1 /* $NetBSD: cd9660_conversion.c,v 1.4 2007/03/14 14:11:17 christos Exp $ */
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
6 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan
7 * Perez-Rathke and Ram Vedam. All rights reserved.
9 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys,
10 * Alan Perez-Rathke and Ram Vedam.
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials provided
20 * with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN
23 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN
27 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
30 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
31 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 static char cd9660_compute_gm_offset(time_t);
45 cd9660_pad_even(length)
48 return length + (length & 0x01);
53 * These can probably be implemented using a macro
58 cd9660_721(uint16_t w, unsigned char *twochar)
60 #if BYTE_ORDER == BIG_ENDIAN
67 cd9660_731(uint32_t w, unsigned char *fourchar)
69 #if BYTE_ORDER == BIG_ENDIAN
72 memcpy(fourchar,&w,4);
77 cd9660_722(uint16_t w, unsigned char *twochar)
79 #if BYTE_ORDER == LITTLE_ENDIAN
86 cd9660_732(uint32_t w, unsigned char *fourchar)
88 #if BYTE_ORDER == LITTLE_ENDIAN
91 memcpy(fourchar,&w,4);
95 * Convert a dword into a double endian string of eight characters
96 * @param int The double word to convert
97 * @param char* The string to write the both endian double word to - It is assumed this is allocated and at least
98 * eight characters long
101 cd9660_bothendian_dword(uint32_t dw, unsigned char *eightchar)
104 #if BYTE_ORDER == LITTLE_ENDIAN
108 #if BYTE_ORDER == BIG_ENDIAN
112 memcpy(eightchar, &le, 4);
113 memcpy((eightchar+4), &be, 4);
117 * Convert a word into a double endian string of four characters
118 * @param int The word to convert
119 * @param char* The string to write the both endian word to - It is assumed this is allocated and at least
120 * four characters long
123 cd9660_bothendian_word(uint16_t dw, unsigned char *fourchar)
126 #if BYTE_ORDER == LITTLE_ENDIAN
130 #if BYTE_ORDER == BIG_ENDIAN
134 memcpy(fourchar, &le, 2);
135 memcpy((fourchar+2), &be, 2);
139 cd9660_pad_string_spaces(char *str, int len)
143 for (i = 0; i < len; i ++) {
150 cd9660_compute_gm_offset(time_t tim)
154 (void)localtime_r(&tim, &t);
155 (void)gmtime_r(&tim, &gm);
156 gm.tm_year -= t.tm_year;
157 gm.tm_yday -= t.tm_yday;
158 gm.tm_hour -= t.tm_hour;
159 gm.tm_min -= t.tm_min;
162 else if (gm.tm_year > 0)
165 return (char)(-(gm.tm_min + 60* (24 * gm.tm_yday + gm.tm_hour)) / 15);
168 /* Long dates: 17 characters */
170 cd9660_time_8426(unsigned char *buf, time_t tim)
175 (void)localtime_r(&tim, &t);
176 (void)snprintf(temp, sizeof(temp), "%04i%02i%02i%02i%02i%02i%02i",
184 (void)memcpy(buf, temp, 16);
185 buf[16] = cd9660_compute_gm_offset(tim);
188 /* Short dates: 7 characters */
190 cd9660_time_915(unsigned char *buf, time_t tim)
194 (void)localtime_r(&tim, &t);
201 buf[6] = cd9660_compute_gm_offset(tim);