QuickTime Image Format

import magic
# Libmagic can often detect QTIF files via the 'idsc' atom header
print(magic.from_file('graphic.qtif', mime=True)) # Outputs 'image/x-quicktime'

const fs = require('fs');
// Sniffing for the 'idsc' QuickTime atom at byte offset 4
const buffer = Buffer.alloc(8);
const fd = fs.openSync('graphic.qtif', 'r');
fs.readSync(fd, buffer, 0, 8, 0);
fs.closeSync(fd);
const isQTIF = buffer[4] === 0x69 && buffer[5] === 0x64 && buffer[6] === 0x73 && buffer[7] === 0x63; // i, d, s, c
console.log('Is QuickTime Image Format (QTIF):', isQTIF);

import (
    "bytes"
    "net/http"
    "strings"
)
// Native Go HTTP detection does not recognize QTIF.
// You must explicitly check the extension or the 'idsc' atom:
// isQTIF := len(buf) >= 8 && string(buf[4:8]) == "idsc"

$mime = mime_content_type('graphic.qtif');
echo $mime; // Standard PHP setups will likely return 'image/x-quicktime' or fallback to 'application/octet-stream'