partsyspacket.cpp

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#include "linden_common.h"

#include "partsyspacket.h"
#include "imageids.h"

// this function is global
void gSetInitDataDefaults(LLPartInitData *setMe)
{
        U32 i;

        //for(i = 0; i < 18; i++) 
        //{
        //      setMe->k[i] = 0.0f;
        //}

        //setMe->kill_p[0] = setMe->kill_p[1] = setMe->kill_p[2] = 0.0f;
        //setMe->kill_p[3] = -0.2f; // time parameter, die when t= 5.0f
        //setMe->kill_p[4] = 1.0f;
        //setMe->kill_p[5] = -0.5f; // or radius == 2 (contracting)
        
        //setMe->bounce_p[0] = setMe->bounce_p[1] = 
        //      setMe->bounce_p[2] = setMe->bounce_p[3] = 0.0f;
        //setMe->bounce_p[4] = 1.0f;
        
        setMe->bounce_b = 1.0f;
        // i just changed the meaning of bounce_b
        // its now the attenuation from revlecting your velocity across the normal
        // set by bounce_p
        
        //setMe->pos_ranges[0] = setMe->pos_ranges[2] = setMe->pos_ranges[4] = -1.0f;
        //setMe->pos_ranges[1] = setMe->pos_ranges[3] = setMe->pos_ranges[5] =  1.0f;

        //setMe->vel_ranges[0] = setMe->vel_ranges[2] = setMe->vel_ranges[4] = -1.0f;
        //setMe->vel_ranges[1] = setMe->vel_ranges[3] = setMe->vel_ranges[5] =  1.0f;

        for(i = 0; i < 3; i++) 
        {
                setMe->diffEqAlpha[i] = 0.0f;
                setMe->diffEqScale[i] = 0.0f;
        }

        setMe->scale_range[0] = 1.00f;
        setMe->scale_range[1] = 5.00f;
        setMe->scale_range[2] = setMe->scale_range[3] = 0.0f;

        setMe->alpha_range[0] = setMe->alpha_range[1] = 1.0f;
        setMe->alpha_range[2] = setMe->alpha_range[3] = 0.0f;

        setMe->vel_offset[0] = 0.0f; 
        setMe->vel_offset[1] = 0.0f;
        setMe->vel_offset[2] = 0.0f; 

        // start dropping particles when I'm more then one sim away
        setMe->mDistBeginFadeout = 256.0f;
        setMe->mDistEndFadeout = 1.414f * 512.0f; 
        // stop displaying particles when I'm more then two sim diagonals away

        setMe->mImageUuid = IMG_SHOT;

        for(i = 0; i < 8; i++)
        {
                setMe->mFlags[i] = 0x00;
        }

        setMe->createMe = TRUE;

        setMe->maxParticles = 25;
        setMe->initialParticles = 25;

        //These defaults are for an explosion - a short lived set of debris affected by gravity.
                //Action flags default to PART_SYS_AFFECTED_BY_WIND + PART_SYS_AFFECTED_BY_GRAVITY + PART_SYS_DISTANCE_DEATH 
        setMe->mFlags[PART_SYS_ACTION_BYTE] = PART_SYS_AFFECTED_BY_WIND | PART_SYS_AFFECTED_BY_GRAVITY | PART_SYS_DISTANCE_DEATH;
        setMe->mFlags[PART_SYS_KILL_BYTE] = PART_SYS_DISTANCE_DEATH + PART_SYS_TIME_DEATH;

        setMe->killPlaneNormal[0] = 0.0f;setMe->killPlaneNormal[1] = 0.0f;setMe->killPlaneNormal[2] = 1.0f;             //Straight up
        setMe->killPlaneZ = 0.0f;       //get local ground z as an approximation if turn on PART_SYS_KILL_PLANE
        setMe->bouncePlaneNormal[0] = 0.0f;setMe->bouncePlaneNormal[1] = 0.0f;setMe->bouncePlaneNormal[2] = 1.0f;       //Straight up
        setMe->bouncePlaneZ = 0.0f;     //get local ground z as an approximation if turn on PART_SYS_BOUNCE
        setMe->spawnRange = 1.0f;
        setMe->spawnFrequency = 0.0f;   //Create the instant one dies
        setMe->spawnFreqencyRange = 0.0f;
        setMe->spawnDirection[0] = 0.0f;setMe->spawnDirection[1] = 0.0f;setMe->spawnDirection[2] = 1.0f;                //Straight up
        setMe->spawnDirectionRange = 1.0f;      //global scattering
        setMe->spawnVelocity = 0.75f;
        setMe->spawnVelocityRange = 0.25f;      //velocity +/- 0.25
        setMe->speedLimit = 1.0f;

