fixed moments calculcation

[swftools.git] / lib / rfxswf.c

/* vi: set sts=2 sw=2 :*/
/* rfxswf.c 

   Library for creating and reading SWF files or parts of it.
   There's a module directory which provides some extended functionality.
   Most modules are included at the bottom of this file.

   Part of the swftools package.

   Copyright (c) 2000-2003 Rainer Böhme <rfxswf@reflex-studio.de>
   Copyright (c) 2003 Matthias Kramm <kramm@quiss.org> 

   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 */

#include "mem.h"
#include "rfxswf.h"
#ifdef HAVE_ZLIB
#include <zlib.h>
#endif // HAVE_ZLIB

#ifndef RFXSWF_DISABLESOUND
#ifdef HAVE_LAME
#include "lame/lame.h"
#endif
#endif

#ifdef HAVE_TIME_H
#include <time.h>
#endif

#ifdef HAVE_IO_H
#include <io.h>
#endif

#include "./bitio.h"
#include "./os.h"

// internal constants

#define MALLOC_SIZE     128
#define INSERT_RFX_TAG

#define MEMSIZE(l) (((l/MALLOC_SIZE)+1)*MALLOC_SIZE)

// inline wrapper functions

TAG * swf_NextTag(TAG * t) { return t->next; }
TAG * swf_PrevTag(TAG * t) { return t->prev; }
U16   swf_GetTagID(TAG * t)    { return t->id; }
U32   swf_GetTagLen(TAG * t) { return t->len; }
U8*   swf_GetTagLenPtr(TAG * t) { return &(t->data[t->len]); }
U32   swf_GetTagPos(TAG * t)   { return t->pos; }

void swf_SetTagPos(TAG * t,U32 pos)
{ swf_ResetReadBits(t);
  if (pos<=t->len) t->pos = pos;
  else { 
#ifdef DEBUG_RFXSWF
    fprintf(stderr,"SetTagPos(%d) out of bounds: TagID = %i\n",pos, t->id);
#endif
  }
}

char* swf_GetString(TAG*t)
{
    int pos = t->pos;
    while(t->pos < t->len && swf_GetU8(t));
    /* make sure we always have a trailing zero byte */
    if(t->pos == t->len) {
      if(t->len == t->memsize) {
        swf_ResetWriteBits(t);
        swf_SetU8(t, 0);
        t->len = t->pos;
      }
      t->data[t->len] = 0;
    }
    return (char*)&(t->data[pos]);
}

U8 swf_GetU8(TAG * t)
{ swf_ResetReadBits(t);
  #ifdef DEBUG_RFXSWF
    if ((int)t->pos>=(int)t->len) 
    { fprintf(stderr,"GetU8() out of bounds: TagID = %i\n",t->id);
      *(int*)0=0;
      return 0;
    }
  #endif
  return t->data[t->pos++];
}

U16 swf_GetU16(TAG * t)
{ U16 res;
  swf_ResetReadBits(t);
  #ifdef DEBUG_RFXSWF
    if ((int)t->pos>((int)t->len-2)) 
    { fprintf(stderr,"GetU16() out of bounds: TagID = %i\n",t->id);
      return 0;
    }
  #endif
  res = t->data[t->pos] | (t->data[t->pos+1]<<8);
  t->pos+=2;
  return res;
}

U32 swf_GetU32(TAG * t)
{ U32 res;
  swf_ResetReadBits(t);
  #ifdef DEBUG_RFXSWF
    if ((int)t->pos>((int)t->len-4)) 
    { fprintf(stderr,"GetU32() out of bounds: TagID = %i\n",t->id);
      return 0;
    }
  #endif
  res = t->data[t->pos]        | (t->data[t->pos+1]<<8) | 
       (t->data[t->pos+2]<<16) | (t->data[t->pos+3]<<24);
  t->pos+=4;
  return res;
}

int swf_GetBlock(TAG * t,U8 * b,int l)
// returns number of bytes written (<=l)
// b = NULL -> skip data
{ swf_ResetReadBits(t);
  if ((t->len-t->pos)<l) l=t->len-t->pos;
  if (b && l) memcpy(b,&t->data[t->pos],l);
  t->pos+=l;
  return l;
}

int swf_SetBlock(TAG * t,const U8 * b,int l)
// Appends Block to the end of Tagdata, returns size
{ U32 newlen = t->len + l;
  swf_ResetWriteBits(t);
  if (newlen>t->memsize)
  { U32  newmem  = MEMSIZE(newlen);  
    U8 * newdata = (U8*)(rfx_realloc(t->data,newmem));
    t->memsize = newmem;
    t->data    = newdata;
  }
  if (b) memcpy(&t->data[t->len],b,l);
  else memset(&t->data[t->len],0x00,l);
  t->len+=l;
  return l;
}

int swf_SetU8(TAG * t,U8 v)
{ swf_ResetWriteBits(t);
  if ((t->len+1)>t->memsize) return (swf_SetBlock(t,&v,1)==1)?0:-1;
  t->data[t->len++] = v;
  return 0;
}

int swf_SetU16(TAG * t,U16 v)
{ U8 a[2];
  a[0] = v&0xff;
  a[1] = v>>8;
  
  swf_ResetWriteBits(t);
  if ((t->len+2)>t->memsize) return (swf_SetBlock(t,a,2)==2)?0:-1;
  t->data[t->len++] = a[0];
  t->data[t->len++] = a[1];
  return 0;
}
void swf_SetS16(TAG * t,int v)
{
    if(v>32767 || v<-32768) {
      #ifdef DEBUG_RFXSWF
        fprintf(stderr, "Warning: S16 overflow: %d\n", v);
      #endif
    }
    swf_SetU16(t, (S16)v);
}

int swf_SetU32(TAG * t,U32 v)
{ U8 a[4];
  a[0] = v&0xff;        // to ensure correct handling of non-intel byteorder
  a[1] = (v>>8)&0xff;
  a[2] = (v>>16)&0xff;
  a[3] = (v>>24)&0xff;
  
  swf_ResetWriteBits(t);
  if ((t->len+4)>t->memsize) return (swf_SetBlock(t,a,4)==4)?0:-1;
  t->data[t->len++] = a[0];
  t->data[t->len++] = a[1];
  t->data[t->len++] = a[2];
  t->data[t->len++] = a[3];
  return 0;
}

U32 swf_GetBits(TAG * t,int nbits)
{ U32 res = 0;
  if (!nbits) return 0;
  if (!t->readBit) t->readBit = 0x80;
  while (nbits)
  { res<<=1;
#ifdef DEBUG_RFXSWF
    if (t->pos>=t->len) 
    { fprintf(stderr,"GetBits() out of bounds: TagID = %i, pos=%d, len=%d\n",t->id, t->pos, t->len);
      int i,m=t->len>10?10:t->len;
      for(i=-1;i<m;i++) {
        fprintf(stderr, "(%d)%02x ", i, t->data[i]);
      } 
      fprintf(stderr, "\n");
      return res;
    }
#endif
    if (t->data[t->pos]&t->readBit) res|=1;
    t->readBit>>=1;
    nbits--;
    if (!t->readBit)
    { if (nbits) t->readBit = 0x80;
      t->pos++;
    }
  }
  return res;
}

S32 swf_GetSBits(TAG * t,int nbits)
{ U32 res = swf_GetBits(t,nbits);
  if (res&(1<<(nbits-1))) res|=(0xffffffff<<nbits);  
  return (S32)res;
}

