mirror of
https://github.com/JotaRandom/hfsutils.git
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468 lines
10 KiB
C
468 lines
10 KiB
C
/*
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* libhfs - library for reading and writing Macintosh HFS volumes
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* Copyright (C) 1996-1998 Robert Leslie
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: data.c,v 1.5 1998/04/11 08:27:18 rob Exp $
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*/
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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# include <string.h>
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# include <time.h>
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# ifdef TM_IN_SYS_TIME
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# include <sys/time.h>
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# endif
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# include "data.h"
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# define TIMEDIFF 2082844800UL
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static
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time_t tzdiff = -1;
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const
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unsigned char hfs_charorder[256] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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0x20, 0x22, 0x23, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
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0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
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0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
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0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
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0x47, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
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0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
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0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
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0xa3, 0xa5, 0xa8, 0xaa, 0xab, 0xac, 0xad, 0xae,
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0x54, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
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0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
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0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
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0xa3, 0xa5, 0xa8, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
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0x4c, 0x50, 0x5c, 0x62, 0x7d, 0x81, 0x9a, 0x55,
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0x4a, 0x56, 0x4c, 0x4e, 0x50, 0x5c, 0x62, 0x64,
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0x65, 0x66, 0x6f, 0x70, 0x71, 0x72, 0x7d, 0x89,
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0x8a, 0x8b, 0x81, 0x83, 0x9c, 0x9d, 0x9e, 0x9a,
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0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0x95,
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0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0x52, 0x85,
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0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
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0xc9, 0xca, 0xcb, 0x57, 0x8c, 0xcc, 0x52, 0x85,
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0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0x26,
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0x27, 0xd4, 0x20, 0x4a, 0x4e, 0x83, 0x87, 0x87,
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0xd5, 0xd6, 0x24, 0x25, 0x2d, 0x2e, 0xd7, 0xd8,
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0xa7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
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0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
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0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
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0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
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};
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/*
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* NAME: data->getsb()
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* DESCRIPTION: marshal 1 signed byte into local host format
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*/
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signed char d_getsb(const unsigned char *ptr)
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{
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return ptr[0];
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}
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/*
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* NAME: data->getub()
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* DESCRIPTION: marshal 1 unsigned byte into local host format
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*/
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unsigned char d_getub(const unsigned char *ptr)
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{
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return ptr[0];
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}
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/*
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* NAME: data->getsw()
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* DESCRIPTION: marshal 2 signed bytes into local host format
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*/
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signed short d_getsw(const unsigned char *ptr)
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{
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return
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((( signed short) ptr[0] << 8) |
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((unsigned short) ptr[1] << 0));
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}
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/*
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* NAME: data->getuw()
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* DESCRIPTION: marshal 2 unsigned bytes into local host format
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*/
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unsigned short d_getuw(const unsigned char *ptr)
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{
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return
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(((unsigned short) ptr[0] << 8) |
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((unsigned short) ptr[1] << 0));
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}
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/*
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* NAME: data->getsl()
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* DESCRIPTION: marshal 4 signed bytes into local host format
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*/
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signed long d_getsl(const unsigned char *ptr)
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{
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return
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((( signed long) ptr[0] << 24) |
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((unsigned long) ptr[1] << 16) |
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((unsigned long) ptr[2] << 8) |
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((unsigned long) ptr[3] << 0));
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}
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/*
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* NAME: data->getul()
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* DESCRIPTION: marshal 4 unsigned bytes into local host format
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*/
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unsigned long d_getul(const unsigned char *ptr)
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{
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return
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(((unsigned long) ptr[0] << 24) |
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((unsigned long) ptr[1] << 16) |
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((unsigned long) ptr[2] << 8) |
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((unsigned long) ptr[3] << 0));
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}
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/*
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* NAME: data->putsb()
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* DESCRIPTION: marshal 1 signed byte out in big-endian format
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*/
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void d_putsb(unsigned char *ptr, signed char data)
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{
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*ptr = data;
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}
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/*
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* NAME: data->putub()
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* DESCRIPTION: marshal 1 unsigned byte out in big-endian format
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*/
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void d_putub(unsigned char *ptr, unsigned char data)
