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/* $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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