Support unpacking I;16N

Author: radarhere

Tests/test_lib_pack.py

@@ -764,10 +764,12 @@ def test_I16(self):
             self.assert_unpack("I;16", "I;16N", 2, 0x0201, 0x0403, 0x0605)
             self.assert_unpack("I;16B", "I;16N", 2, 0x0201, 0x0403, 0x0605)
             self.assert_unpack("I;16L", "I;16N", 2, 0x0201, 0x0403, 0x0605)
+            self.assert_unpack("I;16N", "I;16N", 2, 0x0201, 0x0403, 0x0605)
         else:
             self.assert_unpack("I;16", "I;16N", 2, 0x0102, 0x0304, 0x0506)
             self.assert_unpack("I;16B", "I;16N", 2, 0x0102, 0x0304, 0x0506)
             self.assert_unpack("I;16L", "I;16N", 2, 0x0102, 0x0304, 0x0506)
+            self.assert_unpack("I;16N", "I;16N", 2, 0x0102, 0x0304, 0x0506)
 
     def test_CMYK16(self):
         self.assert_unpack("CMYK", "CMYK;16L", 8, (2, 4, 6, 8), (10, 12, 14, 16))

src/libImaging/Unpack.c

@@ -1762,6 +1762,7 @@ static struct {
     {"I;16", "I;16", 16, copy2},
     {"I;16B", "I;16B", 16, copy2},
     {"I;16L", "I;16L", 16, copy2},
+    {"I;16N", "I;16N", 16, copy2},
 
     {"I;16", "I;16N", 16, unpackI16N_I16},   // LibTiff native->image endian.
     {"I;16L", "I;16N", 16, unpackI16N_I16},  // LibTiff native->image endian.