From 40dc0bcd6395193d5b859bf28b3f4bd459311ad7 Mon Sep 17 00:00:00 2001
From: Brian Armstrong <brian.armstrong@discordapp.com>
Date: Mon, 24 Apr 2017 18:03:59 -0700
Subject: [PATCH] fix ByteStreamBuffer

---
 modules/imgcodecs/src/loadsave.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/modules/imgcodecs/src/loadsave.cpp b/modules/imgcodecs/src/loadsave.cpp
index 4ceccd196e..6b15dbe3d6 100644
--- a/modules/imgcodecs/src/loadsave.cpp
+++ b/modules/imgcodecs/src/loadsave.cpp
@@ -70,21 +70,21 @@ protected:
                               std::ios_base::seekdir dir,
                               std::ios_base::openmode )
     {
-        // get absolute offset
-        off_type off = offset;
+        char* whence = eback();
         if (dir == std::ios_base::cur)
         {
-            off += gptr() - eback();
+            whence = gptr();
         }
         else if (dir == std::ios_base::end)
         {
-            off += egptr() - eback();
+            whence = egptr();
         }
+        char* to = whence + offset;
 
         // check limits
-        if (off >= (off_type)0 && off <= egptr() - eback())
+        if (to >= eback() && to <= egptr())
         {
-            setg(eback(), gptr() + off, egptr());
+            setg(eback(), to, egptr());
             return gptr() - eback();
         }