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https://github.com/elliotnunn/sys7.1-doc-wip.git
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553 lines
20 KiB
C
553 lines
20 KiB
C
/*------------------------------------------------------------------------------
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File: HFSDefs.h
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Contains: HFS data structure definitions.
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Written by: Bill Bruffey
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Copyright: © 1986-1990 by Apple Computer, Inc., all rights reserved.
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Change History (most recent first):
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<2> 6/16/90 PK cleaning up
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<1> 6/14/90 PK first checked in
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29 May 90 PK Added BB_FNum and VAtrb_BB for sparing
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6 Jul 89 EN Added cdrFThdRec for FileIDs support for BigBang. (changed comments too)
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10 May 86 BB New today.
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To Do:
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------------------------------------------------------------------------------*/
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/*------------------------------------------------------------------------------
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Misc constants
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------------------------------------------------------------------------------*/
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#define HFS_SigW 0x4244 /* HFS signature bytes */
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#define NxFreeFN 16 /* 1st free file number for user files */
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#define NxFreeDID 3 /* 1st free directory ID for user directories */
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#define FSRtDirID 2 /* directory ID fo root directory */
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#define AlBlkSize 512 /* default allocation block size (bytes) */
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#define ClpSize (4*512) /* default clump size (bytes) */
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#define MDB_FNum 1 /* file number representing the MDB */
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#define AMDB_FNum -1 /* file number representing the alternate MDB */
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#define VBM_FNum 2 /* file number representing the volume bit map */
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#define Ext_FNum 3 /* file number for the Extent file */
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#define Cat_FNum 4 /* file number for the Catalog file */
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#define BB_FNum 5 /* file number for the Bad Block extents */
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#define MDB_BlkN 2 /* logical block number for the MDB */
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#define Vol_RefN (-1) /* refnum of volume being scavenged */
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#define Ext_RefN 0x02 /* extent file refnum */
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#define Cat_RefN 0x60 /* extent file refnum */
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#define Max_XKey 7 /* max extent file key length */
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#define Max_CKey 37 /* max catalog file key length */
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#define Max_VName 27 /* max volume name length */
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#define Max_ABSiz 0xFFFF /* max allocation block size (64K - 1) */
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#define Max_ABlks 0xFFFF /* max number of allocation blocks (64K - 1) */
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#define Blk_Size 512 /* size of a logical block */
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#define Num_CBufs 32 /* number of cache buffers */
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#define CBuf_Size 512 /* cache buffer size */
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#define VAtrb_Msk 0x7C7F /* volume attribute mask - invalid bits */
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#define VAtrb_BB 0x0200 /* bad blocks have been spared */
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#define VAtrb_DFlt 0x0100 /* default volume attribute flags */
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#define VAtrb_Cons 0x0100 /* volume consistency flag */
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/*------------------------------------------------------------------------------
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BTree data structures
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------------------------------------------------------------------------------*/
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/* misc BTree constants */
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#define BTNodeSize 512 /* default node size */
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#define BTMaxDepth 8 /* max tree depth */
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#define Num_HRecs 3 /* number of records in BTree Header node */
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#define Num_MRecs 1 /* number of records in BTree Map node */
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/* the records in the BTree Header node are: */
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#define HRec_BTH 1 /* record 1: the BTree header record */
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#define HRec_Unused 2 /* record 2: 128 unused 'user' bytes */
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#define HRec_Map 3 /* record 3: the initial 256 byte bitmap */
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/*
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* Scavenger BTree Control Block (SBTCB)
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*/
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typedef struct SBTCB {
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unsigned char BTCFlags; /* flags */
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char BTCResv; /* reserved */
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short BTCRefNum; /* file refnum */
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ProcPtr BTCKeyCR; /* pointer to ext key compare routine */
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Ptr BTCCQPtr; /* pointer to cache queue */
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Ptr BTCVarPtr; /* pointer to BTree variables */
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short BTCLevel; /* current level */
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long BTCNodeM; /* current node mark */
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short BTCIndexM; /* current index mark */
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/* this part of a BTCB is the memory resident portion of the BTH */
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short BTCDepth; /* current depth of tree */
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long BTCRoot; /* root node number */
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long BTCNRecs; /* number of leaf records in BTree */
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long BTCFNode; /* node number of 1st leaf node */
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long BTCLNode; /* node number of last leaf node */
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short BTCNodeSize; /* BTree node size in bytes */
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short BTCKeyLen; /* max key length */
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long BTCNNodes; /* total number of nodes */
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long BTCFree; /* number of free nodes */
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/* Scavenger extensions to the HFS BTCB */
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Ptr BTCBMPtr; /* pointer to scavenger BTree bit map */
