From 4e513a3346fb647f49fdbf9849328fcc8c691a54 Mon Sep 17 00:00:00 2001
From: Dimitrios Katsaros <patcherwork@gmail.com>
Date: Sun, 14 Aug 2016 22:17:55 +0200
Subject: [PATCH] Imgcodecs: Fixed a bug with checkSignature in GdalDecoder

In cases where the signaure string contains a terminating character,
the std::string member function size returns a smaller value than the
allocated string. In these cases, if you then try to use substr,
you will get an out_of_range exception. This patch remedies the problem.
---
 modules/imgcodecs/src/grfmt_gdal.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/imgcodecs/src/grfmt_gdal.cpp b/modules/imgcodecs/src/grfmt_gdal.cpp
index 1094b91b38..8865ae4948 100644
--- a/modules/imgcodecs/src/grfmt_gdal.cpp
+++ b/modules/imgcodecs/src/grfmt_gdal.cpp
@@ -559,7 +559,7 @@ bool GdalDecoder::checkSignature( const String& signature )const{
 
 
     // look for NITF
-    std::string str = signature.c_str();
+    std::string str(signature);
     if( str.substr(0,4).find("NITF") != std::string::npos ){
         return true;
     }