--- /dev/null
+/* Copyright (c) 2014-2018. The SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#ifndef SIMGRID_MC_CHUNKED_DATA_HPP
+#define SIMGRID_MC_CHUNKED_DATA_HPP
+
+#include <cstddef>
+#include <cstdint>
+
+#include <utility>
+#include <vector>
+
+#include "src/mc/mc_forward.hpp"
+#include "src/mc/sosp/PageStore.hpp"
+
+namespace simgrid {
+namespace mc {
+
+/** A byte-string represented as a sequence of chunks from a PageStore
+ *
+ * In order to save memory when taking memory snapshots, a given byte-string
+ * is split in fixed-size chunks. Identical chunks (either from the same
+ * snapshot or more probably from different snpashots) share the same memory
+ * storage.
+ *
+ * Thus a chunked is represented as a sequence of indices of each chunk.
+ */
+class ChunkedData {
+ /** This is where we store the chunks */
+ PageStore* store_ = nullptr;
+ /** Indices of the chunks in the `PageStore` */
+ std::vector<std::size_t> pagenos_;
+
+public:
+ ChunkedData() = default;
+ void clear()
+ {
+ for (std::size_t const& pageno : pagenos_)
+ store_->unref_page(pageno);
+ pagenos_.clear();
+ }
+ ~ChunkedData() { clear(); }
+
+ // Copy and move
+ ChunkedData(ChunkedData const& that) : store_(that.store_), pagenos_(that.pagenos_)
+ {
+ for (std::size_t const& pageno : pagenos_)
+ store_->ref_page(pageno);
+ }
+ ChunkedData(ChunkedData&& that) : store_(that.store_), pagenos_(std::move(that.pagenos_))
+ {
+ that.store_ = nullptr;
+ that.pagenos_.clear();
+ }
+ ChunkedData& operator=(ChunkedData const& that)
+ {
+ this->clear();
+ store_ = that.store_;
+ pagenos_ = that.pagenos_;
+ for (std::size_t const& pageno : pagenos_)
+ store_->ref_page(pageno);
+ return *this;
+ }
+ ChunkedData& operator=(ChunkedData&& that)
+ {
+ this->clear();
+ store_ = that.store_;
+ that.store_ = nullptr;
+ pagenos_ = std::move(that.pagenos_);
+ that.pagenos_.clear();
+ return *this;
+ }
+
+ /** How many pages are used */
+ std::size_t page_count() const { return pagenos_.size(); }
+
+ /** Get a chunk index */
+ std::size_t pageno(std::size_t i) const { return pagenos_[i]; }
+
+ /** Get a view of the chunk indices */
+ const std::size_t* pagenos() const { return pagenos_.data(); }
+
+ /** Get a a pointer to a chunk */
+ const void* page(std::size_t i) const { return store_->get_page(pagenos_[i]); }
+
+ ChunkedData(PageStore& store, AddressSpace& as, RemotePtr<void> addr, std::size_t page_count);
+};
+
+} // namespace mc
+} // namespace simgrid
+
+#endif
