From b04a8778e9a31bfee8c647df5f1e440d66e534a9 Mon Sep 17 00:00:00 2001
From: Richard Hughes <richard@hughsie.com>
Date: Wed, 23 May 2018 20:46:28 +0100
Subject: [PATCH] trivial: Add helper function for parsing a uint4 buffer

---
 plugins/dfu/dfu-common.c | 20 ++++++++++++++++++++
 plugins/dfu/dfu-common.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/plugins/dfu/dfu-common.c b/plugins/dfu/dfu-common.c
index 5037e2ff0..aeb5acc0b 100644
--- a/plugins/dfu/dfu-common.c
+++ b/plugins/dfu/dfu-common.c
@@ -212,6 +212,26 @@ dfu_utils_bytes_is_empty (GBytes *bytes)
 	return TRUE;
 }
 
+/**
+ * dfu_utils_buffer_parse_uint4:
+ * @data: a string
+ *
+ * Parses a base 16 number from a string.
+ *
+ * The string MUST be at least 1 byte long as this function cannot check the
+ * length of @data. Checking the size must be done in the caller.
+ *
+ * Return value: A parsed value, or 0 for error
+ **/
+guint8
+dfu_utils_buffer_parse_uint4 (const gchar *data)
+{
+	gchar buffer[2];
+	memcpy (buffer, data, 1);
+	buffer[1] = '\0';
+	return (guint8) g_ascii_strtoull (buffer, NULL, 16);
+}
+
 /**
  * dfu_utils_buffer_parse_uint8:
  * @data: a string
diff --git a/plugins/dfu/dfu-common.h b/plugins/dfu/dfu-common.h
index c72b316db..d8d292e98 100644
--- a/plugins/dfu/dfu-common.h
+++ b/plugins/dfu/dfu-common.h
@@ -173,6 +173,7 @@ const gchar	*dfu_version_to_string			(DfuVersion	 version);
 /* helpers */
 GBytes		*dfu_utils_bytes_join_array		(GPtrArray	*chunks);
 gboolean	 dfu_utils_bytes_is_empty		(GBytes		*bytes);
+guint8		 dfu_utils_buffer_parse_uint4		(const gchar	*data);
 guint8		 dfu_utils_buffer_parse_uint8		(const gchar	*data);
 guint16		 dfu_utils_buffer_parse_uint16		(const gchar	*data);
 guint32		 dfu_utils_buffer_parse_uint24		(const gchar	*data);