1 /* vi: set sts=2 sw=2 :*/
5 Library for creating and reading SWF files or parts of it.
6 There's a module directory which provides some extended functionality.
7 Most modules are included at the bottom of this file.
9 Part of the swftools package.
11 Copyright (c) 2000, 2001 Rainer Böhme <rfxswf@reflex-studio.de>
13 This file is distributed under the GPL, see file COPYING for details
23 #define _JPEGLIB_INCLUDED_
24 #endif // HAVE_JPEGLIB_H
25 #endif // HAVE_LIBJPEG
30 #define _ZLIB_INCLUDED_
35 #include "lame/lame.h"
41 #define MALLOC_SIZE 128
42 #define INSERT_RFX_TAG
44 #define MEMSIZE(l) (((l/MALLOC_SIZE)+1)*MALLOC_SIZE)
47 // inline wrapper functions
49 TAG * swf_NextTag(TAG * t) { return t->next; }
50 TAG * swf_PrevTag(TAG * t) { return t->prev; }
51 int swf_GetFrameNo(TAG * t) { return t->frame; }
52 U16 swf_GetTagID(TAG * t) { return t->id; }
53 U32 swf_GetTagLen(TAG * t) { return t->len; }
54 U8* swf_GetTagLenPtr(TAG * t) { return &(t->data[t->len]); }
55 U32 swf_GetTagPos(TAG * t) { return t->pos; }
57 // Basic Data Access Functions
59 #define swf_ResetReadBits(tag) if (tag->readBit) { tag->pos++; tag->readBit = 0; }
60 #define swf_ResetWriteBits(tag) if (tag->writeBit) { tag->writeBit = 0; }
62 // for future purpose: avoid high level lib functions to change tagpos/bitpos
64 #define swf_SaveTagPos(tag)
65 #define swf_RestoreTagPos(tag)
67 void swf_SetTagPos(TAG * t,U32 pos)
68 { swf_ResetReadBits(t);
69 if (pos<=t->len) t->pos = pos;
71 else fprintf(stderr,"SetTagPos() out of bounds: TagID = %i\n",t->id);
76 { swf_ResetReadBits(t);
79 { fprintf(stderr,"GetU8() out of bounds: TagID = %i\n",t->id);
83 return t->data[t->pos++];
86 U16 swf_GetU16(TAG * t)
90 if (t->pos>(t->len-2))
91 { fprintf(stderr,"GetU16() out of bounds: TagID = %i\n",t->id);
95 res = t->data[t->pos] | (t->data[t->pos+1]<<8);
100 U32 swf_GetU32(TAG * t)
102 swf_ResetReadBits(t);
104 if (t->pos>(t->len-4))
105 { fprintf(stderr,"GetU32() out of bounds: TagID = %i\n",t->id);
109 res = t->data[t->pos] | (t->data[t->pos+1]<<8) |
110 (t->data[t->pos+2]<<16) | (t->data[t->pos+3]<<24);
115 int swf_GetBlock(TAG * t,U8 * b,int l)
116 // returns number of bytes written (<=l)
117 // b = NULL -> skip data
118 { swf_ResetReadBits(t);
119 if ((t->len-t->pos)<l) l=t->len-t->pos;
120 if (b && l) memcpy(b,&t->data[t->pos],l);
125 int swf_SetBlock(TAG * t,U8 * b,int l)
126 // Appends Block to the end of Tagdata, returns size
127 { U32 newlen = t->len + l;
128 swf_ResetWriteBits(t);
129 if (newlen>t->memsize)
130 { U32 newmem = MEMSIZE(newlen);
131 U8 * newdata = (U8*)((t->data)?realloc(t->data,newmem):malloc(newmem));
135 fprintf(stderr,"Fatal Error: malloc()/realloc() failed (1). (%d bytes)\n", newmem);
143 if (b) memcpy(&t->data[t->len],b,l);
144 else memset(&t->data[t->len],0x00,l);
149 int swf_SetU8(TAG * t,U8 v)