U32 reader_GetBits(reader_t*reader, int nbits)
{ return reader_readbits(reader, nbits);
}
S32 reader_GetSBits(reader_t*reader, int nbits)
{ U32 res = reader_readbits(reader, nbits);
  if (res&(1<<(nbits-1))) res|=(0xffffffff<<nbits);  
  return (S32)res;
}

int swf_SetBits(TAG * t,U32 v,int nbits)
{ U32 bm = 1<<(nbits-1);

  while (nbits)
  { if (!t->writeBit)
    { if (FAILED(swf_SetU8(t,0))) return -1;
      t->writeBit = 0x80;
    }
    if (v&bm) t->data[t->len-1] |= t->writeBit;
    bm>>=1;
    t->writeBit>>=1;
    nbits--;
  }
  return 0;
}

// Advanced Data Access Functions

double swf_GetFixed(TAG * t)
{
  U16 low =  swf_GetU16(t);
  U16 high = swf_GetU16(t);
  return high + low*(1/65536.0);
}
void swf_SetFixed(TAG * t, double f)
{
  U16 fr = (U16)((f-(int)f)*65536);
  swf_SetU16(t, fr);
  swf_SetU16(t, (U16)f - (f<0 && fr!=0));
}
float swf_GetFixed8(TAG * t)
{
  U8 low =  swf_GetU8(t);
  U8 high = swf_GetU8(t);
  return (float)(high + low*(1/256.0));
}
void swf_SetFixed8(TAG * t, float f)
{
  U8 fr = (U8)((f-(int)f)*256);
  swf_SetU8(t, fr);
  swf_SetU8(t, (U8)f - (f<0 && fr!=0));
}

U32 swf_GetU30(TAG*tag)
{
    U32 shift = 0;
    U32 s = 0;
    int nr=0;
    while(1) {
        U8 b = swf_GetU8(tag);
        nr++;
        s|=(b&127)<<shift;
        shift+=7;
        if(!(b&128) || shift>=32)
            break;
    }
    /*int nr2= swf_SetU30(0, s);
    if(nr!=nr2) {
      printf("Unsigned value %d stored in %d bytes, I'd store it in %d bytes\n", s, nr, nr2);
    }*/
    return s;
}

int swf_SetU30(TAG*tag, U32 u)
{
    int nr = 0;
    do {
        if(tag)
          swf_SetU8(tag, (u&~0x7f?0x80:0) | (u&0x7F));
        u>>=7;
        nr++;
    } while(u);
    return nr;
}

void swf_SetABCU32(TAG*tag, U32 u)
{
  do {
      swf_SetU8(tag, (u&~0x7f?0x80:0) | (u&0x7F));
      u>>=7;
  } while(u);
}
U32 swf_GetABCU32(TAG*tag)
{
  return swf_GetU30(tag);
}
void swf_SetABCS32(TAG*tag, S32 v)
{
  swf_SetABCU32(tag, v);
}
S32 swf_GetABCS32(TAG*tag)
{
  return swf_GetABCU32(tag);
}

#if 0

/*The AVM2 spec is just plain wrong, claiming that S32 values are sign
extended. They're not.
This wastes up to 4 bytes for every negative value. */

void swf_SetABCS32(TAG*tag, S32 s)
{
  printf("write S32: %d\n", s);
    S32 neg = s<0?-1:0;
    U8 sign = s<0?0x40:0;
    while(1) {
        U8 val = s&0x7f;
        U8 vsign = s&0x40;
        s>>=7;
        neg>>=7;
        if(s==neg && vsign==sign) {
            /* if the value we now write has the same sign as s
               and all the remaining bits are equal to the sign of s
               too, stop writing */
            swf_SetU8(tag, val);
            printf("put %02x\n", val);
            break;
        } else {
            swf_SetU8(tag, 0x80 | val);
            printf("put %02x\n", 0x80|val);
        }
    };
}
int swf_GetS30(TAG*tag)
{
    U32 shift = 0;
    U32 s = 0;
    int nr=0;
    while(1) {
        U8 b = swf_GetU8(tag);
        nr++;
        nt i,m=t->len>10?10:t->len;
                for(i=0;i<m;i++) {
                            fprintf(stderr, "%02x ", t->data[i]);
                                    } 
                        fprintf(stderr, "\n");
                        s|=(b&127)<<shift;
        shift+=7;
        if(!(b&128) || shift>=32) {
            if(b&64) {
                if(shift<32) 
                  s|=0xffffffff<<shift;
            }
            break;
        }
    }
    /* It's not uncommon for other applications (Flex for all negative numbers, and
       Flash for -1) to generate a lot more bytes than would be necessary.
       int nr2= swf_SetS30(0, s);
    if(nr!=nr2) {
      printf("Signed value %d stored in %d bytes, I'd store it in %d bytes\n", s, nr, nr2);
    }*/
    return s;
}
#endif

int swf_SetU30String(TAG*tag, const char*str, int l)
{
    int len=0;
    len+=swf_SetU30(tag, l);
    len+=l;
    swf_SetBlock(tag, (void*)str, l);
    return len;
}

float swf_GetF16(TAG * t)
{
    U16 f1 = swf_GetU16(t);
    if(!(f1&0x3ff)) return 0.0;

    // IEEE 16 is 1-5-10
    // IEEE 32 is 1-8-23
    /* gcc 4.1.2 seems to require a union here. *(float*)u doesn't work */
    union {
      U32 u;
      float f;
    } f2;

    U16 e = (f1>>10)&0x1f;
    U16 m = f1&0x3ff;
    /* find highest bit in mantissa */
    int h=0;
    while(!(m&0x400)) {
        m<<=1;
        h++;
    }
    m&=0x3ff;
    e -= h;
    e += 0x6f;

    f2.u = (f1&0x8000)<<16; //sign
    f2.u |= e<<23; //exponent
    f2.u |= m<<13; //mantissa
    return *(float*)&f2;
}

void swf_SetF16(TAG * t, float f)
{
    union {
      U32 u;
      float f;
    } v;
    v.f = f;

    U16 result = (v.u>>16)&0x8000; //sign
    int exp = ((v.u>>23)&0xff)-0x7f+0x10;
    U16 m = (v.u>>13)&0x3ff;
    //fprintf(stderr, "%f: %04x sign, %d exp, %04x mantissa\n", f, result, exp, m);
    if(exp<-10) {
        // underflow (clamp to 0.0)
        exp = 0;
        m = 0;
    } else if(exp<0) {
        // partial underflow- strip some bits
        m = (m|0x400)>>-exp;
        exp = 0;
    } else if(exp>=32) {
        exp = 31;
        m = 0x3ff;
        fprintf(stderr, "Exponent overflow in FLOAT16 encoding\n");
    } else {
        exp++;
        m = (m>>1)|0x200;
    }
    result |= exp<<10;
    result |= m;
    swf_SetU16(t, result);
}

float F16toFloat(U16 x)
{
    TAG t;
    t.data = (void*)&x;
    t.readBit = 0;
    t.pos = 0;
    t.len = 2;
    return swf_GetF16(&t);
}

float floatToF16(float f)
{
    U16 u = 0;
    TAG t;
    t.data = (void*)&u;
    t.len = 0;
    t.memsize = 2;
    t.writeBit = 0;
    swf_SetF16(&t, f);
    return u;
}

