From: Ondřej Surý <ondrej@isc.org>
Date: Fri, 16 Dec 2022 10:43:20 +0000 (+0100)
Subject: Add isc_buffer_trycompact() function needed for StreamDNS
X-Git-Tag: v9.19.9~69^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=460afcda183c6348e03ea6f8830821cadf0d3665;p=thirdparty%2Fbind9.git

Add isc_buffer_trycompact() function needed for StreamDNS

Add isc_buffer_trycompact() that's an optimization; it will compact the
buffer only when the remaining length is smaller than used length.
---

diff --git a/lib/isc/include/isc/buffer.h b/lib/isc/include/isc/buffer.h
index 2877d211791..16df98dc28a 100644
--- a/lib/isc/include/isc/buffer.h
+++ b/lib/isc/include/isc/buffer.h
@@ -265,6 +265,8 @@ isc_buffer_reinit(isc_buffer_t *b, void *base, unsigned int length);
  *
  */
 
+static inline void
+isc_buffer_trycompact(isc_buffer_t *b);
 static inline void
 isc_buffer_compact(isc_buffer_t *b);
 /*!<
@@ -1043,6 +1045,13 @@ isc_buffer_reinit(isc_buffer_t *b, void *base, unsigned int length) {
 	b->length = length;
 }
 
+static inline void
+isc_buffer_trycompact(isc_buffer_t *b) {
+	if (isc_buffer_consumedlength(b) >= isc_buffer_remaininglength(b)) {
+		isc_buffer_compact(b);
+	}
+}
+
 static inline void
 isc_buffer_compact(isc_buffer_t *b) {
 	unsigned int length;