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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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
 * 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.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */

/*
 * hfs_endian.c
 *
 * This file implements endian swapping routines for the HFS/HFS Plus
 * volume format.
 */

#include <architecture/byte_order.h>

#include "hfs_endian.h"
#include "hfs_dbg.h"

#undef ENDIAN_DEBUG

/* Private swapping routines */
int hfs_swap_HFSPlusBTInternalNode (BlockDescriptor *src, HFSCatalogNodeID fileID, int unswap);
int hfs_swap_HFSBTInternalNode (BlockDescriptor *src, HFSCatalogNodeID fileID, int unswap);

/*
 * hfs_swap_HFSPlusForkData
 *
 *  There's still a few spots where we still need to swap the fork data.
 */
void
hfs_swap_HFSPlusForkData (
    HFSPlusForkData *src
)
{
    int i;

	src->logicalSize		= SWAP_BE64 (src->logicalSize);

	src->clumpSize			= SWAP_BE32 (src->clumpSize);
	src->totalBlocks		= SWAP_BE32 (src->totalBlocks);

    for (i = 0; i < kHFSPlusExtentDensity; i++) {
        src->extents[i].startBlock	= SWAP_BE32 (src->extents[i].startBlock);
        src->extents[i].blockCount	= SWAP_BE32 (src->extents[i].blockCount);
    }
}

/*
 * hfs_swap_BTNode
 *
 *  NOTE: This operation is not naturally symmetric.
 *        We have to determine which way we're swapping things.
 */
int
hfs_swap_BTNode (
    BlockDescriptor *src,
    int isHFSPlus,
    HFSCatalogNodeID fileID,
    int unswap
)
{
    BTNodeDescriptor *srcDesc = src->buffer;
    UInt16 *srcOffs = NULL;

    UInt32 i;
    int error = 0;


#ifdef ENDIAN_DEBUG
    if (unswap == 0) {
        printf ("BE -> LE Swap\n");
    } else if (unswap == 1) {
        printf ("LE -> BE Swap\n");
    } else if (unswap == 3) {
        printf ("Not swapping descriptors\n");
    } else {
        panic ("%s This is impossible", "hfs_swap_BTNode:");
    }
#endif

    /* If we are doing a swap */
    if (unswap == 0) {
        /* Swap the node descriptor */
        srcDesc->fLink		= SWAP_BE32 (srcDesc->fLink);
        srcDesc->bLink		= SWAP_BE32 (srcDesc->bLink);
    
        /* Don't swap srcDesc->kind */
        /* Don't swap srcDesc->height */
        /* Don't swap srcDesc->reserved */
    
        srcDesc->numRecords	= SWAP_BE16 (srcDesc->numRecords);
        
        /* Swap the node offsets (including the free space one!) */
        srcOffs = (UInt16 *)((char *)src->buffer + (src->blockSize - ((srcDesc->numRecords + 1) * sizeof (UInt16))));

        /* Sanity check */
        if ((char *)srcOffs > ((char *)src->buffer + src->blockSize)) {
            panic ("%s Too many records in the B-Tree node", "hfs_swap_BTNode:");
        }

        for (i = 0; i < srcDesc->numRecords + 1; i++) {
            srcOffs[i]	= SWAP_BE16 (srcOffs[i]);

            /* Sanity check */
            if (srcOffs[i] >= src->blockSize) {
                panic ("%s B-Tree node offset out of range", "hfs_swap_BTNode:");
            }
        }
    }
    
    /* Swap the records (ordered by frequency of access) */
    /* Swap a B-Tree internal node */
    if ((srcDesc->kind == kBTIndexNode) ||
        (srcDesc-> kind == kBTLeafNode)) {

        if (isHFSPlus) {
            error = hfs_swap_HFSPlusBTInternalNode (src, fileID, unswap);
        } else {
            error = hfs_swap_HFSBTInternalNode (src, fileID, unswap);
        }
        
    /* Swap a B-Tree map node */
    } else if (srcDesc-> kind == kBTMapNode) {
        /* Don't swap the bitmaps, they'll be done in the bitmap routines */
    
    /* Swap a B-Tree header node */
    } else if (srcDesc-> kind == kBTHeaderNode) {
        /* The header's offset is hard-wired because we cannot trust the offset pointers */
        BTHeaderRec *srcHead = (BTHeaderRec *)((char *)src->buffer + 14);
        
        srcHead->treeDepth		=	SWAP_BE16 (srcHead->treeDepth);
        
        srcHead->rootNode		=	SWAP_BE32 (srcHead->rootNode);
        srcHead->leafRecords	=	SWAP_BE32 (srcHead->leafRecords);
        srcHead->firstLeafNode	=	SWAP_BE32 (srcHead->firstLeafNode);
        srcHead->lastLeafNode	=	SWAP_BE32 (srcHead->lastLeafNode);
        
        srcHead->nodeSize		=	SWAP_BE16 (srcHead->nodeSize);
        srcHead->maxKeyLength	=	SWAP_BE16 (srcHead->maxKeyLength);
        
        srcHead->totalNodes		=	SWAP_BE32 (srcHead->totalNodes);
        srcHead->freeNodes		=	SWAP_BE32 (srcHead->freeNodes);
        
        srcHead->clumpSize		=	SWAP_BE32 (srcHead->clumpSize);
        srcHead->attributes		=	SWAP_BE32 (srcHead->attributes);

