WASM WebAssembly Binary

SIGNATURE = bytes.fromhex("0061736d01000000")
OFFSET = 0

def is_wasm(path: str) -> bool:
    with open(path, "rb") as f:
        f.seek(OFFSET)
        head = f.read(len(SIGNATURE))
    return head == SIGNATURE

const SIGNATURE = [0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00];
const OFFSET = 0;

// bytes: a Uint8Array / Buffer holding the start of the file
export function isWasm(bytes) {
  return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}

package fileid

import "bytes"

var iswasmSignature = []byte{0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00}

const iswasmOffset = 0

func IsWasm(b []byte) bool {
	end := iswasmOffset + len(iswasmSignature)
	if len(b) < end {
		return false
	}
	return bytes.Equal(b[iswasmOffset:end], iswasmSignature)
}

const SIGNATURE: &[u8] = &[0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00];
const OFFSET: usize = 0;

fn is_wasm(bytes: &[u8]) -> bool {
    bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}

<?php
$signature = "\x00\x61\x73\x6d\x01\x00\x00\x00";
$offset = 0;

function is_wasm(string $bytes): bool {
    global $signature, $offset;
    return substr($bytes, $offset, strlen($signature)) === $signature;
}