sys/fs/cd9660/cd9660_util.c

   1 /*      $NetBSD: cd9660_util.c,v 1.8 2006/12/08 22:04:56 enami Exp $    */
   2
   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).
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)cd9660_util.c       8.3 (Berkeley) 12/5/94
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __KERNEL_RCSID(0, "$NetBSD: cd9660_util.c,v 1.8 2006/12/08 22:04:56 enami Exp $");
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/namei.h>
  45 #include <sys/resourcevar.h>
  46 #include <sys/kernel.h>
  47 #include <sys/file.h>
  48 #include <sys/stat.h>
  49 #include <sys/buf.h>
  50 #include <sys/proc.h>
  51 #include <sys/mount.h>
  52 #include <sys/vnode.h>
  53 #include <sys/malloc.h>
  54 #include <sys/dirent.h>
  55
  56 #include <fs/cd9660/iso.h>
  57 #include <fs/cd9660/cd9660_extern.h>
  58
  59 #include <fs/unicode.h>
  60
  61 static u_int16_t wget(const u_char **, size_t *, int);
  62 static int wput(u_char *, size_t, u_int16_t, int);
  63
  64 int cd9660_utf8_joliet = 1;
  65
  66 /*
  67  * Get one character out of an iso filename
  68  * Return number of bytes consumed
  69  */
  70 int
  71 isochar(const u_char *isofn, const u_char *isoend, int joliet_level,
  72         u_int16_t *c)
  73 {
  74         *c = isofn[0];
  75         if (joliet_level == 0 || isofn + 1 == isoend) {
  76                 /* (00) and (01) are one byte in Joliet, too */
  77                 return 1;
  78         }
  79
  80         if (cd9660_utf8_joliet) {
  81                 *c = (*c << 8) + isofn[1];
  82         } else {
  83                 /* characters outside ISO-8859-1 subset replaced with '?' */
  84                 if (*c != 0)
  85                         *c = '?';
  86                 else
  87                         *c = isofn[1];
  88         }
  89
  90         return 2;
  91 }
  92
  93 /*
  94  * translate and compare a filename
  95  * Note: Version number plus ';' may be omitted.
  96  */
  97 int
  98 isofncmp(const u_char *fn, size_t fnlen, const u_char *isofn, size_t isolen,
  99         int joliet_level)
 100 {
 101         int i, j;
 102         u_int16_t fc, ic;
 103         const u_char *isoend = isofn + isolen;
 104
 105         while (fnlen > 0) {
 106                 fc = wget(&fn, &fnlen, joliet_level);
 107
 108                 if (isofn == isoend)
 109                         return fc;
 110                 isofn += isochar(isofn, isoend, joliet_level, &ic);
 111                 if (ic == ';') {
 112                         switch (fc) {
 113                         default:
 114                                 return fc;
 115                         case 0:
 116                                 return 0;
 117                         case ';':
 118                                 break;
 119                         }
 120                         fn++;
 121                         for (i = 0; fnlen-- != 0; i = i * 10 + *fn++ - '0') {
 122                                 if (*fn < '0' || *fn > '9') {
 123                                         return -1;
 124                                 }
 125                         }
 126                         for (j = 0; isofn != isoend; j = j * 10 + ic - '0')
 127                                 isofn += isochar(isofn, isoend,
 128                                                  joliet_level, &ic);
 129                         return i - j;
 130                 }
 131                 if (ic != fc) {
 132                         if (ic >= 'A' && ic <= 'Z') {
 133                                 if (ic + ('a' - 'A') != fc) {
 134                                         if (fc >= 'a' && fc <= 'z')
 135                                                 fc -= 'a' - 'A';
 136
 137                                         return (int) fc - (int) ic;
 138                                 }
 139                         } else
 140                                 return (int) fc - (int) ic;
 141                 }
 142         }
 143         if (isofn != isoend) {
 144                 isofn += isochar(isofn, isoend, joliet_level, &ic);
 145                 switch (ic) {
 146                 default:
 147                         return -1;
 148                 case '.':
 149                         if (isofn != isoend) {
 150                                 isochar(isofn, isoend, joliet_level, &ic);
 151                                 if (ic == ';')
 152                                         return 0;
 153                         }
 154                         return -1;
 155                 case ';':
 156                         return 0;
 157                 }
 158         }
 159         return 0;
 160 }
 161
 162 /*
 163  * translate a filename
 164  */
 165 void
 166 isofntrans(const u_char *infn, int infnlen, u_char *outfn, u_short *outfnlen,
 167         int original, int casetrans, int assoc, int joliet_level)
 168 {
 169         int fnidx = 0;
 170         const u_char *infnend = infn + infnlen;
 171         u_int16_t c;
 172         int sz;
 173
 174         if (assoc) {
 175                 *outfn++ = ASSOCCHAR;
 176                 fnidx++;
 177         }
 178
 179         for(; infn != infnend; fnidx += sz) {
 180                 infn += isochar(infn, infnend, joliet_level, &c);
 181
 182                 if (casetrans && joliet_level == 0 && c >= 'A' && c <= 'Z')
 183                         c = c + ('a' - 'A');
 184                 else if (!original && c == ';') {
 185                         if (fnidx > 0 && outfn[-1] == '.')
 186                                 fnidx--;
 187                         break;
 188                 }
 189
 190                 sz = wput(outfn, MAXNAMLEN - fnidx, c, joliet_level);
 191                 if (sz == 0) {
 192                         /* not enough space to write the character */
 193                         if (fnidx < MAXNAMLEN) {
 194                                 *outfn = '?';
 195                                 fnidx++;
 196                         }
 197                         break;
 198                 }
 199                 outfn += sz;
 200         }
 201         *outfnlen = fnidx;
 202 }
 203
 204 static u_int16_t
 205 wget(const u_char **str, size_t *sz, int joliet_level)
 206 {
 207         if (joliet_level > 0 && cd9660_utf8_joliet) {
 208                 /* decode UTF-8 sequence */
 209                 return wget_utf8((const char **) str, sz);
 210         } else {
 211                 /*
 212                  * Raw 8-bit characters without any conversion. For Joliet,
 213                  * this effectively assumes provided file name is using
 214                  * ISO-8859-1 subset.
 215                  */
 216                 u_int16_t c = *str[0];
 217                 (*str)++;
 218                 (*sz)--;
 219
 220                 return c;
 221         }
 222 }
 223
 224 static int
 225 wput(u_char *s, size_t n, u_int16_t c, int joliet_level)
 226 {
 227         if (joliet_level > 0 && cd9660_utf8_joliet) {
 228                 /* Store Joliet file name encoded into UTF-8 */
 229                 return wput_utf8((char *)s, n, c);
 230         } else {
 231                 /*
 232                  * Store raw 8-bit characters without any conversion.
 233                  * For Joliet case, this filters the Unicode characters
 234                  * to ISO-8859-1 subset.
 235                  */
 236                 *s = (u_char)c;
 237                 return 1;
 238         }
 239 }