XstarS.GuidModule 1.1.1

F# GUID Module

Provides RFC 4122 UUID compliant GUID operations for F#.

RFC 4122 UUID Standard

RFC 4122 defines the following five versions of UUID:

• Version 1: The time-based version, contains 60-bit timestamp and 12-bit MAC address
• Version 2: DCE Security version, contains 28-bit timestamp, 12-bit MAC address and 32-bit local ID
• Version 3: The name-based version, using MD5 hashing to compute the hash of the namespace and name
• Version 4: The randomly or pseudo-andomly generated version, equivalent to Guid.NewGuid() in .NET
• Version 5: The name-based version, using SHA-1 hashing to compute the hash of the namespace and name

There is also a special nil UUID, which is equivalent to Guid.Empty in .NET.

• RFC 4122 UUID Standard
• DCE Security UUID Standard

F# GUID Module Usage

RFC 4122 GUID Generation

open XNetEx.FSharp.Core

// time-based GUID generation.
let guidV1 = Guid.newV1 ()
// randomized GUID generation.
let guidV4 = Guid.newV4 ()

// name-based GUID generation.
let guidV3 = Guid.newV3S Guid.nsDns "github.com"
let guidV5 = "github.com" |> Guid.newV5S Guid.nsDns

Common GUID Operations

open XNetEx.FSharp.Core

// GUID parsing and formatting.
let guid1 = Guid.parse "6ba7b810-9dad-11d1-80b4-00c04fd430c8"
let guid2 = "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}"
            |> Guid.parseExact "B"
printfn (guid2 |> Guid.format "X")

// GUID construction and deconstruction.
let guid3 = Guid.ofFields
                0x00112233 0x4455s 0x6677s (0x88uy, 0x99uy)
                (0xAAuy, 0xBBuy, 0xCCuy, 0xDDuy, 0xEEuy, 0xFFuy)
let guid3Fields = guid3 |> Guid.toFields

let guid4 = Array.map byte
                [| 0x00; 0x11; 0x22; 0x33; 0x44; 0x55; 0x66; 0x77
                   0x88; 0x99; 0xAA; 0xBB; 0xCC; 0xDD; 0xEE; 0xFF |]
            |> Guid.ofBytesUuid
let guid4Bytes = Guid.toBytes guid4
assert (guid3 = guid4)

let guid5 = Array.map byte
                [| 0x33; 0x22; 0x11; 0x00; 0x55; 0x44; 0x77; 0x66
                   0x88; 0x99; 0xAA; 0xBB; 0xCC; 0xDD; 0xEE; 0xFF |]
            |> Guid.ofBytes
let guid5Bytes = Guid.toBytesUuid guid5
assert (guid3 = guid5)