1 /*
2 * nghttp3
3 *
4 * Copyright (c) 2019 nghttp3 contributors
5 * Copyright (c) 2017 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_buf.h"
27
nghttp3_buf_init(nghttp3_buf * buf)28 void nghttp3_buf_init(nghttp3_buf *buf) {
29 buf->begin = buf->end = buf->pos = buf->last = NULL;
30 }
31
nghttp3_buf_wrap_init(nghttp3_buf * buf,uint8_t * src,size_t len)32 void nghttp3_buf_wrap_init(nghttp3_buf *buf, uint8_t *src, size_t len) {
33 buf->begin = buf->pos = buf->last = src;
34 buf->end = buf->begin + len;
35 }
36
nghttp3_buf_free(nghttp3_buf * buf,const nghttp3_mem * mem)37 void nghttp3_buf_free(nghttp3_buf *buf, const nghttp3_mem *mem) {
38 nghttp3_mem_free(mem, buf->begin);
39 }
40
nghttp3_buf_left(const nghttp3_buf * buf)41 size_t nghttp3_buf_left(const nghttp3_buf *buf) {
42 return (size_t)(buf->end - buf->last);
43 }
44
nghttp3_buf_len(const nghttp3_buf * buf)45 size_t nghttp3_buf_len(const nghttp3_buf *buf) {
46 return (size_t)(buf->last - buf->pos);
47 }
48
nghttp3_buf_cap(const nghttp3_buf * buf)49 size_t nghttp3_buf_cap(const nghttp3_buf *buf) {
50 return (size_t)(buf->end - buf->begin);
51 }
52
nghttp3_buf_reset(nghttp3_buf * buf)53 void nghttp3_buf_reset(nghttp3_buf *buf) { buf->pos = buf->last = buf->begin; }
54
nghttp3_buf_reserve(nghttp3_buf * buf,size_t size,const nghttp3_mem * mem)55 int nghttp3_buf_reserve(nghttp3_buf *buf, size_t size, const nghttp3_mem *mem) {
56 uint8_t *p;
57 nghttp3_ssize pos_offset, last_offset;
58
59 if ((size_t)(buf->end - buf->begin) >= size) {
60 return 0;
61 }
62
63 pos_offset = buf->pos - buf->begin;
64 last_offset = buf->last - buf->begin;
65
66 p = nghttp3_mem_realloc(mem, buf->begin, size);
67 if (p == NULL) {
68 return NGHTTP3_ERR_NOMEM;
69 }
70
71 buf->begin = p;
72 buf->end = p + size;
73 buf->pos = p + pos_offset;
74 buf->last = p + last_offset;
75
76 return 0;
77 }
78
nghttp3_buf_swap(nghttp3_buf * a,nghttp3_buf * b)79 void nghttp3_buf_swap(nghttp3_buf *a, nghttp3_buf *b) {
80 nghttp3_buf c = *a;
81
82 *a = *b;
83 *b = c;
84 }
85
nghttp3_typed_buf_init(nghttp3_typed_buf * tbuf,const nghttp3_buf * buf,nghttp3_buf_type type)86 void nghttp3_typed_buf_init(nghttp3_typed_buf *tbuf, const nghttp3_buf *buf,
87 nghttp3_buf_type type) {
88 tbuf->buf = *buf;
89 tbuf->type = type;
90 }
91