forked from id-Software/Quake-III-Arena
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msg.c
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msg.c
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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code 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.
Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "q_shared.h"
#include "qcommon.h"
static huffman_t msgHuff;
static qboolean msgInit = qfalse;
int pcount[256];
/*
==============================================================================
MESSAGE IO FUNCTIONS
Handles byte ordering and avoids alignment errors
==============================================================================
*/
int oldsize = 0;
void MSG_initHuffman( void );
void MSG_Init( msg_t *buf, byte *data, int length ) {
if (!msgInit) {
MSG_initHuffman();
}
Com_Memset (buf, 0, sizeof(*buf));
buf->data = data;
buf->maxsize = length;
}
void MSG_InitOOB( msg_t *buf, byte *data, int length ) {
if (!msgInit) {
MSG_initHuffman();
}
Com_Memset (buf, 0, sizeof(*buf));
buf->data = data;
buf->maxsize = length;
buf->oob = qtrue;
}
void MSG_Clear( msg_t *buf ) {
buf->cursize = 0;
buf->overflowed = qfalse;
buf->bit = 0; //<- in bits
}
void MSG_Bitstream( msg_t *buf ) {
buf->oob = qfalse;
}
void MSG_BeginReading( msg_t *msg ) {
msg->readcount = 0;
msg->bit = 0;
msg->oob = qfalse;
}
void MSG_BeginReadingOOB( msg_t *msg ) {
msg->readcount = 0;
msg->bit = 0;
msg->oob = qtrue;
}
void MSG_Copy(msg_t *buf, byte *data, int length, msg_t *src)
{
if (length<src->cursize) {
Com_Error( ERR_DROP, "MSG_Copy: can't copy into a smaller msg_t buffer");
}
Com_Memcpy(buf, src, sizeof(msg_t));
buf->data = data;
Com_Memcpy(buf->data, src->data, src->cursize);
}
/*
=============================================================================
bit functions
=============================================================================
*/
// negative bit values include signs
void MSG_WriteBits( msg_t *msg, int value, int bits ) {
int i;
oldsize += bits;
if ( msg->overflowed ) {
return;
}
if ( bits == 0 || bits < -31 || bits > 32 ) {
Com_Error( ERR_DROP, "MSG_WriteBits: bad bits %i", bits );
}
if ( bits < 0 ) {
bits = -bits;
}
if ( msg->oob ) {
if ( msg->cursize + ( bits >> 3 ) > msg->maxsize ) {
msg->overflowed = qtrue;
return;
}
if ( bits == 8 ) {
msg->data[msg->cursize] = value;
msg->cursize += 1;
msg->bit += 8;
} else if ( bits == 16 ) {
short temp = value;
CopyLittleShort( &msg->data[msg->cursize], &temp );
msg->cursize += 2;
msg->bit += 16;
} else if ( bits==32 ) {
CopyLittleLong( &msg->data[msg->cursize], &value );
msg->cursize += 4;
msg->bit += 32;
} else {
Com_Error( ERR_DROP, "can't write %d bits", bits );
}
} else {
value &= (0xffffffff >> (32 - bits));
if ( bits&7 ) {
int nbits;
nbits = bits&7;
if ( msg->bit + nbits > msg->maxsize << 3 ) {
msg->overflowed = qtrue;
return;
}
for( i = 0; i < nbits; i++ ) {
Huff_putBit( (value & 1), msg->data, &msg->bit );
value = (value >> 1);
}
bits = bits - nbits;
}
if ( bits ) {
