SnesToPC

bool HasHeader(string path)
        {
            if (!File.Exists(path)) return false;

            long size = new System.IO.FileInfo(path).Length;

            if ((size & 0x000200) != 0) return true;

            return false;
        }

        bool IsHirom(string path)
        {
            if (!File.Exists(path)) return false;
            BinaryReader reader = new BinaryReader(File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read));

            try
            {
                int o = 0x7FD5;
                if (HasHeader(path)) o += 0x200;
                reader.BaseStream.Seek(o, SeekOrigin.Begin);
                byte v = reader.ReadByte();
                reader.Close();
                if ((v & 1) == 1) return true;
                return false;
            }
            catch(Exception e)
            {
                reader.Close();
                return false;
            }
        }

        uint SNESToPC(string path, uint addr)
        {
            return SNESToPC(path, addr & 0x0000FF, (addr & 0x00FF00)/0x100, (addr & 0xFF0000) / 0x10000);
        }

        uint SNESToPC(string path, uint addrlo, uint addrhi, uint bank)
        {

            bool header = HasHeader(path);

            if (IsHirom(path))
            {
                uint addr = (addrlo) + (addrhi * 0x100) + (bank * 0x10000);
                if ((addr & 0x400000) != 0)
                {
                    addr &= 0x3FFFFF;
                }
                else
                {
                    addr = ((addr & 0x8000)!=0) ? addr & 0x3FFFFF : 0;
                }
                return addr;
            }
            else
            {
                bank &= 0x7F;
                return (uint)((addrlo & 0xFF) + (0x100 * (addrhi & 0xFF)) + (0x8000 * bank) - ((header) ? 0 : 0x200) - 0x7E00);
            }
        }

        uint SNESToPC(bool header, bool hirom, uint addr)
        {
            return SNESToPC(header, hirom, addr & 0x0000FF, (addr & 0x00FF00) / 0x100, (addr & 0xFF0000) / 0x10000);
        }

        uint SNESToPC(bool header, bool hirom, uint addrlo, uint addrhi, uint bank)
        {

            if (hirom)
            {
                uint addr = (addrlo) + (addrhi * 0x100) + (bank * 0x10000);
                if ((addr & 0x400000) != 0)
                {
                    addr &= 0x3FFFFF;
                }
                else
                {
                    addr = ((addr & 0x8000) != 0) ? addr & 0x3FFFFF : 0;
                }
                return addr;
            }
            else
            {
                bank &= 0x7F;
                return (uint)((addrlo & 0xFF) + (0x100 * (addrhi & 0xFF)) + (0x8000 * bank) - ((header) ? 0 : 0x200) - 0x7E00);
            }
        }