1/*
2 * nghttp3
3 *
4 * Copyright (c) 2022 nghttp3 contributors
5 * Copyright (c) 2022 ngtcp2 contributors
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining
8 * a copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sublicense, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be
16 * included in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26#include "nghttp3_balloc.h"
27
28#include <assert.h>
29
30#include "nghttp3_mem.h"
31
32void nghttp3_balloc_init(nghttp3_balloc *balloc, size_t blklen,
33                         const nghttp3_mem *mem) {
34  assert((blklen & 0xfu) == 0);
35
36  balloc->mem = mem;
37  balloc->blklen = blklen;
38  balloc->head = NULL;
39  nghttp3_buf_wrap_init(&balloc->buf, (void *)"", 0);
40}
41
42void nghttp3_balloc_free(nghttp3_balloc *balloc) {
43  if (balloc == NULL) {
44    return;
45  }
46
47  nghttp3_balloc_clear(balloc);
48}
49
50void nghttp3_balloc_clear(nghttp3_balloc *balloc) {
51  nghttp3_memblock_hd *p, *next;
52
53  for (p = balloc->head; p; p = next) {
54    next = p->next;
55    nghttp3_mem_free(balloc->mem, p);
56  }
57
58  balloc->head = NULL;
59  nghttp3_buf_wrap_init(&balloc->buf, (void *)"", 0);
60}
61
62int nghttp3_balloc_get(nghttp3_balloc *balloc, void **pbuf, size_t n) {
63  uint8_t *p;
64  nghttp3_memblock_hd *hd;
65
66  assert(n <= balloc->blklen);
67
68  if (nghttp3_buf_left(&balloc->buf) < n) {
69    p = nghttp3_mem_malloc(balloc->mem, sizeof(nghttp3_memblock_hd) + 0x10u +
70                                            balloc->blklen);
71    if (p == NULL) {
72      return NGHTTP3_ERR_NOMEM;
73    }
74
75    hd = (nghttp3_memblock_hd *)(void *)p;
76    hd->next = balloc->head;
77    balloc->head = hd;
78    nghttp3_buf_wrap_init(
79        &balloc->buf,
80        (uint8_t *)(((uintptr_t)p + sizeof(nghttp3_memblock_hd) + 0xfu) &
81                    ~(uintptr_t)0xfu),
82        balloc->blklen);
83  }
84
85  assert(((uintptr_t)balloc->buf.last & 0xfu) == 0);
86
87  *pbuf = balloc->buf.last;
88  balloc->buf.last += (n + 0xfu) & ~(uintptr_t)0xfu;
89
90  return 0;
91}
92