Play-/Source/discimages/CsoImageStream.h

#pragma once

#include <memory>
#include "Types.h"
#include "Stream.h"

class CCsoImageStream : public Framework::CStream
{
public:
	CCsoImageStream(std::unique_ptr<Framework::CStream> baseStream);
	virtual ~CCsoImageStream();

	virtual void Seek(int64 pos, Framework::STREAM_SEEK_DIRECTION whence) override;
	virtual uint64 Tell() override;
	virtual bool IsEOF() override;
	virtual uint64 Read(void* dest, uint64 bytes) override;
	virtual uint64 Write(const void* src, uint64 bytes) override;

private:
	void ReadFileHeader();
	void InitializeBuffers();
	uint64 GetTotalSize() const;
	uint32 ReadFromNextFrame(uint8* dest, uint64 maxBytes);
	uint64 ReadBaseAt(uint64 pos, uint8* dest, uint64 bytes);
	void DecompressFrame(uint32 frame, uint64 readBufferSize);

	std::unique_ptr<Framework::CStream> m_baseStream;
	uint32 m_frameSize;
	uint8 m_frameShift;
	uint8 m_indexShift;
	uint8* m_readBuffer;
	uint8* m_zlibBuffer;
	uint32 m_zlibBufferFrame;
	uint32* m_index;
	uint64 m_totalSize;
	uint64 m_position;
};