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BYAML File Format
Yannik Marchand edited this page Jun 18, 2021
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These files are similar to regular YAML files, but are encoded in binary form. They usually have the file extension .byml or .byaml.
This page describes version 1 of the file format.
Offsets in the header are absolute.
| Offset | Size | Description |
|---|---|---|
| 0x0 | 2 | Magic number / BOM (BY: big endian, YB: little endian) |
| 0x2 | 2 | Version number |
| 0x4 | 4 | Offset to string table 1 |
| 0x8 | 4 | Offset to string table 2 |
| 0xC | 4 | Unknown |
| 0x10 | 4 | Offset to root node |
A node starts with a single byte that indicates its type.
| ID | Type |
|---|---|
| 0xC0 | Array |
| 0xC1 | Hash |
| 0xC2 | String table |
A string table is a special kind of node.
The address table contains offsets to the strings, relative to the start of the string table node. It also contains an offset that points to the end of the string table (right behind the last string).
The address table and strings must both be sorted, because a binary search algorithm is used to find them.
| Offset | Size | Description |
|---|---|---|
| 0x0 | 1 | Node type (0xC2) |
| 0x1 | 3 | Number of strings (N) |
| 0x4 | 4 x (N + 1) | Address table |
| Null-terminated strings |