sv_user.c

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/*
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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
*/
// sv_user.c -- server code for moving users
 
#include "quakedef.h"
#include "sv_demo.h"
#define DEBUGMOVES 0
 
static usercmd_t usercmd;
extern cvar_t sv_autodemo_perclient;
extern cvar_t sv_rollangle;
extern cvar_t sv_rollspeed;
 
/*
==================
SV_PreSpawn_f
==================
*/
void SV_PreSpawn_f(cmd_state_t *cmd)
{
    if (host_client->prespawned)
    {
        Con_Print("prespawn not valid -- already prespawned\n");
        return;
    }
    host_client->prespawned = true;
 
    if (host_client->netconnection)
    {
        SZ_Write (&host_client->netconnection->message, sv.signon.data, sv.signon.cursize);
        MSG_WriteByte (&host_client->netconnection->message, svc_signonnum);
        MSG_WriteByte (&host_client->netconnection->message, 2);
        host_client->sendsignon = 0;        // enable unlimited sends again
    }
 
    // reset the name change timer because the client will send name soon
    host_client->nametime = 0;
}
 
/*
==================
SV_Spawn_f
==================
*/
void SV_Spawn_f(cmd_state_t *cmd)
{
    prvm_prog_t *prog = SVVM_prog;
    int i;
    client_t *client;
    int stats[MAX_CL_STATS];
 
    if (!host_client->prespawned)
    {
        Con_Print("Spawn not valid -- not yet prespawned\n");
        return;
    }
    if (host_client->spawned)
    {
        Con_Print("Spawn not valid -- already spawned\n");
        return;
    }
    host_client->spawned = true;
 
    // reset name change timer again because they might want to change name
    // again in the first 5 seconds after connecting
    host_client->nametime = 0;
 
    // LadyHavoc: moved this above the QC calls at FrikaC's request
    // LadyHavoc: commented this out
    //if (host_client->netconnection)
    //  SZ_Clear (&host_client->netconnection->message);
 
    // run the entrance script
    if (sv.loadgame)
    {
        // loaded games are fully initialized already
        if (PRVM_serverfunction(RestoreGame))
        {
            Con_DPrint("Calling RestoreGame\n");
            PRVM_serverglobalfloat(time) = sv.time;
            PRVM_serverglobaledict(self) = PRVM_EDICT_TO_PROG(host_client->edict);
            prog->ExecuteProgram(prog, PRVM_serverfunction(RestoreGame), "QC function RestoreGame is missing");
        }
    }
    else
    {
        //Con_Printf("SV_Spawn_f: host_client->edict->netname = %s, host_client->edict->netname = %s, host_client->name = %s\n", PRVM_GetString(PRVM_serveredictstring(host_client->edict, netname)), PRVM_GetString(PRVM_serveredictstring(host_client->edict, netname)), host_client->name);
 
        // copy spawn parms out of the client_t
        for (i=0 ; i< NUM_SPAWN_PARMS ; i++)
            (&PRVM_serverglobalfloat(parm1))[i] = host_client->spawn_parms[i];
 
        // call the spawn function
        host_client->clientconnectcalled = true;
        PRVM_serverglobalfloat(time) = sv.time;
        PRVM_serverglobaledict(self) = PRVM_EDICT_TO_PROG(host_client->edict);
        prog->ExecuteProgram(prog, PRVM_serverfunction(ClientConnect), "QC function ClientConnect is missing");
 
        Con_Printf("%s connected\n", host_client->name);
 
        PRVM_serverglobalfloat(time) = sv.time;
        prog->ExecuteProgram(prog, PRVM_serverfunction(PutClientInServer), "QC function PutClientInServer is missing");
    }
 
    if (!host_client->netconnection)
        return;
 
    // send time of update
    MSG_WriteByte (&host_client->netconnection->message, svc_time);
    MSG_WriteFloat (&host_client->netconnection->message, sv.time);
 
    // send all current names, colors, and frag counts
    for (i = 0, client = svs.clients;i < svs.maxclients;i++, client++)
    {
        if (!client->active)
            continue;
        MSG_WriteByte (&host_client->netconnection->message, svc_updatename);
        MSG_WriteByte (&host_client->netconnection->message, i);
        MSG_WriteString (&host_client->netconnection->message, client->name);
        MSG_WriteByte (&host_client->netconnection->message, svc_updatefrags);
        MSG_WriteByte (&host_client->netconnection->message, i);
        MSG_WriteShort (&host_client->netconnection->message, client->frags);
        MSG_WriteByte (&host_client->netconnection->message, svc_updatecolors);
        MSG_WriteByte (&host_client->netconnection->message, i);
        MSG_WriteByte (&host_client->netconnection->message, client->colors);
    }
 
    // send all current light styles
    for (i=0 ; i<MAX_LIGHTSTYLES ; i++)
    {
        if (sv.lightstyles[i][0])
        {
            MSG_WriteByte (&host_client->netconnection->message, svc_lightstyle);
            MSG_WriteByte (&host_client->netconnection->message, (char)i);
            MSG_WriteString (&host_client->netconnection->message, sv.lightstyles[i]);
        }
    }
 
    // send some stats
    MSG_WriteByte (&host_client->netconnection->message, svc_updatestat);
    MSG_WriteByte (&host_client->netconnection->message, STAT_TOTALSECRETS);
    MSG_WriteLong (&host_client->netconnection->message, (int)PRVM_serverglobalfloat(total_secrets));
 
    MSG_WriteByte (&host_client->netconnection->message, svc_updatestat);
    MSG_WriteByte (&host_client->netconnection->message, STAT_TOTALMONSTERS);
    MSG_WriteLong (&host_client->netconnection->message, (int)PRVM_serverglobalfloat(total_monsters));
 
    MSG_WriteByte (&host_client->netconnection->message, svc_updatestat);
    MSG_WriteByte (&host_client->netconnection->message, STAT_SECRETS);
    MSG_WriteLong (&host_client->netconnection->message, (int)PRVM_serverglobalfloat(found_secrets));
 
    MSG_WriteByte (&host_client->netconnection->message, svc_updatestat);
    MSG_WriteByte (&host_client->netconnection->message, STAT_MONSTERS);
    MSG_WriteLong (&host_client->netconnection->message, (int)PRVM_serverglobalfloat(killed_monsters));
 
