src/swfextract.c

   1 /* swfextract.c
   2    Allows to extract parts of the swf into a new file.
   3
   4    Part of the swftools package.
   5
   6    Copyright (c) 2001 Matthias Kramm <kramm@quiss.org>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  21
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include "../lib/rfxswf.h"
  26 #include "../lib/args.h"
  27 #include "../lib/log.h"
  28 #ifdef HAVE_ZLIB_H
  29 #ifdef HAVE_LIBZ
  30 #include "zlib.h"
  31 #define _ZLIB_INCLUDED_
  32 #endif
  33 #endif
  34
  35 char * filename = 0;
  36 char * destfilename = "output.swf";
  37 int verbose = 3;
  38
  39 char* extractids = 0;
  40 char* extractframes = 0;
  41 char* extractjpegids = 0;
  42 char* extractfontids = 0;
  43 char* extractpngids = 0;
  44 char* extractsoundids = 0;
  45 char extractmp3 = 0;
  46
  47 char* extractname = 0;
  48
  49 char hollow = 0;
  50 char originalplaceobjects = 0;
  51
  52 int numextracts = 0;
  53
  54 struct options_t options[] =
  55 {
  56  {"o","output"},
  57  {"w","hollow"},
  58  {"v","verbose"},
  59  {"i","id"},
  60  {"j","jpegs"},
  61  {"p","pngs"},
  62  {"P","placeobject"},
  63  {"m","mp3"},
  64  {"s","sound"},
  65  {"n","name"},
  66  {"f","frame"},
  67  {"F","font"},
  68  {"V","version"},
  69  {0,0}
  70 };
  71
  72
  73 int args_callback_option(char*name,char*val)
  74 {
  75     if(!strcmp(name, "V")) {
  76         printf("swfextract - part of %s %s\n", PACKAGE, VERSION);
  77         exit(0);
  78     }
  79     else if(!strcmp(name, "o")) {
  80         destfilename = val;
  81         return 1;
  82     }
  83     else if(!strcmp(name, "i")) {
  84         extractids = val;
  85         numextracts++;
  86         if(extractname) {
  87             fprintf(stderr, "You can only supply either name or id\n");
  88             exit(1);
  89         }
  90         return 1;
  91     }
  92     else if(!strcmp(name, "n")) {
  93         extractname = val;
  94         numextracts++;
  95         if(extractids) {
  96             fprintf(stderr, "You can only supply either name or id\n");
  97             exit(1);
  98         }
  99         return 1;
 100     }
 101     else if(!strcmp(name, "v")) {
 102         verbose ++;
 103         return 0;
 104     }
 105     else if(!strcmp(name, "m")) {
 106         extractmp3 = 1;
 107         numextracts++;
 108         return 0;
 109     }
 110     else if(!strcmp(name, "j")) {
 111         if(extractjpegids) {
 112             fprintf(stderr, "Only one --jpegs argument is allowed. (Try to use a range, e.g. -j 1,2,3)\n");
 113             exit(1);
 114         }
 115         numextracts++;
 116         extractjpegids = val;
 117         return 1;
 118     }
 119     else if(!strcmp(name, "F")) {
 120         if(extractfontids) {
 121             fprintf(stderr, "Only one --font argument is allowed. (Try to use a range, e.g. -s 1,2,3)\n");
 122             exit(1);
 123         }
 124         numextracts++;
 125         extractfontids = val;
 126         return 1;
 127     }
 128     else if(!strcmp(name, "s")) {
 129         if(extractsoundids) {
 130             fprintf(stderr, "Only one --sound argument is allowed. (Try to use a range, e.g. -s 1,2,3)\n");
 131             exit(1);
 132         }
 133         numextracts++;
 134         extractsoundids = val;
 135         return 1;
 136     }
 137 #ifdef _ZLIB_INCLUDED_
 138     else if(!strcmp(name, "p")) {
 139         if(extractpngids) {
 140             fprintf(stderr, "Only one --png argument is allowed. (Try to use a range, e.g. -p 1,2,3)\n");
 141             exit(1);
 142         }
 143         numextracts++;
 144         extractpngids = val;
 145         return 1;
 146     }
 147 #endif
 148     else if(!strcmp(name, "f")) {
 149         numextracts++;
 150         extractframes = val;
 151         return 1;
 152     }
 153     else if(!strcmp(name, "P")) {
 154         originalplaceobjects = 1;
 155         return 0;
 156     }
 157     else if(!strcmp(name, "w")) {
 158         hollow = 1;
 159         return 0;
 160     }
 161     else {
 162         printf("Unknown option: -%s\n", name);
 163         exit(1);
 164     }
 165
 166     return 0;
 167 }
 168 int args_callback_longoption(char*name,char*val)
 169 {