        setMe->windWeight = 0.5f;       //0.0f means looks like a heavy object (if gravity is on), 1.0f means light and fluffy
        setMe->currentGravity[0] = 0.0f;setMe->currentGravity[1] = 0.0f;setMe->currentGravity[2] = -9.81f;
                //This has to be constant to allow for compression
                
        setMe->gravityWeight = 0.5f;    //0.0f means boyed by air, 1.0f means it's a lead weight
        setMe->globalLifetime = 0.0f;   //Arbitrary, but default is no global die, so doesn't matter
        setMe->individualLifetime = 5.0f;
        setMe->individualLifetimeRange = 1.0f;  //Particles last 5 secs +/- 1
        setMe->alphaDecay = 1.0f;       //normal alpha fadeout
        setMe->scaleDecay = 0.0f;       //no scale decay
        setMe->distanceDeath = 10.0f;   //die if hit unit radius
        setMe->dampMotionFactor = 0.0f;

        setMe->windDiffusionFactor[0] = 0.0f; 
        setMe->windDiffusionFactor[1] = 0.0f;
        setMe->windDiffusionFactor[2] = 0.0f; 
}

LLPartSysCompressedPacket::LLPartSysCompressedPacket()
{
        // default constructor for mDefaults called implicitly/automatically here
        for(int i = 0; i < MAX_PART_SYS_PACKET_SIZE; i++) 
        {
                mData[i] = '\0';
        }

        gSetInitDataDefaults(&mDefaults);
}

LLPartSysCompressedPacket::~LLPartSysCompressedPacket()
{
        // no dynamic data is stored by this class, do nothing.
}

void LLPartSysCompressedPacket::writeFlagByte(LLPartInitData *in)
{
                mData[0] =  mData[1] = mData[2] = '\0';

        U32 i;
        //for(i = 1; i < 18; i++) {
        //      if(in->k[i] != mDefaults.k[i])
        //      {
        //              mData[0] |= PART_SYS_K_MASK;
        //              break;
        //      }
        //}

        if(in->killPlaneZ != mDefaults.killPlaneZ ||
                in->killPlaneNormal[0] != mDefaults.killPlaneNormal[0] || 
                in->killPlaneNormal[1] != mDefaults.killPlaneNormal[1] ||
                in->killPlaneNormal[2] != mDefaults.killPlaneNormal[2] ||
                in->distanceDeath != mDefaults.distanceDeath)
        {
                mData[0] |= PART_SYS_KILL_P_MASK;
        }

        
        
        if(in->bouncePlaneZ != mDefaults.bouncePlaneZ ||
                in->bouncePlaneNormal[0] != mDefaults.bouncePlaneNormal[0] || 
                in->bouncePlaneNormal[1] != mDefaults.bouncePlaneNormal[1] ||
                in->bouncePlaneNormal[2] != mDefaults.bouncePlaneNormal[2])
        {
                mData[0] |= PART_SYS_BOUNCE_P_MASK;
        }
        
        if(in->bounce_b != mDefaults.bounce_b)
        {
                mData[0] |= PART_SYS_BOUNCE_B_MASK;
        }

        
        //if(in->pos_ranges[0] != mDefaults.pos_ranges[0] || in->pos_ranges[1] != mDefaults.pos_ranges[1] ||
        //      in->pos_ranges[2] != mDefaults.pos_ranges[2] || in->pos_ranges[3] != mDefaults.pos_ranges[3] ||
        //      in->pos_ranges[4] != mDefaults.pos_ranges[4] || in->pos_ranges[5] != mDefaults.pos_ranges[5])
        //{
        //      mData[0] |= PART_SYS_POS_RANGES_MASK;
        //}
        
        //if(in->vel_ranges[0] != mDefaults.vel_ranges[0] || in->vel_ranges[1] != mDefaults.vel_ranges[1] ||
        //      in->vel_ranges[2] != mDefaults.vel_ranges[2] || in->vel_ranges[3] != mDefaults.vel_ranges[3] ||
        //      in->vel_ranges[4] != mDefaults.vel_ranges[4] || in->vel_ranges[5] != mDefaults.vel_ranges[5])
        //{
//              mData[0] |= PART_SYS_VEL_RANGES_MASK;
        //}


        if(in->diffEqAlpha[0] != mDefaults.diffEqAlpha[0] || 
                in->diffEqAlpha[1] != mDefaults.diffEqAlpha[1] ||
                in->diffEqAlpha[2] != mDefaults.diffEqAlpha[2] ||
                in->diffEqScale[0] != mDefaults.diffEqScale[0] || 
                in->diffEqScale[1] != mDefaults.diffEqScale[1] ||
                in->diffEqScale[2] != mDefaults.diffEqScale[2])
        {
                mData[0] |= PART_SYS_ALPHA_SCALE_DIFF_MASK;
        }


