FreeBSD/Linux Kernel Cross Reference
sys/ntfs/ntfs_conv.c

     /*      $OpenBSD: ntfs_conv.c,v 1.9 2013/11/24 16:02:30 jsing Exp $     */
     /*      $NetBSD: ntfs_conv.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $   */
     
     /*-
      * Copyright (c) 2001 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * File name recode stuff.
     *
     * The utf-8 routines were derived from src/lib/libc/locale/utf2.c.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/namei.h>
    #include <sys/mount.h>
    
    /* #define NTFS_DEBUG 1 */
    #include <ntfs/ntfs.h>
    #include <ntfs/ntfs_inode.h>
    #include <ntfs/ntfs_subr.h>
    
    /* UTF-8 encoding stuff */
    
    static const int _utf_count[16] = {
            1, 1, 1, 1, 1, 1, 1, 1,
            0, 0, 0, 0, 2, 2, 3, 0,
    };
    
    /*
     * Read one wide character off the string, shift the string pointer
     * and return the character.
     */
    wchar
    ntfs_utf8_wget(const char **str)
    {
            int c;
            wchar rune = 0;
            const char *s = *str;
    
            c = _utf_count[(s[0] >> 4) & 0xf];
            if (c == 0) {
                    c = 1;
                    goto encoding_error;
            }
    
            switch (c) {
            case 1:
                    rune = s[0] & 0xff;
                    break;
            case 2:
                    if ((s[1] & 0xc0) != 0x80)
                            goto encoding_error;
                    rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
                    break;
            case 3:
                    if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
                            goto encoding_error;
                    rune = ((s[0] & 0x1F) << 12) | ((s[1] & 0x3F) << 6) |
                        (s[2] & 0x3F);
                    break;
            }
    
    encoding_error:
            *str = *str + c;
            return rune;
    }
    
    /*
     * Encode wide character and write it to the string. 'n' specifies
     * how much space there is in the string. Returns number of bytes written
     * to the target string.
     */
    int
    ntfs_utf8_wput(char *s, size_t n, wchar wc)
    {
           if (wc & 0xf800) {
                   if (n < 3) {
                           /* bound check failure */
                           DDPRINTF("ntfs_utf8_wput: need 3 bytes\n");
                           return 0;
                   }
   
                   s[0] = 0xE0 | ((wc >> 12) & 0x0F);
                   s[1] = 0x80 | ((wc >> 6) & 0x3F);
                   s[2] = 0x80 | ((wc) & 0x3F);
                   return 3;
           } else {
                   if (wc & 0x0780) {
                           if (n < 2) {
                                   /* bound check failure */
                                   DDPRINTF("ntfs_utf8_wput: need 2 bytes\n");
                                   return 0;
                           }
   
                           s[0] = 0xC0 | ((wc >> 6) & 0x1F);
                           s[1] = 0x80 | ((wc) & 0x3F);
                           return 2;
                   } else {
                           if (n < 1) {
                                   /* bound check failure */
                                   DDPRINTF("ntfs_utf8_wput: need 1 byte\n");
                                   return 0;
                           }
   
                           s[0] = wc;
                           return 1;
                   }
           }
   }
   
   /*
    * Compare two wide characters, returning 1, 0, -1 if the first is
    * bigger, equal or lower than the second.
    */
   int
   ntfs_utf8_wcmp(wchar wc1, wchar wc2)
   {
           /* no conversions needed for utf8 */
   
           if (wc1 == wc2)
                   return 0;
           else
                   return (int) wc1 - (int) wc2; 
   }

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