    // send a fixangle
    // Never send a roll angle, because savegames can catch the server
    // in a state where it is expecting the client to correct the angle
    // and it won't happen if the game was just loaded, so you wind up
    // with a permanent head tilt
    if (sv.loadgame)
    {
        MSG_WriteByte (&host_client->netconnection->message, svc_setangle);
        MSG_WriteAngle (&host_client->netconnection->message, PRVM_serveredictvector(host_client->edict, v_angle)[0], sv.protocol);
        MSG_WriteAngle (&host_client->netconnection->message, PRVM_serveredictvector(host_client->edict, v_angle)[1], sv.protocol);
        MSG_WriteAngle (&host_client->netconnection->message, 0, sv.protocol);
    }
    else
    {
        MSG_WriteByte (&host_client->netconnection->message, svc_setangle);
        MSG_WriteAngle (&host_client->netconnection->message, PRVM_serveredictvector(host_client->edict, angles)[0], sv.protocol);
        MSG_WriteAngle (&host_client->netconnection->message, PRVM_serveredictvector(host_client->edict, angles)[1], sv.protocol);
        MSG_WriteAngle (&host_client->netconnection->message, 0, sv.protocol);
    }
 
    SV_WriteClientdataToMessage (host_client, host_client->edict, &host_client->netconnection->message, stats);
 
    MSG_WriteByte (&host_client->netconnection->message, svc_signonnum);
    MSG_WriteByte (&host_client->netconnection->message, 3);
}
 
/*
==================
SV_Begin_f
==================
*/
void SV_Begin_f(cmd_state_t *cmd)
{
    if (!host_client->spawned)
    {
        Con_Print("Begin not valid -- not yet spawned\n");
        return;
    }
    if (host_client->begun)
    {
        Con_Print("Begin not valid -- already begun\n");
        return;
    }
    host_client->begun = true;
 
    // LadyHavoc: note: this code also exists in SV_DropClient
    if (sv.loadgame)
    {
        int i;
        for (i = 0;i < svs.maxclients;i++)
            if (svs.clients[i].active && !svs.clients[i].spawned)
                break;
        if (i == svs.maxclients)
        {
            Con_Printf("Loaded game, everyone rejoined - unpausing\n");
            sv.paused = sv.loadgame = false; // we're basically done with loading now
        }
    }
}
 
/*
===============
SV_SetIdealPitch
===============
*/
#define MAX_FORWARD 6
void SV_SetIdealPitch (void)
{
    prvm_prog_t *prog = SVVM_prog;
    float   angleval, sinval, cosval, step, dir;
    trace_t tr;
    vec3_t  top, bottom;
    float   z[MAX_FORWARD];
    int     i, j;
    int     steps;
 
    if (!((int)PRVM_serveredictfloat(host_client->edict, flags) & FL_ONGROUND))
        return;
 
    angleval = PRVM_serveredictvector(host_client->edict, angles)[YAW] * M_PI*2 / 360;
    sinval = sin(angleval);
    cosval = cos(angleval);
 
    for (i=0 ; i<MAX_FORWARD ; i++)
    {
        top[0] = PRVM_serveredictvector(host_client->edict, origin)[0] + cosval*(i+3)*12;
        top[1] = PRVM_serveredictvector(host_client->edict, origin)[1] + sinval*(i+3)*12;
        top[2] = PRVM_serveredictvector(host_client->edict, origin)[2] + PRVM_serveredictvector(host_client->edict, view_ofs)[2];
 
        bottom[0] = top[0];
        bottom[1] = top[1];
        bottom[2] = top[2] - 160;
 
        tr = SV_TraceLine(top, bottom, MOVE_NOMONSTERS, host_client->edict, SUPERCONTENTS_SOLID, 0, 0, collision_extendmovelength.value);
        // if looking at a wall, leave ideal the way is was
        if (tr.startsolid)
            return;
 
        // near a dropoff
        if (tr.fraction == 1)
            return;
 
        z[i] = top[2] + tr.fraction*(bottom[2]-top[2]);
    }
 
    dir = 0;
    steps = 0;
    for (j=1 ; j<i ; j++)
    {
        step = z[j] - z[j-1];
        if (step > -ON_EPSILON && step < ON_EPSILON)
            continue;
 
        // mixed changes
        if (dir && ( step-dir > ON_EPSILON || step-dir < -ON_EPSILON ) )
            return;
 
        steps++;
        dir = step;
    }
 
    if (!dir)
    {
        PRVM_serveredictfloat(host_client->edict, idealpitch) = 0;
        return;
    }
 
    if (steps < 2)
        return;
    PRVM_serveredictfloat(host_client->edict, idealpitch) = -dir * sv_idealpitchscale.value;
}
 
static vec3_t wishdir, forward, right, up;
static float wishspeed;
 
static qbool onground;
 
/*
==================
SV_UserFriction
 
==================
*/
static void SV_UserFriction (void)
{
    prvm_prog_t *prog = SVVM_prog;
    float speed, newspeed, control, friction;
    vec3_t start, stop;
    trace_t trace;
 
    speed = Vector2Length(PRVM_serveredictvector(host_client->edict, velocity));
    if (!speed)
        return;
 
    // if the leading edge is over a dropoff, increase friction
    start[0] = stop[0] = PRVM_serveredictvector(host_client->edict, origin)[0] + PRVM_serveredictvector(host_client->edict, velocity)[0]/speed*16;
    start[1] = stop[1] = PRVM_serveredictvector(host_client->edict, origin)[1] + PRVM_serveredictvector(host_client->edict, velocity)[1]/speed*16;
    start[2] = PRVM_serveredictvector(host_client->edict, origin)[2] + PRVM_serveredictvector(host_client->edict, mins)[2];
    stop[2] = start[2] - 34;
 
    trace = SV_TraceLine(start, stop, MOVE_NOMONSTERS, host_client->edict, SV_GenericHitSuperContentsMask(host_client->edict), 0, 0, collision_extendmovelength.value);
 
    if (trace.fraction == 1.0)
        friction = sv_friction.value*sv_edgefriction.value;
    else
        friction = sv_friction.value;
 
