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
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
// Copyright 2013-2014 The Rust Project Developers.
// Copyright 2018 The Uuid Project Developers.
//
// See the COPYRIGHT file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! A Builder type for [`Uuid`]s.
//!
//! [`Uuid`]: ../struct.Uuid.html

mod error;
pub(crate) use self::error::Error;

use crate::prelude::*;

impl Uuid {
    /// The 'nil UUID'.
    ///
    /// The nil UUID is special form of UUID that is specified to have all
    /// 128 bits set to zero, as defined in [IETF RFC 4122 Section 4.1.7][RFC].
    ///
    /// [RFC]: https://tools.ietf.org/html/rfc4122.html#section-4.1.7
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use uuid::Uuid;
    ///
    /// let uuid = Uuid::nil();
    ///
    /// assert_eq!(
    ///     uuid.to_hyphenated().to_string(),
    ///     "00000000-0000-0000-0000-000000000000"
    /// );
    /// ```
    pub const fn nil() -> Self {
        Uuid::from_bytes([0; 16])
    }

    /// Creates a UUID from four field values in big-endian order.
    ///
    /// # Errors
    ///
    /// This function will return an error if `d4`'s length is not 8 bytes.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use uuid::Uuid;
    ///
    /// let d4 = [12, 3, 9, 56, 54, 43, 8, 9];
    ///
    /// let uuid = Uuid::from_fields(42, 12, 5, &d4);
    /// let uuid = uuid.map(|uuid| uuid.to_hyphenated().to_string());
    ///
    /// let expected_uuid =
    ///     Ok(String::from("0000002a-000c-0005-0c03-0938362b0809"));
    ///
    /// assert_eq!(expected_uuid, uuid);
    /// ```
    pub fn from_fields(
        d1: u32,
        d2: u16,
        d3: u16,
        d4: &[u8],
    ) -> Result<Uuid, crate::Error> {
        const D4_LEN: usize = 8;

        let len = d4.len();

        if len != D4_LEN {
            Err(Error::new(D4_LEN, len))?;
        }

        Ok(Uuid::from_bytes([
            (d1 >> 24) as u8,
            (d1 >> 16) as u8,
            (d1 >> 8) as u8,
            d1 as u8,
            (d2 >> 8) as u8,
            d2 as u8,
            (d3 >> 8) as u8,
            d3 as u8,
            d4[0],
            d4[1],
            d4[2],
            d4[3],
            d4[4],
            d4[5],
            d4[6],
            d4[7],
        ]))
    }

    /// Creates a UUID from four field values in little-endian order.
    ///
    /// The bytes in the `d1`, `d2` and `d3` fields will
    /// be converted into big-endian order.
    ///
    /// # Examples
    ///
    /// ```
    /// use uuid::Uuid;
    ///
    /// let d1 = 0xAB3F1097u32;
    /// let d2 = 0x501Eu16;
    /// let d3 = 0xB736u16;
    /// let d4 = [12, 3, 9, 56, 54, 43, 8, 9];
    ///
    /// let uuid = Uuid::from_fields_le(d1, d2, d3, &d4);
    /// let uuid = uuid.map(|uuid| uuid.to_hyphenated().to_string());
    ///
    /// let expected_uuid =
    ///     Ok(String::from("97103fab-1e50-36b7-0c03-0938362b0809"));
    ///
    /// assert_eq!(expected_uuid, uuid);
    /// ```
    pub fn from_fields_le(
        d1: u32,
        d2: u16,
        d3: u16,
        d4: &[u8],
    ) -> Result<Uuid, crate::Error> {
        const D4_LEN: usize = 8;

        let len = d4.len();

        if len != D4_LEN {
            Err(Error::new(D4_LEN, len))?;
        }

        Ok(Uuid::from_bytes([
            d1 as u8,
            (d1 >> 8) as u8,
            (d1 >> 16) as u8,
            (d1 >> 24) as u8,
            (d2) as u8,
            (d2 >> 8) as u8,
            d3 as u8,
            (d3 >> 8) as u8,
            d4[0],
            d4[1],
            d4[2],
            d4[3],
            d4[4],
            d4[5],
            d4[6],
            d4[7],
        ]))
    }

