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freebsd-skq/sys/fs/msdosfs/msdosfs_conv.c
Konstantin Belousov 48d1bcf8e0 - Add idempotency guards so the structures can be used in other utilities. 
- Update bpb structs with reserved fields.
- In direntry struct join deName with deExtension. Although a
  fix was attempted in the past, these fields were being overflowed,
  Now this is consistent with the spec, and we can now share the
  WinChksum code with NetBSD.

Submitted by:	Pedro F. Giffuni <giffunip tutopia com>
Mostly obtained from:	NetBSD
Reviewed by:	bde
MFC after:	2 weeks
2010-02-13 12:41:07 +00:00

1101 lines
29 KiB
C
Raw Blame History

/* $FreeBSD$ */
/* $NetBSD: msdosfs_conv.c,v 1.25 1997/11/17 15:36:40 ws Exp $ */
/*-
* Copyright (C) 1995, 1997 Wolfgang Solfrank.
* Copyright (C) 1995, 1997 TooLs GmbH.
* All rights reserved.
* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
/*-
* Written by Paul Popelka (paulp@uts.amdahl.com)
*
* You can do anything you want with this software, just don't say you wrote
* it, and don't remove this notice.
*
* This software is provided "as is".
*
* The author supplies this software to be publicly redistributed on the
* understanding that the author is not responsible for the correct
* functioning of this software in any circumstances and is not liable for
* any damages caused by this software.
*
* October 1992
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/dirent.h>
#include <sys/iconv.h>
#include <sys/mount.h>
#include <fs/msdosfs/bpb.h>
#include <fs/msdosfs/direntry.h>
#include <fs/msdosfs/msdosfsmount.h>
extern struct iconv_functions *msdosfs_iconv;
static int mbsadjpos(const char **, size_t, size_t, int, int, void *handle);
static u_int16_t dos2unixchr(const u_char **, size_t *, int, struct msdosfsmount *);
static u_int16_t unix2doschr(const u_char **, size_t *, struct msdosfsmount *);
static u_int16_t win2unixchr(u_int16_t, struct msdosfsmount *);
static u_int16_t unix2winchr(const u_char **, size_t *, int, struct msdosfsmount *);
/*
* 0 - character disallowed in long file name.
* 1 - character should be replaced by '_' in DOS file name,
* and generation number inserted.
* 2 - character ('.' and ' ') should be skipped in DOS file name,
* and generation number inserted.
*/
static u_char
unix2dos[256] = {
/* iso8859-1 -> cp850 */
0, 0, 0, 0, 0, 0, 0, 0, /* 00-07 */
0, 0, 0, 0, 0, 0, 0, 0, /* 08-0f */
0, 0, 0, 0, 0, 0, 0, 0, /* 10-17 */
0, 0, 0, 0, 0, 0, 0, 0, /* 18-1f */
2, 0x21, 0, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
0x28, 0x29, 0, 1, 1, 0x2d, 2, 0, /* 28-2f */
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
0x38, 0x39, 0, 1, 0, 1, 0, 0, /* 38-3f */
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
0x58, 0x59, 0x5a, 1, 0, 1, 0x5e, 0x5f, /* 58-5f */
0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 60-67 */
0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 68-6f */
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 70-77 */
0x58, 0x59, 0x5a, 0x7b, 0, 0x7d, 0x7e, 0, /* 78-7f */
0, 0, 0, 0, 0, 0, 0, 0, /* 80-87 */
0, 0, 0, 0, 0, 0, 0, 0, /* 88-8f */
0, 0, 0, 0, 0, 0, 0, 0, /* 90-97 */
0, 0, 0, 0, 0, 0, 0, 0, /* 98-9f */
0, 0xad, 0xbd, 0x9c, 0xcf, 0xbe, 0xdd, 0xf5, /* a0-a7 */
0xf9, 0xb8, 0xa6, 0xae, 0xaa, 0xf0, 0xa9, 0xee, /* a8-af */
0xf8, 0xf1, 0xfd, 0xfc, 0xef, 0xe6, 0xf4, 0xfa, /* b0-b7 */
