/[pearpc]/src/io/prom/fs/hfs/libhfs.h
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Contents of /src/io/prom/fs/hfs/libhfs.h

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Revision 1 - (show annotations)
Wed Sep 5 17:11:21 2007 UTC (16 years, 6 months ago) by dpavlin
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1 /*
2 * libhfs - library for reading and writing Macintosh HFS volumes
3 * Copyright (C) 1996-1998 Robert Leslie
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 *
19 */
20
21 # include "hfs.h"
22 # include "apple.h"
23
24 extern int errno;
25
26 # define ERROR(code, str) \
27 do { hfs_error = (str), errno = (code); goto fail; } while (0)
28
29 #include "tools/debug.h"
30 #if 0
31 # ifdef DEBUG
32 # define ASSERT(cond) do { if (! (cond)) abort(); } while (0)
33 # else
34 # define ASSERT(cond) /* nothing */
35 # endif
36 # endif
37
38
39 # define SIZE(type, n) ((size_t) (sizeof(type) * (n)))
40 # define ALLOC(type, n) ((type *) malloc(SIZE(type, n)))
41 # define ALLOCX(type, n) ((n) ? ALLOC(type, n) : (type *) 0)
42 # define FREE(ptr) ((ptr) ? (void) free((void *) ptr) : (void) 0)
43
44 # define REALLOC(ptr, type, n) \
45 ((type *) ((ptr) ? realloc(ptr, SIZE(type, n)) : malloc(SIZE(type, n))))
46 # define REALLOCX(ptr, type, n) \
47 ((n) ? REALLOC(ptr, type, n) : (FREE(ptr), (type *) 0))
48
49 # define BMTST(bm, num) \
50 (((const byte *) (bm))[(num) >> 3] & (0x80 >> ((num) & 0x07)))
51 # define BMSET(bm, num) \
52 (((byte *) (bm))[(num) >> 3] |= (0x80 >> ((num) & 0x07)))
53 # define BMCLR(bm, num) \
54 (((byte *) (bm))[(num) >> 3] &= ~(0x80 >> ((num) & 0x07)))
55
56 # define STRINGIZE(x) #x
57 # define STR(x) STRINGIZE(x)
58
59 typedef byte block[HFS_BLOCKSZ];
60
61 typedef struct _bucket_ {
62 int flags; /* bit flags */
63 unsigned int count; /* number of times this block is requested */
64
65 unsigned long bnum; /* logical block number */
66 block *data; /* pointer to block contents */
67
68 struct _bucket_ *cnext; /* next bucket in cache chain */
69 struct _bucket_ *cprev; /* previous bucket in cache chain */
70
71 struct _bucket_ *hnext; /* next bucket in hash chain */
72 struct _bucket_ **hprev; /* previous bucket's pointer to this bucket */
73 } bucket;
74
75 # define HFS_BUCKET_INUSE 0x01
76 # define HFS_BUCKET_DIRTY 0x02
77
78 # define HFS_CACHESZ 128
79 # define HFS_HASHSZ 32
80 # define HFS_BLOCKBUFSZ 16
81
82 typedef struct {
83 struct _hfsvol_ *vol; /* volume to which cache belongs */
84 bucket *tail; /* end of bucket chain */
85
86 unsigned int hits; /* number of cache hits */
87 unsigned int misses; /* number of cache misses */
88
89 bucket chain[HFS_CACHESZ]; /* cache bucket chain */
90 bucket *hash[HFS_HASHSZ]; /* hash table for bucket chain */
91
92 block pool[HFS_CACHESZ]; /* physical blocks in cache */
93 } bcache;
94
95 # define HFS_MAP1SZ 256
96 # define HFS_MAPXSZ 492
97
98 # define HFS_NODEREC(nd, rnum) ((nd).data + (nd).roff[rnum])
99 # define HFS_RECLEN(nd, rnum) ((nd).roff[(rnum) + 1] - (nd).roff[rnum])
100
101 # define HFS_RECKEYLEN(ptr) (*(const byte *) (ptr))
102 # define HFS_RECKEYSKIP(ptr) ((size_t) ((1 + HFS_RECKEYLEN(ptr) + 1) & ~1))
103 # define HFS_RECDATA(ptr) ((ptr) + HFS_RECKEYSKIP(ptr))
104
105 # define HFS_SETKEYLEN(ptr, x) (*(byte *) (ptr) = (x))
106
107 # define HFS_CATDATALEN sizeof(CatDataRec)
108 # define HFS_EXTDATALEN sizeof(ExtDataRec)
109 # define HFS_MAX_DATALEN (HFS_CATDATALEN > HFS_EXTDATALEN ? \
110 HFS_CATDATALEN : HFS_EXTDATALEN)
111
112 # define HFS_CATKEYLEN sizeof(CatKeyRec)
113 # define HFS_EXTKEYLEN sizeof(ExtKeyRec)
114 # define HFS_MAX_KEYLEN (HFS_CATKEYLEN > HFS_EXTKEYLEN ? \
115 HFS_CATKEYLEN : HFS_EXTKEYLEN)
116
117 # define HFS_MAX_CATRECLEN (HFS_CATKEYLEN + HFS_CATDATALEN)
118 # define HFS_MAX_EXTRECLEN (HFS_EXTKEYLEN + HFS_EXTDATALEN)