 170     return args_long2shortoption(options, name, val);
 171 }
 172 void args_callback_usage(char*name)
 173 {
 174     printf("Usage: %s [-v] [-n name] [-ijf ids] file.swf\n", name);
 175     printf("\t-v , --verbose\t\t\t Be more verbose\n");
 176     printf("\t-o , --output filename\t\t set output filename\n");
 177     printf("\t-V , --version\t\t\t Print program version and exit\n\n");
 178     printf("SWF Subelement extraction:\n");
 179     printf("\t-n , --name name\t\t instance name of the object (SWF Define) to extract\n");
 180     printf("\t-i , --id ID\t\t\t ID of the object, shape or movieclip to extract\n");
 181     printf("\t-f , --frame frames\t\t frame numbers to extract\n");
 182     printf("\t-w , --hollow\t\t\t hollow mode: don't remove empty frames\n");
 183     printf("\t             \t\t\t (use with -f)\n");
 184     printf("\t-P , --placeobject\t\t\t Insert original placeobject into output file\n");
 185     printf("\t             \t\t\t (use with -i)\n");
 186     printf("SWF Font/Text extraction:\n");
 187     printf("\t-F , --font ID\t\t\t Extract font(s)\n");
 188     printf("Picture extraction:\n");
 189     printf("\t-j , --jpeg ID\t\t\t Extract JPEG picture(s)\n");
 190 #ifdef _ZLIB_INCLUDED_
 191     printf("\t-p , --pngs ID\t\t\t Extract PNG picture(s)\n");
 192 #endif
 193     printf("\n");
 194     printf("Sound extraction:\n");
 195     printf("\t-m , --mp3\t\t\t Extract main mp3 stream\n");
 196     printf("\t-s , --sound ID\t\t\t Extract Sound(s)\n");
 197 }
 198 int args_callback_command(char*name,char*val)
 199 {
 200     if(filename) {
 201         fprintf(stderr, "Only one file allowed. You supplied at least two. (%s and %s)\n",
 202                  filename, name);
 203     }
 204     filename = name;
 205     return 0;
 206 }
 207
 208 U8 mainr,maing,mainb;
 209 /* 1 = used, not expanded,
 210    3 = used, expanded
 211    5 = wanted, not expanded
 212    7 = wanted, expanded
 213  */
 214 char used[65536];
 215 TAG*tags[65536];
 216 int changed;
 217 char * tagused;
 218 int extractname_id = -1;
 219
 220 void idcallback(void*data)
 221 {
 222     if(!(used[GET16(data)]&1)) {
 223         changed = 1;
 224         used[GET16(data)] |= 1;
 225     }
 226 }
 227
 228 void enumerateIDs(TAG*tag, void(*callback)(void*))
 229 {
 230 /*    U8*data;
 231     int len = tag->len;
 232     if(tag->len>=64) {
 233         len += 6;
 234         data = (U8*)malloc(len);
 235         PUT16(data, (tag->id<<6)+63);
 236         *(U8*)&data[2] = tag->len;
 237         *(U8*)&data[3] = tag->len>>8;
 238         *(U8*)&data[4] = tag->len>>16;
 239         *(U8*)&data[5] = tag->len>>24;
 240         memcpy(&data[6], tag->data, tag->len);
 241     } else {
 242         len += 2;
 243         data = (U8*)malloc(len);
 244         PUT16(data, (tag->id<<6)+tag->len);
 245         memcpy(&data[2], tag->data, tag->len);
 246     }
 247     map_ids_mem(data, len, callback);
 248  */
 249     int num = swf_GetNumUsedIDs(tag);
 250     int *ptr = malloc(sizeof(int)*num);
 251     int t;
 252     swf_GetUsedIDs(tag, ptr);
 253     for(t=0;t<num;t++)
 254         callback(&tag->data[ptr[t]]);
 255 }
 256
 257 void extractTag(SWF*swf, char*filename)
 258 {
 259     SWF newswf;
 260     TAG*desttag;
 261     TAG*srctag;
 262     RGBA rgb;
 263     SRECT objectbbox;
 264     char sprite;
 265     int f;
 266     int t;
 267     int tagnum;
 268     int copy = 0;
 269     memset(&newswf,0x00,sizeof(SWF));        // set global movie parameters
 270
 271     newswf.fileVersion    = swf->fileVersion;
 272     newswf.frameRate      = swf->frameRate;
 273     newswf.movieSize      = swf->movieSize;
 274
 275     newswf.firstTag = swf_InsertTag(NULL,ST_SETBACKGROUNDCOLOR);
 276     desttag = newswf.firstTag;
 277     rgb.r = mainr;
 278     rgb.g = maing;
 279     rgb.b = mainb;
 280     swf_SetRGB(desttag,&rgb);
 281
 282     swf_GetRect(0, &objectbbox);
 283
 284     do {
 285        changed = 0;
 286        for(t=0;t<65536;t++) {
 287            if(used[t] && !(used[t]&2)) {
 288              if(tags[t]==0) {
 289                  msg("<warning> ID %d is referenced, but never defined.", t);
 290              } else if(tags[t]->id==ST_DEFINESPRITE) {
 291                  TAG*tag = tags[t];
