From 5c29452a1e0055640015913ba0c932569f2ad7a1 Mon Sep 17 00:00:00 2001
From: David Hull <david.hull@openx.com>
Date: Wed, 13 Feb 2019 00:21:30 +0000
Subject: [PATCH] Fix decoding of "\uDBFF\uDFFF" surrogate pair.

---
 c_src/utf8.c                   | 2 +-
 test/jiffy_04_string_tests.erl | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/c_src/utf8.c b/c_src/utf8.c
index cd0c717..878a4f0 100644
--- a/c_src/utf8.c
+++ b/c_src/utf8.c
@@ -207,7 +207,7 @@ unicode_to_utf8(int c, unsigned char* buf)
         } else {
             return -1;
         }
-    } else if(c < 0x10FFFF) {
+    } else if(c <= 0x10FFFF) {
         buf[0] = (unsigned char) 0xF0 + (c >> 18);
         buf[1] = (unsigned char) 0x80 + ((c >> 12) & 0x3F);
         buf[2] = (unsigned char) 0x80 + ((c >> 6) & 0x3F);
diff --git a/test/jiffy_04_string_tests.erl b/test/jiffy_04_string_tests.erl
index 7cf645d..8c78a1f 100644
--- a/test/jiffy_04_string_tests.erl
+++ b/test/jiffy_04_string_tests.erl
@@ -108,6 +108,10 @@ cases(uescaped) ->
         {
             <<"\"\\uD83D\\uDE0A\"">>,
             <<240, 159, 152, 138>>
+        },
+        {
+            <<"\"\\uDBFF\\uDFFF\"">>,
+            <<244, 143, 191, 191>>
         }
     ];