X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fbuffer-view.h;fp=src%2Fcommon%2Fbuffer-view.h;h=7d03b41dd1bb80ece8ad109ddd8e40a898e37921;hp=0000000000000000000000000000000000000000;hb=01dc0eed91e5c7db3f12beda894cb3d9cc7a4fa1;hpb=5966417eba59c9014c1f67ae37257e7266e647b5

diff --git a/src/common/buffer-view.h b/src/common/buffer-view.h
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+++ b/src/common/buffer-view.h
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+/*
+ * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef LTTNG_BUFFER_VIEW_H
+#define LTTNG_BUFFER_VIEW_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct lttng_dynamic_buffer;
+
+struct lttng_buffer_view {
+	const char *data;
+	size_t size;
+};
+
+/**
+ * Return a buffer view referencing a subset of the memory referenced by another
+ * view.
+ *
+ * @src		Source view to reference
+ * @offset	Offset to apply to the source memory content
+ * @len		Length of the memory contents to reference. Passing -1 will
+ *		cause the view to reference the whole view from the offset
+ *		provided.
+ *
+ * Note that a buffer view never assumes the ownership of the memory it
+ * references.
+ */
+struct lttng_buffer_view lttng_buffer_view_from_view(
+		const struct lttng_buffer_view *src, size_t offset,
+		ptrdiff_t len);
+
+/**
+ * Return a buffer view referencing a subset of the memory referenced by a
+ * dynamic buffer.
+ *
+ * @src		Source dynamic buffer to reference
+ * @offset	Offset to apply to the source memory content
+ * @len		Length of the memory contents to reference. Passing -1 will
+ *		cause the view to reference the whole dynamic buffer from the
+ *		offset provided.
+ *
+ * Note that a buffer view never assumes the ownership of the memory it
+ * references.
+ */
+struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
+		const struct lttng_dynamic_buffer *src, size_t offset,
+		ptrdiff_t len);
+
+#endif /* LTTNG_BUFFER_VIEW_H */