for( i = 0; i < bits; i += 8 ) {
Huff_offsetTransmit( &msgHuff.compressor, (value & 0xff), msg->data, &msg->bit, msg->maxsize << 3 );
value = (value >> 8);
if ( msg->bit > msg->maxsize << 3 ) {
msg->overflowed = qtrue;
return;
}
}
}
msg->cursize = (msg->bit >> 3) + 1;
}
}
int MSG_ReadBits( msg_t *msg, int bits ) {
int value;
int get;
qboolean sgn;
int i, nbits;
// FILE* fp;
if ( msg->readcount > msg->cursize ) {
return 0;
}
value = 0;
if ( bits < 0 ) {
bits = -bits;
sgn = qtrue;
} else {
sgn = qfalse;
}
if (msg->oob) {
if (msg->readcount + (bits>>3) > msg->cursize) {
msg->readcount = msg->cursize + 1;
return 0;
}
if(bits==8)
{
value = msg->data[msg->readcount];
msg->readcount += 1;
msg->bit += 8;
}
else if(bits==16)
{
short temp;
CopyLittleShort(&temp, &msg->data[msg->readcount]);
value = temp;
msg->readcount += 2;
msg->bit += 16;
}
else if(bits==32)
{
CopyLittleLong(&value, &msg->data[msg->readcount]);
msg->readcount += 4;
msg->bit += 32;
}
else
Com_Error(ERR_DROP, "can't read %d bits", bits);
} else {
nbits = 0;
if (bits&7) {
nbits = bits&7;
if (msg->bit + nbits > msg->cursize << 3) {
msg->readcount = msg->cursize + 1;
return 0;
}
for(i=0;i<nbits;i++) {
value |= (Huff_getBit(msg->data, &msg->bit)<<i);
}
bits = bits - nbits;
}
if (bits) {
// fp = fopen("c:\\netchan.bin", "a");
for(i=0;i<bits;i+=8) {
Huff_offsetReceive (msgHuff.decompressor.tree, &get, msg->data, &msg->bit, msg->cursize<<3);
// fwrite(&get, 1, 1, fp);
value = (unsigned int)value | ((unsigned int)get<<(i+nbits));
if (msg->bit > msg->cursize<<3) {
msg->readcount = msg->cursize + 1;
return 0;
}
}
// fclose(fp);
}
msg->readcount = (msg->bit>>3)+1;
}
if ( sgn && bits > 0 && bits < 32 ) {
if ( value & ( 1 << ( bits - 1 ) ) ) {
value |= -1 ^ ( ( 1 << bits ) - 1 );
}
}
return value;
}
//================================================================================
//
// writing functions
//
void MSG_WriteChar( msg_t *sb, int c ) {
#ifdef PARANOID
if (c < -128 || c > 127)
Com_Error (ERR_FATAL, "MSG_WriteChar: range error");
#endif
MSG_WriteBits( sb, c, 8 );
}
void MSG_WriteByte( msg_t *sb, int c ) {
#ifdef PARANOID
if (c < 0 || c > 255)
Com_Error (ERR_FATAL, "MSG_WriteByte: range error");
#endif
MSG_WriteBits( sb, c, 8 );
}
void MSG_WriteData( msg_t *buf, const void *data, int length ) {
int i;
for(i=0;i<length;i++) {
MSG_WriteByte(buf, ((byte *)data)[i]);
}
}
void MSG_WriteShort( msg_t *sb, int c ) {
#ifdef PARANOID
if (c < ((short)0x8000) || c > (short)0x7fff)
Com_Error (ERR_FATAL, "MSG_WriteShort: range error");
#endif
MSG_WriteBits( sb, c, 16 );
}
void MSG_WriteLong( msg_t *sb, int c ) {
MSG_WriteBits( sb, c, 32 );
}
void MSG_WriteFloat( msg_t *sb, float f ) {
floatint_t dat;
dat.f = f;
MSG_WriteBits( sb, dat.i, 32 );
}
void MSG_WriteString( msg_t *sb, const char *s ) {
if ( !s ) {
MSG_WriteData (sb, "", 1);
} else {
int l,i;
char string[MAX_STRING_CHARS];
l = strlen( s );
if ( l >= MAX_STRING_CHARS ) {
Com_Printf( "MSG_WriteString: MAX_STRING_CHARS" );
MSG_WriteData (sb, "", 1);
return;
}