        /* Don't swap srcHead->reserved1 */
        /* Don't swap srcHead->btreeType */
        /* Don't swap srcHead->reserved2 */
        /* Don't swap srcHead->reserved3 */
        /* Don't swap bitmap */
    }
    
    /* If we are doing an unswap */
    if (unswap == 1) {
        /* Swap the node descriptor */
        srcDesc->fLink		= SWAP_BE32 (srcDesc->fLink);
        srcDesc->bLink		= SWAP_BE32 (srcDesc->bLink);
    
        /* Don't swap srcDesc->kind */
        /* Don't swap srcDesc->height */
        /* Don't swap srcDesc->reserved */
    
        /* Swap the node offsets (including the free space one!) */
        srcOffs = (UInt16 *)((char *)src->buffer + (src->blockSize - ((srcDesc->numRecords + 1) * sizeof (UInt16))));

        /* Sanity check */
        if ((char *)srcOffs > ((char *)src->buffer + src->blockSize)) {
            panic ("%s Too many records in the B-Tree node", "hfs_swap_BTNode:");
        }

        for (i = 0; i < srcDesc->numRecords + 1; i++) {
            /* Sanity check */
            if (srcOffs[i] >= src->blockSize) {
                panic ("%s B-Tree node offset out of range", "hfs_swap_BTNode:");
            }

            srcOffs[i]	= SWAP_BE16 (srcOffs[i]);
        }
        
        srcDesc->numRecords	= SWAP_BE16 (srcDesc->numRecords);
    }
    
    return (error);
}

int
hfs_swap_HFSPlusBTInternalNode (
    BlockDescriptor *src,
    HFSCatalogNodeID fileID,
    int unswap
)
{
    BTNodeDescriptor *srcDesc = src->buffer;
    UInt16 *srcOffs = (UInt16 *)((char *)src->buffer + (src->blockSize - (srcDesc->numRecords * sizeof (UInt16))));

    UInt32 i;
    UInt32 j;

    if (fileID == kHFSExtentsFileID) {
        HFSPlusExtentKey *srcKey;
        HFSPlusExtentDescriptor *srcRec;
        
        for (i = 0; i < srcDesc->numRecords; i++) {
            srcKey = (HFSPlusExtentKey *)((char *)src->buffer + srcOffs[i]);

            if (!unswap) srcKey->keyLength		= SWAP_BE16 (srcKey->keyLength);
            srcRec = (HFSPlusExtentDescriptor *)((char *)srcKey + srcKey->keyLength + 2);
            if (unswap) srcKey->keyLength		= SWAP_BE16 (srcKey->keyLength);

            /* Don't swap srcKey->forkType */
            /* Don't swap srcKey->pad */

            srcKey->fileID			= SWAP_BE32 (srcKey->fileID);
            srcKey->startBlock		= SWAP_BE32 (srcKey->startBlock);
            
            /* Stop if this is just an index node */
            if (srcDesc->kind == kBTIndexNode) {
                *((UInt32 *)srcRec) = SWAP_BE32 (*((UInt32 *)srcRec));
                continue;
            }

            /* Swap the extent data */
            
            /* Swap each extent */
            for (j = 0; j < kHFSPlusExtentDensity; j++) {
                srcRec[j].startBlock	= SWAP_BE32 (srcRec[j].startBlock);
                srcRec[j].blockCount	= SWAP_BE32 (srcRec[j].blockCount);
            }
        }

    } else if (fileID == kHFSCatalogFileID) {
        HFSPlusCatalogKey *srcKey;
        SInt16 *srcPtr;
        
        for (i = 0; i < srcDesc->numRecords; i++) {
            srcKey = (HFSPlusCatalogKey *)((char *)src->buffer + srcOffs[i]);

            if (!unswap) srcKey->keyLength			= SWAP_BE16 (srcKey->keyLength);
            srcPtr = (SInt16 *)((char *)srcKey + srcKey->keyLength + 2);
            if (unswap) srcKey->keyLength			= SWAP_BE16 (srcKey->keyLength);
            
            srcKey->parentID						= SWAP_BE32 (srcKey->parentID);

            if (!unswap) srcKey->nodeName.length	= SWAP_BE16 (srcKey->nodeName.length);
            for (j = 0; j < srcKey->nodeName.length; j++) {
                srcKey->nodeName.unicode[j]	= SWAP_BE16 (srcKey->nodeName.unicode[j]);
            }
            if (unswap) srcKey->nodeName.length	= SWAP_BE16 (srcKey->nodeName.length);
 
            /* Stop if this is just an index node */
            if (srcDesc->kind == kBTIndexNode) {
                *((UInt32 *)srcPtr) = SWAP_BE32 (*((UInt32 *)srcPtr));
                continue;
            }
            
            /* Swap the recordType field, if unswapping, leave to later */
            if (!unswap) srcPtr[0] = SWAP_BE16 (srcPtr[0]);
            
            if (srcPtr[0] == kHFSPlusFolderRecord) {
                HFSPlusCatalogFolder *srcRec = (HFSPlusCatalogFolder *)srcPtr;
                
                srcRec->flags				= SWAP_BE16 (srcRec->flags);
                srcRec->valence				= SWAP_BE32 (srcRec->valence);
                srcRec->folderID			= SWAP_BE32 (srcRec->folderID);
                srcRec->createDate			= SWAP_BE32 (srcRec->createDate);
                srcRec->contentModDate		= SWAP_BE32 (srcRec->contentModDate);
                srcRec->attributeModDate	= SWAP_BE32 (srcRec->attributeModDate);
                srcRec->accessDate			= SWAP_BE32 (srcRec->accessDate);
                srcRec->backupDate			= SWAP_BE32 (srcRec->backupDate);
                
                srcRec->bsdInfo.ownerID		= SWAP_BE32 (srcRec->bsdInfo.ownerID);
                srcRec->bsdInfo.groupID		= SWAP_BE32 (srcRec->bsdInfo.groupID);
    
