Common: Refactor CDImage class to support multiple tracks/indices

src/common/cd_image_bin.cpp

@@ -0,0 +1,77 @@
+#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_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;
+}