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_PLACEOBJECT:
  50             maponeid(&newtag->data[0]);
  51         break;
  52         case TAGID_PLACEOBJECT2:
  53             // only if placeflaghascharacter
  54             if(!(newtag->data[0]&2))
  55                 break;
  56             maponeid(&newtag->data[3]);
  57         break;
  58         case TAGID_REMOVEOBJECT:
  59             maponeid(&newtag->data[0]);
  60         break;
  61         case TAGID_STARTSOUND:
  62             maponeid(&newtag->data[0]);
  63         break;
  64         case TAGID_DEFINESPRITE: {
  65             u8*mem = &newtag->data[4];
  66             int len = newtag->length-4;
  67
  68             while(1) {
  69                 u8*fmem = mem;
  70                 int flen = len;
  71                 struct swf_tag sprtag;
  72
  73                 reader_init (mem, len);
  74                 swf_read_tag (&sprtag);
  75
  76                 mem = getinputpos();
  77                 len = getinputlength();
  78
  79                 if(sprtag.id == TAGID_END)
  80                     break;
  81
  82                 map_ids_mem (fmem,flen);
  83             }
  84         }
  85         break;
  86         case TAGID_DEFINEBUTTON2: // has some font ids in the button records
  87             num++;
  88         //fallthrough
  89         case TAGID_DEFINEBUTTON:
  90             reader_init (newtag->data, newtag->length);
  91             readu16(); //button id
  92             if(num>1)
  93             {
  94                 readu8(); //flag
  95                 readu16(); //offset
  96             }
  97             while(1)
  98             {
  99                 u16 charid;
 100                 if(!readu8()) //flags
 101                     break;
 102                 charid = *(u16*)getinputpos();
 103                 maponeid(getinputpos());
 104                 readu16(); //char
 105                 readu16(); //layer
 106                 readMATRIX();
 107                 readCXFORM();
 108             }
 109             // ...
 110         break;
 111         case TAGID_DEFINEEDITTEXT:  {
 112             u8 flags1,flags2;
 113             reader_init (newtag->data, newtag->length);
 114             readu16(); //id
 115             readRECT(); //bounding box
 116             resetbits();
 117             flags1 = readu8();
 118             flags2 = readu8();
 119             if(flags1 & 128)
 120                 maponeid(getinputpos());
 121         }
 122         break;
 123         case TAGID_DEFINETEXT2:
 124             num ++;
 125         case TAGID_DEFINETEXT: {
 126             int glyphbits, advancebits;
 127             int id;
 128             reader_init (newtag->data, newtag->length);
 129             id = readu16(); //id
 130             readRECT(); //bounding box
 131             readMATRIX(); //matrix
 132             resetbits();
 133             glyphbits = readu8(); //glyphbits
 134             advancebits = readu8(); //advancebits
 135             while(1) {
 136                 u16 flags;
 137                 resetbits();
 138                 flags = getbits(8);
 139                 if(!flags) break;
 140                 if(flags & 128) // text style record
 141                 {
 142                     resetbits();
 143                     if(flags & 8) { // hasfont
 144                         maponeid(getinputpos());
 145                         id = readu16();
 146                     }
 147                     if(flags & 4) { // hascolor
 148                         if(num==1) readRGB();
 149                         else       readRGBA();
 150                     }
 151                     if(flags & 2) { //has x offset
 152                         resetbits();
 153                         readu16();
 154                     }
 155                     if(flags & 1) { //has y offset
 156                         resetbits();
 157                         readu16();
 158                     }
 159                     if(flags & 8) { //has height
 160                         resetbits();
 161                         readu16();
 162                     }
 163                 } else { // glyph record
 164                     int t;
 165                     resetbits();
 166                     for(t=0;t<flags;t++) {
 167                         getbits(glyphbits);
 168                         getbits(advancebits);
 169                     }
 170                 }
 171             }
 172             break;
 173         }
 174         case TAGID_DEFINEFONTINFO:
 175             maponeid(&newtag->data[0]);
 176         break;
 177
 178         case TAGID_DEFINESHAPE3: // these thingies might have bitmap ids in their fillstyles
 179         num++; //fallthrough
 180         case TAGID_DEFINESHAPE2:
 181         num++; //fallthrough
 182         case TAGID_DEFINESHAPE: {
 183             u16 count;
 184             int t;
 185             struct RECT r;
 186             reader_init (newtag->data, newtag->length);
 187             readu16(); // id;
 188             r = readRECT(); // bounds
 189 //          printf("%d shape bounds: %d %d %d %d\n",newtag->id,r.x1,r.y1,r.x2,r.y2);
 190             resetbits();
 191             count = readu8();
 192             if(count == 0xff && num>1)
 193                 count = readu16();
 194 //          printf("%d fillstyles\n", count);
 195             for(t=0;t<count;t++)
 196             {
 197                 int type;
 198                 u8*pos;
 199                 pos=getinputpos();
 200 //              printf("%02x %02x %02x %02x %02x %02x %02x %02x\n",
 201 //                      pos[0],pos[1],pos[2],pos[3],pos[4],pos[5],pos[6],pos[7]);
 202                 type = readu8(); //type
 203 //              printf("fillstyle %d is type 0x%02x\n", t, type);
 204                 if(type == 0) {
 205                     if(num == 3)
 206                         readRGBA();
 207                     else
 208                         readRGB();
 209                 }
 210                 if(type == 0x10 || type == 0x12)
 211                 {
 212                     readMATRIX();
 213                     resetbits();
 214                     readGRADIENT(num);
 215                 }
 216                 if(type == 0x40 || type == 0x41)
 217                 {
 218                     resetbits();
 219                     // we made it.
 220                     if(*(u16*)getinputpos() != 65535)
 221                         maponeid(getinputpos());
 222
 223                     readu16();
 224                     readMATRIX();
 225                 }
 226                 //...
 227             }
 228         }
 229         break;
 230         default:
 231         break;
 232     }
 233 }
 234
 235 static int*bitmap;
 236
 237 static int get_free_id()
 238 {
 239     int t;
 240     for (t=1;t<65536;t++)
 241     {
 242         if(bitmap[t] == -1)
 243         {
 244             bitmap[t] = 1;
 245             return t;
 246         }
 247     }
 248     return -1;
 249 }
 250
 251 void swf_relocate (u8*data, int length, int*_bitmap)
 252 {
 253     int pos;
 254     bitmap = _bitmap;
 255     read_swf(&file, data, length);
 256     memset(slaveids, -1, sizeof(slaveids));
 257
 258     pos = 0;
 259     while(file.tags[pos].id != 0) {
 260         struct swf_tag*tag = &file.tags[pos];
 261
 262         map_ids(&file.tags[pos]);
 263
 264         if(is_defining_tag(tag->id))
 265         {
 266             int newid;
 267             int id;
 268
 269             id = getidfromtag(tag); //own id
 270
 271             if(bitmap[id] < 0) { //free
 272                 newid = id;
 273             }
 274             else {
 275                 newid = get_free_id(id);
 276             }
 277             bitmap[newid] = 1;
 278             slaveids[id] = newid;
 279
 280             logf("<debug> sprite id %d mapped to %d",id, newid);
 281
 282             setidintag(tag, newid);
 283
 284             logf("<debug> [sprite defs] write tag %02x (%d bytes in body)",
 285                     tag->id, tag->length);
 286         }
 287         pos++;
 288     }
 289 }
 290