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/* header.doc (In Japanese) */
LHa for UNIX ǻѤإå¤ˤĤ Mar. 2, 1992, Masaru Oki.
----------------------------------------------------------------
ܥСǤϲŪ֤Ȥ3ΥإåѰդlevel-1
ͤȤƤޤŪˤϥѥ̾ʸ¤Τʤ level-2
줹ˤǤ
A. إåλ
-----------------------------------------------------------------------------
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
4 packed size 4 skip size 4 packed size
4 original size 4 original size 4 original size
2 time 2 time 4 time(UNIX type)
2 date 2 date
1 attribute 1 0x20 1 RESERVED
1 level 0x00 1 level 0x01 1 level 0x02
ʬ 1 name length 1 name length
? pathname ? filename
2 file crc 2 file crc 2 file crc
. ........ 1 OS ID 'U' 1 OS ID 'U'
. ........
2 next-header size 2 next-header size
*************************************************************************
24 + ? 27 + ? 26
-----------------------------------------------------------------------------
1 ext-type 1 ext-type
ĥ . ........ . ........
2 next-header size 2 next-header size
ʬ
-----------------------------------------------------------------------------
a. إåμ
level-0 إå
LHarc, LArc ƱǤǥ쥯ȥ̾ζڤ '\'
ɸȤƤޤ
level-1 إå
ͤǤΥإåޤ-x0 Ǻ줿 -lh0- ν
LHarc DzǽǤ CRC åϹԤޤ
level-2 إå
Ĺե̾ݡȤ뤿ΥإåǤŪˤܥإ
ɸȤΤǡLH ϢΥ桼ƥƥϺ
Ƥ褦ˤꤤޤ
b. 롦ǽ method ID ˤĤ
* Ϻǽ method
-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
-lh6- 32k 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 ˤĤ
ߤΤȤʲ ID ͽƤޤ
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. ĥʬ
a. OS ¸ (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
2 next-header size
comment header
1 0x3f
? comments
2 next-header size
(ʾ塢Ⱥ lhx.doc )
----------------------------------------------------------------
LHa for UNIX ĥإå
¸μ(Ǽ٤)
UNIX ˰¸ǵϿ٤ϰʲΤΤǤ롣
(1) ѡߥå
(2) GID,UID
(3) 롼̾桼̾
(4) ǽѹ(UNIX time)
¸Υ(ext-type)
ĥإåƬ1ХȤˤϾ
̤뤿ͤǼƤ롣
UNIX¸Ȥ 0x50 - 0x54 Ѥ롣
¸γǼˡ
嵭 (1) - (4) 줾̤ΥפȤ롣
(1)ѡߥå
size
1 0x50
2 ѡߥå
2 next-header size
(2)GID,UID
size
1 0x51
2 GID
2 UID
2 next-header size
(3)-1 롼̾
1 0x52
? 롼̾ʸ
2 next-header size
(3)-2 桼̾
1 0x53
? 桼̾ʸ
2 next-header size
(4) ǽѹ (for header_level1)
1 0x54
4 UNIX
2 next-header size
LHa for UNIX ver 1.14 Ǥμʺ
嵭(3)ݡȤƤʤ
(3)Υ롼̾桼̾ξޤˤ뤳
ϤʤŸˤ̵뤹롣
ޤ(4)ϥإå٥1νˤˤΤߴޤޤ롣
----------------------------------------------------------------
ʾ塣
ѡ
ʺꡡδ (Nobutaka Watazaki)
watazaki@shimadzu.co.jp
|
