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