NII
application/octet-stream
Magic Bytes
Offset: 344
6E 2B 31 00
The Neuroimaging Informatics Technology Initiative (NIfTI) format is a standardized file type developed by the National Institutes of Health to improve medical imaging data exchange. It is primarily utilized in neurological research and clinical settings to store multidimensional brain scan data produced by MRI and CT machines. Succeeding the older Analyze 7.5 format, NII files are generally considered safe as they store voxel data and metadata rather than executable scripts or active content.
Validation Code
How to validate .nii files in Python
Python
def is_nii(file_path: str) -> bool:
"""
Check if file is a valid NII by magic bytes.
Signature offset: 344 bytes
"""
signature = bytes([0x6E, 0x2B, 0x31, 0x00])
with open(file_path, "rb") as f:
f.seek(344)
return f.read(4) == signatureHow to validate .nii files in Node.js
Node.js
function isNII(buffer: Buffer): boolean {
// Signature offset: 344 bytes
const signature = Buffer.from([0x6E, 0x2B, 0x31, 0x00]);
if (buffer.length < 348) return false;
return buffer.subarray(344, 348).equals(signature);
}
Go
func IsNII(data []byte) bool {
// Signature offset: 344 bytes
signature := []byte{0x6E, 0x2B, 0x31, 0x00}
if len(data) < 348 {
return false
}
return bytes.Equal(data[344:348], signature)
}API Endpoint
GET
/api/v1/nii
curl https://filesignature.org/api/v1/nii