RTF Formatter: replaced surrogate pair calculation with util.

1 files changed, 3 insertions, 8 deletions

diff --git a/pygments/formatters/rtf.py b/pygments/formatters/rtf.py
index b6a60df3..cf65a927 100644
--- a/pygments/formatters/rtf.py
+++ b/pygments/formatters/rtf.py
@@ -10,7 +10,7 @@
 """
 
 from pygments.formatter import Formatter
-from pygments.util import get_int_opt
+from pygments.util import get_int_opt, _surrogatepair
 
 
 __all__ = ['RtfFormatter']
@@ -90,13 +90,8 @@ class RtfFormatter(Formatter):
                 buf.append(r'{\u%d}' % cn)
             elif (2**16) <= cn:
                 # RTF limits unicode to 16 bits.
-                # Given a unicode character code
-                # with length greater than 16 bits,
-                # print the two 16 bit surrogate pair.
-                # From example D28 of:
-                # http://www.unicode.org/book/ch03.pdf
-                h = ((cn - 0x10000) / 0x400) + 0xD800
-                l = ((cn - 0x10000) % 0x400) + 0xDC00
+                # Force surrogate pairs
+                h,l = _surrogatepair(cn)
                 buf.append(r'{\u%d}{\u%d}' % (h,l))
 
         return ''.join(buf).replace('\n', '\\par\n')