    // apply friction
    control = speed < sv_stopspeed.value ? sv_stopspeed.value : speed;
    newspeed = speed - sv.frametime*control*friction;
 
    if (newspeed < 0)
        newspeed = 0;
    else
        newspeed /= speed;
 
    VectorScale(PRVM_serveredictvector(host_client->edict, velocity), newspeed, PRVM_serveredictvector(host_client->edict, velocity));
}
 
/*
==============
SV_Accelerate
==============
*/
static void SV_Accelerate (void)
{
    prvm_prog_t *prog = SVVM_prog;
    int i;
    float addspeed, accelspeed, currentspeed;
 
    currentspeed = DotProduct (PRVM_serveredictvector(host_client->edict, velocity), wishdir);
    addspeed = wishspeed - currentspeed;
    if (addspeed <= 0)
        return;
    accelspeed = sv_accelerate.value*sv.frametime*wishspeed;
    if (accelspeed > addspeed)
        accelspeed = addspeed;
 
    for (i=0 ; i<3 ; i++)
        PRVM_serveredictvector(host_client->edict, velocity)[i] += accelspeed*wishdir[i];
}
 
extern cvar_t sv_gameplayfix_q2airaccelerate;
static void SV_AirAccelerate (vec3_t wishveloc)
{
    prvm_prog_t *prog = SVVM_prog;
    int i;
    float addspeed, wishspd, accelspeed, currentspeed;
 
    wishspd = VectorNormalizeLength (wishveloc);
    if (wishspd > sv_maxairspeed.value)
        wishspd = sv_maxairspeed.value;
    currentspeed = DotProduct (PRVM_serveredictvector(host_client->edict, velocity), wishveloc);
    addspeed = wishspd - currentspeed;
    if (addspeed <= 0)
        return;
    accelspeed = (sv_airaccelerate.value < 0 ? sv_accelerate.value : sv_airaccelerate.value)*(sv_gameplayfix_q2airaccelerate.integer ? wishspd : wishspeed) * sv.frametime;
    if (accelspeed > addspeed)
        accelspeed = addspeed;
 
    for (i=0 ; i<3 ; i++)
        PRVM_serveredictvector(host_client->edict, velocity)[i] += accelspeed*wishveloc[i];
}
 
 
static void DropPunchAngle (void)
{
    prvm_prog_t *prog = SVVM_prog;
    vec_t len;
    vec3_t punchangle, punchvector;
 
    VectorCopy(PRVM_serveredictvector(host_client->edict, punchangle), punchangle);
    VectorCopy(PRVM_serveredictvector(host_client->edict, punchvector), punchvector);
 
    len = VectorNormalizeLength(punchangle);
    if (len > 0)
    {
        len -= 10*sv.frametime;
        if (len < 0)
            len = 0;
        VectorScale(punchangle, len, punchangle);
    }
 
    len = VectorNormalizeLength(punchvector);
    if (len > 0)
    {
        len -= 20*sv.frametime;
        if (len < 0)
            len = 0;
        VectorScale(punchvector, len, punchvector);
    }
 
    VectorCopy(punchangle, PRVM_serveredictvector(host_client->edict, punchangle));
    VectorCopy(punchvector, PRVM_serveredictvector(host_client->edict, punchvector));
}
 
/*
===================
SV_WaterMove
 
===================
*/
static void SV_WaterMove (void)
{
    prvm_prog_t *prog = SVVM_prog;
    int i;
    vec3_t wishvel, v_angle;
    vec_t speed, newspeed, fwishspeed, addspeed, accelspeed, temp;
 
    // user intentions
    VectorCopy(PRVM_serveredictvector(host_client->edict, v_angle), v_angle);
    AngleVectors(v_angle, forward, right, up);
 
    for (i=0 ; i<3 ; i++)
        wishvel[i] = forward[i]*usercmd.forwardmove + right[i]*usercmd.sidemove;
 
    if (!usercmd.forwardmove && !usercmd.sidemove && !usercmd.upmove)
        wishvel[2] -= 60;       // drift towards bottom
    else
        wishvel[2] += usercmd.upmove;
 
    fwishspeed = VectorLength(wishvel);
    if (fwishspeed > sv_maxspeed.value)
    {
        temp = sv_maxspeed.value/fwishspeed;
        VectorScale (wishvel, temp, wishvel);
        fwishspeed = sv_maxspeed.value;
    }
    fwishspeed *= 0.7;
 
    // water friction
    speed = VectorLength(PRVM_serveredictvector(host_client->edict, velocity));
    if (speed)
    {
        newspeed = speed - sv.frametime * speed * (sv_waterfriction.value < 0 ? sv_friction.value : sv_waterfriction.value);
        if (newspeed < 0)
            newspeed = 0;
        temp = newspeed/speed;
        VectorScale(PRVM_serveredictvector(host_client->edict, velocity), temp, PRVM_serveredictvector(host_client->edict, velocity));
    }
    else
        newspeed = 0;
 
    // water acceleration
    if (!fwishspeed)
        return;
 
    addspeed = fwishspeed - newspeed;
    if (addspeed <= 0)
        return;
 
    VectorNormalize (wishvel);
    accelspeed = (sv_wateraccelerate.value < 0 ? sv_accelerate.value : sv_wateraccelerate.value) * fwishspeed * sv.frametime;
    if (accelspeed > addspeed)
        accelspeed = addspeed;
 
    for (i=0 ; i<3 ; i++)
        PRVM_serveredictvector(host_client->edict, velocity)[i] += accelspeed * wishvel[i];
}
 
static void SV_WaterJump (void)
{
    prvm_prog_t *prog = SVVM_prog;
    if (sv.time > PRVM_serveredictfloat(host_client->edict, teleport_time) || !PRVM_serveredictfloat(host_client->edict, waterlevel))
    {
        PRVM_serveredictfloat(host_client->edict, flags) = (int)PRVM_serveredictfloat(host_client->edict, flags) & ~FL_WATERJUMP;
        PRVM_serveredictfloat(host_client->edict, teleport_time) = 0;
    }
    PRVM_serveredictvector(host_client->edict, velocity)[0] = PRVM_serveredictvector(host_client->edict, movedir)[0];
    PRVM_serveredictvector(host_client->edict, velocity)[1] = PRVM_serveredictvector(host_client->edict, movedir)[1];
}
 
