xref: /freebsd/sys/fs/cd9660/cd9660_util.c (revision 7c43148a974877188a930e4078a164f83da8e652)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1994
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley
8  * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
9  * Support code is derived from software contributed to Berkeley
10  * by Atsushi Murai (amurai@spec.co.jp). Joliet support was added by
11  * Joachim Kuebart (joki@kuebart.stuttgart.netsurf.de).
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  * 3. Neither the name of the University nor the names of its contributors
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 
38 #include <sys/cdefs.h>
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/mount.h>
42 #include <sys/vnode.h>
43 #include <sys/iconv.h>
44 
45 #include <fs/cd9660/iso.h>
46 #include <fs/cd9660/cd9660_mount.h>
47 
48 extern struct iconv_functions *cd9660_iconv;
49 
50 /*
51  * Get one character out of an iso filename
52  * Obey joliet_level
53  * Return number of bytes consumed
54  */
55 int
56 isochar(u_char *isofn, u_char *isoend, int joliet_level, u_short *c, int *clen,
57     int flags, void *handle)
58 {
59       size_t i, j, len;
60       char inbuf[3], outbuf[3], *inp, *outp;
61 
62       *c = *isofn++;
63       if (clen) *clen = 1;
64       if (joliet_level == 0 || isofn == isoend)
65               /* (00) and (01) are one byte in Joliet, too */
66               return 1;
67 
68       if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
69               i = j = len = 2;
70               inbuf[0]=(char)*(isofn - 1);
71               inbuf[1]=(char)*isofn;
72               inbuf[2]='\0';
73               inp = inbuf;
74               outp = outbuf;
75               cd9660_iconv->convchr(handle, __DECONST(const char **, &inp), &i,
76                   &outp, &j);
77               len -= j;
78               if (clen) *clen = len;
79               *c = '\0';
80               while(len--)
81                       *c |= (*(outp - len - 1) & 0xff) << (len << 3);
82       } else {
83               switch (*c) {
84               default:
85                       *c = '?';
86                       break;
87               case '\0':
88                       *c = *isofn;
89                       break;
90               }
91       }
92 
93       return 2;
94 }
95 
96 /*
97  * translate and compare a filename
98  * returns (fn - isofn)
99  * Note: Version number plus ';' may be omitted.
100  */
101 int
102 isofncmp(u_char *fn, int fnlen, u_char *isofn, int isolen, int joliet_level,
103     int flags, void *handle, void *lhandle)
104 {
105 	int i, j;
106 	u_short c, d;
107 	u_char *fnend = fn + fnlen, *isoend = isofn + isolen;
108 
109 	for (; fn < fnend; ) {
110 		d = sgetrune(fn, fnend - fn, __DECONST(const char **, &fn),
111 		    flags, lhandle);
112 		if (isofn == isoend)
113 			return d;
114 		isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
115 		if (c == ';') {
116 			if (d != ';')
117 				return d;
118 			for (i = 0; fn < fnend; i = i * 10 + *fn++ - '0') {
119 				if (*fn < '0' || *fn > '9') {
120 					return -1;
121 				}
122 			}
123 			for (j = 0; isofn != isoend; j = j * 10 + c - '0')
124 				isofn += isochar(isofn, isoend,
125 						 joliet_level, &c,
126 						 NULL, flags, handle);
127 			return i - j;
128 		}
129 		if (c != d) {
130 			if (c >= 'A' && c <= 'Z') {
131 				if (c + ('a' - 'A') != d) {
132 					if (d >= 'a' && d <= 'z')
133 						return d - ('a' - 'A') - c;
134 					else
135 						return d - c;
136 				}
137 			} else
138 				return d - c;
139 		}
140 	}
141 	if (isofn != isoend) {
142 		isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
143 		switch (c) {
144 		default:
145 			return -c;
146 		case '.':
147 			if (isofn != isoend) {
148 				isochar(isofn, isoend, joliet_level, &c,
149 					NULL, flags, handle);
150 				if (c == ';')
151 					return 0;
152 			}
153 			return -1;
154 		case ';':
155 			return 0;
156 		}
157 	}
158 	return 0;
159 }
160 
161 /*
162  * translate a filename of length > 0
163  */
164 void
165 isofntrans(u_char *infn, int infnlen, u_char *outfn, u_short *outfnlen,
166     int original, int assoc, int joliet_level, int flags, void *handle)
167 {
168 	u_short c, d = '\0';
169 	u_char *outp = outfn, *infnend = infn + infnlen;
170 	int clen;
171 
172 	if (assoc) {
173 		*outp++ = ASSOCCHAR;
174 	}
175 	for (; infn != infnend; ) {
176 		infn += isochar(infn, infnend, joliet_level, &c, &clen, flags, handle);
177 
178 		if (!original && !joliet_level && c >= 'A' && c <= 'Z')
179 			c += ('a' - 'A');
180 		else if (!original && c == ';') {
181 			outp -= (d == '.');
182 			break;
183 		}
184 		d = c;
185 		while(clen--)
186 			*outp++ = c >> (clen << 3);
187 	}
188 	*outfnlen = outp - outfn;
189 }
190 
191 /*
192  * same as sgetrune(3)
193  */
194 u_short
195 sgetrune(const char *string, size_t n, char const **result, int flags,
196     void *handle)
197 {
198 	size_t i, j, len;
199 	char outbuf[3], *outp;
200 	u_short c = '\0';
201 
202 	len = i = (n < 2) ? n : 2;
203 	j = 2;
204 	outp = outbuf;
205 
206 	if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
207 		cd9660_iconv->convchr(handle, (const char **)&string,
208 			&i, &outp, &j);
209 		len -= i;
210 	} else {
211 		len = 1;
212 		string++;
213 	}
214 
215 	if (result) *result = string;
216 	while(len--) c |= (*(string - len - 1) & 0xff) << (len << 3);
217 	return (c);
218 }
219