X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=lib%2Frfxswf.c;h=ad3ad217d5db1aabad06bc267f39b4bab0a7082f;hp=14ec250bccbe682c88a9ae0f5a86c41fcea44200;hb=f3784f411338b99aa3b04c5e881c995227c8a053;hpb=4ca7f5a76f6cd8a8397ecb1078b87e038719a050

diff --git a/lib/rfxswf.c b/lib/rfxswf.c
index 14ec250..ad3ad21 100644
--- a/lib/rfxswf.c
+++ b/lib/rfxswf.c
@@ -24,6 +24,7 @@
    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_JPEGLIB
@@ -55,7 +56,6 @@
 
 #define MEMSIZE(l) (((l/MALLOC_SIZE)+1)*MALLOC_SIZE)
 
-
 // inline wrapper functions
 
 TAG * swf_NextTag(TAG * t) { return t->next; }
@@ -65,11 +65,6 @@ 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; }
 
-// Basic Data Access Functions
-
-#define swf_ResetReadBits(tag)   if (tag->readBit)  { tag->pos++; tag->readBit = 0; }
-#define swf_ResetWriteBits(tag)  if (tag->writeBit) { tag->writeBit = 0; }
-
 // for future purpose: avoid high level lib functions to change tagpos/bitpos
 
 #define swf_SaveTagPos(tag)
@@ -78,15 +73,26 @@ 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;
-  #ifdef DEBUG_RFXSWF
-  else fprintf(stderr,"SetTagPos() out of bounds: TagID = %i\n",t->id);
-  #endif
+  else { 
+#ifdef DEBUG_RFXSWF
+    fprintf(stderr,"SetTagPos(%d) out of bounds: TagID = %i\n",pos, t->id);
+#endif
+  }
 }
 
 char* swf_GetString(TAG*t)
 {
     char* str = ((char*)(&(t)->data[(t)->pos]));
-    while(swf_GetU8(t));
+    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 str;
 }
 
@@ -146,15 +152,7 @@ int swf_SetBlock(TAG * t,U8 * b,int l)
   swf_ResetWriteBits(t);
   if (newlen>t->memsize)
   { U32  newmem  = MEMSIZE(newlen);  
-    U8 * newdata = (U8*)((t->data)?realloc(t->data,newmem):malloc(newmem));
-    if (!newdata)
-    {
-      #ifdef DEBUG_RFXSWF
-        fprintf(stderr,"Fatal Error: malloc()/realloc() failed (1). (%d bytes)\n", newmem);
-	*(int*)0=0;
-      #endif
-      return 0;
-    }
+    U8 * newdata = (U8*)(rfx_realloc(t->data,newmem));
     t->memsize = newmem;
     t->data    = newdata;
   }
@@ -182,6 +180,13 @@ int swf_SetU16(TAG * t,U16 v)
   t->data[t->len++] = a[1];
   return 0;
 }
+void swf_SetS16(TAG * t,int v)
+{
+    if(v>32767 || v<-32768) {
+	fprintf(stderr, "Warning: S16 overflow: %d\n", v);
+    }
+    swf_SetU16(t, (S16)v);
+}
 
 int swf_SetU32(TAG * t,U32 v)
 { U8 a[4];
@@ -228,10 +233,10 @@ S32 swf_GetSBits(TAG * t,int nbits)
   return (S32)res;
 }
 
-U32 reader_GetBits(struct reader_t*reader, int nbits)
+U32 reader_GetBits(reader_t*reader, int nbits)
 { return reader_readbits(reader, nbits);
 }
-S32 reader_GetSBits(struct reader_t*reader, int 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;
@@ -288,7 +293,7 @@ int swf_SetRGBA(TAG * t,RGBA * col)
 void swf_GetRGBA(TAG * t, RGBA * col)
 {
     RGBA dummy;
-    if(!col);
+    if(!col)
 	col = &dummy;
     col->r = swf_GetU8(t);
     col->g = swf_GetU8(t);
@@ -385,7 +390,7 @@ int swf_GetRect(TAG * t,SRECT * r)
   return 0;
 }
 
