Limit hash table inserts after switch from stored deflate.

madler/zlib@2d80d3f

lib/zlib/deflate.js

@@ -380,6 +380,9 @@ const fill_window = (s) => {
       s.strstart -= _w_size;
       /* we now have strstart >= MAX_DIST */
       s.block_start -= _w_size;
+      if (s.insert > s.strstart) {
+        s.insert = s.strstart;
+      }
       slide_hash(s);
       more += _w_size;
     }
@@ -591,6 +594,7 @@ const deflate_stored = (s, flush) => {
       //zmemcpy(s->window, s->strm->next_in - s->w_size, s->w_size);
       s.window.set(s.strm.input.subarray(s.strm.next_in - s.w_size, s.strm.next_in), 0);
       s.strstart = s.w_size;
+      s.insert = s.strstart;
     }
     else {
       if (s.window_size - s.strstart <= used) {
@@ -601,13 +605,16 @@ const deflate_stored = (s, flush) => {
         if (s.matches < 2) {
           s.matches++;   /* add a pending slide_hash() */
         }
+        if (s.insert > s.strstart) {
+          s.insert = s.strstart;
+        }
       }
       //zmemcpy(s->window + s->strstart, s->strm->next_in - used, used);
       s.window.set(s.strm.input.subarray(s.strm.next_in - used, s.strm.next_in), s.strstart);
       s.strstart += used;
+      s.insert += used > s.w_size - s.insert ? s.w_size - s.insert : used;
     }
     s.block_start = s.strstart;
-    s.insert += used > s.w_size - s.insert ? s.w_size - s.insert : used;
   }
   if (s.high_water < s.strstart) {
     s.high_water = s.strstart;
@@ -636,13 +643,17 @@ const deflate_stored = (s, flush) => {
       s.matches++;       /* add a pending slide_hash() */
     }
     have += s.w_size;      /* more space now */
+    if (s.insert > s.strstart) {
+      s.insert = s.strstart;
+    }
   }
   if (have > s.strm.avail_in) {
     have = s.strm.avail_in;
   }
   if (have) {
     read_buf(s.strm, s.window, s.strstart, have);
     s.strstart += have;
+    s.insert += have > s.w_size - s.insert ? s.w_size - s.insert : have;
   }
   if (s.high_water < s.strstart) {
     s.high_water = s.strstart;