ducky/devices
2015-11-12
Parent:b6494e1a499e
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/hash.go
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.
1 // Copyright 2011 Google Inc. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 package uuid
7 import (
8 "crypto/md5"
9 "crypto/sha1"
10 "hash"
11 )
13 // Well known Name Space IDs and UUIDs
14 var (
15 NameSpace_DNS = Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
16 NameSpace_URL = Parse("6ba7b811-9dad-11d1-80b4-00c04fd430c8")
17 NameSpace_OID = Parse("6ba7b812-9dad-11d1-80b4-00c04fd430c8")
18 NameSpace_X500 = Parse("6ba7b814-9dad-11d1-80b4-00c04fd430c8")
19 NIL = Parse("00000000-0000-0000-0000-000000000000")
20 )
22 // NewHash returns a new UUID dervied from the hash of space concatenated with
23 // data generated by h. The hash should be at least 16 byte in length. The
24 // first 16 bytes of the hash are used to form the UUID. The version of the
25 // UUID will be the lower 4 bits of version. NewHash is used to implement
26 // NewMD5 and NewSHA1.
27 func NewHash(h hash.Hash, space UUID, data []byte, version int) UUID {
28 h.Reset()
29 h.Write(space)
30 h.Write([]byte(data))
31 s := h.Sum(nil)
32 uuid := make([]byte, 16)
33 copy(uuid, s)
34 uuid[6] = (uuid[6] & 0x0f) | uint8((version&0xf)<<4)
35 uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant
36 return uuid
37 }
39 // NewMD5 returns a new MD5 (Version 3) UUID based on the
40 // supplied name space and data.
41 //
42 // NewHash(md5.New(), space, data, 3)
43 func NewMD5(space UUID, data []byte) UUID {
44 return NewHash(md5.New(), space, data, 3)
45 }
47 // NewSHA1 returns a new SHA1 (Version 5) UUID based on the
48 // supplied name space and data.
49 //
50 // NewHash(sha1.New(), space, data, 5)
51 func NewSHA1(space UUID, data []byte) UUID {
52 return NewHash(sha1.New(), space, data, 5)
53 }