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juce_Uuid.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23namespace juce
24{
25
27{
28 Random r;
29
30 for (size_t i = 0; i < sizeof (uuid); ++i)
31 uuid[i] = (uint8) (r.nextInt (256));
32
33 // To make it RFC 4122 compliant, need to force a few bits...
34 uuid[6] = (uuid[6] & 0x0f) | 0x40;
35 uuid[8] = (uuid[8] & 0x3f) | 0x80;
36}
37
38Uuid::~Uuid() noexcept {}
39
40Uuid::Uuid (const Uuid& other) noexcept
41{
42 memcpy (uuid, other.uuid, sizeof (uuid));
43}
44
45Uuid& Uuid::operator= (const Uuid& other) noexcept
46{
47 memcpy (uuid, other.uuid, sizeof (uuid));
48 return *this;
49}
50
51bool Uuid::operator== (const Uuid& other) const noexcept { return memcmp (uuid, other.uuid, sizeof (uuid)) == 0; }
52bool Uuid::operator!= (const Uuid& other) const noexcept { return ! operator== (other); }
53
54bool Uuid::operator< (const Uuid& other) const noexcept { return compare (other) < 0; }
55bool Uuid::operator> (const Uuid& other) const noexcept { return compare (other) > 0; }
56bool Uuid::operator<= (const Uuid& other) const noexcept { return compare (other) <= 0; }
57bool Uuid::operator>= (const Uuid& other) const noexcept { return compare (other) >= 0; }
58
59int Uuid::compare (Uuid other) const noexcept
60{
61 for (size_t i = 0; i < sizeof (uuid); ++i)
62 if (int diff = uuid[i] - (int) other.uuid[i])
63 return diff > 0 ? 1 : -1;
64
65 return 0;
66}
67
68Uuid Uuid::null() noexcept
69{
70 return Uuid ((const uint8*) nullptr);
71}
72
73bool Uuid::isNull() const noexcept
74{
75 for (auto i : uuid)
76 if (i != 0)
77 return false;
78
79 return true;
80}
81
82String Uuid::getHexRegion (int start, int length) const
83{
84 return String::toHexString (uuid + start, length, 0);
85}
86
88{
89 return getHexRegion (0, 16);
90}
91
93{
94 return getHexRegion (0, 4)
95 + "-" + getHexRegion (4, 2)
96 + "-" + getHexRegion (6, 2)
97 + "-" + getHexRegion (8, 2)
98 + "-" + getHexRegion (10, 6);
99}
100
101Uuid::Uuid (const String& uuidString)
102{
103 operator= (uuidString);
104}
105
106Uuid& Uuid::operator= (const String& uuidString)
107{
108 MemoryBlock mb;
109 mb.loadFromHexString (uuidString);
110 mb.ensureSize (sizeof (uuid), true);
111 mb.copyTo (uuid, 0, sizeof (uuid));
112 return *this;
113}
114
115Uuid::Uuid (const uint8* const rawData) noexcept
116{
117 operator= (rawData);
118}
119
120Uuid& Uuid::operator= (const uint8* const rawData) noexcept
121{
122 if (rawData != nullptr)
123 memcpy (uuid, rawData, sizeof (uuid));
124 else
125 zeromem (uuid, sizeof (uuid));
126
127 return *this;
128}
129
130uint32 Uuid::getTimeLow() const noexcept { return ByteOrder::bigEndianInt (uuid); }
131uint16 Uuid::getTimeMid() const noexcept { return ByteOrder::bigEndianShort (uuid + 4); }
132uint16 Uuid::getTimeHighAndVersion() const noexcept { return ByteOrder::bigEndianShort (uuid + 6); }
133uint8 Uuid::getClockSeqAndReserved() const noexcept { return uuid[8]; }
134uint8 Uuid::getClockSeqLow() const noexcept { return uuid[9]; }
135uint64 Uuid::getNode() const noexcept { return (((uint64) ByteOrder::bigEndianShort (uuid + 10)) << 32) + ByteOrder::bigEndianInt (uuid + 12); }
136
137uint64 Uuid::hash() const noexcept
138{
139 uint64 result = 0;
140
141 for (auto n : uuid)
142 result = ((uint64) 101) * result + n;
143
144 return result;
145}
146
147} // namespace juce
static JUCE_CONSTEXPR uint16 bigEndianShort(const void *bytes) noexcept
static JUCE_CONSTEXPR uint32 bigEndianInt(const void *bytes) noexcept
void ensureSize(const size_t minimumSize, bool initialiseNewSpaceToZero=false)
void copyTo(void *destData, int sourceOffset, size_t numBytes) const noexcept
void loadFromHexString(StringRef sourceHexString)
int nextInt() noexcept
Definition: juce_Random.cpp:78
static String toHexString(IntegerType number)
Definition: juce_String.h:1053
uint64 hash() const noexcept
Definition: juce_Uuid.cpp:137
String toString() const
Definition: juce_Uuid.cpp:87
Uuid & operator=(const Uuid &) noexcept
Definition: juce_Uuid.cpp:45
~Uuid() noexcept
Definition: juce_Uuid.cpp:38
uint8 getClockSeqAndReserved() const noexcept
Definition: juce_Uuid.cpp:133
uint16 getTimeMid() const noexcept
Definition: juce_Uuid.cpp:131
uint32 getTimeLow() const noexcept
Definition: juce_Uuid.cpp:130
uint8 getClockSeqLow() const noexcept
Definition: juce_Uuid.cpp:134
uint16 getTimeHighAndVersion() const noexcept
Definition: juce_Uuid.cpp:132
bool isNull() const noexcept
Definition: juce_Uuid.cpp:73
String toDashedString() const
Definition: juce_Uuid.cpp:92
uint64 getNode() const noexcept
Definition: juce_Uuid.cpp:135
static Uuid null() noexcept
Definition: juce_Uuid.cpp:68