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
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
mod error;
mod raw;
mod serde;
pub use self::{
error::{Error, Result},
serde::{Deserializer, DeserializerOptions},
};
use std::io::Read;
use crate::{
bson::{Array, Binary, Bson, DbPointer, Document, JavaScriptCodeWithScope, Regex, Timestamp},
oid::{self, ObjectId},
raw::RawBinaryRef,
ser::write_i32,
spec::{self, BinarySubtype},
Decimal128,
};
use ::serde::{
de::{DeserializeOwned, Error as _, Unexpected},
Deserialize,
};
pub(crate) use self::serde::{convert_unsigned_to_signed_raw, BsonVisitor};
#[cfg(test)]
pub(crate) use self::raw::Deserializer as RawDeserializer;
pub(crate) const MAX_BSON_SIZE: i32 = 16 * 1024 * 1024;
pub(crate) const MIN_BSON_DOCUMENT_SIZE: i32 = 4 + 1;
pub(crate) const MIN_BSON_STRING_SIZE: i32 = 4 + 1;
pub(crate) const MIN_CODE_WITH_SCOPE_SIZE: i32 = 4 + MIN_BSON_STRING_SIZE + MIN_BSON_DOCUMENT_SIZE;
#[derive(Debug, Clone, Copy)]
enum DeserializerHint {
None,
BinarySubtype(BinarySubtype),
RawBson,
}
pub(crate) fn ensure_read_exactly<F, R>(
reader: &mut R,
length: usize,
error_message: &str,
func: F,
) -> Result<()>
where
F: FnOnce(&mut std::io::Cursor<Vec<u8>>) -> Result<()>,
R: Read + ?Sized,
{
let mut buf = vec![0u8; length];
reader.read_exact(&mut buf)?;
let mut cursor = std::io::Cursor::new(buf);
func(&mut cursor)?;
if cursor.position() != length as u64 {
return Err(Error::invalid_length(length, &error_message));
}
Ok(())
}
pub(crate) fn read_string<R: Read + ?Sized>(reader: &mut R, utf8_lossy: bool) -> Result<String> {
let len = read_i32(reader)?;
if len < 1 {
return Err(Error::invalid_length(
len as usize,
&"UTF-8 string must have at least 1 byte",
));
}
let s = if utf8_lossy {
let mut buf = Vec::with_capacity(len as usize - 1);
reader.take(len as u64 - 1).read_to_end(&mut buf)?;
String::from_utf8_lossy(&buf).to_string()
} else {
let mut s = String::with_capacity(len as usize - 1);
reader.take(len as u64 - 1).read_to_string(&mut s)?;
s
};
if read_u8(reader)? != 0 {
return Err(Error::invalid_length(
len as usize,
&"contents of string longer than provided length",
));
}
Ok(s)
}
pub(crate) fn read_bool<R: Read>(mut reader: R) -> Result<bool> {
let val = read_u8(&mut reader)?;
if val > 1 {
return Err(Error::invalid_value(
Unexpected::Unsigned(val as u64),
&"boolean must be stored as 0 or 1",
));
}
Ok(val != 0)
}
fn read_cstring<R: Read + ?Sized>(reader: &mut R) -> Result<String> {
let mut v = Vec::new();
loop {
let c = read_u8(reader)?;
if c == 0 {
break;
}
v.push(c);
}
Ok(String::from_utf8(v)?)
}
#[inline]
pub(crate) fn read_u8<R: Read + ?Sized>(reader: &mut R) -> Result<u8> {
let mut buf = [0; 1];
reader.read_exact(&mut buf)?;
Ok(u8::from_le_bytes(buf))
}
#[inline]
pub(crate) fn read_i32<R: Read + ?Sized>(reader: &mut R) -> Result<i32> {
let mut buf = [0; 4];
reader.read_exact(&mut buf)?;
Ok(i32::from_le_bytes(buf))
}
#[inline]
pub(crate) fn read_i64<R: Read + ?Sized>(reader: &mut R) -> Result<i64> {
let mut buf = [0; 8];
reader.read_exact(&mut buf)?;
Ok(i64::from_le_bytes(buf))
}
#[inline]
fn read_f64<R: Read + ?Sized>(reader: &mut R) -> Result<f64> {
let mut buf = [0; 8];
reader.read_exact(&mut buf)?;
Ok(f64::from_le_bytes(buf))
}
#[inline]
fn read_f128<R: Read + ?Sized>(reader: &mut R) -> Result<Decimal128> {
let mut buf = [0u8; 128 / 8];
reader.read_exact(&mut buf)?;
Ok(Decimal128 { bytes: buf })
}
fn deserialize_array<R: Read + ?Sized>(reader: &mut R, utf8_lossy: bool) -> Result<Array> {
let mut arr = Array::new();
let length = read_i32(reader)?;
if !(MIN_BSON_DOCUMENT_SIZE..=MAX_BSON_SIZE).contains(&length) {
return Err(Error::invalid_length(
