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https://github.com/zydeco/minivmac4ios.git
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228 lines
7.3 KiB
C
228 lines
7.3 KiB
C
/*
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* libhfs - library for reading and writing Macintosh HFS volumes
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* Copyright (C) 1996-1998 Robert Leslie
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: libhfs.h,v 1.7 1998/11/02 22:09:02 rob Exp $
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*/
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# include "hfs.h"
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# include "apple.h"
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extern int errno;
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# define ERROR(code, str) \
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do { hfs_error = (str), errno = (code); goto fail; } while (0)
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# ifdef DEBUG
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# define ASSERT(cond) do { if (! (cond)) abort(); } while (0)
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# else
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# define ASSERT(cond) /* nothing */
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# endif
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# define SIZE(type, n) ((size_t) (sizeof(type) * (n)))
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# define ALLOC(type, n) ((type *) malloc(SIZE(type, n)))
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# define ALLOCX(type, n) ((n) ? ALLOC(type, n) : (type *) 0)
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# define FREE(ptr) ((ptr) ? (void) free((void *) ptr) : (void) 0)
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# define REALLOC(ptr, type, n) \
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((type *) ((ptr) ? realloc(ptr, SIZE(type, n)) : malloc(SIZE(type, n))))
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# define REALLOCX(ptr, type, n) \
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((n) ? REALLOC(ptr, type, n) : (FREE(ptr), (type *) 0))
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# define BMTST(bm, num) \
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(((const byte *) (bm))[(num) >> 3] & (0x80 >> ((num) & 0x07)))
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# define BMSET(bm, num) \
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(((byte *) (bm))[(num) >> 3] |= (0x80 >> ((num) & 0x07)))
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# define BMCLR(bm, num) \
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(((byte *) (bm))[(num) >> 3] &= ~(0x80 >> ((num) & 0x07)))
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# define STRINGIZE(x) #x
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# define STR(x) STRINGIZE(x)
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typedef unsigned char byte;
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typedef byte block[HFS_BLOCKSZ];
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typedef struct _bucket_ {
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int flags; /* bit flags */
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unsigned int count; /* number of times this block is requested */
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unsigned long bnum; /* logical block number */
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block *data; /* pointer to block contents */
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struct _bucket_ *cnext; /* next bucket in cache chain */
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struct _bucket_ *cprev; /* previous bucket in cache chain */
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struct _bucket_ *hnext; /* next bucket in hash chain */
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struct _bucket_ **hprev; /* previous bucket's pointer to this bucket */
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} bucket;
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# define HFS_BUCKET_INUSE 0x01
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# define HFS_BUCKET_DIRTY 0x02
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# define HFS_CACHESZ 128
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# define HFS_HASHSZ 32
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# define HFS_BLOCKBUFSZ 16
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typedef struct {
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struct _hfsvol_ *vol; /* volume to which cache belongs */
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bucket *tail; /* end of bucket chain */
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unsigned int hits; /* number of cache hits */
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unsigned int misses; /* number of cache misses */
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bucket chain[HFS_CACHESZ]; /* cache bucket chain */
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bucket *hash[HFS_HASHSZ]; /* hash table for bucket chain */
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block pool[HFS_CACHESZ]; /* physical blocks in cache */
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} bcache;
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# define HFS_MAP1SZ 256
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# define HFS_MAPXSZ 492
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# define HFS_NODEREC(nd, rnum) ((nd).data + (nd).roff[rnum])
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# define HFS_RECLEN(nd, rnum) ((nd).roff[(rnum) + 1] - (nd).roff[rnum])
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# define HFS_RECKEYLEN(ptr) (*(const byte *) (ptr))
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# define HFS_RECKEYSKIP(ptr) ((size_t) ((1 + HFS_RECKEYLEN(ptr) + 1) & ~1))
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# define HFS_RECDATA(ptr) ((ptr) + HFS_RECKEYSKIP(ptr))
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# define HFS_SETKEYLEN(ptr, x) (*(byte *) (ptr) = (x))
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# define HFS_CATDATALEN sizeof(CatDataRec)
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# define HFS_EXTDATALEN sizeof(ExtDataRec)
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# define HFS_MAX_DATALEN (HFS_CATDATALEN > HFS_EXTDATALEN ? \
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HFS_CATDATALEN : HFS_EXTDATALEN)
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# define HFS_CATKEYLEN sizeof(CatKeyRec)
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# define HFS_EXTKEYLEN sizeof(ExtKeyRec)
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# define HFS_MAX_KEYLEN (HFS_CATKEYLEN > HFS_EXTKEYLEN ? \
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HFS_CATKEYLEN : HFS_EXTKEYLEN)
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# define HFS_MAX_CATRECLEN (HFS_CATKEYLEN + HFS_CATDATALEN)
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# define HFS_MAX_EXTRECLEN (HFS_EXTKEYLEN + HFS_EXTDATALEN)
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# define HFS_MAX_RECLEN (HFS_MAX_KEYLEN + HFS_MAX_DATALEN)
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# define HFS_SIGWORD 0x4244
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# define HFS_SIGWORD_MFS ((Integer) 0xd2d7)
