| 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 | struct lttng_payload_view lttng_payload_view_from_payload( |
| 16 | const struct lttng_payload *payload, size_t offset, |
| 17 | ptrdiff_t len) |
| 18 | { |
| 19 | return (struct lttng_payload_view) { |
| 20 | .buffer = lttng_buffer_view_from_dynamic_buffer( |
| 21 | &payload->buffer, offset, len), |
| 22 | ._fds = payload->_fds, |
| 23 | }; |
| 24 | } |
| 25 | |
| 26 | LTTNG_HIDDEN |
| 27 | struct lttng_payload_view lttng_payload_view_from_view( |
| 28 | struct lttng_payload_view *view, size_t offset, |
| 29 | ptrdiff_t len) |
| 30 | { |
| 31 | return (struct lttng_payload_view) { |
| 32 | .buffer = lttng_buffer_view_from_view( |
| 33 | &view->buffer, offset, len), |
| 34 | ._fds = view->_fds, |
| 35 | ._iterator.p_fds_position = &view->_iterator.fds_position, |
| 36 | }; |
| 37 | } |
| 38 | |
| 39 | LTTNG_HIDDEN |
| 40 | struct lttng_payload_view lttng_payload_view_from_dynamic_buffer( |
| 41 | const struct lttng_dynamic_buffer *buffer, size_t offset, |
| 42 | ptrdiff_t len) |
| 43 | { |
| 44 | return (struct lttng_payload_view) { |
| 45 | .buffer = lttng_buffer_view_from_dynamic_buffer( |
| 46 | buffer, offset, len) |
| 47 | }; |
| 48 | } |
| 49 | |
| 50 | LTTNG_HIDDEN |
| 51 | struct lttng_payload_view lttng_payload_view_from_buffer_view( |
| 52 | const struct lttng_buffer_view *view, size_t offset, |
| 53 | ptrdiff_t len) |
| 54 | { |
| 55 | return (struct lttng_payload_view) { |
| 56 | .buffer = lttng_buffer_view_from_view( |
| 57 | view, offset, len) |
| 58 | }; |
| 59 | } |
| 60 | |
| 61 | LTTNG_HIDDEN |
| 62 | int lttng_payload_view_get_fd_count(struct lttng_payload_view *payload_view) |
| 63 | { |
| 64 | int ret; |
| 65 | size_t position; |
| 66 | |
| 67 | if (!payload_view) { |
| 68 | ret = -1; |
| 69 | goto end; |
| 70 | } |
| 71 | |
| 72 | ret = lttng_dynamic_array_get_count(&payload_view->_fds); |
| 73 | if (ret < 0) { |
| 74 | goto end; |
| 75 | } |
| 76 | |
| 77 | position = payload_view->_iterator.p_fds_position ? |
| 78 | *payload_view->_iterator.p_fds_position : |
| 79 | payload_view->_iterator.fds_position; |
| 80 | ret = ret - (int) position; |
| 81 | end: |
| 82 | return ret; |
| 83 | } |
| 84 | |
| 85 | LTTNG_HIDDEN |
| 86 | int lttng_payload_view_pop_fd(struct lttng_payload_view *view) |
| 87 | { |
| 88 | int ret = 0; |
| 89 | size_t fd_count; |
| 90 | size_t *pos; |
| 91 | |
| 92 | if (!view) { |
| 93 | ret = -1; |
| 94 | goto end; |
| 95 | } |
| 96 | |
| 97 | fd_count = lttng_dynamic_array_get_count(&view->_fds); |
| 98 | pos = view->_iterator.p_fds_position ? view->_iterator.p_fds_position : |
| 99 | &view->_iterator.fds_position; |
| 100 | |
| 101 | if (*pos >= fd_count) { |
| 102 | ret = -1; |
| 103 | goto end; |
| 104 | } |
| 105 | |
| 106 | ret = *((int *) lttng_dynamic_array_get_element( |
| 107 | &view->_fds, *pos)); |
| 108 | (*pos)++; |
| 109 | end: |
| 110 | return ret; |
| 111 | } |