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/ntfs/ntfs_conv.c

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    1 /*      $NetBSD: ntfs_conv.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by the NetBSD
   18  *      Foundation, Inc. and its contributors.
   19  * 4. Neither the name of The NetBSD Foundation nor the names of its
   20  *    contributors may be used to endorse or promote products derived
   21  *    from this software without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33  * POSSIBILITY OF SUCH DAMAGE.
   34  */
   35 
   36 /*
   37  * File name recode stuff.
   38  *
   39  * The utf-8 routines were derived from basesrc/lib/libc/locale/utf2.c.
   40  */
   41 
   42 #include <sys/cdefs.h>
   43 __KERNEL_RCSID(0, "$NetBSD: ntfs_conv.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $");
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/namei.h>
   48 #include <sys/proc.h>
   49 #include <sys/kernel.h>
   50 #include <sys/vnode.h>
   51 #include <sys/mount.h>
   52 #include <sys/buf.h>
   53 #include <sys/file.h>
   54 #include <sys/malloc.h>
   55 #include <sys/lock.h>
   56 #if defined(__FreeBSD__)
   57 #include <machine/clock.h>
   58 #endif
   59 
   60 #include <miscfs/specfs/specdev.h>
   61 
   62 /* #define NTFS_DEBUG 1 */
   63 #include <fs/ntfs/ntfs.h>
   64 #include <fs/ntfs/ntfsmount.h>
   65 #include <fs/ntfs/ntfs_inode.h>
   66 #include <fs/ntfs/ntfs_vfsops.h>
   67 #include <fs/ntfs/ntfs_subr.h>
   68 #include <fs/ntfs/ntfs_compr.h>
   69 #include <fs/ntfs/ntfs_ihash.h>
   70 
   71 /* UTF-8 encoding stuff */
   72 
   73 static const int _utf_count[16] = {
   74         1, 1, 1, 1, 1, 1, 1, 1,
   75         0, 0, 0, 0, 2, 2, 3, 0,
   76 };
   77 
   78 /*
   79  * Read one wide character off the string, shift the string pointer
   80  * and return the character.
   81  */
   82 wchar
   83 ntfs_utf8_wget(const char **str)
   84 {
   85         int c;
   86         wchar rune = 0;
   87         const char *s = *str;
   88 
   89         c = _utf_count[(s[0] >> 4) & 0xf];
   90         if (c == 0) {
   91                 c = 1;
   92                 goto encoding_error;
   93         }
   94 
   95         switch (c) {
   96         case 1:
   97                 rune = s[0] & 0xff;
   98                 break;
   99         case 2:
  100                 if ((s[1] & 0xc0) != 0x80)
  101                         goto encoding_error;
  102                 rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
  103                 break;
  104         case 3:
  105                 if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
  106                         goto encoding_error;
  107                 rune = ((s[0] & 0x1F) << 12) | ((s[1] & 0x3F) << 6)
  108                     | (s[2] & 0x3F);
  109                 break;
  110         }
  111 
  112 encoding_error:
  113         *str = *str + c;
  114         return rune;
  115 }
  116 
  117 /*
  118  * Encode wide character and write it to the string. 'n' specifies
  119  * how much space there is in the string. Returns number of bytes written
  120  * to the target string.
  121  */
  122 int
  123 ntfs_utf8_wput(char *s, size_t n, wchar wc)
  124 {
  125         if (wc & 0xf800) {
  126                 if (n < 3) {
  127                         /* bound check failure */
  128                         ddprintf(("ntfs_utf8_wput: need 3 bytes\n"));
  129                         return 0;
  130                 }
  131 
  132                 s[0] = 0xE0 | ((wc >> 12) & 0x0F);
  133                 s[1] = 0x80 | ((wc >> 6) & 0x3F);
  134                 s[2] = 0x80 | ((wc) & 0x3F);
  135                 return 3;
  136         } else {
  137                 if (wc & 0x0780) {
  138                         if (n < 2) {
  139                                 /* bound check failure */
  140                                 ddprintf(("ntfs_utf8_wput: need 2 bytes\n"));
  141                                 return 0;
  142                         }
  143 
  144                         s[0] = 0xC0 | ((wc >> 6) & 0x1F);
  145                         s[1] = 0x80 | ((wc) & 0x3F);
  146                         return 2;
  147                 } else {
  148                         if (n < 1) {
  149                                 /* bound check failure */
  150                                 ddprintf(("ntfs_utf8_wput: need 1 byte\n"));
  151                                 return 0;
  152                         }
  153 
  154                         s[0] = wc;
  155                         return 1;
  156                 }
  157         }
  158 }
  159 
  160 /*
  161  * Compare two wide characters, returning 1, 0, -1 if the first is
  162  * bigger, equal or lower than the second.
  163  */
  164 int
  165 ntfs_utf8_wcmp(wchar wc1, wchar wc2)
  166 {
  167         /* no conversions needed for utf8 */
  168 
  169         if (wc1 == wc2)
  170                 return 0;
  171         else
  172                 return (int) wc1 - (int) wc2; 
  173 }

Cache object: 21101e1cad07d9b605d3f3c9107936e1


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