0xf7, 0xfb, 0xa7, 0xaf, 0xac, 0xab, 0xf3, 0xa8, /* b8-bf */
0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* c0-c7 */
0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* c8-cf */
0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0x9e, /* d0-d7 */
0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0xe1, /* d8-df */
0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* e0-e7 */
0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* e8-ef */
0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0xf6, /* f0-f7 */
0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0x98, /* f8-ff */
};
static u_char
dos2unix[256] = {
/* cp850 -> iso8859-1 */
0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 00-07 */
0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 08-0f */
0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 10-17 */
0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 18-1f */
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
0xc7, 0xfc, 0xe9, 0xe2, 0xe4, 0xe0, 0xe5, 0xe7, /* 80-87 */
0xea, 0xeb, 0xe8, 0xef, 0xee, 0xec, 0xc4, 0xc5, /* 88-8f */
0xc9, 0xe6, 0xc6, 0xf4, 0xf6, 0xf2, 0xfb, 0xf9, /* 90-97 */
0xff, 0xd6, 0xdc, 0xf8, 0xa3, 0xd8, 0xd7, 0x3f, /* 98-9f */
0xe1, 0xed, 0xf3, 0xfa, 0xf1, 0xd1, 0xaa, 0xba, /* a0-a7 */
0xbf, 0xae, 0xac, 0xbd, 0xbc, 0xa1, 0xab, 0xbb, /* a8-af */
0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xc1, 0xc2, 0xc0, /* b0-b7 */
0xa9, 0x3f, 0x3f, 0x3f, 0x3f, 0xa2, 0xa5, 0x3f, /* b8-bf */
0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xe3, 0xc3, /* c0-c7 */
0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xa4, /* c8-cf */
0xf0, 0xd0, 0xca, 0xcb, 0xc8, 0x3f, 0xcd, 0xce, /* d0-d7 */
0xcf, 0x3f, 0x3f, 0x3f, 0x3f, 0xa6, 0xcc, 0x3f, /* d8-df */
0xd3, 0xdf, 0xd4, 0xd2, 0xf5, 0xd5, 0xb5, 0xfe, /* e0-e7 */
0xde, 0xda, 0xdb, 0xd9, 0xfd, 0xdd, 0xaf, 0x3f, /* e8-ef */
0xad, 0xb1, 0x3f, 0xbe, 0xb6, 0xa7, 0xf7, 0xb8, /* f0-f7 */
0xb0, 0xa8, 0xb7, 0xb9, 0xb3, 0xb2, 0x3f, 0x3f, /* f8-ff */
};
static u_char
u2l[256] = {
/* tolower */
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
};
static u_char
l2u[256] = {
/* toupper */
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
};
/*
* DOS filenames are made of 2 parts, the name part and the extension part.
* The name part is 8 characters long and the extension part is 3
* characters long. They may contain trailing blanks if the name or
* extension are not long enough to fill their respective fields.
*/
/*
* Convert a DOS filename to a unix filename. And, return the number of
* characters in the resulting unix filename excluding the terminating
* null.
*/
int
dos2unixfn(dn, un, lower, pmp)
u_char dn[11];
u_char *un;
int lower;
struct msdosfsmount *pmp;
{
size_t i;
int thislong = 0;
u_int16_t c;
/*
* If first char of the filename is SLOT_E5 (0x05), then the real
* first char of the filename should be 0xe5. But, they couldn't
* just have a 0xe5 mean 0xe5 because that is used to mean a freed
* directory slot. Another dos quirk.
*/
if (*dn == SLOT_E5)
*dn = 0xe5;
/*
* Copy the name portion into the unix filename string.
*/
for (i = 8; i > 0 && *dn != ' ';) {
c = dos2unixchr((const u_char **)&dn, &i, lower & LCASE_BASE,
pmp);
if (c & 0xff00) {
*un++ = c >> 8;
thislong++;
}
*un++ = c;
thislong++;
}
dn += i;
/*
* Now, if there is an extension then put in a period and copy in
* the extension.
