From aeb549ef8f4cb939c6dcfb36047712571282f6be Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Tue, 28 Dec 2021 17:38:01 +1100
Subject: [PATCH] Fixed unpacking I;16B to I;16 on big endian

---
 Tests/test_file_png.py | 2 --
 src/libImaging/Pack.c  | 4 ++++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index 9a5577bbac0..0869cc58bc5 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -13,7 +13,6 @@
     assert_image_equal,
     assert_image_equal_tofile,
     hopper,
-    is_big_endian,
     is_win32,
     mark_if_feature_version,
     skip_unless_feature,
@@ -77,7 +76,6 @@ def get_chunks(self, filename):
                     png.crc(cid, s)
         return chunks
 
-    @pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
     def test_sanity(self, tmp_path):
 
         # internal version number
diff --git a/src/libImaging/Pack.c b/src/libImaging/Pack.c
index 2fdee919f6c..0c7c0497efe 100644
--- a/src/libImaging/Pack.c
+++ b/src/libImaging/Pack.c
@@ -656,7 +656,11 @@ static struct {
 
     /* storage modes */
     {"I;16", "I;16", 16, copy2},
+#ifdef WORDS_BIGENDIAN
+    {"I;16", "I;16B", 16, packI16N_I16},
+#else
     {"I;16", "I;16B", 16, packI16N_I16B},
+#endif
     {"I;16B", "I;16B", 16, copy2},
     {"I;16L", "I;16L", 16, copy2},
     {"I;16", "I;16N", 16, packI16N_I16},  // LibTiff native->image endian.