Sigma X3F RAW Image

import magic
# Libmagic can easily detect the 'FOVb' Foveon header
print(magic.from_file('photo.x3f', mime=True)) # Outputs 'image/x-sigma-x3f' or 'image/x3f'

const fs = require('fs');
// Manually detecting the 4-byte 'FOVb' magic signature
const buffer = Buffer.alloc(4);
const fd = fs.openSync('photo.x3f', 'r');
fs.readSync(fd, buffer, 0, 4, 0);
fs.closeSync(fd);
const isX3F = buffer[0] === 0x46 && buffer[1] === 0x4F && buffer[2] === 0x56 && buffer[3] === 0x62; // F, O, V, b
console.log('Is Sigma X3F:', isX3F);

import (
    "bytes"
    "net/http"
)
// Native Go HTTP detection might return application/octet-stream.
// Check directly for the explicit 4-byte Foveon signature:
// isX3F := bytes.HasPrefix(buf, []byte("FOVb"))

$mime = mime_content_type('photo.x3f');
echo $mime; // Standard PHP setups with updated magic definitions will return 'image/x-sigma-x3f'