core/util: MemoryMap learns to materialize in files

Change-Id: I003168d3718491524db91b9f7d855d6b3428961c

src/core/util/CMakeLists.txt

@@ -17,6 +17,7 @@ set(SRCS
  gzstream/gzstream.h
  Logger.cc
  Logger.hpp
+ MemoryMap.cc
  MemoryMap.hpp
  ProtoStream.cc
  ProtoStream.hpp

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;
+}
+
+}

src/core/util/MemoryMap.hpp

@@ -73,6 +73,24 @@ public:
 	 * structure.
 	 */
 	iterator end() { return as.end(); }
+	/**
+	 * Loads a memory map from a file and merges it with the current state.
+	 *
+	 * File format (addresses and sizes in decimal):
+	 * \code
+	 * address1<tab>size1
+	 * address2<tab>size2
+	 * ...
+	 * \endcode
+	 */
+	bool readFromFile(char const * const filename);
+	/**
+	 * Saves the map to a file.
+	 *
+	 * Currently all access size information is lost; the map is flattened out
+	 * to a long list of single-byte addresses.
+	 */
+	bool writeToFile(char const * const filename);
 };
 
 } // end-of-namespace: fail