NetCDF
application/octet-stream
Magic Bytes
Offset: 0
6F 3C
The Network Common Data Form Language (CDL) is a text-based representation of NetCDF data structures maintained by the Unidata Program Center at UCAR. It is primarily used to define and describe the metadata, dimensions, variables, and attributes of multi-dimensional scientific datasets in a human-readable ASCII format. As a plain-text declaration format typically processed by command-line utilities to generate binary NetCDF files, CDL is considered safe and carries no inherent security risks.
Validation Code
How to validate .cdl files in Python
Python
def is_cdl(file_path: str) -> bool:
"""Check if file is a valid CDL by magic bytes."""
signature = bytes([0x6F, 0x3C])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .cdl files in Node.js
Node.js
function isCDL(buffer: Buffer): boolean {
const signature = Buffer.from([0x6F, 0x3C]);
return buffer.subarray(0, 2).equals(signature);
}
Go
func IsCDL(data []byte) bool {
signature := []byte{0x6F, 0x3C}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
GET
/api/v1/cdl
curl https://filesignature.org/api/v1/cdl