diff --git a/include/patty/buffer.h b/include/patty/buffer.h
index def1b6b..307c95b 100644
--- a/include/patty/buffer.h
+++ b/include/patty/buffer.h
@@ -1,13 +1,17 @@
 #ifndef _PATTY_BUFFER_H
 #define _PATTY_BUFFER_H
 
+#include <sys/types.h>
+
 typedef struct _patty_buffer patty_buffer;
 
 patty_buffer *patty_buffer_new(size_t size);
 
 void patty_buffer_destroy(patty_buffer *buffer);
 
-void *patty_buffer_data(patty_buffer *buffer);
+size_t patty_buffer_size(patty_buffer *buffer);
+
+void *patty_buffer_data(patty_buffer *buffer, size_t *len);
 
 ssize_t patty_buffer_fill(patty_buffer *buffer, void *data, size_t len);
 
diff --git a/src/buffer.c b/src/buffer.c
index 9d0f1bc..ccc69c0 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -39,7 +39,13 @@ void patty_buffer_destroy(patty_buffer *buffer) {
     free(buffer);
 }
 
-void *patty_buffer_data(patty_buffer *buffer) {
+size_t patty_buffer_size(patty_buffer *buffer) {
+    return buffer->size;
+}
+
+void *patty_buffer_data(patty_buffer *buffer, size_t *len) {
+    *len = buffer->len;
+
     return buffer->data;
 }