#pragma once

#include "common/IDataStream.h"
#include <vector>

/**
 *	An stream composed of many non-contiguous segments of a larger stream
 */
class ISegmentStream : public IDataStream
{
	public:
		ISegmentStream();
		~ISegmentStream();

		void	AttachStream(IDataStream * inStream);
		
		void	AddSegment(UInt64 offset, UInt64 length, UInt64 parentOffset);

		virtual void	ReadBuf(void * buf, UInt32 inLength);
		virtual void	WriteBuf(const void * buf, UInt32 inLength);
		virtual void	SetOffset(SInt64 inOffset);

	protected:
		IDataStream	* parent;

		struct SegmentInfo
		{
			SegmentInfo(UInt64 inOffset, UInt64 inLength, UInt64 inParentOffset)
			{
				offset = inOffset;
				length = inLength;
				parentOffset = inParentOffset;
			}

			UInt64	offset;
			UInt64	length;
			UInt64	parentOffset;
		};

		typedef std::vector <SegmentInfo>	SegmentInfoListType;
		SegmentInfoListType					segmentInfo;

		SegmentInfo *	LookupInfo(UInt64 offset);
};