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{
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*ptr = data;
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}
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/*
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* NAME: data->putsw()
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* DESCRIPTION: marshal 2 signed bytes out in big-endian format
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*/
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void d_putsw(unsigned char *ptr, signed short data)
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{
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*ptr++ = ((unsigned short) data & 0xff00) >> 8;
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*ptr = ((unsigned short) data & 0x00ff) >> 0;
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}
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/*
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* NAME: data->putuw()
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* DESCRIPTION: marshal 2 unsigned bytes out in big-endian format
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*/
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void d_putuw(unsigned char *ptr, unsigned short data)
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{
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*ptr++ = (data & 0xff00) >> 8;
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*ptr = (data & 0x00ff) >> 0;
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}
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/*
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* NAME: data->putsl()
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* DESCRIPTION: marshal 4 signed bytes out in big-endian format
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*/
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void d_putsl(unsigned char *ptr, signed long data)
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{
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*ptr++ = ((unsigned long) data & 0xff000000UL) >> 24;
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*ptr++ = ((unsigned long) data & 0x00ff0000UL) >> 16;
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*ptr++ = ((unsigned long) data & 0x0000ff00UL) >> 8;
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*ptr = ((unsigned long) data & 0x000000ffUL) >> 0;
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}
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/*
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* NAME: data->putul()
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* DESCRIPTION: marshal 4 unsigned bytes out in big-endian format
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*/
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void d_putul(unsigned char *ptr, unsigned long data)
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{
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*ptr++ = (data & 0xff000000UL) >> 24;
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*ptr++ = (data & 0x00ff0000UL) >> 16;
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*ptr++ = (data & 0x0000ff00UL) >> 8;
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*ptr = (data & 0x000000ffUL) >> 0;
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}
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/*
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* NAME: data->fetchsb()
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* DESCRIPTION: incrementally retrieve a signed byte of data
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*/
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void d_fetchsb(const unsigned char **ptr, signed char *dest)
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{
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*dest = *(*ptr)++;
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}
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/*
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* NAME: data->fetchub()
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* DESCRIPTION: incrementally retrieve an unsigned byte of data
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*/
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void d_fetchub(const unsigned char **ptr, unsigned char *dest)
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{
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*dest = *(*ptr)++;
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}
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/*
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* NAME: data->fetchsw()
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* DESCRIPTION: incrementally retrieve a signed word of data
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*/
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void d_fetchsw(const unsigned char **ptr, signed short *dest)
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{
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*dest =
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((( signed short) (*ptr)[0] << 8) |
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((unsigned short) (*ptr)[1] << 0));
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*ptr += 2;
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}
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/*
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* NAME: data->fetchuw()
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* DESCRIPTION: incrementally retrieve an unsigned word of data
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*/
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void d_fetchuw(const unsigned char **ptr, unsigned short *dest)
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{
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*dest =
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(((unsigned short) (*ptr)[0] << 8) |
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((unsigned short) (*ptr)[1] << 0));
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*ptr += 2;
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}
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/*
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* NAME: data->fetchsl()
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* DESCRIPTION: incrementally retrieve a signed long word of data
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*/
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void d_fetchsl(const unsigned char **ptr, signed long *dest)
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{
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*dest =
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((( signed long) (*ptr)[0] << 24) |
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((unsigned long) (*ptr)[1] << 16) |
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((unsigned long) (*ptr)[2] << 8) |
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((unsigned long) (*ptr)[3] << 0));
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*ptr += 4;
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}
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/*
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* NAME: data->fetchul()
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* DESCRIPTION: incrementally retrieve an unsigned long word of data
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*/
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void d_fetchul(const unsigned char **ptr, unsigned long *dest)
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{
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*dest =
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(((unsigned long) (*ptr)[0] << 24) |
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((unsigned long) (*ptr)[1] << 16) |
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((unsigned long) (*ptr)[2] << 8) |
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((unsigned long) (*ptr)[3] << 0));
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*ptr += 4;
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}
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/*
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* NAME: data->storesb()
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* DESCRIPTION: incrementally store a signed byte of data
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*/
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void d_storesb(unsigned char **ptr, signed char data)
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{
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*(*ptr)++ = data;
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}
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/*
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* NAME: data->storeub()
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* DESCRIPTION: incrementally store an unsigned byte of data
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*/
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void d_storeub(unsigned char **ptr, unsigned char data)
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{
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*(*ptr)++ = data;
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}
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/*
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* NAME: data->storesw()
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* DESCRIPTION: incrementally store a signed word of data
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*/
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void d_storesw(unsigned char **ptr, signed short data)
