sys/vfs/isofs/cd9660/cd9660_util.c

   1 /*-
   2  * Copyright (c) 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley
   6  * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
   7  * Support code is derived from software contributed to Berkeley
   8  * by Atsushi Murai (amurai@spec.co.jp). Joliet support was added by
   9  * Joachim Kuebart (joki@kuebart.stuttgart.netsurf.de).
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * 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 copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)cd9660_util.c       8.3 (Berkeley) 12/5/94
  36  * $FreeBSD: src/sys/isofs/cd9660/cd9660_util.c,v 1.13.2.1 2001/02/27 12:36:34 sobomax Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/mount.h>
  41 #include <sys/vnode.h>
  42 #include <sys/iconv.h>
  43
  44 #include "iso.h"
  45 #include "cd9660_mount.h"
  46
  47 extern struct iconv_functions *cd9660_iconv;
  48
  49 /*
  50  * Get one character out of an iso filename
  51  * Obey joliet_level
  52  * Return number of bytes consumed
  53  */
  54 int
  55 isochar(u_char *isofn, u_char *isoend, int joliet_level, u_short *c,
  56         int *clen, int flags, void *handle)
  57 {
  58         size_t i, j, len;
  59         char inbuf[3], outbuf[3], *inp, *outp;
  60
  61         *c = *isofn++;
  62         if (clen) *clen = 1;
  63         if (joliet_level == 0 || isofn == isoend) {
  64                 /* (00) and (01) are one byte in Joliet, too */
  65                 return 1;
  66         }
  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, (const char **)(void *)&inp,
  76                     &i, &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, (char const **)&fn, flags, lhandle);
 111                 if (isofn == isoend)
 112                         return d;
 113                 isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
 114                 if (c == ';') {
 115                         if (d != ';')
 116                                 return d;
 117                         for (i = 0; fn < fnend; i = i * 10 + *fn++ - '0') {
 118                                 if (*fn < '0' || *fn > '9') {
 119                                         return -1;
 120                                 }
 121                         }
 122                         for (j = 0; isofn != isoend; j = j * 10 + c - '0')
 123                                 isofn += isochar(isofn, isoend,
 124                                                  joliet_level, &c,
 125                                                  NULL, flags, handle);
 126                         return i - j;
 127                 }
 128                 if (c != d) {
 129                         if (c >= 'A' && c <= 'Z') {
 130                                 if (c + ('a' - 'A') != d) {
 131                                         if (d >= 'a' && d <= 'z')
 132                                                 return d - ('a' - 'A') - c;
 133                                         else
 134                                                 return d - c;
 135                                 }
 136                         } else
 137                                 return d - c;
 138                 }
 139         }
 140         if (isofn != isoend) {
 141                 isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
 142                 switch (c) {
 143                 default:
 144                         return -c;
 145                 case '.':
 146                         if (isofn != isoend) {
 147                                 isochar(isofn, isoend, joliet_level, &c,
 148                                         NULL, flags, handle);
 149                                 if (c == ';')
 150                                         return 0;
 151                         }
 152                         return -1;
 153                 case ';':
 154                         return 0;
 155                 }
 156         }
 157         return 0;
 158 }
 159
 160 /*
 161  * translate a filename of length > 0
 162  */
 163 void
 164 isofntrans(u_char *infn, int infnlen, u_char *outfn, u_short *outfnlen, int original,
 165            int assoc, int joliet_level, int flags, void *handle)
 166 {
 167         u_short c, d = '\0';
 168         u_char *outp = outfn, *infnend = infn + infnlen;
 169         int clen;
 170
 171         if (assoc) {
 172                 *outp++ = ASSOCCHAR;
 173         }
 174         for (; infn != infnend; ) {
 175                 infn += isochar(infn, infnend, joliet_level, &c, &clen, flags, handle);
 176
 177                 if (!original && !joliet_level && c >= 'A' && c <= 'Z')
 178                         c += ('a' - 'A');
 179                 else if (!original && c == ';') {
 180                         outp -= (d == '.');
 181                         break;
 182                 }
 183                 d = c;
 184                 while(clen--)
 185                         *outp++ = c >> (clen << 3);
 186         }
 187         *outfnlen = outp - outfn;
 188 }
 189
 190 /*
 191  * same as sgetrune(3)
 192  */
 193 u_short
 194 sgetrune(const char *string, size_t n, char const **result,
 195          int flags, void *handle)
 196 {
 197         size_t i, j, len;
 198         char outbuf[3], *outp;
 199         u_short c = '\0';
 200
 201         len = i = (n < 2) ? n : 2;
 202         j = 2;
 203         outp = outbuf;
 204
 205         if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
 206                 cd9660_iconv->convchr(handle, &string, &i, &outp, &j);
 207                 len -= i;
 208         } else {
 209                 len = 1;
 210                 string++;
 211         }
 212
 213         if (result) *result = string;
 214         while(len--) c |= (*(string - len - 1) & 0xff) << (len << 3);
 215         return (c);
 216 }