length as usize,
&format!(
"array length must be between {} and {}",
MIN_BSON_DOCUMENT_SIZE, MAX_BSON_SIZE
)
.as_str(),
));
}
ensure_read_exactly(
reader,
(length as usize) - 4,
"array length longer than contents",
|cursor| {
loop {
let tag = read_u8(cursor)?;
if tag == 0 {
break;
}
let (_, val) = deserialize_bson_kvp(cursor, tag, utf8_lossy)?;
arr.push(val)
}
Ok(())
},
)?;
Ok(arr)
}
pub(crate) fn deserialize_bson_kvp<R: Read + ?Sized>(
reader: &mut R,
tag: u8,
utf8_lossy: bool,
) -> Result<(String, Bson)> {
use spec::ElementType;
let key = read_cstring(reader)?;
let val = match ElementType::from(tag) {
Some(ElementType::Double) => Bson::Double(read_f64(reader)?),
Some(ElementType::String) => read_string(reader, utf8_lossy).map(Bson::String)?,
Some(ElementType::EmbeddedDocument) => Document::from_reader(reader).map(Bson::Document)?,
Some(ElementType::Array) => deserialize_array(reader, utf8_lossy).map(Bson::Array)?,
Some(ElementType::Binary) => Bson::Binary(Binary::from_reader(reader)?),
Some(ElementType::ObjectId) => {
let mut objid = [0; 12];
for x in &mut objid {
*x = read_u8(reader)?;
}
Bson::ObjectId(oid::ObjectId::from_bytes(objid))
}
Some(ElementType::Boolean) => Bson::Boolean(read_bool(reader)?),
Some(ElementType::Null) => Bson::Null,
Some(ElementType::RegularExpression) => {
Bson::RegularExpression(Regex::from_reader(reader)?)
}
Some(ElementType::JavaScriptCode) => {
read_string(reader, utf8_lossy).map(Bson::JavaScriptCode)?
}
Some(ElementType::JavaScriptCodeWithScope) => {
Bson::JavaScriptCodeWithScope(JavaScriptCodeWithScope::from_reader(reader, utf8_lossy)?)
}
Some(ElementType::Int32) => read_i32(reader).map(Bson::Int32)?,
Some(ElementType::Int64) => read_i64(reader).map(Bson::Int64)?,
Some(ElementType::Timestamp) => Bson::Timestamp(Timestamp::from_reader(reader)?),
Some(ElementType::DateTime) => {
let time = read_i64(reader)?;
Bson::DateTime(crate::DateTime::from_millis(time))
}
Some(ElementType::Symbol) => read_string(reader, utf8_lossy).map(Bson::Symbol)?,
Some(ElementType::Decimal128) => read_f128(reader).map(Bson::Decimal128)?,
Some(ElementType::Undefined) => Bson::Undefined,
Some(ElementType::DbPointer) => Bson::DbPointer(DbPointer::from_reader(reader)?),
Some(ElementType::MaxKey) => Bson::MaxKey,
Some(ElementType::MinKey) => Bson::MinKey,
None => {
return Err(Error::UnrecognizedDocumentElementType {
key,
element_type: tag,
})
}
};
Ok((key, val))
}
impl Binary {
pub(crate) fn from_reader<R: Read>(mut reader: R) -> Result<Self> {
let mut len = read_i32(&mut reader)?;
if !(0..=MAX_BSON_SIZE).contains(&len) {
return Err(Error::invalid_length(
len as usize,
&format!("binary length must be between 0 and {}", MAX_BSON_SIZE).as_str(),
));
}
let subtype = BinarySubtype::from(read_u8(&mut reader)?);
if let BinarySubtype::BinaryOld = subtype {
let data_len = read_i32(&mut reader)?;
if !(0..=(MAX_BSON_SIZE - 4)).contains(&data_len) {
return Err(Error::invalid_length(
data_len as usize,
&format!("0x02 length must be between 0 and {}", MAX_BSON_SIZE - 4).as_str(),
));
}
if data_len + 4 != len {
return Err(Error::invalid_length(
data_len as usize,
&"0x02 length did not match top level binary length",
));
}
len -= 4;
}
let mut bytes = Vec::with_capacity(len as usize);
reader.take(len as u64).read_to_end(&mut bytes)?;
Ok(Binary { subtype, bytes })
}
}
impl<'a> RawBinaryRef<'a> {
pub(crate) fn from_slice_with_len_and_payload(
mut bytes: &'a [u8],
mut len: i32,
subtype: BinarySubtype,
) -> Result<Self> {
if !(0..=MAX_BSON_SIZE).contains(&len) {
return Err(Error::invalid_length(
len as usize,
&format!("binary length must be between 0 and {}", MAX_BSON_SIZE).as_str(),
));
} else if len as usize > bytes.len() {
