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1.1 root 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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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: */
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
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: */
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: */
470: unsigned long d_mtime(time_t ltime)
471: {
472: if (tzdiff == -1)
473: calctzdiff();
474:
475: return (unsigned long) (ltime + tzdiff) + TIMEDIFF;
476: }
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