Canon Raw Version 2

import magic
# Libmagic will reliably detect Canon CR2 by looking for the 'CR' signature inside the TIFF header
print(magic.from_file('photo.cr2', mime=True)) # Outputs 'image/x-canon-cr2'

const FileType = require('file-type');
const type = await FileType.fromFile('photo.cr2');
console.log(type.mime); // Outputs 'image/x-canon-cr2'

import (
    "bytes"
    "net/http"
)
// Native Go HTTP detection might only see the TIFF header and return 'image/tiff'.
// You must explicitly check for the 'CR' signature at offset 8.
// isCR2 := len(buf) > 12 && bytes.Equal(buf[0:4], []byte{0x49, 0x49, 0x2A, 0x00}) && bytes.Equal(buf[8:12], []byte{0x43, 0x52, 0x02, 0x00})

$mime = mime_content_type('photo.cr2');
echo $mime; // Standard PHP setups will resolve this to 'image/x-canon-cr2' if the magic database is up to date