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01dc0eed JG |
1 | /* |
2 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
11 | * for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public License | |
14 | * along with this program; if not, write to the Free Software Foundation, | |
15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
18 | #include <common/buffer-view.h> | |
19 | #include <common/dynamic-buffer.h> | |
20 | #include <common/macros.h> | |
21 | #include <common/error.h> | |
22 | #include <assert.h> | |
23 | ||
24 | struct lttng_buffer_view lttng_buffer_view_from_view( | |
25 | const struct lttng_buffer_view *src, size_t offset, | |
26 | ptrdiff_t len) | |
27 | { | |
28 | struct lttng_buffer_view view = { .data = NULL, .size = 0 }; | |
29 | ||
30 | assert(src); | |
31 | ||
32 | if (offset > src->size) { | |
33 | ERR("Attempt to create buffer view with invalid offset"); | |
34 | goto end; | |
35 | } | |
36 | ||
37 | if (len != -1 && len > (src->size - offset)) { | |
38 | ERR("Attempt to create buffer view with invalid length"); | |
39 | goto end; | |
40 | } | |
41 | ||
42 | view.data = src->data + offset; | |
43 | view.size = len == -1 ? (src->size - offset) : len; | |
44 | end: | |
45 | return view; | |
46 | } | |
47 | ||
48 | struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer( | |
49 | const struct lttng_dynamic_buffer *src, size_t offset, | |
50 | ptrdiff_t len) | |
51 | { | |
52 | struct lttng_buffer_view view = { .data = NULL, .size = 0 }; | |
53 | ||
54 | assert(src); | |
55 | ||
56 | if (offset > src->size) { | |
57 | ERR("Attempt to create buffer view with invalid offset"); | |
58 | goto end; | |
59 | } | |
60 | ||
61 | if (len != -1 && len > (src->size - offset)) { | |
62 | ERR("Attempt to create buffer view with invalid length"); | |
63 | goto end; | |
64 | } | |
65 | ||
66 | view.data = src->data + offset; | |
67 | view.size = len == -1 ? (src->size - offset) : len; | |
68 | end: | |
69 | return view; | |
70 | } |