 292                  while(tag->id != ST_END)
 293                  {
 294                      enumerateIDs(tag, idcallback);
 295                      tag = tag->next;
 296                  }
 297              }
 298              else
 299                enumerateIDs(tags[t], idcallback);
 300              used[t] |= 2;
 301            }
 302        }
 303     }
 304     while(changed);
 305
 306     srctag = swf->firstTag;
 307     tagnum = 0;
 308     sprite = 0;
 309     while(srctag && (srctag->id || sprite)) {
 310         int reset = 0;
 311         if(!sprite) {
 312             copy = 0;
 313         }
 314         if(srctag->id == ST_END) {
 315             sprite = 0;
 316         }
 317         if(srctag->id == ST_DEFINESPRITE)
 318             sprite = 1;
 319         if(swf_isDefiningTag(srctag)) {
 320             int id = swf_GetDefineID(srctag);
 321             if(used[id])  {
 322                 SRECT b;
 323                 copy = 1;
 324                 b = swf_GetDefineBBox(srctag);
 325                 swf_ExpandRect2(&objectbbox, &b);
 326             }
 327         } else
 328         if (((((srctag->id == ST_PLACEOBJECT || srctag->id == ST_PLACEOBJECT2) && originalplaceobjects)
 329               || srctag->id == ST_STARTSOUND) && (used[swf_GetPlaceID(srctag)]&4) ) ||
 330               (swf_isPseudoDefiningTag(srctag) && used[swf_GetDefineID(srctag)]) ||
 331               (tagused[tagnum]))
 332         {
 333                 if(copy == 0)
 334                     reset = 1;
 335                 copy = 1;
 336         }
 337         if(srctag->id == ST_REMOVEOBJECT) {
 338             if(!used[swf_GetPlaceID(srctag)])
 339                 copy = 0;
 340         }
 341
 342         if(copy) {
 343             TAG*ttag = (TAG*)malloc(sizeof(TAG));
 344             desttag = swf_InsertTag(desttag, srctag->id);
 345             desttag->len = desttag->memsize = srctag->len;
 346             desttag->data = malloc(srctag->len);
 347             memcpy(desttag->data, srctag->data, srctag->len);
 348             if(reset)
 349                 copy = 0;
 350         }
 351
 352         srctag = srctag->next;
 353         tagnum ++;
 354     }
 355     if(!extractframes && !hollow) {
 356         if(!originalplaceobjects && (extractids||extractname_id>=0)) {
 357             int t;
 358             int s=0;
 359             if((objectbbox.xmin|objectbbox.ymin|objectbbox.xmax|objectbbox.ymax)!=0)
 360                 newswf.movieSize = objectbbox;
 361             if(extractname_id>=0) {
 362                 desttag = swf_InsertTag(desttag, ST_PLACEOBJECT2);
 363                 swf_ObjectPlace(desttag, extractname_id, extractname_id, 0,0,extractname);
 364             } else {
 365                 for(t=0;t<65536;t++) {
 366                     if(is_in_range(t, extractids)) {
 367                         desttag = swf_InsertTag(desttag, ST_PLACEOBJECT2);
 368                         swf_ObjectPlace(desttag, t, t, 0,0,0);
 369                         s++;
 370                         if(s==2)
 371                             printf("warning! You should use the -P when extracting multiple objects\n");
 372                     }
 373                 }
 374             }
 375         }
 376         desttag = swf_InsertTag(desttag,ST_SHOWFRAME);
 377     }
 378     desttag = swf_InsertTag(desttag,ST_END);
 379
 380     f = open(filename, O_TRUNC|O_WRONLY|O_CREAT|O_BINARY, 0644);
 381     if FAILED(swf_WriteSWF(f,&newswf)) fprintf(stderr,"WriteSWF() failed.\n");
 382     close(f);
 383
 384     swf_FreeTags(&newswf);                       // cleanup
 385 }
 386
 387 int isOfType(int t, TAG*tag)
 388 {
 389     int show = 0;
 390     if(t == 0 && (tag->id == ST_DEFINESHAPE ||
 391         tag->id == ST_DEFINESHAPE2 ||
 392         tag->id == ST_DEFINESHAPE3)) {
 393         show = 1;
 394     }
 395     if(t==1 && tag->id == ST_DEFINESPRITE) {
 396         show = 1;
 397     }
 398     if(t == 2 && (tag->id == ST_DEFINEBITS ||
 399         tag->id == ST_DEFINEBITSJPEG2 ||
 400         tag->id == ST_DEFINEBITSJPEG3)) {
 401         show = 1;
 402     }
 403     if(t == 3 && (tag->id == ST_DEFINEBITSLOSSLESS ||
 404         tag->id == ST_DEFINEBITSLOSSLESS2)) {
 405         show = 1;