 
/*
===================
SV_AirMove
 
===================
*/
static void SV_AirMove (void)
{
    prvm_prog_t *prog = SVVM_prog;
    int i;
    vec3_t wishvel;
    float fmove, smove, temp;
 
    // LadyHavoc: correct quake movement speed bug when looking up/down
    wishvel[0] = wishvel[2] = 0;
    wishvel[1] = PRVM_serveredictvector(host_client->edict, angles)[1];
    AngleVectors (wishvel, forward, right, up);
 
    fmove = usercmd.forwardmove;
    smove = usercmd.sidemove;
 
// hack to not let you back into teleporter
    if (sv.time < PRVM_serveredictfloat(host_client->edict, teleport_time) && fmove < 0)
        fmove = 0;
 
    for (i=0 ; i<3 ; i++)
        wishvel[i] = forward[i]*fmove + right[i]*smove;
 
    if ((int)PRVM_serveredictfloat(host_client->edict, movetype) != MOVETYPE_WALK)
        wishvel[2] += usercmd.upmove;
 
    VectorCopy (wishvel, wishdir);
    wishspeed = VectorNormalizeLength(wishdir);
    if (wishspeed > sv_maxspeed.value)
    {
        temp = sv_maxspeed.value/wishspeed;
        VectorScale (wishvel, temp, wishvel);
        wishspeed = sv_maxspeed.value;
    }
 
    if (PRVM_serveredictfloat(host_client->edict, movetype) == MOVETYPE_NOCLIP)
    {
        // noclip
        VectorCopy (wishvel, PRVM_serveredictvector(host_client->edict, velocity));
    }
    else if (onground)
    {
        SV_UserFriction ();
        SV_Accelerate ();
    }
    else
    {
        // not on ground, so little effect on velocity
        SV_AirAccelerate (wishvel);
    }
}
 
/*
===================
SV_PlayerPhysics
 
the move fields specify an intended velocity in pix/sec
the angle fields specify an exact angular motion in degrees
===================
*/
void SV_PlayerPhysics (void)
{
    prvm_prog_t *prog = SVVM_prog;
    vec3_t v_angle, angles, velocity;
 
    //Con_Printf("clientthink for %ims\n", (int) (sv.frametime * 1000));
 
    SV_ApplyClientMove();
    // make sure the velocity is sane (not a NaN)
    SV_CheckVelocity(host_client->edict);
 
    // LadyHavoc: QuakeC replacement for SV_PlayerPhysics (player movement)
    if (PRVM_serverfunction(SV_PlayerPhysics) && sv_playerphysicsqc.integer)
    {
        PRVM_serverglobalfloat(time) = sv.time;
        PRVM_serverglobaledict(self) = PRVM_EDICT_TO_PROG(host_client->edict);
        prog->ExecuteProgram(prog, PRVM_serverfunction(SV_PlayerPhysics), "QC function SV_PlayerPhysics is missing");
        SV_CheckVelocity(host_client->edict);
        return;
    }
 
    if (PRVM_serveredictfloat(host_client->edict, movetype) == MOVETYPE_NONE)
        return;
 
    onground = ((int)PRVM_serveredictfloat(host_client->edict, flags) & FL_ONGROUND) != 0;
 
    DropPunchAngle ();
 
    // if dead, behave differently
    if (PRVM_serveredictfloat(host_client->edict, health) <= 0)
        return;
 
    usercmd = host_client->cmd;
 
    // angles
    // show 1/3 the pitch angle and all the roll angle
    VectorAdd (PRVM_serveredictvector(host_client->edict, v_angle), PRVM_serveredictvector(host_client->edict, punchangle), v_angle);
    VectorCopy(PRVM_serveredictvector(host_client->edict, angles), angles);
    VectorCopy(PRVM_serveredictvector(host_client->edict, velocity), velocity);
    PRVM_serveredictvector(host_client->edict, angles)[ROLL] = Com_CalcRoll (angles, velocity, sv_rollangle.value, sv_rollspeed.value)*4;
    if (!PRVM_serveredictfloat(host_client->edict, fixangle))
    {
        PRVM_serveredictvector(host_client->edict, angles)[PITCH] = -v_angle[PITCH]/3;
        PRVM_serveredictvector(host_client->edict, angles)[YAW] = v_angle[YAW];
    }
 
    if ( (int)PRVM_serveredictfloat(host_client->edict, flags) & FL_WATERJUMP )
    {
        SV_WaterJump ();
        SV_CheckVelocity(host_client->edict);
        return;
    }
 
    // walk
    if ((PRVM_serveredictfloat(host_client->edict, waterlevel) >= 2) && (PRVM_serveredictfloat(host_client->edict, movetype) != MOVETYPE_NOCLIP))
    {
        SV_WaterMove ();
        SV_CheckVelocity(host_client->edict);
        return;
    }
 
    SV_AirMove ();
    SV_CheckVelocity(host_client->edict);
}
 
/*
===================
SV_ReadClientMove
===================
*/
int sv_numreadmoves = 0;
usercmd_t sv_readmoves[CL_MAX_USERCMDS];
static void SV_ReadClientMove (void)
{
    prvm_prog_t *prog = SVVM_prog;
    int i;
    usercmd_t newmove;
    usercmd_t *move = &newmove;
 
    memset(move, 0, sizeof(*move));
 
    if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 
    // read ping time
    if (sv.protocol != PROTOCOL_QUAKE && sv.protocol != PROTOCOL_QUAKEDP && sv.protocol != PROTOCOL_NEHAHRAMOVIE && sv.protocol != PROTOCOL_NEHAHRABJP && sv.protocol != PROTOCOL_NEHAHRABJP2 && sv.protocol != PROTOCOL_NEHAHRABJP3 && sv.protocol != PROTOCOL_DARKPLACES1 && sv.protocol != PROTOCOL_DARKPLACES2 && sv.protocol != PROTOCOL_DARKPLACES3 && sv.protocol != PROTOCOL_DARKPLACES4 && sv.protocol != PROTOCOL_DARKPLACES5 && sv.protocol != PROTOCOL_DARKPLACES6)
        move->sequence = MSG_ReadLong(&sv_message);
    move->time = MSG_ReadFloat(&sv_message);
    if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
    move->receivetime = (float)sv.time;
 
