Minetest World: MapBlock De-serialization Test in Version 29

mt-mapblock-deserialization-test.ipynb

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    "Minetest World: MapBlock De-serialization Test\n",
    "-------"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pyzstd"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "raw_bytes = []\n",
    "with open('mt/map-blocks-61763-data', 'rb') as f:\n",
    "\traw_bytes = f.read()"
   ]
  },
  {
   "cell_type": "code",
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    {
     "data": {
      "text/plain": [
       "29"
      ]
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     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "map_version = raw_bytes[0]\n",
    "map_version"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "data = pyzstd.decompress(raw_bytes[1:])"
   ]
  },
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   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(3, 65535, 931, 0, 14)"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "flags = int(data[0])\n",
    "lighting_complete = int.from_bytes(data[1:3], byteorder='big')\n",
    "timestamp = int.from_bytes(data[3:7], byteorder='big')\n",
    "name_id_mapping_version = int(data[7])\n",
    "num_name_id_mappings = int.from_bytes(data[8:10], byteorder='big')\n",
    "(flags, lighting_complete, timestamp, name_id_mapping_version, num_name_id_mappings)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "13 16 b'mcl_core:granite'\n",
      "0 14 b'mcl_core:stone'\n",
      "1 13 b'mcl_core:dirt'\n",
      "2 24 b'mcl_core:dirt_with_grass'\n",
      "3 3 b'air'\n",
      "4 24 b'mcl_core:stone_with_iron'\n",
      "5 21 b'mcl_flowers:dandelion'\n",
      "6 21 b'mcl_flowers:tallgrass'\n",
      "7 24 b'mcl_core:stone_with_coal'\n",
      "8 15 b'mcl_core:gravel'\n",
      "9 17 b'mcl_core:andesite'\n",
      "10 15 b'mcl_core:leaves'\n",
      "11 13 b'mcl_core:tree'\n"
     ]
    }
   ],
   "source": [
    "data_pointer = 10\n",
    "for i in range(1, num_name_id_mappings):\n",
    "\tmap_id = int.from_bytes(data[data_pointer:(data_pointer + 2)], byteorder='big')\n",
    "\tdata_pointer += 2\n",
    "\tmap_name_len = int.from_bytes(data[data_pointer:(data_pointer + 2)], byteorder='big')\n",
    "\tdata_pointer += 2\n",
    "\tmap_name = data[data_pointer:(data_pointer + map_name_len)]\n",
    "\tdata_pointer += map_name_len\n",
    "\tprint('%d %d %s' % (map_id, map_name_len, map_name))"
   ]
  }
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