double swf_GetD64(TAG*tag)
{
    /* FIXME: this is not big-endian compatible */
    double value = *(double*)&tag->data[tag->pos];
    swf_GetU32(tag);
    swf_GetU32(tag);
    return value;
}
int swf_SetD64(TAG*tag, double v)
{
    /* FIXME: this is not big-endian compatible */
    swf_SetU32(tag, ((U32*)&v)[0]);
    swf_SetU32(tag, ((U32*)&v)[1]);
    return 8;
}
int swf_GetU24(TAG*tag)
{
    int b1 = swf_GetU8(tag);
    int b2 = swf_GetU8(tag);
    int b3 = swf_GetU8(tag);
    return b3<<16|b2<<8|b1;
}
int swf_GetS24(TAG*tag)
{
    int b1 = swf_GetU8(tag);
    int b2 = swf_GetU8(tag);
    int b3 = swf_GetU8(tag);
    if(b3&0x80) {
        return -1-((b3<<16|b2<<8|b1)^0xffffff);
    } else {
        return b3<<16|b2<<8|b1;
    }
}
int swf_SetU24(TAG*tag, U32 v)
{
    if(tag) {
        if(v&0xff000000)
          fprintf(stderr, "Error: Overflow in swf_SetU24()\n");
        swf_SetU8(tag, v);
        swf_SetU8(tag, v>>8);
        swf_SetU8(tag, v>>16);
    }
    return 3;
}
int swf_SetS24(TAG*tag, U32 v)
{
    if(tag) {
        if(!(v&0xff000000))
          return swf_SetU24(tag, v);
        if((v&0xff000000)!=0xff000000) {
          fprintf(stderr, "Error: Overflow in swf_SetS24()\n");
        }
        swf_SetU8(tag, v);
        swf_SetU8(tag, v>>8);
        swf_SetU8(tag, v>>16);
    }
    return 3;
}


int swf_SetRGB(TAG * t,RGBA * col)
{ if (!t) return -1;
  if (col)
  { swf_SetU8(t,col->r);
    swf_SetU8(t,col->g);
    swf_SetU8(t,col->b);
  } else swf_SetBlock(t,NULL,3);
  return 0;
}
void swf_GetRGB(TAG * t, RGBA * col)
{
    RGBA dummy;
    if(!col)
        col = &dummy;
    col->r = swf_GetU8(t);
    col->g = swf_GetU8(t);
    col->b = swf_GetU8(t);
    col->a = 255;
}

int swf_SetRGBA(TAG * t,RGBA * col)
{ if (!t) return -1;
  if (col)
  { swf_SetU8(t,col->r);
    swf_SetU8(t,col->g);
    swf_SetU8(t,col->b);
    swf_SetU8(t,col->a);
  } else swf_SetBlock(t,NULL,4);
  return 0;
}
void swf_GetRGBA(TAG * t, RGBA * col)
{
    RGBA dummy;
    if(!col)
        col = &dummy;
    col->r = swf_GetU8(t);
    col->g = swf_GetU8(t);
    col->b = swf_GetU8(t);
    col->a = swf_GetU8(t);
}

void swf_GetGradient(TAG * tag, GRADIENT * gradient, char alpha)
{
    int t;
    if(!tag) {
      memset(gradient, 0, sizeof(GRADIENT));
      return;
    }
    U8 num = swf_GetU8(tag) & 15;
    if(gradient) {
        gradient->num = num;
        gradient->rgba = (RGBA*)rfx_calloc(sizeof(RGBA)*gradient->num);
        gradient->ratios = (U8*)rfx_calloc(sizeof(gradient->ratios[0])*gradient->num);
    }
    for(t=0;t<num;t++)
    {
        U8 ratio = swf_GetU8(tag);
        RGBA color;
        if(!alpha)
            swf_GetRGB(tag, &color);
        else
            swf_GetRGBA(tag, &color);
        if(gradient) {
          gradient->ratios[t] = ratio;
          gradient->rgba[t] = color;
        }
    }
}

void swf_SetGradient(TAG * tag, GRADIENT * gradient, char alpha)
{
    int t;
    if(!tag) {
      memset(gradient, 0, sizeof(GRADIENT));
      return;
    }
    swf_SetU8(tag, gradient->num);
    for(t=0; t<8 && t<gradient->num; t++)
    {
        swf_SetU8(tag, gradient->ratios[t]);
        if(!alpha)
            swf_SetRGB(tag, &gradient->rgba[t]);
        else
            swf_SetRGBA(tag, &gradient->rgba[t]);
    }
}

void swf_FreeGradient(GRADIENT* gradient)
{
  if(gradient->ratios)
    rfx_free(gradient->ratios);
  if(gradient->rgba)
    rfx_free(gradient->rgba);
  memset(gradient, 0, sizeof(GRADIENT));
}

int swf_CountUBits(U32 v,int nbits)
{ int n = 32;
  U32 m = 0x80000000;
  if(v == 0x00000000) n = 0; 
  else
    while (!(v&m))
    { n--;
      m>>=1;
    } 
  return (n>nbits)?n:nbits;
}

int swf_CountBits(U32 v,int nbits)
{ int n = 33;
  U32 m = 0x80000000;
  if (v&m)
  { if(v == 0xffffffff) n = 1;
    else 
    while (v&m)
    { n--;
      m>>=1;
    } 
  }
  else
  { if(v == 0x00000000) n = 0; 
    else
    while (!(v&m))
    { n--;
      m>>=1;
    } 
  }
  return (n>nbits)?n:nbits;
}

int swf_GetRect(TAG * t,SRECT * r)
{ int nbits;
  SRECT dummy;
  if(!t) {r->xmin=r->xmax=r->ymin=r->ymax=0;return 0;}
  if (!r) r = &dummy;
  nbits = (int) swf_GetBits(t,5);
  r->xmin = swf_GetSBits(t,nbits);
  r->xmax = swf_GetSBits(t,nbits);
  r->ymin = swf_GetSBits(t,nbits);
  r->ymax = swf_GetSBits(t,nbits);
  return 0;
}

int reader_GetRect(reader_t*reader,SRECT * r)
{ int nbits;
  SRECT dummy;
  if (!r) r = &dummy;
  nbits = (int) reader_GetBits(reader,5);
  r->xmin = reader_GetSBits(reader,nbits);
  r->xmax = reader_GetSBits(reader,nbits);
  r->ymin = reader_GetSBits(reader,nbits);
  r->ymax = reader_GetSBits(reader,nbits);
  return 0;
}

int swf_SetRect(TAG * t,SRECT * r)
{ int nbits;
    
  nbits = swf_CountBits(r->xmin,0);
  nbits = swf_CountBits(r->xmax,nbits);
  nbits = swf_CountBits(r->ymin,nbits);
  nbits = swf_CountBits(r->ymax,nbits);
  if(nbits>=32) {
    #ifdef DEBUG_RFXSWF
    fprintf(stderr, "rfxswf: Warning: num_bits overflow in swf_SetRect\n");
    #endif
    nbits=31;
  }

  swf_SetBits(t,nbits,5);
  swf_SetBits(t,r->xmin,nbits);
  swf_SetBits(t,r->xmax,nbits);
  swf_SetBits(t,r->ymin,nbits);
  swf_SetBits(t,r->ymax,nbits);

  return 0;
}

SRECT swf_ClipRect(SRECT border, SRECT r)
{
    if(r.xmax > border.xmax) r.xmax = border.xmax;
    if(r.ymax > border.ymax) r.ymax = border.ymax;
    if(r.xmax < border.xmin) r.xmax = border.xmin;
    if(r.ymax < border.ymin) r.ymax = border.ymin;
    
