mischief/openbsd-src
1
0
Fork 0
mirror of https://github.com/openbsd/src.git synced 2024-12-22 07:27:59 -08:00
Code
master
openbsd-src/sys/msdosfs/msdosfs_conv.c
claudio febe0fa6d0 msdos already transfroms for Windows long names a '/' char into '?'. 
Do the same for the 8.3 case as well.

This is not ideal since now it is possible that two files in the same
directory have the same name but the msdos code already does a lot of
this and so the problem already exists.

OK beck@ miod@
2024-09-12 09:07:28 +00:00

812 lines
22 KiB
C
Raw Permalink Blame History

/* $OpenBSD: msdosfs_conv.c,v 1.22 2024/09/12 09:07:28 claudio Exp $ */
/* $NetBSD: msdosfs_conv.c,v 1.24 1997/10/17 11:23:54 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
*/
/*
* System include files.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h> /* defines tz */
#include <sys/dirent.h>
#include <sys/vnode.h>
#include <sys/lock.h>
/*
* MSDOSFS include files.
*/
#include <msdosfs/direntry.h>
#include <msdosfs/denode.h>
/*
* Days in each month in a regular year.
*/
const u_short regyear[] = {
31, 28, 31, 30, 31, 30,
31, 31, 30, 31, 30, 31
};
/*
* Days in each month in a leap year.
*/
const u_short leapyear[] = {
31, 29, 31, 30, 31, 30,
31, 31, 30, 31, 30, 31
};
/*
* Variables used to remember parts of the last time conversion. Maybe we
* can avoid a full conversion.
*/
time_t lasttime;
uint32_t lastday;
u_short lastddate;
u_short lastdtime;
/*
* Convert the unix version of time to dos's idea of time to be used in
* file timestamps. The passed in unix time is assumed to be in GMT.
*/
void
unix2dostime(struct timespec *tsp, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp)
{
time_t t;
uint32_t days;
uint32_t inc;
uint32_t year;
uint32_t month;
const u_short *months;
/*
* If the time from the last conversion is the same as now, then
* skip the computations and use the saved result.
*/
t = tsp->tv_sec;
t &= ~1;
/*
* Before 1/1/1980 there is only a timeless void. After 12/31/2107
* there is only Cthulhu.
*/
#define DOSEPOCH 315532800LL
#define DOSENDTIME 4354775999LL
if (t < DOSEPOCH || t > DOSENDTIME)
t = DOSEPOCH;
if (lasttime != t) {
lasttime = t;
lastdtime = (((t / 2) % 30) << DT_2SECONDS_SHIFT)
+ (((t / 60) % 60) << DT_MINUTES_SHIFT)
+ (((t / 3600) % 24) << DT_HOURS_SHIFT);
/*
* If the number of days since 1970 is the same as the last
* time we did the computation then skip all this leap year
* and month stuff.
*/
days = t / (24 * 60 * 60);
if (days != lastday) {
lastday = days;
for (year = 1970;; year++) {
inc = year & 0x03 ? 365 : 366;
if (days < inc)
break;
days -= inc;
}
months = year & 0x03 ? regyear : leapyear;
for (month = 0; month < 12; month++) {
if (days < months[month])
break;
days -= months[month];
}
lastddate = ((days + 1) << DD_DAY_SHIFT)
+ ((month + 1) << DD_MONTH_SHIFT);
/*
* Remember dos's idea of time is relative to 1980.
* unix's is relative to 1970. If somehow we get a
* time before 1980 then don't give totally crazy
* results.
*/
if (year > 1980)
lastddate += (year - 1980) << DD_YEAR_SHIFT;
}
}
if (dtp != NULL)
*dtp = lastdtime;
if (dhp != NULL)
*dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
*ddp = lastddate;
}
/*
* The number of seconds between Jan 1, 1970 and Jan 1, 1980. In that
* interval there were 8 regular years and 2 leap years.
*/
#define SECONDSTO1980 (((8 * 365) + (2 * 366)) * (24 * 60 * 60))
u_short lastdosdate;
uint32_t lastseconds;
/*
* Convert from dos' idea of time to unix'. This will probably only be
* called from the stat(), and fstat() system calls and so probably need
* not be too efficient.
*/
void
dos2unixtime(u_int dd, u_int dt, u_int dh, struct timespec *tsp)
{
uint32_t seconds;
uint32_t m, month;
uint32_t y, year;
uint32_t days;
const u_short *months;
if (dd == 0) {
/*
* Uninitialized field, return the epoch.
*/
tsp->tv_sec = 0;
tsp->tv_nsec = 0;
return;
}
seconds = ((dt & DT_2SECONDS_MASK) >> DT_2SECONDS_SHIFT) * 2
+ ((dt & DT_MINUTES_MASK) >> DT_MINUTES_SHIFT) * 60
+ ((dt & DT_HOURS_MASK) >> DT_HOURS_SHIFT) * 3600
+ dh / 100;
/*
* If the year, month, and day from the last conversion are the
* same then use the saved value.
