FV
text/plain
Magic Bytes
Offset: 0
54 68 69 73 20 69 73 20 54 65 58 2C
The FV file format is a text-based data resource associated with the TeX typesetting system, originally developed by computer scientist Donald Knuth. It functions principally as a string pool or configuration component, containing internal error messages and text constants required by TeX processing engines during compilation. While the format is legacy in nature and identified by a distinctive ASCII header, it is inherently safe to view and involves no executable code or dynamic scripting risks.
Validation Code
How to validate .fv files in Python
Python
def is_fv(file_path: str) -> bool:
"""Check if file is a valid FV 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 .fv files in Node.js
Node.js
function isFV(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 IsFV(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/fv
curl https://filesignature.org/api/v1/fv