CMU Window Manager Raster

import magic
# Libmagic contains definitions for the CMU Window Manager bitmap magic bytes.
print(magic.from_file('archive.ras', mime=True)) # Outputs 'image/x-cmu-raster'

const fs = require('fs');
// Manually detecting the CMU Raster magic bytes to avoid Sun Raster (.ras) conflicts
const buffer = Buffer.alloc(4);
const fd = fs.openSync('archive.ras', 'r');
fs.readSync(fd, buffer, 0, 4, 0);
fs.closeSync(fd);
const isCmuRaster = buffer[0] === 0xF1 && buffer[1] === 0x00 && buffer[2] === 0x40 && buffer[3] === 0xBB;
console.log('Is CMU Raster:', isCmuRaster);

import (
    "bytes"
    "net/http"
)
// Native Go HTTP detection will not recognize CMU Raster.
// You must explicitly check for the 4-byte magic signature.
// isCmuRaster := bytes.HasPrefix(buf, []byte{0xF1, 0x00, 0x40, 0xBB})

$mime = mime_content_type('archive.ras');
echo $mime; // Standard PHP setups will likely return 'application/octet-stream' or incorrectly map the extension to 'image/x-sun-raster'