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., 51 Franklin Street - Fifth Floor, Boston,
18 * MA 02110-1301, USA.
19 *
20 * $Id: data.c,v 1.7 1998/11/02 22:08:57 rob Exp $
21 */
22
23 #include "config.h"
24 #include "data.h"
25
26 #define TIMEDIFF 2082844800UL
27
28 static
29 time_t tzdiff = -1;
30
31 static const
32 unsigned 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->getsb()
76 * DESCRIPTION: marshal 1 signed byte into local host format
77 */
d_getsb(register const unsigned char * ptr)78 signed char d_getsb(register const unsigned char *ptr)
79 {
80 return ptr[0];
81 }
82
83 /*
84 * NAME: data->getub()
85 * DESCRIPTION: marshal 1 unsigned byte into local host format
86 */
d_getub(register const unsigned char * ptr)87 unsigned char d_getub(register const unsigned char *ptr)
88 {
89 return ptr[0];
90 }
91
92 /*
93 * NAME: data->getsw()
94 * DESCRIPTION: marshal 2 signed bytes into local host format
95 */
d_getsw(register const unsigned char * ptr)96 signed short d_getsw(register const unsigned char *ptr)
97 {
98 return
99 ((( signed short) ptr[0] << 8) |
100 ((unsigned short) ptr[1] << 0));
101 }
102
103 /*
104 * NAME: data->getuw()
105 * DESCRIPTION: marshal 2 unsigned bytes into local host format
106 */
d_getuw(register const unsigned char * ptr)107 unsigned short d_getuw(register const unsigned char *ptr)
108 {
109 return
110 (((unsigned short) ptr[0] << 8) |
111 ((unsigned short) ptr[1] << 0));
112 }
113
114 /*
115 * NAME: data->getsl()
116 * DESCRIPTION: marshal 4 signed bytes into local host format
117 */
d_getsl(register const unsigned char * ptr)118 signed long d_getsl(register const unsigned char *ptr)
119 {
120 return
121 ((( signed long) ptr[0] << 24) |
122 ((unsigned long) ptr[1] << 16) |
123 ((unsigned long) ptr[2] << 8) |
124 ((unsigned long) ptr[3] << 0));
125 }
126
127 /*
128 * NAME: data->getul()
129 * DESCRIPTION: marshal 4 unsigned bytes into local host format
130 */
d_getul(register const unsigned char * ptr)131 unsigned long d_getul(register const unsigned char *ptr)
132 {
133 return
134 (((unsigned long) ptr[0] << 24) |
135 ((unsigned long) ptr[1] << 16) |
136 ((unsigned long) ptr[2] << 8) |
137 ((unsigned long) ptr[3] << 0));
138 }
139
140 /*
141 * NAME: data->putsb()
142 * DESCRIPTION: marshal 1 signed byte out in big-endian format
143 */
d_putsb(register unsigned char * ptr,register signed char data)144 void d_putsb(register unsigned char *ptr,
145 register signed char data)
146 {
147 *ptr = data;
148 }
149
150 /*
151 * NAME: data->putub()
152 * DESCRIPTION: marshal 1 unsigned byte out in big-endian format
153 */
d_putub(register unsigned char * ptr,register unsigned char data)154 void d_putub(register unsigned char *ptr,
155 register unsigned char data)
156 {
157 *ptr = data;
158 }
159
160 /*
161 * NAME: data->putsw()
162 * DESCRIPTION: marshal 2 signed bytes out in big-endian format
163 */
d_putsw(register unsigned char * ptr,register signed short data)164 void d_putsw(register unsigned char *ptr,
165 register signed short data)
166 {
167 *ptr++ = ((unsigned short) data & 0xff00) >> 8;
168 *ptr = ((unsigned short) data & 0x00ff) >> 0;
169 }
170
171 /*
172 * NAME: data->putuw()
173 * DESCRIPTION: marshal 2 unsigned bytes out in big-endian format
174 */
d_putuw(register unsigned char * ptr,register unsigned short data)175 void d_putuw(register unsigned char *ptr,
176 register unsigned short data)
177 {
178 *ptr++ = (data & 0xff00) >> 8;
179 *ptr = (data & 0x00ff) >> 0;
180 }
181
182 /*
183 * NAME: data->putsl()
184 * DESCRIPTION: marshal 4 signed bytes out in big-endian format
185 */
d_putsl(register unsigned char * ptr,register signed long data)186 void d_putsl(register unsigned char *ptr,
187 register signed long data)
188 {
189 *ptr++ = ((unsigned long) data & 0xff000000UL) >> 24;
190 *ptr++ = ((unsigned long) data & 0x00ff0000UL) >> 16;
