105 lines
2.5 KiB
C#
105 lines
2.5 KiB
C#
using System;
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//disc type identification logic
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namespace BizHawk.Emulation.DiscSystem
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{
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public enum DiscType
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{
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/// <summary>
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/// Nothing is known about this disc type
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/// </summary>
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UnknownFormat,
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/// <summary>
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/// This is definitely a CDFS disc, but we can't identify anything more about it
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/// </summary>
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UnknownCDFS,
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/// <summary>
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/// Sony PSX
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/// </summary>
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SonyPSX,
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/// <summary>
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/// Sony PSP
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/// </summary>
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SonyPSP,
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/// <summary>
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/// Sega Saturn
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/// </summary>
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SegaSaturn,
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/// <summary>
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/// Its not clear whether we can ever have enough info to ID a turboCD disc (we're using hashes)
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/// </summary>
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TurboCD,
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/// <summary>
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/// MegaDrive addon
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/// </summary>
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MegaCD
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}
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sealed public partial class Disc
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{
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/// <summary>
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/// Attempts to determine the type of the disc.
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/// In the future, we might return a struct or a class with more detailed information
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/// </summary>
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public DiscType DetectDiscType()
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{
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//sega doesnt put anything identifying in the cdfs volume info. but its consistent about putting its own header here in sector 0
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if (DetectSegaSaturn()) return DiscType.SegaSaturn;
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// not fully tested yet
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if (DetectMegaCD()) return DiscType.MegaCD;
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//we dont know how to detect TurboCD.
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//an emulator frontend will likely just guess TurboCD if the disc is UnknownFormat
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var iso = new ISOFile();
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bool isIso = iso.Parse(DiscStream.Open_LBA_2048(this));
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if (isIso)
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{
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var appId = System.Text.Encoding.ASCII.GetString(iso.VolumeDescriptors[0].ApplicationIdentifier).TrimEnd('\0', ' ');
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if (appId == "PLAYSTATION")
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return DiscType.SonyPSX;
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if(appId == "PSP GAME")
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return DiscType.SonyPSP;
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return DiscType.UnknownCDFS;
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}
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return DiscType.UnknownFormat;
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}
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/// <summary>
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/// This is reasonable approach to ID saturn.
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/// </summary>
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bool DetectSegaSaturn()
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{
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return StringAt("SEGA SEGASATURN", 0);
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}
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/// <summary>
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/// probably wrong
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/// </summary>
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bool DetectMegaCD()
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{
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return StringAt("SEGADISCSYSTEM", 0) || StringAt("SEGADISCSYSTEM", 16);
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}
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private bool StringAt(string s, int n)
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{
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byte[] data = new byte[2048];
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ReadLBA_2048(0, data, 0);
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byte[] cmp = System.Text.Encoding.ASCII.GetBytes(s);
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byte[] cmp2 = new byte[cmp.Length];
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Buffer.BlockCopy(data, n, cmp2, 0, cmp.Length);
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return System.Linq.Enumerable.SequenceEqual(cmp, cmp2);
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}
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}
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} |