#include "Util.h"

namespace lwe
{
	bool Util::IsEqual(const void* const a, const void* const b, const UInt_64 size)
	{
		Byte* aBytes = (Byte*)a;
		Byte* bBytes = (Byte*)b;
		UInt_64 remainder = size;
		UInt_64 i = 0;

		while (i < size)
		{
			if (remainder >= sizeof(UInt_64))
			{
				if (*(UInt_64*)&aBytes[i] != *(UInt_64*)&bBytes[i])
					return false;

				i += sizeof(UInt_64);
			}
			else if (remainder >= sizeof(UInt_32))
			{
				if (*(UInt_32*)&aBytes[i] != *(UInt_32*)&bBytes[i])
					return false;

				i += sizeof(UInt_32);
			}
			else if (remainder >= sizeof(UInt_16))
			{
				if (*(UInt_16*)&aBytes[i] != *(UInt_16*)&bBytes[i])
					return false;

				i += sizeof(UInt_16);
			}
			else
			{
				if (aBytes[i] != bBytes[i])
					return false;

				i += sizeof(Byte);
			}

			remainder = size - i;
		}

		return true;
	}

	void Util::Copy(void* const out, const void* const in, const UInt_64 size)
	{
		Byte* outB = (Byte*)out;
		Byte* inB = (Byte*)in;
		UInt_64 remainder = size;

		UInt_64 i = 0;
		while (i < size)
		{
			if (remainder >= sizeof(UInt_64))
			{
				*(UInt_64*)&outB[i] = *(UInt_64*)&inB[i];
				i += sizeof(UInt_64);
			}
			else if (remainder >= sizeof(UInt_32))
			{
				*(UInt_32*)&outB[i] = *(UInt_32*)&inB[i];
				i += sizeof(UInt_32);
			}
			else if (remainder >= sizeof(UInt_16))
			{
				*(UInt_16*)&outB[i] = *(UInt_16*)&inB[i];
				i += sizeof(UInt_16);
			}
			else
			{
				outB[i++] = inB[i];
			}

			remainder = size - i;
		}
	}

	void Util::Zero(void* const in, const UInt_64 size)
	{
		Byte* inB = (Byte*)in;
		UInt_64 remainder = size;
		UInt_64 i = 0;
		while (i < size)
		{
			if (remainder >= sizeof(UInt_64))
			{
				*(UInt_64*)&inB[i] = 0;
				i += sizeof(UInt_64);
			}
			else if (remainder >= sizeof(UInt_32))
			{
				*(UInt_32*)&inB[i] = 0;
				i += sizeof(UInt_32);
			}
			else if (remainder >= sizeof(UInt_16))
			{
				*(UInt_16*)&inB[i] = 0;
				i += sizeof(UInt_16);
			}
			else
			{
				inB[i++] = 0;
			}

			remainder = size - i;
		}
	}
}