    /// Creates a UUID from a 128bit value in big-endian order.
    pub const fn from_u128(v: u128) -> Self {
        Uuid::from_bytes([
            (v >> 120) as u8,
            (v >> 112) as u8,
            (v >> 104) as u8,
            (v >> 96) as u8,
            (v >> 88) as u8,
            (v >> 80) as u8,
            (v >> 72) as u8,
            (v >> 64) as u8,
            (v >> 56) as u8,
            (v >> 48) as u8,
            (v >> 40) as u8,
            (v >> 32) as u8,
            (v >> 24) as u8,
            (v >> 16) as u8,
            (v >> 8) as u8,
            v as u8,
        ])
    }

    /// Creates a UUID from a 128bit value in little-endian order.
    pub const fn from_u128_le(v: u128) -> Self {
        Uuid::from_bytes([
            v as u8,
            (v >> 8) as u8,
            (v >> 16) as u8,
            (v >> 24) as u8,
            (v >> 32) as u8,
            (v >> 40) as u8,
            (v >> 48) as u8,
            (v >> 56) as u8,
            (v >> 64) as u8,
            (v >> 72) as u8,
            (v >> 80) as u8,
            (v >> 88) as u8,
            (v >> 96) as u8,
            (v >> 104) as u8,
            (v >> 112) as u8,
            (v >> 120) as u8,
        ])
    }

    /// Creates a UUID using the supplied big-endian bytes.
    ///
    /// # Errors
    ///
    /// This function will return an error if `b` has any length other than 16.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use uuid::Uuid;
    ///
    /// let bytes = [4, 54, 67, 12, 43, 2, 98, 76, 32, 50, 87, 5, 1, 33, 43, 87];
    ///
    /// let uuid = Uuid::from_slice(&bytes);
    /// let uuid = uuid.map(|uuid| uuid.to_hyphenated().to_string());
    ///
    /// let expected_uuid =
    ///     Ok(String::from("0436430c-2b02-624c-2032-570501212b57"));
    ///
    /// assert_eq!(expected_uuid, uuid);
    /// ```
    ///
    /// An incorrect number of bytes:
    ///
    /// ```
    /// use uuid::Uuid;
    ///
    /// let bytes = [4, 54, 67, 12, 43, 2, 98, 76];
    ///
    /// let uuid = Uuid::from_slice(&bytes);
    ///
    /// assert!(uuid.is_err());
    /// ```
    pub fn from_slice(b: &[u8]) -> Result<Uuid, crate::Error> {
        const BYTES_LEN: usize = 16;

        let len = b.len();

        if len != BYTES_LEN {
            Err(Error::new(BYTES_LEN, len))?;
        }

        let mut bytes: Bytes = [0; 16];
        bytes.copy_from_slice(b);
        Ok(Uuid::from_bytes(bytes))
    }

    /// Creates a UUID using the supplied big-endian bytes.
    pub const fn from_bytes(bytes: Bytes) -> Uuid {
        Uuid(bytes)
    }
}

/// A builder struct for creating a UUID.
///
/// # Examples
///
/// Creating a v4 UUID from externally generated bytes:
///
/// ```
/// use uuid::{Builder, Variant, Version};
///
/// # let rng = || [
/// #     70, 235, 208, 238, 14, 109, 67, 201, 185, 13, 204, 195, 90,
/// # 145, 63, 62,
/// # ];
/// let random_bytes = rng();
/// let uuid = Builder::from_bytes(random_bytes)
///     .set_variant(Variant::RFC4122)
///     .set_version(Version::Random)
///     .build();
/// ```
// TODO: remove in 1.0.0
#[allow(dead_code)]
#[deprecated]
pub type Builder = crate::Builder;

impl crate::Builder {
    /// Creates a `Builder` using the supplied big-endian bytes.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// let bytes: uuid::Bytes = [
    ///     70, 235, 208, 238, 14, 109, 67, 201, 185, 13, 204, 195, 90, 145, 63, 62,
    /// ];
    ///
    /// let mut builder = uuid::Builder::from_bytes(bytes);
    /// let uuid = builder.build().to_hyphenated().to_string();
    ///
    /// let expected_uuid = String::from("46ebd0ee-0e6d-43c9-b90d-ccc35a913f3e");
    ///
    /// assert_eq!(expected_uuid, uuid);
    /// ```
    ///
    /// An incorrect number of bytes:
    ///
    /// ```compile_fail
    /// let bytes: uuid::Bytes = [4, 54, 67, 12, 43, 2, 98, 76]; // doesn't compile
    ///
    /// let uuid = uuid::Builder::from_bytes(bytes);
    /// ```
    pub const fn from_bytes(b: Bytes) -> Self {
        Builder(b)
    }