 406     }
 407     if(t == 4 && (tag->id == ST_DEFINESOUND)) {
 408         show = 1;
 409     }
 410     if(t == 5 && (tag->id == ST_DEFINEFONT || tag->id == ST_DEFINEFONT2)) {
 411         show = 1;
 412     }
 413     return show;
 414 }
 415
 416 void listObjects(SWF*swf)
 417 {
 418     TAG*tag;
 419     char first;
 420     int t;
 421     int frame = 0;
 422     char*names[] = {"Shape", "MovieClip", "JPEG", "PNG", "Sound", "Font"};
 423     printf("Objects in file %s:\n",filename);
 424     swf_FoldAll(swf);
 425     for(t=0;t<sizeof(names)/sizeof(names[0]);t++) {
 426         int nr=0;
 427         int lastid = -2, lastprint=-1;
 428         int follow=0;
 429         tag = swf->firstTag;
 430         first = 1;
 431         while(tag) {
 432             if(isOfType(t,tag))
 433                 nr++;
 434             tag = tag->next;
 435         }
 436         if(!nr)
 437             continue;
 438
 439         printf(" %d %s%s: ID(s) ", nr, names[t], nr>1?"s":"");
 440
 441         tag = swf->firstTag;
 442         while(tag) {
 443             char text[80];
 444             char show = isOfType(t,tag);
 445             int id;
 446             if(!show) {
 447                 tag = tag->next;
 448                 continue;
 449             }
 450             id = swf_GetDefineID(tag);
 451
 452             if(id == lastid+1) {
 453                 follow=1;
 454             } else {
 455                 if(first || !follow) {
 456                     if(!first)
 457                         printf(", ");
 458                     printf("%d", id);
 459                 } else {
 460                     if(lastprint + 1 == lastid)
 461                         printf(", %d, %d", lastid, id);
 462                     else
 463                         printf("-%d, %d", lastid, id);
 464                 }
 465                 lastprint = id;
 466                 first = 0;
 467                 follow = 0;
 468             }
 469             lastid = id;
 470             tag=tag->next;
 471         }
 472         if(follow) {
 473             if(lastprint + 1 == lastid)
 474                 printf(", %d", lastid);
 475             else
 476                 printf("-%d", lastid);
 477         }
 478         printf("\n");
 479     }
 480
 481     if(frame)
 482         printf(" %d Frames: ID(s) 0-%d\n", frame, frame);
 483     else
 484         printf(" 1 Frame: ID(s) 0\n");
 485 }
 486
 487 void handlefont(SWF*swf, TAG*tag)
 488 {
 489     SWFFONT* f=0;
 490     U16 id;
 491     char name[80];
 492     char*filename = name;
 493     int t;
 494
 495     id = swf_GetDefineID(tag);
 496     sprintf(name, "font%d.swf", id);
 497     if(numextracts==1) {
 498         filename = destfilename;
 499     }
 500
 501     swf_FontExtract(swf, id, &f);
 502     if(!f) {
 503         printf("Couldn't extract font %d\n", id);
 504         return;
 505     }
 506     if(!f->layout)
 507         swf_FontCreateLayout(f);
 508
 509     swf_WriteFont(f, filename);
 510     swf_FontFree(f);
 511 }
 512
 513 U8*jpegtables = 0;
 514 int jpegtablessize;
 515
 516 void handlejpegtables(TAG*tag)
 517 {
 518     if(tag->id == ST_JPEGTABLES) {
 519         jpegtables = tag->data;
 520         jpegtablessize = tag->len;
 521     }
 522 }
 523
 524 FILE* save_fopen(char* name, char* mode)
 525 {
 526     FILE*fi = fopen(name, mode);
 527     if(!fi) {
 528         fprintf(stderr, "Error: Couldn't open %s\n", name);
 529         exit(1);
 530     }
 531     return fi;
 532 }
 533
 534 int findjpegboundary(U8*data, int len)
 535 {
 536     int t;
 537     int pos=-1;
 538     for(t=0;t<len;t++) {
 539         if(data[t  ]==0xff &&
 540            data[t+1]==0xd9 &&
 541            data[t+2]==0xff &&
 542            data[t+3]==0xd8) {
 543             pos = t;
 544         }
 545     }
 546     return pos;
 547 }
 548
 549 /* extract jpeg data out of a tag */
 550 void handlejpeg(TAG*tag)
 551 {
 552     char name[80];
 553     char*filename = name;
 554     FILE*fi;
 555
 556     sprintf(name, "pic%d.jpg", GET16(tag->data));
 557     if(numextracts==1) {
 558         filename = destfilename;
 559         if(!strcmp(filename,"output.swf"))
 560             filename = "output.jpg";
 561     }
