HPPRGM
application/octet-stream
Magic Bytes
Offset: 0
7C 61 8A B2
The HPPRGM format is a proprietary program container developed by Hewlett-Packard specifically for the HP Prime Graphing Calculator ecosystem. These files encapsulate custom scripts, functions, and applications written in the HP Prime Programming Language (HP PPL) to facilitate transfer between devices and computer connectivity software. As a specialized scripting container, the format presents minimal security risk to personal computers but enables code execution within the calculator's constrained operating environment.
Validation Code
How to validate .hpprgm files in Python
Python
def is_hpprgm(file_path: str) -> bool:
"""Check if file is a valid HPPRGM by magic bytes."""
signature = bytes([0x7C, 0x61, 0x8A, 0xB2])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .hpprgm files in Node.js
Node.js
function isHPPRGM(buffer: Buffer): boolean {
const signature = Buffer.from([0x7C, 0x61, 0x8A, 0xB2]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsHPPRGM(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/hpprgm
curl https://filesignature.org/api/v1/hpprgm