add nfc binding

Change-Id: I1ebf8e803436430490201db533c2a5a04c04295e
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>

1 files changed, 41 insertions, 0 deletions

diff --git a/src/stringutils.h b/src/stringutils.h
new file mode 100644
index 0000000..824d09d
--- /dev/null
+++ b/src/stringutils.h
@@ -0,0 +1,41 @@
+#pragma once
+
+#include <stdlib.h>
+
+/**
+ * @brief Get a hexadecimal string representation from memory buffer.
+ * @param[in] src Buffer's pointer.
+ * @param[in] sz Buffer's size.
+ * @return A pointer to the result string. Caller is responsible for the result lifetime.
+ */
+static inline char* to_hex_string(const void* src, long unsigned int sz)
+{
+	static const char lookup[] =
+	{
+		'0', '1', '2', '3',
+		'4', '5', '6', '7',
+		'8', '9', 'a', 'b',
+		'c', 'd', 'e', 'f'
+	};
+
+	const char* source;
+	char* result;
+	long unsigned int i;
+
+	result = NULL;
+	if (src && sz)
+	{
+		source = (const char*)src;
+		result = (char*)malloc(sz * 2 + 1);
+		if (result)
+		{
+			result[sz * 2] = 0;
+			for (i = 0; i < sz; ++i)
+			{
+				result[i * 2] = lookup[(source[i] & 0xf0) >> 4];
+				result[i * 2 + 1] = lookup[source[i] & 0x0f];
+			}
+		}
+	}
+	return result;
+}