code: void fillEntryTree(Set<PageLeafEntry> entries,
                       Row row)
    {
      int ptr = _rowHead;
      
      byte []buffer = _buffer;
  
      while (ptr < BLOCK_SIZE) {
        int code = buffer[ptr] & CODE_MASK;
        int len = getLength(code, row);
  
        if (code == INSERT || code == REMOVE) {
          PageLeafEntry entry = new PageLeafEntry(this, row, ptr, len, code);
          
          entries.add(entry);
        }
        
        ptr += len;
      }
    }
docs: Fills the entry tree map with entries from the block.