    if(r.xmin > border.xmax) r.xmin = border.xmax;
    if(r.ymin > border.ymax) r.ymin = border.ymax;
    if(r.xmin < border.xmin) r.xmin = border.xmin;
    if(r.ymin < border.ymin) r.ymin = border.ymin;
    return r;
}

void swf_ExpandRect(SRECT*src, SPOINT add)
{
    if((src->xmin | src->ymin | src->xmax | src->ymax)==0) {
        src->xmin = add.x;
        src->ymin = add.y;
        src->xmax = add.x;
        src->ymax = add.y;
        if((add.x|add.y) == 0) src->xmax++; //make sure the bbox is not NULL anymore
        return;
    }
    if(add.x < src->xmin)
        src->xmin = add.x;
    if(add.x > src->xmax)
        src->xmax = add.x;
    if(add.y < src->ymin)
        src->ymin = add.y;
    if(add.y > src->ymax)
        src->ymax = add.y;
}
void swf_ExpandRect2(SRECT*src, SRECT*add)
{
    if((add->xmin | add->ymin | add->xmax | add->ymax)==0)
        return;
    if((src->xmin | src->ymin | src->xmax | src->ymax)==0)
        *src = *add;
    if(add->xmin < src->xmin)
        src->xmin = add->xmin;
    if(add->ymin < src->ymin)
        src->ymin = add->ymin;
    if(add->xmax > src->xmax)
        src->xmax = add->xmax;
    if(add->ymax > src->ymax)
        src->ymax = add->ymax;
}
void swf_ExpandRect3(SRECT*src, SPOINT center, int radius)
{
    if((src->xmin | src->ymin | src->xmax | src->ymax)==0) {
        src->xmin = center.x-radius;
        src->ymin = center.y-radius;
        src->xmax = center.x+radius;
        src->ymax = center.y+radius;
        if((center.x|center.y|radius) == 0) src->xmax++; //make sure the bbox is not NULL anymore
        return;
    }
    if(center.x - radius < src->xmin)
        src->xmin = center.x - radius;
    if(center.x + radius > src->xmax)
        src->xmax = center.x + radius;
    if(center.y - radius < src->ymin)
        src->ymin = center.y - radius;
    if(center.y + radius > src->ymax)
        src->ymax = center.y + radius;
}
SPOINT swf_TurnPoint(SPOINT p, MATRIX* m)
{
    SPOINT r;
    r.x = (int)(m->sx*(1/65536.0)*p.x + m->r1*(1/65536.0)*p.y + 0.5) + m->tx;
    r.y = (int)(m->r0*(1/65536.0)*p.x + m->sy*(1/65536.0)*p.y + 0.5) + m->ty;
    return r;
}
SRECT swf_TurnRect(SRECT r, MATRIX* m)
{
    SRECT g;
    SPOINT p1,p2,p3,p4,pp1,pp2,pp3,pp4;
    if(!m)
      return r;
    p1.x = r.xmin;p1.y = r.ymin;
    p2.x = r.xmax;p2.y = r.ymin;
    p3.x = r.xmin;p3.y = r.ymax;
    p4.x = r.xmax;p4.y = r.ymax;
    pp1 = swf_TurnPoint(p1, m);
    pp2 = swf_TurnPoint(p2, m);
    pp3 = swf_TurnPoint(p3, m);
    pp4 = swf_TurnPoint(p4, m);
    g.xmin = g.xmax = pp1.x;
    g.ymin = g.ymax = pp1.y;
    swf_ExpandRect(&g, pp2);
    swf_ExpandRect(&g, pp3);
    swf_ExpandRect(&g, pp4);
    return g;
}
        

int swf_GetMatrix(TAG * t,MATRIX * m)
{ MATRIX dummy;
  int nbits;
    
  if (!m) m = &dummy;
  
  if (!t)
  { m->sx = m->sy = 0x10000;
    m->r0 = m->r1 = 0;
    m->tx = m->ty = 0;
    return -1;
  }

  swf_ResetReadBits(t);
  
  if (swf_GetBits(t,1))
  { nbits = swf_GetBits(t,5);
    m->sx = swf_GetSBits(t,nbits);
    m->sy = swf_GetSBits(t,nbits);
  }
  else m->sx = m->sy = 0x10000;
  
  if (swf_GetBits(t,1))
  { nbits = swf_GetBits(t,5);
    m->r0 = swf_GetSBits(t,nbits);
    m->r1 = swf_GetSBits(t,nbits);
  }
  else m->r0 = m->r1 = 0x0;

  nbits = swf_GetBits(t,5);
  m->tx = swf_GetSBits(t,nbits);
  m->ty = swf_GetSBits(t,nbits);
  
  return 0;
}

int swf_SetMatrix(TAG * t,MATRIX * m)
{ int nbits;
  MATRIX ma;

  if (!m)
  { m = &ma;
    ma.sx = ma.sy = 0x10000;
    ma.r0 = ma.r1 = 0;
    ma.tx = ma.ty = 0;
  }

  swf_ResetWriteBits(t);

  if ((m->sx==0x10000)&&(m->sy==0x10000)) swf_SetBits(t,0,1);
  else
  { swf_SetBits(t,1,1);
    nbits = swf_CountBits(m->sx,0);
    nbits = swf_CountBits(m->sy,nbits);
    if(nbits>=32) {
        /* TODO: happens on AMD64 systems for normal values? */
        #ifdef DEBUG_RFXSWF
        fprintf(stderr,"rfxswf: Error: matrix values too large\n");
        #endif
        nbits = 31;
    }
    swf_SetBits(t,nbits,5);
    swf_SetBits(t,m->sx,nbits);
    swf_SetBits(t,m->sy,nbits);
  }

  if ((!m->r0)&&(!m->r1)) swf_SetBits(t,0,1);
  else
  { swf_SetBits(t,1,1);
    nbits = swf_CountBits(m->r0,0);
    nbits = swf_CountBits(m->r1,nbits);
    if(nbits>=32) {
        #ifdef DEBUG_RFXSWF
        fprintf(stderr,"rfxswf: Error: matrix values too large\n");
        #endif
        nbits = 31;
    }
    swf_SetBits(t,nbits,5);
    swf_SetBits(t,m->r0,nbits);
    swf_SetBits(t,m->r1,nbits);
  }

  nbits = swf_CountBits(m->tx,0);
  nbits = swf_CountBits(m->ty,nbits);
  if(nbits>=32) {
      #ifdef DEBUG_RFXSWF
      fprintf(stderr,"rfxswf: Error: matrix values too large\n");
      #endif
      nbits = 31;
  }
  swf_SetBits(t,nbits,5);
  swf_SetBits(t,m->tx,nbits);
  swf_SetBits(t,m->ty,nbits);

  return 0;
}

int swf_GetCXForm(TAG * t,CXFORM * cx,U8 alpha)
{ CXFORM cxf;
  int hasadd;
  int hasmul;
  int nbits;
    
  if (!cx) cx = &cxf;
  
  cx->a0 = cx->r0 = cx->g0 = cx->b0 = 256;
  cx->a1 = cx->r1 = cx->g1 = cx->b1 = 0;

  if (!t) return 0;
  
  swf_ResetReadBits(t);
  hasadd = swf_GetBits(t,1);
  hasmul = swf_GetBits(t,1);
  nbits  = swf_GetBits(t,4);

  if (hasmul)
  { cx->r0 = (S16)swf_GetSBits(t,nbits);
    cx->g0 = (S16)swf_GetSBits(t,nbits);
    cx->b0 = (S16)swf_GetSBits(t,nbits);
    if (alpha)
      cx->a0 = (S16)swf_GetSBits(t,nbits);
  }