*/
if (*dn != ' ') {
*un++ = '.';
thislong++;
for (i = 3; i > 0 && *dn != ' ';) {
c = dos2unixchr((const u_char **)&dn, &i,
lower & LCASE_EXT, pmp);
if (c & 0xff00) {
*un++ = c >> 8;
thislong++;
}
*un++ = c;
thislong++;
}
}
*un++ = 0;
return (thislong);
}
/*
* Convert a unix filename to a DOS filename according to Win95 rules.
* If applicable and gen is not 0, it is inserted into the converted
* filename as a generation number.
* Returns
* 0 if name couldn't be converted
* 1 if the converted name is the same as the original
* (no long filename entry necessary for Win95)
* 2 if conversion was successful
* 3 if conversion was successful and generation number was inserted
*/
int
unix2dosfn(un, dn, unlen, gen, pmp)
const u_char *un;
u_char dn[12];
size_t unlen;
u_int gen;
struct msdosfsmount *pmp;
{
ssize_t i, j;
int l;
int conv = 1;
const u_char *cp, *dp, *dp1;
u_char gentext[6], *wcp;
u_int16_t c;
/*
* Fill the dos filename string with blanks. These are DOS's pad
* characters.
*/
for (i = 0; i < 11; i++)
dn[i] = ' ';
dn[11] = 0;
/*
* The filenames "." and ".." are handled specially, since they
* don't follow dos filename rules.
*/
if (un[0] == '.' && unlen == 1) {
dn[0] = '.';
return gen <= 1;
}
if (un[0] == '.' && un[1] == '.' && unlen == 2) {
dn[0] = '.';
dn[1] = '.';
return gen <= 1;
}
/*
* Filenames with only blanks and dots are not allowed!
*/
for (cp = un, i = unlen; --i >= 0; cp++)
if (*cp != ' ' && *cp != '.')
break;
if (i < 0)
return 0;
/*
* Filenames with some characters are not allowed!
*/
for (cp = un, i = unlen; i > 0;)
if (unix2doschr(&cp, (size_t *)&i, pmp) == 0)
return 0;
/*
* Now find the extension
* Note: dot as first char doesn't start extension
* and trailing dots and blanks are ignored
* Note(2003/7): It seems recent Windows has
* defferent rule than this code, that Windows
* ignores all dots before extension, and use all
* chars as filename except for dots.
*/
dp = dp1 = 0;
for (cp = un + 1, i = unlen - 1; --i >= 0;) {
switch (*cp++) {
case '.':
if (!dp1)
dp1 = cp;
break;
case ' ':
break;
default:
if (dp1)
dp = dp1;
dp1 = 0;
break;
}
}
/*
* Now convert it (this part is for extension).
* As Windows XP do, if it's not ascii char,
* this function should return 2 or 3, so that checkng out Unicode name.
