ducky/devices: vendor/code.google.com/p/go-uuid/uuid/version4.go annotate

Move DeviceType to its own file, add helper and constants. Make a device_type.go file, to avoid a mess in the devices.go file. Move the DeviceType definition over to the new file. Also, while we're here, set up a few of the contstants we know we'll need. These are the DeviceTypes we intend to support, such as Android phones, Android tablets, and Chrome extensions. Also, set up a helper method that will determine whether a DeviceType is "valid", i.e. if we have a constant defined for it. DeviceTypes, in general, are mostly intended to be used (at the moment, at least) to customise how we display devices to users. Basically, they allow us to display an at least semi-accurate depiction of the device.

paddy@0	1 // Copyright 2011 Google Inc. All rights reserved.
paddy@0	2 // Use of this source code is governed by a BSD-style
paddy@0	3 // license that can be found in the LICENSE file.
paddy@0	4
paddy@0	5 package uuid
paddy@0	6
paddy@0	7 // Random returns a Random (Version 4) UUID or panics.
paddy@0	8 //
paddy@0	9 // The strength of the UUIDs is based on the strength of the crypto/rand
paddy@0	10 // package.
paddy@0	11 //
paddy@0	12 // A note about uniqueness derived from from the UUID Wikipedia entry:
paddy@0	13 //
paddy@0	14 // Randomly generated UUIDs have 122 random bits. One's annual risk of being
paddy@0	15 // hit by a meteorite is estimated to be one chance in 17 billion, that
paddy@0	16 // means the probability is about 0.00000000006 (6 × 10−11),
paddy@0	17 // equivalent to the odds of creating a few tens of trillions of UUIDs in a
paddy@0	18 // year and having one duplicate.
paddy@0	19 func NewRandom() UUID {
paddy@0	20 uuid := make([]byte, 16)
paddy@0	21 randomBits([]byte(uuid))
paddy@0	22 uuid[6] = (uuid[6] & 0x0f) \| 0x40 // Version 4
paddy@0	23 uuid[8] = (uuid[8] & 0x3f) \| 0x80 // Variant is 10
paddy@0	24 return uuid
paddy@0	25 }

ducky/devices

ducky/devices/vendor/code.google.com/p/go-uuid/uuid/version4.go