*/
if (lastdosdate != dd) {
lastdosdate = dd;
days = 0;
year = (dd & DD_YEAR_MASK) >> DD_YEAR_SHIFT;
for (y = 0; y < year; y++)
days += y & 0x03 ? 365 : 366;
months = year & 0x03 ? regyear : leapyear;
/*
* Prevent going from 0 to 0xffffffff in the following
* loop.
*/
month = (dd & DD_MONTH_MASK) >> DD_MONTH_SHIFT;
if (month == 0) {
printf("dos2unixtime(): month value out of range (%u)\n",
month);
month = 1;
}
for (m = 0; m < month - 1; m++)
days += months[m];
days += ((dd & DD_DAY_MASK) >> DD_DAY_SHIFT) - 1;
lastseconds = (days * 24 * 60 * 60) + SECONDSTO1980;
}
tsp->tv_sec = seconds + lastseconds;
tsp->tv_nsec = (dh % 100) * 10000000;
}
static const u_char
unix2dos[256] = {
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 */
0, 0x21, 0, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
0x28, 0x29, 0, 0, 0, 0x2d, 0, 0, /* 28-2f */
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
0x38, 0x39, 0, 0, 0, 0, 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, 0, 0, 0, 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 const u_char
dos2unix[256] = {
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, 0x3f, /* 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 const u_char
u2l[256] = {
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, 0x3f, /* 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(u_char dn[11], u_char *un, int lower)
{
int i;
int thislong = 1;
u_char 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)
c = dos2unix[0xe5];
else
c = dos2unix[*dn];
*un++ = lower ? u2l[c] : c;
dn++;
/*
* Copy the name portion into the unix filename string.
*/
for (i = 1; i < 8 && *dn != ' '; i++) {
c = dos2unix[*dn++];
*un++ = lower ? u2l[c] : c;
thislong++;
}
dn += 8 - i;
/*
* Now, if there is an extension then put in a period and copy in
* the extension.
*/
if (*dn != ' ') {
*un++ = '.';
thislong++;
for (i = 0; i < 3 && *dn != ' '; i++) {
c = dos2unix[*dn++];
*un++ = lower ? u2l[c] : 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(u_char *un, u_char dn[11], int unlen, u_int gen)
{
int i, j, l;
int conv = 1;
u_char *cp, *dp, *dp1;
u_char gentext[6];
/*
* Fill the dos filename string with blanks. These are DOS's pad
* characters.
*/
for (i = 0; i < 11; i++)
dn[i] = ' ';
/*
* 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;
/*
* Now find the extension
* Note: dot as first char doesn't start extension
* and trailing dots and blanks are ignored
*/
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
*/
if (dp) {
if (dp1)
l = dp1 - dp;
else
l = unlen - (dp - un);
for (i = 0, j = 8; i < l && j < 11; i++, j++) {
if (dp[i] != (dn[j] = unix2dos[dp[i]])
&& conv != 3)
conv = 2;
if (!dn[j]) {
conv = 3;
dn[j--] = ' ';
}
}
if (i < l)
conv = 3;
dp--;
} else {
for (dp = cp; *--dp == ' ' || *dp == '.';)
;
dp++;
}
/*
* Now convert the rest of the name
*/
for (i = j = 0; un < dp && j < 8; i++, j++, un++) {
if (*un != (dn[j] = unix2dos[*un])
&& conv != 3)
conv = 2;
if (!dn[j]) {
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] = '_';
/*
* The first character cannot be E5,
* because that means a deleted entry
*/
if (dn[0] == 0xe5)
dn[0] = SLOT_E5;
/*
* If there wasn't any char dropped,
* there is no place for generation numbers
*/
if (conv != 3) {
if (gen > 1)
return 0;
return conv;
}
/*
* Now insert the generation number into the filename part
*/
for (cp = gentext + sizeof(gentext); cp > gentext && gen; gen /= 10)
*--cp = gen % 10 + '0';
if (gen)
return 0;
for (i = 8; dn[--i] == ' ';)
;
if (gentext + sizeof(gentext) - cp + 1 > 8 - i)
i = 8 - (gentext + sizeof(gentext) - cp + 1);
dn[i++] = '~';
while (cp < gentext + sizeof(gentext))
dn[i++] = *cp++;
return 3;
}
/*
* 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(u_char *un, int unlen, struct winentry *wep, int cnt, int chksum)
{
u_int8_t *cp;
int i;
/*
* Drop trailing blanks and dots
*/
for (cp = un + unlen; *--cp == ' ' || *cp == '.'; unlen--)
;
un += (cnt - 1) * WIN_CHARS;
unlen -= (cnt - 1) * WIN_CHARS;
