dolphin/Source/Core/VideoCommon/DataReader.h

// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <cstring>

#include "Common/Common.h"
#include "Common/CommonTypes.h"
#include "Common/Swap.h"

class DataReader
{
public:
  __forceinline DataReader() : buffer(nullptr), end(nullptr) {}
  __forceinline DataReader(u8* src, u8* _end) : buffer(src), end(_end) {}
  __forceinline u8* GetPointer() { return buffer; }
  __forceinline u8* operator=(u8* src)
  {
    buffer = src;
    return src;
  }

  __forceinline size_t size() { return end - buffer; }
  template <typename T, bool swapped = true>
  __forceinline T Peek(int offset = 0)
  {
    T data;
    std::memcpy(&data, &buffer[offset], sizeof(T));

    if (swapped)
      data = Common::FromBigEndian(data);

    return data;
  }

  template <typename T, bool swapped = true>
  __forceinline T Read()
  {
    const T result = Peek<T, swapped>();
    buffer += sizeof(T);
    return result;
  }

  template <typename T, bool swapped = false>
  __forceinline void Write(T data)
  {
    if (swapped)
      data = Common::FromBigEndian(data);

    std::memcpy(buffer, &data, sizeof(T));
    buffer += sizeof(T);
  }

  template <typename T = u8>
  __forceinline void Skip(size_t data = 1)
  {
    buffer += sizeof(T) * data;
  }

private:
  u8* __restrict buffer;
  u8* end;
};