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	dpavlin	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			}