From: Peter Lieven <p...@kamp.de>
This makes sure the number of reallocs is in O(log N).
Signed-off-by: Peter Lieven <p...@kamp.de>
[ rebased to io/buffer.c ]
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
io/buffer.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/io/buffer.c b/io/buffer.c
index 68ae68d..6aa06e7 100644
--- a/io/buffer.c
+++ b/io/buffer.c
@@ -20,10 +20,13 @@
#include "io/buffer.h"
+#define QIO_BUFFER_MIN_INIT_SIZE 4096
+
void qio_buffer_reserve(QIOBuffer *buffer, size_t len)
{
if ((buffer->capacity - buffer->offset) < len) {
- buffer->capacity += (len + 1024);
+ buffer->capacity = pow2ceil(buffer->offset + len);
+ buffer->capacity = MAX(buffer->capacity, QIO_BUFFER_MIN_INIT_SIZE);
buffer->buffer = g_realloc(buffer->buffer, buffer->capacity);
}
}
--
1.8.3.1
