Support packing I;16N

Author: radarhere

Tests/test_lib_pack.py

@@ -207,6 +207,9 @@ def test_I(self):
                 0x01000083,
             )
 
+    def test_I16(self):
+        self.assert_pack("I;16N", "I;16N", 2, 0x0201, 0x0403, 0x0605)
+
     def test_F_float(self):
         self.assert_pack("F", "F;32F", 4, 1.539989614439558e-36, 4.063216068939723e-34)
 

src/libImaging/Pack.c

@@ -664,6 +664,7 @@ static struct {
 #endif
     {"I;16B", "I;16B", 16, copy2},
     {"I;16L", "I;16L", 16, copy2},
+    {"I;16N", "I;16N", 16, copy2},
     {"I;16", "I;16N", 16, packI16N_I16},  // LibTiff native->image endian.
     {"I;16L", "I;16N", 16, packI16N_I16},
     {"I;16B", "I;16N", 16, packI16N_I16B},