added function to read from disk into (OpenCL) buffer

libdevcore/CommonIO.cpp

@@ -75,6 +75,23 @@ bytesRef dev::contentsNew(std::string const& _file)
 	return ret;
 }
 
+// Don't forget to delete[] later.
+uint64_t dev::contentsToBuffer(std::string const& _file, void * buf)
+{
+	std::ifstream is(_file, std::ifstream::binary);
+	if (!is)
+		return 0;
+	// get length of file:
+	is.seekg(0, is.end);
+	streamoff length = is.tellg();
+	if (length == 0) // return early, MSVC does not like reading 0 bytes
+		return 0;
+	is.seekg(0, is.beg);
+	is.read((char*)buf, length);
+	is.close();
+	return (uint64_t)length;
+}
+
 bytes dev::contents(std::string const& _file)
 {
 	std::ifstream is(_file, std::ifstream::binary);

libdevcore/CommonIO.h

@@ -48,6 +48,10 @@ std::string contentsString(std::string const& _file);
 /// Retrieve and returns the allocated contents of the given file. If the file doesn't exist or isn't readable, returns nullptr. Don't forget to delete [] when finished.
 bytesRef contentsNew(std::string const& _file);
 
+/// Retrieve and returns the allocated contents of the given file and load into buffer. Used to fill mapped OpenCL buffer. 
+uint64_t contentsToBuffer(std::string const& _file, void * buf);
+
+
 /// Write the given binary data into the given file, replacing the file if it pre-exists.
 void writeFile(std::string const& _file, bytesConstRef _data);
 /// Write the given binary data into the given file, replacing the file if it pre-exists.