                /* Don't swap srcRec->bsdInfo.adminFlags */
                /* Don't swap srcRec->bsdInfo.ownerFlags */
    
                srcRec->bsdInfo.fileMode			= SWAP_BE16 (srcRec->bsdInfo.fileMode);
                srcRec->bsdInfo.special.iNodeNum	= SWAP_BE32 (srcRec->bsdInfo.special.iNodeNum);
    
                srcRec->textEncoding		= SWAP_BE32 (srcRec->textEncoding);
    
                /* Don't swap srcRec->userInfo */
                /* Don't swap srcRec->finderInfo */
                /* Don't swap srcRec->reserved */
    
            } else if (srcPtr[0] == kHFSPlusFileRecord) {
                HFSPlusCatalogFile *srcRec = (HFSPlusCatalogFile *)srcPtr;
                
                srcRec->flags				= SWAP_BE16 (srcRec->flags);
    
                srcRec->fileID				= SWAP_BE32 (srcRec->fileID);
    
                srcRec->createDate			= SWAP_BE32 (srcRec->createDate);
                srcRec->contentModDate		= SWAP_BE32 (srcRec->contentModDate);
                srcRec->attributeModDate	= SWAP_BE32 (srcRec->attributeModDate);
                srcRec->accessDate			= SWAP_BE32 (srcRec->accessDate);
                srcRec->backupDate			= SWAP_BE32 (srcRec->backupDate);
    
                srcRec->bsdInfo.ownerID		= SWAP_BE32 (srcRec->bsdInfo.ownerID);
                srcRec->bsdInfo.groupID		= SWAP_BE32 (srcRec->bsdInfo.groupID);
    
                /* Don't swap srcRec->bsdInfo.adminFlags */
                /* Don't swap srcRec->bsdInfo.ownerFlags */
    
                srcRec->bsdInfo.fileMode			= SWAP_BE16 (srcRec->bsdInfo.fileMode);
                srcRec->bsdInfo.special.iNodeNum	= SWAP_BE32 (srcRec->bsdInfo.special.iNodeNum);
    
                srcRec->textEncoding		= SWAP_BE32 (srcRec->textEncoding);
    
                /* Don't swap srcRec->reserved1 */
                /* Don't swap srcRec->userInfo */
                /* Don't swap srcRec->finderInfo */
                /* Don't swap srcRec->reserved2 */
    
                hfs_swap_HFSPlusForkData (&srcRec->dataFork);
                hfs_swap_HFSPlusForkData (&srcRec->resourceFork);
            
            } else if ((srcPtr[0] == kHFSPlusFolderThreadRecord) ||
                       (srcPtr[0] == kHFSPlusFileThreadRecord)) {
    
                HFSPlusCatalogThread *srcRec = (HFSPlusCatalogThread *)srcPtr;
    
                /* Don't swap srcRec->reserved */
                
                srcRec->parentID						= SWAP_BE32 (srcRec->parentID);
                
                if (!unswap) srcRec->nodeName.length	= SWAP_BE16 (srcRec->nodeName.length);
                for (j = 0; j < srcRec->nodeName.length; j++) {
                    srcRec->nodeName.unicode[j]	= SWAP_BE16 (srcRec->nodeName.unicode[j]);
                }
                if (unswap) srcRec->nodeName.length		= SWAP_BE16 (srcRec->nodeName.length);

            } else {
                panic ("%s unrecognized catalog record type", "hfs_swap_BTNode:");
            }
    
            /* If unswapping, we can safely unswap type field now */
            if (unswap) srcPtr[0] = SWAP_BE16 (srcPtr[0]);
        }
        
    } else {
        panic ("%s unrecognized B-Tree type", "hfs_swap_BTNode:");
    }

    return (0);
}

int
hfs_swap_HFSBTInternalNode (
    BlockDescriptor *src,
    HFSCatalogNodeID fileID,
    int unswap
)
{
    BTNodeDescriptor *srcDesc = src->buffer;
    UInt16 *srcOffs = (UInt16 *)((char *)src->buffer + (src->blockSize - (srcDesc->numRecords * sizeof (UInt16))));

    UInt32 i;
    UInt32 j;

    if (fileID == kHFSExtentsFileID) {
        HFSExtentKey *srcKey;
        HFSExtentDescriptor *srcRec;
        
        for (i = 0; i < srcDesc->numRecords; i++) {
            srcKey = (HFSExtentKey *)((char *)src->buffer + srcOffs[i]);

            /* Don't swap srcKey->keyLength */
            /* Don't swap srcKey->forkType */

            srcKey->fileID			= SWAP_BE32 (srcKey->fileID);
            srcKey->startBlock		= SWAP_BE16 (srcKey->startBlock);

            /* Point to record data (round up to even byte boundary) */
            srcRec = (HFSExtentDescriptor *)((char *)srcKey + ((srcKey->keyLength + 2) & ~1));
    
            /* Stop if this is just an index node */
            if (srcDesc->kind == kBTIndexNode) {
                *((UInt32 *)srcRec) = SWAP_BE32 (*((UInt32 *)srcRec));
                continue;
            }
            