*/
if (dp) {
if (dp1)
l = dp1 - dp;
else
l = unlen - (dp - un);
for (cp = dp, i = l, j = 8; i > 0 && j < 11; j++) {
c = unix2doschr(&cp, (size_t *)&i, pmp);
if (c & 0xff00) {
dn[j] = c >> 8;
if (++j < 11) {
dn[j] = c;
if (conv != 3)
conv = 2;
continue;
} else {
conv = 3;
dn[j-1] = ' ';
break;
}
} else {
dn[j] = c;
}
if (((dn[j] & 0x80) || *(cp - 1) != dn[j]) && conv != 3)
conv = 2;
if (dn[j] == 1) {
conv = 3;
dn[j] = '_';
}
if (dn[j] == 2) {
conv = 3;
dn[j--] = ' ';
}
}
if (i > 0)
conv = 3;
dp--;
} else {
for (dp = cp; *--dp == ' ' || *dp == '.';);
dp++;
}
/*
* Now convert the rest of the name
*/
for (i = dp - un, j = 0; un < dp && j < 8; j++) {
c = unix2doschr(&un, &i, pmp);
if (c & 0xff00) {
dn[j] = c >> 8;
if (++j < 8) {
dn[j] = c;
if (conv != 3)
conv = 2;
continue;
} else {
conv = 3;
dn[j-1] = ' ';
break;
}
} else {
dn[j] = c;
}
if (((dn[j] & 0x80) || *(un - 1) != dn[j]) && conv != 3)
conv = 2;
if (dn[j] == 1) {
conv = 3;
dn[j] = '_';
}
if (dn[j] == 2) {
conv = 3;
dn[j--] = ' ';
}
}
if (un < dp)
conv = 3;
/*
* If we didn't have any chars in filename,
* generate a default
*/
if (!j)
dn[0] = '_';
/*
* If there wasn't any char dropped,
* there is no place for generation numbers
*/
if (conv != 3) {
if (gen > 1)
conv = 0;
goto done;
}
/*
* Now insert the generation number into the filename part
*/
if (gen == 0)
goto done;
for (wcp = gentext + sizeof(gentext); wcp > gentext && gen; gen /= 10)
*--wcp = gen % 10 + '0';
if (gen) {
conv = 0;
goto done;
}
for (i = 8; dn[--i] == ' ';);
i++;
if (gentext + sizeof(gentext) - wcp + 1 > 8 - i)
i = 8 - (gentext + sizeof(gentext) - wcp + 1);
/*
* Correct posision to where insert the generation number
*/
cp = dn;
i -= mbsadjpos((const char**)&cp, i, unlen, 1, pmp->pm_flags, pmp->pm_d2u);
dn[i++] = '~';
while (wcp < gentext + sizeof(gentext))
dn[i++] = *wcp++;
/*
* Tail of the filename should be space
*/
while (i < 8)
dn[i++] = ' ';
conv = 3;
done:
/*
* The first character cannot be E5,
* because that means a deleted entry
*/
if (dn[0] == 0xe5)
dn[0] = SLOT_E5;
return conv;
}
/*
* Create a Win95 long name directory entry
* Note: assumes that the filename is valid,
* i.e. doesn't consist solely of blanks and dots
*/
int
unix2winfn(un, unlen, wep, cnt, chksum, pmp)
const u_char *un;
size_t unlen;
struct winentry *wep;
int cnt;
int chksum;
struct msdosfsmount *pmp;
{
u_int8_t *wcp;
int i, end;
u_int16_t code;
/*
* Drop trailing blanks and dots
*/
unlen = winLenFixup(un, unlen);
/*
* Cut *un for this slot
*/
unlen = mbsadjpos((const char **)&un, unlen, (cnt - 1) * WIN_CHARS, 2,
pmp->pm_flags, pmp->pm_u2w);
/*
* Initialize winentry to some useful default
*/
for (wcp = (u_int8_t *)wep, i = sizeof(*wep); --i >= 0; *wcp++ = 0xff);
wep->weCnt = cnt;
wep->weAttributes = ATTR_WIN95;
wep->weReserved1 = 0;
wep->weChksum = chksum;
wep->weReserved2 = 0;
/*
* Now convert the filename parts
*/
end = 0;
for (wcp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0 && !end;) {
code = unix2winchr(&un, &unlen, 0, pmp);
*wcp++ = code;
*wcp++ = code >> 8;
if (!code)
end = WIN_LAST;
}
for (wcp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0 && !end;) {
code = unix2winchr(&un, &unlen, 0, pmp);
*wcp++ = code;
*wcp++ = code >> 8;
if (!code)
end = WIN_LAST;
}
for (wcp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0 && !end;) {
code = unix2winchr(&un, &unlen, 0, pmp);
*wcp++ = code;
*wcp++ = code >> 8;
if (!code)
end = WIN_LAST;
}
if (*un == '\0')
end = WIN_LAST;
wep->weCnt |= end;
return !end;
}
/*
* Compare our filename to the one in the Win95 entry
* Returns the checksum or -1 if no match
*/
int
winChkName(nbp, un, unlen, chksum, pmp)
struct mbnambuf *nbp;
const u_char *un;
size_t unlen;
int chksum;
struct msdosfsmount *pmp;
{
size_t len;
u_int16_t c1, c2;
u_char *np;
struct dirent dirbuf;
/*
* We already have winentry in *nbp.
