fs/hfs/data.c

/*
 * libhfs - library for reading and writing Macintosh HFS volumes
 * Copyright (C) 1996-1998 Robert Leslie
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

# ifdef HAVE_CONFIG_H
#  include "config.h"
# endif

# include <string.h>
# include <time.h>

# ifdef TM_IN_SYS_TIME
#  include <sys/time.h>
# endif

# include "data.h"

# define TIMEDIFF  2082844800UL

static
time_t tzdiff = -1;

const
unsigned char hfs_charorder[256] = {
  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,

  0x20, 0x22, 0x23, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
  0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
  0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
  0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,

  0x47, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
  0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
  0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
  0xa3, 0xa5, 0xa8, 0xaa, 0xab, 0xac, 0xad, 0xae,

  0x54, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
  0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
  0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
  0xa3, 0xa5, 0xa8, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,

  0x4c, 0x50, 0x5c, 0x62, 0x7d, 0x81, 0x9a, 0x55,
  0x4a, 0x56, 0x4c, 0x4e, 0x50, 0x5c, 0x62, 0x64,
  0x65, 0x66, 0x6f, 0x70, 0x71, 0x72, 0x7d, 0x89,
  0x8a, 0x8b, 0x81, 0x83, 0x9c, 0x9d, 0x9e, 0x9a,

  0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0x95,
  0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0x52, 0x85,
  0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
  0xc9, 0xca, 0xcb, 0x57, 0x8c, 0xcc, 0x52, 0x85,

  0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0x26,
  0x27, 0xd4, 0x20, 0x4a, 0x4e, 0x83, 0x87, 0x87,
  0xd5, 0xd6, 0x24, 0x25, 0x2d, 0x2e, 0xd7, 0xd8,
  0xa7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,

  0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
  0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
  0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
  0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
};

/*
 * NAME:        data->getsb()
 * DESCRIPTION: marshal 1 signed byte into local host format
 */
signed char d_getsb(register const unsigned char *ptr)
{
  return ptr[0];
}

/*
 * NAME:        data->getub()
 * DESCRIPTION: marshal 1 unsigned byte into local host format
 */
unsigned char d_getub(register const unsigned char *ptr)
{
  return ptr[0];
}

/*
 * NAME:        data->getsw()
 * DESCRIPTION: marshal 2 signed bytes into local host format
 */
signed short d_getsw(register const unsigned char *ptr)
{
  return
    (((  signed short) ptr[0] << 8) |
     ((unsigned short) ptr[1] << 0));
}

/*
 * NAME:        data->getuw()
 * DESCRIPTION: marshal 2 unsigned bytes into local host format
 */
unsigned short d_getuw(register const unsigned char *ptr)
{
  return
    (((unsigned short) ptr[0] << 8) |
     ((unsigned short) ptr[1] << 0));
}

/*
 * NAME:        data->getsl()
 * DESCRIPTION: marshal 4 signed bytes into local host format
 */
signed long d_getsl(register const unsigned char *ptr)
{
  return
    (((  signed long) ptr[0] << 24) |
     ((unsigned long) ptr[1] << 16) |
     ((unsigned long) ptr[2] <<  8) |
     ((unsigned long) ptr[3] <<  0));
}

/*
 * NAME:        data->getul()
 * DESCRIPTION: marshal 4 unsigned bytes into local host format
 */
unsigned long d_getul(register const unsigned char *ptr)
{
  return
    (((unsigned long) ptr[0] << 24) |
     ((unsigned long) ptr[1] << 16) |
     ((unsigned long) ptr[2] <<  8) |
     ((unsigned long) ptr[3] <<  0));
}

/*
 * NAME:        data->putsb()
 * DESCRIPTION: marshal 1 signed byte out in big-endian format
 */
void d_putsb(register unsigned char *ptr,
             register signed char data)
{
  *ptr = data;
}

/*
 * NAME:        data->putub()
 * DESCRIPTION: marshal 1 unsigned byte out in big-endian format
 */
void d_putub(register unsigned char *ptr,
             register unsigned char data)
{
  *ptr = data;
}

/*
 * NAME:        data->putsw()
 * DESCRIPTION: marshal 2 signed bytes out in big-endian format
 */
void d_putsw(register unsigned char *ptr,
             register signed short data)
{
  *ptr++ = ((unsigned short) data & 0xff00) >> 8;
  *ptr   = ((unsigned short) data & 0x00ff) >> 0;
}

