[vt] fix for crash when creating VtArray from large python buffer

pxr/base/vt/arrayPyBuffer.cpp

@@ -416,12 +416,12 @@ Vt_ArrayFromBuffer(TfPyObjWrapper const &obj,
     // Check that the number of elements matches.
     auto multiply = [](Py_ssize_t x, Py_ssize_t y) { return x * y; };
     auto numItems = std::accumulate(
-        view.shape, view.shape + view.ndim, 1, multiply);
+        view.shape, view.shape + view.ndim, (Py_ssize_t)1, multiply);
 
     // Compute the total # of items in one element.
     auto elemShape = Vt_GetElementShape<T>();
     auto elemSize = std::accumulate(
-        elemShape.begin(), elemShape.end(), 1, multiply);
+        elemShape.begin(), elemShape.end(), (Py_ssize_t)1, multiply);
 
     // Sanity check data sizes.
     auto arraySize = numItems / elemSize;

pxr/base/vt/testenv/testVtArray.py

@@ -25,6 +25,8 @@
 # pylint: disable=range-builtin-not-iterating
 #
 from __future__ import division
+
+import array
 import unittest
 import sys, math
 from pxr import Gf, Vt
@@ -157,10 +159,10 @@ def test_Overflows(self):
         for arrayType, (x0, x1) in overflows:
             for x in (x0, x1):
                 with self.assertRaises(OverflowError):
-                    array = arrayType((x,))
+                    arrayT = arrayType((x,))
             for x in (x0+1, x1-1):
-                array = arrayType((x,))
-                self.assertEqual(array, eval(repr(array)))
+                arrayT = arrayType((x,))
+                self.assertEqual(arrayT, eval(repr(arrayT)))
 
     def test_ParallelizedOps(self):
         m0 = Vt.Matrix4dArray((Gf.Matrix4d(1),Gf.Matrix4d(2)))
@@ -357,6 +359,14 @@ def _TestDivision(ArrayType, QuatType, ImgType):
         _TestDivision(Vt.QuatdArray, Gf.Quatd, Gf.Vec3d)
         _TestDivision(Vt.QuaternionArray, Gf.Quaternion, Gf.Vec3d)
 
+    def test_LargeBuffer(self):
+        '''VtArray can be created from a buffer with item count
+           greater than maxint'''
+        largePyBuffer = array.array('B', (0,)) * 2500000000
+        vtArrayFromBuffer = Vt.UCharArray.FromBuffer(largePyBuffer)
+        self.assertEqual(len(vtArrayFromBuffer), 2500000000)
+
+
 if __name__ == '__main__':
     unittest.main()