Repo created

libs/coding/memory_region.hpp

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+#pragma once
+
+#include "coding/files_container.hpp"
+
+#include "base/macros.hpp"
+
+#include <cstdint>
+#include <utility>
+#include <vector>
+
+class MemoryRegion
+{
+public:
+  virtual ~MemoryRegion() = default;
+
+  virtual uint64_t Size() const = 0;
+  virtual uint8_t const * ImmutableData() const = 0;
+};
+
+class MappedMemoryRegion : public MemoryRegion
+{
+public:
+  explicit MappedMemoryRegion(FilesMappingContainer::Handle && handle) : m_handle(std::move(handle)) {}
+
+  // MemoryRegion overrides:
+  uint64_t Size() const override { return m_handle.GetSize(); }
+  uint8_t const * ImmutableData() const override { return m_handle.GetData<uint8_t>(); }
+
+private:
+  FilesMappingContainer::Handle m_handle;
+
+  DISALLOW_COPY(MappedMemoryRegion);
+};
+
+class CopiedMemoryRegion : public MemoryRegion
+{
+public:
+  explicit CopiedMemoryRegion(std::vector<uint8_t> && buffer) : m_buffer(std::move(buffer)) {}
+
+  // MemoryRegion overrides:
+  uint64_t Size() const override { return m_buffer.size(); }
+  uint8_t const * ImmutableData() const override { return m_buffer.data(); }
+
+  uint8_t * MutableData() { return m_buffer.data(); }
+
+private:
+  std::vector<uint8_t> m_buffer;
+
+  DISALLOW_COPY(CopiedMemoryRegion);
+};