From ff003bfbcc9cfd7d281030f836616c0cdd59cfa6 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Sun, 30 Apr 2023 14:49:40 +1000
Subject: [PATCH] Added unpacker from I;16B to I;16

---
 Tests/test_lib_pack.py  |  1 +
 src/libImaging/Unpack.c | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/Tests/test_lib_pack.py b/Tests/test_lib_pack.py
index de3e7d156..f7812f62b 100644
--- a/Tests/test_lib_pack.py
+++ b/Tests/test_lib_pack.py
@@ -757,6 +757,7 @@ class TestLibUnpack:
 
     def test_I16(self):
         self.assert_unpack("I;16", "I;16", 2, 0x0201, 0x0403, 0x0605)
+        self.assert_unpack("I;16", "I;16B", 2, 0x0102, 0x0304, 0x0506)
         self.assert_unpack("I;16B", "I;16B", 2, 0x0102, 0x0304, 0x0506)
         self.assert_unpack("I;16L", "I;16L", 2, 0x0201, 0x0403, 0x0605)
         self.assert_unpack("I;16", "I;12", 2, 0x0010, 0x0203, 0x0040)
diff --git a/src/libImaging/Unpack.c b/src/libImaging/Unpack.c
index 7eeadf944..a0fa22c7d 100644
--- a/src/libImaging/Unpack.c
+++ b/src/libImaging/Unpack.c
@@ -1149,6 +1149,16 @@ unpackI16N_I16(UINT8 *out, const UINT8 *in, int pixels) {
     }
 }
 static void
+unpackI16B_I16(UINT8 *out, const UINT8 *in, int pixels) {
+    int i;
+    for (i = 0; i < pixels; i++) {
+        out[0] = in[1];
+        out[1] = in[0];
+        in += 2;
+        out += 2;
+    }
+}
+static void
 unpackI16R_I16(UINT8 *out, const UINT8 *in, int pixels) {
     int i;
     for (i = 0; i < pixels; i++) {
@@ -1764,6 +1774,7 @@ static struct {
     {"I;16L", "I;16L", 16, copy2},
     {"I;16N", "I;16N", 16, copy2},
 
+    {"I;16", "I;16B", 16, unpackI16B_I16},
     {"I;16", "I;16N", 16, unpackI16N_I16},   // LibTiff native->image endian.
     {"I;16L", "I;16N", 16, unpackI16N_I16},  // LibTiff native->image endian.
     {"I;16B", "I;16N", 16, unpackI16N_I16B},