            /* Swap each extent */
            for (j = 0; j < kHFSExtentDensity; j++) {
                srcRec[j].startBlock	= SWAP_BE16 (srcRec[j].startBlock);
                srcRec[j].blockCount	= SWAP_BE16 (srcRec[j].blockCount);
            }
        }
        
    } else if (fileID == kHFSCatalogFileID) {
        HFSCatalogKey *srcKey;
        SInt16 *srcPtr;
        
        for (i = 0; i < srcDesc->numRecords; i++) {
            srcKey = (HFSCatalogKey *)((char *)src->buffer + srcOffs[i]);

            /* Don't swap srcKey->keyLength */
            /* Don't swap srcKey->reserved */

            srcKey->parentID			= SWAP_BE32 (srcKey->parentID);

            /* Don't swap srcKey->nodeName */

            /* Point to record data (round up to even byte boundary) */
            srcPtr = (SInt16 *)((char *)srcKey + ((srcKey->keyLength + 2) & ~1));
            
            /* Stop if this is just an index node */
            if (srcDesc->kind == kBTIndexNode) {
                *((UInt32 *)srcPtr) = SWAP_BE32 (*((UInt32 *)srcPtr));
                continue;
            }
    
            /* Swap the recordType field, if unswapping, leave to later */
            if (!unswap) srcPtr[0] = SWAP_BE16 (srcPtr[0]);
            
            if (srcPtr[0] == kHFSFolderRecord) {
                HFSCatalogFolder *srcRec = (HFSCatalogFolder *)srcPtr;
                
                srcRec->flags				= SWAP_BE16 (srcRec->flags);
                srcRec->valence				= SWAP_BE16 (srcRec->valence);
                
                srcRec->folderID			= SWAP_BE32 (srcRec->folderID);
                srcRec->createDate			= SWAP_BE32 (srcRec->createDate);
                srcRec->modifyDate			= SWAP_BE32 (srcRec->modifyDate);
                srcRec->backupDate			= SWAP_BE32 (srcRec->backupDate);
    
                /* Don't swap srcRec->userInfo */
                /* Don't swap srcRec->finderInfo */
                /* Don't swap resserved array */
    
            } else if (srcPtr[0] == kHFSFileRecord) {
                HFSCatalogFile *srcRec = (HFSCatalogFile *)srcPtr;
                
                srcRec->flags				= srcRec->flags;
                srcRec->fileType			= srcRec->fileType;
    
                /* Don't swap srcRec->userInfo */
    
                srcRec->fileID				= SWAP_BE32 (srcRec->fileID);
                
                srcRec->dataStartBlock		= SWAP_BE16 (srcRec->dataStartBlock);
                srcRec->dataLogicalSize		= SWAP_BE32 (srcRec->dataLogicalSize);
                srcRec->dataPhysicalSize	= SWAP_BE32 (srcRec->dataPhysicalSize);
                
                srcRec->rsrcStartBlock		= SWAP_BE16 (srcRec->rsrcStartBlock);
                srcRec->rsrcLogicalSize		= SWAP_BE32 (srcRec->rsrcLogicalSize);
                srcRec->rsrcPhysicalSize	= SWAP_BE32 (srcRec->rsrcPhysicalSize);
                
                srcRec->createDate			= SWAP_BE32 (srcRec->createDate);
                srcRec->modifyDate			= SWAP_BE32 (srcRec->modifyDate);
                srcRec->backupDate			= SWAP_BE32 (srcRec->backupDate);
    
                /* Don't swap srcRec->finderInfo */
    
                srcRec->clumpSize			= SWAP_BE16 (srcRec->clumpSize);
                
                /* Swap the two sets of extents as an array of six (three each) UInt16 */
                for (j = 0; j < kHFSExtentDensity * 2; j++) {
                    srcRec->dataExtents[j].startBlock	= SWAP_BE16 (srcRec->dataExtents[j].startBlock);
                    srcRec->dataExtents[j].blockCount	= SWAP_BE16 (srcRec->dataExtents[j].blockCount);
                }
    
                /* Don't swap srcRec->reserved */
                
            } else if ((srcPtr[0] == kHFSFolderThreadRecord) ||
                    (srcPtr[0] == kHFSFileThreadRecord)) {
    
                HFSCatalogThread *srcRec = (HFSCatalogThread *)srcPtr;
    
                /* Don't swap srcRec->reserved array */
    
                srcRec->parentID			= SWAP_BE32 (srcRec->parentID);
    
                /* Don't swap srcRec->nodeName */
    
            } else {
                panic ("%s unrecognized catalog record type", "hfs_swap_BTNode:");
            }
    
            /* If unswapping, we can safely swap type now */
            if (unswap) srcPtr[0] = SWAP_BE16 (srcPtr[0]);
        }
        
