newtree/source/sv_nchan.c

/*
	sv_nchan.c

	user reliable data stream writes

	Copyright (C) 1996-1997  Id Software, Inc.

	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.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "server.h"
#include "crc.h"
#include "msg.h"
#include "world.h"
#include "commdef.h"
#include "cmd.h"
#include "sys.h"
#include "pmove.h"

// check to see if client block will fit, if not, rotate buffers
void ClientReliableCheckBlock(client_t *cl, int maxsize)
{
	if (cl->num_backbuf ||
		cl->netchan.message.cursize > 
		cl->netchan.message.maxsize - maxsize - 1) {
		// we would probably overflow the buffer, save it for next
		if (!cl->num_backbuf) {
			memset(&cl->backbuf, 0, sizeof(cl->backbuf));
			cl->backbuf.allowoverflow = true;
			cl->backbuf.data = cl->backbuf_data[0];
			cl->backbuf.maxsize = sizeof(cl->backbuf_data[0]);
			cl->backbuf_size[0] = 0;
			cl->num_backbuf++;
		}

		if (cl->backbuf.cursize > cl->backbuf.maxsize - maxsize - 1) {
			if (cl->num_backbuf == MAX_BACK_BUFFERS) {
				Con_Printf ("WARNING: MAX_BACK_BUFFERS for %s\n", cl->name);
				cl->backbuf.cursize = 0; // don't overflow without allowoverflow set
				cl->netchan.message.overflowed = true; // this will drop the client
				return;
			}
			memset(&cl->backbuf, 0, sizeof(cl->backbuf));
			cl->backbuf.allowoverflow = true;
			cl->backbuf.data = cl->backbuf_data[cl->num_backbuf];
			cl->backbuf.maxsize = sizeof(cl->backbuf_data[cl->num_backbuf]);
			cl->backbuf_size[cl->num_backbuf] = 0;
			cl->num_backbuf++;
		}
	}
}

// begin a client block, estimated maximum size
void ClientReliableWrite_Begin(client_t *cl, int c, int maxsize)
{
	ClientReliableCheckBlock(cl, maxsize);
	ClientReliableWrite_Byte(cl, c);
}

void ClientReliable_FinishWrite(client_t *cl)
{
	if (cl->num_backbuf) {
		cl->backbuf_size[cl->num_backbuf - 1] = cl->backbuf.cursize;

		if (cl->backbuf.overflowed) {
			Con_Printf ("WARNING: backbuf [%d] reliable overflow for %s\n",cl->num_backbuf,cl->name);
			cl->netchan.message.overflowed = true; // this will drop the client
		}
	}
}

void ClientReliableWrite_Angle(client_t *cl, float f)
{
	if (cl->num_backbuf) {
		MSG_WriteAngle(&cl->backbuf, f);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteAngle(&cl->netchan.message, f);
}

void ClientReliableWrite_Angle16(client_t *cl, float f)
{
	if (cl->num_backbuf) {
		MSG_WriteAngle16(&cl->backbuf, f);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteAngle16(&cl->netchan.message, f);
}

void ClientReliableWrite_Byte(client_t *cl, int c)
{
	if (cl->num_backbuf) {
		MSG_WriteByte(&cl->backbuf, c);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteByte(&cl->netchan.message, c);
}

void ClientReliableWrite_Char(client_t *cl, int c)
{
	if (cl->num_backbuf) {
		MSG_WriteChar(&cl->backbuf, c);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteChar(&cl->netchan.message, c);
}

void ClientReliableWrite_Float(client_t *cl, float f)
{
	if (cl->num_backbuf) {
		MSG_WriteFloat(&cl->backbuf, f);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteFloat(&cl->netchan.message, f);
}

void ClientReliableWrite_Coord(client_t *cl, float f)
{
	if (cl->num_backbuf) {
		MSG_WriteCoord(&cl->backbuf, f);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteCoord(&cl->netchan.message, f);
}

void ClientReliableWrite_Long(client_t *cl, int c)
{
	if (cl->num_backbuf) {
		MSG_WriteLong(&cl->backbuf, c);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteLong(&cl->netchan.message, c);
}

void ClientReliableWrite_Short(client_t *cl, int c)
{
	if (cl->num_backbuf) {
		MSG_WriteShort(&cl->backbuf, c);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteShort(&cl->netchan.message, c);
}

void ClientReliableWrite_String(client_t *cl, char *s)
{
	if (cl->num_backbuf) {
		MSG_WriteString(&cl->backbuf, s);
		ClientReliable_FinishWrite(cl);
	} else
		MSG_WriteString(&cl->netchan.message, s);
}

void ClientReliableWrite_SZ(client_t *cl, void *data, int len)
{
	if (cl->num_backbuf) {
		SZ_Write(&cl->backbuf, data, len);
		ClientReliable_FinishWrite(cl);
	} else
		SZ_Write(&cl->netchan.message, data, len);
}