Olympus Raw Format

import magic
# Libmagic natively detects the 'IIRO', 'IIRS', and 'MMOR' signatures as Olympus raw files
print(magic.from_file('photo.orf', mime=True)) # Outputs 'image/x-olympus-orf'

const fs = require('fs');
// Manually detecting the 4-byte Olympus ORF magic signatures
const buffer = Buffer.alloc(4);
const fd = fs.openSync('photo.orf', 'r');
fs.readSync(fd, buffer, 0, 4, 0);
fs.closeSync(fd);
const signature = buffer.toString('ascii');
const isORF = ['IIRO', 'MMOR', 'IIRS', 'II+M'].includes(signature);
console.log('Is Olympus ORF:', isORF);

import (
    "bytes"
    "net/http"
)
// Native Go HTTP detection will likely return application/octet-stream.
// Check directly for the explicit 4-byte Olympus signatures:
// isORF := bytes.HasPrefix(buf, []byte("IIRO")) || bytes.HasPrefix(buf, []byte("MMOR")) || bytes.HasPrefix(buf, []byte("IIRS"))

$mime = mime_content_type('photo.orf');
echo $mime; // Standard PHP setups with updated magic definitions will return 'image/x-olympus-orf'