X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/55e303ae13a4cf49d70f2294092726f2fffb9ef2..13fec9890cf095cc781fdf7b8917cb03bf32dd4c:/bsd/hfs/hfs_endian.h

diff --git a/bsd/hfs/hfs_endian.h b/bsd/hfs/hfs_endian.h
index 3996cd635..330839d29 100644
--- a/bsd/hfs/hfs_endian.h
+++ b/bsd/hfs/hfs_endian.h
@@ -3,22 +3,19 @@
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
  * 
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- * 
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
  * 
  * @APPLE_LICENSE_HEADER_END@
  */
@@ -51,7 +48,6 @@
     
     /* HFS is always big endian, no swapping needed */
     #define SWAP_HFS_PLUS_FORK_DATA(__a)
-    #define SWAP_BT_NODE(__a, __b, __c, __d)
 
 /************************/
 /* LITTLE ENDIAN Macros */
@@ -64,7 +60,6 @@
     #define SWAP_BE64(__a) 							NXSwapBigLongLongToHost (__a)
     
     #define SWAP_HFS_PLUS_FORK_DATA(__a)			hfs_swap_HFSPlusForkData ((__a))
-    #define SWAP_BT_NODE(__a, __b, __c, __d)	hfs_swap_BTNode ((__a), (__b), (__c), (__d))
 
 #else
 #warning Unknown byte order
@@ -75,8 +70,30 @@
 extern "C" {
 #endif
 
-void hfs_swap_HFSPlusForkData (HFSPlusForkData *src);
-int  hfs_swap_BTNode (BlockDescriptor *src, int isHFSPlus, HFSCatalogNodeID fileID, int unswap);
+/*
+ * Constants for the "unswap" argument to hfs_swap_BTNode:
+ */
+enum HFSBTSwapDirection {
+	kSwapBTNodeBigToHost		=	0,
+	kSwapBTNodeHostToBig		=	1,
+
+	/*
+	 * kSwapBTNodeHeaderRecordOnly is used to swap just the header record
+	 * of a header node from big endian (on disk) to host endian (in memory).
+	 * It does not swap the node descriptor (forward/backward links, record
+	 * count, etc.).  It assumes the header record is at offset 0x000E.
+	 *
+	 * Since HFS Plus doesn't have fixed B-tree node sizes, we have to read
+	 * the header record to determine the actual node size for that tree
+	 * before we can set up the B-tree control block.  We read it initially
+	 * as 512 bytes, then re-read it once we know the correct node size.  Since
+	 * we may not have read the entire header node the first time, we can't
+	 * swap the record offsets, other records, or do most sanity checks.
+	 */
+	kSwapBTNodeHeaderRecordOnly	=	3
+};
+
+int  hfs_swap_BTNode (BlockDescriptor *src, vnode_t vp, enum HFSBTSwapDirection direction);
 
 #ifdef __cplusplus
 }