| 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 "payload-view.hpp" |
| 9 | #include "payload.hpp" |
| 10 | |
| 11 | #include <common/buffer-view.hpp> |
| 12 | #include <common/dynamic-array.hpp> |
| 13 | |
| 14 | #include <stddef.h> |
| 15 | |
| 16 | bool lttng_payload_view_is_valid(const struct lttng_payload_view *view) |
| 17 | { |
| 18 | return view && lttng_buffer_view_is_valid(&view->buffer); |
| 19 | } |
| 20 | |
| 21 | struct lttng_payload_view |
| 22 | lttng_payload_view_from_payload(const struct lttng_payload *payload, size_t offset, ptrdiff_t len) |
| 23 | { |
| 24 | return payload ? |
| 25 | (struct lttng_payload_view){ |
| 26 | .buffer = lttng_buffer_view_from_dynamic_buffer( |
| 27 | &payload->buffer, offset, len), |
| 28 | ._fd_handles = payload->_fd_handles, |
| 29 | ._iterator = {}, |
| 30 | } : |
| 31 | (struct lttng_payload_view){ |
| 32 | .buffer = {}, |
| 33 | ._fd_handles = {}, |
| 34 | ._iterator = {}, |
| 35 | }; |
| 36 | } |
| 37 | |
| 38 | struct lttng_payload_view |
| 39 | lttng_payload_view_from_view(struct lttng_payload_view *view, size_t offset, ptrdiff_t len) |
| 40 | { |
| 41 | return view ? (struct lttng_payload_view) { |
| 42 | .buffer = lttng_buffer_view_from_view( |
| 43 | &view->buffer, offset, len), |
| 44 | ._fd_handles = view->_fd_handles, |
| 45 | ._iterator = { |
| 46 | .p_fd_handles_position = view->_iterator.p_fd_handles_position ?: |
| 47 | &view->_iterator.fd_handles_position, |
| 48 | .fd_handles_position = 0, |
| 49 | } |
| 50 | } : (struct lttng_payload_view) { |
| 51 | .buffer = {}, |
| 52 | ._fd_handles = {}, |
| 53 | ._iterator = {}, |
| 54 | }; |
| 55 | } |
| 56 | |
| 57 | struct lttng_payload_view lttng_payload_view_from_dynamic_buffer( |
| 58 | const struct lttng_dynamic_buffer *buffer, size_t offset, ptrdiff_t len) |
| 59 | { |
| 60 | return buffer ? |
| 61 | (struct lttng_payload_view){ |
| 62 | .buffer = lttng_buffer_view_from_dynamic_buffer(buffer, offset, len), |
| 63 | ._fd_handles = {}, |
| 64 | ._iterator = {}, |
| 65 | } : |
| 66 | (struct lttng_payload_view){ |
| 67 | .buffer = {}, |
| 68 | ._fd_handles = {}, |
| 69 | ._iterator = {}, |
| 70 | }; |
| 71 | } |
| 72 | |
| 73 | struct lttng_payload_view lttng_payload_view_from_buffer_view(const struct lttng_buffer_view *view, |
| 74 | size_t offset, |
| 75 | ptrdiff_t len) |
| 76 | { |
| 77 | return view ? |
| 78 | (struct lttng_payload_view){ |
| 79 | .buffer = lttng_buffer_view_from_view(view, offset, len), |
| 80 | ._fd_handles = {}, |
| 81 | ._iterator = {}, |
| 82 | } : |
| 83 | (struct lttng_payload_view){ |
| 84 | .buffer = {}, |
| 85 | ._fd_handles = {}, |
| 86 | ._iterator = {}, |
| 87 | }; |
| 88 | } |
| 89 | |
| 90 | struct lttng_payload_view |
| 91 | lttng_payload_view_init_from_buffer(const char *src, size_t offset, ptrdiff_t len) |
| 92 | { |
| 93 | return (struct lttng_payload_view){ |
| 94 | .buffer = lttng_buffer_view_init(src, offset, len), |
| 95 | ._fd_handles = {}, |
| 96 | ._iterator = {}, |
| 97 | }; |
| 98 | } |
| 99 | |
| 100 | int lttng_payload_view_get_fd_handle_count(const struct lttng_payload_view *payload_view) |
| 101 | { |
| 102 | int ret; |
| 103 | size_t position; |
| 104 | |
| 105 | if (!payload_view) { |
| 106 | ret = -1; |
| 107 | goto end; |
| 108 | } |
| 109 | |
| 110 | ret = lttng_dynamic_pointer_array_get_count(&payload_view->_fd_handles); |
| 111 | if (ret < 0) { |
| 112 | goto end; |
| 113 | } |
| 114 | |
| 115 | position = payload_view->_iterator.p_fd_handles_position ? |
| 116 | *payload_view->_iterator.p_fd_handles_position : |
| 117 | payload_view->_iterator.fd_handles_position; |
| 118 | ret = ret - (int) position; |
| 119 | end: |
| 120 | return ret; |
| 121 | } |
| 122 | |
| 123 | struct fd_handle *lttng_payload_view_pop_fd_handle(struct lttng_payload_view *view) |
| 124 | { |
| 125 | struct fd_handle *handle = nullptr; |
| 126 | size_t fd_handle_count; |
| 127 | size_t *pos; |
| 128 | |
| 129 | if (!view) { |
| 130 | goto end; |
| 131 | } |
| 132 | |
| 133 | fd_handle_count = lttng_payload_view_get_fd_handle_count(view); |
| 134 | if (fd_handle_count == 0) { |
| 135 | goto end; |
| 136 | } |
| 137 | |
| 138 | pos = view->_iterator.p_fd_handles_position ? view->_iterator.p_fd_handles_position : |
| 139 | &view->_iterator.fd_handles_position; |
| 140 | handle = (fd_handle *) lttng_dynamic_pointer_array_get_pointer(&view->_fd_handles, *pos); |
| 141 | (*pos)++; |
| 142 | fd_handle_get(handle); |
| 143 | end: |
| 144 | return handle; |
| 145 | } |