        if(in->scale_range[0] != mDefaults.scale_range[0] || 
                in->scale_range[1] != mDefaults.scale_range[1] ||
                in->scale_range[2] != mDefaults.scale_range[2] ||
                in->scale_range[3] != mDefaults.scale_range[3])
        {
                mData[0] |= PART_SYS_SCALE_RANGE_MASK;
        }

        
        if(in->alpha_range[0] != mDefaults.alpha_range[0] || 
                in->alpha_range[1] != mDefaults.alpha_range[1] ||
                in->alpha_range[2] != mDefaults.alpha_range[2] ||
                in->alpha_range[3] != mDefaults.alpha_range[3])
        {
                mData[2] |= PART_SYS_BYTE_3_ALPHA_MASK;
        }

        if(in->vel_offset[0] != mDefaults.vel_offset[0] || 
                in->vel_offset[1] != mDefaults.vel_offset[1] ||
                in->vel_offset[2] != mDefaults.vel_offset[2])
        {
                mData[0] |= PART_SYS_VEL_OFFSET_MASK;
        }


        if(in->mImageUuid != mDefaults.mImageUuid)
        {
                mData[0] |= PART_SYS_M_IMAGE_UUID_MASK;
        }

        for( i = 0; i < 8; i++)
        {
                if(in->mFlags[i])
                {
                        mData[1] |= 1<<i;
//                      llprintline("Flag \"%x\" gets byte \"%x\"\n", i<<i, in->mFlags[i]);
                }
        }


        if(in->spawnRange != mDefaults.spawnRange ||
                in->spawnFrequency != mDefaults.spawnFrequency ||
                in->spawnFreqencyRange != mDefaults.spawnFreqencyRange ||
                in->spawnDirection[0] != mDefaults.spawnDirection[0] || 
                in->spawnDirection[1] != mDefaults.spawnDirection[1] ||
                in->spawnDirection[2] != mDefaults.spawnDirection[2] ||
                in->spawnDirectionRange != mDefaults.spawnDirectionRange ||
                in->spawnVelocity != mDefaults.spawnVelocity ||
                in->spawnVelocityRange != mDefaults.spawnVelocityRange)
        {
                mData[3] |= PART_SYS_BYTE_SPAWN_MASK;
        }


        if(in->windWeight != mDefaults.windWeight ||
                in->currentGravity[0] != mDefaults.currentGravity[0] || 
                in->currentGravity[1] != mDefaults.currentGravity[1] ||
                in->currentGravity[2] != mDefaults.currentGravity[2] ||
                in->gravityWeight != mDefaults.gravityWeight)
        {
                mData[3] |= PART_SYS_BYTE_ENVIRONMENT_MASK;
        }

        
        if(in->globalLifetime != mDefaults.globalLifetime ||
                in->individualLifetime != mDefaults.individualLifetime ||
                in->individualLifetimeRange != mDefaults.individualLifetimeRange)
        {
                mData[3] |= PART_SYS_BYTE_LIFESPAN_MASK;
        }

        
        if(in->speedLimit != mDefaults.speedLimit ||
                in->alphaDecay != mDefaults.alphaDecay ||
                in->scaleDecay != mDefaults.scaleDecay ||
                in->dampMotionFactor != mDefaults.dampMotionFactor)
        {
                mData[3] |= PART_SYS_BYTE_DECAY_DAMP_MASK;
        }

        if(in->windDiffusionFactor[0] != mDefaults.windDiffusionFactor[0] || 
                in->windDiffusionFactor[1] != mDefaults.windDiffusionFactor[1] ||
                in->windDiffusionFactor[2] != mDefaults.windDiffusionFactor[2])
        {
                mData[3] |= PART_SYS_BYTE_WIND_DIFF_MASK;
        }
}

F32 floatFromTwoBytes(S8 bMant, S8 bExp)
{
        F32 result = bMant;
        while(bExp > 0) 
        {
                result *= 2.0f;
                bExp--;
        }
        while(bExp < 0) 
        {
                result *= 0.5f;
                bExp++;
        }
        return result;
}

void twoBytesFromFloat(F32 fIn, S8 &bMant, S8 &bExp)
{
        bExp = 0;
        if(fIn > 127.0f)
        {
                fIn = 127.0f;
        }
        if(fIn < -127.0f)
        {
                fIn = -127.0f;
        }
        while(fIn < 64 && fIn > -64 && bExp > -127) 
        {
                fIn *= 2.0f;
                bExp--;
        }
        while((fIn > 128 || fIn < -128) && bExp < 127)
        {
                fIn *= 0.5f;
                bExp++;
        }
        bMant = (S8)fIn;
}