/*
 * NAME:        data->putuw()
 * DESCRIPTION: marshal 2 unsigned bytes out in big-endian format
 */
void d_putuw(register unsigned char *ptr,
             register unsigned short data)
{
  *ptr++ = (data & 0xff00) >> 8;
  *ptr   = (data & 0x00ff) >> 0;
}

/*
 * NAME:        data->putsl()
 * DESCRIPTION: marshal 4 signed bytes out in big-endian format
 */
void d_putsl(register unsigned char *ptr,
             register signed long data)
{
  *ptr++ = ((unsigned long) data & 0xff000000UL) >> 24;
  *ptr++ = ((unsigned long) data & 0x00ff0000UL) >> 16;
  *ptr++ = ((unsigned long) data & 0x0000ff00UL) >>  8;
  *ptr   = ((unsigned long) data & 0x000000ffUL) >>  0;
}

/*
 * NAME:        data->putul()
 * DESCRIPTION: marshal 4 unsigned bytes out in big-endian format
 */
void d_putul(register unsigned char *ptr,
             register unsigned long data)
{
  *ptr++ = (data & 0xff000000UL) >> 24;
  *ptr++ = (data & 0x00ff0000UL) >> 16;
  *ptr++ = (data & 0x0000ff00UL) >>  8;
  *ptr   = (data & 0x000000ffUL) >>  0;
}

/*
 * NAME:        data->fetchsb()
 * DESCRIPTION: incrementally retrieve a signed byte of data
 */
void d_fetchsb(register const unsigned char **ptr,
               register signed char *dest)
{
  *dest = *(*ptr)++;
}

/*
 * NAME:        data->fetchub()
 * DESCRIPTION: incrementally retrieve an unsigned byte of data
 */
void d_fetchub(register const unsigned char **ptr,
               register unsigned char *dest)
{
  *dest = *(*ptr)++;
}

/*
 * NAME:        data->fetchsw()
 * DESCRIPTION: incrementally retrieve a signed word of data
 */
void d_fetchsw(register const unsigned char **ptr,
               register signed short *dest)
{
  *dest =
    (((  signed short) (*ptr)[0] << 8) |
     ((unsigned short) (*ptr)[1] << 0));
  *ptr += 2;
}

/*
 * NAME:        data->fetchuw()
 * DESCRIPTION: incrementally retrieve an unsigned word of data
 */
void d_fetchuw(register const unsigned char **ptr,
               register unsigned short *dest)
{
  *dest =
    (((unsigned short) (*ptr)[0] << 8) |
     ((unsigned short) (*ptr)[1] << 0));
  *ptr += 2;
}

/*
 * NAME:        data->fetchsl()
 * DESCRIPTION: incrementally retrieve a signed long word of data
 */
void d_fetchsl(register const unsigned char **ptr,
               register signed long *dest)
{
  *dest =
    (((  signed long) (*ptr)[0] << 24) |
     ((unsigned long) (*ptr)[1] << 16) |
     ((unsigned long) (*ptr)[2] <<  8) |
     ((unsigned long) (*ptr)[3] <<  0));
  *ptr += 4;
}

/*
 * NAME:        data->fetchul()
 * DESCRIPTION: incrementally retrieve an unsigned long word of data
 */
void d_fetchul(register const unsigned char **ptr,
               register unsigned long *dest)
{
  *dest =
    (((unsigned long) (*ptr)[0] << 24) |
     ((unsigned long) (*ptr)[1] << 16) |
     ((unsigned long) (*ptr)[2] <<  8) |
     ((unsigned long) (*ptr)[3] <<  0));
  *ptr += 4;
}

/*
 * NAME:        data->storesb()
 * DESCRIPTION: incrementally store a signed byte of data
 */
void d_storesb(register unsigned char **ptr,
               register signed char data)
{
  *(*ptr)++ = data;
}

/*
 * NAME:        data->storeub()
 * DESCRIPTION: incrementally store an unsigned byte of data
 */
void d_storeub(register unsigned char **ptr,
               register unsigned char data)
{
  *(*ptr)++ = data;
}

/*
 * NAME:        data->storesw()
 * DESCRIPTION: incrementally store a signed word of data
 */
void d_storesw(register unsigned char **ptr,
               register signed short data)
{
  *(*ptr)++ = ((unsigned short) data & 0xff00) >> 8;
  *(*ptr)++ = ((unsigned short) data & 0x00ff) >> 0;
}

