504 lines
24 KiB
C
504 lines
24 KiB
C
/*
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File: HFSVolumes.h
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Contains: On-disk data structures for HFS and HFS Plus volumes.
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Version: QuickTime 7.3
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Copyright: (c) 2007 (c) 1984-2001 by Apple Computer, Inc. All rights reserved.
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Bugs?: For bug reports, consult the following page on
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the World Wide Web:
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http://developer.apple.com/bugreporter/
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*/
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#ifndef __HFSVOLUMES__
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#define __HFSVOLUMES__
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#ifndef __MACTYPES__
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#include <MacTypes.h>
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#endif
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#ifndef __FILES__
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#include <Files.h>
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#endif
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#ifndef __FINDER__
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#include <Finder.h>
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#endif
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#if PRAGMA_ONCE
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#pragma once
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#endif
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#if PRAGMA_IMPORT
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#pragma import on
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#endif
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#if PRAGMA_STRUCT_ALIGN
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#pragma options align=mac68k
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#elif PRAGMA_STRUCT_PACKPUSH
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#pragma pack(push, 2)
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#elif PRAGMA_STRUCT_PACK
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#pragma pack(2)
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#endif
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/* Signatures used to differentiate between HFS and HFS Plus volumes */
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enum {
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kHFSSigWord = 0x4244, /* 'BD' in ASCII */
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kHFSPlusSigWord = 0x482B, /* 'H+' in ASCII */
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kHFSPlusVersion = 0x0004, /* will change as format changes (version 4 shipped with Mac OS 8.1) */
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kHFSPlusMountVersion = FOUR_CHAR_CODE('8.10') /* will change as implementations change ('8.10' in Mac OS 8.1) */
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};
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/* CatalogNodeID is used to track catalog objects */
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typedef UInt32 HFSCatalogNodeID;
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enum {
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kHFSMaxVolumeNameChars = 27,
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kHFSMaxFileNameChars = 31,
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kHFSPlusMaxFileNameChars = 255
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};
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/* Extent overflow file data structures */
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/* HFS Extent key */
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struct HFSExtentKey {
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UInt8 keyLength; /* length of key, excluding this field */
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UInt8 forkType; /* 0 = data fork, FF = resource fork */
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HFSCatalogNodeID fileID; /* file ID */
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UInt16 startBlock; /* first file allocation block number in this extent */
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};
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typedef struct HFSExtentKey HFSExtentKey;
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/* HFS Plus Extent key */
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struct HFSPlusExtentKey {
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UInt16 keyLength; /* length of key, excluding this field */
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UInt8 forkType; /* 0 = data fork, FF = resource fork */
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UInt8 pad; /* make the other fields align on 32-bit boundary */
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HFSCatalogNodeID fileID; /* file ID */
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UInt32 startBlock; /* first file allocation block number in this extent */
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};
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typedef struct HFSPlusExtentKey HFSPlusExtentKey;
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/* Number of extent descriptors per extent record */
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enum {
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kHFSExtentDensity = 3,
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kHFSPlusExtentDensity = 8
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};
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/* HFS extent descriptor */
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struct HFSExtentDescriptor {
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UInt16 startBlock; /* first allocation block */
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UInt16 blockCount; /* number of allocation blocks */
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};
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typedef struct HFSExtentDescriptor HFSExtentDescriptor;
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/* HFS Plus extent descriptor */
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struct HFSPlusExtentDescriptor {
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UInt32 startBlock; /* first allocation block */
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UInt32 blockCount; /* number of allocation blocks */
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};
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typedef struct HFSPlusExtentDescriptor HFSPlusExtentDescriptor;
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/* HFS extent record */
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typedef HFSExtentDescriptor HFSExtentRecord[3];
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/* HFS Plus extent record */
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typedef HFSPlusExtentDescriptor HFSPlusExtentRecord[8];
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/* Fork data info (HFS Plus only) - 80 bytes */
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struct HFSPlusForkData {
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UInt64 logicalSize; /* fork's logical size in bytes */
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UInt32 clumpSize; /* fork's clump size in bytes */