#if DEBUGMOVES
    Con_Printf("%s move%i #%u %ims (%ims) %i %i '%i %i %i' '%i %i %i'\n", move->time > move->receivetime ? "^3read future" : "^4read normal", sv_numreadmoves + 1, move->sequence, (int)floor((move->time - host_client->cmd.time) * 1000.0 + 0.5), (int)floor(move->time * 1000.0 + 0.5), move->impulse, move->buttons, (int)move->viewangles[0], (int)move->viewangles[1], (int)move->viewangles[2], (int)move->forwardmove, (int)move->sidemove, (int)move->upmove);
#endif
    // limit reported time to current time
    // (incase the client is trying to cheat)
    move->time = min(move->time, sv.time + sv.frametime);
 
    // read current angles
    for (i = 0;i < 3;i++)
    {
        if (sv.protocol == PROTOCOL_QUAKE || sv.protocol == PROTOCOL_QUAKEDP || sv.protocol == PROTOCOL_NEHAHRAMOVIE || sv.protocol == PROTOCOL_NEHAHRABJP || sv.protocol == PROTOCOL_NEHAHRABJP2 || sv.protocol == PROTOCOL_NEHAHRABJP3)
            move->viewangles[i] = MSG_ReadAngle8i(&sv_message);
        else if (sv.protocol == PROTOCOL_DARKPLACES1)
            move->viewangles[i] = MSG_ReadAngle16i(&sv_message);
        else if (sv.protocol == PROTOCOL_DARKPLACES2 || sv.protocol == PROTOCOL_DARKPLACES3)
            move->viewangles[i] = MSG_ReadAngle32f(&sv_message);
        else
            move->viewangles[i] = MSG_ReadAngle16i(&sv_message);
    }
    if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 
    // read movement
    move->forwardmove = MSG_ReadCoord16i(&sv_message);
    move->sidemove = MSG_ReadCoord16i(&sv_message);
    move->upmove = MSG_ReadCoord16i(&sv_message);
    if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 
    // read buttons
    // be sure to bitwise OR them into the move->buttons because we want to
    // accumulate button presses from multiple packets per actual move
    if (sv.protocol == PROTOCOL_QUAKE || sv.protocol == PROTOCOL_QUAKEDP || sv.protocol == PROTOCOL_NEHAHRAMOVIE || sv.protocol == PROTOCOL_NEHAHRABJP || sv.protocol == PROTOCOL_NEHAHRABJP2 || sv.protocol == PROTOCOL_NEHAHRABJP3 || sv.protocol == PROTOCOL_DARKPLACES1 || sv.protocol == PROTOCOL_DARKPLACES2 || sv.protocol == PROTOCOL_DARKPLACES3 || sv.protocol == PROTOCOL_DARKPLACES4 || sv.protocol == PROTOCOL_DARKPLACES5)
        move->buttons = MSG_ReadByte(&sv_message);
    else
        move->buttons = MSG_ReadLong(&sv_message);
    if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 
    // read impulse
    move->impulse = MSG_ReadByte(&sv_message);
    if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 
    // PRYDON_CLIENTCURSOR
    if (sv.protocol != PROTOCOL_QUAKE && sv.protocol != PROTOCOL_QUAKEDP && sv.protocol != PROTOCOL_NEHAHRAMOVIE && sv.protocol != PROTOCOL_NEHAHRABJP && sv.protocol != PROTOCOL_NEHAHRABJP2 && sv.protocol != PROTOCOL_NEHAHRABJP3 && sv.protocol != PROTOCOL_DARKPLACES1 && sv.protocol != PROTOCOL_DARKPLACES2 && sv.protocol != PROTOCOL_DARKPLACES3 && sv.protocol != PROTOCOL_DARKPLACES4 && sv.protocol != PROTOCOL_DARKPLACES5)
    {
        // 30 bytes
        move->cursor_screen[0] = MSG_ReadShort(&sv_message) * (1.0f / 32767.0f);
        move->cursor_screen[1] = MSG_ReadShort(&sv_message) * (1.0f / 32767.0f);
        move->cursor_start[0] = MSG_ReadFloat(&sv_message);
        move->cursor_start[1] = MSG_ReadFloat(&sv_message);
        move->cursor_start[2] = MSG_ReadFloat(&sv_message);
        move->cursor_impact[0] = MSG_ReadFloat(&sv_message);
        move->cursor_impact[1] = MSG_ReadFloat(&sv_message);
        move->cursor_impact[2] = MSG_ReadFloat(&sv_message);
        move->cursor_entitynumber = (unsigned short)MSG_ReadShort(&sv_message);
        if (move->cursor_entitynumber >= prog->max_edicts)
        {
            Con_DPrintf("SV_ReadClientMessage: client send bad cursor_entitynumber\n");
            move->cursor_entitynumber = 0;
        }
        // as requested by FrikaC, cursor_trace_ent is reset to world if the
        // entity is free at time of receipt
        if (PRVM_EDICT_NUM(move->cursor_entitynumber)->free)
            move->cursor_entitynumber = 0;
        if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
    }
 
    // if the previous move has not been applied yet, we need to accumulate
    // the impulse/buttons from it
    if (!host_client->cmd.applied)
    {
        if (!move->impulse)
            move->impulse = host_client->cmd.impulse;
        move->buttons |= host_client->cmd.buttons;
    }
 
    // now store this move for later execution
    // (we have to buffer the moves because of old ones being repeated)
    if (sv_numreadmoves < CL_MAX_USERCMDS)
        sv_readmoves[sv_numreadmoves++] = *move;
 
