1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
package uuid
import "base:runtime"
import "core:time"
/*
Convert a string to a UUID.
Inputs:
- str: A string in the 8-4-4-4-12 format.
Returns:
- id: The converted identifier, or `nil` if there is an error.
- error: A description of the error, or `nil` if successful.
*/
read :: proc "contextless" (str: string) -> (id: Identifier, error: Read_Error) #no_bounds_check {
// Only exact-length strings are acceptable.
if len(str) != EXPECTED_LENGTH {
return {}, .Invalid_Length
}
// Check ahead to see if the separators are in the right places.
if str[8] != '-' || str[13] != '-' || str[18] != '-' || str[23] != '-' {
return {}, .Invalid_Separator
}
read_nibble :: proc "contextless" (nibble: u8) -> u8 {
switch nibble {
case '0' ..= '9':
return nibble - '0'
case 'A' ..= 'F':
return nibble - 'A' + 10
case 'a' ..= 'f':
return nibble - 'a' + 10
case:
// Return an error value.
return 0xFF
}
}
index := 0
octet_index := 0
CHUNKS :: [5]int{8, 4, 4, 4, 12}
for chunk in CHUNKS {
for i := index; i < index + chunk; i += 2 {
high := read_nibble(str[i])
low := read_nibble(str[i + 1])
if high | low > 0xF {
return {}, .Invalid_Hexadecimal
}
id[octet_index] = low | high << 4
octet_index += 1
}
index += chunk + 1
}
return
}
/*
Get the version of a UUID.
Inputs:
- id: The identifier.
Returns:
- number: The version number.
*/
version :: proc "contextless" (id: Identifier) -> (number: int) #no_bounds_check {
return cast(int)(id[VERSION_BYTE_INDEX] & 0xF0 >> 4)
}
/*
Get the variant of a UUID.
Inputs:
- id: The identifier.
Returns:
- variant: The variant type.
*/
variant :: proc "contextless" (id: Identifier) -> (variant: Variant_Type) #no_bounds_check {
switch {
case id[VARIANT_BYTE_INDEX] & 0x80 == 0:
return .Reserved_Apollo_NCS
case id[VARIANT_BYTE_INDEX] & 0xC0 == 0x80:
return .RFC_4122
case id[VARIANT_BYTE_INDEX] & 0xE0 == 0xC0:
return .Reserved_Microsoft_COM
case id[VARIANT_BYTE_INDEX] & 0xF0 == 0xE0:
return .Reserved_Future
case:
return .Unknown
}
}
/*
Get the clock sequence of a version 1 or version 6 UUID.
Inputs:
- id: The identifier.
Returns:
- clock_seq: The 14-bit clock sequence field.
*/
clock_seq :: proc "contextless" (id: Identifier) -> (clock_seq: u16) {
return cast(u16)id[9] | cast(u16)id[8] & 0x3F << 8
}
/*
Get the node of a version 1 or version 6 UUID.
Inputs:
- id: The identifier.
Returns:
- node: The 48-bit spatially unique identifier.
*/
node :: proc "contextless" (id: Identifier) -> (node: [6]u8) {
mutable_id := id
runtime.mem_copy_non_overlapping(&node, &mutable_id[10], 6)
return
}
/*
Get the raw timestamp of a version 1 UUID.
Inputs:
- id: The identifier.
Returns:
- timestamp: The timestamp, in 100-nanosecond intervals since 1582-10-15.
*/
raw_time_v1 :: proc "contextless" (id: Identifier) -> (timestamp: u64) {
timestamp_octets: [8]u8
timestamp_octets[0] = id[0]
timestamp_octets[1] = id[1]
timestamp_octets[2] = id[2]
timestamp_octets[3] = id[3]
timestamp_octets[4] = id[4]
timestamp_octets[5] = id[5]
timestamp_octets[6] = id[6] << 4 | id[7] >> 4
timestamp_octets[7] = id[7] & 0xF
return cast(u64)transmute(u64le)timestamp_octets
}
/*
Get the timestamp of a version 1 UUID.
Inputs:
- id: The identifier.
Returns:
- timestamp: The timestamp of the UUID.
*/
time_v1 :: proc "contextless" (id: Identifier) -> (timestamp: time.Time) {
return time.from_nanoseconds(cast(i64)(raw_time_v1(id) - HNS_INTERVALS_BETWEEN_GREG_AND_UNIX) * 100)
}
/*
Get the raw timestamp of a version 6 UUID.
Inputs:
- id: The identifier.
Returns:
- timestamp: The timestamp, in 100-nanosecond intervals since 1582-10-15.
*/
raw_time_v6 :: proc "contextless" (id: Identifier) -> (timestamp: u64) {
temporary := transmute(u128be)id
timestamp |= cast(u64)(temporary & 0xFFFFFFFF_FFFF0000_00000000_00000000 >> 68)
timestamp |= cast(u64)(temporary & 0x00000000_00000FFF_00000000_00000000 >> 64)
return timestamp
}
/*
Get the timestamp of a version 6 UUID.
Inputs:
- id: The identifier.
Returns:
- timestamp: The timestamp, in 100-nanosecond intervals since 1582-10-15.
*/
time_v6 :: proc "contextless" (id: Identifier) -> (timestamp: time.Time) {
return time.from_nanoseconds(cast(i64)(raw_time_v6(id) - HNS_INTERVALS_BETWEEN_GREG_AND_UNIX) * 100)
}
/*
Get the raw timestamp of a version 7 UUID.
Inputs:
- id: The identifier.
Returns:
- timestamp: The timestamp, in milliseconds since the UNIX epoch.
*/
raw_time_v7 :: proc "contextless" (id: Identifier) -> (timestamp: u64) {
time_bits := transmute(u128be)id & VERSION_7_TIME_MASK
return cast(u64)(time_bits >> VERSION_7_TIME_SHIFT)
}
/*
Get the timestamp of a version 7 UUID.
Inputs:
- id: The identifier.
Returns:
- timestamp: The timestamp, in milliseconds since the UNIX epoch.
*/
time_v7 :: proc "contextless" (id: Identifier) -> (timestamp: time.Time) {
return time.from_nanoseconds(cast(i64)raw_time_v7(id) * 1e6)
}
/*
Get the 12-bit counter value of a version 7 UUID.
The UUID must have been generated with a counter, otherwise this procedure will
return random bits.
Inputs:
- id: The identifier.
Returns:
- counter: The 12-bit counter value.
*/
counter_v7 :: proc "contextless" (id: Identifier) -> (counter: u16) {
counter_bits := transmute(u128be)id & VERSION_7_COUNTER_MASK
return cast(u16)(counter_bits >> VERSION_7_COUNTER_SHIFT)
}
|