 562     /* swf jpeg images have two streams, which both start with ff d8 and
 563        end with ff d9. The following code handles sorting the middle
 564        <ff d9 ff d8> bytes out, so that one stream remains */
 565     if(tag->id == ST_DEFINEBITS && tag->len>2 && jpegtables) {
 566         fi = save_fopen(filename, "wb");
 567         fwrite(jpegtables, 1, jpegtablessize-2, fi); //don't write end tag (ff,d8)
 568         fwrite(&tag->data[2+2], tag->len-2-2, 1, fi); //don't write start tag (ff,d9)
 569         fclose(fi);
 570     }
 571     else if(tag->id == ST_DEFINEBITSJPEG2 && tag->len>2) {
 572         int end = tag->len;
 573         int pos = findjpegboundary(&tag->data[2], tag->len-2);
 574         if(pos<0)
 575             return;
 576         pos+=2;
 577         fi = save_fopen(filename, "wb");
 578         fwrite(&tag->data[2], pos-2, 1, fi);
 579         fwrite(&tag->data[pos+4], end-(pos+4), 1, fi);
 580         fclose(fi);
 581     }
 582     else if(tag->id == ST_DEFINEBITSJPEG3 && tag->len>6) {
 583         U32 end = GET32(&tag->data[2])+6;
 584         int pos = findjpegboundary(&tag->data[6], tag->len-6);
 585         if(pos<0)
 586             return;
 587         pos+=6;
 588         fi = save_fopen(filename, "wb");
 589         fwrite(&tag->data[6], pos-6, 1, fi);
 590         fwrite(&tag->data[pos+4], end-(pos+4), 1, fi);
 591         fclose(fi);
 592     }
 593     else {
 594         int id = GET16(tag->data);
 595         fprintf(stderr, "Object %d is not a JPEG picture!\n",id);
 596         exit(1);
 597     }
 598 }
 599
 600 #ifdef _ZLIB_INCLUDED_
 601 static U32 mycrc32;
 602
 603 static U32*crc32_table = 0;
 604 static void make_crc32_table(void)
 605 {
 606   int t;
 607   if(crc32_table)
 608       return;
 609   crc32_table = (U32*)malloc(1024);
 610
 611   for (t = 0; t < 256; t++) {
 612     U32 c = t;
 613     int s;
 614     for (s = 0; s < 8; s++) {
 615       c = (0xedb88320L*(c&1)) ^ (c >> 1);
 616     }
 617     crc32_table[t] = c;
 618   }
 619 }
 620 static inline void png_write_byte(FILE*fi, U8 byte)
 621 {
 622     fwrite(&byte,1,1,fi);
 623     mycrc32 = crc32_table[(mycrc32 ^ byte) & 0xff] ^ (mycrc32 >> 8);
 624 }
 625 static void png_start_chunk(FILE*fi, char*type, int len)
 626 {
 627     U8 mytype[4]={0,0,0,0};
 628     U32 mylen = REVERSESWAP32(len);
 629     memcpy(mytype,type,strlen(type));
 630     fwrite(&mylen, 4, 1, fi);
 631     mycrc32=0xffffffff;
 632     png_write_byte(fi,mytype[0]);
 633     png_write_byte(fi,mytype[1]);
 634     png_write_byte(fi,mytype[2]);
 635     png_write_byte(fi,mytype[3]);
 636 }
 637 static void png_write_bytes(FILE*fi, U8*bytes, int len)
 638 {
 639     int t;
 640     for(t=0;t<len;t++)
 641         png_write_byte(fi,bytes[t]);
 642 }
 643 static void png_write_dword(FILE*fi, U32 dword)
 644 {
 645     png_write_byte(fi,dword>>24);
 646     png_write_byte(fi,dword>>16);
 647     png_write_byte(fi,dword>>8);
 648     png_write_byte(fi,dword);
 649 }
 650 static void png_end_chunk(FILE*fi)
 651 {
 652     U32 tmp = REVERSESWAP32((mycrc32^0xffffffff));
 653     fwrite(&tmp,4,1,fi);
 654 }
 655
 656
 657 /* extract a lossless image (png) out of a tag
 658    This routine was originally meant to be a one-pager. I just
 659    didn't know png is _that_ much fun. :) -mk
 660  */
 661 void handlelossless(TAG*tag)
 662 {
 663     char name[80];
 664     char*filename = name;
 665     FILE*fi;
 666     int width, height;
 667     int crc;
 668     int id;
 669     int t;
 670     U8 bpp = 1;
 671     U8 format;
 672     U8 tmp;
 673     U8* data=0;
 674     U8* data2=0;
 675     U8* data3=0;
 676     U32 datalen;
 677     U32 datalen2;
 678     U32 datalen3;
 679     U8 head[] = {137,80,78,71,13,10,26,10};
 680     int cols;
 681     char alpha = tag->id == ST_DEFINEBITSLOSSLESS2;
 682     RGBA* palette;
 683     int pos;
 684     int error;
 685     U32 tmp32;
 686
 687     make_crc32_table();
 688
 689     if(tag->id != ST_DEFINEBITSLOSSLESS &&
 690        tag->id != ST_DEFINEBITSLOSSLESS2) {
 691         int id = GET16(tag->data);
 692         fprintf(stderr, "Object %d is not a PNG picture!\n",id);
 693         exit(1);
 694     }
 695
 696     id =swf_GetU16(tag);
 697     format = swf_GetU8(tag);
 698     if(format == 3) bpp = 8;
