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