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UInt32 totalBlocks; /* total blocks used by this fork */
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HFSPlusExtentRecord extents; /* initial set of extents */
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};
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typedef struct HFSPlusForkData HFSPlusForkData;
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/* Permissions info (HFS Plus only) - 16 bytes */
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struct HFSPlusPermissions {
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UInt32 ownerID; /* user or group ID of file/folder owner */
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UInt32 groupID; /* additional user of group ID */
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UInt32 permissions; /* permissions (bytes: unused, owner, group, everyone) */
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UInt32 specialDevice; /* UNIX: device for character or block special file */
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};
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typedef struct HFSPlusPermissions HFSPlusPermissions;
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/* Catalog file data structures */
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enum {
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kHFSRootParentID = 1, /* Parent ID of the root folder */
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kHFSRootFolderID = 2, /* Folder ID of the root folder */
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kHFSExtentsFileID = 3, /* File ID of the extents file */
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kHFSCatalogFileID = 4, /* File ID of the catalog file */
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kHFSBadBlockFileID = 5, /* File ID of the bad allocation block file */
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kHFSAllocationFileID = 6, /* File ID of the allocation file (HFS Plus only) */
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kHFSStartupFileID = 7, /* File ID of the startup file (HFS Plus only) */
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kHFSAttributesFileID = 8, /* File ID of the attribute file (HFS Plus only) */
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kHFSBogusExtentFileID = 15, /* Used for exchanging extents in extents file */
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kHFSFirstUserCatalogNodeID = 16
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};
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/* HFS catalog key */
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struct HFSCatalogKey {
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UInt8 keyLength; /* key length (in bytes) */
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UInt8 reserved; /* reserved (set to zero) */
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HFSCatalogNodeID parentID; /* parent folder ID */
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Str31 nodeName; /* catalog node name */
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};
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typedef struct HFSCatalogKey HFSCatalogKey;
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/* HFS Plus catalog key */
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struct HFSPlusCatalogKey {
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UInt16 keyLength; /* key length (in bytes) */
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HFSCatalogNodeID parentID; /* parent folder ID */
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HFSUniStr255 nodeName; /* catalog node name */
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};
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typedef struct HFSPlusCatalogKey HFSPlusCatalogKey;
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/* Catalog record types */
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enum {
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/* HFS Catalog Records */
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kHFSFolderRecord = 0x0100, /* Folder record */
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kHFSFileRecord = 0x0200, /* File record */
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kHFSFolderThreadRecord = 0x0300, /* Folder thread record */
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kHFSFileThreadRecord = 0x0400, /* File thread record */
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/* HFS Plus Catalog Records */
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kHFSPlusFolderRecord = 1, /* Folder record */
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kHFSPlusFileRecord = 2, /* File record */
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kHFSPlusFolderThreadRecord = 3, /* Folder thread record */
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kHFSPlusFileThreadRecord = 4 /* File thread record */
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};
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/* Catalog file record flags */
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enum {
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kHFSFileLockedBit = 0x0000, /* file is locked and cannot be written to */
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kHFSFileLockedMask = 0x0001,
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kHFSThreadExistsBit = 0x0001, /* a file thread record exists for this file */
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kHFSThreadExistsMask = 0x0002
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};
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/* HFS catalog folder record - 70 bytes */
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struct HFSCatalogFolder {
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SInt16 recordType; /* record type */
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UInt16 flags; /* folder flags */
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UInt16 valence; /* folder valence */
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HFSCatalogNodeID folderID; /* folder ID */
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UInt32 createDate; /* date and time of creation */
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UInt32 modifyDate; /* date and time of last modification */
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UInt32 backupDate; /* date and time of last backup */
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DInfo userInfo; /* Finder information */
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DXInfo finderInfo; /* additional Finder information */
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UInt32 reserved[4]; /* reserved - set to zero */
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};
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typedef struct HFSCatalogFolder HFSCatalogFolder;
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/* HFS Plus catalog folder record - 88 bytes */
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struct HFSPlusCatalogFolder {
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SInt16 recordType; /* record type = HFS Plus folder record */
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UInt16 flags; /* file flags */
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UInt32 valence; /* folder's valence (limited to 2^16 in Mac OS) */
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HFSCatalogNodeID folderID; /* folder ID */
