CMUS (.cmus)
.cmus file signature | application/octet-stream
IFFMusical Score
Magic Bytes
Offset 0
46 4F 52 4D 43 4D 55 53
Sources: Wikipedia
Extension
.cmus
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .cmus files in Python
def is_cmus(file_path: str) -> bool:
"""Check if file is a valid CMUS by magic bytes."""
signature = bytes([0x46, 0x4F, 0x52, 0x4D, 0x43, 0x4D, 0x55, 0x53])
with open(file_path, "rb") as f:
return f.read(8) == signatureHow to validate .cmus files in Node.js
function isCMUS(buffer: Buffer): boolean {
const signature = Buffer.from([0x46, 0x4F, 0x52, 0x4D, 0x43, 0x4D, 0x55, 0x53]);
return buffer.subarray(0, 8).equals(signature);
}How to validate .cmus files in Go
func IsCMUS(data []byte) bool {
signature := []byte{0x46, 0x4F, 0x52, 0x4D, 0x43, 0x4D, 0x55, 0x53}
if len(data) < 8 {
return false
}
return bytes.Equal(data[:8], signature)
}API Endpoint
/api/v1/cmus
curl https://filesignature.org/api/v1/cmus
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .cmus file?
A .cmus file is a CMUS file. IFFMusical Score
What are the magic bytes for .cmus files?
The magic bytes for CMUS files are 46 4F 52 4D 43 4D 55 53 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .cmus file?
To validate a .cmus file, read the first bytes of the file and compare them against the known magic bytes (46 4F 52 4D 43 4D 55 53) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .cmus files?
There is no officially registered MIME type for .cmus files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .cmus files?
CMUS (.cmus) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.