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
|
use std;
use std::cmp;
use std::io;
use std::io::{Error, ErrorKind};
use buffered_reader::{buffered_reader_generic_read_impl, BufferedReader};
use crate::packet::header::BodyLength;
use crate::parse::{Cookie, Hashing};
const TRACE : bool = false;
/// A `BufferedReader` that transparently handles OpenPGP's chunking
/// scheme. This implicitly implements a limitor.
pub(crate) struct BufferedReaderPartialBodyFilter<T: BufferedReader<Cookie>> {
// The underlying reader.
reader: T,
// The amount of unread data in the current partial body chunk.
// That is, if `buffer` contains 10 bytes and
// `partial_body_length` is 20, then there are 30 bytes of
// unprocessed (unconsumed) data in the current chunk.
partial_body_length: u32,
// Whether this is the last partial body chuck.
last: bool,
// Sometimes we have to double buffer. This happens if the caller
// requests X bytes and that chunk straddles a partial body length
// boundary.
buffer: Option<Box<[u8]>>,
// The position within the buffer.
cursor: usize,
// The user-defined cookie.
cookie: Cookie,
// Whether to include the headers in any hash directly over the
// current packet. If not, calls Cookie::hashing at
// the current level to disable hashing while reading headers.
hash_headers: bool,
}
impl<T: BufferedReader<Cookie>> std::fmt::Display
for BufferedReaderPartialBodyFilter<T> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "BufferedReaderPartialBodyFilter")
}
}
impl<T: BufferedReader<Cookie>> std::fmt::Debug
for BufferedReaderPartialBodyFilter<T> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
f.debug_struct("BufferedReaderPartialBodyFilter")
.field("partial_body_length", &self.partial_body_length)
.field("last", &self.last)
.field("hash headers", &self.hash_headers)
.field("buffer (bytes left)",
&if let Some(ref buffer) = self.buffer {
Some(buffer.len())
} else {
None
})
.field("reader", &self.reader)
.finish()
}
}
impl<T: BufferedReader<Cookie>> BufferedReaderPartialBodyFilter<T> {
/// Create a new BufferedReaderPartialBodyFilter object.
/// `partial_body_length` is the amount of data in the initial
/// partial body chunk.
pub fn with_cookie(reader: T, partial_body_length: u32,
hash_headers: bool, cookie: Cookie) -> Self {
BufferedReaderPartialBodyFilter {
reader: reader,
partial_body_length: partial_body_length,
last: false,
buffer: None,
cursor: 0,
cookie: cookie,
hash_headers: hash_headers,
}
}
// Make sure that the local buffer contains `amount` bytes.
fn do_fill_buffer (&mut self, amount: usize) -> Result<(), std::io::Error> {
if TRACE {
eprintln!("BufferedReaderPartialBodyFilter::do_fill_buffer(\
amount: {}) (partial body length: {}, last: {})",
amount, self.partial_body_length, self.last);
}
// We want to avoid double buffering as much as possible.
// Thus, we only buffer as much as needed.
let mut buffer = vec![0; amount];
let mut amount_buffered = 0;
if let Some(ref old_buffer) = self.buffer {
// The amount of data that is left in the old buffer.
let amount_left = old_buffer.len() - self.cursor;
// This function should only be called if we actually need
// to read something.
assert!(amount > amount_left);
amount_buffered = amount_left;
// Copy the data that is still in buffer.
buffer[..amount_buffered]
.copy_from_slice(&old_buffer[self.cursor..]);
}
let mut err = None;
loop {
let to_read = cmp::min(
// Data in current chunk.
self.partial_body_length as usize,
// Space left in the buffer.
buffer.len() - amount_buffered);
if TRACE {
eprintln!("Trying to buffer {} bytes \
(partial body length: {}; space: {})",
to_read, self.partial_body_length,
buffer.len() - amount_buffered);
}
if to_read > 0 {
let result = self.reader.read(
&mut buffer[amount_buffered..amount_buffered + to_read]);
match result {
Ok(did_read) => {
if TRACE {
eprintln!("Buffered {} bytes", did_read);
}
amount_buffered += did_read;
self.partial_body_length -= did_read as u32;
if did_read < to_read {
// Short read => EOF. We're done.
// (Although the underlying message is
// probably corrupt.)
break;
}
},
Err(e) => {
if TRACE {
eprintln!("Err reading: {:?}", e);
}
err = Some(e);
break;
},
}
}
if amount_buffered == amount || self.last {
// We're read enough or we've read everything.
break;
}
// Read the next partial body length header.
assert_eq!(self.partial_body_length, 0);
// Disable hashing, if necessary.
if ! self.hash_headers {
if let Some(level) = self.reader.cookie_ref().level {
Cookie::hashing(
&mut self.reader, Hashing::Disabled, level);
}
}
if TRACE {
eprintln!("Reading next chunk's header (hashing: {}, level: {:?})",
self.hash_headers, self.reader.cookie_ref().level);
}
let body_length = BodyLength::parse_new_format(&mut self.reader);
if ! self.hash_headers {
if let Some(level) = self.reader.cookie_ref().level {
Cookie::hashing(
&mut self.reader, Hashing::Enabled, level);
}
}
match body_length {
Ok(BodyLength::Full(
|