ref: 3cad4c9a1187b6b87fee94db840005c3c4bbe4a7
dir: /src/net_structrw.c/
//
// Copyright(C) 2005-2014 Simon Howard
//
// This program 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; either version 2
// of the License, or (at your option) any later version.
//
// This program 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. See the
// GNU General Public License for more details.
//
// Reading and writing various structures into packets
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "doomtype.h"
#include "i_system.h"
#include "m_misc.h"
#include "net_packet.h"
#include "net_structrw.h"
// String names for the enum values in net_protocol_t, which are what is
// sent over the wire. Every enum value must have an entry in this list.
static struct
{
net_protocol_t protocol;
const char *name;
} protocol_names[] = {
{NET_PROTOCOL_CHOCOLATE_DOOM_0, "CHOCOLATE_DOOM_0"},
};
void NET_WriteConnectData(net_packet_t *packet, net_connect_data_t *data)
{
NET_WriteInt8(packet, data->gamemode);
NET_WriteInt8(packet, data->gamemission);
NET_WriteInt8(packet, data->lowres_turn);
NET_WriteInt8(packet, data->drone);
NET_WriteInt8(packet, data->max_players);
NET_WriteInt8(packet, data->is_freedoom);
NET_WriteSHA1Sum(packet, data->wad_sha1sum);
NET_WriteSHA1Sum(packet, data->deh_sha1sum);
NET_WriteInt8(packet, data->player_class);
}
boolean NET_ReadConnectData(net_packet_t *packet, net_connect_data_t *data)
{
return NET_ReadInt8(packet, (unsigned int *) &data->gamemode)
&& NET_ReadInt8(packet, (unsigned int *) &data->gamemission)
&& NET_ReadInt8(packet, (unsigned int *) &data->lowres_turn)
&& NET_ReadInt8(packet, (unsigned int *) &data->drone)
&& NET_ReadInt8(packet, (unsigned int *) &data->max_players)
&& NET_ReadInt8(packet, (unsigned int *) &data->is_freedoom)
&& NET_ReadSHA1Sum(packet, data->wad_sha1sum)
&& NET_ReadSHA1Sum(packet, data->deh_sha1sum)
&& NET_ReadInt8(packet, (unsigned int *) &data->player_class);
}
void NET_WriteSettings(net_packet_t *packet, net_gamesettings_t *settings)
{
int i;
NET_WriteInt8(packet, settings->ticdup);
NET_WriteInt8(packet, settings->extratics);
NET_WriteInt8(packet, settings->deathmatch);
NET_WriteInt8(packet, settings->nomonsters);
NET_WriteInt8(packet, settings->fast_monsters);
NET_WriteInt8(packet, settings->respawn_monsters);
NET_WriteInt8(packet, settings->episode);
NET_WriteInt8(packet, settings->map);
NET_WriteInt8(packet, settings->skill);
NET_WriteInt8(packet, settings->gameversion);
NET_WriteInt8(packet, settings->lowres_turn);
NET_WriteInt8(packet, settings->new_sync);
NET_WriteInt32(packet, settings->timelimit);
NET_WriteInt8(packet, settings->loadgame);
NET_WriteInt8(packet, settings->random);
NET_WriteInt8(packet, settings->num_players);
NET_WriteInt8(packet, settings->consoleplayer);
for (i = 0; i < settings->num_players; ++i)
{
NET_WriteInt8(packet, settings->player_classes[i]);
}
}
boolean NET_ReadSettings(net_packet_t *packet, net_gamesettings_t *settings)
{
boolean success;
int i;
success = NET_ReadInt8(packet, (unsigned int *) &settings->ticdup)
&& NET_ReadInt8(packet, (unsigned int *) &settings->extratics)
&& NET_ReadInt8(packet, (unsigned int *) &settings->deathmatch)