Q_strncpyz( string, s, sizeof( string ) );
// get rid of 0x80+ and '%' chars, because old clients don't like them
for ( i = 0 ; i < l ; i++ ) {
if ( ((byte *)string)[i] > 127 || string[i] == '%' ) {
string[i] = '.';
}
}
MSG_WriteData (sb, string, l+1);
}
}
void MSG_WriteBigString( msg_t *sb, const char *s ) {
if ( !s ) {
MSG_WriteData (sb, "", 1);
} else {
int l,i;
char string[BIG_INFO_STRING];
l = strlen( s );
if ( l >= BIG_INFO_STRING ) {
Com_Printf( "MSG_WriteString: BIG_INFO_STRING" );
MSG_WriteData (sb, "", 1);
return;
}
Q_strncpyz( string, s, sizeof( string ) );
// get rid of 0x80+ and '%' chars, because old clients don't like them
for ( i = 0 ; i < l ; i++ ) {
if ( ((byte *)string)[i] > 127 || string[i] == '%' ) {
string[i] = '.';
}
}
MSG_WriteData (sb, string, l+1);
}
}
void MSG_WriteAngle( msg_t *sb, float f ) {
MSG_WriteByte (sb, (int)(f*256/360) & 255);
}
void MSG_WriteAngle16( msg_t *sb, float f ) {
MSG_WriteShort (sb, ANGLE2SHORT(f));
}
//============================================================
//
// reading functions
//
// returns -1 if no more characters are available
int MSG_ReadChar (msg_t *msg ) {
int c;
c = (signed char)MSG_ReadBits( msg, 8 );
if ( msg->readcount > msg->cursize ) {
c = -1;
}
return c;
}
int MSG_ReadByte( msg_t *msg ) {
int c;
c = (unsigned char)MSG_ReadBits( msg, 8 );
if ( msg->readcount > msg->cursize ) {
c = -1;
}
return c;
}
int MSG_LookaheadByte( msg_t *msg ) {
const int bloc = Huff_getBloc();
const int readcount = msg->readcount;
const int bit = msg->bit;
int c = MSG_ReadByte(msg);
Huff_setBloc(bloc);
msg->readcount = readcount;
msg->bit = bit;
return c;
}
int MSG_ReadShort( msg_t *msg ) {
int c;
c = (short)MSG_ReadBits( msg, 16 );
if ( msg->readcount > msg->cursize ) {
c = -1;
}
return c;
}
int MSG_ReadLong( msg_t *msg ) {
int c;
c = MSG_ReadBits( msg, 32 );
if ( msg->readcount > msg->cursize ) {
c = -1;
}
return c;
}
float MSG_ReadFloat( msg_t *msg ) {
floatint_t dat;
dat.i = MSG_ReadBits( msg, 32 );
if ( msg->readcount > msg->cursize ) {
dat.f = -1;
}
return dat.f;
}
char *MSG_ReadString( msg_t *msg ) {
static char string[MAX_STRING_CHARS];
int l,c;
l = 0;
do {
c = MSG_ReadByte(msg); // use ReadByte so -1 is out of bounds
if ( c == -1 || c == 0 ) {
break;
}
// translate all fmt spec to avoid crash bugs
if ( c == '%' ) {
c = '.';
}
// don't allow higher ascii values
if ( c > 127 ) {
c = '.';
}
// break only after reading all expected data from bitstream
if ( l >= sizeof(string)-1 ) {
break;
}
string[l++] = c;
} while (1);
string[l] = '\0';
return string;
}
char *MSG_ReadBigString( msg_t *msg ) {
static char string[BIG_INFO_STRING];
int l,c;
l = 0;
do {
c = MSG_ReadByte(msg); // use ReadByte so -1 is out of bounds
if ( c == -1 || c == 0 ) {
break;
}
// translate all fmt spec to avoid crash bugs
if ( c == '%' ) {
c = '.';
}
// don't allow higher ascii values
if ( c > 127 ) {
c = '.';
}
// break only after reading all expected data from bitstream
if ( l >= sizeof(string)-1 ) {
break;
}
string[l++] = c;
} while (1);
string[l] = '\0';
return string;