 699     if(format == 4) bpp = 16;
 700     if(format == 5) bpp = 32;
 701     if(format!=3 && format!=5) {
 702         if(format==4)
 703         fprintf(stderr, "Can't handle 16-bit palette images yet (image %d)\n",id);
 704         else
 705         fprintf(stderr, "Unknown image type %d in image %d\n", format, id);
 706         return;
 707     }
 708     width = swf_GetU16(tag);
 709     height = swf_GetU16(tag);
 710     if(format == 3) cols = swf_GetU8(tag) + 1;
 711 // this is what format means according to the flash specification. (which is
 712 // clearly wrong)
 713 //    if(format == 4) cols = swf_GetU16(tag) + 1;
 714 //    if(format == 5) cols = swf_GetU32(tag) + 1;
 715     else cols = 0;
 716
 717     msg("<verbose> Width %d", width);
 718     msg("<verbose> Height %d", height);
 719     msg("<verbose> Format %d", format);
 720     msg("<verbose> Cols %d", cols);
 721     msg("<verbose> Bpp %d", bpp);
 722
 723     datalen = (width*height*bpp/8+cols*8);
 724     do {
 725         if(data)
 726             free(data);
 727         datalen+=4096;
 728         data = malloc(datalen);
 729         error = uncompress (data, &datalen, &tag->data[tag->pos], tag->len-tag->pos);
 730     } while(error == Z_BUF_ERROR);
 731     if(error != Z_OK) {
 732         fprintf(stderr, "Zlib error %d (image %d)\n", error, id);
 733         return;
 734     }
 735     msg("<verbose> Uncompressed image is %d bytes (%d colormap)", datalen, (3+alpha)*cols);
 736     pos = 0;
 737     datalen2 = datalen;
 738     data2 = malloc(datalen2);
 739     palette = (RGBA*)malloc(cols*sizeof(RGBA));
 740
 741     for(t=0;t<cols;t++) {
 742         palette[t].r = data[pos++];
 743         palette[t].g = data[pos++];
 744         palette[t].b = data[pos++];
 745         if(alpha) {
 746             palette[t].a = data[pos++];
 747         }
 748     }
 749
 750     sprintf(name, "pic%d.png", id);
 751     if(numextracts==1) {
 752         filename = destfilename;
 753         if(!strcmp(filename,"output.swf"))
 754             filename = "output.png";
 755     }
 756     fi = save_fopen(filename, "wb");
 757     fwrite(head,sizeof(head),1,fi);
 758
 759     png_start_chunk(fi, "IHDR", 13);
 760      png_write_dword(fi,width);
 761      png_write_dword(fi,height);
 762      png_write_byte(fi,8);
 763      if(format == 3)
 764      png_write_byte(fi,3); //indexed
 765      else if(format == 5 && alpha==0)
 766      png_write_byte(fi,2); //rgb
 767      else if(format == 5 && alpha==1)
 768      png_write_byte(fi,6); //rgba
 769      else return;
 770
 771      png_write_byte(fi,0); //compression mode
 772      png_write_byte(fi,0); //filter mode
 773      png_write_byte(fi,0); //interlace mode
 774     png_end_chunk(fi);
 775
 776     if(format == 3) {
 777         png_start_chunk(fi, "PLTE", 768);
 778
 779          for(t=0;t<256;t++) {
 780              png_write_byte(fi,palette[t].r);
 781              png_write_byte(fi,palette[t].g);
 782              png_write_byte(fi,palette[t].b);
 783          }
 784         png_end_chunk(fi);
 785     }
 786     {
 787         int pos2 = 0;
 788         int x,y;
 789         int srcwidth = width * (bpp/8);
 790         datalen3 = width*height*4;
 791         data3 = (U8*)malloc(datalen3);
 792         for(y=0;y<height;y++)
 793         {
 794            data3[pos2++]=0; //filter type
 795            if(bpp==32) {
 796             if(!alpha) {
 797                 // 32 bit to 24 bit "conversion"
 798                 for(x=0;x<width;x++) {
 799                     data3[pos2++]=data[pos+1];
 800                     data3[pos2++]=data[pos+2];
 801                     data3[pos2++]=data[pos+3];
 802                     pos+=4; //ignore padding byte
 803                 }
 804             } else {
 805                 for(x=0;x<width;x++) {
 806                     data3[pos2++]=data[pos+1];
 807                     data3[pos2++]=data[pos+2];
 808                     data3[pos2++]=data[pos+3];
 809                     data3[pos2++]=data[pos+0]; //alpha
 810                     pos+=4;
 811                 }
 812             }
 813            }
 814            else {
 815                 for(x=0;x<srcwidth;x++)
 816                     data3[pos2++]=data[pos++];
 817            }
 818