  if (hasadd)
  { cx->r1 = (S16)swf_GetSBits(t,nbits);
    cx->g1 = (S16)swf_GetSBits(t,nbits);
    cx->b1 = (S16)swf_GetSBits(t,nbits);
    if (alpha)
      cx->a1 = (S16)swf_GetSBits(t,nbits);
  }
  
  return 0;
}

int swf_SetCXForm(TAG * t,CXFORM * cx,U8 alpha)
{ CXFORM cxf;
  int hasadd;
  int hasmul;
  int nbits;
    
  if (!cx)
  { cx = &cxf;
    cx->a0 = cx->r0 = cx->g0 = cx->b0 = 256;
    cx->a1 = cx->r1 = cx->g1 = cx->b1 = 0;
  }

  if (!alpha)
  { cx->a0 = 256;
    cx->a1 = 0;
  }

  nbits = 0;

  hasmul = (cx->a0!=256)||(cx->r0!=256)||(cx->g0!=256)||(cx->b0!=256);
  hasadd = cx->a1|cx->r1|cx->g1|cx->b1;

  if (hasmul)
  { if (alpha) nbits = swf_CountBits((S32)cx->a0,nbits);
    nbits = swf_CountBits((S32)cx->r0,nbits);
    nbits = swf_CountBits((S32)cx->g0,nbits);
    nbits = swf_CountBits((S32)cx->b0,nbits);
  }

  if (hasadd)
  { if (alpha) nbits = swf_CountBits((S32)cx->a1,nbits);
    nbits = swf_CountBits((S32)cx->r1,nbits);
    nbits = swf_CountBits((S32)cx->g1,nbits);
    nbits = swf_CountBits((S32)cx->b1,nbits);
  }
  
  swf_ResetWriteBits(t);
  swf_SetBits(t,hasadd?1:0,1);
  swf_SetBits(t,hasmul?1:0,1);
  swf_SetBits(t,nbits,4);

  if (hasmul)
  { swf_SetBits(t,cx->r0,nbits);
    swf_SetBits(t,cx->g0,nbits);
    swf_SetBits(t,cx->b0,nbits);
    if (alpha) swf_SetBits(t,cx->a0,nbits);
  }

  if (hasadd)
  { swf_SetBits(t,cx->r1,nbits);
    swf_SetBits(t,cx->g1,nbits);
    swf_SetBits(t,cx->b1,nbits);
    if (alpha) swf_SetBits(t,cx->a1,nbits);
  }
  
  return 0;
}

//int swf_GetPoint(TAG * t,SPOINT * p) { return 0; }
//int swf_SetPoint(TAG * t,SPOINT * p) { return 0; }

void  swf_SetPassword(TAG * t, const char * password)
{
#ifdef HAVE_MD5
    /* WARNING: crypt_md5 is not reentrant */
    char salt[3];
    char* md5string;

#if defined(HAVE_LRAND48) && defined(HAVE_SRAND48) && defined(HAVE_TIME_H) && defined(HAVE_TIME)
    srand48(time(0));
    salt[0] = "abcdefghijklmnopqrstuvwxyz0123456789"[lrand48()%36];
    salt[1] = "abcdefghijklmnopqrstuvwxyz0123456789"[lrand48()%36];
#else
    salt[0] = 'l';
    salt[1] = '8';
    fprintf(stderr, "rfxswf: Warning- no usable random generator found\n");
    fprintf(stderr, "Your password will be vulnerable to dictionary attacks\n");
#endif
    salt[2] = 0;
    
    md5string = crypt_md5(password, salt);

    swf_SetU16(t,0);
    swf_SetString(t, md5string);
#else
    fprintf(stderr, "Error: No MD5 compiled in");
#endif
} 

void swf_SetString(TAG*t, const char* s) 
{
    if(!s) {
        swf_SetU8(t, 0);
    } else {
        swf_SetBlock(t,(U8*)s,strlen(s)+1);
    }
}

int swf_VerifyPassword(TAG * t, const char * password)
{
#ifdef HAVE_MD5
    char*md5string1, *md5string2;
    char*x;
    char*salt;
    int n;

    if(t->len >= 5 && t->pos==0 && 
       t->data[0] == 0 &&
       t->data[1] == 0) {
      swf_GetU16(t);
    } else {
      printf("%d %d %d %d\n", t->len, t->pos, t->data[0], t->data[1]);
    }

    md5string1 = swf_GetString(t);

    if(strncmp(md5string1, "$1$",3 )) {
        fprintf(stderr, "rfxswf: no salt in pw string\n");
        return 0;
    }
    x = strchr(md5string1+3, '$');
    if(!x) {
        fprintf(stderr, "rfxswf: invalid salt format in pw string\n");
        return 0;
    }
    n = x-(md5string1+3);
    salt = (char*)rfx_alloc(n+1);
    memcpy(salt, md5string1+3, n);
    salt[n] = 0;

    md5string2 = crypt_md5(password, salt);
    rfx_free(salt);
    if(strcmp(md5string1, md5string2) != 0)
        return 0;
    return 1;
#else
    fprintf(stderr, "Error: No MD5 compiled in");
    return 1;
#endif
}

// Tag List Manipulating Functions

TAG * swf_InsertTag(TAG * after,U16 id)
{ TAG * t;

  t = (TAG *)rfx_calloc(sizeof(TAG));
  t->id = id;
  
  if (after)
  {
    t->prev  = after;
    t->next  = after->next;
    after->next = t;
    if (t->next) t->next->prev = t;
  }
  return t;
}

TAG * swf_InsertTagBefore(SWF* swf, TAG * before,U16 id)
{ TAG * t;

  t = (TAG *)rfx_calloc(sizeof(TAG));
  t->id = id;
  
  if (before)
  {
    t->next  = before;
    t->prev  = before->prev;
    before->prev = t;
    if (t->prev) t->prev->next = t;
  }
  if(swf && swf->firstTag == before) {
    swf->firstTag = t;
  }
  return t;
}

void swf_ClearTag(TAG * t)
{
  if (t->data) rfx_free(t->data);
  t->data = 0;
  t->pos = 0;
  t->len = 0;
  t->readBit = 0;
  t->writeBit = 0;
  t->memsize = 0;
}

void swf_ResetTag(TAG*tag, U16 id)
{
    tag->len = tag->pos = tag->readBit = tag->writeBit = 0;
    tag->id = id;
}

TAG* swf_CopyTag(TAG*tag, TAG*to_copy)
{
    tag = swf_InsertTag(tag, to_copy->id);
    swf_SetBlock(tag, to_copy->data, to_copy->len);
    return tag;
}

