Add Vector::resize()

Bug: 8384764
Change-Id: Icee83d389f3e555eba7d419b64c8d52a9aa21b8b

include/utils/Vector.h

@@ -80,6 +80,12 @@ public:
     //! sets the capacity. capacity can never be reduced less than size()
     inline  ssize_t         setCapacity(size_t size)    { return VectorImpl::setCapacity(size); }
 
+    /*!
+     * set the size of the vector. items are appended with the default
+     * constructor, or removed from the end as needed.
+     */
+    inline  ssize_t         resize(size_t size)         { return VectorImpl::resize(size); }
+
     /*!
      * C-style array access
      */

include/utils/VectorImpl.h

@@ -64,6 +64,7 @@ public:
     inline  bool            isEmpty() const     { return mCount == 0; }
             size_t          capacity() const;
             ssize_t         setCapacity(size_t size);
+            ssize_t         resize(size_t size);
 
             /*! append/insert another vector or array */
             ssize_t         insertVectorAt(const VectorImpl& vector, size_t index);

libs/utils/VectorImpl.cpp

@@ -343,6 +343,16 @@ ssize_t VectorImpl::setCapacity(size_t new_capacity)
     return new_capacity;
 }
 
+ssize_t VectorImpl::resize(size_t size) {
+    ssize_t result = NO_ERROR;
+    if (size > mCount) {
+        result = insertAt(mCount, size - mCount);
+    } else if (size < mCount) {
+        result = removeItemsAt(size, mCount - size);
+    }
+    return result < 0 ? result : size;
+}
+
 void VectorImpl::release_storage()
 {
     if (mStorage) {