1 /* @(#)data.c 1.9 13/04/30 joerg */
2 #include <schily/mconfig.h>
3 #ifndef lint
4 static UConst char sccsid[] =
5 "@(#)data.c 1.9 13/04/30 joerg";
6 #endif
7 /*
8 * hfsutils - tools for reading and writing Macintosh HFS volumes
9 * Copyright (C) 1996, 1997 Robert Leslie
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 #include <schily/string.h>
27 #include <schily/time.h>
28
29 #include "internal.h"
30 #include "data.h"
31 #include "btree.h"
32
33 #ifdef APPLE_HYB
34 /*
35 * Depending on the version, AppleDouble/Single stores dates
36 * relative to 1st Jan 1904 (v1) or 1st Jan 2000 (v2)
37 *
38 * DUTDIFF is the difference between 1st Jan 2000 and
39 * 1st Jan 1970 (Unix epoch)).
40 */
41
42 #define DUTDIFF 946684800L
43 #endif /* APPLE_HYB */
44 #define MUTDIFF 2082844800L
45 #define TZNONE 0x0FFFFFFFL /* A timezone diff that cannot occur */
46
47 static void calctzdiff __PR((void));
48
49 static
50 unsigned long tzdiff = TZNONE;
51
52 static
53 unsigned char hfs_charorder[256] = {
54 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
55 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
56 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
57 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
58
59 0x20, 0x22, 0x23, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
60 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
61 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
62 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
63
64 0x47, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
65 0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
66 0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
67 0xa3, 0xa5, 0xa8, 0xaa, 0xab, 0xac, 0xad, 0xae,
68
69 0x54, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
70 0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
71 0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
72 0xa3, 0xa5, 0xa8, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
73
74 0x4c, 0x50, 0x5c, 0x62, 0x7d, 0x81, 0x9a, 0x55,
75 0x4a, 0x56, 0x4c, 0x4e, 0x50, 0x5c, 0x62, 0x64,
76 0x65, 0x66, 0x6f, 0x70, 0x71, 0x72, 0x7d, 0x89,
77 0x8a, 0x8b, 0x81, 0x83, 0x9c, 0x9d, 0x9e, 0x9a,
78
79 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0x95,
80 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0x52, 0x85,
81 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
82 0xc9, 0xca, 0xcb, 0x57, 0x8c, 0xcc, 0x52, 0x85,
83
84 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0x26,
85 0x27, 0xd4, 0x20, 0x4a, 0x4e, 0x83, 0x87, 0x87,
86 0xd5, 0xd6, 0x24, 0x25, 0x2d, 0x2e, 0xd7, 0xd8,
87 0xa7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
88
89 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
90 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
91 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
92 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
93 };
94
95 /*
96 * NAME: data->getb()
97 * DESCRIPTION: marshal 1 byte into local host format
98 */
d_getb(ptr)99 char d_getb(ptr)
100 unsigned char *ptr;
101 {
102 return (char) ptr[0];
103 }
104
105 /*
106 * NAME: data->getw()
107 * DESCRIPTION: marshal 2 bytes into local host format
108 */
d_getw(ptr)109 short d_getw(ptr)
110 unsigned char *ptr;
111 {
112 return (short)
113 ((ptr[0] << 8) |
114 (ptr[1] << 0));
115 }
116
117 /*
118 * NAME: data->getl()
119 * DESCRIPTION: marshal 4 bytes into local host format
120 */
d_getl(ptr)121 long d_getl(ptr)
122 unsigned char *ptr;
123 {
124 return (long)
125 ((ptr[0] << 24) |
126 (ptr[1] << 16) |
127 (ptr[2] << 8) |
128 (ptr[3] << 0));
129 }
130
131 /*
132 * NAME: data->putb()
133 * DESCRIPTION: marshal 1 byte out to Macintosh (big-endian) format
134 */
135 #ifdef PROTOTYPES
d_putb(unsigned char * ptr,char data)136 void d_putb(unsigned char *ptr, char data)
137 #else
138 void d_putb(ptr, data)
139 unsigned char *ptr;
140 char data;
141 #endif
142 {
143 ptr[0] = (unsigned char) data;
144 }
145
146 /*
147 * NAME: data->putw()
148 * DESCRIPTION: marshal 2 bytes out to Macintosh (big-endian) format
149 */
150 #ifdef PROTOTYPES
d_putw(unsigned char * ptr,short data)151 void d_putw(unsigned char *ptr, short data)
152 #else
153 void d_putw(ptr, data)
154 unsigned char *ptr;
155 short data;
156 #endif
157 {
158 ptr[0] = ((unsigned) data & 0xff00) >> 8;
159 ptr[1] = ((unsigned) data & 0x00ff) >> 0;
160 }
161
162 /*
163 * NAME: data->putl()
164 * DESCRIPTION: marshal 4 bytes out to Macintosh (big-endian) format
165 */
d_putl(ptr,data)166 void d_putl(ptr, data)
167 unsigned char *ptr;
168 long data;
169 {
170 ptr[0] = ((unsigned long) data & 0xff000000) >> 24;
