/* * Copyright (c) 2000, 2005 Apple Computer, Inc. All rights reserved. * * @APPLE_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 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. * * @APPLE_LICENSE_HEADER_END@ */ #ifndef __HFS_ENDIAN_H__ #define __HFS_ENDIAN_H__ /* * hfs_endian.h * * This file prototypes endian swapping routines for the HFS/HFS Plus * volume format. */ #include <hfs/hfs_format.h> #include <architecture/byte_order.h> #include "SRuntime.h" /*********************/ /* BIG ENDIAN Macros */ /*********************/ #define SWAP_BE16(__a) OSSwapBigToHostInt16 (__a) #define SWAP_BE32(__a) OSSwapBigToHostInt32 (__a) #define SWAP_BE64(__a) OSSwapBigToHostInt64 (__a) #if BYTE_ORDER == BIG_ENDIAN /* HFS is always big endian, no swapping needed */ #define SWAP_HFSMDB(__a) #define SWAP_HFSPLUSVH(__a) /************************/ /* LITTLE ENDIAN Macros */ /************************/ #elif BYTE_ORDER == LITTLE_ENDIAN #define SWAP_HFSMDB(__a) hfs_swap_HFSMasterDirectoryBlock ((__a)) #define SWAP_HFSPLUSVH(__a) hfs_swap_HFSPlusVolumeHeader ((__a)) #else #warning Unknown byte order #error #endif #ifdef __cplusplus extern "C" { #endif /* * 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 }; void hfs_swap_HFSMasterDirectoryBlock (void *buf); void hfs_swap_HFSPlusVolumeHeader (void *buf); int hfs_swap_BTNode (BlockDescriptor *src, SFCB *fcb, enum HFSBTSwapDirection direction); #ifdef __cplusplus } #endif #endif /* __HFS_FORMAT__ */