}
char *MSG_ReadStringLine( msg_t *msg ) {
static char string[MAX_STRING_CHARS];
int l,c;
l = 0;
do {
c = MSG_ReadByte(msg); // use ReadByte so -1 is out of bounds
if (c == -1 || c == 0 || c == '\n') {
break;
}
// translate all fmt spec to avoid crash bugs
if ( c == '%' ) {
c = '.';
}
// don't allow higher ascii values
if ( c > 127 ) {
c = '.';
}
// break only after reading all expected data from bitstream
if ( l >= sizeof(string)-1 ) {
break;
}
string[l++] = c;
} while (1);
string[l] = '\0';
return string;
}
float MSG_ReadAngle16( msg_t *msg ) {
return SHORT2ANGLE(MSG_ReadShort(msg));
}
void MSG_ReadData( msg_t *msg, void *data, int len ) {
int i;
for (i=0 ; i<len ; i++) {
((byte *)data)[i] = MSG_ReadByte (msg);
}
}
// a string hasher which gives the same hash value even if the
// string is later modified via the legacy MSG read/write code
int MSG_HashKey(const char *string, int maxlen) {
int hash, i;
hash = 0;
for (i = 0; i < maxlen && string[i] != '\0'; i++) {
if (string[i] & 0x80 || string[i] == '%')
hash += '.' * (119 + i);
else
hash += string[i] * (119 + i);
}
hash = (hash ^ (hash >> 10) ^ (hash >> 20));
return hash;
}
extern cvar_t *cl_shownet;
#define LOG(x) if( cl_shownet && cl_shownet->integer == 4 ) { Com_Printf("%s ", x ); };
/*
=============================================================================
delta functions with keys
=============================================================================
*/
int kbitmask[32] = {
0x00000001, 0x00000003, 0x00000007, 0x0000000F,
0x0000001F, 0x0000003F, 0x0000007F, 0x000000FF,
0x000001FF, 0x000003FF, 0x000007FF, 0x00000FFF,
0x00001FFF, 0x00003FFF, 0x00007FFF, 0x0000FFFF,
0x0001FFFF, 0x0003FFFF, 0x0007FFFF, 0x000FFFFF,
0x001FFFFf, 0x003FFFFF, 0x007FFFFF, 0x00FFFFFF,
0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF, 0x0FFFFFFF,
0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF, 0xFFFFFFFF,
};
void MSG_WriteDeltaKey( msg_t *msg, int key, int oldV, int newV, int bits ) {
if ( oldV == newV ) {
MSG_WriteBits( msg, 0, 1 );
return;
}
MSG_WriteBits( msg, 1, 1 );
MSG_WriteBits( msg, newV ^ key, bits );
}
int MSG_ReadDeltaKey( msg_t *msg, int key, int oldV, int bits ) {
if ( MSG_ReadBits( msg, 1 ) ) {
return MSG_ReadBits( msg, bits ) ^ (key & kbitmask[ bits - 1 ]);
}
return oldV;
}
void MSG_WriteDeltaKeyFloat( msg_t *msg, int key, float oldV, float newV ) {
floatint_t fi;
if ( oldV == newV ) {
MSG_WriteBits( msg, 0, 1 );
return;
}
fi.f = newV;
MSG_WriteBits( msg, 1, 1 );
MSG_WriteBits( msg, fi.i ^ key, 32 );
}
float MSG_ReadDeltaKeyFloat( msg_t *msg, int key, float oldV ) {
if ( MSG_ReadBits( msg, 1 ) ) {
floatint_t fi;
fi.i = MSG_ReadBits( msg, 32 ) ^ key;
return fi.f;
}
return oldV;
}
/*
============================================================================
usercmd_t communication
============================================================================
*/
/*
=====================
MSG_WriteDeltaUsercmdKey
=====================
*/
void MSG_WriteDeltaUsercmdKey( msg_t *msg, int key, usercmd_t *from, usercmd_t *to ) {
