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int SDLNet_ResizePacket(UDPpacket *packet, int size)
Resize a UDPpackets data buffer to size bytes. The old data buffer will not be retained, so the new buffer is invalid after this call.
Returns: the new size of the data in the packet. If the number returned is less than what you asked for, that's an error.
3.5.1 SDLNet_AllocPacket, 3.5.4 SDLNet_AllocPacketV, 3.5.3 SDLNet_FreePacket, 4.4 UDPpacket