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Ptr BTCFCBAPtr; /* pointer to scavenger FCB array */
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} SBTCB, *SBTCBPtr;
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#define LenBTCB 54 /* length of a HFS BTCB */
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#define LenSBTCB 62 /* length of a Scavenger BTCB */
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/* BTCB flag definitions (contents of BTCFlags) */
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#define BTCDirty 128 /* dirty flag */
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#define BTCKeyUpd 64 /* index key update required */
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#define BTCNewIRec 32 /* new index record required */
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#define BTCDelIRec 16 /* index record delete required */
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/*
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* BTree Header (BTH) on disk
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*/
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typedef struct BTH {
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short BTHDepth; /* current depth of tree */
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long BTHRoot; /* root node number */
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long BTHNRecs; /* number of leaf records in BTree */
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long BTHFNode; /* node number of 1st leaf node */
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long BTHLNode; /* node number of last leaf node */
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short BTHNodeSize; /* BTree node size in bytes */
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short BTHKeyLen; /* max key length */
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long BTHNNodes; /* total number of nodes */
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long BTHFree; /* number of free nodes */
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} BTH, *BTHPtr;
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#define LenMemBTH 30 /* length of memory resident portion of BTH */
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#define LenBTH 106 /* length of a BTH */
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/*
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* Node Descriptor (prefix ND)
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*/
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typedef struct ND {
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long NDFlink; /* forward link */
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long NDBlink; /* backward link */
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char NDType; /* node type */
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char NDNHeight; /* node height */
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short NDNRecs; /* number of records */
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short NDResv2; /* reserved */
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} ND, *NDPtr;
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#define lenND 14 /* length of node descriptor */
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/* node types (contents of NDType) */
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#define NDHdrNode 1 /* header node */
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#define NDMapNode 2 /* map node */
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#define NDIndxNode 0 /* index node */
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#define NDLeafNode (-1) /* leaf node */
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/*
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* Scavenger BTree Path Record (STPR)
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*/
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typedef struct STPR {
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long TPRNodeN; /* node number */
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short TPRRIndx; /* record index */
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short Unused; /* not used - makes debugging easier */
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long TPRLtSib; /* node number of left sibling node */
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long TPRRtSib; /* node number of right sibling node */
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} STPR, *STPRPtr;
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typedef STPR SBTPT[BTMaxDepth]; /* BTree path table */
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#define LenSTPR 16 /* length of Tree Path Record */
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#define LenSBTPT (LenSTPR*BTMaxDepth) /* length of BTree Path Table */
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/*------------------------------------------------------------------------------
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FXM (File Extents Manager) data structures
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------------------------------------------------------------------------------*/
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/*
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* ExtendFile option flags
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*/
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#define EFContig 2 /* force contiguous allocation */
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#define EFAll 1 /* allocate all requested bytes or none */
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/*
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* TruncateFile option flags
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*/
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#define TFTrunExt 1 /* truncate to the extent containing new PEOF */
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/*
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* extent key record (prefix xkr)
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*/
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typedef struct xkr {
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unsigned char xkrKeyLen; /* key length (byte) */
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unsigned char xkrFkType; /* fork type (byte) */
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/* $00 = data fork */
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/* $FF = resource fork */
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long xkrFNum; /* file number (long) */
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unsigned short xkrFABN; /* starting file allocation block number (word) */
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} xkr, *xkrPtr;
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#define Lenxkr 8 /* length of a xkr */
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/*
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* extent entry (prefix ext)
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*/
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typedef struct ext {
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unsigned short extStABN; /* starting physical allocation block number (word) */
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unsigned short extNumABlks; /* number of allocation blocks (word) */
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} ext;
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/*
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* extent data record (prefix xdr)
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*/
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#define NumExts 3 /* number of extents per record */
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typedef ext xdr[NumExts]; /* xdr = (3 extent entries) */
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/*------------------------------------------------------------------------------
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CM (Catalog Manager) data structures
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------------------------------------------------------------------------------*/
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/*
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* Misc constants