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UInt32 createDate; /* date and time of creation */
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UInt32 contentModDate; /* date and time of last content modification */
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UInt32 attributeModDate; /* date and time of last attribute modification */
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UInt32 accessDate; /* date and time of last access (Rhapsody only) */
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UInt32 backupDate; /* date and time of last backup */
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HFSPlusPermissions permissions; /* permissions (for Rhapsody) */
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DInfo userInfo; /* Finder information */
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DXInfo finderInfo; /* additional Finder information */
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UInt32 textEncoding; /* hint for name conversions */
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UInt32 reserved; /* reserved - set to zero */
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};
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typedef struct HFSPlusCatalogFolder HFSPlusCatalogFolder;
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/* HFS catalog file record - 102 bytes */
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struct HFSCatalogFile {
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SInt16 recordType; /* record type */
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UInt8 flags; /* file flags */
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SInt8 fileType; /* file type (unused ?) */
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FInfo userInfo; /* Finder information */
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HFSCatalogNodeID fileID; /* file ID */
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UInt16 dataStartBlock; /* not used - set to zero */
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SInt32 dataLogicalSize; /* logical EOF of data fork */
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SInt32 dataPhysicalSize; /* physical EOF of data fork */
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UInt16 rsrcStartBlock; /* not used - set to zero */
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SInt32 rsrcLogicalSize; /* logical EOF of resource fork */
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SInt32 rsrcPhysicalSize; /* physical EOF of resource fork */
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UInt32 createDate; /* date and time of creation */
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UInt32 modifyDate; /* date and time of last modification */
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UInt32 backupDate; /* date and time of last backup */
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FXInfo finderInfo; /* additional Finder information */
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UInt16 clumpSize; /* file clump size (not used) */
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HFSExtentRecord dataExtents; /* first data fork extent record */
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HFSExtentRecord rsrcExtents; /* first resource fork extent record */
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UInt32 reserved; /* reserved - set to zero */
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};
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typedef struct HFSCatalogFile HFSCatalogFile;
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/* HFS Plus catalog file record - 248 bytes */
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struct HFSPlusCatalogFile {
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SInt16 recordType; /* record type = HFS Plus file record */
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UInt16 flags; /* file flags */
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UInt32 reserved1; /* reserved - set to zero */
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HFSCatalogNodeID fileID; /* file ID */
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UInt32 createDate; /* date and time of creation */
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UInt32 contentModDate; /* date and time of last content modification */
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UInt32 attributeModDate; /* date and time of last attribute modification */
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UInt32 accessDate; /* date and time of last access (Rhapsody only) */
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UInt32 backupDate; /* date and time of last backup */
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HFSPlusPermissions permissions; /* permissions (for Rhapsody) */
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FInfo userInfo; /* Finder information */
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FXInfo finderInfo; /* additional Finder information */
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UInt32 textEncoding; /* hint for name conversions */
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UInt32 reserved2; /* reserved - set to zero */
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/* start on double long (64 bit) boundry */
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HFSPlusForkData dataFork; /* size and block data for data fork */
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HFSPlusForkData resourceFork; /* size and block data for resource fork */
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};
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typedef struct HFSPlusCatalogFile HFSPlusCatalogFile;
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/* HFS catalog thread record - 46 bytes */
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struct HFSCatalogThread {
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SInt16 recordType; /* record type */
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SInt32 reserved[2]; /* reserved - set to zero */
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HFSCatalogNodeID parentID; /* parent ID for this catalog node */
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Str31 nodeName; /* name of this catalog node */
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};
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typedef struct HFSCatalogThread HFSCatalogThread;
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/* HFS Plus catalog thread record -- 264 bytes */
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struct HFSPlusCatalogThread {
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SInt16 recordType; /* record type */
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SInt16 reserved; /* reserved - set to zero */
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HFSCatalogNodeID parentID; /* parent ID for this catalog node */
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HFSUniStr255 nodeName; /* name of this catalog node (variable length) */
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};
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typedef struct HFSPlusCatalogThread HFSPlusCatalogThread;
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/*
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These are the types of records in the attribute B-tree. The values were chosen
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so that they wouldn't conflict with the catalog record types.
