Difference between revisions of "ARC"

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(Created page with "Category:File formats This page documents the format of ARC. == Overview == ARC files are archives. Containers of files compressed with LZ-10 (more compression methods migh...")
 
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|  0x00C || 4 || uint32 || File's length
 
|  0x00C || 4 || uint32 || File's length
 
|-
 
|-
|  0x010 || 4 || uint32 || File table offset (from the beginning of the file)
+
|  0x010 || 4 || uint32 || [[ARC#File_table|File table]] offset (from the beginning of the file)
 
|-
 
|-
|  0x014 || 4 || uint32 || file table length
+
|  0x014 || 4 || uint32 || [[ARC#File_table|File table]] length
 
|-
 
|-
|  0x018 || 4 || uint32 || files data offset
+
|  0x018 || 4 || uint32 || [[ARC#Files_data|File table]] offset
 
|}
 
|}
  
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   * First two nodes in the file table are ‘null’ and ‘.’ both have compressed file length of 7.
 
   * First two nodes in the file table are ‘null’ and ‘.’ both have compressed file length of 7.
  
=== File Data ===
+
=== Files Data ===
  
 
   * Each file is compressed using LZ-10. (Starts with 0x10 and followed by uint24 of the uncompressed file size).
 
   * 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.
 
   * Each file's end is padded to 0x10 besides the last one which ends with EOF.

Revision as of 20:20, 29 November 2012

This page documents the format of ARC.

Overview

ARC files are archives. Containers of files compressed with LZ-10 (more compression methods might be available).

This is very similiar to NARC (the DS archives).

ARC header

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 File table offset (from the beginning of the file)
0x014 4 uint32 File table length
0x018 4 uint32 File table offset

File table

The file table starts at 0x01C.

Each file struct consists of 3 uint32:

Offset Size Type Description
0x00C 4 uint32 Compressed file name offset (from the end of the table, padded to 0x10)

if (MSB is high) 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.