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*/
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#define CMMaxKey 37 /* max catalog key length */
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#define CMMaxCName 31 /* max CName length */
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#define CMMaxDepth 64 /* max catalog depth */
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#define CMClpSize 20 /* catalog clump size */
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/*
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* CNode types
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*/
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#define CMDirCN 1 /* directory CNode */
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#define CMFilCN 2 /* file CNode */
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/*
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* catalog key record (prefix ckr)
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*/
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typedef struct ckr {
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unsigned char ckrKeyLen; /* key length (byte) */
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char ckrResrv1; /* reserved (byte) */
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long ckrParID; /* parent directory ID (long) */
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unsigned char ckrCName[32]; /* CNode name (str31) */
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} ckr, *ckrPtr;
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#define Lenckr 38 /* length of a ckr */
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/*
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* catalog data record (prefix cdr)
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*/
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typedef struct cdr {
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char cdrType; /* record type (byte) */
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char cdrResrv; /* reserved (byte) */
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} cdr, *cdrPtr;
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#define cdrData 2 /* start of catalog record data */
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/*
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* catalog directory record (prefix dir)
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*/
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typedef struct dir {
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char cdrType; /* record type (byte) */
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char cdrResrv; /* reserved (byte) */
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unsigned short dirFlags; /* flags (word) */
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short dirVal; /* valence (word) */
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long dirDirID; /* DirID for this directory (long) */
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unsigned long dirCrDat; /* date/time created (long) */
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unsigned long dirMdDat; /* date/time last modified (long) */
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unsigned long dirBkDat; /* date/time last backed up (long) */
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char dirUsrInfo[16]; /* User info bytes (16 bytes) */
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FInfo dirFndrInfo; /* Finder Info bytes (16 bytes) */
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char dirResrv[16]; /* reserved (16 bytes) */
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} dir;
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#define Lendir 70 /* length of a directory record */
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/*
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* catalog thread record (prefix thd)
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*/
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typedef struct thd {
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char cdrType; /* record type (byte) */
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char cdrResrv; /* reserved (byte) */
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char thdResrv[8]; /* reserved (8 bytes) */
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long thdParID; /* Parent ID for this directory (long) */
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unsigned char thdCName[32]; /* CName for this directory (str31) */
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} thd;
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#define Lenthd 46 /* length of a thread record */
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/*
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* catalog file record (prefix fil)
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*/
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typedef struct fil {
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char cdrType; /* record type (byte) */
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char cdrResrv; /* reserved (byte) */
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unsigned char filFlags; /* bit 7=1 (used), bit 0=file lock flag, bit 1=file thread flag */
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char filTyp; /* file type (used as a name extension) */
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char filUsrWds[16]; /* user words for file. (16 bytes) */
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long filFlNum; /* file number */
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short filStBlk; /* Start file block (alloc blk size)(0000 if none) */
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long filLgLen; /* File logical length in bytes (EOF) */
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long filPyLen; /* File physical length in bytes */
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short filRStBlk; /* Start file block, resource fork (0000 if none) */
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long filRLgLen; /* File logical length (EOF), resource fork */
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long filRPyLen; /* File physical length, resource fork */
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unsigned long filCrDat; /* date/time created (long) */
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unsigned long filMdDat; /* date/time last modified (long) */
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unsigned long filBkDat; /* date/time last backed up (long) */
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char filFndrInfo[16]; /* Additional finder info for file (16 bytes) */
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short filClpSize; /* file clump size (word) */
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xdr filExtRec; /* First 3 data fork extents (12 bytes) */
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xdr filRExtRec; /* First 3 resource fork extents (12 bytes) */
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long filResrv; /* reserved (4 bytes) */
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} fil;
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#define Lenfil 102 /* length of a file record */
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#define Lencdr Lenfil /* max length of a catalog data record */
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/* catalog data record types (varients) */
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#define cdrDirRec CMDirCN /* directory record (directory CNode type) */
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#define cdrFilRec CMFilCN /* file record (file CNode type) */
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#define cdrThdRec 3 /* thread record */
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#define cdrFThdRec 4 /* file thread record */
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/*
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* Scavenger Directory Path Record (SDPR)
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*/
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typedef struct SDPR {
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long DirID; /* directory ID */
