108 lines
2.8 KiB
C#
108 lines
2.8 KiB
C#
using System;
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using System.IO;
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using System.Linq;
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using System.Text;
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using BizHawk.Common;
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using BizHawk.Common.NumberExtensions;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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partial class NES
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{
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private static int iNES2Wram(int i)
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{
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if (i == 0) return 0;
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if (i == 15) throw new InvalidDataException();
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return 1 << (i + 6);
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}
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public static bool DetectFromINES(byte[] data, out CartInfo Cart, out CartInfo CartV2)
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{
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byte[] ID = new byte[4];
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Buffer.BlockCopy(data, 0, ID, 0, 4);
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if (!ID.SequenceEqual(Encoding.ASCII.GetBytes("NES\x1A")))
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{
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Cart = null;
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CartV2 = null;
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return false;
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}
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if ((data[7] & 0x0c) == 0x08)
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{
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// process as iNES v2
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CartV2 = new CartInfo();
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CartV2.prg_size = data[4] | data[9] << 8 & 0xf00;
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CartV2.chr_size = data[5] | data[9] << 4 & 0xf00;
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CartV2.prg_size *= 16;
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CartV2.chr_size *= 8;
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CartV2.wram_battery = (data[6] & 2) != 0; // should this be respected in v2 mode??
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int wrambat = iNES2Wram(data[10] >> 4);
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int wramnon = iNES2Wram(data[10] & 15);
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CartV2.wram_battery |= wrambat > 0;
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// fixme - doesn't handle sizes not divisible by 1024
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CartV2.wram_size = (short)((wrambat + wramnon) / 1024);
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int mapper = data[6] >> 4 | data[7] & 0xf0 | data[8] << 8 & 0xf00;
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int submapper = data[8] >> 4;
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CartV2.board_type = string.Format("MAPPER{0:d4}-{1:d2}", mapper, submapper);
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int vrambat = iNES2Wram(data[11] >> 4);
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int vramnon = iNES2Wram(data[11] & 15);
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// hopefully a game with battery backed vram understands what to do internally
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CartV2.wram_battery |= vrambat > 0;
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CartV2.vram_size = (vrambat + vramnon) / 1024;
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CartV2.inesmirroring = data[6] & 1 | data[6] >> 2 & 2;
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switch (CartV2.inesmirroring)
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{
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case 0: CartV2.pad_v = 1; break;
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case 1: CartV2.pad_h = 1; break;
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}
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}
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else
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{
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CartV2 = null;
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}
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// process as iNES v1
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// the DiskDude cleaning is no longer; get better roms
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Cart = new CartInfo();
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Cart.prg_size = data[4];
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Cart.chr_size = data[5];
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if (Cart.prg_size == 0)
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Cart.prg_size = 256;
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Cart.prg_size *= 16;
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Cart.chr_size *= 8;
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Cart.wram_battery = (data[6] & 2) != 0;
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Cart.wram_size = 8; // should be data[8], but that never worked
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{
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int mapper = data[6] >> 4 | data[7] & 0xf0;
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Cart.board_type = string.Format("MAPPER{0:d3}", mapper);
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}
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Cart.vram_size = Cart.chr_size > 0 ? 0 : 8;
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Cart.inesmirroring = data[6] & 1 | data[6] >> 2 & 2;
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switch (Cart.inesmirroring)
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{
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case 0: Cart.pad_v = 1; break;
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case 1: Cart.pad_h = 1; break;
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}
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if (data[6].Bit(2))
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Console.WriteLine("DANGER: According to the flags, this iNES has a trainer in it! We don't support this garbage.");
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return true;
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}
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}
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} |