[BL] FileTools; Add createBinaryFile with check.

BaseLib/FileTools.cpp

@@ -13,6 +13,7 @@
  */
 
 #include "FileTools.h"
+#include "Error.h"
 #include "StringTools.h"
 
 #include <sys/stat.h>
@@ -56,6 +57,16 @@ void truncateFile( std::string const& filename)
     ofs.close();
 }
 
+std::ofstream createBinaryFile(std::string const& file_name)
+{
+    std::ofstream os(file_name, std::ios::binary);
+    if (!os)
+    {
+        OGS_FATAL("Could not open file '%s' for output.", file_name.c_str());
+    }
+    return os;
+}
+
 namespace
 {
 

BaseLib/FileTools.h

@@ -97,6 +97,13 @@ std::vector<T> readBinaryArray(std::string const& filename, std::size_t const n)
     return std::vector<T>();
 }
 
+/**
+ * Create a binary file for output.
+ *
+ * Wrapper around the std::ofstream constructor with error checking.
+ */
+std::ofstream createBinaryFile(std::string const& file_name);
+
 /**
  * \brief truncate a file
  *