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short OffIndx; /* offspring index */
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long DirHint; /* BTree hint for directory record */
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long ThdHint; /* BTree hint for thread record */
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long ParID; /* parent directory ID */
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unsigned char DirCName[32]; /* directory CName */
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} SDPR;
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typedef SDPR SDPT[CMMaxDepth]; /* directory path table */
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#define LenSDPR 50 /* length of Directory Path Record */
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#define LenSDPT (LenSDPR*CMMaxDepth) /* length of Tree Path Table */
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/*------------------------------------------------------------------------------
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Scavenger VCB (SVCB)
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------------------------------------------------------------------------------*/
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typedef struct SVCB {
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struct QElem *qLink; /* link to next VCB */
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short qType; /* queue type */
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unsigned short VCBFlags; /* VCB flags */
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unsigned short VCBSigWord; /* signature word */
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unsigned long VCBCrDate; /* Creation date */
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unsigned long VCBLsMod; /* last backup date */
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unsigned short VCBAtrb; /* volume attributes. bit 15=write(locked=1) */
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unsigned short VCBNmFls; /* number files in root directory */
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short VCBVBMSt; /* starting sector of allocation map (overlaps) */
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unsigned short VCBAllocPtr; /* Start of next allocation search */
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unsigned short VCBNmAlBlks; /* number of blocks (of alloc size) this volume */
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long VCBAlBlkSiz; /* min num of bytes to allocate (must be 512 mult) */
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long VCBClpSiz; /* num of bytes to try to alloc as a clump */
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short VCBAlBlSt; /* starting diskette (512-byte) block in block map */
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long VCBNxtCNID; /* Next CNode identifier */
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unsigned short VCBFreeBks; /* number of free blocks on this volume */
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unsigned char VCBVN[Max_VName+1]; /* volume name (including name length) */
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short VCBDrvNum; /* drive number for this VCB */
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short VCBDRefNum; /* driver refnum for this VCB */
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short VCBFSID; /* ID of file system handling this volume */
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short VCBVRefNum; /* unique refnum for this VCB */
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Ptr VCBMAdr; /* volume map address (MFS volume) */
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Ptr VCBBufAdr; /* volume buffer address */
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short VCBMLen; /* length of voume map (MFS volume) */
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short VCBDirIndex; /* directory index and block number */
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short VCBDirBlk; /* (used by GetFileInfo searches by index) */
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/* VCB extensions for HFS (copied from the MDB) */
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unsigned long VCBVolBkup; /* date volume was last backed up */
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short VCBVSeqNum; /* index of volume in backup set */
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unsigned long VCBWrCnt; /* volume write count */
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long VCBXTClpSiz; /* extent file clump size */
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long VCBCTClpSiz; /* catalog file clump size */
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short VCBNmRtDirs; /* number of directories in root */
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long VCBFilCnt; /* total number of files on volume */
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long VCBDirCnt; /* total number of directories on volume */
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char VCBFndrInfo[32]; /* Finder info for volume */
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short VCBVCSize; /* Volume cache size in blocks */
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short VCBVBMCSize; /* volume bitmap cache size in blocks */
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short VCBCtlCSize; /* control (BTree) cache size in blocks */
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/* VCB extensions for HFS (not copied from the MDB) */
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short VCBXTAlBlks; /* size of extent BTree in alloc blocks */
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short VCBCTAlBlks; /* size of catalog BTree in alloc blocks */
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short VCBXTRef; /* file refnum for extent file */
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short VCBCTRef; /* file refnum for catalog file */
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Ptr VCBCtlBuf; /* pointer to control (BTree) cache */
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long VCBDirIDM; /* directory last searched ( 0 if invalid) */
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short VCBOffsM; /* offspring index at last search */
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/* Scavenger extensions to the HFS VCB */
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short VCBRWErr; /* last read/write error on volume */
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Ptr VCBBMPtr; /* pointer to scavenger volume bit map */
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Ptr VCBFCBAPtr; /* pointer to scavenger FCB array */
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} SVCB, *SVCBPtr;
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#define LenSVCB 188 /* length of a Scavenger VCB */
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/*------------------------------------------------------------------------------
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Master Directory Block (MDB) on disk
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------------------------------------------------------------------------------*/
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typedef struct MDB {
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unsigned short DrSigWord; /* signature word */
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unsigned long DrCrDate; /* Creation date */
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unsigned long DrLsMod; /* last backup date */
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unsigned short DrAtrb; /* volume attributes. bit 15=write(locked=1) */
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unsigned short DrNmFls; /* number files in root directory */
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short DrVBMSt; /* starting sector of allocation map (overlaps) */
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short DrAllocPtr; /* Start of next allocation search */
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unsigned short DrNmAlBlks; /* number of blocks (of alloc size) this volume */
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long DrAlBlkSiz; /* min num of bytes to allocate (must be 512 mult) */