        

/*
U32 LLPartSysCompressedPacket::writeK(LLPartInitData *in, U32 startByte)
{
        U32 i, kFlag, i_mod_eight;
        S8 bMant, bExp;

        kFlag = startByte;

        startByte += 3; // 3 bytes contain enough room for 18 flag bits
        mData[kFlag] = 0x00;
//      llprintline("In the writeK\n");

        i_mod_eight = 0;
        for(i = 0; i < 18; i++) 
        {
                if(in->k[i] != mDefaults.k[i]) 
                {

                        mData[kFlag] |= 1<<i_mod_eight;
                        twoBytesFromFloat(in->k[i], bMant, bExp);

                        mData[startByte++] = bMant;
                        mData[startByte++] = bExp;
                }
                i_mod_eight++;
                while(i_mod_eight >= 8) 
                {
                        kFlag++;
                        i_mod_eight -= 8;
                }
        }
        
        return startByte;
}*/

U32 LLPartSysCompressedPacket::writeKill_p(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;

        twoBytesFromFloat(in->killPlaneNormal[0], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->killPlaneNormal[1], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->killPlaneNormal[2], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        
        twoBytesFromFloat(in->killPlaneZ, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->distanceDeath, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        return startByte;
}

U32 LLPartSysCompressedPacket::writeBounce_p(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;

        twoBytesFromFloat(in->bouncePlaneNormal[0], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->bouncePlaneNormal[1], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->bouncePlaneNormal[2], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        

        twoBytesFromFloat(in->bouncePlaneZ, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        return startByte;
}

U32 LLPartSysCompressedPacket::writeBounce_b(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;
        twoBytesFromFloat(in->bounce_b, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        return startByte;
}

//U32 LLPartSysCompressedPacket::writePos_ranges(LLPartInitData *in, U32 startByte)
//{
//      S8 tmp;
//      int i;
//      for(i = 0; i < 6; i++)
//      {
//              tmp = (S8) in->pos_ranges[i]; // float to int conversion (keep the sign)
//              mData[startByte++] = (U8)tmp; // signed to unsigned typecast
//      }
//      return startByte;
//}

//U32 LLPartSysCompressedPacket::writeVel_ranges(LLPartInitData *in, U32 startByte)
//{
//      S8 tmp;
//      int i;
//      for(i = 0; i < 6; i++)
//      {
//              tmp = (S8) in->vel_ranges[i]; // float to int conversion (keep the sign)
//              mData[startByte++] = (U8)tmp; // signed to unsigned typecast
//      }
//      return startByte;
//}

U32 LLPartSysCompressedPacket::writeAlphaScaleDiffEqn_range(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;
        int i;
        for(i = 0; i < 3; i++)
        {
                twoBytesFromFloat(in->diffEqAlpha[i], bMant, bExp);
                mData[startByte++] = bMant;
                mData[startByte++] = bExp;
        }
        for(i = 0; i < 3; i++)
        {
                twoBytesFromFloat(in->diffEqScale[i], bMant, bExp);
                mData[startByte++] = bMant;
                mData[startByte++] = bExp;
        }
        return startByte;
}

U32 LLPartSysCompressedPacket::writeScale_range(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;
        int i;
        for(i = 0; i < 4; i++)
        {
                twoBytesFromFloat(in->scale_range[i], bMant, bExp);
                mData[startByte++] = bMant;
                mData[startByte++] = bExp;
        }
        return startByte;
}


U32 LLPartSysCompressedPacket::writeAlpha_range(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;
        int i;
        for(i = 0; i < 4; i++)
        {
                twoBytesFromFloat(in->alpha_range[i], bMant, bExp);
                mData[startByte++] = bMant;
                mData[startByte++] = bExp;
        }
        return startByte;
}

U32 LLPartSysCompressedPacket::writeVelocityOffset(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;
        int i;
        for(i = 0; i < 3; i++)
        {
                twoBytesFromFloat(in->vel_offset[i], bMant, bExp);
                mData[startByte++] = bMant;
                mData[startByte++] = bExp;
        }
        return startByte;
}

