1/*
2 * hfsutils - tools for reading and writing Macintosh HFS volumes
3 * Copyright (C) 1996, 1997 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# include <string.h>
21# include <time.h>
22
23# include "internal.h"
24# include "data.h"
25# include "btree.h"
26
27# define MUTDIFF  2082844800L
28
29static
30unsigned long tzdiff = -1;
31
32unsigned char hfs_charorder[256] = {
33  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
34  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
35  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
36  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
37
38  0x20, 0x22, 0x23, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
39  0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
40  0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
41  0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
42
43  0x47, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
44  0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
45  0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
46  0xa3, 0xa5, 0xa8, 0xaa, 0xab, 0xac, 0xad, 0xae,
47
48  0x54, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
49  0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
50  0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
51  0xa3, 0xa5, 0xa8, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
52
53  0x4c, 0x50, 0x5c, 0x62, 0x7d, 0x81, 0x9a, 0x55,
54  0x4a, 0x56, 0x4c, 0x4e, 0x50, 0x5c, 0x62, 0x64,
55  0x65, 0x66, 0x6f, 0x70, 0x71, 0x72, 0x7d, 0x89,
56  0x8a, 0x8b, 0x81, 0x83, 0x9c, 0x9d, 0x9e, 0x9a,
57
58  0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0x95,
59  0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0x52, 0x85,
60  0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
61  0xc9, 0xca, 0xcb, 0x57, 0x8c, 0xcc, 0x52, 0x85,
62
63  0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0x26,
64  0x27, 0xd4, 0x20, 0x4a, 0x4e, 0x83, 0x87, 0x87,
65  0xd5, 0xd6, 0x24, 0x25, 0x2d, 0x2e, 0xd7, 0xd8,
66  0xa7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
67
68  0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
69  0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
70  0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
71  0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
72};
73
74/*
75 * NAME:	data->getb()
76 * DESCRIPTION:	marshal 1 byte into local host format
77 */
78char d_getb(unsigned char *ptr)
79{
80  return (char) ptr[0];
81}
82
83/*
84 * NAME:	data->getw()
85 * DESCRIPTION:	marshal 2 bytes into local host format
86 */
87short d_getw(unsigned char *ptr)
88{
89  return (short)
90    ((ptr[0] << 8) |
91     (ptr[1] << 0));
92}
93
94/*
95 * NAME:	data->getl()
96 * DESCRIPTION:	marshal 4 bytes into local host format
97 */
98long d_getl(unsigned char *ptr)
99{
100  return (long)
101    ((ptr[0] << 24) |
102     (ptr[1] << 16) |
103     (ptr[2] <<  8) |
104     (ptr[3] <<  0));
105}
106
107/*
108 * NAME:	data->putb()
109 * DESCRIPTION:	marshal 1 byte out to Macintosh (big-endian) format
110 */
111void d_putb(unsigned char *ptr, char data)
112{
113  ptr[0] = (unsigned char) data;
114}
115
116/*
117 * NAME:	data->putw()
118 * DESCRIPTION:	marshal 2 bytes out to Macintosh (big-endian) format
119 */
120void d_putw(unsigned char *ptr, short data)
121{
122  ptr[0] = ((unsigned short) data & 0xff00) >> 8;
123  ptr[1] = ((unsigned short) data & 0x00ff) >> 0;
124}
125
126/*
127 * NAME:	data->putl()
128 * DESCRIPTION:	marshal 4 bytes out to Macintosh (big-endian) format
129 */
130void d_putl(unsigned char *ptr, long data)
131{
132  ptr[0] = ((unsigned long) data & 0xff000000) >> 24;
