Move IOFile to a separate file

Reduces the number of files that need to be recompiled
when making changes to FileUtil.h.

Source/Core/Common/File.h

@@ -0,0 +1,93 @@
+// Copyright 2008 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <cstddef>
+#include <cstdio>
+#include <string>
+
+#include "Common/CommonTypes.h"
+#include "Common/NonCopyable.h"
+
+namespace File
+{
+// simple wrapper for cstdlib file functions to
+// hopefully will make error checking easier
+// and make forgetting an fclose() harder
+class IOFile : public NonCopyable
+{
+public:
+  IOFile();
+  IOFile(std::FILE* file);
+  IOFile(const std::string& filename, const char openmode[]);
+
+  ~IOFile();
+
+  IOFile(IOFile&& other) noexcept;
+  IOFile& operator=(IOFile&& other) noexcept;
+
+  void Swap(IOFile& other) noexcept;
+
+  bool Open(const std::string& filename, const char openmode[]);
+  bool Close();
+
+  template <typename T>
+  bool ReadArray(T* data, size_t length, size_t* pReadBytes = nullptr)
+  {
+    size_t read_bytes = 0;
+    if (!IsOpen() || length != (read_bytes = std::fread(data, sizeof(T), length, m_file)))
+      m_good = false;
+
+    if (pReadBytes)
+      *pReadBytes = read_bytes;
+
+    return m_good;
+  }
+
+  template <typename T>
+  bool WriteArray(const T* data, size_t length)
+  {
+    if (!IsOpen() || length != std::fwrite(data, sizeof(T), length, m_file))
+      m_good = false;
+
+    return m_good;
+  }
+
+  bool ReadBytes(void* data, size_t length)
+  {
+    return ReadArray(reinterpret_cast<char*>(data), length);
+  }
+
+  bool WriteBytes(const void* data, size_t length)
+  {
+    return WriteArray(reinterpret_cast<const char*>(data), length);
+  }
+
+  bool IsOpen() const { return nullptr != m_file; }
+  // m_good is set to false when a read, write or other function fails
+  bool IsGood() const { return m_good; }
+  explicit operator bool() const { return IsGood() && IsOpen(); }
+  std::FILE* GetHandle() { return m_file; }
+  void SetHandle(std::FILE* file);
+
+  bool Seek(s64 off, int origin);
+  u64 Tell() const;
+  u64 GetSize();
+  bool Resize(u64 size);
+  bool Flush();
+
+  // clear error state
+  void Clear()
+  {
+    m_good = true;
+    std::clearerr(m_file);
+  }
+
+private:
+  std::FILE* m_file;
+  bool m_good;
+};
+
+}  // namespace File