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long DrClpSiz; /* num of bytes to try to alloc as a clump */
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short DrAlBlSt; /* starting diskette (512-byte) block in block map */
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long DrNxtCNID; /* Next CNode identifier */
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unsigned short DrFreeBks; /* number of free blocks on this volume */
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unsigned char DrVN[Max_VName+1]; /* volume name (including name length) */
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/* Master Directory Block extensions for HFS */
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unsigned long DrVolBkup; /* Date of last volume backup */
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short DrVSeqNum; /* Sequence number of volume within backup set */
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unsigned long DrWrCnt; /* Volume write count */
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long DrXTClpSiz; /* extent B*-Tree clump size */
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long DrCTClpSiz; /* Catalog B*-Tree clump size */
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short DrNmRtDirs; /* Number of subdirectories in the root */
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long DrFilCnt; /* Total number of files in volume */
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long DrDirCnt; /* Total number of directories in volume */
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char DrFndrInfo[32]; /* Finder info for volume */
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short DrVCSize; /* Volume cache size */
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short DrVBMCSize; /* Volume Bitmap cache size */
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short DrCtlCSize; /* Size of common volume cache */
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/* Information not copied into VCB */
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long DrXTFlSize; /* Length of extent B*-Tree (LEOF and PEOF) */
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xdr DrXTExtRec; /* First (and only) extent-tree extent record */
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long DrCTFlSize; /* Length of catalog B*-Tree (LEOF and PEOF) */
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xdr DrCTExtRec; /* First catalog extent record */
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char reserved[94]; /* reserved */
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char DrUsrInfo[256]; /* User information for volume */
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} MDB, *MDBPtr;
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#define LenMDB 162 /* length of full MDB */
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#define LenMFSMDB 64 /* length of VCB data from MDB (MFS) */
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#define LenHFSMDB 66 /* length of additional VCB data from MDB (HFS) */
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/*------------------------------------------------------------------------------
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Scavenger File Control Block (SFCB) in memory
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------------------------------------------------------------------------------*/
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typedef struct SFCB {
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long FCBFlNm; /* FCB file number. Non-zero marks FCB used */
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unsigned char FCBFlags; /* FCB flags */
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unsigned char FCBTypByt; /* file type byte */
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short FCBSBlk; /* File start block (in alloc size blks) */
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long FCBEOF; /* logical length or EOF in bytes */
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long FCBPLen; /* Physical file length in bytes */
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long FCBCrPs; /* current position within file */
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SVCBPtr FCBVPtr; /* Absolute pointer to the corresponding VCB */
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Ptr FCBBfAdr; /* file's buffer address */
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short FCBFlPos; /* directory block this file is in */
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/* FCB Extensions for HFS */
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long FCBClmpSize; /* Number of bytes per clump */
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SBTCBPtr FCBBTCBPtr; /* pointer to B*-Tree control block for this file */
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xdr FCBExtRec; /* First 3 file extents */
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long FCBFType; /* file's 4 Finder Type bytes */
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long FCBCatPos; /* Catalog hint for use on Close */
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long FCBDirID; /* Parent Directory ID */
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unsigned char FCBCName[32]; /* CName of open file Str(31) */
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} SFCB, *SFCBPtr;
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#define LenSFCB 94 /* length of a SFCB */
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/* FCB flag definitions (contents of FCBFlags) */
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#define FCBModBit 128 /* dirty bit for FCB entry */
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#define FCBRscBit 2 /* 1 if this is resource fork */
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/*------------------------------------------------------------------------------
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Low-level File System Error codes
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------------------------------------------------------------------------------*/
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/* Cache errors */
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#define ChNoBuf 1 /* no free cache buffers (all in use) */
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#define ChInUse 2 /* requested block in use */
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#define Chnotfound 3 /* requested block not found */
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#define ChNotInUse 4 /* block being released was not in use */
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/* FXM Internal error codes */
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#define FXRangeErr 16 /* file position beyond mapped range */
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#define FXOvFlErr 17 /* extents file overflow */
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/* BTree error codes */
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#define BTnotfound 32 /* record not found */
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#define BTexists 33 /* record already exists */
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#define BTnospace 34 /* no available space */
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#define BTnoFit 35 /* record doesn't fit in node */
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#define BTbadNode 36 /* bad node detected */
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#define BTbadHdr 37 /* bad BTree header record detected */
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#define dsBadRotate 64 /* bad BTree rotate */
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/* CM error codes */
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#define CMnotfound 48 /* CNode not found */
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#define CMexists 49 /* CNode already exists */
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#define CMnotempty 50 /* directory CNode not empty (valence = 0) */
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#define CMRootCN 51 /* invalid reference to root CNode */
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#define CMbadnews 52 /* detected bad catalog structure */
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