AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/CoreLibs/ROMClasses.cs

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2024-07-24 14:27:10 +08:00
using System;
namespace VirtualNes.Core
{
public enum EnumRomControlByte1 : byte
{
ROM_VMIRROR = 0x01,
ROM_SAVERAM = 0x02,
ROM_TRAINER = 0x04,
ROM_4SCREEN = 0x08,
}
public enum EnumRomControlByte2 : byte
{
ROM_VSUNISYSTEM = 0x01
}
public enum EnumRomType
{
InValid,
NES,
/// <summary> Nintendo Disk System </summary>
FDS,
NSF
}
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public class NSFHEADER
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{
byte[] ID;
byte Version;
byte TotalSong;
byte StartSong;
ushort LoadAddress;
ushort InitAddress;
ushort PlayAddress;
byte[] SongName;
byte[] ArtistName;
byte[] CopyrightName;
ushort SpeedNTSC;
byte[] BankSwitch;
ushort SpeedPAL;
byte NTSC_PALbits;
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public byte ExtraChipSelect;
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byte[] Expansion; // must be 0
public static int SizeOf()
{
return 128;
}
public static NSFHEADER GetDefault()
{
var res = new NSFHEADER();
res.ID = new byte[5];
res.SongName = new byte[32];
res.ArtistName = new byte[32];
res.CopyrightName = new byte[32];
res.BankSwitch = new byte[8];
res.Expansion = new byte[4];
return res;
}
}
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public class NESHEADER
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{
public byte[] ID;
public byte PRG_PAGE_SIZE;
public byte CHR_PAGE_SIZE;
public byte control1;
public byte control2;
public byte[] reserved;
public bool CheckValid()
{
return GetRomType() != EnumRomType.InValid;
}
public static int SizeOf()
{
return 16;
}
public EnumRomType GetRomType()
{
if (ID[0] == 'N' && ID[1] == 'E' && ID[2] == 'S' && ID[3] == 0x1A)
return EnumRomType.NES;
if (ID[0] == 'F' && ID[1] == 'D' && ID[2] == 'S' && ID[3] == 0x1A)
return EnumRomType.FDS;
if (ID[0] == 'N' && ID[1] == 'E' && ID[2] == 'S' && ID[3] == 'M')
return EnumRomType.NSF;
return EnumRomType.InValid;
}
public static NESHEADER GetDefault()
{
var res = new NESHEADER();
res.ID = new byte[4];
res.reserved = new byte[8];
return res;
}
public static NESHEADER Read(Span<byte> data)
{
var res = new NESHEADER();
res.ID = data.Slice(0, 4).ToArray();
res.PRG_PAGE_SIZE = data[4];
res.CHR_PAGE_SIZE = data[5];
res.control1 = data[6];
res.control2 = data[7];
res.reserved = data.Slice(8, 8).ToArray();
return res;
}
public byte[] DataToBytes()
{
byte[] res = new byte[16];
res[0] = ID[0];
res[1] = ID[1];
res[2] = ID[2];
res[3] = ID[3];
res[4] = PRG_PAGE_SIZE;
res[5] = CHR_PAGE_SIZE;
res[6] = control1;
res[7] = control2;
res[8] = reserved[0];
res[9] = reserved[1];
res[10] = reserved[2];
res[11] = reserved[3];
res[12] = reserved[4];
res[13] = reserved[5];
res[14] = reserved[6];
res[15] = reserved[7];
return res;
}
}
}