List of extended header

• List of extended header
  

  category	extended header identifier	caption	description
  C O M M O N	0x00	Common header	CRC of whole header, etc.
  	0x01	Filename header	Filename of compressed file.
  	0x02	Directory name header	Directory name of compressed file.
  	0x03 - 0x38	Reserved	These identifiers are not yet used.
  	0x39	Multi-disc header	Infomation for dividing the compressed file.
  	0x3A - 0x3E	Reserved	These identifiers are not yet used.
  	0x3F	Comment header	Comment of compressed file.
  f o r M S D O S	0x40	MS-DOS file attribute header	File attribute of MS-DOS format.
  	0x41	Windows time stamp header	Last access time and creation time and last modified time of compressed file in FILETIME format of Windows.
  	0x42	File size header	Original size and compressed size, when byte count of file exceeds 4,294,967,296bytes.
  	0x43 - 0x47	Reserved	These identifiers are not yet used.
  	0x48 - 0x4F	Resurved	According to http://www.osirusoft.com/joejared/lzhformat.html, these identifiers reserved for authenticity verification.
  f o r U N I X	0x50	Permission header	Permission of the file of UNIX.
  	0x51	UID GID header	User ID and group ID of compressed file.
  	0x52	Group name header	Group name of the compressed file.
  	0x53	User name header	Name of the owner of the compressed file.
  	0x54	UNIX time stamp header	Last modified time in time_t format.
  	0x55 - 0x5F	Reserved	These identifiers are not yet used.
  O T H E R	0x60 - 0x7C	Reserved	These identifiers are not yet used.
  	0x7D	Capsule header	Position and size of the file data in whole data which formed a format. like the MacBinary(operating system dependent data is attached on before and behind file data)
  	0x7E	Extended attribute header	Extended attribute of OS/2.
  	0x7F	New attribute header for Level 3 header(1)	Information about the file in Unix form and MS-DOS form.
  R E S E R V E D	0x80 - 0xC3	Reserved	These identifiers are not yet used.
  	0xC4 - 0xC8	Compressed comment header	According to http://www.osirusoft.com/joejared/lzhformat.html, these identifiers are reserved to store a compressed comment.
  	0xC9 - 0xFE	Reserved	These identifiers are not yet used.
  	0xFF	New attribute header for Level 3 header(2)	Information about the file in Unix form.

  
  
  
• About category
  
  In header.tex which is attached to LHA for OS/2, identifiers are categorised,
  ...0x00-0x3F is categorised as "common",
  ...0x40-0x7F is categorised as "OS dependent",
  ...0x80-0xFF is categorised as "Reserved".
  I categorised this still more minutely,
  ...0x00-0x3F is categorised as "common",
  ...0x40-0x4F is categorised as "for MS-DOS",
  ...0x50-0x5F is categorised as "for UNIX",
  ...0x60-0x7F is categorised as "other",
  ...0x80-0xFF is categorised as "Reserved".
  However, all people do not follow this categorisation. For example, file size header and compressed comment header does not follow this categorisation.

  
  
• Reference
  • Joe Jared's LZH format
    http://www.osirusoft.com/joejared/lzhformat.html
    
    
  • Eriko Tachibana's document of LHA header(japanese)
    http://kuwa.omosiro.com/KGARC2/ARC/LHAHED15.ZIP
    
    
  • Satoshi Hiramatsu's header.tex which is attached to LHA for OS/2(japanese)
    http://www02.so-net.ne.jp/~hiramatu/lha/lha2-2.08.lzh
    
    
  • Micco's header.txt which is attached to UNLHA32.DLL(japanese)
    http://www2.nsknet.or.jp/~micco/unlha32.htm