U32 LLPartSysCompressedPacket::writeUUID(LLPartInitData *in, U32 startByte)
{
        U8 * bufPtr = mData + startByte;
        if(in->mImageUuid == IMG_SHOT) {
                mData[startByte++] = 0x01;
                return startByte;
        }

        if(in->mImageUuid == IMG_SPARK) {
                mData[startByte++] = 0x02;
                return startByte;
        }

        
        if(in->mImageUuid == IMG_BIG_EXPLOSION_1) {
                mData[startByte++] = 0x03;
                return startByte;
        }

        if(in->mImageUuid == IMG_BIG_EXPLOSION_2) {
                mData[startByte++] = 0x04;
                return startByte;
        }


        if(in->mImageUuid == IMG_SMOKE_POOF) {
                mData[startByte++] = 0x05;
                return startByte;
        }

        if(in->mImageUuid == IMG_FIRE) {
                mData[startByte++] = 0x06;
                return startByte;
        }

        
        if(in->mImageUuid == IMG_EXPLOSION) {
                mData[startByte++] = 0x07;
                return startByte;
        }

        if(in->mImageUuid == IMG_EXPLOSION_2) {
                mData[startByte++] = 0x08;
                return startByte;
        }

        
        if(in->mImageUuid == IMG_EXPLOSION_3) {
                mData[startByte++] = 0x09;
                return startByte;
        }

        if(in->mImageUuid == IMG_EXPLOSION_4) {
                mData[startByte++] = 0x0A;
                return startByte;
        }

        mData[startByte++] = 0x00; // flag for "read whole UUID"

        memcpy(bufPtr, in->mImageUuid.mData, 16);               /* Flawfinder: ignore */
        return (startByte+16);
}

U32 LLPartSysCompressedPacket::writeSpawn(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;
        int i;

        twoBytesFromFloat(in->spawnRange, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->spawnFrequency, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->spawnFreqencyRange, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        
        
        for(i = 0; i < 3; i++)
        {
                twoBytesFromFloat(in->spawnDirection[i], bMant, bExp);
                mData[startByte++] = bMant;
                mData[startByte++] = bExp;
        }

        twoBytesFromFloat(in->spawnDirectionRange, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->spawnVelocity, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        twoBytesFromFloat(in->spawnVelocityRange, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        return startByte;
}

U32 LLPartSysCompressedPacket::writeEnvironment(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;
        int i;

        twoBytesFromFloat(in->windWeight, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        for(i = 0; i < 3; i++)
        {
                twoBytesFromFloat(in->currentGravity[i], bMant, bExp);
                mData[startByte++] = bMant;
                mData[startByte++] = bExp;
        }

        twoBytesFromFloat(in->gravityWeight, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;
        return startByte;
}       
        
U32 LLPartSysCompressedPacket::writeLifespan(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;

        twoBytesFromFloat(in->globalLifetime, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        twoBytesFromFloat(in->individualLifetime, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        twoBytesFromFloat(in->individualLifetimeRange, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        return startByte;
}
        

U32 LLPartSysCompressedPacket::writeDecayDamp(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;

        twoBytesFromFloat(in->speedLimit, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        twoBytesFromFloat(in->alphaDecay, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        twoBytesFromFloat(in->scaleDecay, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        twoBytesFromFloat(in->dampMotionFactor, bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        return startByte;
}

U32 LLPartSysCompressedPacket::writeWindDiffusionFactor(LLPartInitData *in, U32 startByte)
{
        S8 bExp, bMant;

        twoBytesFromFloat(in->windDiffusionFactor[0], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        twoBytesFromFloat(in->windDiffusionFactor[1], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        twoBytesFromFloat(in->windDiffusionFactor[2], bMant, bExp);
        mData[startByte++] = bMant;
        mData[startByte++] = bExp;

        return startByte;
}





        
/*
U32 LLPartSysCompressedPacket::readK(LLPartInitData *in, U32 startByte)
{
        U32 i, i_mod_eight, kFlag;
        S8 bMant, bExp; // 1 bytes mantissa and exponent for a float
        kFlag = startByte;
        startByte += 3; // 3 bytes has enough room for 18 bits

        i_mod_eight = 0;
        for(i = 0; i < 18; i++) 
        {
                if(mData[kFlag]&(1<<i_mod_eight))  
                {

                        
                
                        bMant = mData[startByte++];
                        bExp = mData[startByte++];
                
                        
                        in->k[i] = floatFromTwoBytes(bMant, bExp); // much tighter platform-independent
                        //                                            way to ship floats

                }
                i_mod_eight++;
                if(i_mod_eight >= 8)
                {
                        i_mod_eight -= 8;
                        kFlag++;
                }
        }
        
        return startByte;
}
*/

U32 LLPartSysCompressedPacket::readKill_p(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->killPlaneNormal[0] = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->killPlaneNormal[1] = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->killPlaneNormal[2] = floatFromTwoBytes(bMant, bExp);

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->killPlaneZ = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->distanceDeath = floatFromTwoBytes(bMant, bExp);

        return startByte;
}

U32 LLPartSysCompressedPacket::readBounce_p(LLPartInitData *in, U32 startByte)
{

        S8 bMant, bExp;

