Data Structure	  -    MS-DOS Directory Entry


12.01.84 - cbradley - from "Disk Operating System" (IBM Corp.)


The basic directory area for all types of disks is constructed by the FORMAT
utility.  The directory's location is available through the device driver
interfaces as a logical sector number.



MS-DOS directory entries are 32 bytes in length, in the following format:


Byte Offset	Description

0-7		Filename (text) - byte 0 indicates the file status

			byte 0 == 00	->	never been used
			byte 0 == E5	->	was used, now deleted
			byte 0 == 2E	->	is a subdirectory
			byte 0 == anything else is char 0 of the filename

8-10		Filename extension

11		File attribute.  Mapped as follows:

			01 -> read-only 	02 -> hidden file
			04 -> system file	08 -> volume label
			10 -> is sub-dir	20 -> Archive bit

12-21		Reserved.

22-23		Time-stamp of file creation or update.	Time is mapped into bits
		as shown below:

			<      hh     >    <	mm    >    <   xx  >
			 15 14 13 12 11    10 9 8 7 6 5    4 3 2 1 0

		where:

		     hh == binary number of hrs (0-23)

		     mm == binary number of mins (0-59)

		     xx == binary number of TWO-SECOND increments


24-25		Date-stamp of file creation or update.	Bits are mapped as
		follows:

			<	 25	    >	     <	   24	   >
			15 14 13 12 11 10 9 8	     7 6 5 4 3 2 1 0
			y  y  y  y  y  y  y m	     m m m d d d d d

		where:

			m == 1-12
			d == 1-31
			y == 0-119  (1980 to 2099)


26-27		Starting cluster number in FAT of file - the relative cluster
		number of the first cluster of disk belonging to the file


28-31		File size in bytes.  First word contains low-order part of the
		size figure.  Both words are stored with the LSB first.