 819            pos+=((srcwidth+3)&~3)-srcwidth; //align
 820         }
 821         datalen3=pos2;
 822     }
 823
 824     if(compress (data2, &datalen2, data3, datalen3) != Z_OK) {
 825         fprintf(stderr, "zlib error in pic %d\n", id);
 826         return;
 827     }
 828     msg("<verbose> Compressed data is %d bytes", datalen2);
 829     png_start_chunk(fi, "IDAT", datalen2);
 830     png_write_bytes(fi,data2,datalen2);
 831     png_end_chunk(fi);
 832     png_start_chunk(fi, "IEND", 0);
 833     png_end_chunk(fi);
 834
 835     free(data);
 836     free(data2);
 837     free(data3);
 838 }
 839 #endif
 840
 841 FILE*mp3file;
 842 void handlesoundstream(TAG*tag)
 843 {
 844     char*filename = "output.mp3";
 845     if(numextracts==1) {
 846         filename = destfilename;
 847         if(!strcmp(filename,"output.swf"))
 848             filename = "output.mp3";
 849     }
 850     switch(tag->id) {
 851         case ST_SOUNDSTREAMHEAD:
 852             if((tag->data[1]&0x30) == 0x20) { //mp3 compression
 853                 mp3file = fopen(filename, "wb");
 854                 msg("<notice> Writing mp3 data to %s",filename);
 855             }
 856             else
 857                 msg("<error> Soundstream is not mp3");
 858         break;
 859         case ST_SOUNDSTREAMHEAD2:
 860             if((tag->data[1]&0x30) == 0x20) {//mp3 compression
 861                 mp3file = fopen(filename, "wb");
 862                 msg("<notice> Writing mp3 data to %s",filename);
 863             }
 864             else
 865                 msg("<error> Soundstream is not mp3 (2)");
 866         break;
 867         case ST_SOUNDSTREAMBLOCK:
 868             if(mp3file)
 869                 fwrite(&tag->data[4],tag->len-4,1,mp3file);
 870         break;
 871     }
 872 }
 873
 874 void handledefinesound(TAG*tag)
 875 {
 876     U8 flags;
 877     U32 samples;
 878     char buf[128];
 879     char*filename = buf;
 880     FILE*fi;
 881     char*extension = 0;
 882     int format;
 883     U16 id;
 884     int rate,bits,stereo;
 885     char*rates[] = {"5500","11025","22050","44100"};
 886     id = swf_GetU16(tag); //id
 887
 888     flags = swf_GetU8(tag);
 889     format = flags>>4;
 890     rate = (flags>>2)&3;
 891     bits = flags&2?16:8;
 892     stereo = flags&1;
 893
 894     samples = swf_GetU32(tag);
 895
 896     extension = "raw";
 897
 898     if(format == 2) { // mp3
 899         swf_GetU16(tag); //numsamples_seek
 900         extension = "mp3";
 901     } else if(format == 0) { // raw
 902         printf("Sound is RAW, format: %s samples/sec, %d bit, %s\n", rates[rate], bits, stereo?"stereo":"mono");
 903         // TODO: convert to WAV
 904         extension = "raw";
 905     } else if(format == 1) { // adpcm
 906         printf("Sound is ADPCM, format: %s samples/sec, %d bit, %s\n", rates[rate], bits, stereo?"stereo":"mono");
 907         extension = "adpcm";
 908     }
 909     sprintf(buf, "sound%d.%s", id, extension);
 910     if(numextracts==1) {
 911         filename = destfilename;
 912         if(!strcmp(filename,"output.swf")) {
 913             sprintf(buf, "output.%s", extension);
 914             filename = buf;
 915         }
 916     }
 917     fi = save_fopen(filename, "wb");
 918     fwrite(&tag->data[tag->pos], tag->len - tag->pos, 1, fi);
 919     fclose(fi);
 920 }
 921
 922 int main (int argc,char ** argv)
 923 {
 924     TAG*tag;
 925     SWF swf;
 926     int f;
 927     int found = 0;
 928     int frame = 0;
 929     int tagnum = 0;
 930     char depths[65536];
 931     char listavailable = 0;
 932     processargs(argc, argv);
 933
 934     if(!extractframes && !extractids && ! extractname && !extractjpegids && !extractpngids
 935         && !extractmp3 && !extractsoundids && !extractfontids)
 936         listavailable = 1;
 937
 938     if(!filename)
 939     {
 940         fprintf(stderr, "You must supply a filename.\n");
 941         return 1;
 942     }
 943     initLog(0,-1,0,0,-1, verbose);
 944
 945     f = open(filename,O_RDONLY|O_BINARY);
 946
 947     if (f<0)
 948     {
 949         perror("Couldn't open file: ");
 950         exit(1);
 951     }
 952     if (swf_ReadSWF(f,&swf) < 0)
 953     {
 954         fprintf(stderr, "%s is not a valid SWF file or contains errors.\n",filename);
