				free (link);
				return ret;
			} 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);
	u32 *block_ptrs = (u32 *)
		(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) {
		char *link = cramfs_uncompress_link (PART_OFFSET(info), offset);
		if (link)
			printf (" -> %s\n", link);
		else
			printf (" [Error reading link]\n");
		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
d39a0d2c TH	52	static int cramfs_uncompress (unsigned long begin, unsigned long offset,
	53	unsigned long loadoffset);
	54
dd875c76 WD	55	static int cramfs_read_super (struct part_info *info)
	56	{
	57	unsigned long root_offset;
	58
	59	/* Read the first block and get the superblock from it */
700a0c64	60	memcpy (&super, (void *) PART_OFFSET(info), sizeof (super));
dd875c76 WD	61
	62	/* Do sanity checks on the superblock */
	63	if (super.magic != CRAMFS_32 (CRAMFS_MAGIC)) {
	64	/* check at 512 byte offset */
700a0c64	65	memcpy (&super, (void *) PART_OFFSET(info) + 512, sizeof (super));
dd875c76 WD	66	if (super.magic != CRAMFS_32 (CRAMFS_MAGIC)) {
	67	printf ("cramfs: wrong magic\n");
	68	return -1;
	69	}
	70	}
	71
	72	/* flags is reused several times, so swab it once */
	73	super.flags = CRAMFS_32 (super.flags);
	74	super.size = CRAMFS_32 (super.size);
	75
	76	/* get feature flags first */
	77	if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
	78	printf ("cramfs: unsupported filesystem features\n");
	79	return -1;
	80	}
	81
	82	/* Check that the root inode is in a sane state */
	83	if (!S_ISDIR (CRAMFS_16 (super.root.mode))) {
	84	printf ("cramfs: root is not a directory\n");
	85	return -1;
	86	}
	87	root_offset = CRAMFS_GET_OFFSET (&(super.root)) << 2;
	88	if (root_offset == 0) {
	89	printf ("cramfs: empty filesystem");
	90	} else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
	91	((root_offset != sizeof (struct cramfs_super)) &&
	92	(root_offset != 512 + sizeof (struct cramfs_super)))) {
	93	printf ("cramfs: bad root offset %lu\n", root_offset);
	94	return -1;
	95	}
	96
	97	return 0;
	98	}
	99
d39a0d2c TH	100	/* Unpack to an allocated buffer, trusting in the inode's size field. */
	101	static char *cramfs_uncompress_link (unsigned long begin, unsigned long offset)
	102	{
	103	struct cramfs_inode inode = (struct cramfs_inode )(begin + offset);
	104	unsigned long size = CRAMFS_24 (inode->size);
	105	char *link = malloc (size + 1);
	106
	107	if (!link \|\| cramfs_uncompress (begin, offset, (unsigned long)link) != size) {
	108	free (link);
	109	link = NULL;
	110	} else {
	111	link[size] = '\0';
	112	}
	113	return link;
	114	}
	115
700a0c64	116	static unsigned long cramfs_resolve (unsigned long begin, unsigned long offset,
dd875c76 WD	117	unsigned long size, int raw,
	118	char *filename)
	119	{
	120	unsigned long inodeoffset = 0, nextoffset;
	121
	122	while (inodeoffset < size) {
	123	struct cramfs_inode *inode;
	124	char *name;
	125	int namelen;
	126
	127	inode = (struct cramfs_inode *) (begin + offset +
	128	inodeoffset);
	129
	130	/*
	131	* Namelengths on disk are shifted by two
	132	* and the name padded out to 4-byte boundaries
	133	* with zeroes.