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*/
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enum {
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kHFSPlusAttrInlineData = 0x10, /* if size < kAttrOverflowSize */
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kHFSPlusAttrForkData = 0x20, /* if size >= kAttrOverflowSize */
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kHFSPlusAttrExtents = 0x30 /* overflow extents for large attributes */
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};
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/*
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HFSPlusAttrInlineData
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For small attributes, whose entire value is stored within this one
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B-tree record.
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There would not be any other records for this attribute.
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*/
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struct HFSPlusAttrInlineData {
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UInt32 recordType; /* = kHFSPlusAttrInlineData*/
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UInt32 reserved;
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UInt32 logicalSize; /* size in bytes of userData*/
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UInt8 userData[2]; /* variable length; space allocated is a multiple of 2 bytes*/
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};
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typedef struct HFSPlusAttrInlineData HFSPlusAttrInlineData;
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/*
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HFSPlusAttrForkData
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For larger attributes, whose value is stored in allocation blocks.
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If the attribute has more than 8 extents, there will be additonal
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records (of type HFSPlusAttrExtents) for this attribute.
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*/
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struct HFSPlusAttrForkData {
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UInt32 recordType; /* = kHFSPlusAttrForkData*/
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UInt32 reserved;
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HFSPlusForkData theFork; /* size and first extents of value*/
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};
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typedef struct HFSPlusAttrForkData HFSPlusAttrForkData;
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/*
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HFSPlusAttrExtents
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This record contains information about overflow extents for large,
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fragmented attributes.
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*/
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struct HFSPlusAttrExtents {
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UInt32 recordType; /* = kHFSPlusAttrExtents*/
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UInt32 reserved;
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HFSPlusExtentRecord extents; /* additional extents*/
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};
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typedef struct HFSPlusAttrExtents HFSPlusAttrExtents;
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/* A generic Attribute Record*/
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union HFSPlusAttrRecord {
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UInt32 recordType;
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HFSPlusAttrInlineData inlineData;
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HFSPlusAttrForkData forkData;
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HFSPlusAttrExtents overflowExtents;
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};
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typedef union HFSPlusAttrRecord HFSPlusAttrRecord;
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/* Key and node lengths */
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enum {
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kHFSPlusExtentKeyMaximumLength = sizeof(HFSPlusExtentKey) - sizeof(UInt16),
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kHFSExtentKeyMaximumLength = sizeof(HFSExtentKey) - sizeof(UInt8),
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kHFSPlusCatalogKeyMaximumLength = sizeof(HFSPlusCatalogKey) - sizeof(UInt16),
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kHFSPlusCatalogKeyMinimumLength = kHFSPlusCatalogKeyMaximumLength - sizeof(HFSUniStr255) + sizeof(UInt16),
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kHFSCatalogKeyMaximumLength = sizeof(HFSCatalogKey) - sizeof(UInt8),
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kHFSCatalogKeyMinimumLength = kHFSCatalogKeyMaximumLength - sizeof(Str31) + sizeof(UInt8),
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kHFSPlusCatalogMinNodeSize = 4096,
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kHFSPlusExtentMinNodeSize = 512,
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kHFSPlusAttrMinNodeSize = 4096
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};
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/* HFS and HFS Plus volume attribute bits */
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enum {
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/* Bits 0-6 are reserved (always cleared by MountVol call) */
