cd9660_conversion.c revision 330449 
1/*	$NetBSD: cd9660_conversion.c,v 1.4 2007/03/14 14:11:17 christos Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5 *
6 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan
7 * Perez-Rathke and Ram Vedam.  All rights reserved.
8 *
9 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys,
10 * Alan Perez-Rathke and Ram Vedam.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
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.
21 *
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
34 * OF SUCH DAMAGE.
35 */
36#include "cd9660.h"
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: stable/11/usr.sbin/makefs/cd9660/cd9660_conversion.c 330449 2018-03-05 07:26:05Z eadler $");
40
41static char cd9660_compute_gm_offset(time_t);
42
43#if 0
44static inline int
45cd9660_pad_even(length)
46int length;
47{
48	return length + (length & 0x01);
49}
50#endif
51
52/*
53* These can probably be implemented using a macro
54*/
55
56/* Little endian */
57void
58cd9660_721(uint16_t w, unsigned char *twochar)
59{
60#if BYTE_ORDER == BIG_ENDIAN
61	w = bswap16(w);
62#endif
63	memcpy(twochar,&w,2);
64}
65
66void
67cd9660_731(uint32_t w, unsigned char *fourchar)
68{
69#if BYTE_ORDER == BIG_ENDIAN
70	w = bswap32(w);
71#endif
72	memcpy(fourchar,&w,4);
73}
74
75/* Big endian */
76void
77cd9660_722(uint16_t w, unsigned char *twochar)
78{
79#if BYTE_ORDER == LITTLE_ENDIAN
80	w = bswap16(w);
81#endif
82	memcpy(twochar,&w,2);
83}
84
85void
86cd9660_732(uint32_t w, unsigned char *fourchar)
87{
88#if BYTE_ORDER == LITTLE_ENDIAN
89	w = bswap32(w);
90#endif
91	memcpy(fourchar,&w,4);
92}
93
94/**
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
99*/
100void
101cd9660_bothendian_dword(uint32_t dw, unsigned char *eightchar)
102{
103	uint32_t le, be;
104#if BYTE_ORDER == LITTLE_ENDIAN
105	le = dw;
106	be = bswap32(dw);
107#endif
108#if BYTE_ORDER == BIG_ENDIAN
109	be = dw;
110	le = bswap32(dw);
111#endif
112	memcpy(eightchar, &le, 4);
113	memcpy((eightchar+4), &be, 4);
114}
115
116/**
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
121*/
122void
123cd9660_bothendian_word(uint16_t dw, unsigned char *fourchar)
124{
125	uint16_t le, be;
126#if BYTE_ORDER == LITTLE_ENDIAN
127	le = dw;
128	be = bswap16(dw);
129#endif
130#if BYTE_ORDER == BIG_ENDIAN
131	be = dw;
132	le = bswap16(dw);
133#endif
134	memcpy(fourchar, &le, 2);
135	memcpy((fourchar+2), &be, 2);
136}
137
138void
139cd9660_pad_string_spaces(char *str, int len)
140{
141	int i;
142
143	for (i = 0; i < len; i ++) {
144		if (str[i] == '\0')
145			str[i] = 0x20;
146	}
147}
148
149static char
150cd9660_compute_gm_offset(time_t tim)
151{
152	struct tm t, gm;
153
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;
160	if (gm.tm_year < 0)
161		gm.tm_yday = -1;
162	else if (gm.tm_year > 0)
163		gm.tm_yday = 1;
164
165	return (char)(-(gm.tm_min + 60* (24 * gm.tm_yday + gm.tm_hour)) / 15);
166}
167
168/* Long dates: 17 characters */
169void
170cd9660_time_8426(unsigned char *buf, time_t tim)
171{
172	struct tm t;
173	char temp[18];
174
175	(void)localtime_r(&tim, &t);
176	(void)snprintf(temp, sizeof(temp), "%04i%02i%02i%02i%02i%02i%02i",
177		1900+(int)t.tm_year,
178		(int)t.tm_mon+1,
179		(int)t.tm_mday,
180		(int)t.tm_hour,
181		(int)t.tm_min,
182		(int)t.tm_sec,
183		0);
184	(void)memcpy(buf, temp, 16);
185	buf[16] = cd9660_compute_gm_offset(tim);
186}
187
188/* Short dates: 7 characters */
189void
190cd9660_time_915(unsigned char *buf, time_t tim)
191{
192	struct tm t;
193
194	(void)localtime_r(&tim, &t);
195	buf[0] = t.tm_year;
196	buf[1] = t.tm_mon+1;
197	buf[2] = t.tm_mday;
198	buf[3] = t.tm_hour;
199	buf[4] = t.tm_min;
200	buf[5] = t.tm_sec;
201	buf[6] = cd9660_compute_gm_offset(tim);
202}
203