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 * $FreeBSD: head/usr.sbin/makefs/cd9660/cd9660_conversion.c 326276 2017-11-27 15:37:16Z pfg $
37 */
38 #include "cd9660.h"
39
40 static char cd9660_compute_gm_offset(time_t);
41
42 #if 0
43 static inline int
44 cd9660_pad_even(length)
45 int length;
46 {
47 return length + (length & 0x01);
48 }
49 #endif
50
51 /*
52 * These can probably be implemented using a macro
53 */
54
55 /* Little endian */
56 void
cd9660_721(uint16_t w,unsigned char * twochar)57 cd9660_721(uint16_t w, unsigned char *twochar)
58 {
59 #if BYTE_ORDER == BIG_ENDIAN
60 w = bswap16(w);
61 #endif
62 memcpy(twochar,&w,2);
63 }
64
65 void
cd9660_731(uint32_t w,unsigned char * fourchar)66 cd9660_731(uint32_t w, unsigned char *fourchar)
67 {
68 #if BYTE_ORDER == BIG_ENDIAN
69 w = bswap32(w);
70 #endif
71 memcpy(fourchar,&w,4);
72 }
73
74 /* Big endian */
75 void
cd9660_722(uint16_t w,unsigned char * twochar)76 cd9660_722(uint16_t w, unsigned char *twochar)
77 {
78 #if BYTE_ORDER == LITTLE_ENDIAN
79 w = bswap16(w);
80 #endif
81 memcpy(twochar,&w,2);
82 }
83
84 void
cd9660_732(uint32_t w,unsigned char * fourchar)85 cd9660_732(uint32_t w, unsigned char *fourchar)
86 {
87 #if BYTE_ORDER == LITTLE_ENDIAN
88 w = bswap32(w);
89 #endif
90 memcpy(fourchar,&w,4);
91 }
92
93 /**
94 * Convert a dword into a double endian string of eight characters
95 * @param int The double word to convert
96 * @param char* The string to write the both endian double word to - It is assumed this is allocated and at least
97 * eight characters long
98 */
99 void
cd9660_bothendian_dword(uint32_t dw,unsigned char * eightchar)100 cd9660_bothendian_dword(uint32_t dw, unsigned char *eightchar)
101 {
102 uint32_t le, be;
103 #if BYTE_ORDER == LITTLE_ENDIAN
104 le = dw;
105 be = bswap32(dw);
106 #endif
107 #if BYTE_ORDER == BIG_ENDIAN
108 be = dw;
109 le = bswap32(dw);
110 #endif
111 memcpy(eightchar, &le, 4);
112 memcpy((eightchar+4), &be, 4);
113 }
114
115 /**
116 * Convert a word into a double endian string of four characters
117 * @param int The word to convert
118 * @param char* The string to write the both endian word to - It is assumed this is allocated and at least
119 * four characters long
120 */
121 void
cd9660_bothendian_word(uint16_t dw,unsigned char * fourchar)122 cd9660_bothendian_word(uint16_t dw, unsigned char *fourchar)
123 {
124 uint16_t le, be;
125 #if BYTE_ORDER == LITTLE_ENDIAN
126 le = dw;
127 be = bswap16(dw);
128 #endif
129 #if BYTE_ORDER == BIG_ENDIAN
130 be = dw;
131 le = bswap16(dw);
132 #endif
133 memcpy(fourchar, &le, 2);
134 memcpy((fourchar+2), &be, 2);
135 }
136
137 void
cd9660_pad_string_spaces(char * str,int len)138 cd9660_pad_string_spaces(char *str, int len)
139 {
140 int i;
141
142 for (i = 0; i < len; i ++) {
143 if (str[i] == '\0')
144 str[i] = 0x20;
145 }
146 }
147
148 static char
cd9660_compute_gm_offset(time_t tim)149 cd9660_compute_gm_offset(time_t tim)
150 {
151 struct tm t, gm;
152
153 (void)localtime_r(&tim, &t);
154 (void)gmtime_r(&tim, &gm);
155 gm.tm_year -= t.tm_year;
156 gm.tm_yday -= t.tm_yday;
157 gm.tm_hour -= t.tm_hour;
158 gm.tm_min -= t.tm_min;
159 if (gm.tm_year < 0)
160 gm.tm_yday = -1;
161 else if (gm.tm_year > 0)
162 gm.tm_yday = 1;
163
164 return (char)(-(gm.tm_min + 60* (24 * gm.tm_yday + gm.tm_hour)) / 15);
165 }
166
167 /* Long dates: 17 characters */
168 void
cd9660_time_8426(unsigned char * buf,time_t tim)169 cd9660_time_8426(unsigned char *buf, time_t tim)
170 {
171 struct tm t;
172 char temp[18];
173
174 (void)localtime_r(&tim, &t);
175 (void)snprintf(temp, sizeof(temp), "%04i%02i%02i%02i%02i%02i%02i",
176 1900+(int)t.tm_year,
177 (int)t.tm_mon+1,
178 (int)t.tm_mday,
179 (int)t.tm_hour,
180 (int)t.tm_min,
181 (int)t.tm_sec,
182 0);
183 (void)memcpy(buf, temp, 16);
184 buf[16] = cd9660_compute_gm_offset(tim);
185 }
186
187 /* Short dates: 7 characters */
188 void
cd9660_time_915(unsigned char * buf,time_t tim)189 cd9660_time_915(unsigned char *buf, time_t tim)
190 {
191 struct tm t;
192
193 (void)localtime_r(&tim, &t);
194 buf[0] = t.tm_year;
195 buf[1] = t.tm_mon+1;
196 buf[2] = t.tm_mday;
197 buf[3] = t.tm_hour;
198 buf[4] = t.tm_min;
199 buf[5] = t.tm_sec;
200 buf[6] = cd9660_compute_gm_offset(tim);
201 }
202