From f38cbce65319b7d5fa3c004d840dc36fead40f75 Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Sun, 12 Aug 2018 19:53:53 +0200
Subject: [PATCH] shared: add nm_utils_gbytes_equal_mem() util

---
 shared/nm-utils/nm-shared-utils.c | 30 ++++++++++++++++++++++++++++++
 shared/nm-utils/nm-shared-utils.h |  4 ++++
 2 files changed, 34 insertions(+)

diff --git a/shared/nm-utils/nm-shared-utils.c b/shared/nm-utils/nm-shared-utils.c
index 25661eaa7c..b8f95f3d62 100644
--- a/shared/nm-utils/nm-shared-utils.c
+++ b/shared/nm-utils/nm-shared-utils.c
@@ -117,6 +117,36 @@ nm_utils_strbuf_append (char **buf, gsize *len, const char *format, ...)
 
 /*****************************************************************************/
 
+/**
+ * nm_utils_gbytes_equals:
+ * @bytes: (allow-none): a #GBytes array to compare. Note that
+ *   %NULL is treated like an #GBytes array of length zero.
+ * @mem_data: the data pointer with @mem_len bytes
+ * @mem_len: the length of the data pointer
+ *
+ * Returns: %TRUE if @bytes contains the same data as @mem_data. As a
+ *   special case, a %NULL @bytes is treated like an empty array.
+ */
+gboolean
+nm_utils_gbytes_equal_mem (GBytes *bytes,
+                           gconstpointer mem_data,
+                           gsize mem_len)
+{
+	gconstpointer p;
+	gsize l;
+
+	if (!bytes) {
+		/* as a special case, let %NULL GBytes compare idential
+		 * to an empty array. */
+		return (mem_len == 0);
+	}
+
+	p = g_bytes_get_data (bytes, &l);
+	return    l == mem_len
+	       && (   mem_len == 0 /* allow @mem_data to be %NULL */
+	           || memcmp (p, mem_data, mem_len) == 0);
+}
+
 GVariant *
 nm_utils_gbytes_to_variant_ay (GBytes *bytes)
 {
diff --git a/shared/nm-utils/nm-shared-utils.h b/shared/nm-utils/nm-shared-utils.h
index a85497e854..26875534d9 100644
--- a/shared/nm-utils/nm-shared-utils.h
+++ b/shared/nm-utils/nm-shared-utils.h
@@ -202,6 +202,10 @@ nm_utils_is_separator (const char c)
 
 /*****************************************************************************/
 
+gboolean nm_utils_gbytes_equal_mem (GBytes *bytes,
+                                    gconstpointer mem_data,
+                                    gsize mem_len);
+
 GVariant *nm_utils_gbytes_to_variant_ay (GBytes *bytes);
 
 /*****************************************************************************/