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| == Overview == | | == Overview == |
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| ARC files are archives. Containers of files compressed with LZ-10 (more compression methods might be available). | | ARC files are compressed files. |
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| This is very similiar to NARC (the DS archives).
| | Found in [[BCMA|manual files] compressed with LZ-10 |
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| == ARC header ==
| | (more compression methods might be available). |
| {| class="wikitable" border="1"
| |
| ! Offset !! Size !! Type !! Description
| |
| |-
| |
| | 0x000 || 4 || char[4] || Magic Number 'darc'
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| |-
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| | 0x004 || 2 || uint16 || Endianess (=0xFFFE: Little)
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| |-
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| | 0x006 || 2 || uint16 || Header's length
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| |-
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| | 0x008 || 4 || uint32 || Unknown (= 0x01000000 ?)
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| |-
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| | 0x00C || 4 || uint32 || File's length
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| |-
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| | 0x010 || 4 || uint32 || [[ARC#File_table|File table]] offset (from the beginning of the file)
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| |-
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| | 0x014 || 4 || uint32 || [[ARC#File_table|File table]] length
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| |-
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| | 0x018 || 4 || uint32 || [[ARC#Files_data|Files data]] offset
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| |}
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| | |
| === File table ===
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| | |
| The file table starts at 0x01C.
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| Each file struct consists of 3 uint32:
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| {| class="wikitable" border="1"
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| ! Offset !! Size !! Type !! Description
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| |-
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| | 0x00C || 4 || uint32 || Compressed file name offset (from the end of the table, padded to 0x10)
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| | |
| if (offset & 0x01000000) then this is a folder (i.e. first two nodes 'null' & '.')
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| |-
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| | 0x004 || 4 || uint32 || Compressed file offset
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| |-
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| | 0x008 || 4 || uint32 || Compressed file length
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| |}
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| | |
| * First two nodes in the file table are ‘null’ and ‘.’ both have compressed file length of 7.
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| === Files data ===
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| | |
| * Each file is compressed using LZ-10. (Starts with 0x10 and followed by uint24 of the uncompressed file size).
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| * Each file's end is padded to 0x10 besides the last one which ends with EOF.
| |
Revision as of 22:12, 29 November 2012
This page documents the format of ARC.
Overview
ARC files are compressed files.
Found in [[BCMA|manual files] compressed with LZ-10
(more compression methods might be available).