OAR
application/octet-stream
Magic Bytes
Offset: 0
4F 41 52
OpenSimulator Archive (OAR) is a standardized packaging format developed by the OpenSimulator project for the archival and transport of virtual world environments. It is primarily used to back up entire simulator regions, including terrain data, primitive objects, inventory assets, and region-specific settings. As a compressed archive, it is generally considered safe for storage, though users should verify the origin of archives to prevent the execution of malicious scripts upon region restoration.
Validation Code
How to validate .oar files in Python
Python
def is_oar(file_path: str) -> bool:
"""Check if file is a valid OAR by magic bytes."""
signature = bytes([0x4F, 0x41, 0x52])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .oar files in Node.js
Node.js
function isOAR(buffer: Buffer): boolean {
const signature = Buffer.from([0x4F, 0x41, 0x52]);
return buffer.subarray(0, 3).equals(signature);
}
Go
func IsOAR(data []byte) bool {
signature := []byte{0x4F, 0x41, 0x52}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
GET
/api/v1/oar
curl https://filesignature.org/api/v1/oar