TAG* swf_DeleteTag(SWF*swf, TAG * t)
{
  TAG*next = t->next;

  if (swf && swf->firstTag==t) 
    swf->firstTag = t->next;
  if (t->prev) t->prev->next = t->next;
  if (t->next) t->next->prev = t->prev;

  if (t->data) rfx_free(t->data);
  rfx_free(t);
  return next;
}

TAG * swf_ReadTag(reader_t*reader, TAG * prev)
{ TAG * t;
  U16 raw;
  U32 len;
  int id;

  if (reader->read(reader, &raw, 2) !=2 ) return NULL;
  raw = LE_16_TO_NATIVE(raw);

  len = raw&0x3f;
  id  = raw>>6;

  if (len==0x3f)
  {
      len = reader_readU32(reader);
  }

  if (id==ST_DEFINESPRITE) len = 2*sizeof(U16);
  // Sprite handling fix: Flatten sprite tree

  t = (TAG *)rfx_calloc(sizeof(TAG));
  
  t->len = len;
  t->id  = id;

  if (t->len)
  { t->data = (U8*)rfx_alloc(t->len);
    t->memsize = t->len;
    if (reader->read(reader, t->data, t->len) != t->len) {
      #ifdef DEBUG_RFXSWF
      fprintf(stderr, "rfxswf: Warning: Short read (tagid %d). File truncated?\n", t->id);
      #endif
      free(t->data);t->data=0;
      free(t);
      return NULL;
    }
  }

  if (prev)
  {
    t->prev  = prev;
    prev->next = t;
  }

  return t;
}

int swf_DefineSprite_GetRealSize(TAG * t);

int swf_WriteTag2(writer_t*writer, TAG * t)
// returns tag length in bytes (incl. Header), -1 = Error
// writer = 0 -> no output
{ U16 raw[3];
  U32 len;
  int short_tag;

  if (!t) return -1;

  len = (t->id==ST_DEFINESPRITE)?swf_DefineSprite_GetRealSize(t):t->len;

  short_tag = len<0x3f&&
    (t->id!=ST_DEFINEBITSLOSSLESS&&t->id!=ST_DEFINEBITSLOSSLESS2&&t->id!=ST_SOUNDSTREAMBLOCK&&
     t->id!=ST_DEFINEBITSJPEG&&t->id!=ST_DEFINEBITSJPEG2&&t->id!=ST_DEFINEBITSJPEG3);

  if (writer)
  {
#ifdef MEASURE
  int oldpos = writer->pos;
#endif
    
    if (short_tag)
    { raw[0] = LE_16_TO_NATIVE(len|((t->id&0x3ff)<<6));
      if (writer->write(writer,raw,2)!=2)
      {
        #ifdef DEBUG_RFXSWF
          fprintf(stderr,"WriteTag() failed: Short Header.\n");
        #endif
        return -1;
      }
    }
    else
    {
      raw[0] = LE_16_TO_NATIVE((t->id<<6)|0x3f);
      if (writer->write(writer,raw,2)!=2)
      {
#ifdef DEBUG_RFXSWF
          fprintf(stderr,"WriteTag() failed: Long Header (1).\n");
#endif
          return -1;
      }
      
      writer_writeU32(writer, len);
    }
    
    if (t->data)
    { if (writer->write(writer,t->data,t->len)!=t->len)
      {
        #ifdef DEBUG_RFXSWF
          fprintf(stderr,"WriteTag() failed: Data.\n");
        #endif
        return -1;
      }
    }
    #ifdef DEBUG_RFXSWF
      else if (t->len) fprintf(stderr,"WriteTag(): Tag Data Error, id=%i\n",t->id);
    #endif

#ifdef MEASURE
  writer->flush(writer);
  printf("TAG %s costs %d bytes\n", swf_TagGetName(t), writer->pos-oldpos);
#endif
  }

  return t->len+(short_tag?2:6);
}

int swf_WriteTag(int handle, TAG * t)
{
  writer_t writer;
  int len = 0;
  if(handle<0)
    return swf_WriteTag2(0, t);
  writer_init_filewriter(&writer, handle);
  len = swf_WriteTag2(&writer, t);
  writer.finish(&writer);
  return len;
}

int swf_DefineSprite_GetRealSize(TAG * t)
// Sprite Handling: Helper function to pack DefineSprite-Tag
{ U32 len = t->len;
  if(len>4) { // folded sprite
      return t->len;
  }
  do
  { t = swf_NextTag(t);
    if (t && t->id!=ST_DEFINESPRITE) len += swf_WriteTag(-1, t);
    else t = NULL;
  } while (t&&(t->id!=ST_END));
  return len;
}

void swf_UnFoldSprite(TAG * t)
{
  U16 id,tmp;
  U32 len;
  TAG*next = t;
  U16 spriteid,spriteframes;
  int level;
  if(t->id!=ST_DEFINESPRITE)
    return;
  if(t->len<=4) // not folded
    return;

  swf_SetTagPos(t,0);

  spriteid = swf_GetU16(t); //id
  spriteframes = swf_GetU16(t); //frames

  level = 1;

  while(1)
  {
    TAG*it = 0;
    tmp = swf_GetU16(t);
    len = tmp&0x3f;
    id  = tmp>>6;
    if(id == ST_END)
        level--;
    if(id == ST_DEFINESPRITE && len<=4)
        level++;

    if (len==0x3f)
        len = swf_GetU32(t);
    it = swf_InsertTag(next, id);
    next = it;
    it->len = len;
    it->id  = id;
    if (it->len)
    { it->data = (U8*)rfx_alloc(it->len);
      it->memsize = it->len;
      swf_GetBlock(t, it->data, it->len);
    }

    if(!level)
        break;
  }
  
  rfx_free(t->data); t->data = 0;
  t->memsize = t->len = t->pos = 0;

  swf_SetU16(t, spriteid);
  swf_SetU16(t, spriteframes);
}

void swf_FoldSprite(TAG * t)
{
  TAG*sprtag=t,*tmp;
  U16 id,frames;
  int level;
  if(t->id!=ST_DEFINESPRITE)
      return;
  if(!t->len) {
    #ifdef DEBUG_RFXSWF
      fprintf(stderr, "Error: Sprite has no ID!");
    #endif
      return;
  }
  if(t->len>4) {
    /* sprite is already folded */
      return;
  }

  t->pos = 0;
  id = swf_GetU16(t);
  rfx_free(t->data);
  t->len = t->pos = t->memsize = 0;
  t->data = 0;

  frames = 0;

  t = swf_NextTag(sprtag);
  level = 1;

  do 
  { 
    if(t->id==ST_SHOWFRAME) frames++;
    if(t->id == ST_DEFINESPRITE && t->len<=4)
        level++;
    if(t->id == ST_END)
        level--;
    t = swf_NextTag(t);
  } while(t && level);
  if(level)
    fprintf(stderr, "rfxswf error: sprite doesn't end(1)\n");

  swf_SetU16(sprtag, id);
  swf_SetU16(sprtag, frames);

  t = swf_NextTag(sprtag);
  level = 1;

  do
  { 
    if(t->len<0x3f&&
        (t->id!=ST_DEFINEBITSLOSSLESS&&t->id!=ST_DEFINEBITSLOSSLESS2&&t->id!=ST_SOUNDSTREAMBLOCK&&
         t->id!=ST_DEFINEBITSJPEG&&t->id!=ST_DEFINEBITSJPEG2&&t->id!=ST_DEFINEBITSJPEG3)
      ) {
        swf_SetU16(sprtag,t->len|(t->id<<6));
    } else {
        swf_SetU16(sprtag,0x3f|(t->id<<6));
        swf_SetU32(sprtag,t->len);
    }
    if(t->len)
        swf_SetBlock(sprtag,t->data, t->len);
    tmp = t;
    if(t->id == ST_DEFINESPRITE && t->len<=4)
        level++;
    if(t->id == ST_END)
        level--;
    t = swf_NextTag(t);
    swf_DeleteTag(0, tmp);
  } 
  while (t && level);
  if(level)
    fprintf(stderr, "rfxswf error: sprite doesn't end(2)\n");

