247ecec0ae46da86d29ea6b5587a43aa460e0d03
[lttng-tools.git] / src / common / payload-view.c
1 /*
2 * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only
5 *
6 */
7
8 #include <common/dynamic-array.h>
9 #include <common/buffer-view.h>
10 #include "payload-view.h"
11 #include "payload.h"
12 #include <stddef.h>
13
14 LTTNG_HIDDEN
15 bool lttng_payload_view_is_valid(const struct lttng_payload_view *view)
16 {
17 return view && lttng_buffer_view_is_valid(&view->buffer);
18 }
19
20 LTTNG_HIDDEN
21 struct lttng_payload_view lttng_payload_view_from_payload(
22 const struct lttng_payload *payload, size_t offset,
23 ptrdiff_t len)
24 {
25 return payload ? (struct lttng_payload_view) {
26 .buffer = lttng_buffer_view_from_dynamic_buffer(
27 &payload->buffer, offset, len),
28 ._fd_handles = payload->_fd_handles,
29 } : (struct lttng_payload_view) {};
30 }
31
32 LTTNG_HIDDEN
33 struct lttng_payload_view lttng_payload_view_from_view(
34 struct lttng_payload_view *view, size_t offset,
35 ptrdiff_t len)
36 {
37 return view ? (struct lttng_payload_view) {
38 .buffer = lttng_buffer_view_from_view(
39 &view->buffer, offset, len),
40 ._fd_handles = view->_fd_handles,
41 ._iterator.p_fd_handles_position = view->_iterator.p_fd_handles_position ?:
42 &view->_iterator.fd_handles_position,
43 } : (struct lttng_payload_view) {};
44 }
45
46 LTTNG_HIDDEN
47 struct lttng_payload_view lttng_payload_view_from_dynamic_buffer(
48 const struct lttng_dynamic_buffer *buffer, size_t offset,
49 ptrdiff_t len)
50 {
51 return buffer ? (struct lttng_payload_view) {
52 .buffer = lttng_buffer_view_from_dynamic_buffer(
53 buffer, offset, len)
54 } : (struct lttng_payload_view) {};
55 }
56
57 LTTNG_HIDDEN
58 struct lttng_payload_view lttng_payload_view_from_buffer_view(
59 const struct lttng_buffer_view *view, size_t offset,
60 ptrdiff_t len)
61 {
62 return view ? (struct lttng_payload_view) {
63 .buffer = lttng_buffer_view_from_view(
64 view, offset, len)
65 } : (struct lttng_payload_view) {};
66 }
67
68 LTTNG_HIDDEN
69 struct lttng_payload_view lttng_payload_view_init_from_buffer(
70 const char *src, size_t offset, ptrdiff_t len)
71 {
72 return (struct lttng_payload_view) {
73 .buffer = lttng_buffer_view_init(
74 src, offset, len)
75 };
76 }
77
78 LTTNG_HIDDEN
79 int lttng_payload_view_get_fd_handle_count(
80 const struct lttng_payload_view *payload_view)
81 {
82 int ret;
83 size_t position;
84
85 if (!payload_view) {
86 ret = -1;
87 goto end;
88 }
89
90 ret = lttng_dynamic_pointer_array_get_count(&payload_view->_fd_handles);
91 if (ret < 0) {
92 goto end;
93 }
94
95 position = payload_view->_iterator.p_fd_handles_position ?
96 *payload_view->_iterator.p_fd_handles_position :
97 payload_view->_iterator.fd_handles_position;
98 ret = ret - (int) position;
99 end:
100 return ret;
101 }
102
103 LTTNG_HIDDEN
104 struct fd_handle *lttng_payload_view_pop_fd_handle(
105 struct lttng_payload_view *view)
106 {
107 struct fd_handle *handle = NULL;
108 size_t fd_handle_count;
109 size_t *pos;
110
111 if (!view) {
112 goto end;
113 }
114
115 fd_handle_count = lttng_payload_view_get_fd_handle_count(view);
116 if (fd_handle_count == 0) {
117 goto end;
118 }
119
120 pos = view->_iterator.p_fd_handles_position ?
121 view->_iterator.p_fd_handles_position :
122 &view->_iterator.fd_handles_position;
123 handle = lttng_dynamic_pointer_array_get_pointer(&view->_fd_handles,
124 *pos);
125 (*pos)++;
126 fd_handle_get(handle);
127 end:
128 return handle;
129 }
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