/*
 * NAME:        data->storeuw()
 * DESCRIPTION: incrementally store an unsigned word of data
 */
void d_storeuw(register unsigned char **ptr,
               register unsigned short data)
{
  *(*ptr)++ = (data & 0xff00) >> 8;
  *(*ptr)++ = (data & 0x00ff) >> 0;
}

/*
 * NAME:        data->storesl()
 * DESCRIPTION: incrementally store a signed long word of data
 */
void d_storesl(register unsigned char **ptr,
               register signed long data)
{
  *(*ptr)++ = ((unsigned long) data & 0xff000000UL) >> 24;
  *(*ptr)++ = ((unsigned long) data & 0x00ff0000UL) >> 16;
  *(*ptr)++ = ((unsigned long) data & 0x0000ff00UL) >>  8;
  *(*ptr)++ = ((unsigned long) data & 0x000000ffUL) >>  0;
}

/*
 * NAME:        data->storeul()
 * DESCRIPTION: incrementally store an unsigned long word of data
 */
void d_storeul(register unsigned char **ptr,
               register unsigned long data)
{
  *(*ptr)++ = (data & 0xff000000UL) >> 24;
  *(*ptr)++ = (data & 0x00ff0000UL) >> 16;
  *(*ptr)++ = (data & 0x0000ff00UL) >>  8;
  *(*ptr)++ = (data & 0x000000ffUL) >>  0;
}

/*
 * NAME:        data->fetchstr()
 * DESCRIPTION: incrementally retrieve a string
 */
void d_fetchstr(const unsigned char **ptr, char *dest, unsigned size)
{
  unsigned len;

  len = d_getub(*ptr);

  if (len > 0 && len < size)
    memcpy(dest, *ptr + 1, len);
  else
    len = 0;

  dest[len] = 0;

  *ptr += size;
}

/*
 * NAME:        data->storestr()
 * DESCRIPTION: incrementally store a string
 */
void d_storestr(unsigned char **ptr, const char *src, unsigned size)
{
  unsigned len;

  len = strlen(src);
  if (len > --size)
    len = 0;

  d_storeub(ptr, len);

  memcpy(*ptr, src, len);
  memset(*ptr + len, 0, size - len);

  *ptr += size;
}

/*
 * NAME:        data->relstring()
 * DESCRIPTION: compare two strings as per MacOS for HFS
 */
int d_relstring(const char *str1, const char *str2)
{
  register int diff;

  while (*str1 && *str2)
    {
      diff = hfs_charorder[(unsigned char) *str1] -
             hfs_charorder[(unsigned char) *str2];

      if (diff)
        return diff;

      ++str1, ++str2;
    }

  if (! *str1 && *str2)
    return -1;
  else if (*str1 && ! *str2)
    return 1;

  return 0;
}

/*
 * NAME:        calctzdiff()
 * DESCRIPTION: calculate the timezone difference between local time and UTC
 */
static
void calctzdiff(void)
{
# ifdef HAVE_MKTIME

  time_t t;
  int isdst;
  struct tm tm;
  const struct tm *tmp;

  time(&t);
  isdst = localtime(&t)->tm_isdst;

  tmp = gmtime(&t);
  if (tmp)
    {
      tm = *tmp;
      tm.tm_isdst = isdst;

      tzdiff = t - mktime(&tm);
    }
  else
    tzdiff = 0;

# else

  tzdiff = 0;

# endif
}

/*
 * NAME:        data->ltime()
 * DESCRIPTION: convert MacOS time to local time
 */
time_t d_ltime(unsigned long mtime)
{
  if (tzdiff == -1)
    calctzdiff();

  return (time_t) (mtime - TIMEDIFF) - tzdiff;
}

/*
 * NAME:        data->mtime()
 * DESCRIPTION: convert local time to MacOS time
 */
unsigned long d_mtime(time_t ltime)
{
  if (tzdiff == -1)
    calctzdiff();

