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IonFx Miasmata RS5 file format
The RS5 file format is a ZLib-compressed Tagged file format created by Joe Johnson of IonFx for the addictive survival game Miasmata.
Note that fixed-size fields containing variable-size data (such as the name fields in the central directory) will have garbage after the end of the variable-size data.
All data in the file is stored in little-endian order.
Types are expressed as DotNet types:
-
byte: unsigned 8-bit integer -
short: signed 16-bit integer -
int: signed 32-bit integer -
long: signed 64-bit integer -
float: 32-bit floating-point -
ASCIZ: Null-terminated 8-bit ASCII string - note that the space after the string in a field is not zeroed, and may contain garbage. -
FILETIME: 64-bit Win32 FILETIME value -
ARGB: 8-bit Alpha, Red, Green and Blue values (32bpp)
The file starts with a 24 byte header pointing to the central directory.
| Offset | Size | Type | Meaning |
|---|---|---|---|
| 0x0000 | 8 | byte[] |
Magic value CFILEHDR
|
| 0x0008 | 8 | long |
Absolute offset of central directory within file |
| 0x0010 | 4 | int |
Size of each entry in central directory |
| 0x0014 | 4 | int |
Unknown |
The central directory consists of one or more consecutive directory entries, each pointing to either nothing (offset = length = 0) or a tagged information object. The first entry is always a pointer to the central directory itself. Each directory entry appears to always be 168 bytes long.
| Offset | Size | Type | Meaning |
|---|---|---|---|
| 0x0000 | 8 | long |
Absolute offset of object within file |
| 0x0008 | 4 | int |
Compressed length of object |
| 0x000C | 4 | ??? | Unknown - seems to always be 0x80000000 for present entries |
| 0x0010 | 4 | ??? | Unknown - seems to always be 0x00000300 for present entries |
| 0x0014 | 4 | byte[] |
FourCC - identifies type of object |
| 0x0018 | 8 | ??? | Unknown - appears to be about twice the size of the uncompressed data |
| 0x0020 | 8 | FILETIME |
Appears to be the modification time of the object |
| 0x0028 | 128 | ASCIZ |
Null-terminated name of object |
Each object is compressed using the RFC1950 Zlib compression format. Each object is wrapped in a tagged chunk and can contain either data or one or more tagged chunks. All chunks within the compressed objects are aligned to 8 bytes. The chunk size in the chunk header does not include this alignment padding.
| Offset | Size | Type | Meaning |
|---|---|---|---|
| 0x0000 | 4 | byte[] |
FourCC - identifies type of chunk |
| 0x0004 | 2 | ??? | Unknown - always appears to be zero |
| 0x0006 | 1 | byte |
Length of name including terminating zero |
| 0x0007 | 1 | byte |
zero if the chunk contains data; 1 if the chunk either contains no data or contains tagged chunks. |
| 0x0008 | 4 | int |
Size of the chunk |
| 0x000c | variable | ASCIZ |
Null-terminated name of chunk |
| align(8) | variable | Chunk data or tagged chunks |
Object types are identified by a few tags. Anything that doesn't fit in these tags (such as terrain height maps) is tagged as RAW..
Object types:
- [
AMDL](AMDL (Animated Model)) Animated Model - [
IMDL](IMDL (Immobile Model)) Immobile Model - [
IMAG](IMAG (Image)) Image - [
IIMP](IIMP (Image-based Imposter)) Image-based Imposter - [
MSET](MSET (Model Set)) Model Set - [
SAMP](SAMP (Sound Sample)) Sound Sample - [
PROF](PROF (Shader Profile)) Shader Profile - [
CONF](CONF (Shader Configuration)) Shader Configuration - [
INOD](INOD (Instance Node)) Instance Node - [
CNOD](CNOD (Cartography Node)) Cartography Node - [
FOGN](FOGN (Fog Noise Map)) Fog Noise Map - [
RAW.](RAW. (Raw Data)) Raw Data
Special objects:
- [
environment](Environment settings)