BCSV, known as Binary CSV, stores information relating to general content in a compact CSV format
Contents
General
All information in this document is from Animal Crossing: New Horizons
BCSV files contain a header which defines the number of entries, the size of each entry block, and the fields each entry has, followed by a number of entries with context-specific data
Header
The header contains
Offset | Size | Description |
---|---|---|
0x00 | 0x4 | Entry count |
0x04 | 0x4 | Entry size |
0x08 | 0x2 | Field count |
0x0A | 0x2 | Always 0x0101 |
0x0C | 0x4 | VSCB Magic |
0x10 | 0x2 | Always 0x1027 |
0x12 | 0xA | Padding |
0x1C | 0x8*Field count | Fields |
Fields
The fields are defined in the header as 2 sections; a data identifier and the relative offset in each entry
Offset | Size | Description |
---|---|---|
0x00 | 0x4 | Data identifier |
0x04 | 0x4 | Offset |
The data identifier determines what type of data the offset is pointing to. The meaning behind each identifier seems to rely on the context of the files content, generally, with only a small number of identifiers being reused in multiple files. In AC:NH there is a total 2048 unique identifiers, with only 191 being reused in multiple files. For a list of all identifiers in AC:NH and the files they are used in, see here https://pastebin.com/KnbnD1r8
Entries
Entries always begin with their offset relative to the file start, and then contain the blocks data. Nearly every file seems to contain a field with type `0x54607054`, which is always a unique int16 for each entry, though the location of this field is not always the same
Offset | Size | Description |
---|---|---|
0x00 | 0x4 | Offset relative to file start |
0x04 | Entry data |