/* $OpenBSD: msdosfs_conv.c,v 1.2 2021/10/06 00:40:41 deraadt 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 #include #include /* * MSDOSFS include files. */ #include "msdos/direntry.h" #include "msdos/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, int minuteswest, 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 - (minuteswest * 60) /* +- daylight saving time correction */ ; 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; } 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 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, 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 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; } /* * 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); }