AC
text/plain
Magic Bytes
Offset: 0
54 68 69 73 20 69 73 20 54 65 58 2C
The AC file format is a macro-based configuration script created and maintained by the GNU Project as part of the Autoconf build system. It is primarily used to generate portable shell scripts that automate software configuration and compilation processes across diverse Unix-like operating systems. Although these plain text files are inherently safe to inspect, they orchestrate the execution of system-level commands during builds, necessitating verification of source authenticity to ensure development environment security.
Validation Code
How to validate .ac files in Python
Python
def is_ac(file_path: str) -> bool:
"""Check if file is a valid AC by magic bytes."""
signature = bytes([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C])
with open(file_path, "rb") as f:
return f.read(12) == signatureHow to validate .ac files in Node.js
Node.js
function isAC(buffer: Buffer): boolean {
const signature = Buffer.from([0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C]);
return buffer.subarray(0, 12).equals(signature);
}
Go
func IsAC(data []byte) bool {
signature := []byte{0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x54, 0x65, 0x58, 0x2C}
if len(data) < 12 {
return false
}
return bytes.Equal(data[:12], signature)
}API Endpoint
GET
/api/v1/ac
curl https://filesignature.org/api/v1/ac