common: compile libcommon as C++

[lttng-tools.git] / src / common / payload-view.cpp

diff --git a/src/common/payload-view.cpp b/src/common/payload-view.cpp
new file mode 100644 (file)
index 0000000..b1a4436
--- /dev/null
+++ b/src/common/payload-view.cpp
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#include <common/dynamic-array.h>
+#include <common/buffer-view.h>
+#include "payload-view.h"
+#include "payload.h"
+#include <stddef.h>
+
+bool lttng_payload_view_is_valid(const struct lttng_payload_view *view)
+{
+       return view && lttng_buffer_view_is_valid(&view->buffer);
+}
+
+struct lttng_payload_view lttng_payload_view_from_payload(
+               const struct lttng_payload *payload, size_t offset,
+               ptrdiff_t len)
+{
+       return payload ? (struct lttng_payload_view) {
+               .buffer = lttng_buffer_view_from_dynamic_buffer(
+                       &payload->buffer, offset, len),
+               ._fd_handles = payload->_fd_handles,
+               } : (struct lttng_payload_view) {};
+}
+
+struct lttng_payload_view lttng_payload_view_from_view(
+               struct lttng_payload_view *view, size_t offset,
+               ptrdiff_t len)
+{
+       return view ? (struct lttng_payload_view) {
+               .buffer = lttng_buffer_view_from_view(
+                               &view->buffer, offset, len),
+               ._fd_handles = view->_fd_handles,
+               ._iterator = {
+                       .p_fd_handles_position = view->_iterator.p_fd_handles_position ?:
+                               &view->_iterator.fd_handles_position,
+               }
+       } : (struct lttng_payload_view) {};
+}
+
+struct lttng_payload_view lttng_payload_view_from_dynamic_buffer(
+               const struct lttng_dynamic_buffer *buffer, size_t offset,
+               ptrdiff_t len)
+{
+       return buffer ? (struct lttng_payload_view) {
+               .buffer = lttng_buffer_view_from_dynamic_buffer(
+                       buffer, offset, len)
+               } : (struct lttng_payload_view) {};
+}
+
+struct lttng_payload_view lttng_payload_view_from_buffer_view(
+               const struct lttng_buffer_view *view, size_t offset,
+               ptrdiff_t len)
+{
+       return view ? (struct lttng_payload_view) {
+               .buffer = lttng_buffer_view_from_view(
+                       view, offset, len)
+               } : (struct lttng_payload_view) {};
+}
+
+struct lttng_payload_view lttng_payload_view_init_from_buffer(
+       const char *src, size_t offset, ptrdiff_t len)
+{
+       return (struct lttng_payload_view) {
+               .buffer = lttng_buffer_view_init(
+                       src, offset, len)
+       };
+}
+
+int lttng_payload_view_get_fd_handle_count(
+               const struct lttng_payload_view *payload_view)
+{
+       int ret;
+       size_t position;
+
+       if (!payload_view) {
+               ret = -1;
+               goto end;
+       }
+
+       ret = lttng_dynamic_pointer_array_get_count(&payload_view->_fd_handles);
+       if (ret < 0) {
+               goto end;
+       }
+
+       position = payload_view->_iterator.p_fd_handles_position ?
+                       *payload_view->_iterator.p_fd_handles_position :
+                       payload_view->_iterator.fd_handles_position;
+       ret = ret - (int) position;
+end:
+       return ret;
+}
+
+struct fd_handle *lttng_payload_view_pop_fd_handle(
+               struct lttng_payload_view *view)
+{
+       struct fd_handle *handle = NULL;
+       size_t fd_handle_count;
+       size_t *pos;
+
+       if (!view) {
+               goto end;
+       }
+
+       fd_handle_count = lttng_payload_view_get_fd_handle_count(view);
+       if (fd_handle_count == 0) {
+               goto end;
+       }
+
+       pos = view->_iterator.p_fd_handles_position ?
+                       view->_iterator.p_fd_handles_position :
+                       &view->_iterator.fd_handles_position;
+       handle = (fd_handle *) lttng_dynamic_pointer_array_get_pointer(&view->_fd_handles,
+                       *pos);
+       (*pos)++;
+       fd_handle_get(handle);
+end:
+       return handle;
+}