&& NET_ReadInt8(packet, (unsigned int *) &settings->nomonsters)
&& NET_ReadInt8(packet, (unsigned int *) &settings->fast_monsters)
&& NET_ReadInt8(packet, (unsigned int *) &settings->respawn_monsters)
&& NET_ReadInt8(packet, (unsigned int *) &settings->episode)
&& NET_ReadInt8(packet, (unsigned int *) &settings->map)
&& NET_ReadSInt8(packet, &settings->skill)
&& NET_ReadInt8(packet, (unsigned int *) &settings->gameversion)
&& NET_ReadInt8(packet, (unsigned int *) &settings->lowres_turn)
&& NET_ReadInt8(packet, (unsigned int *) &settings->new_sync)
&& NET_ReadInt32(packet, (unsigned int *) &settings->timelimit)
&& NET_ReadSInt8(packet, (signed int *) &settings->loadgame)
&& NET_ReadInt8(packet, (unsigned int *) &settings->random)
&& NET_ReadInt8(packet, (unsigned int *) &settings->num_players)
&& NET_ReadSInt8(packet, (signed int *) &settings->consoleplayer);
if (!success)
{
return false;
}
for (i = 0; i < settings->num_players && i < NET_MAXPLAYERS; ++i)
{
if (!NET_ReadInt8(packet,
(unsigned int *) &settings->player_classes[i]))
{
return false;
}
}
return true;
}
boolean NET_ReadQueryData(net_packet_t *packet, net_querydata_t *query)
{
boolean success;
query->version = NET_ReadSafeString(packet);
success = query->version != NULL
&& NET_ReadInt8(packet, (unsigned int *) &query->server_state)
&& NET_ReadInt8(packet, (unsigned int *) &query->num_players)
&& NET_ReadInt8(packet, (unsigned int *) &query->max_players)
&& NET_ReadInt8(packet, (unsigned int *) &query->gamemode)
&& NET_ReadInt8(packet, (unsigned int *) &query->gamemission);
if (!success)
{
return false;
}
query->description = NET_ReadSafeString(packet);
// We read the list of protocols supported by the server. However,
// old versions of Chocolate Doom do not support this field; it is
// okay if it cannot be successfully read.
query->protocol = NET_ReadProtocolList(packet);
return query->description != NULL;
}
void NET_WriteQueryData(net_packet_t *packet, net_querydata_t *query)
{
NET_WriteString(packet, query->version);
NET_WriteInt8(packet, query->server_state);
NET_WriteInt8(packet, query->num_players);
NET_WriteInt8(packet, query->max_players);
NET_WriteInt8(packet, query->gamemode);
NET_WriteInt8(packet, query->gamemission);
NET_WriteString(packet, query->description);
// Write a list of all supported protocols. Note that the query->protocol
// field is ignored here; it is only used when receiving.
NET_WriteProtocolList(packet);
}
void NET_WriteTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff,
boolean lowres_turn)
{
// Header
NET_WriteInt8(packet, diff->diff);
// Write the fields which are enabled:
if (diff->diff & NET_TICDIFF_FORWARD)
NET_WriteInt8(packet, diff->cmd.forwardmove);
if (diff->diff & NET_TICDIFF_SIDE)
NET_WriteInt8(packet, diff->cmd.sidemove);
if (diff->diff & NET_TICDIFF_TURN)
{
if (lowres_turn)
{
NET_WriteInt8(packet, diff->cmd.angleturn / 256);
}
else
{
NET_WriteInt16(packet, diff->cmd.angleturn);
}
}
if (diff->diff & NET_TICDIFF_BUTTONS)
NET_WriteInt8(packet, diff->cmd.buttons);
if (diff->diff & NET_TICDIFF_CONSISTANCY)
NET_WriteInt8(packet, diff->cmd.consistancy);