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{
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*(*ptr)++ = ((unsigned short) data & 0xff00) >> 8;
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*(*ptr)++ = ((unsigned short) data & 0x00ff) >> 0;
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}
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/*
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* NAME: data->storeuw()
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* DESCRIPTION: incrementally store an unsigned word of data
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*/
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void d_storeuw(unsigned char **ptr, unsigned short data)
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{
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*(*ptr)++ = (data & 0xff00) >> 8;
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*(*ptr)++ = (data & 0x00ff) >> 0;
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}
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/*
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* NAME: data->storesl()
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* DESCRIPTION: incrementally store a signed long word of data
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*/
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void d_storesl(unsigned char **ptr, signed long data)
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{
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*(*ptr)++ = ((unsigned long) data & 0xff000000UL) >> 24;
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*(*ptr)++ = ((unsigned long) data & 0x00ff0000UL) >> 16;
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*(*ptr)++ = ((unsigned long) data & 0x0000ff00UL) >> 8;
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*(*ptr)++ = ((unsigned long) data & 0x000000ffUL) >> 0;
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}
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/*
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* NAME: data->storeul()
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* DESCRIPTION: incrementally store an unsigned long word of data
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*/
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void d_storeul(unsigned char **ptr, unsigned long data)
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{
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*(*ptr)++ = (data & 0xff000000UL) >> 24;
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*(*ptr)++ = (data & 0x00ff0000UL) >> 16;
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*(*ptr)++ = (data & 0x0000ff00UL) >> 8;
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*(*ptr)++ = (data & 0x000000ffUL) >> 0;
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}
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/*
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* NAME: data->fetchstr()
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* DESCRIPTION: incrementally retrieve a string
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*/
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void d_fetchstr(const unsigned char **ptr, char *dest, unsigned size)
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{
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unsigned len;
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len = d_getub(*ptr);
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if (len > 0 && len < size)
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memcpy(dest, *ptr + 1, len);
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else
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len = 0;
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dest[len] = 0;
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*ptr += size;
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}
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/*
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* NAME: data->storestr()
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* DESCRIPTION: incrementally store a string
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*/
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void d_storestr(unsigned char **ptr, const char *src, unsigned size)
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{
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unsigned len;
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len = strlen(src);
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if (len > --size)
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len = 0;
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d_storeub(ptr, len);
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memcpy(*ptr, src, len);
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memset(*ptr + len, 0, size - len);
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*ptr += size;
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}
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/*
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* NAME: data->relstring()
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* DESCRIPTION: compare two strings as per MacOS for HFS
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*/
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int d_relstring(const char *str1, const char *str2)
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{
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register int diff;
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while (*str1 && *str2)
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{
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diff = hfs_charorder[(unsigned char) *str1] -
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hfs_charorder[(unsigned char) *str2];
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if (diff)
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return diff;
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++str1, ++str2;
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}
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if (! *str1 && *str2)
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return -1;
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else if (*str1 && ! *str2)
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return 1;
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return 0;
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}
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/*
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* NAME: calctzdiff()
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* DESCRIPTION: calculate the timezone difference between local time and UTC
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*/
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static
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void calctzdiff(void)
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{
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# ifdef HAVE_MKTIME
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time_t t;
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int isdst;
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struct tm tm;
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const struct tm *tmp;
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time(&t);
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isdst = localtime(&t)->tm_isdst;
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tmp = gmtime(&t);
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if (tmp)
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{
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tm = *tmp;
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tm.tm_isdst = isdst;
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tzdiff = t - mktime(&tm);
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}
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else
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tzdiff = 0;
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# else
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tzdiff = 0;
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# endif
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}
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/*
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* NAME: data->ltime()
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* DESCRIPTION: convert MacOS time to local time
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*/
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time_t d_ltime(unsigned long mtime)
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{
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if (tzdiff == -1)
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calctzdiff();
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return (time_t) (mtime - TIMEDIFF) - tzdiff;
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}
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/*
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* NAME: data->mtime()
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* DESCRIPTION: convert local time to MacOS time
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*/
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unsigned long d_mtime(time_t ltime)
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{
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if (tzdiff == -1)
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calctzdiff();
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return (unsigned long) (ltime + tzdiff) + TIMEDIFF;
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}
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