119 # define HFS_MAX_RECLEN (HFS_MAX_KEYLEN + HFS_MAX_DATALEN)
120
121 # define HFS_SIGWORD 0x4244
122 # define HFS_SIGWORD_MFS ((APPLEInteger) 0xd2d7)
123
124 # define HFS_ATRB_BUSY (1 << 6)
125 # define HFS_ATRB_HLOCKED (1 << 7)
126 # define HFS_ATRB_UMOUNTED (1 << 8)
127 # define HFS_ATRB_BBSPARED (1 << 9)
128 # define HFS_ATRB_BVINCONSIS (1 << 11)
129 # define HFS_ATRB_COPYPROT (1 << 14)
130 # define HFS_ATRB_SLOCKED (1 << 15)
131
132 struct _hfsfile_ {
133 struct _hfsvol_ *vol; /* pointer to volume descriptor */
134 unsigned long parid; /* parent directory ID of this file */
135 char name[HFS_MAX_FLEN + 1]; /* catalog name of this file */
136 CatDataRec cat; /* catalog information */
137 ExtDataRec ext; /* current extent record */
138 unsigned int fabn; /* starting file allocation block number */
139 int fork; /* current selected fork for I/O */
140 unsigned long pos; /* current file seek pointer */
141 int flags; /* bit flags */
142
143 struct _hfsfile_ *prev;
144 struct _hfsfile_ *next;
145 };
146
147 # define HFS_FILE_UPDATE_CATREC 0x01
148
149 # define HFS_MAX_NRECS 35 /* maximum based on minimum record size */
150
151 typedef struct _node_ {
152 struct _btree_ *bt; /* btree to which this node belongs */
153 unsigned long nnum; /* node index */
154 NodeDescriptor nd; /* node descriptor */
155 int rnum; /* current record index */
156 UInteger roff[HFS_MAX_NRECS + 1];
157 /* record offsets */
158 block data; /* raw contents of node */
159 } node;
160
161 struct _hfsdir_ {
162 struct _hfsvol_ *vol; /* associated volume */
163 unsigned long dirid; /* directory ID of interest (or 0) */
164
165 node n; /* current B*-tree node */
166 struct _hfsvol_ *vptr; /* current volume pointer */
167
168 struct _hfsdir_ *prev;
169 struct _hfsdir_ *next;
170 };
171
172 typedef void (*keyunpackfunc)(const byte *, void *);
173 typedef int (*keycomparefunc)(const void *, const void *);
174
175 typedef struct _btree_ {
176 hfsfile f; /* subset file information */
177 node hdrnd; /* header node */
178 BTHdrRec hdr; /* header record */
179 byte *map; /* usage bitmap */
180 unsigned long mapsz; /* number of bytes in bitmap */
181 int flags; /* bit flags */
182
183 keyunpackfunc keyunpack; /* key unpacking function */
184 keycomparefunc keycompare; /* key comparison function */
185 } btree;
186
187 # define HFS_BT_UPDATE_HDR 0x01
188
189 struct _hfsvol_ {
190 void *priv; /* OS-dependent private descriptor data */
191 int flags; /* bit flags */
192
193 int pnum; /* ordinal HFS partition number */
194 unsigned long vstart; /* logical block offset to start of volume */
195 unsigned long vlen; /* number of logical blocks in volume */
196 unsigned int lpa; /* number of logical blocks per allocation block */
197
198 bcache *cache; /* cache of recently used blocks */
199
200 MDB mdb; /* master directory block */
201 block *vbm; /* volume bitmap */
202 unsigned short vbmsz; /* number of blocks in bitmap */
203
204 btree ext; /* B*-tree control block for extents overflow file */
205 btree cat; /* B*-tree control block for catalog file */
206
207 unsigned long cwd; /* directory id of current working directory */
208
209 int refs; /* number of external references to this volume */
210 hfsfile *files; /* list of open files */
211 hfsdir *dirs; /* list of open directories */
212
213 struct _hfsvol_ *prev;
214 struct _hfsvol_ *next;
215 };
216
217 # define HFS_VOL_OPEN 0x0001
218 # define HFS_VOL_MOUNTED 0x0002
219 # define HFS_VOL_READONLY 0x0004
220 # define HFS_VOL_USINGCACHE 0x0008
221
222 # define HFS_VOL_UPDATE_MDB 0x0010
223 # define HFS_VOL_UPDATE_ALTMDB 0x0020
224 # define HFS_VOL_UPDATE_VBM 0x0040
225
226 # define HFS_VOL_OPT_MASK 0xff00
227
228 extern hfsvol *hfs_mounts;

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