-int reader_GetRect(struct reader_t*reader,SRECT * r)
+int reader_GetRect(reader_t*reader,SRECT * r)
 { int nbits;
   SRECT dummy;
   if (!r) r = &dummy;
@@ -420,6 +425,14 @@ int swf_SetRect(TAG * t,SRECT * 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)
@@ -433,6 +446,8 @@ 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)
@@ -442,6 +457,25 @@ void swf_ExpandRect2(SRECT*src, SRECT*add)
     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;
@@ -453,6 +487,8 @@ 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;
@@ -525,6 +561,7 @@ int swf_SetMatrix(TAG * t,MATRIX * m)
     nbits = swf_CountBits(m->sx,0);
     nbits = swf_CountBits(m->sy,nbits);
     if(nbits>=32) {
+        /* TODO: happens on AMD64 systems for normal values? */
 	fprintf(stderr,"rfxswf: Error: matrix values too large\n");
 	nbits = 31;
     }
@@ -560,7 +597,7 @@ int swf_SetMatrix(TAG * t,MATRIX * m)
   return 0;
 }
 
-int swf_GetCXForm(TAG * t,CXFORM * cx,U8 alpha) //FIXME: alpha should be type bool
+int swf_GetCXForm(TAG * t,CXFORM * cx,U8 alpha)
 { CXFORM cxf;
   int hasadd;
   int hasmul;
@@ -674,6 +711,7 @@ void  swf_SetPassword(TAG * t, const char * password)
     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);
 
@@ -708,12 +746,12 @@ int swf_VerifyPassword(TAG * t, const char * password)
 	return 0;
     }
     n = x-(md5string1+3);
-    salt = (char*)malloc(n+1);
+    salt = (char*)rfx_alloc(n+1);
     memcpy(salt, md5string1+3, n);
     salt[n] = 0;
 
     md5string2 = crypt_md5(password, salt);
-    free(salt);
+    rfx_free(salt);
     if(strcmp(md5string1, md5string2) != 0)
 	return 0;
     return 1;
@@ -724,18 +762,15 @@ int swf_VerifyPassword(TAG * t, const char * password)
 TAG * swf_InsertTag(TAG * after,U16 id)
 { TAG * t;
 
-  t = (TAG *)malloc(sizeof(TAG));
-  if (t)
-  { memset(t,0x00,sizeof(TAG));
-    t->id = id;
-    
-    if (after)
-    {
-      t->prev  = after;
-      t->next  = after->next;
-      after->next = t;
-      if (t->next) t->next->prev = 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;
 }
@@ -743,18 +778,15 @@ TAG * swf_InsertTag(TAG * after,U16 id)
 TAG * swf_InsertTagBefore(SWF* swf, TAG * before,U16 id)
 { TAG * t;
 
-  t = (TAG *)malloc(sizeof(TAG));
-  if (t)
-  { memset(t,0x00,sizeof(TAG));
-    t->id = id;
-    
-    if (before)
-    {
-      t->next  = before;
-      t->prev  = before->prev;
-      before->prev = t;
-      if (t->prev) t->prev->next = 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;
@@ -764,7 +796,7 @@ TAG * swf_InsertTagBefore(SWF* swf, TAG * before,U16 id)
 
 void swf_ClearTag(TAG * t)
 {
-  if (t->data) free(t->data);
+  if (t->data) rfx_free(t->data);
   t->data = 0;
   t->pos = 0;
   t->len = 0;
@@ -779,18 +811,25 @@ void swf_ResetTag(TAG*tag, U16 id)
     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;
+}
+
 int swf_DeleteTag(TAG * t)
 { if (!t) return -1;
 
   if (t->prev) t->prev->next = t->next;
   if (t->next) t->next->prev = t->prev;
 
