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sv_user.c

/*
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 cmd;
extern cvar_t sv_autodemo_perclient;

/*
===============
SV_SetIdealPitch
===============
*/
#define     MAX_FORWARD 6
void SV_SetIdealPitch (void)
{
      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);
            // 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 qboolean onground;

/*
==================
SV_UserFriction

==================
*/
void SV_UserFriction (void)
{
      float speed, newspeed, control, friction;
      vec3_t start, stop;
      trace_t trace;

      speed = sqrt(PRVM_serveredictvector(host_client->edict, velocity)[0]*PRVM_serveredictvector(host_client->edict, velocity)[0]+PRVM_serveredictvector(host_client->edict, velocity)[1]*PRVM_serveredictvector(host_client->edict, velocity)[1]);
      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));

      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
==============
*/
void SV_Accelerate (void)
{
      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;
void SV_AirAccelerate (vec3_t wishveloc)
{
      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];
}


void DropPunchAngle (void)
{
      float len;
      vec3_t v;

      len = VectorNormalizeLength (PRVM_serveredictvector(host_client->edict, punchangle));

      len -= 10*sv.frametime;
      if (len < 0)
            len = 0;
      VectorScale (PRVM_serveredictvector(host_client->edict, punchangle), len, PRVM_serveredictvector(host_client->edict, punchangle));

      VectorCopy(PRVM_serveredictvector(host_client->edict, punchvector), v);
      len = VectorNormalizeLength(v);
      if (len > 0)
      {
            len -= 20*sv.frametime;
            if (len < 0)
                  len = 0;
            VectorScale(v, len, v);
      }
      VectorCopy(v, PRVM_serveredictvector(host_client->edict, punchvector));
}

/*
===================
SV_FreeMove
===================
*/
void SV_FreeMove (void)
{
      int i;
      float wishspeed;

      AngleVectors (PRVM_serveredictvector(host_client->edict, v_angle), forward, right, up);

      for (i = 0; i < 3; i++)
            PRVM_serveredictvector(host_client->edict, velocity)[i] = forward[i] * cmd.forwardmove + right[i] * cmd.sidemove;

      PRVM_serveredictvector(host_client->edict, velocity)[2] += cmd.upmove;

      wishspeed = VectorLength(PRVM_serveredictvector(host_client->edict, velocity));
      if (wishspeed > sv_maxspeed.value)
            VectorScale(PRVM_serveredictvector(host_client->edict, velocity), sv_maxspeed.value / wishspeed, PRVM_serveredictvector(host_client->edict, velocity));
}

/*
===================
SV_WaterMove

===================
*/
void SV_WaterMove (void)
{
      int i;
      vec3_t wishvel;
      float speed, newspeed, wishspeed, addspeed, accelspeed, temp;

      // user intentions
      AngleVectors (PRVM_serveredictvector(host_client->edict, v_angle), forward, right, up);

      for (i=0 ; i<3 ; i++)
            wishvel[i] = forward[i]*cmd.forwardmove + right[i]*cmd.sidemove;

      if (!cmd.forwardmove && !cmd.sidemove && !cmd.upmove)
            wishvel[2] -= 60;       // drift towards bottom
      else
            wishvel[2] += cmd.upmove;

      wishspeed = VectorLength(wishvel);
      if (wishspeed > sv_maxspeed.value)
      {
            temp = sv_maxspeed.value/wishspeed;
            VectorScale (wishvel, temp, wishvel);
            wishspeed = sv_maxspeed.value;
      }
      wishspeed *= 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 (!wishspeed)
            return;

      addspeed = wishspeed - newspeed;
      if (addspeed <= 0)
            return;

      VectorNormalize (wishvel);
      accelspeed = (sv_wateraccelerate.value < 0 ? sv_accelerate.value : sv_wateraccelerate.value) * wishspeed * sv.frametime;
      if (accelspeed > addspeed)
            accelspeed = addspeed;

      for (i=0 ; i<3 ; i++)
            PRVM_serveredictvector(host_client->edict, velocity)[i] += accelspeed * wishvel[i];
}

void SV_WaterJump (void)
{
      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

