81 lines
2.3 KiB
C#
81 lines
2.3 KiB
C#
using System;
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using System.Text;
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using System.IO;
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using System.Collections.Generic;
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using BizHawk.Common.IOExtensions;
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namespace BizHawk.Emulation.DiscSystem.SBI
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{
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/// <summary>
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/// Loads SBI files into an internal representation.
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/// </summary>
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class LoadSBIJob : DiscJob
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{
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/// <summary>
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/// The file to be loaded
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/// </summary>
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public string IN_Path;
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/// <summary>
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/// The resulting interpreted data
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/// </summary>
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public SubQPatchData OUT_Data;
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public void Run()
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{
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using (var fs = File.OpenRead(IN_Path))
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{
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BinaryReader br = new BinaryReader(fs);
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string sig = br.ReadStringFixedAscii(4);
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if (sig != "SBI\0")
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throw new SBIParseException("Missing magic number");
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SubQPatchData ret = new SubQPatchData();
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List<short> bytes = new List<short>();
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//read records until done
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for (; ; )
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{
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//graceful end
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if (fs.Position == fs.Length)
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break;
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if (fs.Position + 4 > fs.Length) throw new SBIParseException("Broken record");
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var m = BCD2.BCDToInt(br.ReadByte());
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var s = BCD2.BCDToInt(br.ReadByte());
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var f = BCD2.BCDToInt(br.ReadByte());
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var ts = new Timestamp(m, s, f);
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ret.ABAs.Add(ts.Sector);
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int type = br.ReadByte();
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switch (type)
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{
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case 1: //Q0..Q9
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if (fs.Position + 10 > fs.Length) throw new SBIParseException("Broken record");
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for (int i = 0; i <= 9; i++) bytes.Add(br.ReadByte());
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for (int i = 10; i <= 11; i++) bytes.Add(-1);
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break;
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case 2: //Q3..Q5
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if (fs.Position + 3 > fs.Length) throw new SBIParseException("Broken record");
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for (int i = 0; i <= 2; i++) bytes.Add(-1);
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for (int i = 3; i <= 5; i++) bytes.Add(br.ReadByte());
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for (int i = 6; i <= 11; i++) bytes.Add(-1);
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break;
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case 3: //Q7..Q9
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if (fs.Position + 3 > fs.Length) throw new SBIParseException("Broken record");
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for (int i = 0; i <= 6; i++) bytes.Add(-1);
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for (int i = 7; i <= 9; i++) bytes.Add(br.ReadByte());
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for (int i = 10; i <= 11; i++) bytes.Add(-1);
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break;
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default:
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throw new SBIParseException("Broken record");
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}
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}
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ret.subq = bytes.ToArray();
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OUT_Data = ret;
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}
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}
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}
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} |