dolphin/Source/Core/DiscIO/TGCBlob.h

// Copyright 2016 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <array>
#include <memory>
#include <utility>

#include "Common/CommonTypes.h"
#include "Common/File.h"
#include "DiscIO/Blob.h"

namespace DiscIO
{
static constexpr u32 TGC_MAGIC = 0xA2380FAE;

struct TGCHeader
{
  u32 magic;
  u32 unknown_1;
  u32 tgc_header_size;
  u32 disc_header_area_size;

  u32 fst_real_offset;
  u32 fst_size;
  u32 fst_max_size;
  u32 dol_real_offset;

  u32 dol_size;
  u32 file_area_real_offset;
  u32 unknown_2;
  u32 unknown_3;

  u32 unknown_4;
  u32 file_area_virtual_offset;
};

class TGCFileReader final : public BlobReader
{
public:
  static std::unique_ptr<TGCFileReader> Create(File::IOFile file);

  BlobType GetBlobType() const override { return BlobType::TGC; }

  u64 GetRawSize() const override { return m_size; }
  u64 GetDataSize() const override;
  bool IsDataSizeAccurate() const override { return true; }

  u64 GetBlockSize() const override { return 0; }
  bool HasFastRandomAccessInBlock() const override { return true; }
  std::string GetCompressionMethod() const override { return {}; }

  bool Read(u64 offset, u64 nbytes, u8* out_ptr) override;

private:
  TGCFileReader(File::IOFile file);

  bool InternalRead(u64 offset, u64 nbytes, u8* out_ptr);

  File::IOFile m_file;
  u64 m_size;

  s64 m_file_area_shift;

  // Stored as big endian in memory, regardless of the host endianness
  TGCHeader m_header = {};
};

}  // namespace DiscIO