XBM
image/x-xbitmap
Magic Bytes
Offset: 0
2F 2A 20 58 50 4D
The X BitMap (XBM) is a legacy monochrome image format originally developed for the X Window System by the MIT X Consortium. It was primarily used for storing small icons, cursors, and user interface elements as C language source code that could be compiled directly into applications. Although largely obsolete and replaced by more modern formats like PNG, XBM remains a secure format because its plain-text structure lacks support for executable macros or complex metadata.
Validation Code
How to validate .xbm files in Python
Python
def is_xbm(file_path: str) -> bool:
"""Check if file is a valid XBM by magic bytes."""
signature = bytes([0x2F, 0x2A, 0x20, 0x58, 0x50, 0x4D])
with open(file_path, "rb") as f:
return f.read(6) == signatureHow to validate .xbm files in Node.js
Node.js
function isXBM(buffer: Buffer): boolean {
const signature = Buffer.from([0x2F, 0x2A, 0x20, 0x58, 0x50, 0x4D]);
return buffer.subarray(0, 6).equals(signature);
}
Go
func IsXBM(data []byte) bool {
signature := []byte{0x2F, 0x2A, 0x20, 0x58, 0x50, 0x4D}
if len(data) < 6 {
return false
}
return bytes.Equal(data[:6], signature)
}API Endpoint
GET
/api/v1/xbm
curl https://filesignature.org/api/v1/xbm