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--- cramfs-1.1/mkcramfs.c.orig 2005-04-13 05:55:57.000000000 -0600
+++ cramfs-1.1/mkcramfs.c 2005-04-13 16:19:57.000000000 -0600
@@ -117,6 +117,7 @@
static int opt_squash = 0;
static char *opt_image = NULL;
static char *opt_name = NULL;
+static int swap_endian = 0;
static int warn_dev, warn_gid, warn_namelen, warn_skip, warn_size, warn_uid;
static const char *const memory_exhausted = "memory exhausted";
@@ -155,6 +156,8 @@
" -i file insert a file image into the filesystem (requires >= 2.4.0)\n"
" -n name set name of cramfs filesystem\n"
" -p pad by %d bytes for boot code\n"
+ " -l litte endian filesystem\n"
+ " -b big endian filesystem\n"
" -s sort directory entries (old option, ignored)\n"
" -v be more verbose\n"
" -z make explicit holes (requires >= 2.3.39)\n"
@@ -504,6 +506,50 @@
return totalsize;
}
+/* routines to swap endianness/bitfields in inode/superblock block data */
+static void fix_inode(struct cramfs_inode *inode)
+{
+#define wswap(x) (((x)>>24) | (((x)>>8)&0xff00) | (((x)&0xff00)<<8) | (((x)&0xff)<<24))
+ /* attempt #2 */
+ inode->mode = (inode->mode >> 8) | ((inode->mode&0xff)<<8);
+ inode->uid = (inode->uid >> 8) | ((inode->uid&0xff)<<8);
+ inode->size = (inode->size >> 16) | (inode->size&0xff00) |
+ ((inode->size&0xff)<<16);
+ ((u32*)inode)[2] = wswap(inode->offset | (inode->namelen<<26));
+}
+
+static void fix_offset(struct cramfs_inode *inode, u32 offset)
+{
+ u32 tmp = wswap(((u32*)inode)[2]);
+ ((u32*)inode)[2] = wswap((offset >> 2) | (tmp&0xfc000000));
+}
+
+static void fix_block_pointer(u32 *p)
+{
+ *p = wswap(*p);
+}
+
+static void fix_super(struct cramfs_super *super)
+{
+ u32 *p = (u32*)super;
+
+ /* fix superblock fields */
+ p[0] = wswap(p[0]); /* magic */
+ p[1] = wswap(p[1]); /* size */
+ p[2] = wswap(p[2]); /* flags */
+ p[3] = wswap(p[3]); /* future */
+
+ /* fix filesystem info fields */
+ p = (u32*)&super->fsid;
+ p[0] = wswap(p[0]); /* crc */
+ p[1] = wswap(p[1]); /* edition */
+ p[2] = wswap(p[2]); /* blocks */
+ p[3] = wswap(p[3]); /* files */
+
+ fix_inode(&super->root);
+#undef wswap
+}
+
/* Returns sizeof(struct cramfs_super), which includes the root inode. */
static unsigned int write_superblock(struct entry *root, char *base, int size)
{
@@ -539,6 +585,7 @@
super->root.gid = root->gid;
super->root.size = root->size;
super->root.offset = offset >> 2;
+ if (swap_endian) fix_super(super);
return offset;
}
@@ -553,7 +600,10 @@
if (offset >= (1 << (2 + CRAMFS_OFFSET_WIDTH))) {
error_msg_and_die("filesystem too big");
}
- inode->offset = (offset >> 2);
+ if (swap_endian)
+ fix_offset(inode, offset);
+ else
+ inode->offset = (offset >> 2);
}
/*
@@ -638,6 +688,7 @@
stack_entries++;
}
entry = entry->next;
+ if (swap_endian) fix_inode(inode);
}
/*
@@ -734,6 +785,7 @@
}
*(u32 *) (base + offset) = curr;
+ if (swap_endian) fix_block_pointer((u32*)(base + offset));
offset += 4;
} while (size);
@@ -1146,7 +1198,7 @@
progname = argv[0];
/* command line options */
- while ((c = getopt(argc, argv, "hEe:i:n:psvzD:q")) != EOF) {
+ while ((c = getopt(argc, argv, "hEe:i:n:psvzD:qlb")) != EOF) {
switch (c) {
case 'h':
usage(MKFS_OK);
@@ -1174,6 +1227,18 @@
opt_pad = PAD_SIZE;
fslen_ub += PAD_SIZE;
break;
+ case 'b':
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ swap_endian = 1;
+ printf("Swapping filesystem endian-ness\n");
+#endif
+ break;
+ case 'l':
+#if __BYTE_ORDER == __BIG_ENDIAN
+ swap_endian = 1;
+ printf("Swapping filesystem endian-ness\n");
+#endif
+ break;
case 's':
/* old option, ignored */
break;
--- cramfs-1.1/cramfsck.c.orig 2005-04-25 11:50:31.000000000 -0700
+++ cramfs-1.1/cramfsck.c 2005-04-25 16:53:25.000000000 -0700
@@ -30,6 +30,7 @@
* 2000/07/15: Daniel Quinlan (initial support for block devices)
* 2002/01/10: Daniel Quinlan (additional checks, test more return codes,
* use read if mmap fails, standardize messages)
+ * 2004/09/01: Alfonso Acosta (Add swapping support)
*/
/* compile-time options */
@@ -51,6 +52,7 @@
#include <utime.h>
