362 lines
12 KiB
C#
362 lines
12 KiB
C#
using Codice.CM.Client.Differences;
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using System;
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using System.IO;
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using System.Linq;
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using VirtualNes.Core.Debug;
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using static UnityEditor.PlayerSettings;
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namespace VirtualNes.Core
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{
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public class ROM
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{
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protected NESHEADER header;
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protected NSFHEADER nsfheader;
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protected string path;
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protected string name;
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protected string fullpath;
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protected bool bPAL;
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protected bool bNSF;
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protected int NSF_PAGE_SIZE;
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protected byte[] lpPRG;
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protected byte[] lpCHR;
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protected byte[] lpTrainer;
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protected byte[] lpDiskBios;
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protected byte[] lpDisk;
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protected ulong crc;
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protected ulong crcall;
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protected ulong crcvrom;
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protected int mapper;
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protected int diskno;
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protected ulong fdsmakerID;
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protected ulong fdsgameID;
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public ROM(string fname)
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{
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Stream fp = null;
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byte[] temp = null;
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byte[] bios = null;
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long FileSize = 0;
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header = NESHEADER.GetDefault();
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path = string.Empty;
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name = string.Empty;
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bPAL = false;
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bNSF = false;
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NSF_PAGE_SIZE = 0;
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lpPRG = lpCHR = lpTrainer = lpDiskBios = lpDisk = null;
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crc = crcall = 0;
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mapper = 0;
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diskno = 0;
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try
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{
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fp = Supporter.OpenRom(fname);
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if (fp == null)
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{
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throw new System.Exception($"Open Rom Failed:[{fname}]");
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}
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FileSize = fp.Length;
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if (FileSize < 17)
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{
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throw new System.Exception($"File too small:[{fname}]");
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}
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temp = new byte[FileSize];
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fp.Read(temp, 0, temp.Length);
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fp.Dispose();
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header = NESHEADER.Read(temp);
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if (!header.CheckValid())
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throw new Exception($"rom file is not valid:[{fname}]");
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ulong PRGoffset, CHRoffset;
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long PRGsize = 0, CHRsize = 0;
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var romType = header.GetRomType();
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if (romType == EnumRomType.NES)
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{
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PRGsize = (long)header.PRG_PAGE_SIZE * 0x4000;
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CHRsize = (long)header.CHR_PAGE_SIZE * 0x2000;
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PRGoffset = (ulong)NESHEADER.SizeOf();
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CHRoffset = PRGoffset + (ulong)PRGsize;
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if (IsTRAINER())
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{
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PRGoffset += 512;
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CHRoffset += 512;
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}
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if (PRGsize <= 0 || (PRGsize + CHRsize) > FileSize)
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{
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throw new Exception($"Invalid NesHeader:[{fname}]");
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}
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//PRG BANK
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lpPRG = new byte[PRGsize];
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Array.Copy(temp, (int)PRGoffset, lpPRG, 0, PRGsize);
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//CHR BANK
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if (CHRsize > 0)
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{
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lpCHR = new byte[CHRsize];
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if (FileSize >= (long)CHRoffset + CHRsize)
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{
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Array.Copy(temp, (int)CHRoffset, lpCHR, 0, CHRsize);
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}
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else
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{
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//CHR Bank太少...
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CHRsize -= ((long)CHRoffset + CHRsize - FileSize);
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Array.Copy(temp, (int)CHRoffset, lpCHR, 0, CHRsize);
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}
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}
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else
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{
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lpCHR = null;
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}
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if (IsTRAINER())
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{
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lpTrainer = new byte[512];
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Array.Copy(temp, NESHEADER.SizeOf(), lpTrainer, 0, 512);
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}
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else
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{
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lpTrainer = null;
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}
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}
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else if (romType == EnumRomType.FDS)
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{
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diskno = header.PRG_PAGE_SIZE;
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if (FileSize < (16 + 65500 * diskno))
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{
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throw new Exception($"Illegal Disk Size:[{fname}]");
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}
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if (diskno > 8)
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{
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throw new Exception($"Unsupport disk:[{fname}]");
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}
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header = NESHEADER.GetDefault();
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header.ID[0] = (byte)'N';
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header.ID[1] = (byte)'E';
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header.ID[2] = (byte)'S';
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header.ID[3] = 0x1A;
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header.PRG_PAGE_SIZE = (byte)(diskno * 4);
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header.CHR_PAGE_SIZE = 0;
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header.control1 = 0x40;
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header.control2 = 0x10;
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PRGsize = NESHEADER.SizeOf() + 65500 * diskno;
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//PRG BANK
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lpPRG = new byte[PRGsize];
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lpDisk = new byte[PRGsize];
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lpCHR = null;
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var headerBuffer = header.DataToBytes();
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Array.Copy(headerBuffer, lpPRG, headerBuffer.Length);
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Array.Copy(temp, NESHEADER.SizeOf(), lpPRG, NESHEADER.SizeOf(), 65500 * diskno);
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lpPRG[0] = (byte)'F';
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lpPRG[1] = (byte)'D';
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lpPRG[2] = (byte)'S';
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lpPRG[3] = 0x1A;
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lpPRG[4] = (byte)diskno;
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fp = Supporter.OpenFile_DISKSYS();
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if (fp == null)
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{
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throw new Exception($"Not found DISKSYS.ROM for [{fname}]");