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->bouncePlaneNormal[0] = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->bouncePlaneNormal[1] = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->bouncePlaneNormal[2] = floatFromTwoBytes(bMant, bExp);

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->bouncePlaneZ = floatFromTwoBytes(bMant, bExp);

        return startByte;
}

U32 LLPartSysCompressedPacket::readBounce_b(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->bounce_b = floatFromTwoBytes(bMant, bExp);
        return startByte;
}


//U32 LLPartSysCompressedPacket::readPos_ranges(LLPartInitData *in, U32 startByte)
//{
//      S8 tmp;
//      int i;
//      for(i = 0; i < 6; i++)
//      {
//              tmp = (S8)mData[startByte++];
//              in->pos_ranges[i] = tmp;
//      }
//      return startByte;
//}

//U32 LLPartSysCompressedPacket::readVel_ranges(LLPartInitData *in, U32 startByte)
//{
//      S8 tmp;
//      int i;
//      for(i = 0; i < 6; i++)
//      {
//              tmp = (S8)mData[startByte++];
//              in->vel_ranges[i] = tmp;
//      }
//      return startByte;
//}



U32 LLPartSysCompressedPacket::readAlphaScaleDiffEqn_range(LLPartInitData *in, U32 startByte)
{
        int i;
        S8 bMant, bExp;
        for(i = 0; i < 3; i++)
        {
                bMant = mData[startByte++];
                bExp = mData[startByte++];
                in->diffEqAlpha[i] = floatFromTwoBytes(bMant, bExp);
        }
        for(i = 0; i < 3; i++)
        {
                bMant = mData[startByte++];
                bExp = mData[startByte++];
                in->diffEqScale[i] = floatFromTwoBytes(bMant, bExp);
        }
        return startByte;
}

U32 LLPartSysCompressedPacket::readAlpha_range(LLPartInitData *in, U32 startByte)
{
        int i;
        S8 bMant, bExp;
        for(i = 0; i < 4; i++)
        {
                bMant = mData[startByte++];
                bExp = mData[startByte++];
                in->alpha_range[i] = floatFromTwoBytes(bMant, bExp);
        }
        return startByte;
}

U32 LLPartSysCompressedPacket::readScale_range(LLPartInitData *in, U32 startByte)
{
        int i;
        S8 bMant, bExp;
        for(i = 0; i < 4; i++)
        {
                bMant = mData[startByte++];
                bExp = mData[startByte++];
                in->scale_range[i] = floatFromTwoBytes(bMant, bExp);
        }
        return startByte;
}

U32 LLPartSysCompressedPacket::readVelocityOffset(LLPartInitData *in, U32 startByte)
{
        int i;
        S8 bMant, bExp;
        for(i = 0; i < 3; i++)
        {
                bMant = mData[startByte++];
                bExp = mData[startByte++];
                in->vel_offset[i] = floatFromTwoBytes(bMant, bExp);
        }
        return startByte;
}

U32 LLPartSysCompressedPacket::readUUID(LLPartInitData *in, U32 startByte)
{
        U8 * bufPtr = mData + startByte;
        
        if(mData[startByte] == 0x01)
        {
                in->mImageUuid = IMG_SHOT;
                return startByte+1;
        }
        if(mData[startByte] == 0x02)
        {
                in->mImageUuid = IMG_SPARK;
                return startByte+1;
        }
        if(mData[startByte] == 0x03)
        {
                in->mImageUuid = IMG_BIG_EXPLOSION_1;
                return startByte+1;
        }
        if(mData[startByte] == 0x04)
        {
                in->mImageUuid = IMG_BIG_EXPLOSION_2;
                return startByte+1;
        }
        if(mData[startByte] == 0x05)
        {
                in->mImageUuid = IMG_SMOKE_POOF;
                return startByte+1;
        }
        if(mData[startByte] == 0x06)
        {
                in->mImageUuid = IMG_FIRE;
                return startByte+1;
        }
        if(mData[startByte] == 0x07)
        {
                in->mImageUuid = IMG_EXPLOSION;
                return startByte+1;
        }
        if(mData[startByte] == 0x08)
        {
                in->mImageUuid = IMG_EXPLOSION_2;
                return startByte+1;
        }
        if(mData[startByte] == 0x09)
        {
                in->mImageUuid = IMG_EXPLOSION_3;
                return startByte+1;
        }
        if(mData[startByte] == 0x0A)
        {
                in->mImageUuid = IMG_EXPLOSION_4;
                return startByte+1;
        }

        startByte++; // cause we actually have to read the UUID now.
        memcpy(in->mImageUuid.mData, bufPtr, 16);               /* Flawfinder: ignore */
        return (startByte+16);
}