*/
if (!mbnambuf_flush(nbp, &dirbuf) || dirbuf.d_namlen == 0)
return -1;
#ifdef MSDOSFS_DEBUG
printf("winChkName(): un=%s:%d,d_name=%s:%d\n", un, unlen,
dirbuf.d_name,
dirbuf.d_namlen);
#endif
/*
* Compare the name parts
*/
len = dirbuf.d_namlen;
if (unlen != len)
return -2;
for (np = dirbuf.d_name; unlen > 0 && len > 0;) {
/*
* Comparison must be case insensitive, because FAT disallows
* to look up or create files in case sensitive even when
* it's a long file name.
*/
c1 = unix2winchr((const u_char **)&np, &len, LCASE_BASE, pmp);
c2 = unix2winchr(&un, &unlen, LCASE_BASE, pmp);
if (c1 != c2)
return -2;
}
return chksum;
}
/*
* Convert Win95 filename to dirbuf.
* Returns the checksum or -1 if impossible
*/
int
win2unixfn(nbp, wep, chksum, pmp)
struct mbnambuf *nbp;
struct winentry *wep;
int chksum;
struct msdosfsmount *pmp;
{
u_int8_t *cp;
u_int8_t *np, name[WIN_CHARS * 2 + 1];
u_int16_t code;
int i;
if ((wep->weCnt&WIN_CNT) > howmany(WIN_MAXLEN, WIN_CHARS)
|| !(wep->weCnt&WIN_CNT))
return -1;
/*
* First compare checksums
*/
if (wep->weCnt&WIN_LAST) {
chksum = wep->weChksum;
} else if (chksum != wep->weChksum)
chksum = -1;
if (chksum == -1)
return -1;
/*
* Convert the name parts
*/
np = name;
for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
code = (cp[1] << 8) | cp[0];
switch (code) {
case 0:
*np = '\0';
mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
return chksum;
case '/':
*np = '\0';
return -1;
default:
code = win2unixchr(code, pmp);
if (code & 0xff00)
*np++ = code >> 8;
*np++ = code;
break;
}
cp += 2;
}
for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
code = (cp[1] << 8) | cp[0];
switch (code) {
case 0:
*np = '\0';
mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
return chksum;
case '/':
*np = '\0';
return -1;
default:
code = win2unixchr(code, pmp);
if (code & 0xff00)
*np++ = code >> 8;
*np++ = code;
break;
}
cp += 2;
}
for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
code = (cp[1] << 8) | cp[0];
switch (code) {
case 0:
*np = '\0';
mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
return chksum;
case '/':
*np = '\0';
return -1;
default:
code = win2unixchr(code, pmp);
if (code & 0xff00)
*np++ = code >> 8;
*np++ = code;
break;
}
cp += 2;
}
*np = '\0';
mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
return chksum;
}
/*
* Compute the unrolled checksum of a DOS filename for Win95 LFN use.
*/
u_int8_t
winChksum(u_int8_t *name)
{
int i;
u_int8_t s;
for (s = 0, i = 11; --i >= 0; s += *name++)
s = (s << 7)|(s >> 1);
return (s);
}
/*
* Determine the number of slots necessary for Win95 names
*/
int
winSlotCnt(un, unlen, pmp)
const u_char *un;
size_t unlen;
struct msdosfsmount *pmp;
{
size_t wlen;
char wn[WIN_MAXLEN * 2 + 1], *wnp;
unlen = winLenFixup(un, unlen);
if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
wlen = WIN_MAXLEN * 2;
wnp = wn;
msdosfs_iconv->conv(pmp->pm_u2w, (const char **)&un, &unlen, &wnp, &wlen);
if (unlen > 0)
return 0;
return howmany(WIN_MAXLEN - wlen/2, WIN_CHARS);
}
if (unlen > WIN_MAXLEN)
return 0;
return howmany(unlen, WIN_CHARS);
}
/*
* Determine the number of bytes neccesary for Win95 names
*/
size_t
winLenFixup(un, unlen)
const u_char* un;
size_t unlen;
{
for (un += unlen; unlen > 0; unlen--)
if (*--un != ' ' && *un != '.')
break;
return unlen;
}
/*
* Store an area with multi byte string instr, and reterns left
* byte of instr and moves pointer forward. The area's size is
* inlen or outlen.
