Basic CD image loading

src/common/cd_image.h

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+#pragma once
+#include "types.h"
+
+class ByteStream;
+
+class CDImage
+{
+public:
+  CDImage();
+  ~CDImage();
+
+  enum class ReadMode : u32
+  {
+    DataOnly,     // 2048 bytes per sector.
+    RawSector,    // 2352 bytes per sector.
+    RawNoSync,    // 2340 bytes per sector.
+  };
+
+  // Conversion helpers.
+  static constexpr u64 MSFToLBA(u32 minute, u32 second, u32 frame);
+  static constexpr void LBAToMSF(u64 lba, u32* minute, u32* second, u32* frame);
+
+  // Accessors.
+  u64 GetCurrentLBA() const { return m_current_lba; }
+  u64 GetLBACount() const { return m_lba_count; }
+
+  bool Open(const char* path);
+
+  // Seek to data LBA.
+  bool Seek(u64 lba);
+
+  // Seek to audio timestamp (MSF).
+  bool Seek(u32 minute, u32 second, u32 frame);
+
+  // Seek and read at the same time.
+  u32 Read(ReadMode read_mode, u64 lba, u32 sector_count, void* buffer);
+  u32 Read(ReadMode read_mode, u32 minute, u32 second, u32 frame, u32 sector_count, void* buffer);
+
+  // Read from the current LBA. Returns the number of sectors read.
+  u32 Read(ReadMode read_mode, u32 sector_count, void* buffer);
+
+private:
+  enum : u32
+  {
+    RAW_SECTOR_SIZE = 2352,
+    DATA_SECTOR_SIZE = 2048,
+    SECTOR_SYNC_SIZE = 12,
+    FRAMES_PER_SECOND = 75, // "sectors"
+    SECONDS_PER_MINUTE = 60,
+    FRAMES_PER_MINUTE = FRAMES_PER_SECOND * SECONDS_PER_MINUTE,
+  };
+
+  // TODO: Multiple data files from cue sheet
+  ByteStream* m_data_file = nullptr;
+
+  // Current LBA/total LBAs.
+  u64 m_current_lba = 0;
+  u64 m_lba_count = 0;
+};