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kHFSVolumeHardwareLockBit = 7, /* volume is locked by hardware */
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kHFSVolumeUnmountedBit = 8, /* volume was successfully unmounted */
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kHFSVolumeSparedBlocksBit = 9, /* volume has bad blocks spared */
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kHFSVolumeNoCacheRequiredBit = 10, /* don't cache volume blocks (i.e. RAM or ROM disk) */
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kHFSBootVolumeInconsistentBit = 11, /* boot volume is inconsistent (System 7.6 and later) */
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/* Bits 12-14 are reserved for future use */
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kHFSVolumeSoftwareLockBit = 15, /* volume is locked by software */
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kHFSVolumeHardwareLockMask = 1 << kHFSVolumeHardwareLockBit,
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kHFSVolumeUnmountedMask = 1 << kHFSVolumeUnmountedBit,
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kHFSVolumeSparedBlocksMask = 1 << kHFSVolumeSparedBlocksBit,
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kHFSVolumeNoCacheRequiredMask = 1 << kHFSVolumeNoCacheRequiredBit,
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kHFSBootVolumeInconsistentMask = 1 << kHFSBootVolumeInconsistentBit,
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kHFSVolumeSoftwareLockMask = 1 << kHFSVolumeSoftwareLockBit,
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kHFSMDBAttributesMask = 0x8380
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};
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/* Master Directory Block (HFS only) - 162 bytes */
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/* Stored at sector #2 (3rd sector) */
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struct HFSMasterDirectoryBlock {
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/* These first fields are also used by MFS */
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UInt16 drSigWord; /* volume signature */
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UInt32 drCrDate; /* date and time of volume creation */
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UInt32 drLsMod; /* date and time of last modification */
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UInt16 drAtrb; /* volume attributes */
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UInt16 drNmFls; /* number of files in root folder */
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UInt16 drVBMSt; /* first block of volume bitmap */
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UInt16 drAllocPtr; /* start of next allocation search */
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UInt16 drNmAlBlks; /* number of allocation blocks in volume */
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UInt32 drAlBlkSiz; /* size (in bytes) of allocation blocks */
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UInt32 drClpSiz; /* default clump size */
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UInt16 drAlBlSt; /* first allocation block in volume */
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UInt32 drNxtCNID; /* next unused catalog node ID */
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UInt16 drFreeBks; /* number of unused allocation blocks */
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Str27 drVN; /* volume name */
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/* Master Directory Block extensions for HFS */
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UInt32 drVolBkUp; /* date and time of last backup */
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UInt16 drVSeqNum; /* volume backup sequence number */
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UInt32 drWrCnt; /* volume write count */
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UInt32 drXTClpSiz; /* clump size for extents overflow file */
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UInt32 drCTClpSiz; /* clump size for catalog file */
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UInt16 drNmRtDirs; /* number of directories in root folder */
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UInt32 drFilCnt; /* number of files in volume */
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UInt32 drDirCnt; /* number of directories in volume */
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SInt32 drFndrInfo[8]; /* information used by the Finder */
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UInt16 drEmbedSigWord; /* embedded volume signature (formerly drVCSize) */
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HFSExtentDescriptor drEmbedExtent; /* embedded volume location and size (formerly drVBMCSize and drCtlCSize) */
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UInt32 drXTFlSize; /* size of extents overflow file */
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HFSExtentRecord drXTExtRec; /* extent record for extents overflow file */
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UInt32 drCTFlSize; /* size of catalog file */
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HFSExtentRecord drCTExtRec; /* extent record for catalog file */
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};
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typedef struct HFSMasterDirectoryBlock HFSMasterDirectoryBlock;
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/* HFSPlusVolumeHeader (HFS Plus only) - 512 bytes */
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/* Stored at sector #2 (3rd sector) and second-to-last sector. */
