Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
Reviewed-by: Peter Lieven <p...@kamp.de>
---
include/qemu/buffer.h | 10 ++++++++++
util/buffer.c | 14 ++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/include/qemu/buffer.h b/include/qemu/buffer.h
index 0710e16..f53ee9e 100644
--- a/include/qemu/buffer.h
+++ b/include/qemu/buffer.h
@@ -127,4 +127,14 @@ uint8_t *buffer_end(Buffer *buffer);
*/
gboolean buffer_empty(Buffer *buffer);
+/**
+ * buffer_move_empty:
+ * @to: destination buffer object
+ * @from: source buffer object
+ *
+ * Moves buffer, without copying data. 'to' buffer must be empty.
+ * 'from' buffer is empty and zero-sized on return.
+ */
+void buffer_move_empty(Buffer *to, Buffer *from);
+
#endif /* QEMU_BUFFER_H__ */
diff --git a/util/buffer.c b/util/buffer.c
index 12bf2d7..c7a39ec 100644
--- a/util/buffer.c
+++ b/util/buffer.c
@@ -77,3 +77,17 @@ void buffer_advance(Buffer *buffer, size_t len)
(buffer->offset - len));
buffer->offset -= len;
}
+
+void buffer_move_empty(Buffer *to, Buffer *from)
+{
+ assert(to->offset == 0);
+
+ g_free(to->buffer);
+ to->offset = from->offset;
+ to->capacity = from->capacity;
+ to->buffer = from->buffer;
+
+ from->offset = 0;
+ from->capacity = 0;
+ from->buffer = NULL;
+}
--
1.8.3.1
