src/reloc.c

   1 /* reloc.h
   2    Implements swf_relocate(), which changes the id range of a swf file in
   3    memory.
   4
   5    Part of the swftools package.
   6
   7    Copyright (c) 2001 Matthias Kramm <kramm@quiss.org>
   8
   9    This file is distributed under the GPL, see file COPYING for details */
  10
  11 #include "flash.h"
  12
  13 static struct swffile file;
  14
  15 int slaveids[65536];
  16
  17
  18 void map_ids_mem(u8*mem, int length);
  19 static struct swf_tag* map_ids(struct swf_tag*tag)
  20 {
  21     map_ids_mem(tag->fulldata, tag->fulllength);
  22     return tag;
  23 }
  24
  25 void maponeid(void*idpos)
  26 {
  27     u16*idptr = (u16*)idpos;
  28     if(slaveids[*idptr]<0) {
  29         logf("<error> Trying to map id never encountered before: id=%d", *idptr);
  30         return ;
  31     }
  32     logf("<debug> mapping %d to %d", *idptr, slaveids[*idptr]);
  33     *idptr =  slaveids[*idptr];
  34 }
  35
  36
  37 // take a memory region which contains a tag, and
  38 // map the ids inside this tag to new values
  39 void map_ids_mem(u8*mem, int length)
  40 {
  41     int num=1;
  42     struct swf_tag newtag_instance;
  43     struct swf_tag*newtag = &newtag_instance;
  44     reader_init (mem, length);
  45     swf_read_tag(newtag);
  46
  47     switch(newtag->id)
  48     {
  49         case TAGID_DEFINEBUTTONCXFORM: {
  50             int t;
  51             maponeid(&newtag->data[0]); //button id
  52             reader_init (newtag->data, newtag->length);
  53             for(t=0;t<4;t++) {
  54                 int flags;
  55                 maponeid(&newtag->data[0]);
  56                 readu16(); //sound id
  57                 flags = readu8();
  58                 if(flags&1)
  59                     readu32(); // in point
  60                 if(flags&2)
  61                     readu32(); // out points
  62                 if(flags&4)
  63                     readu16(); // loop count
  64                 if(flags&8)
  65                 {
  66                     int npoints = readu8();
  67                     int s;
  68                     for(s=0;s<npoints;s++)
  69                     {
  70                         readu32();
  71                         readu16();
  72                         readu16();
  73                     }
  74                 }
  75             }
  76         } break;
  77         case TAGID_DEFINEBUTTONSOUND:
  78             maponeid(&newtag->data[0]); //button id
  79         break;
  80         case TAGID_PLACEOBJECT:
  81             maponeid(&newtag->data[0]);
  82         break;
  83         case TAGID_PLACEOBJECT2:
  84             // only if placeflaghascharacter
  85             if(!(newtag->data[0]&2))
  86                 break;
  87             maponeid(&newtag->data[3]);
  88         break;
  89         case TAGID_REMOVEOBJECT:
  90             maponeid(&newtag->data[0]);
  91         break;
  92         case TAGID_STARTSOUND:
  93             maponeid(&newtag->data[0]);
  94         break;
  95         case TAGID_DEFINESPRITE: {
  96             u8*mem = &newtag->data[4];
  97             int len = newtag->length-4;
  98
  99             while(1) {
 100                 u8*fmem = mem;
 101                 int flen = len;
 102                 struct swf_tag sprtag;
 103
 104                 reader_init (mem, len);
 105                 swf_read_tag (&sprtag);
 106
 107                 mem = getinputpos();
 108                 len = getinputlength();
 109
 110                 if(sprtag.id == TAGID_END)
 111                     break;
 112
 113                 map_ids_mem (fmem,flen);
 114             }
 115         }
 116         break;
 117         case TAGID_DEFINEBUTTON2: // has some font ids in the button records
 118             num++;
 119         //fallthrough
 120         case TAGID_DEFINEBUTTON:
 121             reader_init (newtag->data, newtag->length);
 122             readu16(); //button id
 123             if(num>1)
 124             {
 125                 readu8(); //flag
 126                 readu16(); //offset
 127             }
 128             while(1)
 129             {
 130                 u16 charid;
 131                 if(!readu8()) //flags
 132                     break;
 133                 charid = *(u16*)getinputpos();
 134                 maponeid(getinputpos());
 135                 readu16(); //char
 136                 readu16(); //layer
 137                 readMATRIX();
 138                 if(num>1)
 139                   readCXFORM();
 140             }
 141             // ...