	134	*/
	135	namelen = CRAMFS_GET_NAMELEN (inode) << 2;
	136	name = (char *) inode + sizeof (struct cramfs_inode);
	137
	138	nextoffset =
	139	inodeoffset + sizeof (struct cramfs_inode) + namelen;
	140
	141	for (;;) {
	142	if (!namelen)
	143	return -1;
	144	if (name[namelen - 1])
	145	break;
	146	namelen--;
	147	}
	148
457dd025 HB	149	if (!strncmp(filename, name, namelen) &&
457dd025 HB	150	(namelen == strlen(filename))) {
dd875c76 WD	151	char *p = strtok (NULL, "/");
	152
	153	if (raw && (p == NULL \|\| *p == '\0'))
	154	return offset + inodeoffset;
	155
	156	if (S_ISDIR (CRAMFS_16 (inode->mode))) {
	157	return cramfs_resolve (begin,
	158	CRAMFS_GET_OFFSET
	159	(inode) << 2,
	160	CRAMFS_24 (inode->
	161	size), raw,
	162	p);
	163	} else if (S_ISREG (CRAMFS_16 (inode->mode))) {
	164	return offset + inodeoffset;
d39a0d2c TH	165	} else if (S_ISLNK (CRAMFS_16 (inode->mode))) {
	166	unsigned long ret;
	167	char *link;
	168	if (p && strlen(p)) {
	169	printf ("unsupported symlink to \
	170	non-terminal path\n");
	171	return 0;
	172	}
	173	link = cramfs_uncompress_link (begin,
	174	offset + inodeoffset);
	175	if (!link) {
	176	printf ("%.s: Error reading link\n",
	177	namelen, namelen, name);
	178	return 0;
	179	} else if (link[0] == '/') {
	180	printf ("unsupported symlink to \
	181	absolute path\n");
	182	free (link);
	183	return 0;
	184	}
	185	ret = cramfs_resolve (begin,
	186	offset,
	187	size,
	188	raw,
	189	strtok(link, "/"));
	190	free (link);
	191	return ret;
dd875c76 WD	192	} else {
	193	printf ("%.s: unsupported file type (%x)\n",
	194	namelen, namelen, name,
	195	CRAMFS_16 (inode->mode));
	196	return 0;
	197	}
	198	}
	199
	200	inodeoffset = nextoffset;
	201	}
	202
	203	printf ("can't find corresponding entry\n");
	204	return 0;
	205	}
	206
700a0c64	207	static int cramfs_uncompress (unsigned long begin, unsigned long offset,
dd875c76 WD	208	unsigned long loadoffset)
	209	{
	210	struct cramfs_inode inode = (struct cramfs_inode ) (begin + offset);
a6ea791c	211	u32 block_ptrs = (u32 )
dd875c76 WD	212	(begin + (CRAMFS_GET_OFFSET (inode) << 2));
	213	unsigned long curr_block = (CRAMFS_GET_OFFSET (inode) +
	214	(((CRAMFS_24 (inode->size)) +
	215	4095) >> 12)) << 2;
	216	int size, total_size = 0;
	217	int i;
	218
	219	cramfs_uncompress_init ();
	220
	221	for (i = 0; i < ((CRAMFS_24 (inode->size) + 4095) >> 12); i++) {
	222	size = cramfs_uncompress_block ((void *) loadoffset,
	223	(void *) (begin + curr_block),
	224	(CRAMFS_32 (block_ptrs[i]) -
	225	curr_block));
	226	if (size < 0)
	227	return size;
	228	loadoffset += size;
	229	total_size += size;
	230	curr_block = CRAMFS_32 (block_ptrs[i]);
	231	}
	232
	233	cramfs_uncompress_exit ();
	234	return total_size;
	235	}
	236
	237	int cramfs_load (char loadoffset, struct part_info info, char *filename)
	238	{
	239	unsigned long offset;
	240
	241	if (cramfs_read_super (info))
	242	return -1;
	243
700a0c64	244	offset = cramfs_resolve (PART_OFFSET(info),
dd875c76 WD	245	CRAMFS_GET_OFFSET (&(super.root)) << 2,
	246	CRAMFS_24 (super.root.size), 0,
	247	strtok (filename, "/"));
	248
	249	if (offset <= 0)
	250	return offset;
	251
700a0c64	252	return cramfs_uncompress (PART_OFFSET(info), offset,
dd875c76 WD	253	(unsigned long) loadoffset);
	254	}
	255
dd875c76 WD	256	static int cramfs_list_inode (struct part_info *info, unsigned long offset)
	257	{
	258	struct cramfs_inode inode = (struct cramfs_inode )
700a0c64	259	(PART_OFFSET(info) + offset);
dd875c76 WD	260	char *name, str[20];
	261	int namelen, nextoff;
	262
	263	/*
	264	* Namelengths on disk are shifted by two
	265	* and the name padded out to 4-byte boundaries
	266	* with zeroes.
