JPEG AI Image

import magic
# Note: Due to its novelty, older versions of libmagic may just output 'video/mp4' or 'application/octet-stream' based on the ISOBMFF container.
print(magic.from_file('ai_image.jaii', mime=True))

const fs = require('fs');
// Manually detecting the JPEG AI brand in the ISOBMFF ftyp box
const buffer = Buffer.alloc(12);
const fd = fs.openSync('ai_image.jaii', 'r');
fs.readSync(fd, buffer, 0, 12, 0);
fs.closeSync(fd);
const isFtyp = buffer.toString('ascii', 4, 8) === 'ftyp';
const isJaii = buffer.toString('ascii', 8, 12) === 'jaii';
console.log(isFtyp && isJaii);

import (
    "bytes"
    "net/http"
)
// Custom ISOBMFF detection for the JPEG AI brand
// func isJPEG_AI(buf []byte) bool {
//     return len(buf) > 12 && string(buf[4:8]) == "ftyp" && string(buf[8:12]) == "jaii"
// }

// Standard PHP setups may default to identifying the ISOBMFF container.
$mime = mime_content_type('ai_image.jaii');
echo $mime; // Depending on server updates, may need manual hex sniffing.