forked from sin365/AxibugEmuOnline
141 lines
3.6 KiB
C#
141 lines
3.6 KiB
C#
using System;
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namespace VirtualNes.Core
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{
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public enum EnumRomControlByte1 : byte
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{
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ROM_VMIRROR = 0x01,
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ROM_SAVERAM = 0x02,
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ROM_TRAINER = 0x04,
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ROM_4SCREEN = 0x08,
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}
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public enum EnumRomControlByte2 : byte
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{
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ROM_VSUNISYSTEM = 0x01
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}
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public enum EnumRomType
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{
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InValid,
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NES,
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/// <summary> Nintendo Disk System </summary>
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FDS,
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NSF
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}
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public class NSFHEADER
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{
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byte[] ID;
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byte Version;
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byte TotalSong;
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byte StartSong;
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ushort LoadAddress;
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ushort InitAddress;
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ushort PlayAddress;
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byte[] SongName;
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byte[] ArtistName;
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byte[] CopyrightName;
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ushort SpeedNTSC;
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byte[] BankSwitch;
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ushort SpeedPAL;
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byte NTSC_PALbits;
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public byte ExtraChipSelect;
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byte[] Expansion; // must be 0
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public static int SizeOf()
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{
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return 128;
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}
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public static NSFHEADER GetDefault()
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{
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var res = new NSFHEADER();
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res.ID = new byte[5];
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res.SongName = new byte[32];
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res.ArtistName = new byte[32];
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res.CopyrightName = new byte[32];
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res.BankSwitch = new byte[8];
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res.Expansion = new byte[4];
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return res;
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}
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}
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public class NESHEADER
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{
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public byte[] ID;
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public byte PRG_PAGE_SIZE;
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public byte CHR_PAGE_SIZE;
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public byte control1;
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public byte control2;
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public byte[] reserved;
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public bool CheckValid()
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{
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return GetRomType() != EnumRomType.InValid;
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}
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public static int SizeOf()
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{
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return 16;
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}
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public EnumRomType GetRomType()
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{
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if (ID[0] == 'N' && ID[1] == 'E' && ID[2] == 'S' && ID[3] == 0x1A)
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return EnumRomType.NES;
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if (ID[0] == 'F' && ID[1] == 'D' && ID[2] == 'S' && ID[3] == 0x1A)
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return EnumRomType.FDS;
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if (ID[0] == 'N' && ID[1] == 'E' && ID[2] == 'S' && ID[3] == 'M')
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return EnumRomType.NSF;
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return EnumRomType.InValid;
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}
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public static NESHEADER GetDefault()
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{
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var res = new NESHEADER();
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res.ID = new byte[4];
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res.reserved = new byte[8];
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return res;
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}
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public static NESHEADER Read(Span<byte> data)
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{
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var res = new NESHEADER();
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res.ID = data.Slice(0, 4).ToArray();
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res.PRG_PAGE_SIZE = data[4];
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res.CHR_PAGE_SIZE = data[5];
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res.control1 = data[6];
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res.control2 = data[7];
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res.reserved = data.Slice(8, 8).ToArray();
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return res;
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}
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public byte[] DataToBytes()
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{
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byte[] res = new byte[16];
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res[0] = ID[0];
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res[1] = ID[1];
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res[2] = ID[2];
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res[3] = ID[3];
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res[4] = PRG_PAGE_SIZE;
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res[5] = CHR_PAGE_SIZE;
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res[6] = control1;
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res[7] = control2;
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res[8] = reserved[0];
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res[9] = reserved[1];
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res[10] = reserved[2];
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res[11] = reserved[3];
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res[12] = reserved[4];
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res[13] = reserved[5];
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res[14] = reserved[6];
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res[15] = reserved[7];
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return res;
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}
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}
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}
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