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/isofs/cd9660/cd9660_util.c

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    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  */
   41 
   42 #include <sys/cdefs.h>
   43 __FBSDID("$FreeBSD: releng/5.2/sys/isofs/cd9660/cd9660_util.c 120492 2003-09-26 20:26:25Z fjoe $");
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/mount.h>
   48 #include <sys/vnode.h>
   49 #include <sys/iconv.h>
   50 
   51 #include <isofs/cd9660/iso.h>
   52 #include <isofs/cd9660/cd9660_mount.h>
   53 
   54 extern struct iconv_functions *cd9660_iconv;
   55 
   56 /*
   57  * Get one character out of an iso filename
   58  * Obey joliet_level
   59  * Return number of bytes consumed
   60  */
   61 int
   62 isochar(isofn, isoend, joliet_level, c, clen, flags, handle)
   63       u_char *isofn;
   64       u_char *isoend;
   65       int joliet_level;
   66       u_short *c;
   67       int *clen;
   68       int flags;
   69       void *handle;
   70 {
   71       size_t i, j, len;
   72       char inbuf[3], outbuf[3], *inp, *outp;
   73 
   74       *c = *isofn++;
   75       if (clen) *clen = 1;
   76       if (joliet_level == 0 || isofn == isoend)
   77               /* (00) and (01) are one byte in Joliet, too */
   78               return 1;
   79 
   80       if (flags & ISOFSMNT_KICONV && cd9660_iconv) {
   81               i = j = len = 2;
   82               inbuf[0]=(char)*(isofn - 1);
   83               inbuf[1]=(char)*isofn;
   84               inbuf[2]='\0';
   85               inp = inbuf;
   86               outp = outbuf;
   87               cd9660_iconv->convchr(handle, (const char **)&inp, &i, &outp, &j);
   88               len -= j;
   89               if (clen) *clen = len;
   90               *c = '\0';
   91               while(len--)
   92                       *c |= (*(outp - len - 1) & 0xff) << (len << 3);
   93       } else {
   94               switch (*c) {
   95               default:
   96                       *c = '?';
   97                       break;
   98               case '\0':
   99                       *c = *isofn;
  100                       break;
  101               }
  102       }
  103 
  104       return 2;
  105 }
  106 
  107 /*
  108  * translate and compare a filename
  109  * returns (fn - isofn)
  110  * Note: Version number plus ';' may be omitted.
  111  */
  112 int
  113 isofncmp(fn, fnlen, isofn, isolen, joliet_level, flags, handle, lhandle)
  114         u_char *fn;
  115         int fnlen;
  116         u_char *isofn;
  117         int isolen;
  118         int joliet_level;
  119         int flags;
  120         void *handle;
  121         void *lhandle;
  122 {
  123         int i, j;
  124         u_short c, d;
  125         u_char *fnend = fn + fnlen, *isoend = isofn + isolen;
  126 
  127         for (; fn < fnend; ) {
  128                 d = sgetrune(fn, fnend - fn, (char const **)&fn, 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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