DIFF
text/x-diff
Magic Bytes
Offset: 0
64 69 66 66 20
The DIFF file format is a line-oriented text representation of data differences originally created by Douglas McIlroy for the Unix operating system. It is primarily utilized in software development to facilitate code reviews, document version histories, and generate patch files for updating source code across distributed repositories. As plain text instructions for content modification, these files are generally considered safe, though users should audit specific changes for malicious code before applying them to a system.
Validation Code
How to validate .diff files in Python
Python
def is_diff(file_path: str) -> bool:
"""Check if file is a valid DIFF by magic bytes."""
signature = bytes([0x64, 0x69, 0x66, 0x66, 0x20])
with open(file_path, "rb") as f:
return f.read(5) == signatureHow to validate .diff files in Node.js
Node.js
function isDIFF(buffer: Buffer): boolean {
const signature = Buffer.from([0x64, 0x69, 0x66, 0x66, 0x20]);
return buffer.subarray(0, 5).equals(signature);
}
Go
func IsDIFF(data []byte) bool {
signature := []byte{0x64, 0x69, 0x66, 0x66, 0x20}
if len(data) < 5 {
return false
}
return bytes.Equal(data[:5], signature)
}API Endpoint
GET
/api/v1/diff
curl https://filesignature.org/api/v1/diff