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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file packet.h Basic functions to create, fill and read packets.
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*/
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#ifndef NETWORK_CORE_PACKET_H
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#define NETWORK_CORE_PACKET_H
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#include "config.h"
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#include "core.h"
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#include "../../string_type.h"
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typedef uint16 PacketSize; ///< Size of the whole packet.
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typedef uint8 PacketType; ///< Identifier for the packet
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/**
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* Internal entity of a packet. As everything is sent as a packet,
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* all network communication will need to call the functions that
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* populate the packet.
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* Every packet can be at most SEND_MTU bytes. Overflowing this
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* limit will give an assertion when sending (i.e. writing) the
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* packet. Reading past the size of the packet when receiving
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* will return all 0 values and "" in case of the string.
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*
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* --- Points of attention ---
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* - all > 1 byte integral values are written in little endian,
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* unless specified otherwise.
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* Thus, 0x01234567 would be sent as {0x67, 0x45, 0x23, 0x01}.
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* - all sent strings are of variable length and terminated by a '\0'.
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* Thus, the length of the strings is not sent.
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* - years that are leap years in the 'days since X' to 'date' calculations:
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* (year % 4 == 0) and ((year % 100 != 0) or (year % 400 == 0))
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*/
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struct Packet {
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/** The next packet. Used for queueing packets before sending. */
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Packet *next;
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/**
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* The size of the whole packet for received packets. For packets
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* that will be sent, the value is filled in just before the
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* actual transmission.
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*/
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PacketSize size;
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/** The current read/write position in the packet */
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PacketSize pos;
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/** The buffer of this packet, of basically variable length up to SEND_MTU. */
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byte *buffer;
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private:
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/** Socket we're associated with. */
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NetworkSocketHandler *cs;
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public:
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Packet(NetworkSocketHandler *cs);
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Packet(PacketType type);
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~Packet();
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/* Sending/writing of packets */
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void PrepareToSend();
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void Send_bool (bool data);
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void Send_uint8 (uint8 data);
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void Send_uint16(uint16 data);
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void Send_uint32(uint32 data);
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void Send_uint64(uint64 data);
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void Send_string(const char *data);
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/* Reading/receiving of packets */
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void ReadRawPacketSize();
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void PrepareToRead();
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bool CanReadFromPacket (uint bytes_to_read);
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bool Recv_bool ();
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uint8 Recv_uint8 ();
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uint16 Recv_uint16();
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uint32 Recv_uint32();
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uint64 Recv_uint64();
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void Recv_string(char *buffer, size_t size, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK);
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};
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#endif /* NETWORK_CORE_PACKET_H */
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