if ( to->serverTime - from->serverTime < 256 ) {
MSG_WriteBits( msg, 1, 1 );
MSG_WriteBits( msg, to->serverTime - from->serverTime, 8 );
} else {
MSG_WriteBits( msg, 0, 1 );
MSG_WriteBits( msg, to->serverTime, 32 );
}
if (from->angles[0] == to->angles[0] &&
from->angles[1] == to->angles[1] &&
from->angles[2] == to->angles[2] &&
from->forwardmove == to->forwardmove &&
from->rightmove == to->rightmove &&
from->upmove == to->upmove &&
from->buttons == to->buttons &&
from->weapon == to->weapon) {
MSG_WriteBits( msg, 0, 1 ); // no change
oldsize += 7;
return;
}
key ^= to->serverTime;
MSG_WriteBits( msg, 1, 1 );
MSG_WriteDeltaKey( msg, key, from->angles[0], to->angles[0], 16 );
MSG_WriteDeltaKey( msg, key, from->angles[1], to->angles[1], 16 );
MSG_WriteDeltaKey( msg, key, from->angles[2], to->angles[2], 16 );
MSG_WriteDeltaKey( msg, key, from->forwardmove, to->forwardmove, 8 );
MSG_WriteDeltaKey( msg, key, from->rightmove, to->rightmove, 8 );
MSG_WriteDeltaKey( msg, key, from->upmove, to->upmove, 8 );
MSG_WriteDeltaKey( msg, key, from->buttons, to->buttons, 16 );
MSG_WriteDeltaKey( msg, key, from->weapon, to->weapon, 8 );
}
/*
=====================
MSG_ReadDeltaUsercmdKey
=====================
*/
void MSG_ReadDeltaUsercmdKey( msg_t *msg, int key, usercmd_t *from, usercmd_t *to ) {
if ( MSG_ReadBits( msg, 1 ) ) {
to->serverTime = from->serverTime + MSG_ReadBits( msg, 8 );
} else {
to->serverTime = MSG_ReadBits( msg, 32 );
}
if ( MSG_ReadBits( msg, 1 ) ) {
key ^= to->serverTime;
to->angles[0] = MSG_ReadDeltaKey( msg, key, from->angles[0], 16);
to->angles[1] = MSG_ReadDeltaKey( msg, key, from->angles[1], 16);
to->angles[2] = MSG_ReadDeltaKey( msg, key, from->angles[2], 16);
to->forwardmove = MSG_ReadDeltaKey( msg, key, from->forwardmove, 8);
if( to->forwardmove == -128 )
to->forwardmove = -127;
to->rightmove = MSG_ReadDeltaKey( msg, key, from->rightmove, 8);
if( to->rightmove == -128 )
to->rightmove = -127;
to->upmove = MSG_ReadDeltaKey( msg, key, from->upmove, 8);
if( to->upmove == -128 )
to->upmove = -127;
to->buttons = MSG_ReadDeltaKey( msg, key, from->buttons, 16);
to->weapon = MSG_ReadDeltaKey( msg, key, from->weapon, 8);
} else {
to->angles[0] = from->angles[0];
to->angles[1] = from->angles[1];
to->angles[2] = from->angles[2];
to->forwardmove = from->forwardmove;
to->rightmove = from->rightmove;
to->upmove = from->upmove;
to->buttons = from->buttons;
to->weapon = from->weapon;
}
}
/*
=============================================================================
entityState_t communication
=============================================================================
*/
/*
=================
MSG_ReportChangeVectors_f
Prints out a table from the current statistics for copying to code
=================
*/
void MSG_ReportChangeVectors_f( void ) {
int i;
for(i=0;i<256;i++) {
if (pcount[i]) {
Com_Printf("%d used %d\n", i, pcount[i]);
}
}
}
typedef struct {
char *name;
int offset;
int bits; // 0 = float
} netField_t;
// using the stringizing operator to save typing...
