diff --git a/libs/utils/VectorImpl.cpp b/libs/utils/VectorImpl.cpp
index b09c6ca..289c826 100644
--- a/libs/utils/VectorImpl.cpp
+++ b/libs/utils/VectorImpl.cpp
@@ -108,7 +108,7 @@
 
 ssize_t VectorImpl::insertVectorAt(const VectorImpl& vector, size_t index)
 {
-    return insertAt(vector.arrayImpl(), index, vector.size());
+    return insertArrayAt(vector.arrayImpl(), index, vector.size());
 }
 
 ssize_t VectorImpl::appendVector(const VectorImpl& vector)
@@ -116,6 +116,22 @@
     return insertVectorAt(vector, size());
 }
 
+ssize_t VectorImpl::insertArrayAt(const void* array, size_t index, size_t length)
+{
+    if (index > size())
+        return BAD_INDEX;
+    void* where = _grow(index, length);
+    if (where) {
+        _do_copy(where, array, length);
+    }
+    return where ? index : (ssize_t)NO_MEMORY;
+}
+
+ssize_t VectorImpl::appendArray(const void* array, size_t length)
+{
+    return insertArrayAt(array, size(), length);
+}
+
 ssize_t VectorImpl::insertAt(size_t index, size_t numItems)
 {
     return insertAt(0, index, numItems);
@@ -220,9 +236,9 @@
     return add(0);
 }
 
-ssize_t VectorImpl::add(const void* item, size_t numItems)
+ssize_t VectorImpl::add(const void* item)
 {
-    return insertAt(item, size(), numItems);
+    return insertAt(item, size());
 }
 
 ssize_t VectorImpl::replaceAt(size_t index)