This tool detects a file’s MIME type using magic bytes and can retrieve the file extension based on the MIME type.
It can identify the MIME type of Data, based on Swime and ported from file-type.
The Extensions, mimeTypes, and mimeTypesAll data in the dependency package are all generated by scripts based on file-type.
The function for checking whether the bytes match the MimeType specification is generated from a mapping.js mapping file created using data from the file-type package.
Since the data may not always be accurate, it can be corrected by modifying the mapping.js file.
Add CodeMirror to your project using Xcode:
- In Xcode, go to
File→Add Package Dependencies... - Enter the repository URL:
https://github.com/jaywcjlove/FileType.git - Click
Add Package
Or add it to your Package.swift file:
dependencies: [ .package(url: "https://github.com/jaywcjlove/FileType.git", from: "1.0.0") ]
Inspect mime type
import FileType let path = "/path/to/some-file.jpg" let url = URL(fileURLWithPath: path, isDirectory: false) let data = try! Data(contentsOf: url) let mimeType = FileType.mimeType(data: data) mimeType?.type == .jpg // true mimeType! // MimeType(mime: "image/jpeg", ext: "jpg", type: .jpg)
Get the file extension from a MIME type
let avroMimeType = MimeType.mimeTypesAll.first { $0.mime == "application/avro" } if let avroMimeType = avroMimeType { avroMimeType.mime // "application/avro" avroMimeType.type // .avro avroMimeType.type.rawValue // "avro" }
let mimeTypes = MimeType.mimeTypes.first(where: { $0.key == "application/mp4" }) if let mimeTypes = mimeTypes { mimeTypes.compressible mimeTypes.extensions // ["mp4","mpg4","mp4s","m4p"] }
Thanks to these projects:
- https://github.com/sendyhalim/Swime
- https://github.com/sindresorhus/file-type
- https://github.com/jshttp/mime-db
Licensed under the MIT License.