ZLIB
application/octet-stream
Magic Bytes
Offset: 0
78 01
ZLIB is an abstraction of the DEFLATE compression algorithm, originally developed by Jean-loup Gailly and Mark Adler. This format is extensively utilized within software libraries, network protocols such as HTTP, and as a data storage component for container formats like PNG and PDF. While the compressed data is inherently safe, security risks primarily involve improper implementation of the decompression library or denial-of-service attacks via decompression bombs that target system memory.
Validation Code
How to validate .zlib files in Python
Python
def is_zlib(file_path: str) -> bool:
"""Check if file is a valid ZLIB by magic bytes."""
signature = bytes([0x78, 0x01])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .zlib files in Node.js
Node.js
function isZLIB(buffer: Buffer): boolean {
const signature = Buffer.from([0x78, 0x01]);
return buffer.subarray(0, 2).equals(signature);
}
Go
func IsZLIB(data []byte) bool {
signature := []byte{0x78, 0x01}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
GET
/api/v1/zlib
curl https://filesignature.org/api/v1/zlib