#include <sys/ioctl.h>
#define _LINUX_STRING_H_
+#include <byteswap.h>
#include "linux/cramfs_fs.h"
#include <zlib.h>
@@ -74,6 +76,7 @@
static char *filename; /* ROM image filename */
struct cramfs_super super; /* just find the cramfs superblock once */
static int opt_verbose = 0; /* 1 = verbose (-v), 2+ = very verbose (-vv) */
+static int need_swapping = 0; /* fs and host dont have the same endianness */
#ifdef INCLUDE_FS_TESTS
static int opt_extract = 0; /* extract cramfs (-x) */
static char *extract_dir = "/"; /* extraction directory (-x) */
@@ -85,6 +88,9 @@
static unsigned long start_data = ~0UL; /* start of the data (256 MB = max) */
static unsigned long end_data = 0; /* end of the data */
+/* access 32 byte variables */
+#define CRAMFS_32(x) (need_swapping ? bswap_32(x) : x)
+
/* Guarantee access to at least 8kB at a time */
#define ROMBUFFER_BITS 13
#define ROMBUFFERSIZE (1 << ROMBUFFER_BITS)
@@ -166,20 +172,34 @@
if (super.magic == CRAMFS_MAGIC) {
*start = 0;
}
+ else if (super.magic == bswap_32(CRAMFS_MAGIC)) {
+ *start = 0;
+ need_swapping = 1;
+ }
+
else if (*length >= (PAD_SIZE + sizeof(super))) {
lseek(fd, PAD_SIZE, SEEK_SET);
if (read(fd, &super, sizeof(super)) != sizeof(super)) {
die(FSCK_ERROR, 1, "read failed: %s", filename);
}
- if (super.magic == CRAMFS_MAGIC) {
+ if (super.magic == CRAMFS_32(CRAMFS_MAGIC)) {
*start = PAD_SIZE;
}
}
/* superblock tests */
- if (super.magic != CRAMFS_MAGIC) {
+ if (super.magic != CRAMFS_32(CRAMFS_MAGIC)) {
die(FSCK_UNCORRECTED, 0, "superblock magic not found");
}
+ if (need_swapping){
+ super.size = bswap_32(super.size);
+ super.flags = bswap_32(super.flags);
+ super.future = bswap_32(super.future);
+ super.fsid.crc = bswap_32(super.fsid.crc);
+ super.fsid.edition = bswap_32(super.fsid.edition);
+ super.fsid.blocks = bswap_32(super.fsid.blocks);
+ super.fsid.files = bswap_32(super.fsid.files);
+ }
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
die(FSCK_ERROR, 0, "unsupported filesystem features");
}
@@ -215,7 +235,10 @@
die(FSCK_USAGE, 0, "unable to test CRC: old cramfs format");
#endif /* not INCLUDE_FS_TESTS */
}
-
+ else if (need_swapping) {
+ /* crc checking in this case would mean translating the whole file */
+ return;
+ }
crc = crc32(0L, Z_NULL, 0);
buf = mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
@@ -300,12 +323,23 @@
static struct cramfs_inode *cramfs_iget(struct cramfs_inode * i)
{
+#define wswap(x) (((x)>>24) | (((x)>>8)&0xff00) | (((x)&0xff00)<<8) | (((x)&0xff)<<24))
struct cramfs_inode *inode = malloc(sizeof(struct cramfs_inode));
if (!inode) {
die(FSCK_ERROR, 1, "malloc failed");
}
- *inode = *i;
+ if(!need_swapping) {
+ *inode = *i;
+ }
+ else {
+ inode->mode=bswap_16(i->mode);
+ inode->uid=bswap_16(i->uid);
+ inode->size=bswap_32(i->size << 8);
+ inode->gid=i->gid;
+ inode->namelen = bswap_32(((u32*)i)[2]) >> 26;
+ inode->offset = bswap_32(((u32*)i)[2]) & 0x3FFFFFFF;
+ }
return inode;
}
@@ -324,9 +358,9 @@
*/
static struct cramfs_inode *read_super(void)
{
- unsigned long offset = super.root.offset << 2;
-
- if (!S_ISDIR(super.root.mode))
+ struct cramfs_inode *root = cramfs_iget(&super.root);
+ unsigned long offset = root->offset << 2;
+ if (!S_ISDIR(root->mode))
die(FSCK_UNCORRECTED, 0, "root inode is not directory");
if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
((offset != sizeof(struct cramfs_super)) &&
@@ -334,7 +368,7 @@
{
die(FSCK_UNCORRECTED, 0, "bad root offset (%lu)", offset);
}
- return cramfs_iget(&super.root);
+ return root;
}
static int uncompress_block(void *src, int len)
@@ -366,7 +400,7 @@
do {
unsigned long out = PAGE_CACHE_SIZE;
- unsigned long next = *(u32 *) romfs_read(offset);
+ unsigned long next = CRAMFS_32(*(u32 *) romfs_read(offset));
if (next > end_data) {
end_data = next;
@@ -529,7 +563,7 @@
{
unsigned long offset = i->offset << 2;
unsigned long curr = offset + 4;
- unsigned long next = *(u32 *) romfs_read(offset);
+ unsigned long next = CRAMFS_32(*(u32 *) romfs_read(offset));
unsigned long size;
if (offset == 0) {
|