  return (unsigned long) (ltime + tzdiff) + TIMEDIFF;
}
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	# ifdef HAVE_CONFIG_H
22	# include "config.h"
23	# endif
24
25	# include <string.h>
26	# include <time.h>
27
28	# ifdef TM_IN_SYS_TIME
29	# include <sys/time.h>
30	# endif
31
32	# include "data.h"
33
34	# define TIMEDIFF 2082844800UL
35
36	static
37	time_t tzdiff = -1;
38
39	const
40	unsigned char hfs_charorder[256] = {
41	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
42	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
43	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
44	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
45
46	0x20, 0x22, 0x23, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
47	0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
48	0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
49	0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
50
51	0x47, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
52	0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
53	0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
54	0xa3, 0xa5, 0xa8, 0xaa, 0xab, 0xac, 0xad, 0xae,
55
56	0x54, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
57	0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
58	0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
59	0xa3, 0xa5, 0xa8, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
60
61	0x4c, 0x50, 0x5c, 0x62, 0x7d, 0x81, 0x9a, 0x55,
62	0x4a, 0x56, 0x4c, 0x4e, 0x50, 0x5c, 0x62, 0x64,
63	0x65, 0x66, 0x6f, 0x70, 0x71, 0x72, 0x7d, 0x89,
64	0x8a, 0x8b, 0x81, 0x83, 0x9c, 0x9d, 0x9e, 0x9a,
65
66	0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0x95,
67	0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0x52, 0x85,
68	0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
69	0xc9, 0xca, 0xcb, 0x57, 0x8c, 0xcc, 0x52, 0x85,
70
71	0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0x26,
72	0x27, 0xd4, 0x20, 0x4a, 0x4e, 0x83, 0x87, 0x87,
73	0xd5, 0xd6, 0x24, 0x25, 0x2d, 0x2e, 0xd7, 0xd8,
74	0xa7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
75
76	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
77	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
78	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
79	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
80	};
81
82	/*
83	* NAME: data->getsb()
84	* DESCRIPTION: marshal 1 signed byte into local host format
85	*/
86	signed char d_getsb(register const unsigned char *ptr)
87	{
88	return ptr[0];
89	}
90
91	/*
92	* NAME: data->getub()
93	* DESCRIPTION: marshal 1 unsigned byte into local host format
94	*/
95	unsigned char d_getub(register const unsigned char *ptr)
96	{
97	return ptr[0];
98	}
99
100	/*
101	* NAME: data->getsw()
102	* DESCRIPTION: marshal 2 signed bytes into local host format
103	*/
104	signed short d_getsw(register const unsigned char *ptr)
105	{
106	return
107	((( signed short) ptr[0] << 8) \|
108	((unsigned short) ptr[1] << 0));
109	}
110
111	/*
112	* NAME: data->getuw()
113	* DESCRIPTION: marshal 2 unsigned bytes into local host format
114	*/
115	unsigned short d_getuw(register const unsigned char *ptr)
116	{
117	return
118	(((unsigned short) ptr[0] << 8) \|
119	((unsigned short) ptr[1] << 0));
120	}
121
122	/*
123	* NAME: data->getsl()
124	* DESCRIPTION: marshal 4 signed bytes into local host format
125	*/
126	signed long d_getsl(register const unsigned char *ptr)
127	{
128	return
129	((( signed long) ptr[0] << 24) \|
130	((unsigned long) ptr[1] << 16) \|
131	((unsigned long) ptr[2] << 8) \|
132	((unsigned long) ptr[3] << 0));
133	}
134
135	/*
136	* NAME: data->getul()
137	* DESCRIPTION: marshal 4 unsigned bytes into local host format
138	*/
139	unsigned long d_getul(register const unsigned char *ptr)
140	{
141	return
142	(((unsigned long) ptr[0] << 24) \|
143	((unsigned long) ptr[1] << 16) \|
144	((unsigned long) ptr[2] << 8) \|
145	((unsigned long) ptr[3] << 0));