return Err(Error::invalid_length(
len as usize,
&format!(
"binary length {} exceeds buffer length {}",
len,
bytes.len()
)
.as_str(),
));
}
if let BinarySubtype::BinaryOld = subtype {
let data_len = read_i32(&mut bytes)?;
if data_len + 4 != len {
return Err(Error::invalid_length(
data_len as usize,
&"0x02 length did not match top level binary length",
));
}
len -= 4;
}
Ok(Self {
bytes: &bytes[0..len as usize],
subtype,
})
}
}
impl DbPointer {
pub(crate) fn from_reader<R: Read>(mut reader: R) -> Result<Self> {
let ns = read_string(&mut reader, false)?;
let oid = ObjectId::from_reader(&mut reader)?;
Ok(DbPointer {
namespace: ns,
id: oid,
})
}
}
impl Regex {
pub(crate) fn from_reader<R: Read>(mut reader: R) -> Result<Self> {
let pattern = read_cstring(&mut reader)?;
let options = read_cstring(&mut reader)?;
Ok(Regex { pattern, options })
}
}
impl Timestamp {
pub(crate) fn from_reader<R: Read>(mut reader: R) -> Result<Self> {
read_i64(&mut reader).map(Timestamp::from_le_i64)
}
}
impl ObjectId {
pub(crate) fn from_reader<R: Read>(mut reader: R) -> Result<Self> {
let mut buf = [0u8; 12];
reader.read_exact(&mut buf)?;
Ok(Self::from_bytes(buf))
}
}
impl JavaScriptCodeWithScope {
pub(crate) fn from_reader<R: Read>(mut reader: R, utf8_lossy: bool) -> Result<Self> {
let length = read_i32(&mut reader)?;
if length < MIN_CODE_WITH_SCOPE_SIZE {
return Err(Error::invalid_length(
length as usize,
&format!(
"code with scope length must be at least {}",
MIN_CODE_WITH_SCOPE_SIZE
)
.as_str(),
));
} else if length > MAX_BSON_SIZE {
return Err(Error::invalid_length(
length as usize,
&"code with scope length too large",
));
}
let mut buf = vec![0u8; (length - 4) as usize];
reader.read_exact(&mut buf)?;
let mut slice = buf.as_slice();
let code = read_string(&mut slice, utf8_lossy)?;
let scope = Document::from_reader(&mut slice)?;
Ok(JavaScriptCodeWithScope { code, scope })
}
}
pub fn from_bson<T>(bson: Bson) -> Result<T>
where
T: DeserializeOwned,
{
let de = Deserializer::new(bson);
Deserialize::deserialize(de)
}
pub fn from_bson_with_options<T>(bson: Bson, options: DeserializerOptions) -> Result<T>
where
T: DeserializeOwned,
{
let de = Deserializer::new_with_options(bson, options);
Deserialize::deserialize(de)
}
pub fn from_document<T>(doc: Document) -> Result<T>
where
T: DeserializeOwned,
{
from_bson(Bson::Document(doc))
}
pub fn from_document_with_options<T>(doc: Document, options: DeserializerOptions) -> Result<T>
where
T: DeserializeOwned,
{
let de = Deserializer::new_with_options(Bson::Document(doc), options);
Deserialize::deserialize(de)
}
fn reader_to_vec<R: Read>(mut reader: R) -> Result<Vec<u8>> {
let length = read_i32(&mut reader)?;
if length < MIN_BSON_DOCUMENT_SIZE {
return Err(Error::custom("document size too small"));
}
let mut bytes = Vec::with_capacity(length as usize);
write_i32(&mut bytes, length).map_err(Error::custom)?;
reader.take(length as u64 - 4).read_to_end(&mut bytes)?;
Ok(bytes)
}
pub fn from_reader<R, T>(reader: R) -> Result<T>
where
T: DeserializeOwned,
R: Read,
{
let bytes = reader_to_vec(reader)?;
from_slice(bytes.as_slice())
}
pub fn from_reader_utf8_lossy<R, T>(reader: R) -> Result<T>
where
T: DeserializeOwned,
R: Read,
{
let bytes = reader_to_vec(reader)?;
from_slice_utf8_lossy(bytes.as_slice())
}
pub fn from_slice<'de, T>(bytes: &'de [u8]) -> Result<T>
where
T: Deserialize<'de>,
{
let mut deserializer = raw::Deserializer::new(bytes, false);
T::deserialize(&mut deserializer)
}
pub fn from_slice_utf8_lossy<'de, T>(bytes: &'de [u8]) -> Result<T>
where
T: Deserialize<'de>,
{
let mut deserializer = raw::Deserializer::new(bytes, true);
T::deserialize(&mut deserializer)
}