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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 | #ifndef LTTNG_BUFFER_VIEW_H | |
19 | #define LTTNG_BUFFER_VIEW_H | |
20 | ||
21 | #include <stddef.h> | |
22 | #include <stdint.h> | |
23 | ||
24 | struct lttng_dynamic_buffer; | |
25 | ||
26 | struct lttng_buffer_view { | |
27 | const char *data; | |
28 | size_t size; | |
29 | }; | |
30 | ||
31 | /** | |
32 | * Return a buffer view referencing a subset of the memory referenced by another | |
33 | * view. | |
34 | * | |
35 | * @src Source view to reference | |
36 | * @offset Offset to apply to the source memory content | |
37 | * @len Length of the memory contents to reference. Passing -1 will | |
38 | * cause the view to reference the whole view from the offset | |
39 | * provided. | |
40 | * | |
41 | * Note that a buffer view never assumes the ownership of the memory it | |
42 | * references. | |
43 | */ | |
44 | struct lttng_buffer_view lttng_buffer_view_from_view( | |
45 | const struct lttng_buffer_view *src, size_t offset, | |
46 | ptrdiff_t len); | |
47 | ||
48 | /** | |
49 | * Return a buffer view referencing a subset of the memory referenced by a | |
50 | * dynamic buffer. | |
51 | * | |
52 | * @src Source dynamic buffer to reference | |
53 | * @offset Offset to apply to the source memory content | |
54 | * @len Length of the memory contents to reference. Passing -1 will | |
55 | * cause the view to reference the whole dynamic buffer from the | |
56 | * offset provided. | |
57 | * | |
58 | * Note that a buffer view never assumes the ownership of the memory it | |
59 | * references. | |
60 | */ | |
61 | struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer( | |
62 | const struct lttng_dynamic_buffer *src, size_t offset, | |
63 | ptrdiff_t len); | |
64 | ||
65 | #endif /* LTTNG_BUFFER_VIEW_H */ |