    } else {
        panic ("%s unrecognized B-Tree type", "hfs_swap_BTNode:");
    }

    return (0);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
d7e50217	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
d7e50217 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
d7e50217 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25
	26	/*
	27	* hfs_endian.c
	28	*
	29	* This file implements endian swapping routines for the HFS/HFS Plus
	30	* volume format.
	31	*/
	32
	33	#include <architecture/byte_order.h>
	34
	35	#include "hfs_endian.h"
	36	#include "hfs_dbg.h"
	37
	38	#undef ENDIAN_DEBUG
	39
	40	/* Private swapping routines */
	41	int hfs_swap_HFSPlusBTInternalNode (BlockDescriptor *src, HFSCatalogNodeID fileID, int unswap);
	42	int hfs_swap_HFSBTInternalNode (BlockDescriptor *src, HFSCatalogNodeID fileID, int unswap);
	43
	44	/*
	45	* hfs_swap_HFSPlusForkData
	46	*
	47	* There's still a few spots where we still need to swap the fork data.
	48	*/
	49	void
	50	hfs_swap_HFSPlusForkData (
	51	HFSPlusForkData *src
	52	)
	53	{
	54	int i;
	55
1c79356b A	56	src->logicalSize = SWAP_BE64 (src->logicalSize);
	57
	58	src->clumpSize = SWAP_BE32 (src->clumpSize);
	59	src->totalBlocks = SWAP_BE32 (src->totalBlocks);
	60
	61	for (i = 0; i < kHFSPlusExtentDensity; i++) {
	62	src->extents[i].startBlock = SWAP_BE32 (src->extents[i].startBlock);
	63	src->extents[i].blockCount = SWAP_BE32 (src->extents[i].blockCount);
	64	}
	65	}
	66
	67	/*
	68	* hfs_swap_BTNode
	69	*
	70	* NOTE: This operation is not naturally symmetric.
	71	* We have to determine which way we're swapping things.
	72	*/
	73	int
	74	hfs_swap_BTNode (
	75	BlockDescriptor *src,
	76	int isHFSPlus,
	77	HFSCatalogNodeID fileID,
	78	int unswap
	79	)
	80	{
	81	BTNodeDescriptor *srcDesc = src->buffer;
	82	UInt16 *srcOffs = NULL;
	83
	84	UInt32 i;
	85	int error = 0;
	86
1c79356b A	87
	88	#ifdef ENDIAN_DEBUG
	89	if (unswap == 0) {
	90	printf ("BE -> LE Swap\n");
	91	} else if (unswap == 1) {
	92	printf ("LE -> BE Swap\n");
	93	} else if (unswap == 3) {
	94	printf ("Not swapping descriptors\n");
	95	} else {
	96	panic ("%s This is impossible", "hfs_swap_BTNode:");
	97	}
	98	#endif
	99
	100	/* If we are doing a swap */
	101	if (unswap == 0) {
	102	/* Swap the node descriptor */
	103	srcDesc->fLink = SWAP_BE32 (srcDesc->fLink);
	104	srcDesc->bLink = SWAP_BE32 (srcDesc->bLink);
	105
	106	/* Don't swap srcDesc->kind */
	107	/* Don't swap srcDesc->height */
	108	/* Don't swap srcDesc->reserved */
	109
	110	srcDesc->numRecords = SWAP_BE16 (srcDesc->numRecords);
	111
	112	/* Swap the node offsets (including the free space one!) */
	113	srcOffs = (UInt16 )((char )src->buffer + (src->blockSize - ((srcDesc->numRecords + 1) * sizeof (UInt16))));
	114
	115	/* Sanity check */
	116	if ((char )srcOffs > ((char )src->buffer + src->blockSize)) {
	117	panic ("%s Too many records in the B-Tree node", "hfs_swap_BTNode:");
	118	}
	119
	120	for (i = 0; i < srcDesc->numRecords + 1; i++) {
	121	srcOffs[i] = SWAP_BE16 (srcOffs[i]);
	122
	123	/* Sanity check */
	124	if (srcOffs[i] >= src->blockSize) {
	125	panic ("%s B-Tree node offset out of range", "hfs_swap_BTNode:");
	126	}
	127	}
	128	}
	129
	130	/* Swap the records (ordered by frequency of access) */
	131	/* Swap a B-Tree internal node */
	132	if ((srcDesc->kind == kBTIndexNode) \|\|
	133	(srcDesc-> kind == kBTLeafNode)) {
	134
	135	if (isHFSPlus) {
	136	error = hfs_swap_HFSPlusBTInternalNode (src, fileID, unswap);
	137	} else {
	138	error = hfs_swap_HFSBTInternalNode (src, fileID, unswap);
	139	}
	140
	141	/* Swap a B-Tree map node */
	142	} else if (srcDesc-> kind == kBTMapNode) {
	143	/* Don't swap the bitmaps, they'll be done in the bitmap routines */
	144
	145	/* Swap a B-Tree header node */
	146	} else if (srcDesc-> kind == kBTHeaderNode) {
	147	/* The header's offset is hard-wired because we cannot trust the offset pointers */
	148	BTHeaderRec srcHead = (BTHeaderRec )((char *)src->buffer + 14);
	149
	150	srcHead->treeDepth = SWAP_BE16 (srcHead->treeDepth);
151
152	srcHead->rootNode = SWAP_BE32 (srcHead->rootNode);
