Drawing Exchange Format

import magic
# Libmagic may identify ASCII DXF files simply as 'text/plain'.
print(magic.from_file('layout.dxf', mime=True)) # May output 'text/plain' or 'image/vnd.dxf'

const fs = require('fs');
// Simple ASCII DXF sniff reading the first few lines
const buffer = Buffer.alloc(256);
const fd = fs.openSync('layout.dxf', 'r');
fs.readSync(fd, buffer, 0, 256, 0);
fs.closeSync(fd);
const content = buffer.toString('utf8');
const isDxf = content.includes('SECTION') && content.includes('HEADER');
console.log(isDxf);

import (
    "bytes"
    "net/http"
)
// Binary DXF check
// isBinaryDXF := bytes.HasPrefix(buf, []byte("AutoCAD Binary DXF\r\n\x1a\x00"))

$mime = mime_content_type('layout.dxf');
echo $mime; // Standard setups may resolve this to 'text/plain' for ASCII DXF files