xref: /third_party/nghttp2/lib/nghttp2_rcbuf.c (revision 2c593315) 
1/*
2 * nghttp2 - HTTP/2 C Library
3 *
4 * Copyright (c) 2016 Tatsuhiro Tsujikawa
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25#include "nghttp2_rcbuf.h"
26
27#include <string.h>
28#include <assert.h>
29
30#include "nghttp2_mem.h"
31#include "nghttp2_helper.h"
32
33int nghttp2_rcbuf_new(nghttp2_rcbuf **rcbuf_ptr, size_t size,
34                      nghttp2_mem *mem) {
35  uint8_t *p;
36
37  p = nghttp2_mem_malloc(mem, sizeof(nghttp2_rcbuf) + size);
38  if (p == NULL) {
39    return NGHTTP2_ERR_NOMEM;
40  }
41
42  *rcbuf_ptr = (void *)p;
43
44  (*rcbuf_ptr)->mem_user_data = mem->mem_user_data;
45  (*rcbuf_ptr)->free = mem->free;
46  (*rcbuf_ptr)->base = p + sizeof(nghttp2_rcbuf);
47  (*rcbuf_ptr)->len = size;
48  (*rcbuf_ptr)->ref = 1;
49
50  return 0;
51}
52
53int nghttp2_rcbuf_new2(nghttp2_rcbuf **rcbuf_ptr, const uint8_t *src,
54                       size_t srclen, nghttp2_mem *mem) {
55  int rv;
56
57  rv = nghttp2_rcbuf_new(rcbuf_ptr, srclen + 1, mem);
58  if (rv != 0) {
59    return rv;
60  }
61
62  (*rcbuf_ptr)->len = srclen;
63  *nghttp2_cpymem((*rcbuf_ptr)->base, src, srclen) = '\0';
64
65  return 0;
66}
67
68/*
69 * Frees |rcbuf| itself, regardless of its reference cout.
70 */
71void nghttp2_rcbuf_del(nghttp2_rcbuf *rcbuf) {
72  nghttp2_mem_free2(rcbuf->free, rcbuf, rcbuf->mem_user_data);
73}
74
75void nghttp2_rcbuf_incref(nghttp2_rcbuf *rcbuf) {
76  if (rcbuf->ref == -1) {
77    return;
78  }
79
80  ++rcbuf->ref;
81}
82
83void nghttp2_rcbuf_decref(nghttp2_rcbuf *rcbuf) {
84  if (rcbuf == NULL || rcbuf->ref == -1) {
85    return;
86  }
87
88  assert(rcbuf->ref > 0);
89
90  if (--rcbuf->ref == 0) {
91    nghttp2_rcbuf_del(rcbuf);
92  }
93}
94
95nghttp2_vec nghttp2_rcbuf_get_buf(nghttp2_rcbuf *rcbuf) {
96  nghttp2_vec res = {rcbuf->base, rcbuf->len};
97  return res;
98}
99
100int nghttp2_rcbuf_is_static(const nghttp2_rcbuf *rcbuf) {
101  return rcbuf->ref == -1;
102}
103