    /// Creates a `Builder` using the supplied big-endian bytes.
    ///
    /// # Errors
    ///
    /// This function will return an error if `b` has any length other than 16.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// let bytes = [4, 54, 67, 12, 43, 2, 98, 76, 32, 50, 87, 5, 1, 33, 43, 87];
    ///
    /// let builder = uuid::Builder::from_slice(&bytes);
    /// let uuid =
    ///     builder.map(|mut builder| builder.build().to_hyphenated().to_string());
    ///
    /// let expected_uuid =
    ///     Ok(String::from("0436430c-2b02-624c-2032-570501212b57"));
    ///
    /// assert_eq!(expected_uuid, uuid);
    /// ```
    ///
    /// An incorrect number of bytes:
    ///
    /// ```
    /// let bytes = [4, 54, 67, 12, 43, 2, 98, 76];
    ///
    /// let builder = uuid::Builder::from_slice(&bytes);
    ///
    /// assert!(builder.is_err());
    /// ```
    pub fn from_slice(b: &[u8]) -> Result<Self, crate::Error> {
        const BYTES_LEN: usize = 16;

        let len = b.len();

        if len != BYTES_LEN {
            Err(Error::new(BYTES_LEN, len))?;
        }

        let mut bytes: crate::Bytes = [0; 16];
        bytes.copy_from_slice(b);
        Ok(Self::from_bytes(bytes))
    }

    /// Creates a `Builder` from four big-endian field values.
    ///
    /// # Errors
    ///
    /// This function will return an error if `d4`'s length is not 8 bytes.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// let d4 = [12, 3, 9, 56, 54, 43, 8, 9];
    ///
    /// let builder = uuid::Builder::from_fields(42, 12, 5, &d4);
    /// let uuid =
    ///     builder.map(|mut builder| builder.build().to_hyphenated().to_string());
    ///
    /// let expected_uuid =
    ///     Ok(String::from("0000002a-000c-0005-0c03-0938362b0809"));
    ///
    /// assert_eq!(expected_uuid, uuid);
    /// ```
    ///
    /// An invalid length:
    ///
    /// ```
    /// let d4 = [12];
    ///
    /// let builder = uuid::Builder::from_fields(42, 12, 5, &d4);
    ///
    /// assert!(builder.is_err());
    /// ```
    pub fn from_fields(
        d1: u32,
        d2: u16,
        d3: u16,
        d4: &[u8],
    ) -> Result<Self, crate::Error> {
        Uuid::from_fields(d1, d2, d3, d4).map(|uuid| {
            let bytes = *uuid.as_bytes();

            crate::Builder::from_bytes(bytes)
        })
    }

    /// Creates a `Builder` from a big-endian 128bit value.
    pub fn from_u128(v: u128) -> Self {
        crate::Builder::from_bytes(*Uuid::from_u128(v).as_bytes())
    }

    /// Creates a `Builder` with an initial [`Uuid::nil`].
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use uuid::Builder;
    ///
    /// let mut builder = Builder::nil();
    ///
    /// assert_eq!(
    ///     builder.build().to_hyphenated().to_string(),
    ///     "00000000-0000-0000-0000-000000000000"
    /// );
    /// ```
    pub const fn nil() -> Self {
        Builder([0; 16])
    }

    /// Specifies the variant of the UUID.
    pub fn set_variant(&mut self, v: crate::Variant) -> &mut Self {
        let byte = self.0[8];

        self.0[8] = match v {
            crate::Variant::NCS => byte & 0x7f,
            crate::Variant::RFC4122 => (byte & 0x3f) | 0x80,
            crate::Variant::Microsoft => (byte & 0x1f) | 0xc0,
            crate::Variant::Future => (byte & 0x1f) | 0xe0,
        };

        self
    }

    /// Specifies the version number of the UUID.
    pub fn set_version(&mut self, v: crate::Version) -> &mut Self {
        self.0[6] = (self.0[6] & 0x0f) | ((v as u8) << 4);

        self
    }

    /// Hands over the internal constructed [`Uuid`].
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use uuid::Builder;
    ///
    /// let uuid = Builder::nil().build();
    ///
    /// assert_eq!(
    ///     uuid.to_hyphenated().to_string(),
    ///     "00000000-0000-0000-0000-000000000000"
    /// );
    /// ```
    ///
    /// [`Uuid`]: struct.Uuid.html
    pub fn build(&mut self) -> Uuid {
        Uuid::from_bytes(self.0)
    }
}