public static int GetIntermediateAddress(int offset)
{
int bank, directPage, operand, programCounter;
int opcode = Data.GetROMByte(offset);
AddressMode mode = GetAddressMode(offset);
switch (mode)
{
case AddressMode.DIRECT_PAGE:
case AddressMode.DIRECT_PAGE_X_INDEX:
case AddressMode.DIRECT_PAGE_Y_INDEX:
case AddressMode.DIRECT_PAGE_INDIRECT:
case AddressMode.DIRECT_PAGE_X_INDEX_INDIRECT:
case AddressMode.DIRECT_PAGE_INDIRECT_Y_INDEX:
case AddressMode.DIRECT_PAGE_LONG_INDIRECT:
case AddressMode.DIRECT_PAGE_LONG_INDIRECT_Y_INDEX:
directPage = Data.GetDirectPage(offset);
operand = Data.GetROMByte(offset + 1);
return((directPage + operand) & 0xFFFF);
case AddressMode.DIRECT_PAGE_S_INDEX:
case AddressMode.DIRECT_PAGE_S_INDEX_INDIRECT_Y_INDEX:
return(Data.GetROMByte(offset + 1));
case AddressMode.ADDRESS:
case AddressMode.ADDRESS_X_INDEX:
case AddressMode.ADDRESS_Y_INDEX:
case AddressMode.ADDRESS_X_INDEX_INDIRECT:
bank = (opcode == 0x20 || opcode == 0x4C || opcode == 0x7C || opcode == 0xFC) ?
Util.ConvertPCtoSNES(offset) >> 16 :
Data.GetDataBank(offset);
operand = Util.GetROMWord(offset + 1);
return((bank << 16) | operand);
case AddressMode.ADDRESS_INDIRECT:
case AddressMode.ADDRESS_LONG_INDIRECT:
operand = Util.GetROMWord(offset + 1);
return(operand);
case AddressMode.LONG:
case AddressMode.LONG_X_INDEX:
operand = Util.GetROMLong(offset + 1);
return(operand);
case AddressMode.RELATIVE_8:
programCounter = Util.ConvertPCtoSNES(offset + 2);
bank = programCounter >> 16;
offset = (sbyte)Data.GetROMByte(offset + 1);
return((bank << 16) | ((programCounter + offset) & 0xFFFF));
case AddressMode.RELATIVE_16:
programCounter = Util.ConvertPCtoSNES(offset + 3);
bank = programCounter >> 16;
offset = (short)Util.GetROMWord(offset + 1);
return((bank << 16) | ((programCounter + offset) & 0xFFFF));
}
return(-1);
}