1/*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 *
24 * C++ classes for Secure Streams - atomic heap messages
25 */
26
27#include <libwebsockets.hxx>
28#include "private-lib-misc-lwsac.h"
29
30void
31lssAc::start(bool atomic)
32{
33	if (atomic && ac->next) {
34		struct lwsac *ac2 = NULL, *i;
35		size_t total = (size_t)lwsac_total_alloc(ac);
36		uint8_t *p = (uint8_t *)lwsac_use(&ac2, total, total);
37
38		/*
39		 * He wants a single linear buffer, and we have more than one
40		 * piece... let's make a new, single one, copy the fragments
41		 * in and replace the fragmented one with the unified copy.
42		 */
43
44		i = ac;
45		while (i) {
46			size_t bl = lwsac_get_tail_pos(i) -
47						lwsac_sizeof(i == ac);
48			memcpy(p, (uint8_t *)i + lwsac_sizeof(i == ac), bl);
49			p += bl;
50		}
51
52		lwsac_free(&ac);
53		ac = ac2;
54	}
55
56	iter = ac;
57}
58
59int
60lssAc::get(lssbuf_t *lb)
61{
62	if (!ac)
63		return 1;
64
65	lb->buf = (uint8_t *)iter + lwsac_sizeof(iter == ac);
66	lb->len = lwsac_get_tail_pos(iter) - lwsac_sizeof(iter == ac);
67	iter = iter->next;
68
69	return 0;
70}
71
72void
73lssAc::append(lssbuf_t *lb)
74{
75	uint8_t *p = (uint8_t *)lwsac_use(&ac, lb->len, lb->len);
76
77	if (!p)
78		throw lssException("oom");
79	memcpy(p, lb->buf, lb->len);
80}
81