-  if (t->data) free(t->data);
-  free(t);
+  if (t->data) rfx_free(t->data);
+  rfx_free(t);
   return 0;
 }
 
-TAG * swf_ReadTag(struct reader_t*reader, TAG * prev)
+TAG * swf_ReadTag(reader_t*reader, TAG * prev)
 { TAG * t;
   U16 raw;
   U32 len;
@@ -811,32 +850,20 @@ TAG * swf_ReadTag(struct reader_t*reader, TAG * prev)
   if (id==ST_DEFINESPRITE) len = 2*sizeof(U16);
   // Sprite handling fix: Flatten sprite tree
 
-  t = (TAG *)malloc(sizeof(TAG));
-  
-  if (!t)
-  {
-    #ifdef DEBUG_RFXSWF
-      fprintf(stderr,"Fatal Error: malloc()/realloc() failed (2). (%d bytes)\n", sizeof(TAG));
-    #endif
-    return NULL;
-  }
-
-  memset(t,0x00,sizeof(TAG));
+  t = (TAG *)rfx_calloc(sizeof(TAG));
   
   t->len = len;
   t->id  = id;
 
   if (t->len)
-  { t->data = (U8*)malloc(t->len);
-    if (!t->data)
-    {
-      #ifdef DEBUG_RFXSWF
-        fprintf(stderr,"Fatal Error: malloc()/realloc() failed (3). (%d bytes)\n", t->len);
-      #endif
+  { t->data = (U8*)rfx_alloc(t->len);
+    t->memsize = t->len;
+    if (reader->read(reader, t->data, t->len) != t->len) {
+      fprintf(stderr, "rfxswf: Warning: Short read (tagid %d). File truncated?\n", t->id);
+      free(t->data);t->data=0;
+      free(t);
       return NULL;
     }
-    t->memsize = t->len;
-    if (reader->read(reader, t->data, t->len) != t->len) return NULL;
   }
 
   if (prev)
@@ -850,7 +877,7 @@ TAG * swf_ReadTag(struct reader_t*reader, TAG * prev)
 
 int swf_DefineSprite_GetRealSize(TAG * t);
 
-int swf_WriteTag2(struct writer_t*writer, 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];
@@ -861,7 +888,9 @@ int swf_WriteTag2(struct writer_t*writer, TAG * t)
 
   len = (t->id==ST_DEFINESPRITE)?swf_DefineSprite_GetRealSize(t):t->len;
 
-  short_tag = len<0x3f;
+  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)
   { if (short_tag)
@@ -914,11 +943,14 @@ int swf_WriteTag2(struct writer_t*writer, TAG * t)
 
 int swf_WriteTag(int handle, TAG * t)
 {
-  struct writer_t writer;
+  writer_t writer;
+  int len = 0;
   if(handle<0)
     return swf_WriteTag2(0, t);
   writer_init_filewriter(&writer, handle);
-  return swf_WriteTag2(&writer, t);
+  len = swf_WriteTag2(&writer, t);
+  writer.finish(&writer);
+  return len;
 }
 
 int swf_DefineSprite_GetRealSize(TAG * t)
@@ -972,7 +1004,7 @@ void swf_UnFoldSprite(TAG * t)
     it->len = len;
     it->id  = id;
     if (it->len)
-    { it->data = (U8*)malloc(it->len);
+    { it->data = (U8*)rfx_alloc(it->len);
       it->memsize = it->len;
       swf_GetBlock(t, it->data, it->len);
     }
@@ -981,7 +1013,7 @@ void swf_UnFoldSprite(TAG * t)
 	break;
   }
   
-  free(t->data); t->data = 0;
+  rfx_free(t->data); t->data = 0;
   t->memsize = t->len = t->pos = 0;
 
   swf_SetU16(t, spriteid);
@@ -1006,7 +1038,7 @@ void swf_FoldSprite(TAG * t)
 
   t->pos = 0;
   id = swf_GetU16(t);
-  free(t->data);
+  rfx_free(t->data);
   t->len = t->pos = t->memsize = 0;
   t->data = 0;
 
