core/util: MemoryMap learns to materialize in files

Change-Id: I003168d3718491524db91b9f7d855d6b3428961c

src/core/util/MemoryMap.cc

@@ -0,0 +1,45 @@
+#include <fstream>
+#include <string>
+#include <sstream>
+#include "MemoryMap.hpp"
+
+namespace fail {
+
+bool MemoryMap::readFromFile(char const * const filename)
+{
+	std::ifstream file(filename);
+	if (!file.is_open()) {
+		return false;
+	}
+
+	std::string buf;
+	unsigned guest_addr, guest_len;
+	unsigned count = 0;
+
+	while (getline(file, buf)) {
+		std::stringstream ss(buf, std::ios::in);
+		ss >> guest_addr >> guest_len;
+		add(guest_addr, guest_len);
+		count++;
+	}
+	// assertion kept from original code; usually something's fishy if the file
+	// contains no entries
+	assert(count > 0);
+	return true;
+}
+
+bool MemoryMap::writeToFile(char const * const filename)
+{
+	std::ofstream file(filename);
+	if (!file.is_open()) {
+		return false;
+	}
+
+	for (iterator it = begin(); it != end(); ++it) {
+		file << *it << "\t1\n";
+	}
+
+	return true;
+}
+
+}