 955         close(f);
 956         exit(1);
 957     }
 958     close(f);
 959
 960     if(listavailable) {
 961         listObjects(&swf);
 962         swf_FreeTags(&swf);
 963         return 0;
 964     }
 965
 966     tag = swf.firstTag;
 967     tagnum = 0;
 968     while(tag) {
 969         tagnum ++;
 970         tag = tag->next;
 971     }
 972
 973     tagused = (char*)malloc(tagnum);
 974     memset(tagused, 0, tagnum);
 975     memset(used, 0, 65536);
 976     memset(depths, 0, 65536);
 977
 978     tag = swf.firstTag;
 979     tagnum = 0;
 980     while(tag) {
 981         if(swf_isAllowedSpriteTag(tag)) {
 982             int write = 0;
 983             if(extractframes && is_in_range(frame, extractframes)) {
 984                 write = 1;
 985                 if(tag->id == ST_PLACEOBJECT || tag->id == ST_PLACEOBJECT2) {
 986                     depths[swf_GetDepth(tag)] = 1;
 987                 }
 988                 if(tag->id == ST_REMOVEOBJECT || tag->id == ST_REMOVEOBJECT2) {
 989                     int depth = swf_GetDepth(tag);
 990                     if(!depths[depth])
 991                         write = 0;
 992                     depths[swf_GetDepth(tag)] = 0;
 993                 }
 994             } else {
 995                 if((tag->id == ST_REMOVEOBJECT || tag->id == ST_REMOVEOBJECT2) &&
 996                     (depths[swf_GetDepth(tag)]) && hollow) {
 997                     write = 1;
 998                     depths[swf_GetDepth(tag)] = 0;
 999                 }
1000             }
1001             if(write) {
1002                 enumerateIDs(tag, idcallback);
1003                 found = 1;
1004                 tagused[tagnum] = 1;
1005             }
1006         }
1007
1008         if(tag->id == ST_SOUNDSTREAMHEAD ||
1009            tag->id == ST_SOUNDSTREAMHEAD2 ||
1010            tag->id == ST_SOUNDSTREAMBLOCK) {
1011             if(extractmp3)
1012                 handlesoundstream(tag);
1013         }
1014
1015         if(tag->id == ST_JPEGTABLES)
1016             handlejpegtables(tag);
1017
1018         if(swf_isDefiningTag(tag)) {
1019             int id = swf_GetDefineID(tag);
1020             tags[id] = tag;
1021             if(extractids && is_in_range(id, extractids)) {
1022                 used[id] = 5;
1023                 found = 1;
1024             }
1025             if(extractfontids && is_in_range(id, extractfontids)) {
1026                 handlefont(&swf, tag);
1027             }
1028             if(extractjpegids && is_in_range(id, extractjpegids)) {
1029                 handlejpeg(tag);
1030             }
1031             if(extractsoundids && is_in_range(id, extractsoundids)) {
1032                 handledefinesound(tag);
1033             }
1034 #ifdef _ZLIB_INCLUDED_
1035             if(extractpngids && is_in_range(id, extractpngids)) {
1036                 handlelossless(tag);
1037             }
1038 #endif
1039         }
1040         else if (tag->id == ST_SETBACKGROUNDCOLOR) {
1041             mainr = tag->data[0];
1042             maing = tag->data[1];
1043             mainb = tag->data[2];
1044         }
1045         else if(tag->id == ST_PLACEOBJECT2) {
1046             char*name = swf_GetName(tag);
1047             if(name && extractname && !strcmp(name, extractname)) {
1048                 int id = swf_GetPlaceID(tag);
1049                 used[id] = 5;
1050                 found = 1;
1051                 tagused[tagnum] = 1;
1052                 depths[swf_GetDepth(tag)] = 1;
1053                 extractname_id = id;
1054             }
1055         }
1056         else if(tag->id == ST_SHOWFRAME) {
1057             frame ++;
1058             if(hollow) {
1059                 tagused[tagnum] = 1;
1060                 found = 1;
1061             }
1062         }
1063
1064         if(tag->id == ST_DEFINESPRITE) {
1065             while(tag->id != ST_END) {
1066                 tag = tag->next;
1067                 tagnum ++;
1068             }
1069         }
1070         tag = tag->next;
1071         tagnum ++;
1072     }
1073     if (found)
1074         extractTag(&swf, destfilename);
1075
1076     if(mp3file)
1077         fclose(mp3file);
1078
1079     swf_FreeTags(&swf);
1080     return 0;
1081 }
1082