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. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      @(#)cd9660_util.c       8.3 (Berkeley) 12/5/94
  40  * $FreeBSD: src/sys/isofs/cd9660/cd9660_util.c,v 1.13.2.1 2001/02/27 12:36:34 sobomax Exp $
  41  * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_util.c,v 1.4 2004/04/12 23:18:55 cpressey Exp $
  42  */
  43
  44 #include <sys/param.h>
  45 #include <sys/mount.h>
  46 #include <sys/vnode.h>
  47 #include <sys/iconv.h>
  48
  49 #include "iso.h"
  50 #include "cd9660_mount.h"
  51
  52 extern 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  */
  59 int
  60 isochar(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       *c = *isofn++;
  72       if (clen) *clen = 1;
  73       if (joliet_level == 0 || isofn == isoend)
  74               /* (00) and (01) are one byte in Joliet, too */
  75               return 1;
  76       if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
  77               i = j = len = 2;
  78               inbuf[0]=(char)*(isofn - 1);
  79               inbuf[1]=(char)*isofn;
  80               inbuf[2]='\0';
  81               inp = inbuf;
  82               outp = outbuf;
  83               cd9660_iconv->convchr(handle, (const char **)&inp, &i, &outp, &j);
  84               len -= j;
  85               if (clen) *clen = len;
  86               *c = '\0';
  87               while(len--)
  88                       *c |= (*(outp - len - 1) & 0xff) << (len << 3);
  89       } else {
  90               switch (*c) {
  91               default:
  92                       *c = '?';
  93                       break;
  94               case '\0':
  95                       *c = *isofn;
  96                       break;
  97               }
  98       }
  99       return 2;
 100 }
 101
 102 /*
 103  * translate and compare a filename
 104  * returns (fn - isofn)
 105  * Note: Version number plus ';' may be omitted.
 106  */
 107 int
 108 isofncmp(fn, fnlen, isofn, isolen, joliet_level, flags, handle, lhandle)
 109         u_char *fn;
 110         int fnlen;
 111         u_char *isofn;
 112         int isolen;
 113         int joliet_level;
 114         int flags;
 115         void *handle;
 116         void *lhandle;
 117 {
 118         int i, j;
 119         u_short c, d;
 120         u_char *fnend = fn + fnlen, *isoend = isofn + isolen;
 121         for (; fn < fnend; ) {
 122                 d = sgetrune(fn, fnend - fn, (char const **)&fn, flags, lhandle)
 123 ;
 124                 if (isofn == isoend)
 125                         return d;
 126                 isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
 127                 if (c == ';') {
 128                         if (d != ';')
 129                                 return d;
 130                         for (i = 0; fn < fnend; i = i * 10 + *fn++ - '0') {
 131                                 if (*fn < '0' || *fn > '9') {
 132                                         return -1;
 133                                 }
 134                         }
 135                         for (j = 0; isofn != isoend; j = j * 10 + c - '0')
 136                                 isofn += isochar(isofn, isoend,
 137                                                  joliet_level, &c,
 138                                                  NULL, flags, handle);
 139                         return i - j;
 140                 }
 141                 if (c != d) {
 142                         if (c >= 'A' && c <= 'Z') {
 143                                 if (c + ('a' - 'A') != d) {
 144                                         if (d >= 'a' && d <= 'z')
 145                                                 return d - ('a' - 'A') - c;
 146                                   else
 147                                                 return d - c;
 148                                 }
 149                         } else
 150                                 return d - c;
 151                 }
 152         }
 153         if (isofn != isoend) {
 154                 isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
 155                 switch (c) {
 156                 default:
 157                         return -c;
 158                 case '.':
 159                         if (isofn != isoend) {
 160                                 isochar(isofn, isoend, joliet_level, &c,
 161                                         NULL, flags, handle);
 162                                 if (c == ';')
 163                                         return 0;
 164                         }
 165                         return -1;
 166                 case ';':
 167  return 0;
 168                 }
 169         }
 170         return 0;
 171 }
 172
 173 /*
 174  * translate a filename of length > 0
 175  */
 176 isofntrans(infn, infnlen, outfn, outfnlen, original, assoc, joliet_level, flags,
 177  handle)
 178         u_char *infn;
 179         int infnlen;
 180         u_char *outfn;
 181         u_short *outfnlen;
 182         int original;
 183         int assoc;
 184         int joliet_level;
 185         int flags;
 186         void *handle;
 187 {
 188         u_short c, d = '\0';
 189         u_char *outp = outfn, *infnend = infn + infnlen;
 190         int clen;
 191         if (assoc) {
 192                 *outp++ = ASSOCCHAR;
 193         }
 194         for (; infn != infnend; ) {
 195                 infn += isochar(infn, infnend, joliet_level, &c, &clen, flags, handle);
 196                 if (!original && !joliet_level && c >= 'A' && c <= 'Z')
 197         c += ('a' - 'A');
 198                 else if (!original && c == ';') {
 199                         outp -= (d == '.');
 200                         break;
 201                 }
 202                 d = c;
 203                 while(clen--)
 204                         *outp++ = c >> (clen << 3);
 205         }
 206         *outfnlen = outp - outfn;
 207 }
 208
 209 /*
 210  * same as sgetrune(3)
 211  */
 212 u_short
 213 sgetrune(string, n, result, flags, handle)
 214         const char *string;
 215         size_t n;
 216         char const **result;
 217         int flags;
 218         void *handle;
 219 {
 220         size_t i, j, len;
 221         char outbuf[3], *outp;
 222         u_short c = '\0';
 223         len = i = (n < 2) ? n : 2;
 224         j = 2;
 225         outp = outbuf;
 226         if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
 227                 cd9660_iconv->convchr(handle, (const char **)&string,
 228                         &i, &outp, &j);
 229                 len -= i;
 230         } else {
 231                 len = 1;
 232                 string++;
 233         }
 234         if (result) *result = string;
 235         while(len--) c |= (*(string - len - 1) & 0xff) << (len << 3);
 236         return (c);
 237 }