*/
static int
mbsadjpos(const char **instr, size_t inlen, size_t outlen, int weight, int flag, void *handle)
{
char *outp, outstr[outlen * weight + 1];
if (flag & MSDOSFSMNT_KICONV && msdosfs_iconv) {
outp = outstr;
outlen *= weight;
msdosfs_iconv->conv(handle, instr, &inlen, &outp, &outlen);
return (inlen);
}
(*instr) += min(inlen, outlen);
return (inlen - min(inlen, outlen));
}
/*
* Convert DOS char to Local char
*/
static u_int16_t
dos2unixchr(const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
{
u_char c;
char *outp, outbuf[3];
u_int16_t wc;
size_t len, olen;
if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
olen = len = 2;
outp = outbuf;
if (lower & (LCASE_BASE | LCASE_EXT))
msdosfs_iconv->convchr_case(pmp->pm_d2u, (const char **)instr,
ilen, &outp, &olen, KICONV_LOWER);
else
msdosfs_iconv->convchr(pmp->pm_d2u, (const char **)instr,
ilen, &outp, &olen);
len -= olen;
/*
* return '?' if failed to convert
*/
if (len == 0) {
(*ilen)--;
(*instr)++;
return ('?');
}
wc = 0;
while(len--)
wc |= (*(outp - len - 1) & 0xff) << (len << 3);
return (wc);
}
(*ilen)--;
c = *(*instr)++;
c = dos2unix[c];
if (lower & (LCASE_BASE | LCASE_EXT))
c = u2l[c];
return ((u_int16_t)c);
}
/*
* Convert Local char to DOS char
*/
static u_int16_t
unix2doschr(const u_char **instr, size_t *ilen, struct msdosfsmount *pmp)
{
u_char c;
char *up, *outp, unicode[3], outbuf[3];
u_int16_t wc;
size_t len, ucslen, unixlen, olen;
if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
/*
* to hide an invisible character, using a unicode filter
*/
ucslen = 2;
len = *ilen;
up = unicode;
msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
ilen, &up, &ucslen);
unixlen = len - *ilen;
/*
* cannot be converted
*/
if (unixlen == 0) {
(*ilen)--;
(*instr)++;
return (0);
}
/*
* return magic number for ascii char
*/
if (unixlen == 1) {
c = *(*instr -1);
if (! (c & 0x80)) {
c = unix2dos[c];
if (c <= 2)
return (c);
}
}
/*
* now convert using libiconv
*/
*instr -= unixlen;
*ilen = len;
olen = len = 2;
outp = outbuf;
msdosfs_iconv->convchr_case(pmp->pm_u2d, (const char **)instr,
ilen, &outp, &olen, KICONV_FROM_UPPER);
len -= olen;
/*
* cannot be converted, but has unicode char, should return magic number
*/
if (len == 0) {
(*ilen) -= unixlen;
(*instr) += unixlen;
return (1);
}
wc = 0;
while(len--)
wc |= (*(outp - len - 1) & 0xff) << (len << 3);
return (wc);
}
(*ilen)--;
c = *(*instr)++;
c = l2u[c];
c = unix2dos[c];
return ((u_int16_t)c);
}
/*
* Convert Windows char to Local char
*/
static u_int16_t
win2unixchr(u_int16_t wc, struct msdosfsmount *pmp)
{
u_char *inp, *outp, inbuf[3], outbuf[3];
size_t ilen, olen, len;
if (wc == 0)
return (0);
if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
inbuf[0] = (u_char)(wc>>8);
inbuf[1] = (u_char)wc;
inbuf[2] = '\0';
ilen = olen = len = 2;
inp = inbuf;
outp = outbuf;
msdosfs_iconv->convchr(pmp->pm_w2u, (const char **)&inp, &ilen,
(char **)&outp, &olen);
len -= olen;
/*
* return '?' if failed to convert
*/
if (len == 0) {
wc = '?';
return (wc);
}
wc = 0;
while(len--)