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}
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FileSize = fp.Length;
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if (FileSize < 17)
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{
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throw new Exception($"Small File Of DISKSYS.ROM");
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}
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bios = new byte[FileSize];
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fp.Read(bios, 0, (int)FileSize);
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fp.Dispose();
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lpDiskBios = new byte[8 * 1024];
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if (bios[0] == 'N' && bios[1] == 'E' && bios[2] == 'S' && bios[3] == 0x1A)
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{
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Array.Copy(bios, 0x6010, lpDiskBios, 0, lpDiskBios.Length);
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}
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else
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{
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Array.Copy(bios, lpDiskBios, lpDiskBios.Length);
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}
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bios = null;
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}
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else if (romType == EnumRomType.NSF)
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{
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bNSF = true;
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header = NESHEADER.GetDefault();
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nsfheader = NSFHEADER.GetDefault();
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PRGsize = FileSize - NSFHEADER.SizeOf();
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Debuger.Log($"PRGSIZE:{PRGsize}");
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PRGsize = (PRGsize + 0x0FFF) & ~0x0FFF;
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Debuger.Log($"PRGSIZE:{PRGsize}");
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lpPRG = new byte[PRGsize];
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Array.Copy(temp, NSFHEADER.SizeOf(), lpPRG, 0, FileSize - NSFHEADER.SizeOf());
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NSF_PAGE_SIZE = (int)(PRGsize >> 12);
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Debuger.Log($"PAGESIZE:{NSF_PAGE_SIZE}");
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}
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else
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{
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throw new Exception($"Unsupport format:[{fname}]");
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}
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Supporter.GetFilePathInfo(fname, out fullpath, out path);
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if (!bNSF)
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{
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mapper = (header.control1 >> 4) | (header.control2 & 0xF0);
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crc = crcall = crcvrom = 0;
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if (mapper != 20)
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{
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Span<byte> sTemp = temp;
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if (IsTRAINER())
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{
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crcall = CRC.CrcRev((int)(512 + PRGsize + CHRsize), sTemp.Slice(NESHEADER.SizeOf()));
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crc = CRC.CrcRev((int)(512 + PRGsize), sTemp);
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if (CHRsize > 0)
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crcvrom = CRC.CrcRev((int)CHRsize, sTemp.Slice((int)(PRGsize + 512 + NESHEADER.SizeOf())));
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}
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else
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{
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crcall = CRC.CrcRev((int)(PRGsize + CHRsize), sTemp.Slice(NESHEADER.SizeOf()));
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crc = CRC.CrcRev((int)(PRGsize), sTemp.Slice(NESHEADER.SizeOf()));
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if (CHRsize > 0)
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crcvrom = CRC.CrcRev((int)CHRsize, sTemp.Slice((int)(PRGsize + NESHEADER.SizeOf())));
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}
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FileNameCheck(fname);
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RomPatch.DoPatch(ref crc, ref lpPRG, ref lpCHR, ref mapper, ref header);
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fdsmakerID = fdsgameID = 0;
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}
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else //mapper==20
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{
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crc = crcall = crcvrom = 0;
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fdsmakerID = lpPRG[0x1F];
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fdsgameID = (ulong)((lpPRG[0x20] << 24) | (lpPRG[0x21] << 16) | (lpPRG[0x22] << 8) | (lpPRG[0x23] << 0));
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}
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}
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else //NSF
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{
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mapper = 0x0100; // Private mapper
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crc = crcall = crcvrom = 0;
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fdsmakerID = fdsgameID = 0;
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}
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temp = null;
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}
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catch (Exception ex)
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{
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fp?.Dispose();
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temp = null;
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bios = null;
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lpPRG = null;
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lpCHR = null;
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lpTrainer = null;
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lpDiskBios = null;
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lpDisk = null;
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throw ex;
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}
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}
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public void Dispose()
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{
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lpPRG = null;
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lpCHR = null;
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lpTrainer = null;
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lpDiskBios = null;
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lpDisk = null;
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}
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public bool IsTRAINER()
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{
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return (header.control1 & (byte)EnumRomControlByte1.ROM_TRAINER) > 0;
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}
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public bool IsNSF()
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{
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return bNSF;
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}
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public bool IsSAVERAM()
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{
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return (header.control1 & (byte)EnumRomControlByte1.ROM_SAVERAM) > 0;
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}
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protected void FileNameCheck(string fname)
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{
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if (fname.Contains("(E)"))
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{
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bPAL = true;
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return;
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}
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}
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internal string GetRomName()
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{
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return name;
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}
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internal int GetMapperNo()
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{
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return mapper;
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}
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internal byte[] GetPROM()
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{
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return lpPRG;
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}
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internal byte[] GetDISK()
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{
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return lpDisk;
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}
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internal int GetDiskNo()
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{
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return diskno;
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}
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internal ulong GetGameID()
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{
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return fdsgameID;
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}
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internal ulong GetMakerID()
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{
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return fdsmakerID;
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}
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internal bool IsVSUNISYSTEM()
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{
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return (header.control2 & (byte)EnumRomControlByte2.ROM_VSUNISYSTEM) != 0;
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}
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}
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}
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