Swiftpack.co - Package - stickytools/sticky-encoding

StickyEncoding License: Apache 2.0

Platforms: iOS | macOS | watchOS | tvOS | Linux Swift 4.2 Version   travis-ci.org   Codecov

StickyEncoding, A high performance binary encoder for Swift.Codable types.


StickyEncoding facilitates the encoding and decoding of Codable values into and out of a binary format that can be stored on disk or sent over a socket.

Encoding is done using a BinaryEncoder instance and will encode any Encodable type whether you declare conformance to Encodable and let the compiler create the code, or you manually implement the conformance yourself.

Decoding is done using a BinaryDecoder instance and can decode any Decodable type that was previously encoded using the BinaryEncoder. Of course you can declare Encodable or Decodable conformance by using Codable as well.

StickyEncoding creates a compact binary format that represents the encoded object or data type. You can read more about the format in the document Binary Format.

To facilitate many use cases, StickyEncoding encodes the data to an instance of EncodedData. EncodedData contains a binary format suitable for writing directly to memory, disk, or into a byte array. Or in the case of decoding, the format facilitates rapid decoding to Swift instances.


To create an instance of a BinaryEncoder:

    let encoder = BinaryEncoder()

Note: You may optionally pass your own userInfo BinaryEncoder(userInfo:) structure and it will be available to you during the encoding.

You can encode any top-level single value type including Int, UInt, Double, Bool, and Strings. Simply pass the value to the instance of the BinaryEncoder and call encode.

   let string = "You can encode single values of any type."

   let encoded = try encoder.encode(string)

Basic structs and classes can also be encoded.

   struct Employee: Codable {
        let first: String
        let last: String
        let employeeNumber: Int

   let employee = Employee(first: "John", last: "Doe", employeeNumber: 2345643)

   let encodedData = try encoder.encode(employee)

As well as Complex types with sub classes.


To create an instance of a BinaryDecoder:

    let decoder = BinaryDecoder()

Note: You may optionally pass your own userInfo BinaryDecoder(userInfo:) structure and it will be available to you during the decoding.

To decode, you pass the Type of object to create, and an instance of encoded data representing that type.

   let employee = try decoder.decode(Employee.self, from: encodedData)


The BinaryEncoder.encode method returns a type called EncodedData (likewise BinaryDecoder.decode accepts an EncodedData instance). This type is the direct connection between raw memory and a type that can be converted to and from a Codable object.

StickyEncoding uses this intermediate representation so that it can support many use cases from direct byte conversion to writing/reading directly to/from raw memory.

When encoding of an object, the intermediate representation has already been encoded down to a form that can be rapidly written to memory.

   let encodedData = try encoder.encode(employee)

   // Write the bytes directly to a file.
   FileManager.default.createFile(atPath: "employee.bin", contents: Data(encodedData))

There are use cases that require writing to a buffer or socket in which case StickyEncoding offers a direct write method so that an intermediate structure (byte array) does not have to be created first.

   let encodedData = try encoder.encode(employee)

   // Allocate byte aligned raw memory to hold the binary encoded data.
   let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: encodedData.byteCount, alignment: MemoryLayout<UInt8>.alignment)

   // Write the encoded data directly to the raw memory.
   encodedData.write(to: buffer)

Sources and Binaries

You can find the latest sources and binaries on github.

Communication and Contributions

  • If you found a bug, and can provide steps to reliably reproduce it, open an issue.
  • If you have a feature request, open an issue.
  • If you want to contribute
    • Fork it! StickyEncoding repository
    • Create your feature branch: git checkout -b my-new-feature
    • Commit your changes: git commit -am 'Add some feature'
    • Push to the branch: git push origin my-new-feature
    • Submit a pull request :-)


Swift Package Manager

StickyEncoding supports dependency management via Swift Package Manager on Darwin as well as Linux.

Please see Swift Package Manager for further information.


StickyEncoding is available through CocoaPods. To install it, simply add the following line to your Podfile:

   pod "StickyEncoding"

Minimum Requirements

Build Environment

| Platform | Swift | Swift Build | Xcode | |:--------:|:-----:|:----------:|:------:| | Linux | 4.2 | ✔ | ✘ | | OSX | 4.2 | ✔ | Xcode 10.0 |

Minimum Runtime Version

| iOS | OS X | tvOS | watchOS | Linux | |:---:|:-----:|:----:|:-------:|:------------:| | 8.0 | 10.10 | 9.0 | 2.0 | Ubuntu 14.04, 16.04, 16.10 |


To build and run on Linux we have a a preconfigure Vagrant file located at https://github.com/tonystone/vagrant-swift

See the README for instructions.


Tony Stone (https://github.com/tonystone)


StickyEncoding is released under the Apache License, Version 2.0


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1.0.0-beta.2 - Feb 19, 2019

  • Added CocoaPods support.
  • Added the ability to set a userInfo dictionary on the BinaryEncoder and BinaryDecoder.

1.0.0-beta.1 - Jun 6, 2018

First beta release.