1/* $NetBSD: cd9660_conversion.c,v 1.6 2024/06/17 13:31:17 reinoud Exp $ */
2
3/*
4 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan
5 * Perez-Rathke and Ram Vedam. All rights reserved.
6 *
7 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys,
8 * Alan Perez-Rathke and Ram Vedam.
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer in the documentation and/or other materials provided
18 * with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN
21 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN
25 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
28 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
29 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
32 * OF SUCH DAMAGE.
33 */
34#include "cd9660.h"
35
36#include <sys/cdefs.h>
37#if defined(__RCSID) && !defined(__lint)
38__RCSID("$NetBSD: cd9660_conversion.c,v 1.6 2024/06/17 13:31:17 reinoud Exp $");
39#endif /* !__lint */
40
41
42static char cd9660_compute_gm_offset(time_t);
43
44#if 0
45static inline int
46cd9660_pad_even(length)
47int length;
48{
49 return length + (length & 0x01);
50}
51#endif
52
53/*
54* These can probably be implemented using a macro
55*/
56
57/* Little endian */
58void
59cd9660_721(uint16_t w, unsigned char *twochar)
60{
61#if BYTE_ORDER == BIG_ENDIAN
62 w = bswap16(w);
63#endif
64 memcpy(twochar,&w,2);
65}
66
67void
68cd9660_731(uint32_t w, unsigned char *fourchar)
69{
70#if BYTE_ORDER == BIG_ENDIAN
71 w = bswap32(w);
72#endif
73 memcpy(fourchar,&w,4);
74}
75
76/* Big endian */
77void
78cd9660_722(uint16_t w, unsigned char *twochar)
79{
80#if BYTE_ORDER == LITTLE_ENDIAN
81 w = bswap16(w);
82#endif
83 memcpy(twochar,&w,2);
84}
85
86void
87cd9660_732(uint32_t w, unsigned char *fourchar)
88{
89#if BYTE_ORDER == LITTLE_ENDIAN
90 w = bswap32(w);
91#endif
92 memcpy(fourchar,&w,4);
93}
94
95/**
96* Convert a dword into a double endian string of eight characters
97* @param int The double word to convert
98* @param char* The string to write the both endian double word to - It is assumed this is allocated and at least
99* eight characters long
100*/
101void
102cd9660_bothendian_dword(uint32_t dw, unsigned char *eightchar)
103{
104 uint32_t le, be;
105#if BYTE_ORDER == LITTLE_ENDIAN
106 le = dw;
107 be = bswap32(dw);
108#endif
109#if BYTE_ORDER == BIG_ENDIAN
110 be = dw;
111 le = bswap32(dw);
112#endif
113 memcpy(eightchar, &le, 4);
114 memcpy((eightchar+4), &be, 4);
115}
116
117/**
118* Convert a word into a double endian string of four characters
119* @param int The word to convert
120* @param char* The string to write the both endian word to - It is assumed this is allocated and at least
121* four characters long
122*/
123void
124cd9660_bothendian_word(uint16_t dw, unsigned char *fourchar)
125{
126 uint16_t le, be;
127#if BYTE_ORDER == LITTLE_ENDIAN
128 le = dw;
129 be = bswap16(dw);
130#endif
131#if BYTE_ORDER == BIG_ENDIAN
132 be = dw;
133 le = bswap16(dw);
134#endif
135 memcpy(fourchar, &le, 2);
136 memcpy((fourchar+2), &be, 2);
137}
138
139void
140cd9660_pad_string_spaces(char *str, int len)
141{
142 int i;
143
144 for (i = 0; i < len; i ++) {
145 if (str[i] == '\0')
146 str[i] = 0x20;
147 }
148}
149
150static char
151cd9660_compute_gm_offset(time_t tim)
152{
153 if (stampst.st_ino)
154 return 0;
155
156 struct tm t, gm;
157
158 (void)localtime_r(&tim, &t);
159 (void)gmtime_r(&tim, &gm);
160 gm.tm_year -= t.tm_year;
161 gm.tm_yday -= t.tm_yday;
162 gm.tm_hour -= t.tm_hour;
163 gm.tm_min -= t.tm_min;
164 if (gm.tm_year < 0)
165 gm.tm_yday = -1;
166 else if (gm.tm_year > 0)
167 gm.tm_yday = 1;
168
169 return (char)(-(gm.tm_min + 60* (24 * gm.tm_yday + gm.tm_hour)) / 15);
170}
171
172/* Long dates: 17 characters */
173void
174cd9660_time_8426(unsigned char *buf, time_t tim)
175{
176 struct tm t;
177 char temp[70]; /* we know its only 18 but gcc can't figure this out */
178
179 if (stampst.st_ino)
180 (void)gmtime_r(&tim, &t);
181 else
182 (void)localtime_r(&tim, &t);
183 (void)snprintf(temp, sizeof(temp), "%04i%02i%02i%02i%02i%02i%02i",
184 1900+(int)t.tm_year,
185 (int)t.tm_mon+1,
186 (int)t.tm_mday,
187 (int)t.tm_hour,
188 (int)t.tm_min,
189 (int)t.tm_sec,
190 0);
191 (void)memcpy(buf, temp, 16);
192 buf[16] = cd9660_compute_gm_offset(tim);
193}
194
195/* Short dates: 7 characters */
196void
197cd9660_time_915(unsigned char *buf, time_t tim)
198{
199 struct tm t;
200
201 if (stampst.st_ino)
202 (void)gmtime_r(&tim, &t);
203 else
204 (void)localtime_r(&tim, &t);
205 buf[0] = t.tm_year;
206 buf[1] = t.tm_mon+1;
207 buf[2] = t.tm_mday;
208 buf[3] = t.tm_hour;
209 buf[4] = t.tm_min;
210 buf[5] = t.tm_sec;
211 buf[6] = cd9660_compute_gm_offset(tim);
212}
