From f8e789be8a673d567aed9076df33b378b5021caa Mon Sep 17 00:00:00 2001
From: Genoil <jw@meneer.net>
Date: Fri, 3 Apr 2015 07:45:11 +0200
Subject: [PATCH] added function to read from disk into (OpenCL) buffer

---
 libdevcore/CommonIO.cpp | 17 +++++++++++++++++
 libdevcore/CommonIO.h   |  4 ++++
 2 files changed, 21 insertions(+)

diff --git a/libdevcore/CommonIO.cpp b/libdevcore/CommonIO.cpp
index 46d6e3a6b..12a35c6cb 100644
--- a/libdevcore/CommonIO.cpp
+++ b/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);
diff --git a/libdevcore/CommonIO.h b/libdevcore/CommonIO.h
index f42f449bb..d3f92d3d2 100644
--- a/libdevcore/CommonIO.h
+++ b/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.