freebsd-nq/usr.sbin/makefs/cd9660/cd9660_conversion.c

203 lines
4.8 KiB
C
Raw Normal View History

/* $NetBSD: cd9660_conversion.c,v 1.4 2007/03/14 14:11:17 christos Exp $ */
/*
* Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan
* Perez-Rathke and Ram Vedam. All rights reserved.
*
* This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys,
* Alan Perez-Rathke and Ram Vedam.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN
* GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN
* GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include "cd9660.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/endian.h>
static char cd9660_compute_gm_offset(time_t);
#if 0
static inline int
cd9660_pad_even(length)
int length;
{
return length + (length & 0x01);
}
#endif
/*
* These can probably be implemented using a macro
*/
/* Little endian */
void
cd9660_721(uint16_t w, unsigned char *twochar)
{
#if BYTE_ORDER == BIG_ENDIAN
w = bswap16(w);
#endif
memcpy(twochar,&w,2);
}
void
cd9660_731(uint32_t w, unsigned char *fourchar)
{
#if BYTE_ORDER == BIG_ENDIAN
w = bswap32(w);
#endif
memcpy(fourchar,&w,4);
}
/* Big endian */
void
cd9660_722(uint16_t w, unsigned char *twochar)
{
#if BYTE_ORDER == LITTLE_ENDIAN
w = bswap16(w);
#endif
memcpy(twochar,&w,2);
}
void
cd9660_732(uint32_t w, unsigned char *fourchar)
{
#if BYTE_ORDER == LITTLE_ENDIAN
w = bswap32(w);
#endif
memcpy(fourchar,&w,4);
}
/**
* Convert a dword into a double endian string of eight characters
* @param int The double word to convert
* @param char* The string to write the both endian double word to - It is assumed this is allocated and at least
* eight characters long
*/
void
cd9660_bothendian_dword(uint32_t dw, unsigned char *eightchar)
{
uint32_t le, be;
#if BYTE_ORDER == LITTLE_ENDIAN
le = dw;
be = bswap32(dw);
#endif
#if BYTE_ORDER == BIG_ENDIAN
be = dw;
le = bswap32(dw);
#endif
memcpy(eightchar, &le, 4);
memcpy((eightchar+4), &be, 4);
}
/**
* Convert a word into a double endian string of four characters
* @param int The word to convert
* @param char* The string to write the both endian word to - It is assumed this is allocated and at least
* four characters long
*/
void
cd9660_bothendian_word(uint16_t dw, unsigned char *fourchar)
{
uint16_t le, be;
#if BYTE_ORDER == LITTLE_ENDIAN
le = dw;
be = bswap16(dw);
#endif
#if BYTE_ORDER == BIG_ENDIAN
be = dw;
le = bswap16(dw);
#endif
memcpy(fourchar, &le, 2);
memcpy((fourchar+2), &be, 2);
}
void
cd9660_pad_string_spaces(char *str, int len)
{
int i;
for (i = 0; i < len; i ++) {
if (str[i] == '\0')
str[i] = 0x20;
}
}
static char
cd9660_compute_gm_offset(time_t tim)
{
struct tm t, gm;
(void)localtime_r(&tim, &t);
(void)gmtime_r(&tim, &gm);
gm.tm_year -= t.tm_year;
gm.tm_yday -= t.tm_yday;
gm.tm_hour -= t.tm_hour;
gm.tm_min -= t.tm_min;
if (gm.tm_year < 0)
gm.tm_yday = -1;
else if (gm.tm_year > 0)
gm.tm_yday = 1;
return (char)(-(gm.tm_min + 60* (24 * gm.tm_yday + gm.tm_hour)) / 15);
}
/* Long dates: 17 characters */
void
cd9660_time_8426(unsigned char *buf, time_t tim)
{
struct tm t;
char temp[18];
(void)localtime_r(&tim, &t);
(void)snprintf(temp, sizeof(temp), "%04i%02i%02i%02i%02i%02i%02i",
1900+(int)t.tm_year,
(int)t.tm_mon+1,
(int)t.tm_mday,
(int)t.tm_hour,
(int)t.tm_min,
(int)t.tm_sec,
0);
(void)memcpy(buf, temp, 16);
buf[16] = cd9660_compute_gm_offset(tim);
}
/* Short dates: 7 characters */
void
cd9660_time_915(unsigned char *buf, time_t tim)
{
struct tm t;
(void)localtime_r(&tim, &t);
buf[0] = t.tm_year;
buf[1] = t.tm_mon+1;
buf[2] = t.tm_mday;
buf[3] = t.tm_hour;
buf[4] = t.tm_min;
buf[5] = t.tm_sec;
buf[6] = cd9660_compute_gm_offset(tim);
}