/*	$OpenBSD: msdosfs_conv.c,v 1.1 2016/10/18 17:05:30 natano 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/time.h>

#include <sys/dirent.h>

#include <sys/lock.h>

/*

 * 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.

	 */

	     /* +- daylight saving time correction */ ;

	/*

	 * Before 1/1/1980 there is only a timeless void. After 12/31/2107

	 * there is only Cthulhu.

	 */

#define DOSEPOCH 315532800LL

#define DOSENDTIME 4354775999LL

		t = DOSEPOCH;

		/*

		 * 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.

		 */

					break;

			}

					break;

			}

			/*

			 * 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.

			 */

		}

	}

}

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;

	/*

	 * Fill the dos filename string with blanks. These are DOS's pad

	 * characters.

	 */

	/*

	 * The filenames "." and ".." are handled specially, since they

	 * don't follow dos filename rules.

	 */

	}

	}

	/*

	 * Filenames with only blanks and dots are not allowed!

	 */

			break;

	/*

	 * Now find the extension

	 * Note: dot as first char doesn't start extension

	 *	 and trailing dots and blanks are ignored

	 */

	dp = dp1 = 0;

		case '.':

			break;

		case ' ':

			break;

		default:

			dp1 = 0;

		}

	}

	/*

	 * Now convert it

	 */

		else

				conv = 3;

			}

		}

	}

	/*

	 * Now convert the rest of the name

	 */

			conv = 3;

		}

	}

	/*

	 * If we didn't have any chars in filename,

	 * generate a default

	 */

	/*

	 * The first character cannot be E5,

	 * because that means a deleted entry

	 */

	/*

	 * If there wasn't any char dropped,

	 * there is no place for generation numbers

	 */

	}

	/*

	 * Now insert the generation number into the filename part

	 */

}

/*

 * 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

	 */

	/*

	 * Initialize winentry to some useful default

	 */

	/*

	 * Now convert the filename parts

	 */

			goto done;

	}

			goto done;

	}

			goto done;

	}

done:

}

/*

 * 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

	 */

	/*

	 * Offset of this entry

	 */

	/*

	 * Compare the name parts

	 */

		}

	}

		}

	}

		}

	}

}

/*

 * Compute the checksum of a DOS filename for Win95 use

 */

u_int8_t

winChksum(u_int8_t *name)

{

	int i;

	u_int8_t s;

}

/*

 * Determine the number of slots necessary for Win95 names

 */

int

winSlotCnt(u_char *un, int unlen)

{

			break;

}