From a848dad40aa618e5e24417e4ef46b62c860de679 Mon Sep 17 00:00:00 2001
From: Pawel Maslanka <pmaslank@akamai.com>
Date: Mon, 29 Mar 2021 22:45:21 +0200
Subject: BMP protocol support

Initial implementation of a basic subset of the BMP (BGP Monitoring
Protocol, RFC 7854) from Akamai team. Submitted for further review
and improvement.
---
 proto/bmp/buffer.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 proto/bmp/buffer.c

(limited to 'proto/bmp/buffer.c')

diff --git a/proto/bmp/buffer.c b/proto/bmp/buffer.c
new file mode 100644
index 00000000..f471e08a
--- /dev/null
+++ b/proto/bmp/buffer.c
@@ -0,0 +1,58 @@
+/*
+ *	BIRD -- The BGP Monitoring Protocol (BMP)
+ *
+ *	(c) 2020 Akamai Technologies, Inc. (Pawel Maslanka, pmaslank@akamai.com)
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include "proto/bmp/buffer.h"
+
+buffer
+bmp_buffer_alloc(pool *ppool, const size_t n)
+{
+  buffer buf;
+  buf.start = mb_alloc(ppool, n);
+  buf.pos = buf.start;
+  buf.end = buf.start + n;
+
+  return buf;
+}
+
+void
+bmp_buffer_free(buffer *buf)
+{
+  mb_free(buf->start);
+  buf->start = buf->pos = buf->end = NULL;
+}
+
+static void
+bmp_buffer_grow(buffer *buf, const size_t n)
+{
+  const size_t pos = bmp_buffer_pos(buf);
+  buf->start = mb_realloc(buf->start, n);
+  buf->pos = buf->start + pos;
+  buf->end = buf->start + n;
+}
+
+void
+bmp_buffer_need(buffer *buf, const size_t n)
+{
+  if (bmp_buffer_avail(buf) < n)
+  {
+    bmp_buffer_grow(buf, n);
+  }
+}
+
+void
+bmp_put_data(buffer *buf, const void *src, const size_t n)
+{
+  if (!n)
+  {
+    return;
+  }
+
+  bmp_buffer_need(buf, n);
+  memcpy(buf->pos, src, n);
+  buf->pos += n;
+}
\ No newline at end of file
-- 
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