Index: src/OFMutableData.h
==================================================================
--- src/OFMutableData.h
+++ src/OFMutableData.h
@@ -40,10 +40,22 @@
  * Modifying the returned array directly is allowed and will change the contents
  * of the data.
  */
 @property (readonly, nonatomic) void *mutableItems OF_RETURNS_INNER_POINTER;
 
+/*!
+ * @brief The first item of the OFMutableData or `NULL`.
+ */
+@property OF_NULLABLE_PROPERTY (readonly, nonatomic) void *mutableFirstItem
+    OF_RETURNS_INNER_POINTER;
+
+/*!
+ * @brief The last item of the OFMutableData or `NULL`.
+ */
+@property OF_NULLABLE_PROPERTY (readonly, nonatomic) void *mutableLastItem
+    OF_RETURNS_INNER_POINTER;
+
 /*!
  * @brief Creates a new OFMutableData with an item size of 1.
  *
  * @return A new autoreleased OFMutableData
  */

Index: src/OFMutableData.m
==================================================================
--- src/OFMutableData.m
+++ src/OFMutableData.m
@@ -152,10 +152,26 @@
 	if (idx >= _count)
 		@throw [OFOutOfRangeException exception];
 
 	return _items + idx * _itemSize;
 }
+
+- (void *)mutableFirstItem
+{
+	if (_items == NULL || _count == 0)
+		return NULL;
+
+	return _items;
+}
+
+- (void *)mutableLastItem
+{
+	if (_items == NULL || _count == 0)
+		return NULL;
+
+	return _items + (_count - 1) * _itemSize;
+}
 
 - (OFData *)subdataWithRange: (of_range_t)range
 {
 	if (range.length > SIZE_MAX - range.location ||
 	    range.location + range.length > _count)