Repo created

libs/coding/internal/file_data.hpp

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+#pragma once
+
+#include "base/macros.hpp"
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <string>
+
+namespace base
+{
+class FileData
+{
+public:
+  /// @note Do not change order (@see FileData::FileData).
+  enum class Op
+  {
+    READ = 0,
+    WRITE_TRUNCATE,
+    WRITE_EXISTING,
+    APPEND
+  };
+
+  FileData(std::string const & fileName, Op op);
+  ~FileData();
+
+  uint64_t Size() const;
+  uint64_t Pos() const;
+
+  void Seek(uint64_t pos);
+
+  void Read(uint64_t pos, void * p, size_t size);
+  void Write(void const * p, size_t size);
+
+  void Flush();
+  void Truncate(uint64_t sz);
+
+  std::string const & GetName() const { return m_FileName; }
+
+private:
+  FILE * m_File;
+  std::string const m_FileName;
+  Op const m_Op;
+
+  std::string GetErrorProlog() const;
+
+  DISALLOW_COPY(FileData);
+};
+
+bool GetFileSize(std::string const & fName, uint64_t & sz);
+bool DeleteFileX(std::string const & fName);
+bool RenameFileX(std::string const & fOld, std::string const & fNew);
+
+/// Write to temp file and rename it to dest. Delete temp on failure.
+/// @param write function that writes to file with a given name, returns true on success.
+bool WriteToTempAndRenameToFile(std::string const & dest, std::function<bool(std::string const &)> const & write,
+                                std::string const & tmp = "");
+
+void AppendFileToFile(std::string const & fromFilename, std::string const & toFilename);
+
+/// @return false if copy fails. DOES NOT THROWS exceptions
+bool CopyFileX(std::string const & fOld, std::string const & fNew);
+/// @return false if moving fails. DOES NOT THROW exceptions
+bool MoveFileX(std::string const & fOld, std::string const & fNew);
+bool IsEqualFiles(std::string const & firstFile, std::string const & secondFile);
+
+std::vector<uint8_t> ReadFile(std::string const & filePath);
+
+}  // namespace base