summaryrefslogtreecommitdiffstats
path: root/lib/nghttp2_buf.c
blob: a32844712e449335c3b39bd3c88e73ac0d9281c6 (plain)
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
/*
 * nghttp2 - HTTP/2 C Library
 *
 * Copyright (c) 2014 Tatsuhiro Tsujikawa
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include "nghttp2_buf.h"

#include <stdio.h>

#include "nghttp2_helper.h"
#include "nghttp2_debug.h"

void nghttp2_buf_init(nghttp2_buf *buf) {
  buf->begin = NULL;
  buf->end = NULL;
  buf->pos = NULL;
  buf->last = NULL;
  buf->mark = NULL;
}

int nghttp2_buf_init2(nghttp2_buf *buf, size_t initial, nghttp2_mem *mem) {
  nghttp2_buf_init(buf);
  return nghttp2_buf_reserve(buf, initial, mem);
}

void nghttp2_buf_free(nghttp2_buf *buf, nghttp2_mem *mem) {
  if (buf == NULL) {
    return;
  }

  nghttp2_mem_free(mem, buf->begin);
  buf->begin = NULL;
}

int nghttp2_buf_reserve(nghttp2_buf *buf, size_t new_cap, nghttp2_mem *mem) {
  uint8_t *ptr;
  size_t cap;

  cap = nghttp2_buf_cap(buf);

  if (cap >= new_cap) {
    return 0;
  }

  new_cap = nghttp2_max(new_cap, cap * 2);

  ptr = nghttp2_mem_realloc(mem, buf->begin, new_cap);
  if (ptr == NULL) {
    return NGHTTP2_ERR_NOMEM;
  }

  buf->pos = ptr + (buf->pos - buf->begin);
  buf->last = ptr + (buf->last - buf->begin);
  buf->mark = ptr + (buf->mark - buf->begin);
  buf->begin = ptr;
  buf->end = ptr + new_cap;

  return 0;
}

void nghttp2_buf_reset(nghttp2_buf *buf) {
  buf->pos = buf->last = buf->mark = buf->begin;
}

void nghttp2_buf_wrap_init(nghttp2_buf *buf, uint8_t *begin, size_t len) {
  buf->begin = buf->pos = buf->last = buf->mark = buf->end = begin;
  if (len) {
    buf->end += len;
  }
}

static int buf_chain_new(nghttp2_buf_chain **chain, size_t chunk_length,
                         nghttp2_mem *mem) {
  int rv;

  *chain = nghttp2_mem_malloc(mem, sizeof(nghttp2_buf_chain));
  if (*chain == NULL) {
    return NGHTTP2_ERR_NOMEM;
  }

  (*chain)->next = NULL;

  rv = nghttp2_buf_init2(&(*chain)->buf, chunk_length, mem);
  if (rv != 0) {
    nghttp2_mem_free(mem, *chain);
    return NGHTTP2_ERR_NOMEM;
  }

  return 0;
}

static void buf_chain_del(nghttp2_buf_chain *chain, nghttp2_mem *mem) {
  nghttp2_buf_free(&chain->buf, mem);
  nghttp2_mem_free(mem, chain);
}

int nghttp2_bufs_init(nghttp2_bufs *bufs, size_t chunk_length, size_t max_chunk,
                      nghttp2_mem *mem) {
  return nghttp2_bufs_init2(bufs, chunk_length, max_chunk, 0, mem);
}

int nghttp2_bufs_init2(nghttp2_bufs *bufs, size_t chunk_length,
                       size_t max_chunk, size_t offset, nghttp2_mem *mem) {
  return nghttp2_bufs_init3(bufs, chunk_length, max_chunk, max_chunk, offset,
                            mem);
}

int nghttp2_bufs_init3(nghttp2_bufs *bufs, size_t chunk_length,
                       size_t max_chunk, size_t chunk_keep, size_t offset,
                       nghttp2_mem *mem) {
  int rv;
  nghttp2_buf_chain *chain;

  if (chunk_keep == 0 || max_chunk < chunk_keep || chunk_length < offset) {
    return NGHTTP2_ERR_INVALID_ARGUMENT;
  }

  rv = buf_chain_new(&chain, chunk_length, mem);
  if (rv != 0) {
    return rv;
  }

  bufs->mem = mem;
  bufs->offset = offset;

  bufs->head = chain;
  bufs->cur = bufs->head;

  nghttp2_buf_shift_right(&bufs->cur->buf, offset);

  bufs->chunk_length = chunk_length;
  bufs->chunk_used = 1;
  bufs->max_chunk = max_chunk;
  bufs->chunk_keep = chunk_keep;

  return 0;
}

int nghttp2_bufs_realloc(nghttp2_bufs *bufs, size_t chunk_length) {
  int rv;
  nghttp2_buf_chain *chain;