    // movement packet loss tracking
    // bones_was_here: checking begun prevents heavy loss detection right after a map change
    if(move->sequence && host_client->begun)
    {
        if(move->sequence > host_client->movement_highestsequence_seen)
        {
            if(host_client->movement_highestsequence_seen)
            {
                // mark moves in between as lost
                unsigned int delta = move->sequence - host_client->movement_highestsequence_seen - 1;
                if(delta < NETGRAPH_PACKETS)
                {
                    unsigned int u;
                    for(u = 0; u < delta; ++u)
                        host_client->movement_count[(host_client->movement_highestsequence_seen + 1 + u) % NETGRAPH_PACKETS] = -1;
                }
                else
                    memset(host_client->movement_count, -1, sizeof(host_client->movement_count));
            }
            // mark THIS move as seen for the first time
            host_client->movement_count[move->sequence % NETGRAPH_PACKETS] = 1;
            // update highest sequence seen
            host_client->movement_highestsequence_seen = move->sequence;
        }
        else
            if(host_client->movement_count[move->sequence % NETGRAPH_PACKETS] >= 0)
                ++host_client->movement_count[move->sequence % NETGRAPH_PACKETS];
    }
    else
    {
        host_client->movement_highestsequence_seen = 0;
        memset(host_client->movement_count, 0, sizeof(host_client->movement_count));
    }
}
 
static void SV_ExecuteClientMoves(void)
{
    prvm_prog_t *prog = SVVM_prog;
    int moveindex;
    double moveframetime;
    double oldframetime;
    double oldframetime2;
 
    if (sv_numreadmoves < 1)
        return;
    // only start accepting input once the player is spawned
    if (!host_client->begun)
        return;
#if DEBUGMOVES
    Con_Printf("SV_ExecuteClientMoves: read %i moves at sv.time %f\n", sv_numreadmoves, (float)sv.time);
#endif
    // disable clientside movement prediction in some cases
    if (ceil(max(sv_readmoves[sv_numreadmoves-1].receivetime - sv_readmoves[sv_numreadmoves-1].time, 0) * 1000.0) < sv_clmovement_minping.integer)
        host_client->clmovement_disabletimeout = host.realtime + sv_clmovement_minping_disabletime.value / 1000.0;
    // several conditions govern whether clientside movement prediction is allowed
    if (sv_readmoves[sv_numreadmoves-1].sequence && sv_clmovement_enable.integer && sv_clmovement_inputtimeout.value > 0 && host_client->clmovement_disabletimeout <= host.realtime && (PRVM_serveredictfloat(host_client->edict, disableclientprediction) == -1 || (PRVM_serveredictfloat(host_client->edict, movetype) == MOVETYPE_WALK && (!PRVM_serveredictfloat(host_client->edict, disableclientprediction)))))
    {
        // process the moves in order and ignore old ones
        // but always trust the latest move
        // (this deals with bogus initial move sequences after level change,
        //  where the client will eventually catch up with the level change
        //  and reset its move sequence)
        for (moveindex = 0;moveindex < sv_numreadmoves;moveindex++)
        {
            usercmd_t *move = sv_readmoves + moveindex;
            if (host_client->movesequence < move->sequence || moveindex == sv_numreadmoves - 1)
            {
#if DEBUGMOVES
                Con_Printf("%smove #%u %ims (%ims) %i %i '%i %i %i' '%i %i %i'\n", (move->time - host_client->cmd.time) > sv.frametime * 1.01 ? "^1" : "^2", move->sequence, (int)floor((move->time - host_client->cmd.time) * 1000.0 + 0.5), (int)floor(move->time * 1000.0 + 0.5), move->impulse, move->buttons, (int)move->viewangles[0], (int)move->viewangles[1], (int)move->viewangles[2], (int)move->forwardmove, (int)move->sidemove, (int)move->upmove);
#endif
                // this is a new move
                move->time = bound(sv.time - 1, move->time, sv.time); // prevent slowhack/speedhack combos
                move->time = max(move->time, host_client->cmd.time); // prevent backstepping of time
                // bones_was_here: limit moveframetime to a multiple of sv.frametime to match inputtimeout behaviour
                moveframetime = min(move->time - host_client->cmd.time, min(0.1, sys_ticrate.value > 0.0 && sv.frametime > 0.0 ? sv.frametime * ceil(sv_clmovement_inputtimeout.value / sv.frametime) : sv_clmovement_inputtimeout.value));
 
 
                // discard (treat like lost) moves with too low distance from
                // the previous one to prevent hacks using float inaccuracy
                // clients will see this as packet loss in the netgraph
                // this should also apply if a move cannot get
                // executed because it came too late and
                // already was performed serverside
                if(moveframetime < 0.0005)
                {
                    // count the move as LOST if we don't
                    // execute it but it has higher
                    // sequence count
                    if(host_client->movesequence)
                        if(move->sequence > host_client->movesequence)
                            host_client->movement_count[(move->sequence) % NETGRAPH_PACKETS] = -1;
                    continue;
                }
 
                //Con_Printf("movesequence = %i (%i lost), moveframetime = %f\n", move->sequence, move->sequence ? move->sequence - host_client->movesequence - 1 : 0, moveframetime);
                host_client->cmd = *move;
                host_client->movesequence = move->sequence;
 
                // if using prediction, we need to perform moves when packets are
                // received, even if multiple occur in one frame
                // (they can't go beyond the current time so there is no cheat issue
                //  with this approach, and if they don't send input for a while they
                //  start moving anyway, so the longest 'lagaport' possible is
                //  determined by the sv_clmovement_inputtimeout cvar)
                oldframetime = PRVM_serverglobalfloat(frametime);
                oldframetime2 = sv.frametime;
                // update ping time for qc to see while executing this move
                host_client->ping = host_client->cmd.receivetime - host_client->cmd.time;
                // the server and qc frametime values must be changed temporarily
                PRVM_serverglobalfloat(frametime) = sv.frametime = moveframetime;
                // if move is more than 50ms, split it into two moves (this matches QWSV behavior and the client prediction)
                if (sv.frametime > 0.05)
                {
                    PRVM_serverglobalfloat(frametime) = sv.frametime = moveframetime * 0.5f;
                    SV_Physics_ClientMove();
                }
                SV_Physics_ClientMove();
                sv.frametime = oldframetime2;
                PRVM_serverglobalfloat(frametime) = oldframetime;
                host_client->clmovement_inputtimeout = min(0.1, sv_clmovement_inputtimeout.value);
            }
        }
    }
    else
    {
        // try to gather button bits from old moves, but only if their time is
        // advancing (ones with the same timestamp can't be trusted)
        for (moveindex = 0;moveindex < sv_numreadmoves-1;moveindex++)
        {
            usercmd_t *move = sv_readmoves + moveindex;
            if (host_client->cmd.time < move->time)
            {
                sv_readmoves[sv_numreadmoves-1].buttons |= move->buttons;
                if (move->impulse)
                    sv_readmoves[sv_numreadmoves-1].impulse = move->impulse;
            }
        }
        // now copy the new move
        host_client->cmd = sv_readmoves[sv_numreadmoves-1];
        host_client->cmd.time = max(host_client->cmd.time, sv.time);
            // physics will run up to sv.time, so allow no predicted moves
            // before that otherwise, there is a speedhack by turning
            // prediction on and off repeatedly on client side because the
            // engine would run BOTH client and server physics for the same
            // time
        host_client->movesequence = 0;
        // make sure that normal physics takes over immediately
        host_client->clmovement_inputtimeout = 0;
        // update ping time
        host_client->ping = host_client->cmd.receivetime - sv_readmoves[sv_numreadmoves-1].time;
    }
}
 