171 ptr[1] = ((unsigned long) data & 0x00ff0000) >> 16;
172 ptr[2] = ((unsigned long) data & 0x0000ff00) >> 8;
173 ptr[3] = ((unsigned long) data & 0x000000ff) >> 0;
174 }
175
176 /*
177 * NAME: data->fetchb()
178 * DESCRIPTION: incrementally retrieve a byte of data
179 */
d_fetchb(ptr,dest)180 void d_fetchb(ptr, dest)
181 unsigned char **ptr;
182 char *dest;
183 {
184 *dest = d_getb(*ptr);
185 *ptr += 1;
186 }
187
188 /*
189 * NAME: data->fetchw()
190 * DESCRIPTION: incrementally retrieve a word of data
191 */
d_fetchw(ptr,dest)192 void d_fetchw(ptr, dest)
193 unsigned char **ptr;
194 short *dest;
195 {
196 *dest = d_getw(*ptr);
197 *ptr += 2;
198 }
199
200 /*
201 * NAME: data->fetchl()
202 * DESCRIPTION: incrementally retrieve a long word of data
203 */
d_fetchl(ptr,dest)204 void d_fetchl(ptr, dest)
205 unsigned char **ptr;
206 long *dest;
207 {
208 *dest = d_getl(*ptr);
209 *ptr += 4;
210 }
211
212 /*
213 * NAME: data->fetchs()
214 * DESCRIPTION: incrementally retrieve a string
215 */
d_fetchs(ptr,dest,size)216 void d_fetchs(ptr, dest, size)
217 unsigned char **ptr;
218 char *dest;
219 int size;
220 {
221 int len;
222 char blen;
223
224 d_fetchb(ptr, &blen);
225 len = blen;
226
227 if (len > 0 && len < size)
228 memcpy(dest, *ptr, len);
229 else
230 len = 0;
231
232 dest[len] = 0;
233
234 *ptr += size - 1;
235 }
236
237 /*
238 * NAME: data->storeb()
239 * DESCRIPTION: incrementally store a byte of data
240 */
241 #ifdef PROTOTYPES
d_storeb(unsigned char ** ptr,char data)242 void d_storeb(unsigned char **ptr, char data)
243 #else
244 void d_storeb(ptr, data)
245 unsigned char **ptr;
246 char data;
247 #endif
248 {
249 d_putb(*ptr, data);
250 *ptr += 1;
251 }
252
253 /*
254 * NAME: data->storew()
255 * DESCRIPTION: incrementally store a word of data
256 */
257 #ifdef PROTOTYPES
d_storew(unsigned char ** ptr,short data)258 void d_storew(unsigned char **ptr, short data)
259 #else
260 void d_storew(ptr, data)
261 unsigned char **ptr;
262 short data;
263 #endif
264 {
265 d_putw(*ptr, data);
266 *ptr += 2;
267 }
268
269 /*
270 * NAME: data->storel()
271 * DESCRIPTION: incrementally store a long word of data
272 */
d_storel(ptr,data)273 void d_storel(ptr, data)
274 unsigned char **ptr;
275 long data;
276 {
277 d_putl(*ptr, data);
278 *ptr += 4;
279 }
280
281 /*
282 * NAME: data->stores()
283 * DESCRIPTION: incrementally store a string
284 */
d_stores(ptr,src,size)285 void d_stores(ptr, src, size)
286 unsigned char **ptr;
287 char *src;
288 int size;
289 {
290 int len;
291
292 len = strlen(src);
293 if (len > --size)
294 len = 0;
295
296 d_storeb(ptr, (unsigned char) len);
297
298 memcpy(*ptr, src, len);
299 memset(*ptr + len, 0, size - len);
300
301 *ptr += size;
302 }
303
304 /*
305 * NAME: calctzdiff()
306 * DESCRIPTION: calculate the timezone difference between local time and UTC
307 */
308 static
calctzdiff()309 void calctzdiff()
310 {
311 time_t t;
312 int isdst;
313 struct tm tm, *tmp;
314
315 time(&t);
316 isdst = localtime(&t)->tm_isdst;
317
318 tmp = gmtime(&t);
319 if (tmp)
320 {
321 tm = *tmp;
322 tm.tm_isdst = isdst;
323
324 tzdiff = t - mktime(&tm);
325 }
326 else
327 tzdiff = 0;
328 }
329
330 /*
331 * NAME: data->tomtime()
332 * DESCRIPTION: convert UNIX time to Macintosh time
333 */
d_tomtime(secs)334 unsigned long d_tomtime(secs)
335 unsigned long secs;
336 {
337 time_t uxtime = secs;
338
339 if (tzdiff == TZNONE)
340 calctzdiff();
341
342 return uxtime + tzdiff + MUTDIFF;
343 }
344
345 /*
346 * NAME: data->toutime()
347 * DESCRIPTION: convert Macintosh time to UNIX time
348 */
d_toutime(secs)349 unsigned long d_toutime(secs)
350 unsigned long secs;
351 {
352 time_t uxtime = secs;
353
354 if (tzdiff == TZNONE)
355 calctzdiff();
356
357 return uxtime - MUTDIFF - tzdiff;
358 }
359
360 #ifdef APPLE_HYB
361 /*
362 * NAME: data->dtoutime()
363 * DESCRIPTION: convert Apple Double v2 time to UNIX time
364 */
d_dtoutime(secs)365 unsigned long d_dtoutime(secs)
366 long secs;
367 {
368 time_t uxtime = secs;
369
370 if (tzdiff == TZNONE)
371 calctzdiff();
372
373 return uxtime + DUTDIFF - tzdiff;
374 }
375 #endif /* APPLE_HYB */
376
377 /*
378 * NAME: data->relstring()
379 * DESCRIPTION: compare two strings as per MacOS for HFS
380 */
d_relstring(str1,str2)381 int d_relstring(str1, str2)
382 char *str1;
383 char *str2;
384 {
385 int diff;
386
387 while (*str1 && *str2)
388 {
389 diff = hfs_charorder[(unsigned char) *str1] -
390 hfs_charorder[(unsigned char) *str2];
391
392 if (diff)
393 return diff;
394
395 ++str1, ++str2;
396 }
397
398 if (! *str1 && *str2)
399 return -1;
400 else if (*str1 && ! *str2)
401 return 1;
402
403 return 0;
404 }
405