Duckstation/src/common/cd_image_bin.cpp

#include "YBaseLib/Log.h"
#include "cd_image.h"
Log_SetChannel(CDImageBin);

class CDImageBin : public CDImage
{
public:
  CDImageBin();
  ~CDImageBin() override;

  bool Open(const char* filename);

private:
  std::FILE* m_fp = nullptr;
};

CDImageBin::CDImageBin() = default;

CDImageBin::~CDImageBin()
{
  if (m_fp)
    std::fclose(m_fp);
}

bool CDImageBin::Open(const char* filename)
{
  m_filename = filename;
  m_fp = std::fopen(filename, "rb");
  if (!m_fp)
  {
    Log_ErrorPrintf("Failed to open binfile '%s'", filename);
    return false;
  }

  const u32 track_sector_size = RAW_SECTOR_SIZE;

  // determine the length from the file
  std::fseek(m_fp, 0, SEEK_END);
  const u32 file_size = static_cast<u32>(std::ftell(m_fp));
  std::fseek(m_fp, 0, SEEK_SET);

  m_lba_count = file_size / track_sector_size;

  // Two seconds default pregap.
  const u32 pregap_frames = 2 * FRAMES_PER_SECOND;
  Index pregap_index = {};
  pregap_index.start_lba_on_disc = 0;
  pregap_index.start_lba_in_track = static_cast<LBA>(-static_cast<s32>(pregap_frames));
  pregap_index.length = pregap_frames;
  pregap_index.track_number = 1;
  pregap_index.is_pregap = true;
  m_indices.push_back(pregap_index);

  // Data index.
  Index data_index = {};
  data_index.file = m_fp;
  data_index.file_offset = 0;
  data_index.file_sector_size = track_sector_size;
  data_index.start_lba_on_disc = pregap_index.length;
  data_index.track_number = 1;
  data_index.start_lba_in_track = 0;
  data_index.length = m_lba_count;
  m_indices.push_back(data_index);

  // Assume a single track.
  m_tracks.push_back(Track{static_cast<u32>(1), data_index.start_lba_on_disc, static_cast<u32>(0), m_lba_count});

  return Seek(1, Position{0, 0, 0});
}

std::unique_ptr<CDImage> CDImage::OpenBinImage(const char* filename)
{
  std::unique_ptr<CDImageBin> image = std::make_unique<CDImageBin>();
  if (!image->Open(filename))
    return {};

  return image;
}