153	srcHead->leafRecords = SWAP_BE32 (srcHead->leafRecords);
154	srcHead->firstLeafNode = SWAP_BE32 (srcHead->firstLeafNode);
155	srcHead->lastLeafNode = SWAP_BE32 (srcHead->lastLeafNode);
156
157	srcHead->nodeSize = SWAP_BE16 (srcHead->nodeSize);
158	srcHead->maxKeyLength = SWAP_BE16 (srcHead->maxKeyLength);
159
160	srcHead->totalNodes = SWAP_BE32 (srcHead->totalNodes);
161	srcHead->freeNodes = SWAP_BE32 (srcHead->freeNodes);
162
163	srcHead->clumpSize = SWAP_BE32 (srcHead->clumpSize);
164	srcHead->attributes = SWAP_BE32 (srcHead->attributes);
165
166	/* Don't swap srcHead->reserved1 */
167	/* Don't swap srcHead->btreeType */
168	/* Don't swap srcHead->reserved2 */
169	/* Don't swap srcHead->reserved3 */
170	/* Don't swap bitmap */
171	}
172
173	/* If we are doing an unswap */
174	if (unswap == 1) {
175	/* Swap the node descriptor */
176	srcDesc->fLink = SWAP_BE32 (srcDesc->fLink);
177	srcDesc->bLink = SWAP_BE32 (srcDesc->bLink);
178
179	/* Don't swap srcDesc->kind */
180	/* Don't swap srcDesc->height */
181	/* Don't swap srcDesc->reserved */
182
183	/* Swap the node offsets (including the free space one!) */
184	srcOffs = (UInt16 )((char )src->buffer + (src->blockSize - ((srcDesc->numRecords + 1) * sizeof (UInt16))));
185
186	/* Sanity check */
187	if ((char )srcOffs > ((char )src->buffer + src->blockSize)) {
188	panic ("%s Too many records in the B-Tree node", "hfs_swap_BTNode:");
189	}
190
191	for (i = 0; i < srcDesc->numRecords + 1; i++) {
192	/* Sanity check */
193	if (srcOffs[i] >= src->blockSize) {
194	panic ("%s B-Tree node offset out of range", "hfs_swap_BTNode:");
195	}
196
197	srcOffs[i] = SWAP_BE16 (srcOffs[i]);
198	}
199
200	srcDesc->numRecords = SWAP_BE16 (srcDesc->numRecords);
201	}
202
203	return (error);
204	}
205
206	int
207	hfs_swap_HFSPlusBTInternalNode (
208	BlockDescriptor *src,
209	HFSCatalogNodeID fileID,
210	int unswap
211	)
212	{
213	BTNodeDescriptor *srcDesc = src->buffer;
214	UInt16 srcOffs = (UInt16 )((char )src->buffer + (src->blockSize - (srcDesc->numRecords sizeof (UInt16))));
215
216	UInt32 i;
217	UInt32 j;
218
1c79356b A	219	if (fileID == kHFSExtentsFileID) {
	220	HFSPlusExtentKey *srcKey;
	221	HFSPlusExtentDescriptor *srcRec;
	222
	223	for (i = 0; i < srcDesc->numRecords; i++) {
	224	srcKey = (HFSPlusExtentKey )((char )src->buffer + srcOffs[i]);
	225
	226	if (!unswap) srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
	227	srcRec = (HFSPlusExtentDescriptor )((char )srcKey + srcKey->keyLength + 2);
	228	if (unswap) srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
	229
	230	/* Don't swap srcKey->forkType */
	231	/* Don't swap srcKey->pad */
	232
	233	srcKey->fileID = SWAP_BE32 (srcKey->fileID);
	234	srcKey->startBlock = SWAP_BE32 (srcKey->startBlock);
	235
	236	/* Stop if this is just an index node */
	237	if (srcDesc->kind == kBTIndexNode) {
	238	((UInt32 )srcRec) = SWAP_BE32 (((UInt32 )srcRec));
	239	continue;
	240	}
	241
	242	/* Swap the extent data */
	243
	244	/* Swap each extent */
	245	for (j = 0; j < kHFSPlusExtentDensity; j++) {
	246	srcRec[j].startBlock = SWAP_BE32 (srcRec[j].startBlock);
	247	srcRec[j].blockCount = SWAP_BE32 (srcRec[j].blockCount);
	248	}
	249	}
	250
	251	} else if (fileID == kHFSCatalogFileID) {
	252	HFSPlusCatalogKey *srcKey;
	253	SInt16 *srcPtr;
	254
	255	for (i = 0; i < srcDesc->numRecords; i++) {
	256	srcKey = (HFSPlusCatalogKey )((char )src->buffer + srcOffs[i]);
	257
	258	if (!unswap) srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
	259	srcPtr = (SInt16 )((char )srcKey + srcKey->keyLength + 2);
	260	if (unswap) srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
	261
	262	srcKey->parentID = SWAP_BE32 (srcKey->parentID);
	263
	264	if (!unswap) srcKey->nodeName.length = SWAP_BE16 (srcKey->nodeName.length);
	265	for (j = 0; j < srcKey->nodeName.length; j++) {
	266	srcKey->nodeName.unicode[j] = SWAP_BE16 (srcKey->nodeName.unicode[j]);
	267	}
	268	if (unswap) srcKey->nodeName.length = SWAP_BE16 (srcKey->nodeName.length);
	269
	270	/* Stop if this is just an index node */
	271	if (srcDesc->kind == kBTIndexNode) {
