JIF
image/jpeg
Magic Bytes
Offset: 0
FF D8 FF
JPEG Interchange Format (JIF) is a raster graphics file format originally defined by the Joint Photographic Experts Group to implement ISO 10918-1 compression standards. It functions as a simplified container for digital images, primarily utilizing lossy compression to reduce file size for storage and transmission. However, the format is now considered legacy and effectively obsolete, having been replaced by JFIF and Exif structures which correct significant omissions regarding color space and pixel aspect ratio.
Validation Code
How to validate .jif files in Python
Python
def is_jif(file_path: str) -> bool:
"""Check if file is a valid JIF by magic bytes."""
signature = bytes([0xFF, 0xD8, 0xFF])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .jif files in Node.js
Node.js
function isJIF(buffer: Buffer): boolean {
const signature = Buffer.from([0xFF, 0xD8, 0xFF]);
return buffer.subarray(0, 3).equals(signature);
}
Go
func IsJIF(data []byte) bool {
signature := []byte{0xFF, 0xD8, 0xFF}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
GET
/api/v1/jif
curl https://filesignature.org/api/v1/jif