 142         break;
 143         case TAGID_DEFINEEDITTEXT:  {
 144             u8 flags1,flags2;
 145             reader_init (newtag->data, newtag->length);
 146             readu16(); //id
 147             readRECT(); //bounding box
 148             resetbits();
 149             flags1 = readu8();
 150             flags2 = readu8();
 151             if(flags1 & 128)
 152                 maponeid(getinputpos());
 153         }
 154         break;
 155         case TAGID_DEFINETEXT2:
 156             num ++;
 157         case TAGID_DEFINETEXT: {
 158             int glyphbits, advancebits;
 159             int id;
 160             reader_init (newtag->data, newtag->length);
 161             id = readu16(); //id
 162             readRECT(); //bounding box
 163             readMATRIX(); //matrix
 164             resetbits();
 165             glyphbits = readu8(); //glyphbits
 166             advancebits = readu8(); //advancebits
 167             while(1) {
 168                 u16 flags;
 169                 resetbits();
 170                 flags = getbits(8);
 171                 if(!flags) break;
 172                 if(flags & 128) // text style record
 173                 {
 174                     resetbits();
 175                     if(flags & 8) { // hasfont
 176                         maponeid(getinputpos());
 177                         id = readu16();
 178                     }
 179                     if(flags & 4) { // hascolor
 180                         if(num==1) readRGB();
 181                         else       readRGBA();
 182                     }
 183                     if(flags & 2) { //has x offset
 184                         resetbits();
 185                         readu16();
 186                     }
 187                     if(flags & 1) { //has y offset
 188                         resetbits();
 189                         readu16();
 190                     }
 191                     if(flags & 8) { //has height
 192                         resetbits();
 193                         readu16();
 194                     }
 195                 } else { // glyph record
 196                     int t;
 197                     resetbits();
 198                     for(t=0;t<flags;t++) {
 199                         getbits(glyphbits);
 200                         getbits(advancebits);
 201                     }
 202                 }
 203             }
 204             break;
 205         }
 206         case TAGID_DEFINEFONTINFO:
 207             maponeid(&newtag->data[0]);
 208         break;
 209
 210         case TAGID_DEFINESHAPE3: // these thingies might have bitmap ids in their fillstyles
 211         num++; //fallthrough
 212         case TAGID_DEFINESHAPE2:
 213         num++; //fallthrough
 214         case TAGID_DEFINESHAPE: {
 215             u16 count;
 216             int t;
 217             struct RECT r;
 218             reader_init (newtag->data, newtag->length);
 219             readu16(); // id;
 220             r = readRECT(); // bounds
 221 //          printf("%d shape bounds: %d %d %d %d\n",newtag->id,r.x1,r.y1,r.x2,r.y2);
 222             resetbits();
 223             count = readu8();
 224             if(count == 0xff && num>1) // defineshape2,3 only
 225                 count = readu16();
 226 //          printf("%d fillstyles\n", count);
 227             for(t=0;t<count;t++)
 228             {
 229                 int type;
 230                 u8*pos;
 231                 pos=getinputpos();
 232 //              printf("%02x %02x %02x %02x %02x %02x %02x %02x\n",
 233 //                      pos[0],pos[1],pos[2],pos[3],pos[4],pos[5],pos[6],pos[7]);
 234                 resetbits();
 235                 type = readu8(); //type
 236 //              printf("fillstyle %d is type 0x%02x\n", t, type);
 237                 if(type == 0) {
 238                     if(num == 3)
 239                         readRGBA();
 240                     else
 241                         readRGB();
 242                 }
 243                 if(type == 0x10 || type == 0x12)
 244                 {
 245                     readMATRIX();
 246                     resetbits();
 247                     readGRADIENT(num);
 248                 }
 249                 if(type == 0x40 || type == 0x41)
 250                 {
 251                     resetbits();
 252                     // we made it.
 253                     if(*(u16*)getinputpos() != 65535)
 254                         maponeid(getinputpos());
 255
 256                     readu16();
 257                     readMATRIX();
 258                 }
 259                 //...
 260             }
 261         }
 262         break;
 263         default:
 264         break;
 265     }
 266 }
 267
 268 static int*bitmap;
 269
 270 static int get_free_id()
 271 {
 272     int t;
 273     for (t=1;t<65536;t++)
 274     {
 275         if(bitmap[t] == -1)
 276         {
 277             bitmap[t] = 1;
 278             return t;
 279         }
 280     }
 281     return -1;
 282 }
 283
 284 void swf_relocate (u8*data, int length, int*_bitmap)
 285 {
 286     int pos;
 287     bitmap = _bitmap;
 288     read_swf(&file, data, length);
 289     memset(slaveids, -1, sizeof(slaveids));
 290
 291     pos = 0;
 292     while(file.tags[pos].id != 0) {
 293         struct swf_tag*tag = &file.tags[pos];
 294
 295         logf("<debug> relocator: processing tag %02x", tag->id);
 296         map_ids(&file.tags[pos]);
 297
 298         if(is_defining_tag(tag->id))
 299         {
 300             int newid;
 301             int id;
 302
 303             id = getidfromtag(tag); //own id
 304
 305             if(bitmap[id] < 0) { //free
 306                 newid = id;
 307             }
 308             else {
 309                 newid = get_free_id(id);
 310             }
 311             bitmap[newid] = 1;
 312             slaveids[id] = newid;
 313
 314             logf("<debug> relocator: id %d mapped to %d",id, newid);
 315
 316             setidintag(tag, newid);
 317
 318             logf("<debug> [reloc] write tag %02x (%d bytes in body)",
 319                     tag->id, tag->length);
 320         }
 321         pos++;
 322     }
 323 }
 324