	272	((UInt32 )srcPtr) = SWAP_BE32 (((UInt32 )srcPtr));
	273	continue;
	274	}
	275
	276	/* Swap the recordType field, if unswapping, leave to later */
	277	if (!unswap) srcPtr[0] = SWAP_BE16 (srcPtr[0]);
	278
	279	if (srcPtr[0] == kHFSPlusFolderRecord) {
	280	HFSPlusCatalogFolder srcRec = (HFSPlusCatalogFolder )srcPtr;
	281
	282	srcRec->flags = SWAP_BE16 (srcRec->flags);
283	srcRec->valence = SWAP_BE32 (srcRec->valence);
284	srcRec->folderID = SWAP_BE32 (srcRec->folderID);
285	srcRec->createDate = SWAP_BE32 (srcRec->createDate);
286	srcRec->contentModDate = SWAP_BE32 (srcRec->contentModDate);
287	srcRec->attributeModDate = SWAP_BE32 (srcRec->attributeModDate);
288	srcRec->accessDate = SWAP_BE32 (srcRec->accessDate);
289	srcRec->backupDate = SWAP_BE32 (srcRec->backupDate);
290
291	srcRec->bsdInfo.ownerID = SWAP_BE32 (srcRec->bsdInfo.ownerID);
292	srcRec->bsdInfo.groupID = SWAP_BE32 (srcRec->bsdInfo.groupID);
293
294	/* Don't swap srcRec->bsdInfo.adminFlags */
295	/* Don't swap srcRec->bsdInfo.ownerFlags */
296
297	srcRec->bsdInfo.fileMode = SWAP_BE16 (srcRec->bsdInfo.fileMode);
298	srcRec->bsdInfo.special.iNodeNum = SWAP_BE32 (srcRec->bsdInfo.special.iNodeNum);
299
300	srcRec->textEncoding = SWAP_BE32 (srcRec->textEncoding);
301
302	/* Don't swap srcRec->userInfo */
303	/* Don't swap srcRec->finderInfo */
304	/* Don't swap srcRec->reserved */
305
306	} else if (srcPtr[0] == kHFSPlusFileRecord) {
307	HFSPlusCatalogFile srcRec = (HFSPlusCatalogFile )srcPtr;
308
309	srcRec->flags = SWAP_BE16 (srcRec->flags);
310
311	srcRec->fileID = SWAP_BE32 (srcRec->fileID);
312
313	srcRec->createDate = SWAP_BE32 (srcRec->createDate);
314	srcRec->contentModDate = SWAP_BE32 (srcRec->contentModDate);
315	srcRec->attributeModDate = SWAP_BE32 (srcRec->attributeModDate);
316	srcRec->accessDate = SWAP_BE32 (srcRec->accessDate);
317	srcRec->backupDate = SWAP_BE32 (srcRec->backupDate);
318
319	srcRec->bsdInfo.ownerID = SWAP_BE32 (srcRec->bsdInfo.ownerID);
320	srcRec->bsdInfo.groupID = SWAP_BE32 (srcRec->bsdInfo.groupID);
321
322	/* Don't swap srcRec->bsdInfo.adminFlags */
323	/* Don't swap srcRec->bsdInfo.ownerFlags */
324
325	srcRec->bsdInfo.fileMode = SWAP_BE16 (srcRec->bsdInfo.fileMode);
326	srcRec->bsdInfo.special.iNodeNum = SWAP_BE32 (srcRec->bsdInfo.special.iNodeNum);
327
328	srcRec->textEncoding = SWAP_BE32 (srcRec->textEncoding);
329
330	/* Don't swap srcRec->reserved1 */
331	/* Don't swap srcRec->userInfo */
332	/* Don't swap srcRec->finderInfo */
333	/* Don't swap srcRec->reserved2 */
334
335	hfs_swap_HFSPlusForkData (&srcRec->dataFork);
336	hfs_swap_HFSPlusForkData (&srcRec->resourceFork);
337
338	} else if ((srcPtr[0] == kHFSPlusFolderThreadRecord) \|\|
339	(srcPtr[0] == kHFSPlusFileThreadRecord)) {
340
341	HFSPlusCatalogThread srcRec = (HFSPlusCatalogThread )srcPtr;
342
343	/* Don't swap srcRec->reserved */
344
345	srcRec->parentID = SWAP_BE32 (srcRec->parentID);
346
347	if (!unswap) srcRec->nodeName.length = SWAP_BE16 (srcRec->nodeName.length);
348	for (j = 0; j < srcRec->nodeName.length; j++) {
349	srcRec->nodeName.unicode[j] = SWAP_BE16 (srcRec->nodeName.unicode[j]);
350	}
351	if (unswap) srcRec->nodeName.length = SWAP_BE16 (srcRec->nodeName.length);
352
353	} else {
354	panic ("%s unrecognized catalog record type", "hfs_swap_BTNode:");
355	}
356
357	/* If unswapping, we can safely unswap type field now */
358	if (unswap) srcPtr[0] = SWAP_BE16 (srcPtr[0]);
359	}
360
361	} else {
362	panic ("%s unrecognized B-Tree type", "hfs_swap_BTNode:");
363	}
364
365	return (0);
366	}
367
368	int
369	hfs_swap_HFSBTInternalNode (
370	BlockDescriptor *src,
371	HFSCatalogNodeID fileID,
372	int unswap
373	)
374	{
375	BTNodeDescriptor *srcDesc = src->buffer;
376	UInt16 srcOffs = (UInt16 )((char )src->buffer + (src->blockSize - (srcDesc->numRecords sizeof (UInt16))));
377
378	UInt32 i;
379	UInt32 j;
380
1c79356b A	381	if (fileID == kHFSExtentsFileID) {
	382	HFSExtentKey *srcKey;
	383	HFSExtentDescriptor *srcRec;
	384
	385	for (i = 0; i < srcDesc->numRecords; i++) {
	386	srcKey = (HFSExtentKey )((char )src->buffer + srcOffs[i]);
	387