===================
*/
void SV_AirMove (void)
{
      int i;
      vec3_t wishvel;
      float fmove, smove, temp;

      // LordHavoc: 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 = cmd.forwardmove;
      smove = cmd.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] += cmd.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_ClientThink

the move fields specify an intended velocity in pix/sec
the angle fields specify an exact angular motion in degrees
===================
*/
void SV_ClientThink (void)
{
      vec3_t v_angle;

      //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);

      // LordHavoc: QuakeC replacement for SV_ClientThink (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);
            PRVM_ExecuteProgram (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;

      cmd = 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);
      PRVM_serveredictvector(host_client->edict, angles)[ROLL] = V_CalcRoll (PRVM_serveredictvector(host_client->edict, angles), PRVM_serveredictvector(host_client->edict, velocity))*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;
      }

      /*
      // Player is (somehow) outside of the map, or flying, or noclipping
      if (PRVM_serveredictfloat(host_client->edict, movetype) != MOVETYPE_NOCLIP && (PRVM_serveredictfloat(host_client->edict, movetype) == MOVETYPE_FLY || SV_TestEntityPosition (host_client->edict)))
      //if (PRVM_serveredictfloat(host_client->edict, movetype) == MOVETYPE_NOCLIP || PRVM_serveredictfloat(host_client->edict, movetype) == MOVETYPE_FLY || SV_TestEntityPosition (host_client->edict))
      {
            SV_FreeMove ();
            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];
void SV_ReadClientMove (void)
{
      int i;
      usercmd_t newmove;
      usercmd_t *move = &newmove;

      memset(move, 0, sizeof(*move));

      if (msg_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 ();
      move->time = move->clienttime = MSG_ReadFloat ();
      if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
      move->receivetime = (float)sv.time;

#if DEBUGMOVES
      Con_Printf("%s move%i #%i %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, move->receivetime + 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();
            else if (sv.protocol == PROTOCOL_DARKPLACES1)
                  move->viewangles[i] = MSG_ReadAngle16i();
            else if (sv.protocol == PROTOCOL_DARKPLACES2 || sv.protocol == PROTOCOL_DARKPLACES3)
                  move->viewangles[i] = MSG_ReadAngle32f();
            else
                  move->viewangles[i] = MSG_ReadAngle16i();
      }
      if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);

      // read movement
      move->forwardmove = MSG_ReadCoord16i ();
      move->sidemove = MSG_ReadCoord16i ();
      move->upmove = MSG_ReadCoord16i ();
      if (msg_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 ();
      else
            move->buttons = MSG_ReadLong ();
      if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);

      // read impulse
      move->impulse = MSG_ReadByte ();
      if (msg_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() * (1.0f / 32767.0f);
            move->cursor_screen[1] = MSG_ReadShort() * (1.0f / 32767.0f);
            move->cursor_start[0] = MSG_ReadFloat();
            move->cursor_start[1] = MSG_ReadFloat();
            move->cursor_start[2] = MSG_ReadFloat();
            move->cursor_impact[0] = MSG_ReadFloat();
            move->cursor_impact[1] = MSG_ReadFloat();
            move->cursor_impact[2] = MSG_ReadFloat();
            move->cursor_entitynumber = (unsigned short)MSG_ReadShort();
            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)->priv.server->free)
                  move->cursor_entitynumber = 0;
            if (msg_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
      if(move->sequence)
      {
            if(move->sequence > host_client->movement_highestsequence_seen)
            {
                  if(host_client->movement_highestsequence_seen)
                  {
                        // mark moves in between as lost
                        if(move->sequence - host_client->movement_highestsequence_seen - 1 < NETGRAPH_PACKETS)
                              for(i = host_client->movement_highestsequence_seen + 1; i < move->sequence; ++i)
                                    host_client->movement_count[i % 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));
      }
}

void SV_ExecuteClientMoves(void)
{
      int moveindex;
      float moveframetime;
      double oldframetime;
      double oldframetime2;
#ifdef NUM_PING_TIMES
      double total;
#endif
      if (sv_numreadmoves < 1)
            return;
      // only start accepting input once the player is spawned
      if (!host_client->spawned)
            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 = 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 <= realtime && 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 #%i %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
                        moveframetime = bound(0, move->time - host_client->cmd.time, min(0.1, 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)
                        if (moveframetime <= 0)
                              continue;
                        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 = 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;
      }