//  sprtag->next = t;
//  t->prev = sprtag;
}

int swf_IsFolded(TAG * t)
{
    return (t->id == ST_DEFINESPRITE && t->len>4);
}

void swf_FoldAll(SWF*swf)
{
    TAG*tag = swf->firstTag;
    //swf_DumpSWF(stdout, swf);
    while(tag) {
        if(tag->id == ST_DEFINESPRITE) {
            swf_FoldSprite(tag);
            //swf_DumpSWF(stdout, swf);
        }
        tag = swf_NextTag(tag);
    }
}

void swf_UnFoldAll(SWF*swf)
{
    TAG*tag = swf->firstTag;
    while(tag) {
        if(tag->id == ST_DEFINESPRITE)
            swf_UnFoldSprite(tag);
        tag = tag->next;
    }
}

void swf_OptimizeTagOrder(SWF*swf)
{
  TAG*tag,*next;
  TAG*level0;
  int level;
  int changes;
  swf_UnFoldAll(swf);
  /* at the moment, we don't actually do optimizing,
     only fixing of non-spec-conformant things like
     sprite tags */

  do {
    changes = 0;
    level = 0;
    level0 = 0;
    tag = swf->firstTag;
    while(tag) {
      next = tag->next;
      if(tag->id == ST_DEFINESPRITE) {
        if(tag->len>4) {
          /* ??? all sprites are supposed to be unfolded */
          fprintf(stderr, "librfxswf error - internal error in OptimizeTagOrder/UnfoldAll\n");
        }
        level++;
        if(level==1) {
          level0 = tag;
          tag = next;
          continue;
        }
      }
      if(level>=1) {
        /* move non-sprite tags out of sprite */
        if(!swf_isAllowedSpriteTag(tag) || level>=2) {
          /* remove tag from current position */
          tag->prev->next = tag->next;
          if(tag->next)
            tag->next->prev = tag->prev;

          /* insert before tag level0 */
          tag->next = level0;
          tag->prev = level0->prev;
          level0->prev = tag;
          if(tag->prev)
            tag->prev->next = tag;
          else
            swf->firstTag = tag;
          changes = 1;
        }
      }
      if(tag->id == ST_END) {
        level--;
      }

      tag = next;
    }
  } while(changes);
}

// Movie Functions

int swf_ReadSWF2(reader_t*reader, SWF * swf)   // Reads SWF to memory (malloc'ed), returns length or <0 if fails
{     
  if (!swf) return -1;
  memset(swf,0x00,sizeof(SWF));

  { char b[32];                         // read Header
    int len;
    TAG * t;
    TAG t1;
    reader_t zreader;
    
    if ((len = reader->read(reader ,b,8))<8) return -1;

    if (b[0]!='F' && b[0]!='C') return -1;
    if (b[1]!='W') return -1;
    if (b[2]!='S') return -1;
    swf->fileVersion = b[3];
    swf->compressed  = (b[0]=='C')?1:0;
    swf->fileSize    = GET32(&b[4]);
    
    if(swf->compressed) {
        reader_init_zlibinflate(&zreader, reader);
        reader = &zreader;
    }
    swf->compressed = 0; // derive from version number from now on

    reader_GetRect(reader, &swf->movieSize);
    reader->read(reader, &swf->frameRate, 2);
    swf->frameRate = LE_16_TO_NATIVE(swf->frameRate);
    reader->read(reader, &swf->frameCount, 2);
    swf->frameCount = LE_16_TO_NATIVE(swf->frameCount);

    /* read tags and connect to list */
    t1.next = 0;
    t = &t1;
    while (t) {
      t = swf_ReadTag(reader,t);
      if(t && t->id == ST_FILEATTRIBUTES) {
        swf->fileAttributes = swf_GetU32(t);
        swf_ResetReadBits(t);
      }
    }
    swf->firstTag = t1.next;
    if(t1.next)
      t1.next->prev = NULL;
  }
  
  return reader->pos;
}

SWF* swf_OpenSWF(char*filename)
{
  int fi = open(filename, O_RDONLY|O_BINARY);
  if(fi<0) {
      fprintf(stderr, "Failed to open %s\n", filename);
      return 0;
  }
  SWF* swf = rfx_alloc(sizeof(SWF));
  swf_ReadSWF(fi, swf);
  close(fi);
  return swf;
}

int swf_ReadSWF(int handle, SWF * swf)
{
  reader_t reader;
  reader_init_filereader(&reader, handle);
  return swf_ReadSWF2(&reader, swf);
}

void swf_ReadABCfile(char*filename, SWF*swf)
{
    memset(swf, 0, sizeof(SWF));
    swf->fileVersion=9;
    swf->fileAttributes=FILEATTRIBUTE_AS3; //as3
    TAG*tag = swf->firstTag = swf_InsertTag(0, ST_RAWABC);
    memfile_t*file = memfile_open(filename);
    swf_SetBlock(tag, file->data, file->len);
    memfile_close(file);
}

int no_extra_tags = 0;

int WriteExtraTags(SWF*swf, writer_t*writer)
{
    TAG*t = swf->firstTag;
    TAG* has_fileattributes=0;
    int has_scenedescription=0;
    int has_version_8_action=0;
    int has_version_9_action=0;
    int len = 0;
    while(t) {
        if(t->id == ST_FILEATTRIBUTES)
            has_fileattributes = t;
        if(t->id == ST_SCENEDESCRIPTION)
            has_scenedescription = 1;
        if(t->id == ST_DOABC) 
            has_version_9_action=1;
        /* FIXME: this doesn't yet find actionscript in buttons */
        if(t->id == ST_DOACTION || t->id == ST_DOINITACTION) 
            has_version_8_action=1;
        if(t->id == ST_PLACEOBJECT2 && t->len && (t->data[0]&0x80))
            has_version_8_action=1;
        t = t->next;
    }
    if(has_version_8_action && has_version_9_action) {
        fprintf(stderr, "Warning: File contains both flash 8 and flash 9 actionscript\n");
    }

    if(swf->fileVersion >= 9) {
        if(!has_fileattributes) {
            U32 flags = swf->fileAttributes|FILEATTRIBUTE_AS3; // 16 = has symbolclass tag | 8 = actionscript3 | 1 = usenetwork
            if(has_version_8_action && !has_version_9_action)
                flags &= ~FILEATTRIBUTE_AS3;
            TAG*fileattrib = swf_InsertTag(0, ST_FILEATTRIBUTES);
            swf_SetU32(fileattrib, flags);
            if(writer) {
                if(swf_WriteTag2(writer, fileattrib)<0) 
                    return -1;
            } else {
                len += swf_WriteTag(-1,fileattrib);
            }
            swf_DeleteTag(0, fileattrib);
        } else {
            if(swf->fileAttributes) {
              /* if we're writing a file out again where we might have possible
                 modified the fileattributes in the header, adjust the tag data */
              TAG*tt = swf_CopyTag(0,has_fileattributes);
              U32 flags = swf_GetU32(tt) | swf->fileAttributes;
              swf_ResetTag(tt, tt->id);
              swf_SetU32(tt, flags);
              if(swf_WriteTag2(writer, has_fileattributes)<0) return -1;
              swf_DeleteTag(0, tt);
            } else {
                if(swf_WriteTag2(writer, has_fileattributes)<0) 
                    return -1;
            }
        }
        if(0 && !has_scenedescription) {
            TAG*scene = swf_InsertTag(0, ST_SCENEDESCRIPTION);
            swf_SetU16(scene, 1);
            swf_SetString(scene, "Scene 1");
            swf_SetU8(scene, 0);
            if(writer) {
                if(swf_WriteTag2(writer, scene)<0) 
                    return -1;
            } else {
                len += swf_WriteTag(-1,scene);
            }
            swf_DeleteTag(0, scene);
        }
    }
    return len;
}

int  swf_WriteSWF2(writer_t*writer, SWF * swf)     // Writes SWF to file, returns length or <0 if fails
{ U32 len;
  TAG * t;
  int frameCount=0;
  writer_t zwriter;
  int fileSize = 0;
  int inSprite = 0;
  int ret;
  writer_t*original_writer = writer;
  int writer_lastpos = 0;
    
  if (!swf) return -1;
  if (!writer) return -1; // the caller should provide a nullwriter, not 0, for querying SWF size

  if(original_writer) writer_lastpos = original_writer->pos;

