BFSAR (File Format)
A BFSAR file is an archive containing sound effects. In NSMBU, it also contains all music streams, but I don't think this is the case for MK8.
Format
I found this information by reverse engineering NSMBU and analyzing the bfsar files of NSMBU, SM3DW and Splatoon. I think the same applies to MK8, but since I don't have MK8's files, I can't assure this.
Header
| Offset | Size | Description |
|---|---|---|
| 0x00 | 4 | Magic ("FSAR") |
| 0x04 | 2 | Endianness. 0xFEFF is big endian, 0xFFFE is little endian |
| 0x06 | 2 | Header size? Always 0x0040 |
| 0x08 | 4 | Version number |
| 0x0C | 4 | File size of the entire file. |
| 0x10 | 2 | Section count? Always 0x03. |
| 0x12 | 2 | Unknown. Always 0. |
| 0x14 | 3 × 12 | Section info. 3 structures describing the offsets to and sizes of the bfsar sections. |
| 0x38 | 8 | Unknown. Always 0. |
Section information
| Offset | Size | Description |
|---|---|---|
| 0 | 2 | Identifier. Specifies which section it describes. 0x2000 is the STRG section, 0x2001 is INFO and 0x2002 is FILE. |
| 2 | 2 | Unknown. Always 0. |
| 4 | 4 | Offset |
| 8 | 4 | Size |
STRG Section
This section contains a string table and data about the string.
| Offset | Size | Description |
|---|---|---|
| 0x00 | 4 | ASCII identifier ("STRG") |
| 0x04 | 4 | Section size |
| 0x08 | 4 | Unknown. Always 0x24000000 |
| 0x0C | 4 | String table offset, relative to field 0x08 of the STRG section. |
| 0x10 | 4 | Unknown. Always 0x24010000 |
| 0x14 | 4 | Offset to lookup table. |
String table
The string table contains structures that point to null terminated strings. All offsets are relative to the start of the string table. It starts with a string count and then contains:
| Offset | Size | Description |
|---|---|---|
| 0 | 4 | Unknown. Always 0x1F010000. |
| 4 | 4 | Offset to null terminated string. |
| 8 | 4 | Unknown. |
Lookup table
This table is used to get the string table index and other data for a string. It starts with 8 bytes of data:
| Offset | Size | Description |
|---|---|---|
| 0 | 4 | Index of the table entry where it starts. |
| 4 | 4 | Unknown. Seems to be some kind of index too. Must be higher than the other index. |
And is then followed by 0x14 byte structures:
| Offset | Size | Description |
|---|---|---|
| 0x00 | 2 | Endpoint. 0 if this is an entry that links to another list entry. 1 if the string has been found and the entry contains data about it. |
| 0x02 | 2 | String bit. This bit in the string that's being searched for decides with which entry the search should continue. |
| 0x04 | 4 | This is the table index of the next entry if the string bit is 0. |
| 0x08 | 4 | This is the index of the next entry if the string bit is 1. |
| 0x0C | 4 | String table index if this structure is an endpoint. |
| 0x10 | 1 | Data about the file. 1 if it's an audio file (SE/WSD/STRM), 2 if it's a WSDSET or SEQSET, 3 is a BANK, 4=PLAYER and 6=GROUP. |
| 0x11 | 3 | File id |