146	}
147
148	/*
149	* NAME: data->putsb()
150	* DESCRIPTION: marshal 1 signed byte out in big-endian format
151	*/
152	void d_putsb(register unsigned char *ptr,
153	register signed char data)
154	{
155	*ptr = data;
156	}
157
158	/*
159	* NAME: data->putub()
160	* DESCRIPTION: marshal 1 unsigned byte out in big-endian format
161	*/
162	void d_putub(register unsigned char *ptr,
163	register unsigned char data)
164	{
165	*ptr = data;
166	}
167
168	/*
169	* NAME: data->putsw()
170	* DESCRIPTION: marshal 2 signed bytes out in big-endian format
171	*/
172	void d_putsw(register unsigned char *ptr,
173	register signed short data)
174	{
175	*ptr++ = ((unsigned short) data & 0xff00) >> 8;
176	*ptr = ((unsigned short) data & 0x00ff) >> 0;
177	}
178
179	/*
180	* NAME: data->putuw()
181	* DESCRIPTION: marshal 2 unsigned bytes out in big-endian format
182	*/
183	void d_putuw(register unsigned char *ptr,
184	register unsigned short data)
185	{
186	*ptr++ = (data & 0xff00) >> 8;
187	*ptr = (data & 0x00ff) >> 0;
188	}
189
190	/*
191	* NAME: data->putsl()
192	* DESCRIPTION: marshal 4 signed bytes out in big-endian format
193	*/
194	void d_putsl(register unsigned char *ptr,
195	register signed long data)
196	{
197	*ptr++ = ((unsigned long) data & 0xff000000UL) >> 24;
198	*ptr++ = ((unsigned long) data & 0x00ff0000UL) >> 16;
199	*ptr++ = ((unsigned long) data & 0x0000ff00UL) >> 8;
200	*ptr = ((unsigned long) data & 0x000000ffUL) >> 0;
201	}
202
203	/*
204	* NAME: data->putul()
205	* DESCRIPTION: marshal 4 unsigned bytes out in big-endian format
206	*/
207	void d_putul(register unsigned char *ptr,
208	register unsigned long data)
209	{
210	*ptr++ = (data & 0xff000000UL) >> 24;
211	*ptr++ = (data & 0x00ff0000UL) >> 16;
212	*ptr++ = (data & 0x0000ff00UL) >> 8;
213	*ptr = (data & 0x000000ffUL) >> 0;
214	}
215
216	/*
217	* NAME: data->fetchsb()
218	* DESCRIPTION: incrementally retrieve a signed byte of data
219	*/
220	void d_fetchsb(register const unsigned char **ptr,
221	register signed char *dest)
222	{
223	dest = (*ptr)++;
224	}
225
226	/*
227	* NAME: data->fetchub()
228	* DESCRIPTION: incrementally retrieve an unsigned byte of data
229	*/
230	void d_fetchub(register const unsigned char **ptr,
231	register unsigned char *dest)
232	{
233	dest = (*ptr)++;
234	}
235
236	/*
237	* NAME: data->fetchsw()
238	* DESCRIPTION: incrementally retrieve a signed word of data
239	*/
240	void d_fetchsw(register const unsigned char **ptr,
241	register signed short *dest)
242	{
243	*dest =
244	((( signed short) (*ptr)[0] << 8) \|
245	((unsigned short) (*ptr)[1] << 0));
246	*ptr += 2;
247	}
248
249	/*
250	* NAME: data->fetchuw()
251	* DESCRIPTION: incrementally retrieve an unsigned word of data
252	*/
253	void d_fetchuw(register const unsigned char **ptr,
254	register unsigned short *dest)
255	{
256	*dest =
257	(((unsigned short) (*ptr)[0] << 8) \|
258	((unsigned short) (*ptr)[1] << 0));
259	*ptr += 2;
260	}
261
262	/*
263	* NAME: data->fetchsl()
264	* DESCRIPTION: incrementally retrieve a signed long word of data
265	*/
266	void d_fetchsl(register const unsigned char **ptr,
267	register signed long *dest)
268	{
269	*dest =
270	((( signed long) (*ptr)[0] << 24) \|
271	((unsigned long) (*ptr)[1] << 16) \|
272	((unsigned long) (*ptr)[2] << 8) \|
273	((unsigned long) (*ptr)[3] << 0));
274	*ptr += 4;
275	}
276
277	/*
278	* NAME: data->fetchul()
279	* DESCRIPTION: incrementally retrieve an unsigned long word of data
280	*/
281	void d_fetchul(register const unsigned char **ptr,
282	register unsigned long *dest)
283	{
284	*dest =
285	(((unsigned long) (*ptr)[0] << 24) \|
286	((unsigned long) (*ptr)[1] << 16) \|
287	((unsigned long) (*ptr)[2] << 8) \|
288	((unsigned long) (*ptr)[3] << 0));
289	*ptr += 4;
290	}
291
292	/*
293	* NAME: data->storesb()
294	* DESCRIPTION: incrementally store a signed byte of data
295	*/
296	void d_storesb(register unsigned char **ptr,
297	register signed char data)