191 *ptr++ = ((unsigned long) data & 0x0000ff00UL) >> 8;
192 *ptr = ((unsigned long) data & 0x000000ffUL) >> 0;
193 }
194
195 /*
196 * NAME: data->putul()
197 * DESCRIPTION: marshal 4 unsigned bytes out in big-endian format
198 */
d_putul(register unsigned char * ptr,register unsigned long data)199 void d_putul(register unsigned char *ptr,
200 register unsigned long data)
201 {
202 *ptr++ = (data & 0xff000000UL) >> 24;
203 *ptr++ = (data & 0x00ff0000UL) >> 16;
204 *ptr++ = (data & 0x0000ff00UL) >> 8;
205 *ptr = (data & 0x000000ffUL) >> 0;
206 }
207
208 /*
209 * NAME: data->fetchsb()
210 * DESCRIPTION: incrementally retrieve a signed byte of data
211 */
d_fetchsb(register const unsigned char ** ptr,register signed char * dest)212 void d_fetchsb(register const unsigned char **ptr,
213 register signed char *dest)
214 {
215 *dest = *(*ptr)++;
216 }
217
218 /*
219 * NAME: data->fetchub()
220 * DESCRIPTION: incrementally retrieve an unsigned byte of data
221 */
d_fetchub(register const unsigned char ** ptr,register unsigned char * dest)222 void d_fetchub(register const unsigned char **ptr,
223 register unsigned char *dest)
224 {
225 *dest = *(*ptr)++;
226 }
227
228 /*
229 * NAME: data->fetchsw()
230 * DESCRIPTION: incrementally retrieve a signed word of data
231 */
d_fetchsw(register const unsigned char ** ptr,register signed short * dest)232 void d_fetchsw(register const unsigned char **ptr,
233 register signed short *dest)
234 {
235 *dest =
236 ((( signed short) (*ptr)[0] << 8) |
237 ((unsigned short) (*ptr)[1] << 0));
238 *ptr += 2;
239 }
240
241 /*
242 * NAME: data->fetchuw()
243 * DESCRIPTION: incrementally retrieve an unsigned word of data
244 */
d_fetchuw(register const unsigned char ** ptr,register unsigned short * dest)245 void d_fetchuw(register const unsigned char **ptr,
246 register unsigned short *dest)
247 {
248 *dest =
249 (((unsigned short) (*ptr)[0] << 8) |
250 ((unsigned short) (*ptr)[1] << 0));
251 *ptr += 2;
252 }
253
254 /*
255 * NAME: data->fetchsl()
256 * DESCRIPTION: incrementally retrieve a signed long word of data
257 */
d_fetchsl(register const unsigned char ** ptr,register signed long * dest)258 void d_fetchsl(register const unsigned char **ptr,
259 register signed long *dest)
260 {
261 *dest =
262 ((( signed long) (*ptr)[0] << 24) |
263 ((unsigned long) (*ptr)[1] << 16) |
264 ((unsigned long) (*ptr)[2] << 8) |
265 ((unsigned long) (*ptr)[3] << 0));
266 *ptr += 4;
267 }
268
269 /*
270 * NAME: data->fetchul()
271 * DESCRIPTION: incrementally retrieve an unsigned long word of data
272 */
d_fetchul(register const unsigned char ** ptr,register unsigned long * dest)273 void d_fetchul(register const unsigned char **ptr,
274 register unsigned long *dest)
275 {
276 *dest =
277 (((unsigned long) (*ptr)[0] << 24) |
278 ((unsigned long) (*ptr)[1] << 16) |
279 ((unsigned long) (*ptr)[2] << 8) |
280 ((unsigned long) (*ptr)[3] << 0));
281 *ptr += 4;
282 }
283
284 /*
285 * NAME: data->storesb()
286 * DESCRIPTION: incrementally store a signed byte of data
287 */
d_storesb(register unsigned char ** ptr,register signed char data)288 void d_storesb(register unsigned char **ptr,
289 register signed char data)
290 {
291 *(*ptr)++ = data;
292 }
293
294 /*
295 * NAME: data->storeub()
296 * DESCRIPTION: incrementally store an unsigned byte of data
297 */
d_storeub(register unsigned char ** ptr,register unsigned char data)298 void d_storeub(register unsigned char **ptr,
299 register unsigned char data)
300 {
301 *(*ptr)++ = data;
302 }
303
304 /*
305 * NAME: data->storesw()
306 * DESCRIPTION: incrementally store a signed word of data
307 */
d_storesw(register unsigned char ** ptr,register signed short data)308 void d_storesw(register unsigned char **ptr,
309 register signed short data)
310 {
311 *(*ptr)++ = ((unsigned short) data & 0xff00) >> 8;
312 *(*ptr)++ = ((unsigned short) data & 0x00ff) >> 0;
