EW_state.h

#ifndef NEWSTATE_H
#define NEWSTATE_H

#include <cstring>
#include <cstddef>

namespace EW
{

	class NewState
	{
	public:
		virtual void Save(const void *ptr, size_t size, const char *name) = 0;
		virtual void Load(void *ptr, size_t size, const char *name) = 0;
		virtual void EnterSection(const char *name, ...) { }
		virtual void ExitSection(const char *name, ...) { }
	};

	class NewStateDummy : public NewState
	{
	private:
		long length;
	public:
		NewStateDummy();
		long GetLength() { return length; }
		void Rewind() { length = 0; }
		virtual void Save(const void *ptr, size_t size, const char *name);
		virtual void Load(void *ptr, size_t size, const char *name);
	};

	class NewStateExternalBuffer : public NewState
	{
	private:
		char *const buffer;
		long length;
		const long maxlength;
	public:
		NewStateExternalBuffer(char *buffer, long maxlength);
		long GetLength() { return length; }
		void Rewind() { length = 0; }
		bool Overflow() { return length > maxlength; }
		virtual void Save(const void *ptr, size_t size, const char *name);
		virtual void Load(void *ptr, size_t size, const char *name);
	};

	struct FPtrs
	{
		void (*Save_)(const void *ptr, size_t size, const char *name);
		void (*Load_)(void *ptr, size_t size, const char *name);
		void (*EnterSection_)(const char *name);
		void (*ExitSection_)(const char *name);
	};

	class NewStateExternalFunctions : public NewState
	{
	private:
		void (*Save_)(const void *ptr, size_t size, const char *name);
		void (*Load_)(void *ptr, size_t size, const char *name);
		void (*EnterSection_)(const char *name);
		void (*ExitSection_)(const char *name);
	public:
		NewStateExternalFunctions(const FPtrs *ff);
		virtual void Save(const void *ptr, size_t size, const char *name);
		virtual void Load(void *ptr, size_t size, const char *name);
		virtual void EnterSection(const char *name, ...);
		virtual void ExitSection(const char *name, ...);
	};

	// defines and explicitly instantiates 
	#define SYNCFUNC(x)\
		template void x::SyncState<false>(EW::NewState *ns);\
		template void x::SyncState<true>(EW::NewState *ns);\
		template<bool isReader>void x::SyncState(EW::NewState *ns)

	// N = normal variable
	// P = pointer to fixed size data
	// S = "sub object"
	// T = "ptr to sub object"
	// R = pointer, store its offset from some other pointer
	// E = general purpose cased value "enum"


	// first line is default value in converted enum; last line is default value in argument x
	#define EBS(x,d) do { int _ttmp = (d); if (isReader) ns->Load(&_ttmp, sizeof(_ttmp), #x); if (0)
	#define EVS(x,v,n) else if (!isReader && (x) == (v)) _ttmp = (n); else if (isReader && _ttmp == (n)) (x) = (v)
	#define EES(x,d) else if (isReader) (x) = (d); if (!isReader) ns->Save(&_ttmp, sizeof(_ttmp), #x); } while (0)

	#define RSS(x,b) do { if (isReader)\
	{ ptrdiff_t _ttmp; ns->Load(&_ttmp, sizeof(_ttmp), #x); (x) = (_ttmp == (ptrdiff_t)0xdeadbeef ? 0 : (b) + _ttmp); }\
		else\
	{ ptrdiff_t _ttmp = (x) == 0 ? 0xdeadbeef : (x) - (b); ns->Save(&_ttmp, sizeof(_ttmp), #x); } } while (0)

	#define PSS(x,s) do { if (isReader) ns->Load((x), (s), #x); else ns->Save((x), (s), #x); } while (0)

	#define NSS(x) do { if (isReader) ns->Load(&(x), sizeof(x), #x); else ns->Save(&(x), sizeof(x), #x); } while (0)

	#define SSS(x) do { ns->EnterSection(#x); (x).SyncState<isReader>(ns); ns->ExitSection(#x); } while (0)

	#define TSS(x) do { ns->EnterSection(#x); (x)->SyncState<isReader>(ns); ns->ExitSection(#x); } while (0)

	}



#endif  //NEWSTATE_H