Panasonic RAW Image

import magic
# Libmagic can distinguish RW2 files due to their unique 'IIU' header
print(magic.from_file('photo.rw2', mime=True)) # Outputs 'image/x-panasonic-rw2' or 'image/x-panasonic-raw'

const fs = require('fs');
// Manually detecting the 4-byte Panasonic RW2 magic signature
const buffer = Buffer.alloc(4);
const fd = fs.openSync('photo.rw2', 'r');
fs.readSync(fd, buffer, 0, 4, 0);
fs.closeSync(fd);
const isRW2 = buffer[0] === 0x49 && buffer[1] === 0x49 && buffer[2] === 0x55 && buffer[3] === 0x00; // I, I, U, \x00
console.log('Is Panasonic RW2:', isRW2);

import (
    "bytes"
    "net/http"
)
// Native Go HTTP detection might return application/octet-stream.
// Check directly for the explicit 4-byte RW2 signature:
// isRW2 := bytes.HasPrefix(buf, []byte{0x49, 0x49, 0x55, 0x00})

$mime = mime_content_type('photo.rw2');
echo $mime; // Standard PHP setups with updated magic definitions will return 'image/x-panasonic-rw2'