public unsafe void UpdateInjection(byte *systemPtr)
        {
            var groupStructPtr = systemPtr + m_GroupFieldOffset;

            int length;
            ComponentChunkIterator iterator;

            m_EntityGroup.GetComponentChunkIterator(out length, out iterator);

            for (var i = 0; i != m_ComponentDataInjections.Length; i++)
            {
                ComponentDataArray <ProxyComponentData> data;
                m_EntityGroup.GetComponentDataArray(ref iterator, m_ComponentDataInjections[i].IndexInComponentGroup,
                                                    length, out data);
                UnsafeUtility.CopyStructureToPtr(ref data, groupStructPtr + m_ComponentDataInjections[i].FieldOffset);
            }

            for (var i = 0; i != m_SharedComponentInjections.Length; i++)
            {
                SharedComponentDataArray <ProxySharedComponentData> data;
                m_EntityGroup.GetSharedComponentDataArray(ref iterator,
                                                          m_SharedComponentInjections[i].IndexInComponentGroup, length, out data);
                UnsafeUtility.CopyStructureToPtr(ref data, groupStructPtr + m_SharedComponentInjections[i].FieldOffset);
            }

            for (var i = 0; i != m_BufferArrayInjections.Length; i++)
            {
                BufferArray <ProxyBufferElementData> data;
                m_EntityGroup.GetBufferArray(ref iterator, m_BufferArrayInjections[i].IndexInComponentGroup, length,
                                             out data);
                UnsafeUtility.CopyStructureToPtr(ref data, groupStructPtr + m_BufferArrayInjections[i].FieldOffset);
            }

            if (m_EntityArrayOffset != -1)
            {
                EntityArray entityArray;
                m_EntityGroup.GetEntityArray(ref iterator, length, out entityArray);
                UnsafeUtility.CopyStructureToPtr(ref entityArray, groupStructPtr + m_EntityArrayOffset);
            }

            if (m_InjectionContext.HasEntries)
            {
                m_InjectionContext.UpdateEntries(m_EntityGroup, ref iterator, length, groupStructPtr);
            }

            if (m_LengthOffset != -1)
            {
                UnsafeUtility.CopyStructureToPtr(ref length, groupStructPtr + m_LengthOffset);
            }
        }