Method ReadSize

Plugins/UnLua/Source/UnLua/Private/BaseLib/LuaLib_File.cpp:130–159

/////FUNCTIONS FOR LUA LIB////////////////////// * @param Size is Size is Zero Means Read All From Current Offset,else means read SizeBytes from current Offset */

	 @param Size is Size is Zero Means Read All From Current Offset,else means read SizeBytes from current Offset
	 */
	FORCEINLINE  int ReadSize(TArray<uint8>& Buffer, uint32 Size = 0)
	{
		TArray<uint8> DataBuffer;
		static const int64 DataBufferSize = 10 * 1024;
		//when file is valid and is read mode or FILEWRITE_AllowRead flag is set
		if (this->IsReadable())
		{
			DataBuffer.AddUninitialized(DataBufferSize);//10K
			//get file size
			int64 FileSize = FILE->TotalSize();
			//get current offset
			int64 CurPos = FILE->Tell();
			//compute readable target size(size left to be read from current offset)
			int64 TargetSize = FileSize - CurPos;
			int64 ReadSize = 0;
			if (0 < Size)
			{
				TargetSize = FMath::Min(TargetSize, (int64)Size);
			}
			while (TargetSize)
			{
				CurPos = FILE->Tell();
				FILE->Serialize(DataBuffer.GetData(), FMath::Min(TargetSize, DataBufferSize));
				ReadSize = FILE->Tell() - CurPos;
				TargetSize -= ReadSize;
				Buffer.Append(DataBuffer.GetData(), ReadSize);
			}
		}
		return Buffer.Num();
	}

	//ReadLine
	FORCEINLINE void ReadLine(lua_State *L, bool bWithNewLineCh = false)