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