if (diff->diff & NET_TICDIFF_CHATCHAR)
NET_WriteInt8(packet, diff->cmd.chatchar);
if (diff->diff & NET_TICDIFF_RAVEN)
{
NET_WriteInt8(packet, diff->cmd.lookfly);
NET_WriteInt8(packet, diff->cmd.arti);
}
if (diff->diff & NET_TICDIFF_STRIFE)
{
NET_WriteInt8(packet, diff->cmd.buttons2);
NET_WriteInt16(packet, diff->cmd.inventory);
}
}
boolean NET_ReadTiccmdDiff(net_packet_t *packet, net_ticdiff_t *diff,
boolean lowres_turn)
{
unsigned int val;
signed int sval;
// Read header
if (!NET_ReadInt8(packet, &diff->diff))
return false;
// Read fields
if (diff->diff & NET_TICDIFF_FORWARD)
{
if (!NET_ReadSInt8(packet, &sval))
return false;
diff->cmd.forwardmove = sval;
}
if (diff->diff & NET_TICDIFF_SIDE)
{
if (!NET_ReadSInt8(packet, &sval))
return false;
diff->cmd.sidemove = sval;
}
if (diff->diff & NET_TICDIFF_TURN)
{
if (lowres_turn)
{
if (!NET_ReadSInt8(packet, &sval))
return false;
diff->cmd.angleturn = sval * 256;
}
else
{
if (!NET_ReadSInt16(packet, &sval))
return false;
diff->cmd.angleturn = sval;
}
}
if (diff->diff & NET_TICDIFF_BUTTONS)
{
if (!NET_ReadInt8(packet, &val))
return false;
diff->cmd.buttons = val;
}
if (diff->diff & NET_TICDIFF_CONSISTANCY)
{
if (!NET_ReadInt8(packet, &val))
return false;
diff->cmd.consistancy = val;
}
if (diff->diff & NET_TICDIFF_CHATCHAR)
{
if (!NET_ReadInt8(packet, &val))
return false;
diff->cmd.chatchar = val;
}
if (diff->diff & NET_TICDIFF_RAVEN)
{
if (!NET_ReadInt8(packet, &val))
return false;
diff->cmd.lookfly = val;
if (!NET_ReadInt8(packet, &val))
return false;
diff->cmd.arti = val;
}
if (diff->diff & NET_TICDIFF_STRIFE)
{
if (!NET_ReadInt8(packet, &val))
return false;
diff->cmd.buttons2 = val;
if (!NET_ReadInt16(packet, &val))
return false;
diff->cmd.inventory = val;
}
return true;
}
void NET_TiccmdDiff(ticcmd_t *tic1, ticcmd_t *tic2, net_ticdiff_t *diff)
{
diff->diff = 0;
diff->cmd = *tic2;
if (tic1->forwardmove != tic2->forwardmove)
diff->diff |= NET_TICDIFF_FORWARD;
if (tic1->sidemove != tic2->sidemove)
diff->diff |= NET_TICDIFF_SIDE;
if (tic1->angleturn != tic2->angleturn)
diff->diff |= NET_TICDIFF_TURN;
if (tic1->buttons != tic2->buttons)
diff->diff |= NET_TICDIFF_BUTTONS;
if (tic1->consistancy != tic2->consistancy)
diff->diff |= NET_TICDIFF_CONSISTANCY;
if (tic2->chatchar != 0)
diff->diff |= NET_TICDIFF_CHATCHAR;
// Heretic/Hexen-specific
if (tic1->lookfly != tic2->lookfly || tic2->arti != 0)
diff->diff |= NET_TICDIFF_RAVEN;
// Strife-specific
if (tic1->buttons2 != tic2->buttons2 || tic2->inventory != 0)
diff->diff |= NET_TICDIFF_STRIFE;
}
void NET_TiccmdPatch(ticcmd_t *src, net_ticdiff_t *diff, ticcmd_t *dest)
{
memmove(dest, src, sizeof(ticcmd_t));
// Apply the diff
if (diff->diff & NET_TICDIFF_FORWARD)
dest->forwardmove = diff->cmd.forwardmove;
if (diff->diff & NET_TICDIFF_SIDE)
dest->sidemove = diff->cmd.sidemove;
if (diff->diff & NET_TICDIFF_TURN)
dest->angleturn = diff->cmd.angleturn;
if (diff->diff & NET_TICDIFF_BUTTONS)
dest->buttons = diff->cmd.buttons;
if (diff->diff & NET_TICDIFF_CONSISTANCY)
dest->consistancy = diff->cmd.consistancy;
if (diff->diff & NET_TICDIFF_CHATCHAR)
dest->chatchar = diff->cmd.chatchar;
else
dest->chatchar = 0;
// Heretic/Hexen specific:
if (diff->diff & NET_TICDIFF_RAVEN)
{
dest->lookfly = diff->cmd.lookfly;
dest->arti = diff->cmd.arti;
}
else
{
dest->arti = 0;
}
// Strife-specific:
if (diff->diff & NET_TICDIFF_STRIFE)
{
dest->buttons2 = diff->cmd.buttons2;
dest->inventory = diff->cmd.inventory;
}
else
{
dest->inventory = 0;
}
}
//
// net_full_ticcmd_t
//
boolean NET_ReadFullTiccmd(net_packet_t *packet, net_full_ticcmd_t *cmd, boolean lowres_turn)
{
unsigned int bitfield;
int i;
// Latency
if (!NET_ReadSInt16(packet, &cmd->latency))
{
return false;
}
// Regenerate playeringame from the "header" bitfield
if (!NET_ReadInt8(packet, &bitfield))
{
return false;
}
for (i=0; i<NET_MAXPLAYERS; ++i)
{
cmd->playeringame[i] = (bitfield & (1 << i)) != 0;
}
// Read cmds
for (i=0; i<NET_MAXPLAYERS; ++i)
{
if (cmd->playeringame[i])
{
if (!NET_ReadTiccmdDiff(packet, &cmd->cmds[i], lowres_turn))
{
return false;
}
}
}
return true;
}
void NET_WriteFullTiccmd(net_packet_t *packet, net_full_ticcmd_t *cmd, boolean lowres_turn)
{
unsigned int bitfield;
int i;
// Write the latency
NET_WriteInt16(packet, cmd->latency);
// Write "header" byte indicating which players are active
// in this ticcmd
bitfield = 0;
for (i=0; i<NET_MAXPLAYERS; ++i)
{
if (cmd->playeringame[i])
{
bitfield |= 1 << i;
}
}
NET_WriteInt8(packet, bitfield);
// Write player ticcmds
for (i=0; i<NET_MAXPLAYERS; ++i)
{
if (cmd->playeringame[i])
{
NET_WriteTiccmdDiff(packet, &cmd->cmds[i], lowres_turn);
}
}
}
void NET_WriteWaitData(net_packet_t *packet, net_waitdata_t *data)
{
int i;
NET_WriteInt8(packet, data->num_players);
NET_WriteInt8(packet, data->num_drones);
NET_WriteInt8(packet, data->ready_players);
NET_WriteInt8(packet, data->max_players);
NET_WriteInt8(packet, data->is_controller);
NET_WriteInt8(packet, data->consoleplayer);
for (i = 0; i < data->num_players && i < NET_MAXPLAYERS; ++i)
{
NET_WriteString(packet, data->player_names[i]);
NET_WriteString(packet, data->player_addrs[i]);
}
NET_WriteSHA1Sum(packet, data->wad_sha1sum);
NET_WriteSHA1Sum(packet, data->deh_sha1sum);
NET_WriteInt8(packet, data->is_freedoom);
}
boolean NET_ReadWaitData(net_packet_t *packet, net_waitdata_t *data)
{
int i;
char *s;
if (!NET_ReadInt8(packet, (unsigned int *) &data->num_players)
|| !NET_ReadInt8(packet, (unsigned int *) &data->num_drones)
|| !NET_ReadInt8(packet, (unsigned int *) &data->ready_players)
|| !NET_ReadInt8(packet, (unsigned int *) &data->max_players)
|| !NET_ReadInt8(packet, (unsigned int *) &data->is_controller)
|| !NET_ReadSInt8(packet, &data->consoleplayer))
{
return false;
}
for (i = 0; i < data->num_players && i < NET_MAXPLAYERS; ++i)
{
s = NET_ReadString(packet);
if (s == NULL || strlen(s) >= MAXPLAYERNAME)
{
return false;
}
M_StringCopy(data->player_names[i], s, MAXPLAYERNAME);
s = NET_ReadString(packet);
if (s == NULL || strlen(s) >= MAXPLAYERNAME)
{
return false;
}
M_StringCopy(data->player_addrs[i], s, MAXPLAYERNAME);
}
return NET_ReadSHA1Sum(packet, data->wad_sha1sum)
&& NET_ReadSHA1Sum(packet, data->deh_sha1sum)
&& NET_ReadInt8(packet, (unsigned int *) &data->is_freedoom);
}
static boolean NET_ReadBlob(net_packet_t *packet, uint8_t *buf, size_t len)
{
unsigned int b;
