AOL ART Image

import magic
# Libmagic can often identify the Johnson-Grace header
print(magic.from_file('vintage.art', mime=True)) # May output 'image/x-jg' or generic 'application/octet-stream' depending on definitions

const fs = require('fs');
// Manually detecting the 'JG' magic bytes to differentiate from other .art files
const buffer = Buffer.alloc(2);
const fd = fs.openSync('vintage.art', 'r');
fs.readSync(fd, buffer, 0, 2, 0);
fs.closeSync(fd);
const isAolArt = buffer[0] === 0x4A && buffer[1] === 0x47; // 'J' and 'G'
console.log('Is AOL ART (Johnson-Grace):', isAolArt);

import (
    "bytes"
    "net/http"
)
// Native Go HTTP detection will not recognize the ART format.
// You must explicitly check for the 2-byte signature.
// isAolArt := bytes.HasPrefix(buf, []byte{0x4A, 0x47})

$mime = mime_content_type('vintage.art');
echo $mime; // Standard PHP setups will likely return 'application/octet-stream'. Custom magic.mime rules are required.