/*
* 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., 51 Franklin Street - Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* $Id: data.c,v 1.7 1998/11/02 22:08:57 rob Exp $
*/
#include "config.h"
#include "data.h"
#define TIMEDIFF 2082844800UL
static
time_t tzdiff = -1;
static 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;
}