/* * 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. * * $Id: data.c,v 1.5 1998/04/11 08:27:18 rob Exp $ */ # 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 statictime_t tzdiff = -1; constunsigned 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(const unsigned char *ptr){  return ptr[0];} /* * NAME:	data->getub() * DESCRIPTION:	marshal 1 unsigned byte into local host format */unsigned char d_getub(const unsigned char *ptr){  return ptr[0];} /* * NAME:	data->getsw() * DESCRIPTION:	marshal 2 signed bytes into local host format */signed short d_getsw(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(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(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(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(unsigned char *ptr, signed char data){  *ptr = data;} /* * NAME:	data->putub() * DESCRIPTION:	marshal 1 unsigned byte out in big-endian format */void d_putub(unsigned char *ptr, unsigned char data){  *ptr = data;} /* * NAME:	data->putsw() * DESCRIPTION:	marshal 2 signed bytes out in big-endian format */void d_putsw(unsigned char *ptr, 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(unsigned char *ptr, 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(unsigned char *ptr, 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(unsigned char *ptr, 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(const unsigned char **ptr, signed char *dest){  *dest = *(*ptr)++;} /* * NAME:	data->fetchub() * DESCRIPTION:	incrementally retrieve an unsigned byte of data */void d_fetchub(const unsigned char **ptr, unsigned char *dest){  *dest = *(*ptr)++;} /* * NAME:	data->fetchsw() * DESCRIPTION:	incrementally retrieve a signed word of data */void d_fetchsw(const unsigned char **ptr, 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(const unsigned char **ptr, 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(const unsigned char **ptr, 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(const unsigned char **ptr, 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(unsigned char **ptr, signed char data){  *(*ptr)++ = data;} /* * NAME:	data->storeub() * DESCRIPTION:	incrementally store an unsigned byte of data */void d_storeub(unsigned char **ptr, unsigned char data){  *(*ptr)++ = data;} /* * NAME:	data->storesw() * DESCRIPTION:	incrementally store a signed word of data */void d_storesw(unsigned char **ptr, 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(unsigned char **ptr, 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(unsigned char **ptr, 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(unsigned char **ptr, 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 */staticvoid 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;}