      // calculate average ping time
      host_client->ping = host_client->cmd.receivetime - host_client->cmd.clienttime;
#ifdef NUM_PING_TIMES
      host_client->ping_times[host_client->num_pings % NUM_PING_TIMES] = host_client->cmd.receivetime - host_client->cmd.clienttime;
      host_client->num_pings++;
      for (i=0, total = 0;i < NUM_PING_TIMES;i++)
            total += host_client->ping_times[i];
      host_client->ping = total / NUM_PING_TIMES;
#endif
}

void SV_ApplyClientMove (void)
{
      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;
}

void SV_FrameLost(int framenum)
{
      if (host_client->entitydatabase5)
      {
            EntityFrame5_LostFrame(host_client->entitydatabase5, framenum);
            EntityFrameCSQC_LostFrame(host_client, framenum);
      }
}

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
===================
*/
extern void SV_SendServerinfo(client_t *client);
extern sizebuf_t vm_tempstringsbuf;
void SV_ReadClientMessage(void)
{
      int cmd, num, start;
      char *s, *p, *q;

      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);
                  return;
            }

            if (msg_badread)
            {
                  Con_Print("SV_ReadClientMessage: badread\n");
                  SV_DropClient (false);
                  return;
            }

            cmd = MSG_ReadByte ();
            if (cmd == -1)
            {
                  // end of message
                  // apply the moves that were read this frame
                  SV_ExecuteClientMoves();
                  break;
            }

            switch (cmd)
            {
            default:
                  Con_Printf("SV_ReadClientMessage: unknown command char %i (at offset 0x%x)\n", cmd, msg_readcount);
                  if (developer_networking.integer)
                        Com_HexDumpToConsole(net_message.data, net_message.cursize);
                  SV_DropClient (false);
                  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;
                  s = MSG_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 (s, src_client);
                  else if (PRVM_serverfunction(SV_ParseClientCommand))
                  {
                        int restorevm_tempstringsbuf_cursize;
                        restorevm_tempstringsbuf_cursize = vm_tempstringsbuf.cursize;
                        PRVM_G_INT(OFS_PARM0) = PRVM_SetTempString(s);
                        PRVM_serverglobaledict(self) = PRVM_EDICT_TO_PROG(host_client->edict);
                        PRVM_ExecuteProgram (PRVM_serverfunction(SV_ParseClientCommand), "QC function SV_ParseClientCommand is missing");
                        vm_tempstringsbuf.cursize = restorevm_tempstringsbuf_cursize;
                  }
                  else
                        Cmd_ExecuteString (s, src_client);
                  break;

clc_stringcmd_invalid:
                  Con_Printf("Received invalid stringcmd from %s\n", host_client->name);
                  if(developer.integer > 0)
                        Com_HexDumpToConsole((unsigned char *) s, strlen(s));
                  break;

            case clc_disconnect:
                  SV_DropClient (false); // client wants to disconnect
                  return;

            case clc_move:
                  SV_ReadClientMove();
                  break;

            case clc_ackdownloaddata:
                  start = MSG_ReadLong();
                  num = MSG_ReadShort();
                  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)
                                    Host_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 (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
                  num = MSG_ReadLong();
                  if (msg_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->spawned && host_client->latestframenum < num)
                  {
                        int i;
                        for (i = host_client->latestframenum + 1;i < num;i++)
                              SV_FrameLost(i);
                        SV_FrameAck(num);
                        host_client->latestframenum = num;
                  }
                  break;
            }
      }
}


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