The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/cd9660/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(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  */
  111 int
  112 isofncmp(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++ - '') {
  136                                 if (*fn < '' || *fn > '9') {
  137                                         return -1;
  138                                 }
  139                         }
  140                         for (j = 0; isofn != isoend; j = j * 10 + c - '')
  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  */
  181 void
  182 isofntrans(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  */
  219 u_short
  220 sgetrune(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 }

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