U32 LLPartSysCompressedPacket::readSpawn(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;
        U32     i;

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->spawnRange = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->spawnFrequency = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->spawnFreqencyRange = floatFromTwoBytes(bMant, bExp);

        for(i = 0; i < 3; i++)
        {
                bMant = mData[startByte++];
                bExp = mData[startByte++];
                in->spawnDirection[i] = floatFromTwoBytes(bMant, bExp);
        }

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->spawnDirectionRange = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->spawnVelocity = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->spawnVelocityRange = floatFromTwoBytes(bMant, bExp);

        return startByte;
}

U32 LLPartSysCompressedPacket::readEnvironment(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;
        U32     i;


        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->windWeight = floatFromTwoBytes(bMant, bExp);

        for(i = 0; i < 3; i++)
        {
                bMant = mData[startByte++];
                bExp = mData[startByte++];
                in->currentGravity[i] = floatFromTwoBytes(bMant, bExp);
        }

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->gravityWeight = floatFromTwoBytes(bMant, bExp);

        return startByte;
}

U32 LLPartSysCompressedPacket::readLifespan(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->globalLifetime = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->individualLifetime = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->individualLifetimeRange = floatFromTwoBytes(bMant, bExp);

        return startByte;
}

U32 LLPartSysCompressedPacket::readDecayDamp(LLPartInitData *in, U32 startByte)
{
        S8 bMant, bExp;

        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->speedLimit = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->alphaDecay = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->scaleDecay = floatFromTwoBytes(bMant, bExp);
        bMant = mData[startByte++];
        bExp = mData[startByte++];
        in->dampMotionFactor = floatFromTwoBytes(bMant, bExp);

        return startByte;
}

U32 LLPartSysCompressedPacket::readWindDiffusionFactor(LLPartInitData *in, U32 startByte)
{
        int i;
        S8 bMant, bExp;
        for(i = 0; i < 3; i++)
        {
                bMant = mData[startByte++];
                bExp = mData[startByte++];
                in->windDiffusionFactor[i] = floatFromTwoBytes(bMant, bExp);
        }
        return startByte;
}

BOOL LLPartSysCompressedPacket::fromLLPartInitData(LLPartInitData *in, U32 &bytesUsed)
{

        writeFlagByte(in);
        U32 currByte = 4;
        
//      llprintline("calling \"fromLLPartInitData\"\n");

        //if(mData[0] & PART_SYS_K_MASK)
        //{
        //      currByte = writeK(in, 3); // first 3 bytes are reserved for header data
        //}
        


        if(mData[0] & PART_SYS_KILL_P_MASK)
        {
                currByte = writeKill_p(in, currByte);
        }
        
        if(mData[0] & PART_SYS_BOUNCE_P_MASK)
        {
                currByte = writeBounce_p(in, currByte);
        }
        
        if(mData[0] & PART_SYS_BOUNCE_B_MASK)
        {
                currByte = writeBounce_b(in, currByte);
        }
        
        //if(mData[0] & PART_SYS_POS_RANGES_MASK)
        //{
        //      currByte = writePos_ranges(in, currByte);
        //}
        
        //if(mData[0] & PART_SYS_VEL_RANGES_MASK)
        //{
        //      currByte = writeVel_ranges(in, currByte);
        //}

        if(mData[0] & PART_SYS_ALPHA_SCALE_DIFF_MASK)
        {
                currByte = writeAlphaScaleDiffEqn_range(in, currByte);
        }
        
        if(mData[0] & PART_SYS_SCALE_RANGE_MASK)
        {
                currByte = writeScale_range(in, currByte);
        }
        
        if(mData[0] & PART_SYS_VEL_OFFSET_MASK)
        {
                currByte = writeVelocityOffset(in, currByte);
        }

        if(mData[0] & PART_SYS_M_IMAGE_UUID_MASK)
        {
                currByte = writeUUID(in, currByte);
        }
        

        if(mData[3] & PART_SYS_BYTE_SPAWN_MASK)
        {
                currByte = writeSpawn(in, currByte);
        }
        
        if(mData[3] & PART_SYS_BYTE_ENVIRONMENT_MASK)
        {
                currByte = writeEnvironment(in, currByte);
        }
        
        if(mData[3] & PART_SYS_BYTE_LIFESPAN_MASK)
        {
                currByte = writeLifespan(in, currByte);
        }
        
        if(mData[3] & PART_SYS_BYTE_DECAY_DAMP_MASK)
        {
                currByte = writeDecayDamp(in, currByte);
        }
        
        if(mData[3] & PART_SYS_BYTE_WIND_DIFF_MASK)
        {
                currByte = writeWindDiffusionFactor(in, currByte);
        }
        

        if(mData[2] & PART_SYS_BYTE_3_ALPHA_MASK)
        {
                currByte = writeAlpha_range(in, currByte);
        }

        mData[currByte++] = (U8)in->maxParticles;
        mData[currByte++] = (U8)in->initialParticles;