int i;
for (i=0; i<len; ++i)
{
if (!NET_ReadInt8(packet, &b))
{
return false;
}
buf[i] = b;
}
return true;
}
static void NET_WriteBlob(net_packet_t *packet, uint8_t *buf, size_t len)
{
int i;
for (i=0; i<len; ++i)
{
NET_WriteInt8(packet, buf[i]);
}
}
boolean NET_ReadSHA1Sum(net_packet_t *packet, sha1_digest_t digest)
{
return NET_ReadBlob(packet, digest, sizeof(sha1_digest_t));
}
void NET_WriteSHA1Sum(net_packet_t *packet, sha1_digest_t digest)
{
NET_WriteBlob(packet, digest, sizeof(sha1_digest_t));
}
boolean NET_ReadPRNGSeed(net_packet_t *packet, prng_seed_t seed)
{
return NET_ReadBlob(packet, seed, sizeof(prng_seed_t));
}
void NET_WritePRNGSeed(net_packet_t *packet, prng_seed_t seed)
{
NET_WriteBlob(packet, seed, sizeof(prng_seed_t));
}
static net_protocol_t ParseProtocolName(const char *name)
{
int i;
for (i = 0; i < arrlen(protocol_names); ++i)
{
if (!strcmp(protocol_names[i].name, name))
{
return protocol_names[i].protocol;
}
}
return NET_PROTOCOL_UNKNOWN;
}
// NET_ReadProtocol reads a single string-format protocol name from the given
// packet, returning NET_PROTOCOL_UNKNOWN if the string describes an unknown
// protocol.
net_protocol_t NET_ReadProtocol(net_packet_t *packet)
{
const char *name;
name = NET_ReadString(packet);
if (name == NULL)
{
return NET_PROTOCOL_UNKNOWN;
}
return ParseProtocolName(name);
}
// NET_WriteProtocol writes a single string-format protocol name to a packet.
void NET_WriteProtocol(net_packet_t *packet, net_protocol_t protocol)
{
int i;
for (i = 0; i < arrlen(protocol_names); ++i)
{
if (protocol_names[i].protocol == protocol)
{
NET_WriteString(packet, protocol_names[i].name);
return;
}
}
// If you add an entry to the net_protocol_t enum, a corresponding entry
// must be added to the protocol_names list.
I_Error("NET_WriteProtocol: protocol %d missing from protocol_names "
"list; please add it.", protocol);
}
// NET_ReadProtocolList reads a list of string-format protocol names from
// the given packet, returning a single protocol number. The protocol that is
// returned is the last protocol in the list that is a supported protocol. If
// no recognized protocols are read, NET_PROTOCOL_UNKNOWN is returned.
net_protocol_t NET_ReadProtocolList(net_packet_t *packet)
{
net_protocol_t result;
unsigned int num_protocols;
int i;
if (!NET_ReadInt8(packet, &num_protocols))
{
return NET_PROTOCOL_UNKNOWN;
}
result = NET_PROTOCOL_UNKNOWN;
for (i = 0; i < num_protocols; ++i)
{
net_protocol_t p;
const char *name;
name = NET_ReadString(packet);
if (name == NULL)
{
return NET_PROTOCOL_UNKNOWN;
}
p = ParseProtocolName(name);
if (p != NET_PROTOCOL_UNKNOWN)
{
result = p;
}
}
return result;
}
// NET_WriteProtocolList writes a list of string-format protocol names into
// the given packet, all the supported protocols in the net_protocol_t enum.
// This is slightly different to other functions in this file, in that there
// is nothing the caller can "choose" to write; the built-in list of all
// protocols is always sent.
void NET_WriteProtocolList(net_packet_t *packet)
{
int i;
NET_WriteInt8(packet, NET_NUM_PROTOCOLS);
for (i = 0; i < NET_NUM_PROTOCOLS; ++i)
{
NET_WriteProtocol(packet, i);
}
}