libknot: add interface for manipulation with binary data with base64 conversion

refs #2353

Knot.files

@@ -8,6 +8,8 @@ KNOWN_ISSUES
 README
 tests/querytcp.c
 src/libknot/libknot.h
+src/libknot/binary.h
+src/libknot/binary.c
 src/libknot/common.h
 src/libknot/dname.h
 src/libknot/dname.c

src/Makefile.am

@@ -188,6 +188,8 @@ libknot_la_SOURCES =				\
 	libknot/tsig.c				\
 	libknot/tsig-op.h			\
 	libknot/tsig-op.c			\
+	libknot/binary.h			\
+	libknot/binary.c			\
 	libknot/sign/key.h			\
 	libknot/sign/key.c
 

src/libknot/binary.c

@@ -14,4 +14,41 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <stdlib.h>
+#include <string.h>
+
 #include "binary.h"
+#include "common/base64.h"
+#include "common/errcode.h"
+
+int knot_binary_from_base64(const char *base64, knot_binary_t *binary)
+{
+	if (!binary)
+		return KNOT_EINVAL;
+
+	uint8_t *data;
+	int32_t size;
+
+	size = base64_decode_alloc((uint8_t *)base64, strlen(base64), &data);
+	if (size < 0)
+		return KNOT_ENOMEM;
+
+	binary->data = data;
+	binary->size = size;
+
+	return KNOT_EOK;
+}
+
+int knot_binary_free(knot_binary_t *binary)
+{
+	if (!binary)
+		return KNOT_EINVAL;
+
+	if (binary->data) {
+		free(binary->data);
+		binary->data = NULL;
+		binary->size = 0;
+	}
+
+	return KNOT_EOK;
+}

src/libknot/binary.h

@@ -28,4 +28,21 @@ struct knot_binary {
 
 typedef struct knot_binary knot_binary_t;
 
+/*!
+ * \brief Initialize knot_binary_t structure from Base64 encoded string.
+ *
+ * \param base64    Base64 encoded input data.
+ * \param binary    Pointer to structure to write the result into.
+ * \return          Error code, KNOT_EOK in case of success.
+ */
+int knot_binary_from_base64(const char *base64, knot_binary_t *binary);
+
+/*!
+ * \brief Free content of knot_binary_t structure.
+ *
+ * \param binary    Pointer to the structure.
+ * \return          Error code, KNOT_EOK in case of success.
+ */
+int knot_binary_free(knot_binary_t *binary);
+
 #endif // _KNOT_BINARY_H