A. Header Formats
     (integers are little-endian; i.e. low-order bytes come first)

-----------------------------------------------------------------------------
        level-0                 level-1                 level-2              
-----------------------------------------------------------------------------
      1 header size           1 header size           2 total header size    
      1 header sum            1 header sum                                   
      5 method ID             5 method ID             5 method ID            
B     4 packed size           4 skip size             4 packed size          
      4 original size         4 original size         4 original size        
A     2 time (MS-DOS)         2 time (MS-DOS)         4 time (UNIX style)    
      2 date (MS-DOS)         2 date (MS-DOS)                                
S     1 MS-DOS attribute      1 fixed (0x20)          1 reserved (now 0x20)  
      1 level (0x00)          1 level (0x01)          1 level (0x02)         
I     1 name length           1 name length                                  
      ? pathname              ? filename                                     
C     2 file crc              2 file crc              2 file crc             
      . ........              1 OS ID ('M')           1 OS ID ('M')          
                              . ........                                     
                              2 next header size      2 next header size     
    *************************************************************************
     24 + ?                  27 + ?                  26                      
-----------------------------------------------------------------------------
EX-                           1 ext-type              1 ext-type             
TEN-                          . ........              . ........             
SION                          2 next-header size      2 next-header size     
-----------------------------------------------------------------------------

    �@Level-0 header:
      Same as LHarc and LArc.  Directory delimiter character is '\'.

    �@Level-1 header:
      Default.

    �@Level-2 header:
      Future versions will use this header.

    b. Method IDs

      -lh0-   no compression

      -lh1-   4k sliding dictionary(max 60 bytes) + dynamic Huffman
              + fixed encoding of position

      -lh2-   8k sliding dictionary(max 256 bytes) + dynamic Huffman

      -lh3-   8k sliding dictionary(max 256 bytes) + static Huffman

      -lh4-   4k sliding dictionary(max 256 bytes) + static Huffman
              + improved encoding of position and trees

      -lh5-   8k sliding dictionary(max 256 bytes) + static Huffman
              + improved encoding of position and trees

      -lzs-   2k sliding dictionary(max 17 bytes)

      -lz4-   no compression

      -lz5-   4k sliding dictionary(max 17 bytes)

    c. OS ID

        MS-DOS  'M'
        OS/2    '2'
        OS9     '9'
        OS/68K  'K'
        OS/386  '3'
        HUMAN   'H'
        UNIX    'U'
        CP/M    'C'
        FLEX    'F'
        Mac     'm'
        Runser  'R'

  B. Extension

    a. OS independent (0x00 - 0x3f)

        common header           
         1 0x00                 
         2 header crc           
       ( 1 information )        
         2 next-header size     
                                
        filename header         
         1 0x01                 
         ? filename             
         2 next-header size     
                                
        dirname header          
         1 0x02                 
         ? dirname (separated and terminated by 0xff)
         2 next-header size     
                                
        comment header (not yet supperted)
         1 0x3f                 
         ? comments             
         2 next-header size     
                                
    b. MS-DOS dependent (0x40 - 0x7f)

        attribute header        
         1 0x40                 
         2 file attribute       
         2 next-header size     

Note: Archived files are no longer sorted alphabetically.