From 483fa88f3e9f8f5b20ac7085f9626123f5c1d3a4 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 14 Apr 2005 07:59:42 +0000
Subject: Update cramfs to handle switching endianness when necessary

---
 target/cramfs/cramfs-02-endian.patch | 125 +++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 target/cramfs/cramfs-02-endian.patch

(limited to 'target/cramfs/cramfs-02-endian.patch')

diff --git a/target/cramfs/cramfs-02-endian.patch b/target/cramfs/cramfs-02-endian.patch
new file mode 100644
index 000000000..2b9df3f3a
--- /dev/null
+++ b/target/cramfs/cramfs-02-endian.patch
@@ -0,0 +1,125 @@
+--- 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 +156,7 @@
+ 		" -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"
++		" -r         reverse endian-ness of 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:prsvzD:q")) != EOF) {
+ 		switch (c) {
+ 		case 'h':
+ 			usage(MKFS_OK);
+@@ -1174,6 +1226,10 @@
+ 			opt_pad = PAD_SIZE;
+ 			fslen_ub += PAD_SIZE;
+ 			break;
++		case 'r':
++			swap_endian = 1;
++			printf("Swapping filesystem endian-ness\n");
++			break;
+ 		case 's':
+ 			/* old option, ignored */
+ 			break;
-- 
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