// Copyright 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "DiscIO/VolumeFileBlobReader.h"

#include "DiscIO/Filesystem.h"
#include "DiscIO/Volume.h"

namespace DiscIO
{
std::unique_ptr<VolumeFileBlobReader> VolumeFileBlobReader::Create(const Volume& volume,
                                                                   const FileSystem& file_system,
                                                                   const std::string& file_path)
{
  if (!file_system.IsValid())
    return nullptr;

  std::unique_ptr<FileInfo> file_info = file_system.FindFileInfo(file_path);
  if (!file_info || file_info->IsDirectory())
    return nullptr;

  return std::unique_ptr<VolumeFileBlobReader>{
      new VolumeFileBlobReader(volume, file_system, std::move(file_info))};
}

VolumeFileBlobReader::VolumeFileBlobReader(const Volume& volume, const FileSystem& file_system,
                                           std::unique_ptr<FileInfo> file_info)
    : m_volume(volume), m_file_system(file_system), m_file_info(std::move(file_info))
{
}

u64 VolumeFileBlobReader::GetDataSize() const
{
  return m_file_info->GetSize();
}

u64 VolumeFileBlobReader::GetRawSize() const
{
  return GetDataSize();
}

bool VolumeFileBlobReader::Read(u64 offset, u64 length, u8* out_ptr)
{
  if (offset + length > m_file_info->GetSize())
    return false;

  return m_volume.Read(m_file_info->GetOffset() + offset, length, out_ptr,
                       m_file_system.GetPartition());
}
}  // namespace