MF
text/plain
Magic Bytes
Offset: 0
54 68 69 73 20 69 73 20 54 65 58 2C
METAFONT is a programmatic font description language developed by Donald Knuth to create typefaces for the TeX typesetting system. These plain text files define character shapes using geometric equations and algebraic constraints rather than static outlines, allowing for adaptable font generation. While largely replaced by modern vector standards like OpenType, this legacy format remains significant in academic typography and poses no security risks, as the files function purely as rendering instructions within a text-based container.
Validation Code
How to validate .mf files in Python
Python
def is_mf(file_path: str) -> bool:
"""Check if file is a valid MF by magic bytes."""
signature = bytes([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C])
with open(file_path, "rb") as f:
return f.read(12) == signatureHow to validate .mf files in Node.js
Node.js
function isMF(buffer: Buffer): boolean {
const signature = Buffer.from([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C]);
return buffer.subarray(0, 12).equals(signature);
}
Go
func IsMF(data []byte) bool {
signature := []byte{0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C}
if len(data) < 12 {
return false
}
return bytes.Equal(data[:12], signature)
}API Endpoint
GET
/api/v1/mf
curl https://filesignature.org/api/v1/mf