298	{
299	(ptr)++ = data;
300	}
301
302	/*
303	* NAME: data->storeub()
304	* DESCRIPTION: incrementally store an unsigned byte of data
305	*/
306	void d_storeub(register unsigned char **ptr,
307	register unsigned char data)
308	{
309	(ptr)++ = data;
310	}
311
312	/*
313	* NAME: data->storesw()
314	* DESCRIPTION: incrementally store a signed word of data
315	*/
316	void d_storesw(register unsigned char **ptr,
317	register signed short data)
318	{
319	(ptr)++ = ((unsigned short) data & 0xff00) >> 8;
320	(ptr)++ = ((unsigned short) data & 0x00ff) >> 0;
321	}
322
323	/*
324	* NAME: data->storeuw()
325	* DESCRIPTION: incrementally store an unsigned word of data
326	*/
327	void d_storeuw(register unsigned char **ptr,
328	register unsigned short data)
329	{
330	(ptr)++ = (data & 0xff00) >> 8;
331	(ptr)++ = (data & 0x00ff) >> 0;
332	}
333
334	/*
335	* NAME: data->storesl()
336	* DESCRIPTION: incrementally store a signed long word of data
337	*/
338	void d_storesl(register unsigned char **ptr,
339	register signed long data)
340	{
341	(ptr)++ = ((unsigned long) data & 0xff000000UL) >> 24;
342	(ptr)++ = ((unsigned long) data & 0x00ff0000UL) >> 16;
343	(ptr)++ = ((unsigned long) data & 0x0000ff00UL) >> 8;
344	(ptr)++ = ((unsigned long) data & 0x000000ffUL) >> 0;
345	}
346
347	/*
348	* NAME: data->storeul()
349	* DESCRIPTION: incrementally store an unsigned long word of data
350	*/
351	void d_storeul(register unsigned char **ptr,
352	register unsigned long data)
353	{
354	(ptr)++ = (data & 0xff000000UL) >> 24;
355	(ptr)++ = (data & 0x00ff0000UL) >> 16;
356	(ptr)++ = (data & 0x0000ff00UL) >> 8;
357	(ptr)++ = (data & 0x000000ffUL) >> 0;
358	}
359
360	/*
361	* NAME: data->fetchstr()
362	* DESCRIPTION: incrementally retrieve a string
363	*/
364	void d_fetchstr(const unsigned char *ptr, char dest, unsigned size)
365	{
366	unsigned len;
367
368	len = d_getub(*ptr);
369
370	if (len > 0 && len < size)
371	memcpy(dest, *ptr + 1, len);
372	else
373	len = 0;
374
375	dest[len] = 0;
376
377	*ptr += size;
378	}
379
380	/*
381	* NAME: data->storestr()
382	* DESCRIPTION: incrementally store a string
383	*/
384	void d_storestr(unsigned char *ptr, const char src, unsigned size)
385	{
386	unsigned len;
387
388	len = strlen(src);
389	if (len > --size)
390	len = 0;
391
392	d_storeub(ptr, len);
393
394	memcpy(*ptr, src, len);
395	memset(*ptr + len, 0, size - len);
396
397	*ptr += size;
398	}
399
400	/*
401	* NAME: data->relstring()
402	* DESCRIPTION: compare two strings as per MacOS for HFS
403	*/
404	int d_relstring(const char str1, const char str2)
405	{
406	register int diff;
407
408	while (str1 && str2)
409	{
410	diff = hfs_charorder[(unsigned char) *str1] -
411	hfs_charorder[(unsigned char) *str2];
412
413	if (diff)
414	return diff;
415
416	++str1, ++str2;
417	}
418
419	if (! str1 && str2)
420	return -1;
421	else if (str1 && ! str2)
422	return 1;
423
424	return 0;
425	}
426
427	/*
428	* NAME: calctzdiff()
429	* DESCRIPTION: calculate the timezone difference between local time and UTC
430	*/
431	static
432	void calctzdiff(void)
433	{
434	# ifdef HAVE_MKTIME
435
436	time_t t;
437	int isdst;
438	struct tm tm;
439	const struct tm *tmp;
440
441	time(&t);
442	isdst = localtime(&t)->tm_isdst;
443
444	tmp = gmtime(&t);
445	if (tmp)
446	{
447	tm = *tmp;
448	tm.tm_isdst = isdst;
449
450	tzdiff = t - mktime(&tm);
451	}
452	else
453	tzdiff = 0;
454
455	# else
456
457	tzdiff = 0;
458
459	# endif
460	}
461
462	/*
463	* NAME: data->ltime()
464	* DESCRIPTION: convert MacOS time to local time
465	*/
466	time_t d_ltime(unsigned long mtime)
467	{
468	if (tzdiff == -1)
469	calctzdiff();
470
471	return (time_t) (mtime - TIMEDIFF) - tzdiff;
472	}
473
474	/*
475	* NAME: data->mtime()
476	* DESCRIPTION: convert local time to MacOS time
477	*/
478	unsigned long d_mtime(time_t ltime)
479	{
480	if (tzdiff == -1)
481	calctzdiff();
482
483	return (unsigned long) (ltime + tzdiff) + TIMEDIFF;
484	}