  if (chunk_length < bufs->offset) {
    return NGHTTP2_ERR_INVALID_ARGUMENT;
  }

  rv = buf_chain_new(&chain, chunk_length, bufs->mem);
  if (rv != 0) {
    return rv;
  }

  nghttp2_bufs_free(bufs);

  bufs->head = chain;
  bufs->cur = bufs->head;

  nghttp2_buf_shift_right(&bufs->cur->buf, bufs->offset);

  bufs->chunk_length = chunk_length;
  bufs->chunk_used = 1;

  return 0;
}

void nghttp2_bufs_free(nghttp2_bufs *bufs) {
  nghttp2_buf_chain *chain, *next_chain;

  if (bufs == NULL) {
    return;
  }

  for (chain = bufs->head; chain;) {
    next_chain = chain->next;

    buf_chain_del(chain, bufs->mem);

    chain = next_chain;
  }

  bufs->head = NULL;
}

int nghttp2_bufs_wrap_init(nghttp2_bufs *bufs, uint8_t *begin, size_t len,
                           nghttp2_mem *mem) {
  nghttp2_buf_chain *chain;

  chain = nghttp2_mem_malloc(mem, sizeof(nghttp2_buf_chain));
  if (chain == NULL) {
    return NGHTTP2_ERR_NOMEM;
  }

  chain->next = NULL;

  nghttp2_buf_wrap_init(&chain->buf, begin, len);

  bufs->mem = mem;
  bufs->offset = 0;

  bufs->head = chain;
  bufs->cur = bufs->head;

  bufs->chunk_length = len;
  bufs->chunk_used = 1;
  bufs->max_chunk = 1;
  bufs->chunk_keep = 1;

  return 0;
}

int nghttp2_bufs_wrap_init2(nghttp2_bufs *bufs, const nghttp2_vec *vec,
                            size_t veclen, nghttp2_mem *mem) {
  size_t i = 0;
  nghttp2_buf_chain *cur_chain;
  nghttp2_buf_chain *head_chain;
  nghttp2_buf_chain **dst_chain = &head_chain;

  if (veclen == 0) {
    return nghttp2_bufs_wrap_init(bufs, NULL, 0, mem);
  }

  head_chain = nghttp2_mem_malloc(mem, sizeof(nghttp2_buf_chain) * veclen);
  if (head_chain == NULL) {
    return NGHTTP2_ERR_NOMEM;
  }

  for (i = 0; i < veclen; ++i) {
    cur_chain = &head_chain[i];
    cur_chain->next = NULL;
    nghttp2_buf_wrap_init(&cur_chain->buf, vec[i].base, vec[i].len);

    *dst_chain = cur_chain;
    dst_chain = &cur_chain->next;
  }

  bufs->mem = mem;
  bufs->offset = 0;

  bufs->head = head_chain;
  bufs->cur = bufs->head;

  /* We don't use chunk_length since no allocation is expected. */
  bufs->chunk_length = 0;
  bufs->chunk_used = veclen;
  bufs->max_chunk = veclen;
  bufs->chunk_keep = veclen;

  return 0;
}

void nghttp2_bufs_wrap_free(nghttp2_bufs *bufs) {
  if (bufs == NULL) {
    return;
  }

  if (bufs->head) {
    nghttp2_mem_free(bufs->mem, bufs->head);
  }
}

void nghttp2_bufs_seek_last_present(nghttp2_bufs *bufs) {
  nghttp2_buf_chain *ci;

  for (ci = bufs->cur; ci; ci = ci->next) {
    if (nghttp2_buf_len(&ci->buf) == 0) {
      return;
    } else {
      bufs->cur = ci;
    }
  }
}

size_t nghttp2_bufs_len(nghttp2_bufs *bufs) {
  nghttp2_buf_chain *ci;
  size_t len;

  len = 0;
  for (ci = bufs->head; ci; ci = ci->next) {
    len += nghttp2_buf_len(&ci->buf);
  }

  return len;
}

static int bufs_alloc_chain(nghttp2_bufs *bufs) {
  int rv;
  nghttp2_buf_chain *chain;

  if (bufs->cur->next) {
    bufs->cur = bufs->cur->next;

    return 0;
  }

  if (bufs->max_chunk == bufs->chunk_used) {
    return NGHTTP2_ERR_BUFFER_ERROR;
  }

  rv = buf_chain_new(&chain, bufs->chunk_length, bufs->mem);
  if (rv != 0) {
    return rv;
  }

  DEBUGF("new buffer %zu bytes allocated for bufs %p, used %zu\n",
         bufs->chunk_length, bufs, bufs->chunk_used);