313 }
314
315 /*
316 * NAME: data->storeuw()
317 * DESCRIPTION: incrementally store an unsigned word of data
318 */
d_storeuw(register unsigned char ** ptr,register unsigned short data)319 void d_storeuw(register unsigned char **ptr,
320 register unsigned short data)
321 {
322 *(*ptr)++ = (data & 0xff00) >> 8;
323 *(*ptr)++ = (data & 0x00ff) >> 0;
324 }
325
326 /*
327 * NAME: data->storesl()
328 * DESCRIPTION: incrementally store a signed long word of data
329 */
d_storesl(register unsigned char ** ptr,register signed long data)330 void d_storesl(register unsigned char **ptr,
331 register signed long data)
332 {
333 *(*ptr)++ = ((unsigned long) data & 0xff000000UL) >> 24;
334 *(*ptr)++ = ((unsigned long) data & 0x00ff0000UL) >> 16;
335 *(*ptr)++ = ((unsigned long) data & 0x0000ff00UL) >> 8;
336 *(*ptr)++ = ((unsigned long) data & 0x000000ffUL) >> 0;
337 }
338
339 /*
340 * NAME: data->storeul()
341 * DESCRIPTION: incrementally store an unsigned long word of data
342 */
d_storeul(register unsigned char ** ptr,register unsigned long data)343 void d_storeul(register unsigned char **ptr,
344 register unsigned long data)
345 {
346 *(*ptr)++ = (data & 0xff000000UL) >> 24;
347 *(*ptr)++ = (data & 0x00ff0000UL) >> 16;
348 *(*ptr)++ = (data & 0x0000ff00UL) >> 8;
349 *(*ptr)++ = (data & 0x000000ffUL) >> 0;
350 }
351
352 /*
353 * NAME: data->fetchstr()
354 * DESCRIPTION: incrementally retrieve a string
355 */
d_fetchstr(const unsigned char ** ptr,char * dest,unsigned size)356 void d_fetchstr(const unsigned char **ptr, char *dest, unsigned size)
357 {
358 unsigned len;
359
360 len = d_getub(*ptr);
361
362 if (len > 0 && len < size)
363 memcpy(dest, *ptr + 1, len);
364 else
365 len = 0;
366
367 dest[len] = 0;
368
369 *ptr += size;
370 }
371
372 /*
373 * NAME: data->storestr()
374 * DESCRIPTION: incrementally store a string
375 */
d_storestr(unsigned char ** ptr,const char * src,unsigned size)376 void d_storestr(unsigned char **ptr, const char *src, unsigned size)
377 {
378 unsigned len;
379
380 len = strlen(src);
381 if (len > --size)
382 len = 0;
383
384 d_storeub(ptr, len);
385
386 memcpy(*ptr, src, len);
387 memset(*ptr + len, 0, size - len);
388
389 *ptr += size;
390 }
391
392 /*
393 * NAME: data->relstring()
394 * DESCRIPTION: compare two strings as per MacOS for HFS
395 */
d_relstring(const char * str1,const char * str2)396 int d_relstring(const char *str1, const char *str2)
397 {
398 register int diff;
399
400 while (*str1 && *str2)
401 {
402 diff = hfs_charorder[(unsigned char) *str1] -
403 hfs_charorder[(unsigned char) *str2];
404
405 if (diff)
406 return diff;
407
408 ++str1, ++str2;
409 }
410
411 if (! *str1 && *str2)
412 return -1;
413 else if (*str1 && ! *str2)
414 return 1;
415
416 return 0;
417 }
418
419 /*
420 * NAME: calctzdiff()
421 * DESCRIPTION: calculate the timezone difference between local time and UTC
422 */
423 static
calctzdiff(void)424 void calctzdiff(void)
425 {
426 # ifdef HAVE_MKTIME
427
428 time_t t;
429 int isdst;
430 struct tm tm;
431 const struct tm *tmp;
432
433 time(&t);
434 isdst = localtime(&t)->tm_isdst;
435
436 tmp = gmtime(&t);
437 if (tmp)
438 {
439 tm = *tmp;
440 tm.tm_isdst = isdst;
441
442 tzdiff = t - mktime(&tm);
443 }
444 else
445 tzdiff = 0;
446
447 # else
448
449 tzdiff = 0;
450
451 # endif
452 }
453
454 /*
455 * NAME: data->ltime()
456 * DESCRIPTION: convert MacOS time to local time
457 */
d_ltime(unsigned long mtime)458 time_t d_ltime(unsigned long mtime)
459 {
460 if (tzdiff == -1)
461 calctzdiff();
462
463 return (time_t) (mtime - TIMEDIFF) - tzdiff;
464 }
465
466 /*
467 * NAME: data->mtime()
468 * DESCRIPTION: convert local time to MacOS time
469 */
d_mtime(time_t ltime)470 unsigned long d_mtime(time_t ltime)
471 {
472 if (tzdiff == -1)
473 calctzdiff();
474
475 return (unsigned long) (ltime + tzdiff) + TIMEDIFF;
476 }
477