File fix_narrowing.patch of Package openbabel.16873

From e26491017efefdc6aaf73d4d49f284f4e9436244 Mon Sep 17 00:00:00 2001
From: Noel O'Boyle <baoilleach@gmail.com>
Date: Wed, 3 Jan 2018 21:27:53 +0000
Subject: [PATCH] Fix #1689 by using positive values and explicitly stating
 unsigned char

---
 src/formats/pngformat.cpp    | 2 +-
 src/formats/yasaraformat.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/formats/pngformat.cpp b/src/formats/pngformat.cpp
index 49bff17fc..79f8a4902 100644
--- a/src/formats/pngformat.cpp
+++ b/src/formats/pngformat.cpp
@@ -218,7 +218,7 @@ bool PNGFormat::ReadMolecule(OBBase* pOb, OBConversion* pConv)
     _count=0;
     _hasInputPngFile=true;
   }
-  const char pngheader[] = {-119,80,78,71,13,10,26,10,0};
+  const unsigned char pngheader[] = {137,80,78,71,13,10,26,10,0};
   char readbytes[9];
   ifs.read(readbytes, 8);
 
diff --git a/src/formats/yasaraformat.cpp b/src/formats/yasaraformat.cpp
index 25f7d2295..e666d0176 100644
--- a/src/formats/yasaraformat.cpp
+++ b/src/formats/yasaraformat.cpp
@@ -472,7 +472,7 @@ bool YOBFormat::WriteMolecule(OBBase* pOb, OBConversion* pConv)
 
   //  bool hetatom;
   char buffer[32],/*resname[4],*/atomname[5];
-  char double1[8]={0,0,0,0,0,0,-16,0x3f};
+  unsigned char double1[8]={0,0,0,0,0,0,0xf0,0x3f};
   //   char *str;
   int i,j,/*m,q,*/pos;
   int /*resno,chainNum,link,linktype,*/atoms,element,links/*,chain*/;