cd9660_util.c

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    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  *      @(#)cd9660_util.c       8.3 (Berkeley) 12/5/94
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   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 
   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(u_char *isofn, u_char *isoend, int joliet_level, u_short *c, int *clen,
   61     int flags, void *handle)
   62 {
   63       size_t i, j, len;
   64       char inbuf[3], outbuf[3], *inp, *outp;
   65 
   66       *c = *isofn++;
   67       if (clen) *clen = 1;
   68       if (joliet_level == 0 || isofn == isoend)
   69               /* (00) and (01) are one byte in Joliet, too */
   70               return 1;
   71 
   72       if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
   73               i = j = len = 2;
   74               inbuf[0]=(char)*(isofn - 1);
   75               inbuf[1]=(char)*isofn;
   76               inbuf[2]='\0';
   77               inp = inbuf;
   78               outp = outbuf;
   79               cd9660_iconv->convchr(handle, __DECONST(const char **, &inp), &i,
   80                   &outp, &j);
   81               len -= j;
   82               if (clen) *clen = len;
   83               *c = '\0';
   84               while(len--)
   85                       *c |= (*(outp - len - 1) & 0xff) << (len << 3);
   86       } else {
   87               switch (*c) {
   88               default:
   89                       *c = '?';
   90                       break;
   91               case '\0':
   92                       *c = *isofn;
   93                       break;
   94               }
   95       }
   96 
   97       return 2;
   98 }
   99 
  100 /*
  101  * translate and compare a filename
  102  * returns (fn - isofn)
  103  * Note: Version number plus ';' may be omitted.
  104  */
  105 int
  106 isofncmp(u_char *fn, int fnlen, u_char *isofn, int isolen, int joliet_level,
  107     int flags, void *handle, void *lhandle)
  108 {
  109         int i, j;
  110         u_short c, d;
  111         u_char *fnend = fn + fnlen, *isoend = isofn + isolen;
  112 
  113         for (; fn < fnend; ) {
  114                 d = sgetrune(fn, fnend - fn, __DECONST(const char **, &fn),
  115                     flags, lhandle);
  116                 if (isofn == isoend)
  117                         return d;
  118                 isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
  119                 if (c == ';') {
  120                         if (d != ';')
  121                                 return d;
  122                         for (i = 0; fn < fnend; i = i * 10 + *fn++ - '') {
  123                                 if (*fn < '' || *fn > '9') {
  124                                         return -1;
  125                                 }
  126                         }
  127                         for (j = 0; isofn != isoend; j = j * 10 + c - '')
  128                                 isofn += isochar(isofn, isoend,
  129                                                  joliet_level, &c,
  130                                                  NULL, flags, handle);
  131                         return i - j;
  132                 }
  133                 if (c != d) {
  134                         if (c >= 'A' && c <= 'Z') {
  135                                 if (c + ('a' - 'A') != d) {
  136                                         if (d >= 'a' && d <= 'z')
  137                                                 return d - ('a' - 'A') - c;
  138                                         else
  139                                                 return d - c;
  140                                 }
  141                         } else
  142                                 return d - c;
  143                 }
  144         }
  145         if (isofn != isoend) {
  146                 isofn += isochar(isofn, isoend, joliet_level, &c, NULL, flags, handle);
  147                 switch (c) {
  148                 default:
  149                         return -c;
  150                 case '.':
  151                         if (isofn != isoend) {
  152                                 isochar(isofn, isoend, joliet_level, &c,
  153                                         NULL, flags, handle);
  154                                 if (c == ';')
  155                                         return 0;
  156                         }
  157                         return -1;
  158                 case ';':
  159                         return 0;
  160                 }
  161         }
  162         return 0;
  163 }
  164 
  165 /*
  166  * translate a filename of length > 0
  167  */
  168 void
  169 isofntrans(u_char *infn, int infnlen, u_char *outfn, u_short *outfnlen,
  170     int original, int assoc, int joliet_level, int flags, void *handle)
  171 {
  172         u_short c, d = '\0';
  173         u_char *outp = outfn, *infnend = infn + infnlen;
  174         int clen;
  175 
  176         if (assoc) {
  177                 *outp++ = ASSOCCHAR;
  178         }
  179         for (; infn != infnend; ) {
  180                 infn += isochar(infn, infnend, joliet_level, &c, &clen, flags, handle);
  181 
  182                 if (!original && !joliet_level && c >= 'A' && c <= 'Z')
  183                         c += ('a' - 'A');
  184                 else if (!original && c == ';') {
  185                         outp -= (d == '.');
  186                         break;
  187                 }
  188                 d = c;
  189                 while(clen--)
  190                         *outp++ = c >> (clen << 3);
  191         }
  192         *outfnlen = outp - outfn;
  193 }
  194 
  195 /*
  196  * same as sgetrune(3)
  197  */
  198 u_short
  199 sgetrune(const char *string, size_t n, char const **result, int flags,
  200     void *handle)
  201 {
  202         size_t i, j, len;
  203         char outbuf[3], *outp;
  204         u_short c = '\0';
  205 
  206         len = i = (n < 2) ? n : 2;
  207         j = 2;
  208         outp = outbuf;
  209 
  210         if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
  211                 cd9660_iconv->convchr(handle, (const char **)&string,
  212                         &i, &outp, &j);
  213                 len -= i;
  214         } else {
  215                 len = 1;
  216                 string++;
  217         }
  218 
  219         if (result) *result = string;
  220         while(len--) c |= (*(string - len - 1) & 0xff) << (len << 3);
  221         return (c);
  222 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/cd9660/cd9660_util.c

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sys/fs/cd9660/cd9660_util.c