xnu-792.17.14.tar.gz

[apple/xnu.git] / bsd / hfs / hfs_endian.h

diff --git a/bsd/hfs/hfs_endian.h b/bsd/hfs/hfs_endian.h
index 06801dc693bdfabfaf8f88163cd88a98b40de9a2..004e36c1235119bfbc67671740497902b100c988 100644 (file)
--- a/bsd/hfs/hfs_endian.h
+++ b/bsd/hfs/hfs_endian.h
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * 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. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * 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.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 #ifndef __HFS_ENDIAN_H__
 #define __HFS_ENDIAN_H__
@@ -48,7 +54,6 @@
     
     /* 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 */
@@ -61,7 +66,6 @@
     #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
@@ -72,8 +76,30 @@
 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
 }