XML User Interface Language file
application/octet-stream
Magic Bytes
Offset: 0
3C 3F 78 6D 6C 20 76 65 72 73 69 6F 6E 3D 22 31 2E 30 22 3F 3E 0D 0A 3C 4D 4D 43 5F 43 6F 6E 73 6F 6C 65 46 69 6C 65 20 43 6F 6E 73 6F 6C 65 56 65 72 73 69 6F 6E 3D 22
XML User Interface Language (XUL) is a markup language format developed by the Mozilla project to define cross-platform graphical user interfaces. It was primarily utilized in the development of the Firefox browser and Thunderbird email client to maintain consistent application layout across different operating systems. As modern browsers transitioned toward standardized web technologies, XUL became a legacy format and has been largely deprecated in favor of HTML5 and CSS.
Validation Code
How to validate .xul files in Python
Python
def is_xul(file_path: str) -> bool:
"""Check if file is a valid XUL by magic bytes."""
signature = bytes([0x3C, 0x3F, 0x78, 0x6D, 0x6C, 0x20, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, 0x22, 0x31, 0x2E, 0x30, 0x22, 0x3F, 0x3E, 0x0D, 0x0A, 0x3C, 0x4D, 0x4D, 0x43, 0x5F, 0x43, 0x6F, 0x6E, 0x73, 0x6F, 0x6C, 0x65, 0x46, 0x69, 0x6C, 0x65, 0x20, 0x43, 0x6F, 0x6E, 0x73, 0x6F, 0x6C, 0x65, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, 0x22])
with open(file_path, "rb") as f:
return f.read(56) == signatureHow to validate .xul files in Node.js
Node.js
function isXUL(buffer: Buffer): boolean {
const signature = Buffer.from([0x3C, 0x3F, 0x78, 0x6D, 0x6C, 0x20, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, 0x22, 0x31, 0x2E, 0x30, 0x22, 0x3F, 0x3E, 0x0D, 0x0A, 0x3C, 0x4D, 0x4D, 0x43, 0x5F, 0x43, 0x6F, 0x6E, 0x73, 0x6F, 0x6C, 0x65, 0x46, 0x69, 0x6C, 0x65, 0x20, 0x43, 0x6F, 0x6E, 0x73, 0x6F, 0x6C, 0x65, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, 0x22]);
return buffer.subarray(0, 56).equals(signature);
}
Go
func IsXUL(data []byte) bool {
signature := []byte{0x3C, 0x3F, 0x78, 0x6D, 0x6C, 0x20, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, 0x22, 0x31, 0x2E, 0x30, 0x22, 0x3F, 0x3E, 0x0D, 0x0A, 0x3C, 0x4D, 0x4D, 0x43, 0x5F, 0x43, 0x6F, 0x6E, 0x73, 0x6F, 0x6C, 0x65, 0x46, 0x69, 0x6C, 0x65, 0x20, 0x43, 0x6F, 0x6E, 0x73, 0x6F, 0x6C, 0x65, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6F, 0x6E, 0x3D, 0x22}
if len(data) < 56 {
return false
}
return bytes.Equal(data[:56], signature)
}API Endpoint
GET
/api/v1/xul
curl https://filesignature.org/api/v1/xul