AxibugEmuOnline/AxibugEmuOnline.Client/Assets/MyNes.Core/INes.cs
2024-07-03 18:22:22 +08:00

96 lines
2.5 KiB
C#

using System.IO;
using System.Security.Cryptography;
namespace MyNes.Core
{
public class INes : IRom
{
public bool HasBattery { get; private set; }
public bool IsPlaychoice10 { get; private set; }
public bool IsVSUnisystem { get; private set; }
public override void Load(string fileName, bool loadDumps)
{
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fileStream.Length < 16)
{
fileStream.Close();
base.IsValid = false;
return;
}
byte[] array = new byte[16];
fileStream.Read(array, 0, 16);
byte[] buffer = new byte[fileStream.Length - 16];
fileStream.Read(buffer, 0, (int)(fileStream.Length - 16));
base.SHA1 = "";
byte[] array2 = new SHA1Managed().ComputeHash(buffer);
foreach (byte b in array2)
{
base.SHA1 += b.ToString("x2").ToLower();
}
if (array[0] != 78 || array[1] != 69 || array[2] != 83 || array[3] != 26)
{
fileStream.Close();
base.IsValid = false;
return;
}
base.PRGCount = array[4];
base.CHRCount = array[5];
switch (array[6] & 9)
{
case 0:
base.Mirroring = Mirroring.Horz;
break;
case 1:
base.Mirroring = Mirroring.Vert;
break;
case 8:
case 9:
base.Mirroring = Mirroring.Full;
break;
}
HasBattery = (array[6] & 2) != 0;
base.HasTrainer = (array[6] & 4) != 0;
if ((array[7] & 0xF) == 0)
{
base.MapperNumber = (byte)((array[7] & 0xF0) | (array[6] >> 4));
}
else
{
base.MapperNumber = (byte)(array[6] >> 4);
}
IsVSUnisystem = (array[7] & 1) != 0;
IsPlaychoice10 = (array[7] & 2) != 0;
if (loadDumps)
{
fileStream.Seek(16L, SeekOrigin.Begin);
if (base.HasTrainer)
{
base.Trainer = new byte[512];
fileStream.Read(base.Trainer, 0, 512);
}
else
{
base.Trainer = new byte[0];
}
base.PRG = new byte[base.PRGCount * 16384];
fileStream.Read(base.PRG, 0, base.PRGCount * 16384);
if (base.CHRCount > 0)
{
base.CHR = new byte[base.CHRCount * 8192];
fileStream.Read(base.CHR, 0, base.CHRCount * 8192);
}
else
{
base.CHR = new byte[0];
}
}
base.IsValid = true;
fileStream.Dispose();
fileStream.Close();
}
}
}