  ++bufs->chunk_used;

  bufs->cur->next = chain;
  bufs->cur = chain;

  nghttp2_buf_shift_right(&bufs->cur->buf, bufs->offset);

  return 0;
}

int nghttp2_bufs_add(nghttp2_bufs *bufs, const void *data, size_t len) {
  int rv;
  size_t nwrite;
  nghttp2_buf *buf;
  const uint8_t *p;

  p = data;

  while (len) {
    buf = &bufs->cur->buf;

    nwrite = nghttp2_min(nghttp2_buf_avail(buf), len);
    if (nwrite == 0) {
      rv = bufs_alloc_chain(bufs);
      if (rv != 0) {
        return rv;
      }
      continue;
    }

    buf->last = nghttp2_cpymem(buf->last, p, nwrite);
    p += nwrite;
    len -= nwrite;
  }

  return 0;
}

static int bufs_ensure_addb(nghttp2_bufs *bufs) {
  int rv;
  nghttp2_buf *buf;

  buf = &bufs->cur->buf;

  if (nghttp2_buf_avail(buf) > 0) {
    return 0;
  }

  rv = bufs_alloc_chain(bufs);
  if (rv != 0) {
    return rv;
  }

  return 0;
}

int nghttp2_bufs_addb(nghttp2_bufs *bufs, uint8_t b) {
  int rv;

  rv = bufs_ensure_addb(bufs);
  if (rv != 0) {
    return rv;
  }

  *bufs->cur->buf.last++ = b;

  return 0;
}

int nghttp2_bufs_addb_hold(nghttp2_bufs *bufs, uint8_t b) {
  int rv;

  rv = bufs_ensure_addb(bufs);
  if (rv != 0) {
    return rv;
  }

  *bufs->cur->buf.last = b;

  return 0;
}

int nghttp2_bufs_orb(nghttp2_bufs *bufs, uint8_t b) {
  int rv;

  rv = bufs_ensure_addb(bufs);
  if (rv != 0) {
    return rv;
  }

  *bufs->cur->buf.last++ |= b;

  return 0;
}

int nghttp2_bufs_orb_hold(nghttp2_bufs *bufs, uint8_t b) {
  int rv;

  rv = bufs_ensure_addb(bufs);
  if (rv != 0) {
    return rv;
  }

  *bufs->cur->buf.last |= b;

  return 0;
}

ssize_t nghttp2_bufs_remove(nghttp2_bufs *bufs, uint8_t **out) {
  size_t len;
  nghttp2_buf_chain *chain;
  nghttp2_buf *buf;
  uint8_t *res;
  nghttp2_buf resbuf;

  len = 0;

  for (chain = bufs->head; chain; chain = chain->next) {
    len += nghttp2_buf_len(&chain->buf);
  }

  if (len == 0) {
    res = NULL;
    return 0;
  }

  res = nghttp2_mem_malloc(bufs->mem, len);
  if (res == NULL) {
    return NGHTTP2_ERR_NOMEM;
  }

  nghttp2_buf_wrap_init(&resbuf, res, len);

  for (chain = bufs->head; chain; chain = chain->next) {
    buf = &chain->buf;
    resbuf.last = nghttp2_cpymem(resbuf.last, buf->pos, nghttp2_buf_len(buf));
  }

  *out = res;

  return (ssize_t)len;
}

size_t nghttp2_bufs_remove_copy(nghttp2_bufs *bufs, uint8_t *out) {
  size_t len;
  nghttp2_buf_chain *chain;
  nghttp2_buf *buf;
  nghttp2_buf resbuf;

  len = nghttp2_bufs_len(bufs);

  nghttp2_buf_wrap_init(&resbuf, out, len);

  for (chain = bufs->head; chain; chain = chain->next) {
    buf = &chain->buf;
    resbuf.last = nghttp2_cpymem(resbuf.last, buf->pos, nghttp2_buf_len(buf));
  }

  return len;
}

void nghttp2_bufs_reset(nghttp2_bufs *bufs) {
  nghttp2_buf_chain *chain, *ci;
  size_t k;

  k = bufs->chunk_keep;

  for (ci = bufs->head; ci; ci = ci->next) {
    nghttp2_buf_reset(&ci->buf);
    nghttp2_buf_shift_right(&ci->buf, bufs->offset);

    if (--k == 0) {
      break;
    }
  }

  if (ci) {
    chain = ci->next;
    ci->next = NULL;

    for (ci = chain; ci;) {
      chain = ci->next;

      buf_chain_del(ci, bufs->mem);

      ci = chain;
    }

    bufs->chunk_used = bufs->chunk_keep;
  }

  bufs->cur = bufs->head;
}

int nghttp2_bufs_advance(nghttp2_bufs *bufs) { return bufs_alloc_chain(bufs); }

int nghttp2_bufs_next_present(nghttp2_bufs *bufs) {
  nghttp2_buf_chain *chain;

  chain = bufs->cur->next;

  return chain && nghttp2_buf_len(&chain->buf);
}