Line data    Source code

       1             : /*      $OpenBSD: ntfs_conv.c,v 1.9 2013/11/24 16:02:30 jsing Exp $     */
       2             : /*      $NetBSD: ntfs_conv.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $   */
       3             : 
       4             : /*-
       5             :  * Copyright (c) 2001 The NetBSD Foundation, Inc.
       6             :  * All rights reserved.
       7             :  *
       8             :  * Redistribution and use in source and binary forms, with or without
       9             :  * modification, are permitted provided that the following conditions
      10             :  * are met:
      11             :  * 1. Redistributions of source code must retain the above copyright
      12             :  *    notice, this list of conditions and the following disclaimer.
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  *
      17             :  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
      18             :  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
      19             :  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
      20             :  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
      21             :  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
      22             :  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
      23             :  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
      24             :  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
      25             :  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      26             :  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
      27             :  * POSSIBILITY OF SUCH DAMAGE.
      28             :  */
      29             : 
      30             : /*
      31             :  * File name recode stuff.
      32             :  *
      33             :  * The utf-8 routines were derived from src/lib/libc/locale/utf2.c.
      34             :  */
      35             : 
      36             : #include <sys/param.h>
      37             : #include <sys/systm.h>
      38             : #include <sys/namei.h>
      39             : #include <sys/mount.h>
      40             : 
      41             : /* #define NTFS_DEBUG 1 */
      42             : #include <ntfs/ntfs.h>
      43             : #include <ntfs/ntfs_inode.h>
      44             : #include <ntfs/ntfs_subr.h>
      45             : 
      46             : /* UTF-8 encoding stuff */
      47             : 
      48             : static const int _utf_count[16] = {
      49             :         1, 1, 1, 1, 1, 1, 1, 1,
      50             :         0, 0, 0, 0, 2, 2, 3, 0,
      51             : };
      52             : 
      53             : /*
      54             :  * Read one wide character off the string, shift the string pointer
      55             :  * and return the character.
      56             :  */
      57             : wchar
      58           0 : ntfs_utf8_wget(const char **str)
      59             : {
      60             :         int c;
      61             :         wchar rune = 0;
      62           0 :         const char *s = *str;
      63             : 
      64           0 :         c = _utf_count[(s[0] >> 4) & 0xf];
      65           0 :         if (c == 0) {
      66             :                 c = 1;
      67           0 :                 goto encoding_error;
      68             :         }
      69             : 
      70           0 :         switch (c) {
      71             :         case 1:
      72           0 :                 rune = s[0] & 0xff;
      73           0 :                 break;
      74             :         case 2:
      75           0 :                 if ((s[1] & 0xc0) != 0x80)
      76             :                         goto encoding_error;
      77           0 :                 rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
      78           0 :                 break;
      79             :         case 3:
      80           0 :                 if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
      81             :                         goto encoding_error;
      82           0 :                 rune = ((s[0] & 0x1F) << 12) | ((s[1] & 0x3F) << 6) |
      83           0 :                     (s[2] & 0x3F);
      84           0 :                 break;
      85             :         }
      86             : 
      87             : encoding_error:
      88           0 :         *str = *str + c;
      89           0 :         return rune;
      90             : }
      91             : 
      92             : /*
      93             :  * Encode wide character and write it to the string. 'n' specifies
      94             :  * how much space there is in the string. Returns number of bytes written
      95             :  * to the target string.
      96             :  */
      97             : int
      98           0 : ntfs_utf8_wput(char *s, size_t n, wchar wc)
      99             : {
     100           0 :         if (wc & 0xf800) {
     101           0 :                 if (n < 3) {
     102             :                         /* bound check failure */
     103             :                         DDPRINTF("ntfs_utf8_wput: need 3 bytes\n");
     104           0 :                         return 0;
     105             :                 }
     106             : 
     107           0 :                 s[0] = 0xE0 | ((wc >> 12) & 0x0F);
     108           0 :                 s[1] = 0x80 | ((wc >> 6) & 0x3F);
     109           0 :                 s[2] = 0x80 | ((wc) & 0x3F);
     110           0 :                 return 3;
     111             :         } else {
     112           0 :                 if (wc & 0x0780) {
     113           0 :                         if (n < 2) {
     114             :                                 /* bound check failure */
     115             :                                 DDPRINTF("ntfs_utf8_wput: need 2 bytes\n");
     116           0 :                                 return 0;
     117             :                         }
     118             : 
     119           0 :                         s[0] = 0xC0 | ((wc >> 6) & 0x1F);
     120           0 :                         s[1] = 0x80 | ((wc) & 0x3F);
     121           0 :                         return 2;
     122             :                 } else {
     123           0 :                         if (n < 1) {
     124             :                                 /* bound check failure */
     125             :                                 DDPRINTF("ntfs_utf8_wput: need 1 byte\n");
     126           0 :                                 return 0;
     127             :                         }
     128             : 
     129           0 :                         s[0] = wc;
     130           0 :                         return 1;
     131             :                 }
     132             :         }
     133           0 : }
     134             : 
     135             : /*
     136             :  * Compare two wide characters, returning 1, 0, -1 if the first is
     137             :  * bigger, equal or lower than the second.
     138             :  */
     139             : int
     140           0 : ntfs_utf8_wcmp(wchar wc1, wchar wc2)
     141             : {
     142             :         /* no conversions needed for utf8 */
     143             : 
     144           0 :         if (wc1 == wc2)
     145           0 :                 return 0;
     146             :         else
     147           0 :                 return (int) wc1 - (int) wc2; 
     148           0 : }