Unsafe code in Network messages

Unsafe code in Network messages

```cpp
UnsignedInt dataLength = 0;
memcpy(&dataLength, data + i, sizeof(dataLength)); // safe, but...
i += sizeof(dataLength);

UnsignedByte *buf = NEW UnsignedByte[dataLength]; // CRASH, if sender gives us a dataLength of 2 GB.
memcpy(buf, data + i, dataLength);
i += dataLength;
```