	267	*/
	268	namelen = CRAMFS_GET_NAMELEN (inode) << 2;
	269	name = (char *) inode + sizeof (struct cramfs_inode);
	270	nextoff = namelen;
	271
	272	for (;;) {
	273	if (!namelen)
	274	return namelen;
	275	if (name[namelen - 1])
	276	break;
	277	namelen--;
	278	}
	279
	280	printf (" %s %8d %.s", mkmodestr (CRAMFS_16 (inode->mode), str),
	281	CRAMFS_24 (inode->size), namelen, namelen, name);
	282
	283	if ((CRAMFS_16 (inode->mode) & S_IFMT) == S_IFLNK) {
d39a0d2c TH	284	char *link = cramfs_uncompress_link (PART_OFFSET(info), offset);
	285	if (link)
	286	printf (" -> %s\n", link);
dd875c76 WD	287	else
dd875c76 WD	288	printf (" [Error reading link]\n");
d39a0d2c	289	free (link);
dd875c76 WD	290	} else
	291	printf ("\n");
	292
	293	return nextoff;
	294	}
	295
	296	int cramfs_ls (struct part_info info, char filename)
	297	{
	298	struct cramfs_inode *inode;
	299	unsigned long inodeoffset = 0, nextoffset;
	300	unsigned long offset, size;
	301
	302	if (cramfs_read_super (info))
	303	return -1;
	304
	305	if (strlen (filename) == 0 \|\| !strcmp (filename, "/")) {
	306	/* Root directory. Use root inode in super block */
	307	offset = CRAMFS_GET_OFFSET (&(super.root)) << 2;
	308	size = CRAMFS_24 (super.root.size);
	309	} else {
	310	/* Resolve the path */
700a0c64	311	offset = cramfs_resolve (PART_OFFSET(info),
dd875c76 WD	312	CRAMFS_GET_OFFSET (&(super.root)) <<
	313	2, CRAMFS_24 (super.root.size), 1,
	314	strtok (filename, "/"));
	315
	316	if (offset <= 0)
	317	return offset;
	318
	319	/* Resolving was successful. Examine the inode */
700a0c64	320	inode = (struct cramfs_inode *) (PART_OFFSET(info) + offset);
dd875c76 WD	321	if (!S_ISDIR (CRAMFS_16 (inode->mode))) {
	322	/* It's not a directory - list it, and that's that */
	323	return (cramfs_list_inode (info, offset) > 0);
	324	}
	325
	326	/* It's a directory. List files within */
	327	offset = CRAMFS_GET_OFFSET (inode) << 2;
	328	size = CRAMFS_24 (inode->size);
	329	}
	330
	331	/* List the given directory */
	332	while (inodeoffset < size) {
700a0c64	333	inode = (struct cramfs_inode *) (PART_OFFSET(info) + offset +
dd875c76 WD	334	inodeoffset);
	335
	336	nextoffset = cramfs_list_inode (info, offset + inodeoffset);
	337	if (nextoffset == 0)
	338	break;
	339	inodeoffset += sizeof (struct cramfs_inode) + nextoffset;
	340	}
	341
	342	return 1;
	343	}
	344
	345	int cramfs_info (struct part_info *info)
	346	{
	347	if (cramfs_read_super (info))
	348	return 0;
	349
	350	printf ("size: 0x%x (%u)\n", super.size, super.size);
	351
	352	if (super.flags != 0) {
	353	printf ("flags:\n");
	354	if (super.flags & CRAMFS_FLAG_FSID_VERSION_2)
	355	printf ("\tFSID version 2\n");
	356	if (super.flags & CRAMFS_FLAG_SORTED_DIRS)
	357	printf ("\tsorted dirs\n");
	358	if (super.flags & CRAMFS_FLAG_HOLES)
	359	printf ("\tholes\n");
	360	if (super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET)
	361	printf ("\tshifted root offset\n");
	362	}
	363
	364	printf ("fsid:\n\tcrc: 0x%x\n\tedition: 0x%x\n",
	365	super.fsid.crc, super.fsid.edition);
	366	printf ("name: %16s\n", super.name);
	367
	368	return 1;
	369	}
	370
	371	int cramfs_check (struct part_info *info)
	372	{
700a0c64 WD	373	struct cramfs_super *sb;
	374
	375	if (info->dev->id->type != MTD_DEV_TYPE_NOR)
	376	return 0;
dd875c76	377
700a0c64	378	sb = (struct cramfs_super *) PART_OFFSET(info);
dd875c76 WD	379	if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC)) {
dd875c76 WD	380	/* check at 512 byte offset */
700a0c64 WD	381	sb = (struct cramfs_super *) (PART_OFFSET(info) + 512);
700a0c64 WD	382	if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC))
dd875c76	383	return 0;
dd875c76 WD	384	}
	385	return 1;
	386	}