@@ -1035,7 +1067,10 @@ void swf_FoldSprite(TAG * t)
 
   do
   { 
-    if(t->len<0x3f) {
+    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));
@@ -1077,14 +1112,6 @@ void swf_FoldAll(SWF*swf)
     }
 }
 
-void swf_FoldAllTags(TAG*tag)
-{
-    SWF swf;
-    memset(&swf, 0, sizeof(swf));
-    swf.firstTag = tag;
-    swf_FoldAll(&swf);
-}
-
 void swf_UnFoldAll(SWF*swf)
 {
     TAG*tag = swf->firstTag;
@@ -1137,7 +1164,10 @@ void swf_OptimizeTagOrder(SWF*swf)
 	  tag->next = level0;
 	  tag->prev = level0->prev;
 	  level0->prev = tag;
-	  tag->prev->next = tag;
+          if(tag->prev)
+	    tag->prev->next = tag;
+          else
+            swf->firstTag = tag;
 	  changes = 1;
 	}
       }
@@ -1152,7 +1182,7 @@ void swf_OptimizeTagOrder(SWF*swf)
 
 // Movie Functions
 
-int swf_ReadSWF2(struct reader_t*reader, SWF * swf)   // Reads SWF to memory (malloc'ed), returns length or <0 if fails
+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));
@@ -1161,7 +1191,7 @@ int swf_ReadSWF2(struct reader_t*reader, SWF * swf)   // Reads SWF to memory (ma
     int len;
     TAG * t;
     TAG t1;
-    struct reader_t zreader;
+    reader_t zreader;
     
     if ((len = reader->read(reader ,b,8))<8) return -1;
 
@@ -1195,28 +1225,44 @@ int swf_ReadSWF2(struct reader_t*reader, SWF * swf)   // Reads SWF to memory (ma
 
 int swf_ReadSWF(int handle, SWF * swf)
 {
-  struct reader_t reader;
+  reader_t reader;
   reader_init_filereader(&reader, handle);
   return swf_ReadSWF2(&reader, swf);
 }
 
-int  swf_WriteSWF2(struct writer_t*writer, SWF * swf)     // Writes SWF to file, returns length or <0 if fails
+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;
-  struct writer_t zwriter;
+  writer_t zwriter;
   int fileSize = 0;
   int inSprite = 0;
+  int writer_lastpos = 0;
+  int ret;
     
   if (!swf) return -1;
+  if (!writer) return -1; // the caller should provide a nullwriter, not 0, for querying SWF size
+
+  if(writer) writer_lastpos = writer->pos;
+
+  if(swf->fileVersion >= 8) {
+      if ((swf->firstTag && swf->firstTag->id != ST_FILEATTRIBUTES) &&
+	  (!swf->firstTag->next || swf->firstTag->next->id != ST_FILEATTRIBUTES)) 
+      {
+	  U32 flags = 0; // | 128 = usenetwork, | 8 = hasmetadata
+	  swf_SetU32(swf_InsertTagBefore(swf, swf->firstTag,ST_FILEATTRIBUTES),flags);
+      }
+  }
 
   // Insert REFLEX Tag
 
 #ifdef INSERT_RFX_TAG
 
-  if (swf->firstTag && swf_NextTag(swf->firstTag))
-    if (swf_GetTagID(swf_NextTag(swf->firstTag))!=ST_REFLEX)
-      swf_SetBlock(swf_InsertTag(swf->firstTag,ST_REFLEX),"rfx",3);
+  if ((swf->firstTag && swf->firstTag->id != ST_REFLEX) &&
+      (!swf->firstTag->next || swf->firstTag->next->id != ST_REFLEX)) 
+  {
+      swf_SetBlock(swf_InsertTagBefore(swf, swf->firstTag,ST_REFLEX),"rfx",3);
+  }
 