150 { swf_ResetWriteBits(t);
151 if ((t->len+1)>t->memsize) return (swf_SetBlock(t,&v,1)==1)?0:-1;
152 t->data[t->len++] = v;
156 int swf_SetU16(TAG * t,U16 v)
161 swf_ResetWriteBits(t);
162 if ((t->len+2)>t->memsize) return (swf_SetBlock(t,a,2)==2)?0:-1;
163 t->data[t->len++] = a[0];
164 t->data[t->len++] = a[1];
168 int swf_SetU32(TAG * t,U32 v)
170 a[0] = v&0xff; // to ensure correct handling of non-intel byteorder
175 swf_ResetWriteBits(t);
176 if ((t->len+4)>t->memsize) return (swf_SetBlock(t,a,4)==4)?0:-1;
177 t->data[t->len++] = a[0];
178 t->data[t->len++] = a[1];
179 t->data[t->len++] = a[2];
180 t->data[t->len++] = a[3];
184 U32 swf_GetBits(TAG * t,int nbits)
186 if (!nbits) return 0;
187 if (!t->readBit) t->readBit = 0x80;
190 if (t->data[t->pos]&t->readBit) res|=1;
194 { if (nbits) t->readBit = 0x80;
197 { fprintf(stderr,"GetBits() out of bounds: TagID = %i\n",t->id);
207 S32 swf_GetSBits(TAG * t,int nbits)
208 { U32 res = swf_GetBits(t,nbits);
209 if (res&(1<<(nbits-1))) res|=(0xffffffff<<nbits);
213 U32 reader_GetBits(struct reader_t*reader, int nbits)
214 { return reader_readbits(reader, nbits);
216 S32 reader_GetSBits(struct reader_t*reader, int nbits)
217 { U32 res = reader_readbits(reader, nbits);
218 if (res&(1<<(nbits-1))) res|=(0xffffffff<<nbits);
222 int swf_SetBits(TAG * t,U32 v,int nbits)
223 { U32 bm = 1<<(nbits-1);
227 { if (FAILED(swf_SetU8(t,0))) return -1;
230 if (v&bm) t->data[t->len-1] |= t->writeBit;
238 // Advanced Data Access Functions
240 int swf_SetRGB(TAG * t,RGBA * col)
243 { swf_SetU8(t,col->r);
246 } else swf_SetBlock(t,NULL,3);
249 void swf_GetRGB(TAG * t, RGBA * col)
254 col->r = swf_GetU8(t);
255 col->g = swf_GetU8(t);
256 col->b = swf_GetU8(t);
260 int swf_SetRGBA(TAG * t,RGBA * col)
263 { swf_SetU8(t,col->r);
267 } else swf_SetBlock(t,NULL,4);
270 void swf_GetRGBA(TAG * t, RGBA * col)
275 col->r = swf_GetU8(t);
276 col->g = swf_GetU8(t);
277 col->b = swf_GetU8(t);
278 col->a = swf_GetU8(t);
281 void swf_GetGradient(TAG * tag, GRADIENT * gradient, char alpha)
287 gradient->num = swf_GetU8(tag);
288 for(t=0;t<gradient->num;t++)
293 gradient->ratios[t] = swf_GetU8(tag);
295 swf_GetRGB(tag, &gradient->rgba[t]);
297 swf_GetRGBA(tag, &gradient->rgba[t]);
301 int swf_CountBits(U32 v,int nbits)
319 return (n>nbits)?n:nbits;
322 int swf_GetRect(TAG * t,SRECT * r)
326 nbits = (int) swf_GetBits(t,5);
327 r->xmin = swf_GetSBits(t,nbits);
328 r->xmax = swf_GetSBits(t,nbits);
329 r->ymin = swf_GetSBits(t,nbits);
330 r->ymax = swf_GetSBits(t,nbits);
334 int reader_GetRect(struct reader_t*reader,SRECT * r)
338 nbits = (int) reader_GetBits(reader,5);
339 r->xmin = reader_GetSBits(reader,nbits);
340 r->xmax = reader_GetSBits(reader,nbits);
341 r->ymin = reader_GetSBits(reader,nbits);
342 r->ymax = reader_GetSBits(reader,nbits);