void SV_ApplyClientMove (void)
{
    prvm_prog_t *prog = SVVM_prog;
    usercmd_t *move = &host_client->cmd;
    int j, movementloss, packetloss;
 
    if (!move->receivetime)
        return;
 
    // note: a move can be applied multiple times if the client packets are
    // not coming as often as the physics is executed, and the move must be
    // applied before running qc each time because the id1 qc had a bug where
    // it clears self.button2 in PlayerJump, causing pogostick behavior if
    // moves are not applied every time before calling qc
    move->applied = true;
 
    // set the edict fields
    PRVM_serveredictfloat(host_client->edict, button0) = move->buttons & 1;
    PRVM_serveredictfloat(host_client->edict, button2) = (move->buttons & 2)>>1;
    if (move->impulse)
        PRVM_serveredictfloat(host_client->edict, impulse) = move->impulse;
    // only send the impulse to qc once
    move->impulse = 0;
 
    movementloss = packetloss = 0;
    if(host_client->netconnection)
    {
        for (j = 0;j < NETGRAPH_PACKETS;j++)
            if (host_client->netconnection->incoming_netgraph[j].unreliablebytes == NETGRAPH_LOSTPACKET)
                packetloss++;
        for (j = 0;j < NETGRAPH_PACKETS;j++)
            if (host_client->movement_count[j] < 0)
                movementloss++;
    }
 
    VectorCopy(move->viewangles, PRVM_serveredictvector(host_client->edict, v_angle));
    PRVM_serveredictfloat(host_client->edict, button3) = ((move->buttons >> 2) & 1);
    PRVM_serveredictfloat(host_client->edict, button4) = ((move->buttons >> 3) & 1);
    PRVM_serveredictfloat(host_client->edict, button5) = ((move->buttons >> 4) & 1);
    PRVM_serveredictfloat(host_client->edict, button6) = ((move->buttons >> 5) & 1);
    PRVM_serveredictfloat(host_client->edict, button7) = ((move->buttons >> 6) & 1);
    PRVM_serveredictfloat(host_client->edict, button8) = ((move->buttons >> 7) & 1);
    PRVM_serveredictfloat(host_client->edict, button9) = ((move->buttons >> 11) & 1);
    PRVM_serveredictfloat(host_client->edict, button10) = ((move->buttons >> 12) & 1);
    PRVM_serveredictfloat(host_client->edict, button11) = ((move->buttons >> 13) & 1);
    PRVM_serveredictfloat(host_client->edict, button12) = ((move->buttons >> 14) & 1);
    PRVM_serveredictfloat(host_client->edict, button13) = ((move->buttons >> 15) & 1);
    PRVM_serveredictfloat(host_client->edict, button14) = ((move->buttons >> 16) & 1);
    PRVM_serveredictfloat(host_client->edict, button15) = ((move->buttons >> 17) & 1);
    PRVM_serveredictfloat(host_client->edict, button16) = ((move->buttons >> 18) & 1);
    PRVM_serveredictfloat(host_client->edict, buttonuse) = ((move->buttons >> 8) & 1);
    PRVM_serveredictfloat(host_client->edict, buttonchat) = ((move->buttons >> 9) & 1);
    PRVM_serveredictfloat(host_client->edict, cursor_active) = ((move->buttons >> 10) & 1);
    VectorSet(PRVM_serveredictvector(host_client->edict, movement), move->forwardmove, move->sidemove, move->upmove);
    VectorCopy(move->cursor_screen, PRVM_serveredictvector(host_client->edict, cursor_screen));
    VectorCopy(move->cursor_start, PRVM_serveredictvector(host_client->edict, cursor_trace_start));
    VectorCopy(move->cursor_impact, PRVM_serveredictvector(host_client->edict, cursor_trace_endpos));
    PRVM_serveredictedict(host_client->edict, cursor_trace_ent) = PRVM_EDICT_TO_PROG(PRVM_EDICT_NUM(move->cursor_entitynumber));
    PRVM_serveredictfloat(host_client->edict, ping) = host_client->ping * 1000.0;
    PRVM_serveredictfloat(host_client->edict, ping_packetloss) = packetloss / (float) NETGRAPH_PACKETS;
    PRVM_serveredictfloat(host_client->edict, ping_movementloss) = movementloss / (float) NETGRAPH_PACKETS;
}
 
static qbool SV_FrameLost(int framenum)
{
    if (host_client->entitydatabase5)
    {
        if (framenum <= host_client->entitydatabase5->latestframenum)
        {
            EntityFrame5_LostFrame(host_client->entitydatabase5, framenum);
            EntityFrameCSQC_LostFrame(host_client, framenum);
            return true;
        }
    }
    return false;
}
 
static void SV_FrameAck(int framenum)
{
    if (host_client->entitydatabase)
        EntityFrame_AckFrame(host_client->entitydatabase, framenum);
    else if (host_client->entitydatabase4)
        EntityFrame4_AckFrame(host_client->entitydatabase4, framenum, true);
    else if (host_client->entitydatabase5)
        EntityFrame5_AckFrame(host_client->entitydatabase5, framenum);
}
 
