cd9660_util.c revision 330897 
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 * 4. 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 *	@(#)cd9660_util.c	8.3 (Berkeley) 12/5/94
38 */
39
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD: stable/11/sys/fs/cd9660/cd9660_util.c 330897 2018-03-14 03:19:51Z eadler $");
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/mount.h>
46#include <sys/vnode.h>
47#include <sys/iconv.h>
48
49#include <fs/cd9660/iso.h>
50#include <fs/cd9660/cd9660_mount.h>
51
52extern struct iconv_functions *cd9660_iconv;
53
54/*
55 * Get one character out of an iso filename
56 * Obey joliet_level
57 * Return number of bytes consumed
58 */
59int
60isochar(isofn, isoend, joliet_level, c, clen, flags, handle)
61      u_char *isofn;
62      u_char *isoend;
63      int joliet_level;
64      u_short *c;
65      int *clen;
66      int flags;
67      void *handle;
68{
69      size_t i, j, len;
70      char inbuf[3], outbuf[3], *inp, *outp;
71
72      *c = *isofn++;
73      if (clen) *clen = 1;
74      if (joliet_level == 0 || isofn == isoend)
75              /* (00) and (01) are one byte in Joliet, too */
76              return 1;
77
78      if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
79              i = j = len = 2;
80              inbuf[0]=(char)*(isofn - 1);
81              inbuf[1]=(char)*isofn;
82              inbuf[2]='\0';
83              inp = inbuf;
84              outp = outbuf;
85              cd9660_iconv->convchr(handle, __DECONST(const char **, &inp), &i,
86                  &outp, &j);
87              len -= j;
88              if (clen) *clen = len;
89              *c = '\0';
90              while(len--)
91                      *c |= (*(outp - len - 1) & 0xff) << (len << 3);
92      } else {
93              switch (*c) {
94              default:
95                      *c = '?';
96                      break;
97              case '\0':
98                      *c = *isofn;
99                      break;
100              }
101      }
102
103      return 2;
104}
105
106/*
107 * translate and compare a filename
108 * returns (fn - isofn)
109 * Note: Version number plus ';' may be omitted.
110 */
111int
112isofncmp(fn, fnlen, isofn, isolen, joliet_level, flags, handle, lhandle)
113	u_char *fn;
114	int fnlen;
115	u_char *isofn;
116	int isolen;
117	int joliet_level;
118	int flags;
119	void *handle;
120	void *lhandle;
121{
122	int i, j;
123	u_short c, d;
124	u_char *fnend = fn + fnlen, *isoend = isofn + isolen;
125
126	for (; fn < fnend; ) {
127		d = sgetrune(fn, fnend - fn, __DECONST(const char **, &fn),
128		    flags, lhandle);
129		if (isofn == isoend)
130			return d;
131		isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
132		if (c == ';') {
133			if (d != ';')
134				return d;
135			for (i = 0; fn < fnend; i = i * 10 + *fn++ - '0') {
136				if (*fn < '0' || *fn > '9') {
137					return -1;
138				}
139			}
140			for (j = 0; isofn != isoend; j = j * 10 + c - '0')
141				isofn += isochar(isofn, isoend,
142						 joliet_level, &c,
143						 NULL, flags, handle);
144			return i - j;
145		}
146		if (c != d) {
147			if (c >= 'A' && c <= 'Z') {
148				if (c + ('a' - 'A') != d) {
149					if (d >= 'a' && d <= 'z')
150						return d - ('a' - 'A') - c;
151					else
152						return d - c;
153				}
154			} else
155				return d - c;
156		}
157	}
158	if (isofn != isoend) {
159		isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
160		switch (c) {
161		default:
162			return -c;
163		case '.':
164			if (isofn != isoend) {
165				isochar(isofn, isoend, joliet_level, &c,
166					NULL, flags, handle);
167				if (c == ';')
168					return 0;
169			}
170			return -1;
171		case ';':
172			return 0;
173		}
174	}
175	return 0;
176}
177
178/*
179 * translate a filename of length > 0
180 */
181void
182isofntrans(infn, infnlen, outfn, outfnlen, original, assoc, joliet_level, flags, handle)
183	u_char *infn;
184	int infnlen;
185	u_char *outfn;
186	u_short *outfnlen;
187	int original;
188	int assoc;
189	int joliet_level;
190	int flags;
191	void *handle;
192{
193	u_short c, d = '\0';
194	u_char *outp = outfn, *infnend = infn + infnlen;
195	int clen;
196
197	if (assoc) {
198		*outp++ = ASSOCCHAR;
199	}
200	for (; infn != infnend; ) {
201		infn += isochar(infn, infnend, joliet_level, &c, &clen, flags, handle);
202
203		if (!original && !joliet_level && c >= 'A' && c <= 'Z')
204			c += ('a' - 'A');
205		else if (!original && c == ';') {
206			outp -= (d == '.');
207			break;
208		}
209		d = c;
210		while(clen--)
211			*outp++ = c >> (clen << 3);
212	}
213	*outfnlen = outp - outfn;
214}
215
216/*
217 * same as sgetrune(3)
218 */
219u_short
220sgetrune(string, n, result, flags, handle)
221	const char *string;
222	size_t n;
223	char const **result;
224	int flags;
225	void *handle;
226{
227	size_t i, j, len;
228	char outbuf[3], *outp;
229	u_short c = '\0';
230
231	len = i = (n < 2) ? n : 2;
232	j = 2;
233	outp = outbuf;
234
235	if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
236		cd9660_iconv->convchr(handle, (const char **)&string,
237			&i, &outp, &j);
238		len -= i;
239	} else {
240		len = 1;
241		string++;
242	}
243
244	if (result) *result = string;
245	while(len--) c |= (*(string - len - 1) & 0xff) << (len << 3);
246	return (c);
247}
248