Ultima.Map.RewriteMap C# (CSharp) Method

        public static void RewriteMap(string path, int map, int width, int height)
        {
            string mapPath = Files.GetFilePath("map{0}.mul", map);
            FileStream m_map;
            BinaryReader m_mapReader;
            if (mapPath != null)
            {
                m_map = new FileStream(mapPath, FileMode.Open, FileAccess.Read, FileShare.Read);
                m_mapReader = new BinaryReader(m_map);
            }
            else
                return;

            int blockx = width >> 3;
            int blocky = height >> 3;

            string mul = Path.Combine(path, String.Format("map{0}.mul", map));
            using (FileStream fsmul = new FileStream(mul, FileMode.Create, FileAccess.Write, FileShare.Write))
            {
                MemoryStream memmul = new MemoryStream();
                using (BinaryWriter binmul = new BinaryWriter(memmul))
                {
                    for (int x = 0; x < blockx; ++x)
                    {
                        for (int y = 0; y < blocky; ++y)
                        {
                            try
                            {
                                m_mapReader.BaseStream.Seek(((x * blocky) + y) * 196, SeekOrigin.Begin);
                                int header = m_mapReader.ReadInt32();
                                binmul.Write(header);
                                for (int i = 0; i < 64; ++i)
                                {
                                    short tileid = m_mapReader.ReadInt16();
                                    sbyte z = m_mapReader.ReadSByte();
                                    if ((tileid < 0) || (tileid >= 0x4000))
                                        tileid = 0;
                                    if (z < -128)
                                        z = -128;
                                    if (z > 127)
                                        z = 127;
                                    binmul.Write(tileid);
                                    binmul.Write(z);
                                }
                            }
                            catch //fill rest
                            {
                                binmul.BaseStream.Seek(((x * blocky) + y) * 196, SeekOrigin.Begin);
                                for (; x < blockx; ++x)
                                {
                                    for (; y < blocky; ++y)
                                    {
                                        binmul.Write((int)0);
                                        for (int i = 0; i < 64; ++i)
                                        {
                                            binmul.Write((short)0);
                                            binmul.Write((sbyte)0);
                                        }
                                    }
                                    y = 0;
                                }
                            }
                        }
                    }
                    memmul.WriteTo(fsmul);
                }
            }
            m_mapReader.Close();
        }