1// Protocol Buffers for Go with Gadgets
2//
3// Copyright (c) 2013, The GoGo Authors. All rights reserved.
4// http://github.com/gogo/protobuf
5//
6// Redistribution and use in source and binary forms, with or without
7// modification, are permitted provided that the following conditions are
8// met:
9//
10//     * Redistributions of source code must retain the above copyright
11// notice, this list of conditions and the following disclaimer.
12//     * Redistributions in binary form must reproduce the above
13// copyright notice, this list of conditions and the following disclaimer
14// in the documentation and/or other materials provided with the
15// distribution.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29package test
30
31import (
32	"bytes"
33	"encoding/hex"
34	"encoding/json"
35)
36
37func PutLittleEndianUint64(b []byte, offset int, v uint64) {
38	b[offset] = byte(v)
39	b[offset+1] = byte(v >> 8)
40	b[offset+2] = byte(v >> 16)
41	b[offset+3] = byte(v >> 24)
42	b[offset+4] = byte(v >> 32)
43	b[offset+5] = byte(v >> 40)
44	b[offset+6] = byte(v >> 48)
45	b[offset+7] = byte(v >> 56)
46}
47
48type Uuid []byte
49
50func (uuid Uuid) Bytes() []byte {
51	return uuid
52}
53
54func (uuid Uuid) Marshal() ([]byte, error) {
55	if len(uuid) == 0 {
56		return nil, nil
57	}
58	return []byte(uuid), nil
59}
60
61func (uuid Uuid) MarshalTo(data []byte) (n int, err error) {
62	if len(uuid) == 0 {
63		return 0, nil
64	}
65	copy(data, uuid)
66	return 16, nil
67}
68
69func (uuid *Uuid) Unmarshal(data []byte) error {
70	if len(data) == 0 {
71		uuid = nil
72		return nil
73	}
74	id := Uuid(make([]byte, 16))
75	copy(id, data)
76	*uuid = id
77	return nil
78}
79
80func (uuid *Uuid) Size() int {
81	if uuid == nil {
82		return 0
83	}
84	if len(*uuid) == 0 {
85		return 0
86	}
87	return 16
88}
89
90func (uuid Uuid) MarshalJSON() ([]byte, error) {
91	s := hex.EncodeToString([]byte(uuid))
92	return json.Marshal(s)
93}
94
95func (uuid *Uuid) UnmarshalJSON(data []byte) error {
96	var s string
97	err := json.Unmarshal(data, &s)
98	if err != nil {
99		return err
100	}
101	d, err := hex.DecodeString(s)
102	if err != nil {
103		return err
104	}
105	*uuid = Uuid(d)
106	return nil
107}
108
109func (uuid Uuid) Equal(other Uuid) bool {
110	return bytes.Equal(uuid[0:], other[0:])
111}
112
113func (uuid Uuid) Compare(other Uuid) int {
114	return bytes.Compare(uuid[0:], other[0:])
115}
116
117type int63 interface {
118	Int63() int64
119}
120
121func NewPopulatedUuid(r int63) *Uuid {
122	u := RandV4(r)
123	return &u
124}
125
126func RandV4(r int63) Uuid {
127	uuid := make(Uuid, 16)
128	uuid.RandV4(r)
129	return uuid
130}
131
132func (uuid Uuid) RandV4(r int63) {
133	PutLittleEndianUint64(uuid, 0, uint64(r.Int63()))
134	PutLittleEndianUint64(uuid, 8, uint64(r.Int63()))
135	uuid[6] = (uuid[6] & 0xf) | 0x40
136	uuid[8] = (uuid[8] & 0x3f) | 0x80
137}
138