133  ptr[1] = ((unsigned long) data & 0x00ff0000) >> 16;
134  ptr[2] = ((unsigned long) data & 0x0000ff00) >>  8;
135  ptr[3] = ((unsigned long) data & 0x000000ff) >>  0;
136}
137
138/*
139 * NAME:	data->fetchb()
140 * DESCRIPTION:	incrementally retrieve a byte of data
141 */
142void d_fetchb(unsigned char **ptr, char *dest)
143{
144  *dest = d_getb(*ptr);
145  *ptr += 1;
146}
147
148/*
149 * NAME:	data->fetchw()
150 * DESCRIPTION:	incrementally retrieve a word of data
151 */
152void d_fetchw(unsigned char **ptr, short *dest)
153{
154  *dest = d_getw(*ptr);
155  *ptr += 2;
156}
157
158/*
159 * NAME:	data->fetchl()
160 * DESCRIPTION:	incrementally retrieve a long word of data
161 */
162void d_fetchl(unsigned char **ptr, long *dest)
163{
164  *dest = d_getl(*ptr);
165  *ptr += 4;
166}
167
168/*
169 * NAME:	data->fetchs()
170 * DESCRIPTION:	incrementally retrieve a string
171 */
172void d_fetchs(unsigned char **ptr, char *dest, int size)
173{
174  int len;
175  char blen;
176
177  d_fetchb(ptr, &blen);
178  len = blen;
179
180  if (len > 0 && len < size)
181    memcpy(dest, *ptr, len);
182  else
183    len = 0;
184
185  dest[len] = 0;
186
187  *ptr += size - 1;
188}
189
190/*
191 * NAME:	data->storeb()
192 * DESCRIPTION:	incrementally store a byte of data
193 */
194void d_storeb(unsigned char **ptr, char data)
195{
196  d_putb(*ptr, data);
197  *ptr += 1;
198}
199
200/*
201 * NAME:	data->storew()
202 * DESCRIPTION:	incrementally store a word of data
203 */
204void d_storew(unsigned char **ptr, short data)
205{
206  d_putw(*ptr, data);
207  *ptr += 2;
208}
209
210/*
211 * NAME:	data->storel()
212 * DESCRIPTION:	incrementally store a long word of data
213 */
214void d_storel(unsigned char **ptr, long data)
215{
216  d_putl(*ptr, data);
217  *ptr += 4;
218}
219
220/*
221 * NAME:	data->stores()
222 * DESCRIPTION:	incrementally store a string
223 */
224void d_stores(unsigned char **ptr, char *src, int size)
225{
226  int len;
227
228  len = strlen(src);
229  if (len > --size)
230    len = 0;
231
232  d_storeb(ptr, (unsigned char) len);
233
234  memcpy(*ptr, src, len);
235  memset(*ptr + len, 0, size - len);
236
237  *ptr += size;
238}
239
240/*
241 * NAME:	calctzdiff()
242 * DESCRIPTION:	calculate the timezone difference between local time and UTC
243 */
244static
245void calctzdiff(void)
246{
247  time_t t;
248  int isdst;
249  struct tm tm, *tmp;
250
251  time(&t);
252  isdst = localtime(&t)->tm_isdst;
253
254  tmp = gmtime(&t);
255  if (tmp)
256    {
257      tm = *tmp;
258      tm.tm_isdst = isdst;
259
260      tzdiff = t - mktime(&tm);
261    }
262  else
263    tzdiff = 0;
264}
265
266/*
267 * NAME:	data->tomtime()
268 * DESCRIPTION:	convert UNIX time to Macintosh time
269 */
270unsigned long d_tomtime(unsigned long secs)
271{
272  time_t utime = secs;
273
274  if (tzdiff == -1)
275    calctzdiff();
276
277  return utime + tzdiff + MUTDIFF;
278}
279
280/*
281 * NAME:	data->toutime()
282 * DESCRIPTION:	convert Macintosh time to UNIX time
283 */
284unsigned long d_toutime(unsigned long secs)
285{
286  time_t utime = secs;
287
288  if (tzdiff == -1)
289    calctzdiff();
290
291  return utime - MUTDIFF - tzdiff;
292}
293
294/*
295 * NAME:	data->relstring()
296 * DESCRIPTION:	compare two strings as per MacOS for HFS
297 */
298int d_relstring(char *str1, char *str2)
299{
300  int diff;
301
302  while (*str1 && *str2)
303    {
304      diff = hfs_charorder[(unsigned char) *str1] -
305	     hfs_charorder[(unsigned char) *str2];
306
307      if (diff)
308	return diff;
309
310      ++str1, ++str2;
311    }
312
313  if (! *str1 && *str2)
314    return -1;
315  else if (*str1 && ! *str2)
316    return 1;
317
318  return 0;
319}
320