        U32 flagFlag = 1; // flag indicating which flag bytes are non-zero
        //                   yeah, I know, the name sounds funny
        for(U32 i = 0; i < 8; i++)
        {
        
//              llprintline("Flag \"%x\" gets byte \"%x\"\n", flagFlag, in->mFlags[i]);
                if(mData[1] & flagFlag)
                {
                        mData[currByte++] = in->mFlags[i];
//                      llprintline("and is valid...\n");
                }
                flagFlag <<= 1;
        }

        bytesUsed = mNumBytes = currByte;
        
        
        
//      llprintline("returning from \"fromLLPartInitData\" with %d bytes\n", bytesUsed);
        
        return TRUE;
}

BOOL LLPartSysCompressedPacket::toLLPartInitData(LLPartInitData *out, U32 *bytesUsed)
{
        U32 currByte = 4;

        gSetInitDataDefaults(out);

        if(mData[0] & PART_SYS_KILL_P_MASK)
        {
                currByte = readKill_p(out, currByte);
        }
        
        if(mData[0] & PART_SYS_BOUNCE_P_MASK)
        {
                currByte = readBounce_p(out, currByte);
        }
        
        if(mData[0] & PART_SYS_BOUNCE_B_MASK)
        {
                currByte = readBounce_b(out, currByte);
        }
        
        if(mData[0] & PART_SYS_ALPHA_SCALE_DIFF_MASK)
        {
                currByte = readAlphaScaleDiffEqn_range(out, currByte);
        }
        
        if(mData[0] & PART_SYS_SCALE_RANGE_MASK)
        {
                currByte = readScale_range(out, currByte);
        }
        
        if(mData[0] & PART_SYS_VEL_OFFSET_MASK)
        {
                currByte = readVelocityOffset(out, currByte);
        }
        
        if(mData[0] & PART_SYS_M_IMAGE_UUID_MASK)
        {
                currByte = readUUID(out, currByte);
        }
        

        if(mData[3] & PART_SYS_BYTE_SPAWN_MASK)
        {
                currByte = readSpawn(out, currByte);
        }
        
        if(mData[3] & PART_SYS_BYTE_ENVIRONMENT_MASK)
        {
                currByte = readEnvironment(out, currByte);
        }
        
        if(mData[3] & PART_SYS_BYTE_LIFESPAN_MASK)
        {
                currByte = readLifespan(out, currByte);
        }
        
        if(mData[3] & PART_SYS_BYTE_DECAY_DAMP_MASK)
        {
                currByte = readDecayDamp(out, currByte);
        }
        
        if(mData[3] & PART_SYS_BYTE_WIND_DIFF_MASK)
        {
                currByte = readWindDiffusionFactor(out, currByte);
        }
        
        if(mData[2] & PART_SYS_BYTE_3_ALPHA_MASK)
        {
                currByte = readAlpha_range(out, currByte);
        }

        out->maxParticles = mData[currByte++];
        out->initialParticles = mData[currByte++];

        U32 flagFlag = 1; // flag indicating which flag bytes are non-zero
        //                   yeah, I know, the name sounds funny
        for(U32 i = 0; i < 8; i++)
        {
                flagFlag = 1<<i;
        
                if((mData[1] & flagFlag))
                {
                        out->mFlags[i] = mData[currByte++];
                }
        }

        *bytesUsed = currByte;
        return TRUE;
}

BOOL LLPartSysCompressedPacket::fromUnsignedBytes(U8 *in, U32 bytesUsed)
{
        if ((in != NULL) && (bytesUsed <= sizeof(mData)))
        {
                memcpy(mData, in, bytesUsed);   /* Flawfinder: ignore */
                mNumBytes = bytesUsed;
                return TRUE;
        }
        else
        {
                llerrs << "NULL input data or number of bytes exceed mData size" << llendl;
                return FALSE;
        }
}               
        

U32 LLPartSysCompressedPacket::bufferSize()
{
        return mNumBytes;
}

BOOL LLPartSysCompressedPacket::toUnsignedBytes(U8 *out)
{
        memcpy(out, mData, mNumBytes);          /* Flawfinder: ignore */
        return TRUE;
}

U8 * LLPartSysCompressedPacket::getBytePtr()
{
        return mData;
}

---