	388	/* Don't swap srcKey->keyLength */
	389	/* Don't swap srcKey->forkType */
	390
	391	srcKey->fileID = SWAP_BE32 (srcKey->fileID);
	392	srcKey->startBlock = SWAP_BE16 (srcKey->startBlock);
	393
	394	/* Point to record data (round up to even byte boundary) */
	395	srcRec = (HFSExtentDescriptor )((char )srcKey + ((srcKey->keyLength + 2) & ~1));
	396
	397	/* Stop if this is just an index node */
	398	if (srcDesc->kind == kBTIndexNode) {
	399	((UInt32 )srcRec) = SWAP_BE32 (((UInt32 )srcRec));
	400	continue;
	401	}
	402
	403	/* Swap each extent */
	404	for (j = 0; j < kHFSExtentDensity; j++) {
	405	srcRec[j].startBlock = SWAP_BE16 (srcRec[j].startBlock);
	406	srcRec[j].blockCount = SWAP_BE16 (srcRec[j].blockCount);
	407	}
	408	}
	409
	410	} else if (fileID == kHFSCatalogFileID) {
	411	HFSCatalogKey *srcKey;
	412	SInt16 *srcPtr;
	413
	414	for (i = 0; i < srcDesc->numRecords; i++) {
	415	srcKey = (HFSCatalogKey )((char )src->buffer + srcOffs[i]);
	416
	417	/* Don't swap srcKey->keyLength */
	418	/* Don't swap srcKey->reserved */
	419
	420	srcKey->parentID = SWAP_BE32 (srcKey->parentID);
	421
	422	/* Don't swap srcKey->nodeName */
	423
	424	/* Point to record data (round up to even byte boundary) */
	425	srcPtr = (SInt16 )((char )srcKey + ((srcKey->keyLength + 2) & ~1));
	426
	427	/* Stop if this is just an index node */
	428	if (srcDesc->kind == kBTIndexNode) {
	429	((UInt32 )srcPtr) = SWAP_BE32 (((UInt32 )srcPtr));
	430	continue;
	431	}
	432
	433	/* Swap the recordType field, if unswapping, leave to later */
	434	if (!unswap) srcPtr[0] = SWAP_BE16 (srcPtr[0]);
	435
	436	if (srcPtr[0] == kHFSFolderRecord) {
	437	HFSCatalogFolder srcRec = (HFSCatalogFolder )srcPtr;
	438
	439	srcRec->flags = SWAP_BE16 (srcRec->flags);
	440	srcRec->valence = SWAP_BE16 (srcRec->valence);
	441
	442	srcRec->folderID = SWAP_BE32 (srcRec->folderID);
	443	srcRec->createDate = SWAP_BE32 (srcRec->createDate);
	444	srcRec->modifyDate = SWAP_BE32 (srcRec->modifyDate);
445	srcRec->backupDate = SWAP_BE32 (srcRec->backupDate);
446
447	/* Don't swap srcRec->userInfo */
448	/* Don't swap srcRec->finderInfo */
449	/* Don't swap resserved array */
450
451	} else if (srcPtr[0] == kHFSFileRecord) {
452	HFSCatalogFile srcRec = (HFSCatalogFile )srcPtr;
453
454	srcRec->flags = srcRec->flags;
455	srcRec->fileType = srcRec->fileType;
456
457	/* Don't swap srcRec->userInfo */
458
459	srcRec->fileID = SWAP_BE32 (srcRec->fileID);
460
461	srcRec->dataStartBlock = SWAP_BE16 (srcRec->dataStartBlock);
462	srcRec->dataLogicalSize = SWAP_BE32 (srcRec->dataLogicalSize);
463	srcRec->dataPhysicalSize = SWAP_BE32 (srcRec->dataPhysicalSize);
464
465	srcRec->rsrcStartBlock = SWAP_BE16 (srcRec->rsrcStartBlock);
466	srcRec->rsrcLogicalSize = SWAP_BE32 (srcRec->rsrcLogicalSize);
467	srcRec->rsrcPhysicalSize = SWAP_BE32 (srcRec->rsrcPhysicalSize);
468
469	srcRec->createDate = SWAP_BE32 (srcRec->createDate);
470	srcRec->modifyDate = SWAP_BE32 (srcRec->modifyDate);
471	srcRec->backupDate = SWAP_BE32 (srcRec->backupDate);
472
473	/* Don't swap srcRec->finderInfo */
474
475	srcRec->clumpSize = SWAP_BE16 (srcRec->clumpSize);
476
477	/* Swap the two sets of extents as an array of six (three each) UInt16 */
478	for (j = 0; j < kHFSExtentDensity * 2; j++) {
479	srcRec->dataExtents[j].startBlock = SWAP_BE16 (srcRec->dataExtents[j].startBlock);
480	srcRec->dataExtents[j].blockCount = SWAP_BE16 (srcRec->dataExtents[j].blockCount);
481	}
482
483	/* Don't swap srcRec->reserved */
484
485	} else if ((srcPtr[0] == kHFSFolderThreadRecord) \|\|
486	(srcPtr[0] == kHFSFileThreadRecord)) {
487
488	HFSCatalogThread srcRec = (HFSCatalogThread )srcPtr;
489
490	/* Don't swap srcRec->reserved array */
491
492	srcRec->parentID = SWAP_BE32 (srcRec->parentID);
493
494	/* Don't swap srcRec->nodeName */
495
496	} else {
497	panic ("%s unrecognized catalog record type", "hfs_swap_BTNode:");
498	}
499
500	/* If unswapping, we can safely swap type now */
501	if (unswap) srcPtr[0] = SWAP_BE16 (srcPtr[0]);
502	}
503
504	} else {
505	panic ("%s unrecognized B-Tree type", "hfs_swap_BTNode:");
506	}
507
508	return (0);
509	}