346 int swf_SetRect(TAG * t,SRECT * r)
349 nbits = swf_CountBits(r->xmin,0);
350 nbits = swf_CountBits(r->xmax,nbits);
351 nbits = swf_CountBits(r->ymin,nbits);
352 nbits = swf_CountBits(r->ymax,nbits);
354 fprintf(stderr, "rfxswf: Warning: num_bits overflow in swf_SetRect\n");
358 swf_SetBits(t,nbits,5);
359 swf_SetBits(t,r->xmin,nbits);
360 swf_SetBits(t,r->xmax,nbits);
361 swf_SetBits(t,r->ymin,nbits);
362 swf_SetBits(t,r->ymax,nbits);
367 int swf_GetMatrix(TAG * t,MATRIX * m)
374 { m->sx = m->sy = 0x10000;
380 swf_ResetReadBits(t);
382 if (swf_GetBits(t,1))
383 { nbits = swf_GetBits(t,5);
384 m->sx = swf_GetSBits(t,nbits);
385 m->sy = swf_GetSBits(t,nbits);
387 else m->sx = m->sy = 0x10000;
389 if (swf_GetBits(t,1))
390 { nbits = swf_GetBits(t,5);
391 m->r0 = swf_GetSBits(t,nbits);
392 m->r1 = swf_GetSBits(t,nbits);
394 else m->r0 = m->r1 = 0x0;
396 nbits = swf_GetBits(t,5);
397 m->tx = swf_GetSBits(t,nbits);
398 m->ty = swf_GetSBits(t,nbits);
403 int swf_SetMatrix(TAG * t,MATRIX * m)
409 ma.sx = ma.sy = 0x10000;
414 swf_ResetWriteBits(t);
416 if ((m->sx==0x10000)&&(m->sy==0x10000)) swf_SetBits(t,0,1);
418 { swf_SetBits(t,1,1);
419 nbits = swf_CountBits(m->sx,0);
420 nbits = swf_CountBits(m->sy,nbits);
422 fprintf(stderr,"rfxswf: Error: matrix values too large\n");
425 swf_SetBits(t,nbits,5);
426 swf_SetBits(t,m->sx,nbits);
427 swf_SetBits(t,m->sy,nbits);
430 if ((!m->r0)&&(!m->r1)) swf_SetBits(t,0,1);
432 { swf_SetBits(t,1,1);
433 nbits = swf_CountBits(m->r0,0);
434 nbits = swf_CountBits(m->r1,nbits);
436 fprintf(stderr,"rfxswf: Error: matrix values too large\n");
439 swf_SetBits(t,nbits,5);
440 swf_SetBits(t,m->r0,nbits);
441 swf_SetBits(t,m->r1,nbits);
444 nbits = swf_CountBits(m->tx,0);
445 nbits = swf_CountBits(m->ty,nbits);
447 fprintf(stderr,"rfxswf: Error: matrix values too large\n");
450 swf_SetBits(t,nbits,5);
451 swf_SetBits(t,m->tx,nbits);
452 swf_SetBits(t,m->ty,nbits);
457 int swf_GetCXForm(TAG * t,CXFORM * cx,U8 alpha) //FIXME: alpha should be type bool
465 cx->a0 = cx->r0 = cx->g0 = cx->b0 = 256;
466 cx->a1 = cx->r1 = cx->g1 = cx->b1 = 0;
470 swf_ResetReadBits(t);
471 hasadd = swf_GetBits(t,1);
472 hasmul = swf_GetBits(t,1);
473 nbits = swf_GetBits(t,4);
476 { cx->r0 = (S16)swf_GetSBits(t,nbits);
477 cx->g0 = (S16)swf_GetSBits(t,nbits);
478 cx->b0 = (S16)swf_GetSBits(t,nbits);
480 cx->a0 = (S16)swf_GetSBits(t,nbits);
484 { cx->r1 = (S16)swf_GetSBits(t,nbits);
485 cx->g1 = (S16)swf_GetSBits(t,nbits);
486 cx->b1 = (S16)swf_GetSBits(t,nbits);
488 cx->a1 = (S16)swf_GetSBits(t,nbits);
494 int swf_SetCXForm(TAG * t,CXFORM * cx,U8 alpha)
502 cx->a0 = cx->r0 = cx->g0 = cx->b0 = 256;
503 cx->a1 = cx->r1 = cx->g1 = cx->b1 = 0;
513 hasmul = (cx->a0!=256)||(cx->r0!=256)||(cx->g0!=256)||(cx->b0!=256);
514 hasadd = cx->a1|cx->r1|cx->g1|cx->b1;
517 { if (alpha) nbits = swf_CountBits((S32)cx->a0,nbits);
