X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=lib%2Fmodules%2Fswftools.c;h=e92b44f0c7b7ef65b395c670cb617ffa1870b200;hb=c9d171c9692c7729e4eef7cfb8e6d93970c599c7;hp=1425383271cbf6cebf6cddf0a7ee440d26fa18fd;hpb=faca00b8c7eeee769980e19057a15ea82f52da7a;p=swftools.git

diff --git a/lib/modules/swftools.c b/lib/modules/swftools.c
index 1425383..e92b44f 100644
--- a/lib/modules/swftools.c
+++ b/lib/modules/swftools.c
@@ -119,8 +119,11 @@ U16 swf_GetDefineID(TAG * t)
     case ST_GLYPHNAMES: //pseudodefine
     case ST_VIDEOFRAME: //pseudodefine
     case ST_NAMECHARACTER: //pseudodefine
+    case ST_DOINITACTION: //pseudodefine
       id = swf_GetU16(t);
       break;
+    default:
+      fprintf(stderr, "rfxswf: Error: tag %d (%s) has no id\n", t->id, swf_TagGetName(t));
   }
 
   swf_SetTagPos(t,oldTagPos);
@@ -930,3 +933,123 @@ TAG* swf_Concatenate (TAG*list1,TAG*list2)
 
     return swf1.firstTag;
 }
+
+static int tagHash(TAG*tag)
+{
+    int t, h=0;
+    unsigned int a = 0x6b973e5a;
+    /* start at pos 2, as 0 and 1 are the id */
+    for(t=2;t<tag->len;t++) {
+        unsigned int b = a;
+        a >>= 8;
+        a += tag->data[t]*0xefbc35a5*b*(t+1);
+    }
+    return a;
+}
+
+void swf_Optimize(SWF*swf)
+{
+    const int hash_size = 131072;
+    char* dontremap = malloc(sizeof(char)*65536);
+    U16* remap = malloc(sizeof(U16)*65536);
+    TAG* id2tag = malloc(sizeof(TAG*)*65536);
+    TAG** hashmap = malloc(sizeof(TAG*)*hash_size);
+    TAG* tag;
+    memset(dontremap, 0, sizeof(char)*65536);
+    memset(hashmap, 0, sizeof(TAG*)*hash_size);
+    memset(id2tag, 0, sizeof(TAG*)*65536);
+    int t;
+    for(t=0;t<65536;t++) {
+        remap[t] = t;
+    }
+
+    swf_FoldAll(swf);
+
+    tag = swf->firstTag;
+    while(tag) {
+        /* make sure we don't remap to this tag,
+           as it might have different "helper tags" 
+           FIXME: a better way would be to compare
+                  the helper tags, too.
+         */
+        if(swf_isPseudoDefiningTag(tag)) {
+            //dontremap[swf_GetDefineID(tag)] = 1; //FIXME
+        }
+        tag=tag->next;
+    }
+    tag = swf->firstTag;
+    while(tag) {
+        int doremap=1;
+        
+        TAG*next = tag->next;
+        
+        if(swf_isDefiningTag(tag)) {
+            TAG*tag2;
+            int id = swf_GetDefineID(tag);
+            int hash = tagHash(tag);
+            int match=0;
+            if(!dontremap[id]) 
+            while((tag2 = hashmap[hash%hash_size])) {
+                if(tag2 != (TAG*)(-1) && tag->len == tag2->len) {
+                    int t;
+                    /* start at pos 2, as 0 and 1 are the id */
+                    for(t=2;t<tag->len;t++) {
+                        if(tag->data[t] != tag2->data[t])
+                            break;
+                    }
+                    if(t == tag->len) {
+                        match=1;
+                    }
+                }
+                if(match) {
+                    /* we found two identical tags- remap one
+                       of them */
+                    remap[id] = swf_GetDefineID(tag2);
+                    break;
+                }
+                hash++;
+            }
+            if(!match) {
+                while(hashmap[hash%hash_size]) hash++;
+                hashmap[hash%hash_size] = tag;
+            } else {
+                swf_DeleteTag(tag);
+                if(tag == swf->firstTag)
+                    swf->firstTag = next;
+                doremap = 0;
+            }
+        } else if(swf_isPseudoDefiningTag(tag)) {
+            int id = swf_GetDefineID(tag);
+            if(remap[id]!=id) {
+                /* if this tag was remapped, we don't
+                   need the helper tag anymore. Discard
+                   it. */
+                swf_DeleteTag(tag);
+                if(tag == swf->firstTag)
+                    swf->firstTag = next;
+                doremap = 0;
+            }
+        }
+
+        if(doremap)
+        {
+            int num = swf_GetNumUsedIDs(tag);
+            int*positions = malloc(sizeof(int)*num);
+            int t;
+            swf_GetUsedIDs(tag, positions);
+            for(t=0;t<num;t++) {
+                int id = GET16(&tag->data[positions[t]]);
+                id = remap[id];
+                PUT16(&tag->data[positions[t]], id);
+            }
+            free(positions);
+            tag = tag->next;
+        }
+
+        tag = next;
+    }
+    free(dontremap);
+    free(remap);
+    free(id2tag);
+    free(hashmap);
+}