IN
text/plain
Magic Bytes
Offset: 0
54 68 69 73 20 69 73 20 54 65 58 2C
The IN file format represents a text-based input document associated with the TeX typesetting system, a standard developed by Donald Knuth for digital publishing. These files typically contain typesetting commands or configuration templates intended to be compiled into structured documents like academic papers or books. While the format is technically safe as plain text, it relies on specific TeX distributions for processing and has remained a staple in scientific documentation workflows.
Validation Code
How to validate .in files in Python
Python
def is_in(file_path: str) -> bool:
"""Check if file is a valid IN 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 .in files in Node.js
Node.js
function isIN(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 IsIN(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/in
curl https://filesignature.org/api/v1/in