HPAPP
application/octet-stream
Magic Bytes
Offset: 0
7C 61 8A B2
The HPAPP file format is a proprietary firmware update container developed by HP Inc. for use with their modern printers and multifunction devices. It serves as an encapsulation method for delivering system software upgrades, security patches, and functional enhancements to hardware components. Although classified as safe for general storage, these binary files modify device operations at a low level and should ideally be verified against official manufacturer checksums before installation.
Validation Code
How to validate .hpapp files in Python
Python
def is_hpapp(file_path: str) -> bool:
"""Check if file is a valid HPAPP by magic bytes."""
signature = bytes([0x7C, 0x61, 0x8A, 0xB2])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .hpapp files in Node.js
Node.js
function isHPAPP(buffer: Buffer): boolean {
const signature = Buffer.from([0x7C, 0x61, 0x8A, 0xB2]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsHPAPP(data []byte) bool {
signature := []byte{0x7C, 0x61, 0x8A, 0xB2}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/hpapp
curl https://filesignature.org/api/v1/hpapp