X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fbuffer-view.c;fp=src%2Fcommon%2Fbuffer-view.c;h=8ff1539919a8f7140a7a2ac25780a6fcf323e5ea;hp=0000000000000000000000000000000000000000;hb=01dc0eed91e5c7db3f12beda894cb3d9cc7a4fa1;hpb=5966417eba59c9014c1f67ae37257e7266e647b5

diff --git a/src/common/buffer-view.c b/src/common/buffer-view.c
new file mode 100644
index 000000000..8ff153991
--- /dev/null
+++ b/src/common/buffer-view.c
@@ -0,0 +1,70 @@
+/*
+ * 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
+ */
+
+#include <common/buffer-view.h>
+#include <common/dynamic-buffer.h>
+#include <common/macros.h>
+#include <common/error.h>
+#include <assert.h>
+
+struct lttng_buffer_view lttng_buffer_view_from_view(
+		const struct lttng_buffer_view *src, size_t offset,
+		ptrdiff_t len)
+{
+	struct lttng_buffer_view view = { .data = NULL, .size = 0 };
+
+	assert(src);
+
+	if (offset > src->size) {
+		ERR("Attempt to create buffer view with invalid offset");
+		goto end;
+	}
+
+	if (len != -1 && len > (src->size - offset)) {
+		ERR("Attempt to create buffer view with invalid length");
+		goto end;
+	}
+
+	view.data = src->data + offset;
+	view.size = len == -1 ? (src->size - offset) : len;
+end:
+	return view;
+}
+
+struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
+		const struct lttng_dynamic_buffer *src, size_t offset,
+		ptrdiff_t len)
+{
+	struct lttng_buffer_view view = { .data = NULL, .size = 0 };
+
+	assert(src);
+
+	if (offset > src->size) {
+		ERR("Attempt to create buffer view with invalid offset");
+		goto end;
+	}
+
+	if (len != -1 && len > (src->size - offset)) {
+		ERR("Attempt to create buffer view with invalid length");
+		goto end;
+	}
+
+	view.data = src->data + offset;
+	view.size = len == -1 ? (src->size - offset) : len;
+end:
+	return view;
+}