1 /* $OpenBSD: cd9660_conversion.c,v 1.2 2016/10/16 20:26:56 natano Exp $ */
2 /* $NetBSD: cd9660_conversion.c,v 1.4 2007/03/14 14:11:17 christos Exp $ */
3
4 /*
5 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan
6 * Perez-Rathke and Ram Vedam. All rights reserved.
7 *
8 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys,
9 * Alan Perez-Rathke and Ram Vedam.
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer in the documentation and/or other materials provided
19 * with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN
22 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN
26 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
29 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
30 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
33 * OF SUCH DAMAGE.
34 */
35 #include "cd9660.h"
36
37 #define bswap16 swap16
38 #define bswap32 swap32
39
40
41 static char cd9660_compute_gm_offset(time_t);
42
43 #if 0
44 static inline int
45 cd9660_pad_even(length)
46 int 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 */
57 void
cd9660_721(uint16_t w,unsigned char * twochar)58 cd9660_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
66 void
cd9660_731(uint32_t w,unsigned char * fourchar)67 cd9660_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 */
76 void
cd9660_722(uint16_t w,unsigned char * twochar)77 cd9660_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
85 void
cd9660_732(uint32_t w,unsigned char * fourchar)86 cd9660_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 */
100 void
cd9660_bothendian_dword(uint32_t dw,unsigned char * eightchar)101 cd9660_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 */
122 void
cd9660_bothendian_word(uint16_t dw,unsigned char * fourchar)123 cd9660_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
138 void
cd9660_pad_string_spaces(char * str,int len)139 cd9660_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
149 static char
cd9660_compute_gm_offset(time_t tim)150 cd9660_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 */
169 void
cd9660_time_8426(unsigned char * buf,time_t tim)170 cd9660_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 */
189 void
cd9660_time_915(unsigned char * buf,time_t tim)190 cd9660_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