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struct HFSPlusVolumeHeader {
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UInt16 signature; /* volume signature == 'H+' */
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UInt16 version; /* current version is kHFSPlusVersion */
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UInt32 attributes; /* volume attributes */
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UInt32 lastMountedVersion; /* implementation version which last mounted volume */
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UInt32 reserved; /* reserved - set to zero */
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UInt32 createDate; /* date and time of volume creation */
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UInt32 modifyDate; /* date and time of last modification */
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UInt32 backupDate; /* date and time of last backup */
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UInt32 checkedDate; /* date and time of last disk check */
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UInt32 fileCount; /* number of files in volume */
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UInt32 folderCount; /* number of directories in volume */
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UInt32 blockSize; /* size (in bytes) of allocation blocks */
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UInt32 totalBlocks; /* number of allocation blocks in volume (includes this header and VBM*/
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UInt32 freeBlocks; /* number of unused allocation blocks */
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UInt32 nextAllocation; /* start of next allocation search */
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UInt32 rsrcClumpSize; /* default resource fork clump size */
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UInt32 dataClumpSize; /* default data fork clump size */
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HFSCatalogNodeID nextCatalogID; /* next unused catalog node ID */
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UInt32 writeCount; /* volume write count */
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UInt64 encodingsBitmap; /* which encodings have been use on this volume */
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UInt8 finderInfo[32]; /* information used by the Finder */
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HFSPlusForkData allocationFile; /* allocation bitmap file */
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HFSPlusForkData extentsFile; /* extents B-tree file */
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HFSPlusForkData catalogFile; /* catalog B-tree file */
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HFSPlusForkData attributesFile; /* extended attributes B-tree file */
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HFSPlusForkData startupFile; /* boot file */
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};
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typedef struct HFSPlusVolumeHeader HFSPlusVolumeHeader;
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/* ---------- HFS and HFS Plus B-tree structures ---------- */
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/* BTNodeDescriptor -- Every B-tree node starts with these fields. */
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struct BTNodeDescriptor {
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UInt32 fLink; /* next node at this level*/
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UInt32 bLink; /* previous node at this level*/
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SInt8 kind; /* kind of node (leaf, index, header, map)*/
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UInt8 height; /* zero for header, map; child is one more than parent*/
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UInt16 numRecords; /* number of records in this node*/
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|
UInt16 reserved; /* reserved; set to zero*/
|
|
};
|
|
typedef struct BTNodeDescriptor BTNodeDescriptor;
|
|
/* Constants for BTNodeDescriptor kind */
|
|
enum {
|
|
kBTLeafNode = -1,
|
|
kBTIndexNode = 0,
|
|
kBTHeaderNode = 1,
|
|
kBTMapNode = 2
|
|
};
|
|
|
|
/* BTHeaderRec -- The first record of a B-tree header node */
|
|
struct BTHeaderRec {
|
|
UInt16 treeDepth; /* maximum height (usually leaf nodes)*/
|
|
UInt32 rootNode; /* node number of root node*/
|
|
UInt32 leafRecords; /* number of leaf records in all leaf nodes*/
|
|
UInt32 firstLeafNode; /* node number of first leaf node*/
|
|
UInt32 lastLeafNode; /* node number of last leaf node*/
|
|
UInt16 nodeSize; /* size of a node, in bytes*/
|
|
UInt16 maxKeyLength; /* reserved*/
|
|
UInt32 totalNodes; /* total number of nodes in tree*/
|
|
UInt32 freeNodes; /* number of unused (free) nodes in tree*/
|
|
UInt16 reserved1; /* unused*/
|
|
UInt32 clumpSize; /* reserved*/
|
|
UInt8 btreeType; /* reserved*/
|
|
UInt8 reserved2; /* reserved*/
|
|
UInt32 attributes; /* persistent attributes about the tree*/
|
|
UInt32 reserved3[16]; /* reserved*/
|
|
};
|
|
typedef struct BTHeaderRec BTHeaderRec;
|
|
/* Constants for BTHeaderRec attributes */
|
|
enum {
|
|
kBTBadCloseMask = 0x00000001, /* reserved*/
|
|
kBTBigKeysMask = 0x00000002, /* key length field is 16 bits*/
|
|
kBTVariableIndexKeysMask = 0x00000004 /* keys in index nodes are variable length*/
|
|
};
|
|
|
|
|
|
#if PRAGMA_STRUCT_ALIGN
|
|
#pragma options align=reset
|
|
#elif PRAGMA_STRUCT_PACKPUSH
|
|
#pragma pack(pop)
|
|
#elif PRAGMA_STRUCT_PACK
|
|
#pragma pack()
|
|
#endif
|
|
|
|
#ifdef PRAGMA_IMPORT_OFF
|
|
#pragma import off
|
|
#elif PRAGMA_IMPORT
|
|
#pragma import reset
|
|
#endif
|
|
|
|
|
|
#endif /* __HFSVOLUMES__ */
|
|
|