518 nbits = swf_CountBits((S32)cx->r0,nbits);
519 nbits = swf_CountBits((S32)cx->g0,nbits);
520 nbits = swf_CountBits((S32)cx->b0,nbits);
524 { if (alpha) nbits = swf_CountBits((S32)cx->a1,nbits);
525 nbits = swf_CountBits((S32)cx->r1,nbits);
526 nbits = swf_CountBits((S32)cx->g1,nbits);
527 nbits = swf_CountBits((S32)cx->b1,nbits);
530 swf_ResetWriteBits(t);
531 swf_SetBits(t,hasadd?1:0,1);
532 swf_SetBits(t,hasmul?1:0,1);
533 swf_SetBits(t,nbits,4);
536 { swf_SetBits(t,cx->r0,nbits);
537 swf_SetBits(t,cx->g0,nbits);
538 swf_SetBits(t,cx->b0,nbits);
539 if (alpha) swf_SetBits(t,cx->a0,nbits);
543 { swf_SetBits(t,cx->r1,nbits);
544 swf_SetBits(t,cx->g1,nbits);
545 swf_SetBits(t,cx->b1,nbits);
546 if (alpha) swf_SetBits(t,cx->a1,nbits);
552 int swf_GetPoint(TAG * t,SPOINT * p) { return 0; }
553 int swf_SetPoint(TAG * t,SPOINT * p) { return 0; }
555 // Tag List Manipulating Functions
557 int swf_UpdateFrame(TAG * t,S8 delta)
558 // returns number of frames
568 TAG * swf_InsertTag(TAG * after,U16 id) // updates frames, if nescessary
571 t = (TAG *)malloc(sizeof(TAG));
573 { memset(t,0x00,sizeof(TAG));
577 { t->frame = after->frame;
579 t->next = after->next;
581 if (t->next) t->next->prev = t;
583 if (id==ST_SHOWFRAME) swf_UpdateFrame(t->next,+1);
589 int swf_DeleteTag(TAG * t)
592 if (t->id==ST_SHOWFRAME) swf_UpdateFrame(t->next,-1);
594 if (t->prev) t->prev->next = t->next;
595 if (t->next) t->next->prev = t->prev;
597 if (t->data) free(t->data);
602 TAG * swf_ReadTag(struct reader_t*reader, TAG * prev)
608 if (reader->read(reader, &raw, 2) !=2 ) return NULL;
616 if (reader->read(reader, &len, 4) != 4) return NULL;
620 if (id==ST_DEFINESPRITE) len = 2*sizeof(U16);
621 // Sprite handling fix: Flaten sprite tree
623 t = (TAG *)malloc(sizeof(TAG));
628 fprintf(stderr,"Fatal Error: malloc()/realloc() failed (2). (%d bytes)\n", sizeof(TAG));
633 memset(t,0x00,sizeof(TAG));
639 { t->data = (U8*)malloc(t->len);
643 fprintf(stderr,"Fatal Error: malloc()/realloc() failed (3). (%d bytes)\n", t->len);
648 if (reader->read(reader, t->data, t->len) != t->len) return NULL;
652 { t->frame = prev->frame+((prev->id==ST_SHOWFRAME)?1:0);
660 int swf_DefineSprite_GetRealSize(TAG * t);
662 int swf_WriteTag2(struct writer_t*writer, TAG * t)
663 // returns tag length in bytes (incl. Header), -1 = Error
664 // writer = 0 -> no output
671 len = (t->id==ST_DEFINESPRITE)?swf_DefineSprite_GetRealSize(t):t->len;
673 short_tag = len<0x3f;
677 { raw[0] = SWAP16(len|((t->id&0x3ff)<<6));
678 if (writer->write(writer,raw,2)!=2)
681 fprintf(stderr,"WriteTag() failed: Short Header.\n");
688 raw[0] = SWAP16((t->id<<6)|0x3f);
689 if (writer->write(writer,raw,2)!=2)
692 fprintf(stderr,"WriteTag() failed: Long Header (1).\n");
698 if (writer->write(writer,&len,4)!=4)