/*
===================
SV_ReadClientMessage
===================
*/
void SV_ReadClientMessage(void)
{
    prvm_prog_t *prog = SVVM_prog;
    int netcmd, num, start;
    char *s, *p, *q;
    size_t slen;
 
    if(sv_autodemo_perclient.integer >= 2)
        SV_WriteDemoMessage(host_client, &(host_client->netconnection->message), true);
 
    //MSG_BeginReading ();
    sv_numreadmoves = 0;
 
    for(;;)
    {
        if (!host_client->active)
        {
            // a command caused an error
            SV_DropClient (false, "Connection closing");
            return;
        }
 
        if (sv_message.badread)
        {
            Con_Print("SV_ReadClientMessage: badread\n");
            SV_DropClient (false, "An internal server error occurred");
            return;
        }
 
        netcmd = MSG_ReadByte(&sv_message);
        if (netcmd == -1)
        {
            // end of message
            // apply the moves that were read this frame
            SV_ExecuteClientMoves();
            break;
        }
 
        switch (netcmd)
        {
        default:
            Con_Printf("SV_ReadClientMessage: unknown command char %i (at offset 0x%x)\n", netcmd, sv_message.readcount);
            if (developer_networking.integer)
                Com_HexDumpToConsole(sv_message.data, sv_message.cursize);
            SV_DropClient (false, "Unknown message sent to the server");
            return;
 
        case clc_nop:
            break;
 
        case clc_stringcmd:
            // allow reliable messages now as the client is done with initial loading
            if (host_client->sendsignon == 2)
                host_client->sendsignon = 0;
            slen = MSG_ReadString_len(&sv_message, sv_readstring, sizeof(sv_readstring));
            s = sv_readstring;
            q = NULL;
            for(p = s; *p; ++p) switch(*p)
            {
                case 10:
                case 13:
                    if(!q)
                        q = p;
                    break;
                default:
                    if(q)
                        goto clc_stringcmd_invalid; // newline seen, THEN something else -> possible exploit
                    break;
            }
            if(q)
                *q = 0;
            if (strncasecmp(s, "spawn", 5) == 0
             || strncasecmp(s, "begin", 5) == 0
             || strncasecmp(s, "prespawn", 8) == 0)
                Cmd_ExecuteString(cmd_serverfromclient, s, slen, src_client, true);
            else if (PRVM_serverfunction(SV_ParseClientCommand))
            {
                int restorevm_tempstringsbuf_cursize;
                restorevm_tempstringsbuf_cursize = prog->tempstringsbuf.cursize;
                PRVM_G_INT(OFS_PARM0) = PRVM_SetTempString(prog, s, slen);
                PRVM_serverglobalfloat(time) = sv.time;
                PRVM_serverglobaledict(self) = PRVM_EDICT_TO_PROG(host_client->edict);
                prog->ExecuteProgram(prog, PRVM_serverfunction(SV_ParseClientCommand), "QC function SV_ParseClientCommand is missing");
                prog->tempstringsbuf.cursize = restorevm_tempstringsbuf_cursize;
            }
            else
                Cmd_ExecuteString(cmd_serverfromclient, s, slen, src_client, true);
            break;
 
clc_stringcmd_invalid:
            Con_Printf("Received invalid stringcmd from %s\n", host_client->name);
            if(developer.integer > 0)
                Com_HexDumpToConsole((unsigned char *) s, (int)strlen(s));
            break;
 
        case clc_disconnect:
            SV_DropClient (true, sv.protocol == PROTOCOL_DARKPLACES8
                           ? MSG_ReadString(&sv_message, sv_readstring, sizeof(sv_readstring))
                           : "Disconnect by user"); // client wants to disconnect
            return;
 
        case clc_move:
            SV_ReadClientMove();
            break;
 
        case clc_ackdownloaddata:
            start = MSG_ReadLong(&sv_message);
            num = MSG_ReadShort(&sv_message);
            if (host_client->download_file && host_client->download_started)
            {
                if (host_client->download_expectedposition == start)
                {
                    int size = (int)FS_FileSize(host_client->download_file);
                    // a data block was successfully received by the client,
                    // update the expected position on the next data block
                    host_client->download_expectedposition = start + num;
                    // if this was the last data block of the file, it's done
                    if (host_client->download_expectedposition >= FS_FileSize(host_client->download_file))
                    {
                        // tell the client that the download finished
                        // we need to calculate the crc now
                        //
                        // note: at this point the OS probably has the file
                        // entirely in memory, so this is a faster operation
                        // now than it was when the download started.
                        //
                        // it is also preferable to do this at the end of the
                        // download rather than the start because it reduces
                        // potential for Denial Of Service attacks against the
                        // server.
                        int crc;
                        unsigned char *temp;
                        FS_Seek(host_client->download_file, 0, SEEK_SET);
                        temp = (unsigned char *) Mem_Alloc(tempmempool, size);
                        FS_Read(host_client->download_file, temp, size);
                        crc = CRC_Block(temp, size);
                        Mem_Free(temp);
                        // calculated crc, send the file info to the client
                        // (so that it can verify the data)
                        SV_ClientCommands("\ncl_downloadfinished %i %i %s\n", size, crc, host_client->download_name);
                        Con_DPrintf("Download of %s by %s has finished\n", host_client->download_name, host_client->name);
                        FS_Close(host_client->download_file);
                        host_client->download_file = NULL;
                        host_client->download_name[0] = 0;
                        host_client->download_expectedposition = 0;
                        host_client->download_started = false;
                    }
                }
                else
                {
                    // a data block was lost, reset to the expected position
                    // and resume sending from there
                    FS_Seek(host_client->download_file, host_client->download_expectedposition, SEEK_SET);
                }
            }
            break;
 
        case clc_ackframe:
            if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
            num = MSG_ReadLong(&sv_message);
            if (sv_message.badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
            if (developer_networkentities.integer >= 10)
                Con_Printf("recv clc_ackframe %i\n", num);
            // if the client hasn't progressed through signons yet,
            // ignore any clc_ackframes we get (they're probably from the
            // previous level)
            if (host_client->begun && host_client->latestframenum < num)
            {
                int i;
                for (i = host_client->latestframenum + 1;i < num;i++)
                    if (!SV_FrameLost(i))
                        break;
                SV_FrameAck(num);
                host_client->latestframenum = num;
            }
            break;
        }
    }
}