 #endif // INSERT_RFX_TAG
 
@@ -1228,8 +1274,12 @@ int  swf_WriteSWF2(struct writer_t*writer, SWF * swf)     // Writes SWF to file,
 
   while(t) {
       len += swf_WriteTag(-1,t);
-      if(t->id == ST_DEFINESPRITE) inSprite++;
+      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);
   }
@@ -1266,7 +1316,10 @@ int  swf_WriteSWF2(struct writer_t*writer, SWF * swf)     // Writes SWF to file,
     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 */
+       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) {
 	char*id = "CWS";
 	writer->write(writer, id, 3);
@@ -1290,56 +1343,68 @@ int  swf_WriteSWF2(struct writer_t*writer, SWF * swf)     // Writes SWF to file,
     swf_SetU16(&t1,swf->frameRate);
     swf_SetU16(&t1,swf->frameCount);
 
-    if (writer)
-    { 
-      int 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;
-      }
+    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;
+    }
 
-      t = swf->firstTag;
-      while (t)
-      { if (swf_WriteTag2(writer, t)<0) return -1;
-        t = swf_NextTag(t);
+    t = swf->firstTag;
+    while (t)
+    { if (swf_WriteTag2(writer, t)<0) return -1;
+      t = swf_NextTag(t);
+    }
+    if(swf->compressed) {
+      if(swf->compressed != 8) {
+	zwriter.finish(&zwriter);
+	return writer->pos - writer_lastpos;
       }
-      if(swf->compressed != 8)
-	writer->finish(writer); // flush zlib buffers - only if _we_ initialized that writer.
+      return (int)fileSize;
+    } else {
+      return (int)fileSize;
     }
   }
-  return (int)fileSize;
 }
 
 int  swf_WriteSWF(int handle, SWF * swf)     // Writes SWF to file, returns length or <0 if fails
 {
-  struct writer_t writer;
+  writer_t writer;
+  int len = 0;
   swf->compressed = 0;
+  
   if(handle<0) {
     writer_init_nullwriter(&writer);
-    return swf_WriteSWF2(&writer, swf);
+    len = swf_WriteSWF2(&writer, swf);
+    return len;
   }
   writer_init_filewriter(&writer, handle);
-  return swf_WriteSWF2(&writer, swf);
+  len = swf_WriteSWF2(&writer, swf);
+  writer.finish(&writer);
+  return len;
 }
 
 int  swf_WriteSWC(int handle, SWF * swf)     // Writes SWF to file, returns length or <0 if fails
 {
-  struct writer_t writer;
+  writer_t writer;
+  int len = 0;
   swf->compressed = 1;
+
   if(handle<0) {
     writer_init_nullwriter(&writer);
-    return swf_WriteSWF2(&writer, swf);
+    len = swf_WriteSWF2(&writer, swf);
   }
   writer_init_filewriter(&writer, handle);
-  return swf_WriteSWF2(&writer, swf);
+  len = swf_WriteSWF2(&writer, swf);
+  writer.finish(&writer);
+  return len;
 }
 
-int swf_WriteHeader2(struct writer_t*writer,SWF * swf)
+int swf_WriteHeader2(writer_t*writer,SWF * swf)
 {
   SWF myswf;
   memcpy(&myswf,swf,sizeof(SWF));
@@ -1373,15 +1438,33 @@ int swf_WriteCGI(SWF * swf)
   return swf_WriteSWF(fileno(stdout),swf);
 }
 
+SWF* swf_CopySWF(SWF*swf)
+{
+    SWF*nswf = 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) free(t->data);
-    free(t);
+    if (t->data) rfx_free(t->data);
+    rfx_free(t);
     t = tnew;
   }
+  swf->firstTag = 0;
 }
 
 // include advanced functions
@@ -1398,3 +1481,4 @@ void swf_FreeTags(SWF * swf)                 // Frees all malloc'ed memory for t
 #include "modules/swfaction.c"
 #include "modules/swfsound.c"
 #include "modules/swfdraw.c"
+#include "modules/swfrender.c"