701 fprintf(stderr,"WriteTag() failed: Long Header (2).\n");
708 { if (writer->write(writer,t->data,t->len)!=t->len)
711 fprintf(stderr,"WriteTag() failed: Data.\n");
717 else if (t->len) fprintf(stderr,"WriteTag(): Tag Data Error, id=%i\n",t->id);
721 return t->len+(short_tag?2:6);
724 int swf_WriteTag(int handle, TAG * t)
726 struct writer_t writer;
728 return swf_WriteTag2(0, t);
729 writer_init_filewriter(&writer, handle);
730 return swf_WriteTag2(&writer, t);
733 int swf_DefineSprite_GetRealSize(TAG * t)
734 // Sprite Handling: Helper function to pack DefineSprite-Tag
736 if(len>4) { // folded sprite
740 { t = swf_NextTag(t);
741 if (t->id!=ST_DEFINESPRITE) len += swf_WriteTag(-1, t);
743 } while (t&&(t->id!=ST_END));
747 void swf_FoldSprite(TAG * t)
751 if(t->id!=ST_DEFINESPRITE)
754 fprintf(stderr, "Error: Sprite has no ID!");
758 /* sprite is already folded */
764 //frames = swf_GetU16(t);
766 t->len = t->pos = t->memsize = 0;
773 if(t->id==ST_SHOWFRAME) frames++;
775 } while(t&&t!=ST_END);
777 t = swf_NextTag(sprtag);
778 swf_SetU16(sprtag, id);
779 swf_SetU16(sprtag, frames);
785 swf_SetU16(sprtag,t->len|(t->id<<6));
787 swf_SetU16(sprtag,0x3f|(t->id<<6));
788 swf_SetU32(sprtag,t->len);
791 swf_SetBlock(sprtag,t->data, t->len);
796 while (t&&(tmpid!=ST_END));
802 void swf_FoldAll(SWF*swf)
804 TAG*tag = swf->firstTag;
806 if(tag->id == ST_DEFINESPRITE)
808 tag = swf_NextTag(tag);
814 int swf_ReadSWF2(struct reader_t*reader, SWF * swf) // Reads SWF to memory (malloc'ed), returns length or <0 if fails
817 memset(swf,0x00,sizeof(SWF));
819 { char b[32]; // read Header
823 struct reader_t zreader;
825 if ((len = reader->read(reader ,b,8))<8) return -1;
827 if (b[0]!='F' && b[0]!='C') return -1;
828 if (b[1]!='W') return -1;
829 if (b[2]!='S') return -1;
830 swf->fileVersion = b[3];
831 swf->compressed = (b[0]=='C')?1:0;
832 swf->fileSize = GET32(&b[4]);
834 if(swf->compressed) {
835 reader_init_zlibinflate(&zreader, reader);
839 reader_GetRect(reader, &swf->movieSize);
840 reader->read(reader, &swf->frameRate, 2);
841 swf->frameRate = SWAP16(swf->frameRate);
842 reader->read(reader, &swf->frameCount, 2);
843 swf->frameCount = SWAP16(swf->frameCount);
845 /* read tags and connect to list */
847 while (t) t = swf_ReadTag(reader,t);
848 swf->firstTag = t1.next;
849 t1.next->prev = NULL;
855 int swf_ReadSWF(int handle, SWF * swf)
857 struct reader_t reader;
858 reader_init_filereader(&reader, handle);
859 return swf_ReadSWF2(&reader, swf);
862 int swf_WriteSWF2(struct writer_t*writer, SWF * swf) // Writes SWF to file, returns length or <0 if fails
866 struct writer_t zwriter;
873 #ifdef INSERT_RFX_TAG
875 if (swf->firstTag && swf_NextTag(swf->firstTag))
876 if (swf_GetTagID(swf_NextTag(swf->firstTag))!=ST_REFLEX)
877 swf_SetBlock(swf_InsertTag(swf->firstTag,ST_REFLEX),"rfx",3);
879 #endif // INSERT_RFX_TAG
