GFA (File Format)
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GFA (Good-Feel Archive) is an archive format developed by Good-Feel and used in some Nintendo 3DS games and software such as StreetPass Mii Plaza.
File Format
The file byte order is always little endian.
Header
Every GFA file begins with a 0x2C byte header structure.
Offset | Type | Description |
---|---|---|
0x00 | Char[4] | File magic. Always GFAC in ASCII. |
0x04 | UInt32 | Version number. |
0x08 | UInt32 | Unknown. Always 1. |
0x0C | UInt32 | File Allocation Table offset. |
0x10 | UInt32 | Size of File Allocation Table in bytes. |
0x14 | UInt32 | GFCP offset. |
0x18 | UInt32 | Size of GFCP in bytes. |
0x1C | Byte[16] | Padding. |
File Allocation Table
The Header is immediately followed by a File Allocation Table. It has the following structure:
Offset | Type | Description |
---|---|---|
0x00 | Int32 | Number of nodes. |
Node
Followed by the number of nodes comes all node entries. Each entry has the following structure:
Offset | Type | Description |
---|---|---|
0x00 | UInt32 | File Hash. |
0x04 | UInt24 | File name offset. |
0x07 | Byte | Unknown. Sometimes seen as 0x80. |
0x08 | UInt32 | Size of the uncompressed file in bytes. |
0x0C | UInt32 | Uncompressed file offset, starting at the GFCP offset. |
GFCP
The GFCP section contains file data. Its header has the following structure:
Offset | Type | Description |
---|---|---|
0x00 | Char[4] | File magic. Always GFCP in ASCII. |
0x04 | UInt32 | Unknown. Always 1. |
0x08 | Int32 | Compression type:
|
0x0C | UInt32 | Uncompressed size. |
0x10 | UInt32 | Compressed size. |
After follows 4-byte aligned null-terminated strings that represent the filenames of the packed files.
File Data
The compressed data begins just after the the GFCP header.
Version List
Version | Found in |
---|---|
0.0.3.1 |
Tools
The following tools can handle GFA files:
- (none)