/*
* Initialize winentry to some useful default
*/
for (cp = (u_int8_t *)wep, i = sizeof(*wep); --i >= 0; *cp++ = 0xff)
;
wep->weCnt = cnt;
wep->weAttributes = ATTR_WIN95;
wep->weReserved1 = 0;
wep->weChksum = chksum;
wep->weReserved2 = 0;
/*
* Now convert the filename parts
*/
for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
if (--unlen < 0)
goto done;
*cp++ = *un++;
*cp++ = 0;
}
for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
if (--unlen < 0)
goto done;
*cp++ = *un++;
*cp++ = 0;
}
for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
if (--unlen < 0)
goto done;
*cp++ = *un++;
*cp++ = 0;
}
if (!unlen)
wep->weCnt |= WIN_LAST;
return unlen;
done:
*cp++ = 0;
*cp++ = 0;
wep->weCnt |= WIN_LAST;
return 0;
}
/*
* Compare our filename to the one in the Win95 entry
* Returns the checksum or -1 if no match
*/
int
winChkName(u_char *un, int unlen, struct winentry *wep, int chksum)
{
u_int8_t *cp;
int i;
/*
* First compare checksums
*/
if (wep->weCnt&WIN_LAST)
chksum = wep->weChksum;
else if (chksum != wep->weChksum)
chksum = -1;
if (chksum == -1)
return -1;
/*
* Offset of this entry
*/
i = ((wep->weCnt&WIN_CNT) - 1) * WIN_CHARS;
if ((unlen -= i) <= 0)
return -1;
un += i;
if ((wep->weCnt&WIN_LAST) && unlen > WIN_CHARS)
return -1;
/*
* Compare the name parts
*/
for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
if (--unlen < 0) {
if (!*cp++ && !*cp)
return chksum;
return -1;
}
if (u2l[*cp++] != u2l[*un++] || *cp++)
return -1;
}
for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
if (--unlen < 0) {
if (!*cp++ && !*cp)
return chksum;
return -1;
}
if (u2l[*cp++] != u2l[*un++] || *cp++)
return -1;
}
for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
if (--unlen < 0) {
if (!*cp++ && !*cp)
return chksum;
return -1;
}
if (u2l[*cp++] != u2l[*un++] || *cp++)
return -1;
}
return chksum;
}
/*
* Convert Win95 filename to dirbuf.
* Returns the checksum or -1 if impossible
*/
int
win2unixfn(struct winentry *wep, struct dirent *dp, int chksum)
{
u_int8_t *cp;
u_int8_t *np, *ep = dp->d_name + WIN_MAXLEN;
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;
/*
* This works even though d_namlen is one byte!
*/
dp->d_namlen = (wep->weCnt&WIN_CNT) * WIN_CHARS;
} else if (chksum != wep->weChksum)
chksum = -1;
if (chksum == -1)
return -1;
/*
* Offset of this entry
*/
i = ((wep->weCnt&WIN_CNT) - 1) * WIN_CHARS;
np = (u_int8_t *)dp->d_name + i;
/*
* Convert the name parts
*/
for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
switch (*np++ = *cp++) {
case 0:
dp->d_namlen -= sizeof(wep->wePart2)/2
+ sizeof(wep->wePart3)/2 + i + 1;
return chksum;
case '/':
np[-1] = 0;
return -1;
}
/*
* The size comparison should result in the compiler
* optimizing the whole if away
*/
if (WIN_MAXLEN % WIN_CHARS < sizeof(wep->wePart1) / 2
&& np > ep) {
np[-1] = 0;
return -1;
}
if (*cp++)
return -1;
}
for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
switch (*np++ = *cp++) {
case 0:
dp->d_namlen -= sizeof(wep->wePart3)/2 + i + 1;
return chksum;
case '/':
np[-1] = 0;
return -1;
}
/*
* The size comparisons should be optimized away
*/
if (WIN_MAXLEN % WIN_CHARS >= sizeof(wep->wePart1) / 2
&& WIN_MAXLEN % WIN_CHARS < (sizeof(wep->wePart1) + sizeof(wep->wePart2)) / 2
&& np > ep) {
np[-1] = 0;
return -1;
}
if (*cp++)
return -1;
}
for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
switch (*np++ = *cp++) {
case 0:
dp->d_namlen -= i + 1;
return chksum;
case '/':
np[-1] = 0;
return -1;
}
/*
* See above
*/
if (WIN_MAXLEN % WIN_CHARS >= (sizeof(wep->wePart1) + sizeof(wep->wePart2)) / 2
&& np > ep) {
np[-1] = 0;
return -1;
}
if (*cp++)
return -1;
}
return chksum;
}
/*
* Compute the checksum of a DOS filename for Win95 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(u_char *un, int unlen)
{
for (un += unlen; unlen > 0; unlen--)
if (*--un != ' ' && *un != '.')
break;
if (unlen > WIN_MAXLEN)
return 0;
return howmany(unlen, WIN_CHARS);
}
View Git Blame Copy Permalink