Introduction

xxHash framework in Swift.
A framework includes XXH32/XXH64/XXH3-64/XXH3-128 functions.

Original xxHash algorithm created by Yann Collet.

Requirements

• Platforms
  • iOS 10.0+
  • macOS 10.12+
  • tvOS 12.0+
  • Linux
• Swift 5.0

Installation

Carthage

github "daisuke-t-jp/xxHash-Swift"

CocoaPods

use_frameworks!

target 'target' do
pod 'xxHash-Swift'
end

Usage

Import framework

import xxHash_Swift

XXH32

Generate digest(One-shot)

let digest = XXH32.digest("123456789ABCDEF")
// digest -> 0x576e3cf9

// Using seed.
let digest = XXH32.digest("123456789ABCDEF", seed: 0x7fffffff)
// digest -> 0xa7f06f9d

Generate digest(Streaming)

// Create xxHash instance
let xxh = XXH32() // if using seed, e.g. "XXH32(0x7fffffff)"

// Get data from file
let bundle = Bundle(for: type(of: self))
let path = bundle.path(forResource: "alice29", ofType: "txt")!
let data = NSData(contentsOfFile: path)! as Data

let bufSize = 1024
var index = 0

repeat {
    var lastIndex = index + bufSize
    if lastIndex > data.count {
        lastIndex = index + data.count - index
    }

    let data2 = data[index..<lastIndex]
    xxh.update(data2) // xxHash update

    index += data2.count
    if index >= data.count {
        break
    }
} while(true)

let digest = xxh.digest()
// digest -> 0xafc8e0c2

XXH64

Generate digest(One-shot)

let digest = XXH64.digest("123456789ABCDEF")
// digest -> 0xa66df83f00e9202d

// Using seed.
let digest = XXH64.digest("123456789ABCDEF", seed: 0x000000007fffffff)
// digest -> 0xe8d84202a16e482f

Generate digest(Streaming)

// Create xxHash instance
let xxh = XXH64() // if using seed, e.g. "XXH64(0x000000007fffffff)"

// Get data from file
let bundle = Bundle(for: type(of: self))
let path = bundle.path(forResource: "alice29", ofType: "txt")!
let data = NSData(contentsOfFile: path)! as Data

let bufSize = 1024
var index = 0

repeat {
    var lastIndex = index + bufSize
    if lastIndex > data.count {
        lastIndex = index + data.count - index
    }

    let data2 = data[index..<lastIndex]
    xxh.update(data2) // xxHash update

    index += data2.count
    if index >= data.count {
        break
    }
} while(true)

let digest = xxh.digest()
// digest -> 0x843c2c4ccfbfb749

XXH3-64

Generate digest(One-shot)

let digest = XXH3.digest64("123456789ABCDEF")
// digest -> 0xfb28db77f56706e8

// Using seed.
let digest = XXH3.digest64("123456789ABCDEF", seed: 0x000000007fffffff)
// digest -> 0xced1ef1da8aa95ae

XXH3-128

Generate digest(One-shot)

let digest = XXH3.digest128("123456789ABCDEF")
// digest[0] -> 0x208cfe2ef00d2aaa
// digest[1] -> 0x9b72015eec4abbf3

// Using seed.
let digest = XXH3.digest128("123456789ABCDEF", seed: 0x000000007fffffff)
// digest[0] -> 0x50554db504518e64
// digest[1] -> 0xc8fb00b18f99658c

Demo

There are demos.

• iOS
• macOS
• tvOS