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@@ -132,3 +132,153 @@
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case 's':
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/* old option, ignored */
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break;
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--- cramfs-1.1/cramfsck.c.orig 2005-04-25 11:50:31.000000000 -0700
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+++ cramfs-1.1/cramfsck.c 2005-04-25 16:53:25.000000000 -0700
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@@ -30,6 +30,7 @@
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* 2000/07/15: Daniel Quinlan (initial support for block devices)
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* 2002/01/10: Daniel Quinlan (additional checks, test more return codes,
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* use read if mmap fails, standardize messages)
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+ * 2004/09/01: Alfonso Acosta (Add swapping support)
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*/
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/* compile-time options */
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@@ -51,6 +52,7 @@
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#include <utime.h>
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#include <sys/ioctl.h>
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#define _LINUX_STRING_H_
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+#include <byteswap.h>
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#include "linux/cramfs_fs.h"
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#include <zlib.h>
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@@ -74,6 +76,7 @@
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static char *filename; /* ROM image filename */
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struct cramfs_super super; /* just find the cramfs superblock once */
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static int opt_verbose = 0; /* 1 = verbose (-v), 2+ = very verbose (-vv) */
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+static int need_swapping = 0; /* fs and host dont have the same endianness */
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#ifdef INCLUDE_FS_TESTS
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static int opt_extract = 0; /* extract cramfs (-x) */
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static char *extract_dir = "/"; /* extraction directory (-x) */
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@@ -85,6 +88,9 @@
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static unsigned long start_data = ~0UL; /* start of the data (256 MB = max) */
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static unsigned long end_data = 0; /* end of the data */
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+/* access 32 byte variables */
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+#define CRAMFS_32(x) (need_swapping ? bswap_32(x) : x)
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+
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/* Guarantee access to at least 8kB at a time */
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#define ROMBUFFER_BITS 13
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#define ROMBUFFERSIZE (1 << ROMBUFFER_BITS)
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@@ -166,20 +172,34 @@
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if (super.magic == CRAMFS_MAGIC) {
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*start = 0;
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}
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+ else if (super.magic == bswap_32(CRAMFS_MAGIC)) {
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+ *start = 0;
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+ need_swapping = 1;
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+ }
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+
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else if (*length >= (PAD_SIZE + sizeof(super))) {
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lseek(fd, PAD_SIZE, SEEK_SET);
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if (read(fd, &super, sizeof(super)) != sizeof(super)) {
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die(FSCK_ERROR, 1, "read failed: %s", filename);
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}
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- if (super.magic == CRAMFS_MAGIC) {
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+ if (super.magic == CRAMFS_32(CRAMFS_MAGIC)) {
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*start = PAD_SIZE;
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}
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}
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/* superblock tests */
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- if (super.magic != CRAMFS_MAGIC) {
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+ if (super.magic != CRAMFS_32(CRAMFS_MAGIC)) {
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die(FSCK_UNCORRECTED, 0, "superblock magic not found");
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}
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+ if (need_swapping){
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+ super.size = bswap_32(super.size);
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+ super.flags = bswap_32(super.flags);
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+ super.future = bswap_32(super.future);
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+ super.fsid.crc = bswap_32(super.fsid.crc);
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+ super.fsid.edition = bswap_32(super.fsid.edition);
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+ super.fsid.blocks = bswap_32(super.fsid.blocks);
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+ super.fsid.files = bswap_32(super.fsid.files);
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+ }
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if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
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die(FSCK_ERROR, 0, "unsupported filesystem features");
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}
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@@ -215,7 +235,10 @@
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die(FSCK_USAGE, 0, "unable to test CRC: old cramfs format");
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#endif /* not INCLUDE_FS_TESTS */
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}
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-
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+ else if (need_swapping) {
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+ /* crc checking in this case would mean translating the whole file */
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+ return;
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+ }
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crc = crc32(0L, Z_NULL, 0);
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buf = mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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@@ -300,12 +323,23 @@
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static struct cramfs_inode *cramfs_iget(struct cramfs_inode * i)
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{
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+#define wswap(x) (((x)>>24) | (((x)>>8)&0xff00) | (((x)&0xff00)<<8) | (((x)&0xff)<<24))
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struct cramfs_inode *inode = malloc(sizeof(struct cramfs_inode));
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if (!inode) {
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die(FSCK_ERROR, 1, "malloc failed");
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}
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- *inode = *i;
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+ if(!need_swapping) {
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+ *inode = *i;
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+ }
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+ else {
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+ inode->mode=bswap_16(i->mode);
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+ inode->uid=bswap_16(i->uid);
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+ inode->size=bswap_32(i->size << 8);
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+ inode->gid=i->gid;
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+ inode->namelen = bswap_32(((u32*)i)[2]) >> 26;
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+ inode->offset = bswap_32(((u32*)i)[2]) & 0x3FFFFFFF;
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+ }
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return inode;
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}
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@@ -324,9 +358,9 @@
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*/
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static struct cramfs_inode *read_super(void)
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{
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- unsigned long offset = super.root.offset << 2;
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-
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- if (!S_ISDIR(super.root.mode))
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+ struct cramfs_inode *root = cramfs_iget(&super.root);
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+ unsigned long offset = root->offset << 2;
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+ if (!S_ISDIR(root->mode))
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die(FSCK_UNCORRECTED, 0, "root inode is not directory");
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if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
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((offset != sizeof(struct cramfs_super)) &&
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@@ -334,7 +368,7 @@
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{
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die(FSCK_UNCORRECTED, 0, "bad root offset (%lu)", offset);
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}
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- return cramfs_iget(&super.root);
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+ return root;
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}
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static int uncompress_block(void *src, int len)
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@@ -366,7 +400,7 @@
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do {
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unsigned long out = PAGE_CACHE_SIZE;
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- unsigned long next = *(u32 *) romfs_read(offset);
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+ unsigned long next = CRAMFS_32(*(u32 *) romfs_read(offset));
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if (next > end_data) {
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end_data = next;
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@@ -529,7 +563,7 @@
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{
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unsigned long offset = i->offset << 2;
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unsigned long curr = offset + 4;
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- unsigned long next = *(u32 *) romfs_read(offset);
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+ unsigned long next = CRAMFS_32(*(u32 *) romfs_read(offset));
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unsigned long size;
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if (offset == 0) {
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Eric Andersen