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diff -ruN a/codecs/jpeg2000.cc b/codecs/jpeg2000.cc
--- a/codecs/jpeg2000.cc	2017-07-21 10:19:01.000000000 -0400
+++ b/codecs/jpeg2000.cc	2020-08-08 05:16:24.680041474 -0400
@@ -67,14 +67,14 @@
   return stream;
 }
 
-static int cpp_jas_read (jas_stream_obj_t* obj, char* buf, int cnt)
+static int cpp_jas_read (jas_stream_obj_t* obj, char* buf, unsigned int cnt)
 {
   std::istream* stream = (std::istream*) obj;
   stream->read (buf, cnt);
   return cnt;
 }
 
-static int cpp_jas_write (jas_stream_obj_t* obj, char* buf, int cnt)
+static int cpp_jas_write (jas_stream_obj_t* obj, char* buf, unsigned int cnt)
 {
   std::ostream* stream = (std::ostream*) obj;
   stream->write (buf, cnt);