#define NETF(x) #x,(size_t)&((entityState_t*)0)->x
netField_t entityStateFields[] =
{
{ NETF(pos.trTime), 32 },
{ NETF(pos.trBase[0]), 0 },
{ NETF(pos.trBase[1]), 0 },
{ NETF(pos.trDelta[0]), 0 },
{ NETF(pos.trDelta[1]), 0 },
{ NETF(pos.trBase[2]), 0 },
{ NETF(apos.trBase[1]), 0 },
{ NETF(pos.trDelta[2]), 0 },
{ NETF(apos.trBase[0]), 0 },
{ NETF(event), 10 },
{ NETF(angles2[1]), 0 },
{ NETF(eType), 8 },
{ NETF(torsoAnim), 8 },
{ NETF(eventParm), 8 },
{ NETF(legsAnim), 8 },
{ NETF(groundEntityNum), GENTITYNUM_BITS },
{ NETF(pos.trType), 8 },
{ NETF(eFlags), 19 },
{ NETF(otherEntityNum), GENTITYNUM_BITS },
{ NETF(weapon), 8 },
{ NETF(clientNum), 8 },
{ NETF(angles[1]), 0 },
{ NETF(pos.trDuration), 32 },
{ NETF(apos.trType), 8 },
{ NETF(origin[0]), 0 },
{ NETF(origin[1]), 0 },
{ NETF(origin[2]), 0 },
{ NETF(solid), 24 },
{ NETF(powerups), MAX_POWERUPS },
{ NETF(modelindex), 8 },
{ NETF(otherEntityNum2), GENTITYNUM_BITS },
{ NETF(loopSound), 8 },
{ NETF(generic1), 8 },
{ NETF(origin2[2]), 0 },
{ NETF(origin2[0]), 0 },
{ NETF(origin2[1]), 0 },
{ NETF(modelindex2), 8 },
{ NETF(angles[0]), 0 },
{ NETF(time), 32 },
{ NETF(apos.trTime), 32 },
{ NETF(apos.trDuration), 32 },
{ NETF(apos.trBase[2]), 0 },
{ NETF(apos.trDelta[0]), 0 },
{ NETF(apos.trDelta[1]), 0 },
{ NETF(apos.trDelta[2]), 0 },
{ NETF(time2), 32 },
{ NETF(angles[2]), 0 },
{ NETF(angles2[0]), 0 },
{ NETF(angles2[2]), 0 },
{ NETF(constantLight), 32 },
{ NETF(frame), 16 }
};
// if (int)f == f and (int)f + ( 1<<(FLOAT_INT_BITS-1) ) < ( 1 << FLOAT_INT_BITS )
// the float will be sent with FLOAT_INT_BITS, otherwise all 32 bits will be sent
#define FLOAT_INT_BITS 13
#define FLOAT_INT_BIAS (1<<(FLOAT_INT_BITS-1))
/*
==================
MSG_WriteDeltaEntity
Writes part of a packetentities message, including the entity number.
Can delta from either a baseline or a previous packet_entity
If to is NULL, a remove entity update will be sent
If force is not set, then nothing at all will be generated if the entity is
identical, under the assumption that the in-order delta code will catch it.
==================
*/
void MSG_WriteDeltaEntity( msg_t *msg, struct entityState_s *from, struct entityState_s *to,
qboolean force ) {
int i, lc;
int numFields;
netField_t *field;
int trunc;
float fullFloat;
int *fromF, *toF;
numFields = ARRAY_LEN( entityStateFields );
// all fields should be 32 bits to avoid any compiler packing issues
// the "number" field is not part of the field list
// if this assert fails, someone added a field to the entityState_t
// struct without updating the message fields
assert( numFields + 1 == sizeof( *from )/4 );
// a NULL to is a delta remove message
if ( to == NULL ) {
if ( from == NULL ) {
return;
}
MSG_WriteBits( msg, from->number, GENTITYNUM_BITS );
MSG_WriteBits( msg, 1, 1 );
return;
}
if ( to->number < 0 || to->number >= MAX_GENTITIES ) {
Com_Error (ERR_FATAL, "MSG_WriteDeltaEntity: Bad entity number: %i", to->number );
}
lc = 0;
// build the change vector as bytes so it is endien independent
for ( i = 0, field = entityStateFields ; i < numFields ; i++, field++ ) {
fromF = (int *)( (byte *)from + field->offset );
toF = (int *)( (byte *)to + field->offset );
if ( *fromF != *toF ) {
lc = i+1;
}
}
if ( lc == 0 ) {
// nothing at all changed
if ( !force ) {
return; // nothing at all
