ASCII85
application/octet-stream
Magic Bytes
Offset: 0
24 18 BE FF E3 00 03 00 FE FF 09 00 06
ASCII85, also known as Base85, is a binary-to-text encoding scheme originally developed by Adobe Systems for efficient data representation. It is primarily utilized within PostScript and Portable Document Format (PDF) files to embed binary objects such as images and font programs into text-based streams. Although the encoding format is inherently benign, it functions as a container for arbitrary payloads; consequently, decoded content should be vetted for malicious code according to standard security practices.
Validation Code
How to validate .b85 files in Python
Python
def is_b85(file_path: str) -> bool:
"""Check if file is a valid B85 by magic bytes."""
signature = bytes([0x24, 0x18, 0xBE, 0xFF, 0xE3, 0x00, 0x03, 0x00, 0xFE, 0xFF, 0x09, 0x00, 0x06])
with open(file_path, "rb") as f:
return f.read(13) == signatureHow to validate .b85 files in Node.js
Node.js
function isB85(buffer: Buffer): boolean {
const signature = Buffer.from([0x24, 0x18, 0xBE, 0xFF, 0xE3, 0x00, 0x03, 0x00, 0xFE, 0xFF, 0x09, 0x00, 0x06]);
return buffer.subarray(0, 13).equals(signature);
}
Go
func IsB85(data []byte) bool {
signature := []byte{0x24, 0x18, 0xBE, 0xFF, 0xE3, 0x00, 0x03, 0x00, 0xFE, 0xFF, 0x09, 0x00, 0x06}
if len(data) < 13 {
return false
}
return bytes.Equal(data[:13], signature)
}API Endpoint
GET
/api/v1/b85
curl https://filesignature.org/api/v1/b85