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# define HFS_ATRB_BUSY (1 << 6)
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# define HFS_ATRB_HLOCKED (1 << 7)
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# define HFS_ATRB_UMOUNTED (1 << 8)
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# define HFS_ATRB_BBSPARED (1 << 9)
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# define HFS_ATRB_BVINCONSIS (1 << 11)
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# define HFS_ATRB_COPYPROT (1 << 14)
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# define HFS_ATRB_SLOCKED (1 << 15)
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struct _hfsfile_ {
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struct _hfsvol_ *vol; /* pointer to volume descriptor */
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unsigned long parid; /* parent directory ID of this file */
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char name[HFS_MAX_FLEN + 1]; /* catalog name of this file */
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CatDataRec cat; /* catalog information */
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ExtDataRec ext; /* current extent record */
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unsigned int fabn; /* starting file allocation block number */
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int fork; /* current selected fork for I/O */
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unsigned long pos; /* current file seek pointer */
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int flags; /* bit flags */
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struct _hfsfile_ *prev;
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struct _hfsfile_ *next;
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};
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# define HFS_FILE_UPDATE_CATREC 0x01
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# define HFS_MAX_NRECS 35 /* maximum based on minimum record size */
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typedef struct _node_ {
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struct _btree_ *bt; /* btree to which this node belongs */
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unsigned long nnum; /* node index */
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NodeDescriptor nd; /* node descriptor */
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int rnum; /* current record index */
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UInteger roff[HFS_MAX_NRECS + 1];
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/* record offsets */
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block data; /* raw contents of node */
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} node;
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struct _hfsdir_ {
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struct _hfsvol_ *vol; /* associated volume */
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unsigned long dirid; /* directory ID of interest (or 0) */
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node n; /* current B*-tree node */
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struct _hfsvol_ *vptr; /* current volume pointer */
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struct _hfsdir_ *prev;
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struct _hfsdir_ *next;
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};
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typedef void (*keyunpackfunc)(const byte *, void *);
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typedef int (*keycomparefunc)(const void *, const void *);
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typedef struct _btree_ {
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hfsfile f; /* subset file information */
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node hdrnd; /* header node */
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BTHdrRec hdr; /* header record */
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byte *map; /* usage bitmap */
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unsigned long mapsz; /* number of bytes in bitmap */
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int flags; /* bit flags */
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keyunpackfunc keyunpack; /* key unpacking function */
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keycomparefunc keycompare; /* key comparison function */
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} btree;
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# define HFS_BT_UPDATE_HDR 0x01
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struct _hfsvol_ {
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void *priv; /* OS-dependent private descriptor data */
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long base; /* base of volume, for disk images with header */
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int flags; /* bit flags */
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int pnum; /* ordinal HFS partition number */
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unsigned long vstart; /* logical block offset to start of volume */
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unsigned long vlen; /* number of logical blocks in volume */
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unsigned int lpa; /* number of logical blocks per allocation block */
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bcache *cache; /* cache of recently used blocks */
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MDB mdb; /* master directory block */
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block *vbm; /* volume bitmap */
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unsigned short vbmsz; /* number of blocks in bitmap */
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btree ext; /* B*-tree control block for extents overflow file */
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btree cat; /* B*-tree control block for catalog file */
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unsigned long cwd; /* directory id of current working directory */
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int refs; /* number of external references to this volume */
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hfsfile *files; /* list of open files */
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hfsdir *dirs; /* list of open directories */
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struct _hfsvol_ *prev;
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struct _hfsvol_ *next;
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};
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# define HFS_VOL_OPEN 0x0001
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# define HFS_VOL_MOUNTED 0x0002
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# define HFS_VOL_READONLY 0x0004
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# define HFS_VOL_USINGCACHE 0x0008
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# define HFS_VOL_UPDATE_MDB 0x0010
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# define HFS_VOL_UPDATE_ALTMDB 0x0020
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# define HFS_VOL_UPDATE_VBM 0x0040
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# define HFS_VOL_OPT_MASK 0xff00
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extern hfsvol *hfs_mounts;
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