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