}
// write two bits for no change
MSG_WriteBits( msg, to->number, GENTITYNUM_BITS );
MSG_WriteBits( msg, 0, 1 ); // not removed
MSG_WriteBits( msg, 0, 1 ); // no delta
return;
}
MSG_WriteBits( msg, to->number, GENTITYNUM_BITS );
MSG_WriteBits( msg, 0, 1 ); // not removed
MSG_WriteBits( msg, 1, 1 ); // we have a delta
MSG_WriteByte( msg, lc ); // # of changes
oldsize += numFields;
for ( i = 0, field = entityStateFields ; i < lc ; i++, field++ ) {
fromF = (int *)( (byte *)from + field->offset );
toF = (int *)( (byte *)to + field->offset );
if ( *fromF == *toF ) {
MSG_WriteBits( msg, 0, 1 ); // no change
continue;
}
MSG_WriteBits( msg, 1, 1 ); // changed
if ( field->bits == 0 ) {
// float
fullFloat = *(float *)toF;
trunc = (int)fullFloat;
if (fullFloat == 0.0f) {
MSG_WriteBits( msg, 0, 1 );
oldsize += FLOAT_INT_BITS;
} else {
MSG_WriteBits( msg, 1, 1 );
if ( trunc == fullFloat && trunc + FLOAT_INT_BIAS >= 0 &&
trunc + FLOAT_INT_BIAS < ( 1 << FLOAT_INT_BITS ) ) {
// send as small integer
MSG_WriteBits( msg, 0, 1 );
MSG_WriteBits( msg, trunc + FLOAT_INT_BIAS, FLOAT_INT_BITS );
} else {
// send as full floating point value
MSG_WriteBits( msg, 1, 1 );
MSG_WriteBits( msg, *toF, 32 );
}
}
} else {
if (*toF == 0) {
MSG_WriteBits( msg, 0, 1 );
} else {
MSG_WriteBits( msg, 1, 1 );
// integer
MSG_WriteBits( msg, *toF, field->bits );
}
}
}
}
/*
==================
MSG_ReadDeltaEntity
The entity number has already been read from the message, which
is how the from state is identified.
If the delta removes the entity, entityState_t->number will be set to MAX_GENTITIES-1
Can go from either a baseline or a previous packet_entity
==================
*/
void MSG_ReadDeltaEntity( msg_t *msg, entityState_t *from, entityState_t *to,
int number) {
int i, lc;
int numFields;
netField_t *field;
int *fromF, *toF;
int print;
int trunc;
int startBit, endBit;
if ( number < 0 || number >= MAX_GENTITIES) {
Com_Error( ERR_DROP, "Bad delta entity number: %i", number );
}
if ( msg->bit == 0 ) {
startBit = msg->readcount * 8 - GENTITYNUM_BITS;
} else {
startBit = ( msg->readcount - 1 ) * 8 + msg->bit - GENTITYNUM_BITS;
}
// check for a remove
if ( MSG_ReadBits( msg, 1 ) == 1 ) {
Com_Memset( to, 0, sizeof( *to ) );
to->number = MAX_GENTITIES - 1;
if ( cl_shownet && ( cl_shownet->integer >= 2 || cl_shownet->integer == -1 ) ) {
Com_Printf( "%3i: #%-3i remove\n", msg->readcount, number );
}
return;
}
// check for no delta
if ( MSG_ReadBits( msg, 1 ) == 0 ) {
*to = *from;
to->number = number;
return;
}
numFields = ARRAY_LEN( entityStateFields );
lc = MSG_ReadByte(msg);
if ( lc > numFields || lc < 0 ) {
Com_Error( ERR_DROP, "invalid entityState field count" );
}
// shownet 2/3 will interleave with other printed info, -1 will
// just print the delta records`
if ( cl_shownet && ( cl_shownet->integer >= 2 || cl_shownet->integer == -1 ) ) {
print = 1;
Com_Printf( "%3i: #%-3i ", msg->readcount, to->number );
} else {
print = 0;
}
to->number = number;
for ( i = 0, field = entityStateFields ; i < lc ; i++, field++ ) {
fromF = (int *)( (byte *)from + field->offset );
toF = (int *)( (byte *)to + field->offset );
if ( ! MSG_ReadBits( msg, 1 ) ) {
// no change
*toF = *fromF;
} else {
if ( field->bits == 0 ) {
// float
if ( MSG_ReadBits( msg, 1 ) == 0 ) {
*(float *)toF = 0.0f;
} else {