  // Count Frames + File Size

  len = 0;
  t = swf->firstTag;
  frameCount = 0;

  if(swf->firstTag && !no_extra_tags) {
    len += WriteExtraTags(swf, 0);
  }
  while(t) {
      len += swf_WriteTag(-1,t);
      if(t->id == ST_DEFINESPRITE && !swf_IsFolded(t)) inSprite++;
      else if(t->id == ST_END && inSprite) inSprite--;
      else if(t->id == ST_END && !inSprite) {
        if(t->prev && t->prev->id!=ST_SHOWFRAME)
          frameCount++;
      }
      else if(t->id == ST_SHOWFRAME && !inSprite) frameCount++;
      t = swf_NextTag(t);
  }
  
  { TAG t1;
    char b[64],b4[4];
    U32 l;

    memset(&t1,0x00,sizeof(TAG));
    t1.data    = (U8*)b;
    t1.memsize = 64;
    
    { // measure header file size
      TAG t2;
      char b2[64];
      memset(&t2,0x00,sizeof(TAG));
      t2.data    = (U8*)b2;
      t2.memsize = 64;
      swf_SetRect(&t2, &swf->movieSize);
      swf_SetU16(&t2, swf->frameRate);
      swf_SetU16(&t2, swf->frameCount);
      l = swf_GetTagLen(&t2)+8;
    }
    if(swf->compressed == 8) {
      l -= 8;
    }

    fileSize = l+len;
    if(len) {// don't touch headers without tags
        swf->fileSize = fileSize;
        swf->frameCount = frameCount;
    }

    if(swf->compressed != 8) {
    /* compressed flag set to 8 means "skip first 8 
       header bytes". This is necessary if the caller wants to
       create compressed SWFs himself .
       It also means that we don't initialize our own zlib
       writer, but assume the caller provided one.
     */
      if(swf->compressed==1 || (swf->compressed==0 && swf->fileVersion>=6)) {
        char*id = "CWS";
        writer->write(writer, id, 3);
      } else {
        char*id = "FWS";
        writer->write(writer, id, 3);
      }

      writer->write(writer, &swf->fileVersion, 1);
      PUT32(b4, swf->fileSize);
      writer->write(writer, b4, 4);
      
      if(swf->compressed==1 || (swf->compressed==0 && swf->fileVersion>=6)) {
        writer_init_zlibdeflate(&zwriter, writer);
        writer = &zwriter;
      }
    }

    swf_SetRect(&t1,&swf->movieSize);
    swf_SetU16(&t1,swf->frameRate);
    swf_SetU16(&t1,swf->frameCount);

    ret = writer->write(writer,b,swf_GetTagLen(&t1));
    if (ret!=swf_GetTagLen(&t1))
    {
      #ifdef DEBUG_RFXSWF
        fprintf(stderr, "ret:%d\n",ret);
        perror("write:");
        fprintf(stderr,"WriteSWF() failed: Header.\n");
      #endif
      return -1;
    }

    if(swf->firstTag && !no_extra_tags) {
        WriteExtraTags(swf, writer);
    }
    t = swf->firstTag;

    while (t) { 
        if(no_extra_tags || t->id != ST_FILEATTRIBUTES) {
          if(swf_WriteTag2(writer, t)<0) 
            return -1;
        }
        t = t->next;
    }
    if(swf->compressed==1 || (swf->compressed==0 && swf->fileVersion>=6) || swf->compressed==8) {
      if(swf->compressed != 8) {
        zwriter.finish(&zwriter);
        return original_writer->pos - writer_lastpos;
      }
      return (int)fileSize;
    } else {
      return (int)fileSize;
    }
  }
}

int swf_SaveSWF(SWF * swf, char*filename)
{
    int fi = open(filename, O_BINARY|O_RDWR|O_TRUNC|O_CREAT, 0777);
    if(fi<0) {
        perror(filename);
        return 0;
    }
    if(swf_WriteSWF(fi, swf)<0) {
        fprintf(stderr, "Unable to write output file: %s\n", filename);
        return 0;
    }
    close(fi);
    return 1;
}

int  swf_WriteSWF(int handle, SWF * swf)     // Writes SWF to file, returns length or <0 if fails
{
  writer_t writer;
  int len = 0;
  
  if(handle<0) {
    writer_init_nullwriter(&writer);
    len = swf_WriteSWF2(&writer, swf);
    return len;
  }
  writer_init_filewriter(&writer, handle);
  len = swf_WriteSWF2(&writer, swf);
  writer.finish(&writer);
  return len;
}

int swf_WriteHeader2(writer_t*writer,SWF * swf)
{
  SWF myswf;
  memcpy(&myswf,swf,sizeof(SWF));
  myswf.firstTag = 0;
  return swf_WriteSWF2(writer, &myswf);
}

int swf_WriteHeader(int handle,SWF * swf)
{
  SWF myswf;
  memcpy(&myswf,swf,sizeof(SWF));
  myswf.firstTag = 0;
  return swf_WriteSWF(handle, &myswf);
}

int swf_WriteCGI(SWF * swf)
{ int len;
  char s[1024];
    
  len = swf_WriteSWF(-1,swf);

  if (len<0) return -1;

  sprintf(s,"Content-type: application/x-shockwave-flash\n"
            "Accept-Ranges: bytes\n"
            "Content-Length: %d\n"
            "Expires: Thu, 13 Apr 2000 23:59:59 GMT\n"
            "\n",len);
            
  write(fileno(stdout),s,strlen(s));
  return swf_WriteSWF(fileno(stdout),swf);
}

SWF* swf_CopySWF(SWF*swf)
{
    SWF*nswf = (SWF*)rfx_alloc(sizeof(SWF));
    TAG*tag, *ntag;
    memcpy(nswf, swf, sizeof(SWF));
    nswf->firstTag = 0;
    tag = swf->firstTag;
    ntag = 0;
    while(tag) {
        ntag = swf_CopyTag(ntag, tag);
        if(!nswf->firstTag)
            nswf->firstTag = ntag;
        tag = tag->next;
    }
    return nswf;
}

void swf_FreeTags(SWF * swf)                 // Frees all malloc'ed memory for tags
{ TAG * t = swf->firstTag;

  while (t)
  { TAG * tnew = t->next;
    if (t->data) rfx_free(t->data);
    rfx_free(t);
    t = tnew;
  }
  swf->firstTag = 0;
}

// include advanced functions

//#include "modules/swfdump.c"
//#include "modules/swfshape.c"
//#include "modules/swftext.c"
//#include "modules/swffont.c"
//#include "modules/swfobject.c"
//#include "modules/swfbutton.c"
//#include "modules/swftools.c"
//#include "modules/swfcgi.c"
//#include "modules/swfbits.c"
//#include "modules/swfaction.c"
//#include "modules/swfabc.c"
//#include "modules/swfsound.c"
//#include "modules/swfdraw.c"
//#include "modules/swfrender.c"
//#include "modules/swffilter.c"