Other data formats

• File attribute of MS-DOS
  
  
  • Introduction
    File attribute of MS-DOS shows properties of file. (System, Hidden, Read-only)
    
    
  • Construction

    	Bit No.	Description
    M L B /\ \/ M S B	15-7	Reserved
    	6	Reserved. In LHA for X680x0 sets this bit, if store the symbolic link to an archive.
    	5	Archive flag.
    	4	Sub directory flag.
    	3	Volume label flag.
    	2	System file flag.
    	1	Hidden file flag.
    	0	Read only flag.

  
  
  

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• Permission of UNIX
  
  
  • Introduction
    It shows allowing or denying the file access, and type of the file.
    
    
  • Construction

    	Bit No.	Description
    M L B /\ \/ M S B	15-12	1000 file 0100 directory
    	11	The flag which shows whether it performs by a file owner's authority.
    	10	The flag which shows whether it performs by the authority of the group of a file.
    	09	sticky bit. Only file owner and a superuser can delete a file in the directory which is set a sticky bit.
    	08	The flag which shows a file owner's reading permission.
    	07	The flag which shows a file owner's writing permission.
    	06	The flag which shows a file owner's executing permission.
    	05	The flag which shows reading permission of the group members.
    	04	The flag which shows writing permission of the group members.
    	03	The flag which shows executing permission of the group members.
    	02	The flag which shows reading permission of the all users.
    	01	The flag which shows writing permission of the all users.
    	00	The flag which shows executing permission of the all users.

  
  
  

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• ftime
  
  
  • Introduction
    A format which is used by MS-DOS. Note that it uses local time.
    
    
  • Recordable range
    from : 00:00:00 on Jan 1, 1980 ( 00 : 21 : 00 : 00 )
    to : 23:59:58 on Dec 31, 2107 ( FF : 9F : BF : 7F )
    
    
    
  • Structure

    Date(H)								Date(L)								Time(H)								Time(L)
    7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0
    Y	Y	Y	Y	Y	Y	Y	M	M	M	M	D	D	D	D	D	h	h	h	h	h	m	m	m	m	m	m	s	s	s	s	s

    
    
  • Construction

    char	Description
    Y	The progress year from 1980
    M	Note that 0 is not used, like this January :: 1, february :: 2 ..... December :: 12.
    D	Day. it uses 1 to 31. Not that 0 is not used.
    h	Hour. it uses 0 to 23.
    m	Minute. it uses 0 to 59.
    s	Second. it uses 0 to 29. Note that it is in units of 2 seconds.

  
  
  

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• time_t
  
  
  • Introduction
    It shows progress seconds from 00:00:00 on Jan 1, 1970 of Universal Coordinate Time. Note that this time_t causing a 2038 problem.
    
    
  • Recordable range
    In 4 byte time_t
    
    from : 00:00:00 on Jan 1, 1970 UTC ( 0 )
    to : 21:28:15 on Feb 5, 2106 UTC ( 4,294,967,295 )
    
    
    
  
  
  

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• FILETIME
  
  
  • Introduction
    It shows elapsed time from 00:00:00 on Jan 1, 1601. It is expressed per 100 nano-seconds.
    conversion fomula from FILETIME to time_t is
    ( FILETIME - 0x19DB1DED53E8000 ) / 10000000;
    
    
    
  • Recordable range
    from : 00:00:00 on Jan 1, 01601 ( 00000000 : 00000000 )
    to : 14:36:10 on Mar 28, 60056 ( FFFFFFFF : FFFFFFFF )
    
    
    
  
  
  
  

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• About character code
  
  
  • Introduction
    In Japan, all strings use shift_jis which is Japanese character code.