881 // Count Frames + File Size
888 { len += swf_WriteTag(-1, t);
889 if (t->id==ST_SHOWFRAME) frameCount++;
897 memset(&t1,0x00,sizeof(TAG));
901 { // measure header file size
904 memset(&t2,0x00,sizeof(TAG));
907 swf_SetRect(&t2, &swf->movieSize);
908 swf_SetU16(&t2, swf->frameRate);
909 swf_SetU16(&t2, swf->frameCount);
910 l = swf_GetTagLen(&t2)+8;
914 if(len) {// don't touch headers without tags
915 swf->fileSize = fileSize;
916 swf->frameCount = frameCount;
919 if(swf->compressed) {
921 writer->write(writer, id, 3);
925 writer->write(writer, id, 3);
928 writer->write(writer, &swf->fileVersion, 1);
929 PUT32(b4, swf->fileSize);
930 writer->write(writer, b4, 4);
932 if(swf->compressed) {
933 writer_init_zlibdeflate(&zwriter, writer);
937 swf_SetRect(&t1,&swf->movieSize);
938 swf_SetU16(&t1,swf->frameRate);
939 swf_SetU16(&t1,swf->frameCount);
943 int ret = writer->write(writer,b,swf_GetTagLen(&t1));
944 if (ret!=swf_GetTagLen(&t1))
947 printf("ret:%d\n",ret);
949 fprintf(stderr,"WriteSWF() failed: Header.\n");
956 { if (swf_WriteTag2(writer, t)<0) return -1;
959 writer->finish(writer); //e.g. flush zlib buffers
962 return (int)fileSize;
965 int swf_WriteSWF(int handle, SWF * swf) // Writes SWF to file, returns length or <0 if fails
967 struct writer_t writer;
970 return swf_WriteSWF2(&writer, swf);
971 writer_init_filewriter(&writer, handle);
972 return swf_WriteSWF2(&writer, swf);
975 int swf_WriteSWC(int handle, SWF * swf) // Writes SWF to file, returns length or <0 if fails
977 struct writer_t writer;
980 return swf_WriteSWF2(&writer, swf);
981 writer_init_filewriter(&writer, handle);
982 return swf_WriteSWF2(&writer, swf);
985 int swf_WriteHeader2(struct writer_t*writer,SWF * swf)
988 memcpy(&myswf,swf,sizeof(SWF));
990 return swf_WriteSWF2(writer, &myswf);
993 int swf_WriteHeader(int handle,SWF * swf)
996 memcpy(&myswf,swf,sizeof(SWF));
998 return swf_WriteSWF(handle, &myswf);
1001 int swf_WriteCGI(SWF * swf)
1005 len = swf_WriteSWF(-1,swf);
1007 if (len<0) return -1;
1009 sprintf(s,"Content-type: application/x-shockwave-flash\n"
1010 "Accept-Ranges: bytes\n"
1011 "Content-Length: %lu\n"
1012 "Expires: Thu, 13 Apr 2000 23:59:59 GMT\n"
1015 write(fileno(stdout),s,strlen(s));
1016 return swf_WriteSWF(fileno(stdout),swf);
1019 void swf_FreeTags(SWF * swf) // Frees all malloc'ed memory for tags
1020 { TAG * t = swf->firstTag;
1023 { TAG * tnew = t->next;
1024 if (t->data) free(t->data);
1030 // include advanced functions
1032 #include "modules/swfdump.c"
1033 #include "modules/swfshape.c"
1034 #include "modules/swftext.c"
1035 #include "modules/swfobject.c"
1036 #include "modules/swfbutton.c"
1037 #include "modules/swftools.c"
1038 #include "modules/swfcgi.c"
1039 #include "modules/swfbits.c"
1040 #include "modules/swfaction.c"
1041 #include "modules/swfsound.c"