wc |= (*(outp - len - 1) & 0xff) << (len << 3);
return (wc);
}
if (wc & 0xff00)
wc = '?';
return (wc);
}
/*
* Convert Local char to Windows char
*/
static u_int16_t
unix2winchr(const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
{
u_char *outp, outbuf[3];
u_int16_t wc;
size_t olen;
if (*ilen == 0)
return (0);
if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
outp = outbuf;
olen = 2;
if (lower & (LCASE_BASE | LCASE_EXT))
msdosfs_iconv->convchr_case(pmp->pm_u2w, (const char **)instr,
ilen, (char **)&outp, &olen,
KICONV_FROM_LOWER);
else
msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
ilen, (char **)&outp, &olen);
/*
* return '0' if end of filename
*/
if (olen == 2)
return (0);
wc = (outbuf[0]<<8) | outbuf[1];
return (wc);
}
(*ilen)--;
wc = (*instr)[0];
if (lower & (LCASE_BASE | LCASE_EXT))
wc = u2l[wc];
(*instr)++;
return (wc);
}
/*
* Initialize the temporary concatenation buffer.
*/
void
mbnambuf_init(struct mbnambuf *nbp)
{
nbp->nb_len = 0;
nbp->nb_last_id = -1;
nbp->nb_buf[sizeof(nbp->nb_buf) - 1] = '\0';
}
/*
* Fill out our concatenation buffer with the given substring, at the offset
* specified by its id. Since this function must be called with ids in
* descending order, we take advantage of the fact that ASCII substrings are
* exactly WIN_CHARS in length. For non-ASCII substrings, we shift all
* previous (i.e. higher id) substrings upwards to make room for this one.
* This only penalizes portions of substrings that contain more than
* WIN_CHARS bytes when they are first encountered.
*/
void
mbnambuf_write(struct mbnambuf *nbp, char *name, int id)
{
char *slot;
size_t count, newlen;
if (nbp->nb_len != 0 && id != nbp->nb_last_id - 1) {
printf("msdosfs: non-decreasing id: id %d, last id %d\n",
id, nbp->nb_last_id);
return;
}
/* Will store this substring in a WIN_CHARS-aligned slot. */
slot = &nbp->nb_buf[id * WIN_CHARS];
count = strlen(name);
newlen = nbp->nb_len + count;
if (newlen > WIN_MAXLEN || newlen > MAXNAMLEN) {
printf("msdosfs: file name length %zu too large\n", newlen);
return;
}
/* Shift suffix upwards by the amount length exceeds WIN_CHARS. */
if (count > WIN_CHARS && nbp->nb_len != 0)
bcopy(slot + WIN_CHARS, slot + count, nbp->nb_len);
/* Copy in the substring to its slot and update length so far. */
bcopy(name, slot, count);
nbp->nb_len = newlen;
nbp->nb_last_id = id;
}
/*
* Take the completed string and use it to setup the struct dirent.
* Be sure to always nul-terminate the d_name and then copy the string
* from our buffer. Note that this function assumes the full string has
* been reassembled in the buffer. If it's called before all substrings
* have been written via mbnambuf_write(), the result will be incorrect.
*/
char *
mbnambuf_flush(struct mbnambuf *nbp, struct dirent *dp)
{
if (nbp->nb_len > sizeof(dp->d_name) - 1) {
mbnambuf_init(nbp);
return (NULL);
}
bcopy(&nbp->nb_buf[0], dp->d_name, nbp->nb_len);
dp->d_name[nbp->nb_len] = '\0';
dp->d_namlen = nbp->nb_len;
mbnambuf_init(nbp);
return (dp->d_name);
}
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