add directory study

study/sabre/os/files/FileSystems/LF2.txt

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+From: noesis@ucscb.UCSC.EDU (Kyle Anthony York)
+Newsgroups: comp.os.msdos.programmer
+Subject: Re: Win95 FAT long file name storage?
+
+ok, here goes:
+
+long file names are stored as follows, i've been using direct sector
+access, so i don't know if findfirst(..) findnext(..) will work.
+
+the long names are stored as unicode strings in the immediatly preceding
+entries. the entry attribute byte is 0x0f.
+
+the long name format is also used whenever a filename has lower case 
+characters, thus preserving case and backwards compatability.
+
+so...if the name is ``abcdefghijklmnop'' and this is the first entry of a 
+subdirectory:
+  entry[0] = "."
+  entry[1] = ".."
+  entry[2] = "ijklmnop", attribute = 0x0f
+  entry[3] = "abcdefgh", attribute = 0x0f
+  entry[4] = "ABCDEF~1", attribute = normal
+
+in addition to having the attribute 0x0f, the entry format is:
+  BYTE 0 ---   bit 7 = 1 if deleted, 0 if not
+                   6 = 1 if last block of extended entry, 0 if not
+                   5..0 = extended entry # (1..31)
+  BYTE 1..10 --- first 5 characters in unicode ("abcde" becomes 
+                 "a", 0, "b", 0, "c", 0, "d", 0, "e", 0
+  BYTE 11   --- attribute (0x0f)
+  BYTE 12   --- ?? unknown ??
+  BYTE 13   --- ?? unknown ??
+  BYTE 14..25 -- next 6 characters (in unicode)
+  BYTE 26..27 --- 0x0000 (first cluster #)
+  BYTE 28..31 --- last 4 characters (in unicode)
+
+unused bytes are set to 0xff
+end of string is denoted by 0x00, 0x00
+
+best o' luck
+--kyle