ARC
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 | Files data 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.